Stainless Steel Pipe & Tube – Product Overview

Product Category: Stainless Steel Pipe & Industrial Tubing

Material Families: Austenitic, Ferritic, Martensitic and Duplex Stainless Steels

Main Grades: 304, 304L, 316, 316L, 316Ti, 317L, 321, 321H, 347, 347H, 310S, 904L, 2205, 2507 and selected specialty grades

Manufacturing Methods: Seamless, Welded, Electric Fusion Welded, Cold Drawn and Precision Processed

Main Product Standards: ASTM A312, A358, A409, A376, A790, A928, A269, A270, A213, A249, A789, A554 and A268

Dimensional References: ASME B36.19, ASME B36.10, ISO 1127 and applicable project specifications

Pipe Sizes: NPS 1/8–24 and selected larger sizes, depending on product standard and manufacturing route

Wall Thickness: SCH 5S, 10S, 40S, 80S and applicable heavier-wall or custom dimensions

Tubing Dimensions: Specified outside diameter, wall thickness and tolerances according to the applicable tube standard

Surface Conditions: Annealed, Pickled, Bright Annealed, Mechanically Polished, Electropolished or Passivated, as specified

Inspection: Chemical Analysis, PMI, Dimensional Inspection, Mechanical Testing, Hydrostatic Testing, UT, ET and Other Applicable NDT

Documentation: Material Test Certificates, EN 10204 3.1 or Agreed 3.2 Inspection Documents, and Project-Specific Quality Records

Applications: Chemical Processing, Oil & Gas, Heat Exchangers, Power Generation, Water Treatment, Food Processing, Pharmaceutical Equipment and Industrial Fabrication

What Is Stainless Steel Pipe?

Stainless steel pipe is a hollow tubular product manufactured from corrosion-resistant alloy steel containing at least approximately 10.5% chromium.

Chromium forms a thin passive oxide layer that contributes to the material's corrosion resistance under suitable environmental conditions.

Depending on alloy composition, manufacturing method and applicable specification, stainless steel pipes can provide a combination of corrosion resistance, mechanical strength, weldability, temperature resistance and long-term service performance.

Stainless steel pipes are widely specified for industrial fluid transportation, process piping, pressure-containing systems and engineered mechanical applications.

Stainless Steel Pipe vs Stainless Steel Tube

Although the terms are frequently used interchangeably, they may describe different dimensional and specification systems.

Stainless Steel Pipe

Industrial pipe is commonly specified by nominal pipe size (NPS), outside diameter and schedule-based wall thickness.

Pipe is frequently used for process piping, fluid transportation and pressure-containing systems.

Stainless Steel Tube

Stainless steel tubing is generally specified by actual outside diameter, wall thickness and dimensional tolerances.

Tubing is commonly used in heat exchangers, condensers, instrumentation systems, sanitary installations, mechanical components and precision equipment.

The applicable manufacturing standard determines inspection requirements, mechanical properties, permissible tolerances and delivery conditions.

For engineering procurement, pipe and tube specifications should not be substituted without technical approval.

Types of Stainless Steel Pipe & Tube

1. Seamless Stainless Steel Pipe

Seamless stainless steel pipe is manufactured without a longitudinal welded joint, using suitable hot-working and subsequent finishing processes.

It is commonly selected for industrial piping systems requiring controlled material properties, specified wall thicknesses and compliance with applicable pressure-piping requirements.

Typical Standards: ASTM A312, ASTM A376, ASTM A790, EN 10216-5

Common Grades: TP304, TP304L, TP316, TP316L, TP321, TP347, TP310S and selected duplex grades

Applications:

Chemical and petrochemical piping

Process fluid transportation

High-temperature industrial services

Pressure-containing piping systems

Industrial equipment connections

Seamless construction eliminates the longitudinal weld seam, but does not automatically establish a higher allowable working pressure. Pressure ratings depend on material properties, wall thickness, temperature, applicable design code and manufacturing factors.

2. Welded Stainless Steel Pipe

Welded stainless steel pipe is produced by forming stainless steel strip, coil or plate into a tubular shape and joining the longitudinal edges using an approved welding process.

Depending on the product specification, welding processes may include TIG, plasma, laser or other qualified methods.

Post-weld heat treatment, weld bead treatment, inspection and surface finishing are determined by the applicable material standard and purchase specification.

Typical Standards: ASTM A312, ASTM A790, EN 10217-7

Common Grades: 304, 304L, 316, 316L, 321 and applicable duplex grades

Applications:

Industrial liquid transportation

Chemical processing systems

Water treatment facilities

General process piping

Industrial piping fabrication

Welded stainless steel pipe can provide an economical manufacturing solution for many applications when the specified product complies with the applicable design and inspection requirements.

3. Electric Fusion Welded Stainless Steel Pipe

Electric fusion welded (EFW) stainless steel pipe is commonly manufactured from stainless steel plate using a qualified fusion-welding process.

It is particularly relevant for selected large-diameter and engineered piping requirements.

Typical Standards: ASTM A358, ASTM A409 and ASTM A928 for applicable product types

Available Configurations:

Straight-seam welded pipe

Specified large-diameter construction

Project-specific wall thickness

Qualified welding and heat-treatment conditions

Defined inspection and radiographic requirements

For ASTM A358, the required pipe class must be specified because welding, radiographic examination and manufacturing requirements differ between classes.

Applications:

Large industrial process pipelines

Chemical plant piping

Power generation facilities

Large-diameter fluid handling

Engineered industrial piping systems

4. Duplex & Super Duplex Stainless Steel Pipe

Duplex stainless steels contain both ferritic and austenitic microstructures.

These materials combine relatively high mechanical strength with corrosion resistance that can be advantageous in selected chloride-containing environments.

Typical Standards: ASTM A790, ASTM A928, EN 10216-5 and EN 10217-7, as applicable

Common Grades:

Duplex 2304 – UNS S32304

Duplex 2205 – UNS S31803 / S32205

Super Duplex 2507 – UNS S32750

Super Duplex – UNS S32760

Applications:

Offshore process systems

Chemical processing

Desalination equipment

Water treatment facilities

Selected marine and chloride-containing environments

Duplex grade selection must account for operating temperature, chloride concentration, pH, crevice conditions, welding procedures and applicable project standards.

5. Stainless Steel Heat Exchanger Tubes

Heat exchanger tubes are designed for thermal transfer equipment in which tube dimensions, heat-transfer performance, corrosion resistance and manufacturing tolerances are critical.

Typical Standards: ASTM A213, ASTM A249 and ASTM A789 for applicable duplex tubing

Common Grades: 304L, 316L, 321, 347, 310S and selected duplex grades

Typical Configurations:

Straight heat exchanger tubes

U-bend heat exchanger tubes

Seamless heat exchanger tubing

Welded heat exchanger tubing

Precision-controlled outside diameters

Special surface and cleaning requirements

Applications:

Shell-and-tube heat exchangers

Condensers

Chemical processing equipment

Thermal power equipment

Industrial cooling systems

Tube outside diameter, wall thickness, length, straightness and U-bend geometry should be selected according to the approved exchanger design.

6. Stainless Steel Instrumentation Tubing

Instrumentation tubing is used in fluid control, measurement and precision fluid-handling systems.

It normally requires controlled outside-diameter tolerances, consistent wall thickness, suitable cleanliness and compatibility with the selected fittings.

Typical Standard: ASTM A269 for applicable austenitic instrumentation tubing

Common Grades: TP304, TP304L, TP316 and TP316L

Typical Requirements:

Precision outside diameter

Controlled wall thickness

Straight or coiled supply

Suitable internal surface condition

Material traceability

Compatible compression fittings

Applications:

Instrument air systems

Chemical injection systems

Analytical equipment

Hydraulic and pneumatic control systems

Industrial measurement lines

For pressure-containing instrumentation installations, the complete tubing-and-fitting assembly must be evaluated according to the system manufacturer's technical requirements.

7. Sanitary & Hygienic Stainless Steel Tubing

Sanitary stainless steel tubing is manufactured for installations requiring controlled internal surface conditions and appropriate hygienic design.

Typical Standards: ASTM A270 and EN 10357, as applicable

Common Grades: 304, 304L, 316L and other grades permitted by the selected specification

Surface Options:

Mechanically polished internal surfaces

Electropolished surfaces

Specified internal roughness

Controlled weld-bead condition

Cleaned and protected tube ends

Applications:

Food processing equipment

Beverage manufacturing

Dairy processing

Pharmaceutical process equipment

Hygienic fluid-transfer systems

The required surface roughness, weld condition, cleanliness and hygienic documentation must be specified by the purchaser. Material-grade compliance alone does not establish hygienic system suitability.

8. Stainless Steel Boiler & High-Temperature Tubes

High-temperature stainless steel tubing is used in equipment exposed to elevated temperatures and thermal cycling.

Typical Standards: ASTM A213, ASTM A249 and ASTM A376 for applicable pipe applications

Common Grades: 304H, 316H, 321H, 347H, 310S and other specified heat-resistant grades

Applications:

Boilers and superheaters

Power generation equipment

Thermal processing systems

Refinery equipment

Industrial heating systems

High-temperature material selection requires evaluation of allowable stress, oxidation resistance, creep behavior, operating temperature and applicable design-code requirements.

9. Precision Stainless Steel Tubes

Precision stainless steel tubing is used where dimensional accuracy, surface quality and consistent product geometry are essential.

Products may be manufactured by cold drawing or other suitable precision-processing methods.

Typical Options:

Small-diameter precision tubing

Capillary tubing

Thin-wall stainless steel tubing

Cold-drawn seamless tubing

Precision-cut straight lengths

Custom mechanical tubing

Applications:

Measurement instruments

Industrial automation

Precision equipment

Mechanical assemblies

Specialized fluid-handling components

Actual dimensions, minimum wall thickness and tolerances must be agreed before manufacturing.

10. Stainless Steel Square & Rectangular Tubing

Square and rectangular stainless steel tubes are widely used for structural fabrication, equipment frames, architectural components and mechanical assemblies.

Typical Standard: ASTM A554 for applicable welded mechanical tubing

Common Grades: 201, 304, 304L, 316, 316L and selected ferritic grades

Available Shapes:

Square stainless steel tube

Rectangular stainless steel tube

Round mechanical tubing

Custom shaped stainless steel tubing

Applications:

Industrial equipment frames

Machinery manufacturing

Architectural structures

Handrails and balustrades

Commercial fabrication

Mechanical tubing must not be assumed to meet pressure-piping requirements without verification against a suitable specification.

11. Polished Stainless Steel Tubing

Polished stainless steel tubing is used where appearance, cleanability and specified surface quality are important.

Available Finishes:

Satin finish

Brushed finish

Hairline finish

Mechanically polished finish

Mirror finish

Specified internal polishing

Applications:

Architectural components

Railings and handrails

Food-processing equipment

Decorative metal fabrication

Equipment housings

Surface appearance and roughness requirements should be agreed using finish samples or measurable specifications.

12. Large-Diameter & Heavy-Wall Stainless Steel Pipe

Large-diameter and heavy-wall stainless steel pipes are used in engineered industrial projects requiring specific dimensions, mechanical properties and manufacturing procedures.

Typical Standards: ASTM A312, ASTM A358, ASTM A409, ASTM A790 and ASTM A928, where applicable

Available Configurations:

Large-diameter welded pipe

EFW stainless steel pipe

Heavy-wall seamless pipe

Custom wall thickness

Project-specific cut lengths

Special end preparation

Manufacturing feasibility, weld configuration, dimensional tolerances and inspection requirements should be reviewed against the complete project specification.

Stainless Steel Pipe Grades & Material Selection

Different stainless steel grades provide different combinations of corrosion resistance, strength, fabricability and elevated-temperature performance.

Grade	UNS Designation	Material Characteristics	Typical Selection Considerations
304	S30400	General-purpose austenitic stainless steel	General industrial piping in compatible environments
304L	S30403	Low-carbon 304 variant	Welded fabrication and reduced sensitization risk
316	S31600	Molybdenum-containing austenitic stainless steel	Improved localized corrosion resistance relative to 304 in many environments
316L	S31603	Low-carbon molybdenum-bearing grade	Welded chemical and industrial piping
316Ti	S31635	Titanium-stabilized 316 grade	Selected elevated-temperature applications
317L	S31703	Higher molybdenum content than 316L	Selected chemical-processing environments
321	S32100	Titanium-stabilized austenitic grade	High-temperature piping and fabricated equipment
321H	S32109	Higher-carbon 321 variant	Specified elevated-temperature service
347	S34700	Niobium-stabilized austenitic grade	High-temperature process systems
347H	S34709	Higher-carbon 347 variant	Elevated-temperature design applications
310S	S31008	High-chromium, high-nickel alloy	Selected high-temperature and oxidation-resistant applications
904L	N08904	High-alloy austenitic stainless steel	Selected aggressive chemical environments
254 SMO	S31254	High-molybdenum austenitic stainless steel	Severe localized-corrosion applications subject to evaluation
Duplex 2205	S32205 / S31803	Duplex structure and relatively high strength	Chemical and chloride-containing environments
Super Duplex 2507	S32750	Highly alloyed duplex grade	Demanding chloride-containing environments

Additional grades, including ferritic and martensitic stainless steels, may be considered for mechanical, heat-transfer and special-purpose tubing according to the relevant product standards.

How to Choose the Right Stainless Steel Grade

304 vs 316 Stainless Steel

304 is commonly selected for general industrial environments, while 316 contains molybdenum and generally provides improved resistance to localized chloride corrosion.

Neither grade is universally suitable for all chloride concentrations, temperatures or chemical conditions.

304L vs 316L Stainless Steel

Both are low-carbon austenitic grades commonly used in welded fabrication.

316L may offer improved corrosion resistance where molybdenum provides a practical advantage, but the actual service environment must be evaluated.

316L vs Duplex 2205

Duplex 2205 typically provides higher strength than conventional annealed 316L and can offer improved resistance to selected forms of localized corrosion and chloride stress-corrosion cracking.

However, material selection must account for temperature limitations, fabrication requirements and operating conditions.

316L vs Super Duplex 2507

Super duplex grades may be considered for more demanding chloride-containing applications.

Their suitability depends on the complete operating environment, including chloride concentration, temperature, oxygen conditions, pH and crevice geometry.

321 vs 347 Stainless Steel

Both are stabilized austenitic stainless steels used in selected elevated-temperature applications.

The preferred grade depends on the required design temperature, material properties, fabrication route and project specification.

Stainless Steel Pipe Standards & Specifications

Selecting the correct standard is essential for achieving the required mechanical properties, dimensions, manufacturing quality and inspection documentation.

 

Standard	Product Scope	Typical Applications
ASTM A312 / ASME SA312	Seamless, welded and heavily cold-worked austenitic stainless steel pipe	General corrosive and high-temperature piping service
ASTM A358 / ASME SA358	Electric-fusion-welded austenitic stainless steel pipe	Industrial and high-temperature piping
ASTM A409	Welded large-diameter austenitic steel pipe	Corrosive and high-temperature service
ASTM A376	Seamless austenitic steel pipe	High-temperature central-station service
ASTM A790 / ASME SA790	Seamless and welded duplex stainless steel pipe	Duplex industrial piping
ASTM A928	Electric-fusion-welded duplex stainless steel pipe with filler metal	Engineered duplex piping
ASTM A269	Seamless and welded austenitic stainless steel tubing	General-service and instrumentation tubing
ASTM A270	Seamless and welded stainless steel sanitary tubing	Hygienic processing equipment
ASTM A213	Seamless alloy-steel and stainless steel boiler and heat-exchanger tubes	Heat-transfer equipment
ASTM A249	Welded austenitic steel heat-exchanger and condenser tubes	Heat exchangers and condensers
ASTM A789	Seamless and welded duplex stainless steel tubing	Duplex tubular applications
ASTM A554	Welded stainless steel mechanical tubing	Mechanical and architectural applications
ASTM A268	Seamless and welded ferritic and martensitic stainless steel tubing	General-service tubing
EN 10216-5	Seamless stainless steel tubes for pressure purposes	European pressure equipment
EN 10217-7	Welded stainless steel tubes for pressure purposes	European pressure equipment
EN 10357	Longitudinally welded stainless steel tubes for food and chemical industries	Hygienic and industrial processing

Material Standards vs Dimensional Standards

Material standards establish applicable manufacturing, chemical composition, mechanical-property and inspection requirements.

Dimensional standards specify standardized outside diameters, wall thicknesses and other relevant dimensions.

Common dimensional references include:

ASME B36.19 – Stainless steel pipe dimensions

ASME B36.10 – Welded and seamless wrought steel pipe dimensions

ISO 1127 – Stainless steel tube dimensions, tolerances and conventional masses

Applicable EN or customer-approved dimensional specifications

For engineered pressure-piping systems, design requirements may additionally involve ASME B31.3 or another applicable construction code.

Important: Compliance with an ASTM material specification does not independently establish the permissible operating pressure of a completed piping system.

Stainless Steel Pipe Sizes & Wall Thickness

Stainless steel pipe dimensions are commonly specified using nominal pipe size, outside diameter and schedule designation.

ASME B36.19 provides standard dimensional references for stainless steel pipe, including SCH 5S, 10S, 40S and 80S.

Stainless Steel Pipe Size Chart

The following table provides common nominal dimensions for preliminary size selection.

All dimensions are in millimeters unless otherwise stated.

 

NPS	DN	Outside Diameter	SCH 5S	SCH 10S	SCH 40S	SCH 80S
1/2"	DN15	21.34	1.65	2.11	2.77	3.73
3/4"	DN20	26.67	1.65	2.11	2.87	3.91
1"	DN25	33.4	1.65	2.77	3.38	4.55
1-1/2"	DN40	48.26	1.65	2.77	3.68	5.08
2"	DN50	60.33	1.65	2.77	3.91	5.54
3"	DN80	88.9	2.11	3.05	5.49	7.62
4"	DN100	114.3	2.11	3.05	6.02	8.56
6"	DN150	168.28	2.77	3.4	7.11	10.97
8"	DN200	219.08	2.77	3.76	8.18	12.7

Note: This is a selected dimensional reference, not a complete manufacturing or stock list. Nominal values, rounding, tolerances and schedule availability must be verified against the specified edition of the applicable dimensional standard.

Understanding Pipe Schedule

Pipe schedule identifies a standardized nominal wall-thickness series for a given nominal pipe size.

SCH 5S

A relatively thin-wall stainless steel pipe schedule used in selected applications where engineering requirements permit.

SCH 10S

Commonly specified for selected welded stainless steel piping systems.

SCH 40S

A standard wall-thickness designation used in many industrial piping applications.

SCH 80S

A heavier wall-thickness designation used where the piping design requires additional nominal wall thickness.

Heavy-Wall & Custom Thickness

Other specified wall thicknesses may be required for industrial projects involving elevated design pressure, corrosion allowances or mechanical loading.

The schedule designation alone does not determine pipe pressure rating.

How to Calculate Pipe Inside Diameter

For a plain circular tube:

Inside Diameter (ID) = Outside Diameter (OD) − 2 × Wall Thickness (WT)

Example:

For NPS 2 stainless steel pipe with an outside diameter of 60.33 mm and SCH 40S nominal wall thickness of 3.91 mm:

ID = 60.33 − (2 × 3.91)

Nominal ID = 52.51 mm

The actual inside diameter varies with the applicable outside-diameter and wall-thickness tolerances.

 

Seamless vs Welded Stainless Steel Pipe

Both seamless and welded stainless steel pipes are used in industrial systems.

The correct choice depends on the applicable standard, design requirements, available dimensions, inspection requirements and project economics.

Comparison	Seamless Stainless Steel Pipe	Welded Stainless Steel Pipe
Manufacturing	Produced without a longitudinal weld	Produced with a longitudinal welded joint
Main Standards	ASTM A312, A376, A790	ASTM A312, A358, A409, A790 and others
Weld Seam	No longitudinal weld	Weld configuration depends on process
Size Availability	Depends on seamless production capability	Can offer advantages for selected large diameters
Inspection	According to applicable material specification	Includes applicable weld-related requirements
Wall Thickness	Standard or specified heavy-wall configurations	Standard or engineered configurations
Pressure Applications	Subject to applicable design code	Subject to applicable design code and weld factors
Procurement Consideration	Manufacturing availability and dimensional requirements	Weld quality, inspection class and manufacturing economics

Neither manufacturing method should be selected solely from a generalized claim that one is always stronger or more corrosion-resistant.

The specified grade, product standard, weld condition, design code, operating environment and testing requirements determine suitability.

Stainless Steel Pipe Surface Finishes

Surface condition affects appearance, corrosion performance, cleanability and compatibility with subsequent fabrication processes.

Annealed & Pickled

Commonly used for industrial piping where appropriate heat treatment and surface oxide removal are required.

Bright Annealed

A controlled-atmosphere heat-treatment condition that can provide a relatively bright surface.

Mechanically Polished

Used for applications requiring a specified appearance or measured surface roughness.

Electropolished

An electrochemical finishing process used where suitable surface characteristics are required for selected hygienic and precision applications.

Passivated

A specified chemical treatment intended to improve surface cleanliness and support formation of an appropriate passive surface.

Surface finishing does not compensate for incorrect alloy selection in an aggressive service environment.

Stainless Steel Pipe End Types & Processing

Pipe-end preparation should be selected according to the joining method and project specification.

Plain End (PE)

Square-cut or otherwise specified pipe ends for fabrication, joining or subsequent processing.

Beveled End (BE)

Prepared weld ends for applicable butt-welded piping connections.

Threaded End

Threaded configurations for approved fittings and suitable wall thicknesses.

Grooved End

Specified groove geometry for compatible mechanical coupling systems.

Custom Cutting

Project-specific lengths and dimensional requirements.

Additional Processing

Depending on the material and manufacturing route, processing may include bending, polishing, end preparation, cleaning, marking and customized packaging.

Industrial Applications of Stainless Steel Pipes

Oil & Gas Industry

Stainless steel pipes are used in selected refinery, petrochemical and process-fluid systems where corrosion resistance, temperature capability and documented material properties are required.

Material selection depends on the process fluid, pressure, operating temperature and applicable piping code.

Chemical & Petrochemical Processing

Stainless steel piping is used in chemical-transfer lines, process equipment and industrial fluid-handling systems.

Grades such as 316L, 317L, 904L and duplex stainless steels may be considered where compatible with the chemical environment.

Heat Exchangers & Condensers

Seamless and welded stainless steel tubes are used for heat-transfer equipment requiring specified dimensional accuracy, corrosion resistance and thermal performance.

Power Generation

Heat-resistant stainless steel pipes and tubes are used in selected boiler, superheater and thermal-processing applications.

Water Treatment & Desalination

Stainless steel piping may be used in water-treatment equipment, filtration systems and selected desalination installations.

For aggressive chloride-containing or seawater environments, material selection must be supported by appropriate engineering assessment.

Food & Beverage Processing

Sanitary stainless steel tubes are used for hygienic processing, fluid transfer and equipment manufacturing.

Specified internal roughness, cleaning procedures, weld condition and documentation are essential.

Pharmaceutical & High-Purity Processing

Stainless steel tubing may be used in controlled processing systems requiring documented cleanliness and surface conditions.

The specific hygienic or high-purity standard should be defined by the system designer.

Marine & Offshore Engineering

Duplex and other corrosion-resistant stainless steel pipes may be selected for offshore and marine applications.

Exposure to seawater, splash zones, crevices and elevated temperatures must be evaluated before material approval.

Industrial Fabrication & OEM Equipment

Round, square, rectangular and precision stainless steel tubes are used in machine frames, equipment assemblies, mechanical components and engineered fabrication projects.

Stainless Steel Pipe Manufacturing & Quality Control

Industrial stainless steel pipe procurement requires more than confirmation of the nominal grade and dimensions.

The manufacturing and quality-control plan should establish how the material will be verified against the purchase specification.

Material Identification & Traceability

Raw material certificates and heat identification should be controlled according to the applicable manufacturing and inspection requirements.

Traceability should be maintained through relevant production, inspection and delivery stages.

Manufacturing Process Control

Applicable production stages may include:

Raw material preparation and identification.

Seamless forming or tube forming and welding.

Heat treatment where required.

Sizing and dimensional correction.

Surface cleaning and finishing.

Nondestructive examination where required.

Mechanical and chemical verification.

Final dimensional inspection.

Product marking and traceability verification.

Packaging and shipment preparation.

The actual production sequence depends on the pipe type and governing specification.

Inspection & Testing

Inspection requirements may include:

Chemical Composition Analysis

Verification of specified alloy composition using approved testing methods.

Positive Material Identification (PMI)

Alloy identification using suitable analytical equipment and procedures.

PMI does not replace the complete chemical analysis required by a material specification.

Tensile Testing

Verification of tensile properties against the applicable material standard.

Hydrostatic Testing

Pressure testing where required by the governing specification or purchase agreement.

Ultrasonic Testing (UT)

Nondestructive examination for specified discontinuities under an approved testing procedure.

Eddy Current Testing (ET)

Electromagnetic inspection of suitable tubular products according to the applicable standard and acceptance criteria.

Weld Examination

Inspection of welded pipe using the applicable visual, radiographic or other required examination methods.

Dimensional Inspection

Verification of outside diameter, wall thickness, length, ovality, straightness and other specified characteristics.

Surface Inspection

Assessment of visible surface condition and specified finish requirements.

Third-Party Inspection

Independent inspection arrangements may be coordinated where required by the purchase order.

Material Test Certificates

Inspection documents may include:

EN 10204 Type 3.1 material inspection certificates.

EN 10204 Type 3.2 inspection certificates where specifically arranged.

Chemical analysis results.

Mechanical test results.

Applicable NDT reports.

Dimensional inspection records.

Heat-number and material traceability information.

The certificate type and inspection scope must be agreed before production or shipment.

Packaging & International Shipping

Export packaging should protect stainless steel pipes against transport damage, contamination and unnecessary surface contact.

Packaging solutions may include:

Protective Pipe Bundles

Suitable bundling and separation arrangements for industrial pipe shipments.

Wooden Cases

Protective cases for precision tubing, small-diameter products and selected high-value materials.

End Protection

Plastic caps or other suitable protection for pipe ends and internal surfaces.

Waterproof Protection

Appropriate wrapping and moisture-control measures according to shipping conditions.

Identification & Marking

Product identification may include grade, specification, size, heat number, quantity and agreed shipping marks.

Packaging methods should be confirmed according to the pipe dimensions, surface finish, shipment mode and destination requirements.

Why Choose Xi'an Dongmeng Group Co., Ltd.?

Comprehensive Material Selection

We support procurement involving common austenitic stainless steel grades, duplex alloys and selected specialty materials.

Multiple Product Standards

Our supply solutions cover industrial pipes and tubing specified to recognized ASTM, ASME, EN and other applicable standards.

Engineering-Oriented Procurement Support

Material grade, pipe schedule, dimensional tolerances and inspection requirements can be reviewed against project specifications.

Customized Processing

Cut lengths, selected surface finishes, end preparations and project-specific manufacturing requirements can be discussed during quotation.

Quality Documentation

Material certification, traceability information and applicable inspection records can be specified as part of the purchase requirements.

Global B2B Export Service

We work with distributors, industrial buyers, equipment manufacturers and project procurement teams requiring coordinated international supply.

Stainless Steel Pipe FAQ

1. What is the difference between stainless steel pipe and stainless steel tube?

Pipe is commonly specified by nominal pipe size and schedule-based wall thickness, while tubing is generally specified by actual outside diameter, wall thickness and dimensional tolerances. The applicable product standard determines the final requirements.

2. What is the difference between 304 and 316 stainless steel pipe?

316 contains molybdenum, which generally improves resistance to localized chloride corrosion compared with 304. Actual suitability depends on chloride concentration, temperature, pH and operating conditions.

3. Is seamless stainless steel pipe better than welded pipe?

Not necessarily. Both products can meet demanding industrial requirements when manufactured, inspected and selected according to appropriate standards. The choice depends on the design and operating conditions.

4. What are the common stainless steel pipe schedules?

Common stainless steel pipe schedule designations include SCH 5S, SCH 10S, SCH 40S and SCH 80S under ASME B36.19. Other wall-thickness systems may apply under different dimensional standards.

5. What is ASTM A312 stainless steel pipe?

ASTM A312 specifies seamless, welded and heavily cold-worked austenitic stainless steel pipe for high-temperature and general corrosive service.

6. Which stainless steel pipe is suitable for seawater?

Material selection depends on the seawater conditions, temperature, flow, biological fouling, crevice geometry and system design. Duplex, super duplex or higher-alloy stainless steels may be evaluated, but no grade should be approved solely because it is described as marine grade.

7. What is the difference between ASTM A312 and ASTM A269?

ASTM A312 covers specified austenitic stainless steel pipe products, while ASTM A269 covers seamless and welded austenitic stainless steel tubing for general service. They have different product scopes and inspection requirements.

8. What is the difference between SCH 40 and SCH 40S?

SCH 40 and SCH 40S refer to dimensional schedules associated with different standards. Some sizes share nominal wall thicknesses, while others differ. The applicable dimensional standard must be stated in the purchase order.

9. Can stainless steel pipes be supplied with custom lengths and finishes?

Custom cutting, finishing and end preparation may be available depending on the material grade, pipe size, manufacturing route and production requirements.

10. What information is required for a stainless steel pipe quotation?

A complete request should specify material grade, governing standard, size, wall thickness, manufacturing method, quantity, required length, surface condition, inspection documentation and delivery destination.

Request a Stainless Steel Pipe & Tube Quotation

Xi'an Dongmeng Group Co., Ltd. provides stainless steel pipe and tube supply solutions for international distributors, EPC contractors, equipment manufacturers and industrial procurement projects.

For accurate technical evaluation and quotation, please provide:

Material Grade: 304L / 316L / 321 / 347H / 2205 / 2507 / Other

Product Standard: ASTM A312 / A358 / A790 / A269 / A270 / Other

Pipe or Tube Size: NPS, DN or Actual Outside Diameter

Wall Thickness: Schedule or Specified Thickness

Manufacturing Method: Seamless / Welded / EFW / Other

Length & Quantity: Required Dimensions and Order Volume

Inspection: MTC, PMI, Hydrostatic Test, NDT or Third-Party Inspection

Delivery: Destination Country, Port and Required Delivery Terms

Contact Xi'an Dongmeng Group Co., Ltd.

Email: office@dongmjd.com

Phone / WhatsApp: +86 157 6921 4734

Office: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China.

Request a Quote | Submit Your Project Specification | Request Technical Data | Discuss Custom Manufacturing

 

Xi'an Dongmeng Group Co., Ltd. is one of the leading stainless steel pipe manufacturers and suppliers in China. We warmly welcome you to buy or wholesale cheap stainless steel pipe in stock here from our factory. All customized products are with high quality and competitive price. For free sample, contact us now.

440C Stainless Steel