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Xi'an Dongmeng Group Co., Ltd. supplies ASTM A358 Grade 304 / UNS S30400 electric-fusion-welded stainless steel pipe for industrial piping systems requiring large diameters, project-specific wall thicknesses, controlled weld quality and documented inspection.
ASTM A358/A358M covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe for corrosive service, high-temperature service and general industrial applications. Depending on the project specification, pipe can be ordered as Class 1, Class 2, Class 3, Class 4 or Class 5, with the class defining the welding configuration and radiographic examination requirement rather than a different material strength grade.
For quotation, send us the required grade, A358 class, outside diameter, wall thickness, length, end preparation, heat-treatment requirement, NDT requirement and applicable ASME/project specification.
Request ASTM A358 TP304 Quote → Send OD × WT × Length × Class
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ASTM A358 TP304 Quick Procurement Specifications
| Item | Supply Information |
| Product | Electric-Fusion-Welded Stainless Steel Pipe |
| ASTM Specification | ASTM A358 / A358M |
| Grade | 304 |
| Common Search Designation | TP304 |
| UNS | S30400 |
| Material Family | Austenitic Stainless Steel |
| Base Plate | ASTM A240 / A240M Type 304 |
| Welding | EFW, full-penetration butt weld |
| Classes | Class 1 / 2 / 3 / 4 / 5 |
| Dimensions | OD × nominal wall thickness according to PO |
| Wall | Schedule or custom wall thickness |
| Length | Random or specified length |
| End | Plain end / beveled end / project-specific |
| Heat Treatment | According to ASTM A358 specified condition |
| Surface | Annealed & pickled / cleaned / project-specific |
| Testing | Tension, guided-bend weld and hydrostatic testing as applicable |
| NDT | Radiography according to selected A358 Class |
| Inspection | Visual, dimensional, PMI and additional NDT by agreement |
| Documents | MTC / EN 10204 3.1, inspection reports and project documents |
| Processing | Cutting, beveling and project-specific fabrication |
| Third-Party Inspection | Available by agreement |
ASTM A358 requires the purchaser to define important ordering information including quantity, grade, class, OD, nominal wall thickness, length, end finish, special requirements, applicable ASME Code and certification requirements.
What Is ASTM A358 Grade 304 Pipe?
ASTM A358 Grade 304 is an EFW austenitic stainless steel pipe fabricated from stainless steel plate, rather than a generic ERW tube.
The steel plate used to manufacture the pipe is specified through ASTM A240/A240M, while the pipe must also comply with the applicable general requirements of ASTM A999/A999M unless ASTM A358 specifies otherwise.
Grade 304 provides a practical balance of:
Corrosion resistance in many industrial environments · weldability · ductility · fabrication capability · high-temperature oxidation resistance · widely available raw material.
It is commonly selected for industrial process piping where chloride exposure is moderate and the additional molybdenum resistance of 316/316L is not required.
ASTM A358 Class 1 vs Class 2 vs Class 3 vs Class 4 vs Class 5
Selecting the correct A358 Class is one of the most important purchasing decisions.
| Class | Welding Configuration | Filler Metal | Radiographic Examination |
| Class 1 | Double welded | Filler metal in all passes | Complete radiography |
| Class 2 | Double welded | Filler metal in all passes | No radiography required by the base Class requirement |
| Class 3 | Single welded | Filler metal in all passes | Complete radiography |
| Class 4 | Single welded | Inside/root pass may be made without filler metal under specified conditions | Complete radiography |
| Class 5 | Double welded | Filler metal | Spot radiography |
These Classes do not represent increasing mechanical strength from Class 1 to Class 5. They primarily define welding construction and radiographic inspection requirements.
Which A358 Class Should You Choose?
Class 1 is appropriate when the project requires double-welded construction combined with complete radiographic examination.
Class 2 may be specified when double welding is required but full RT is not required by the purchasing specification.
Class 3 and Class 4 apply to single-welded construction, with Class 4 allowing a defined internal weld pass without added filler metal.
Class 5 combines double-welded construction with spot radiography.
The final selection should follow the piping design specification, applicable pressure code, engineering company requirements and end-user inspection plan.
Material and Welding Requirements
ASTM A358 pipe is manufactured from plate conforming to an applicable grade under ASTM A240/A240M.
For Grade 304, the UNS designation is S30400.
The longitudinal joint is produced as a full-penetration butt weld using fusion welding procedures. ASTM A358 references welding requirements associated with the ASME Boiler and Pressure Vessel Code Section IX and applicable AWS filler-metal specifications.
For ASTM A358 Grade 304, compatible filler metal selections commonly include the 308 family where permitted by the applicable welding procedure and project specification. The actual filler metal, WPS and PQR should be verified against the purchase specification.
ASTM A358 Grade 304 Chemical Composition
Because ASTM A358 pipe is fabricated from ASTM A240 plate, chemistry should be evaluated according to the applicable ASTM A240 Type 304 / UNS S30400 requirements rather than copying an ASTM A312 pipe chemistry table.
| Element | ASTM A240 Type 304 Reference |
| Carbon, C | ≤ 0.07% |
| Manganese, Mn | ≤ 2.00% |
| Silicon, Si | ≤ 0.75% |
| Phosphorus, P | ≤ 0.045% |
| Sulfur, S | ≤ 0.030% |
| Chromium, Cr | 17.5–19.5% |
| Nickel, Ni | 8.0–10.5% |
| Nitrogen, N | ≤ 0.10% |
Important: Contract chemistry should always be checked against the ASTM A240/A240M edition specified in the purchase order and the actual Mill Test Certificate.
Mechanical Properties of Type 304 Base Material
Typical ASTM A240 requirements for annealed Type 304 include:
| Property | Requirement |
| Tensile Strength | ≥ 515 MPa |
| 0.2% Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | Approx. ≤ 92 HRB / 200 HBW |
These values describe the applicable Type 304 base material requirements. Finished ASTM A358 pipe must additionally satisfy the applicable pipe, weld and testing requirements specified by ASTM A358/A999 and the purchase order.
Heat Treatment
Unless an alternative condition is specifically ordered, ASTM A358 pipe is supplied in the heat-treated condition required by the applicable standard.
Heat treatment is important for restoring an appropriate austenitic microstructure after fabrication and for controlling corrosion-related performance around welded regions.
If a purchaser requires a special heat-treatment condition, reduced final heat-treatment temperature or no final pipe heat treatment, this must be clearly identified in the purchase order together with the corresponding marking and project requirements.
Inspection and Testing
Finished ASTM A358 pipe is subject to important mechanical and pressure-integrity testing.
The standard includes requirements for:
Transverse tension testing
Used to verify weld-joint tensile performance.
Transverse guided-bend weld testing
Used to evaluate weld soundness and ductility.
Hydrostatic testing
Used to verify pressure integrity of the finished pipe.
Radiographic testing
RT requirements depend on whether Class 1, 2, 3, 4 or 5 is specified.
Additional project inspection can include PMI, dimensional inspection, surface inspection, penetrant testing, additional radiography, ultrasonic examination or third-party inspection when specified in the purchase order.
Available Quality Documentation
MTC / Mill Test Certificate
EN 10204 3.1 documentation
Chemical analysis
Mechanical test report
Hydrostatic test report
Radiographic examination report when required
Heat-treatment record
Dimensional inspection report
PMI report when specified
Third-party inspection documentation when requested
ASTM A358 TP304 Dimensions
ASTM A358 purchasing requirements identify pipe size by outside diameter and nominal wall thickness. The buyer should therefore specify the actual OD × WT rather than relying only on a generic Schedule designation.
Dongmeng can evaluate both standard Schedule dimensions and project-specific large-diameter configurations.
Typical enquiry format:
OD × Wall Thickness × Length
Example:
610 mm OD × 8 mm WT × 6000 mm Length - ASTM A358 Grade 304 Class 1
Where applicable, dimensions may be coordinated with ASME B36.19M or ASME B36.10M, while non-standard OD and wall combinations can be evaluated according to manufacturing and project requirements.
For large-diameter or heavy-wall projects, send the required drawing or piping material specification before ordering.
ASTM A358 TP304 vs ASTM A312 TP304
These specifications should not be treated as interchangeable.
| Item | ASTM A358 Grade 304 | ASTM A312 TP304 |
| Main Product Type | EFW welded pipe | Seamless, welded or heavily cold-worked welded pipe |
| Raw Material Route | ASTM A240 plate | Pipe manufacturing route under A312 |
| Filler Metal | Used in A358 welding according to Class/process | Different welding requirements |
| Class 1–5 | Yes | No |
| Radiography by Class | Yes | No A358-style Class system |
| Typical Procurement Focus | Large-diameter/project EFW piping | General stainless process piping |
| Custom Large Diameter | Major advantage | More dependent on manufacturing route |
Choose the specification required by the piping design code and project specification rather than selecting only by diameter or price.
Where ASTM A358 Grade 304 Works Well
Grade 304 is commonly considered for industrial environments involving:
Chemical and process piping with moderate corrosion exposure
Power-generation auxiliary piping
Industrial water systems
Pulp and paper equipment
General refinery and petrochemical utility lines
Heat-transfer and process systems
Food and beverage utility piping where project hygiene requirements are separately specified
Large-diameter plant piping
High-temperature industrial service within applicable design limits
For pressure-critical installations, operating pressure, temperature, design code, corrosion allowance, weld efficiency and inspection class must be evaluated by the responsible piping engineer.
Where 304 May Not Be the Best Choice
A technically useful product page should also explain where not to use Grade 304.
Chloride-Rich Environments
304 does not contain the molybdenum addition used in 316/316L. In chloride-containing service, particularly where temperature, concentration or stagnant conditions increase, susceptibility to pitting and crevice corrosion must be evaluated.
Consider 316L or a higher-alloy material when chloride exposure is significant.
Seawater and Marine Process Systems
Do not automatically specify 304 for continuous seawater exposure.
Depending on temperature, chloride concentration and design conditions, duplex, super duplex or higher-alloy stainless steel may be required.
Aggressive Chemical Media
"Stainless steel" does not mean resistance to every acid or chemical.
Specify:
Chemical / medium
Concentration
Operating temperature
Pressure
Chloride level
pH
Continuous or intermittent exposure
Our material team can then compare 304 with 316L, 904L, duplex stainless steel or nickel alloys.
ASTM A358 TP304 or TP304L?
Choose 304 when standard corrosion resistance and mechanical properties meet the design requirement.
Consider 304L / S30403 where lower carbon content is preferred for welded fabrication and resistance to sensitization-related intergranular corrosion is important.
Do not substitute 304L for 304-or vice versa-without checking the project specification, design allowable stresses and material certificate requirements.
Procurement Checklist for ASTM A358 Pipe
Before requesting a quotation, provide:
Grade / UNS
ASTM A358 edition if specified
Class 1, 2, 3, 4 or 5
Outside diameter
Nominal wall thickness
Quantity
Required length
End preparation
Heat-treatment condition
RT / NDT requirement
Hydrostatic testing requirement
Applicable ASME Code
Supplementary requirements
Surface condition
MTC / EN 10204 requirement
Third-party inspection requirement
Packing requirement
Destination port
This information follows the purchasing logic built into ASTM A358 and substantially reduces technical clarification time before production.
Why Source ASTM A358 EFW Pipe from Dongmeng?
Xi'an Dongmeng Group Co., Ltd. supports industrial stainless steel piping projects from material confirmation through final inspection and export packing.
Our supply workflow can include plate traceability, EFW fabrication, dimensional inspection, solution heat treatment, NDT coordination, hydrostatic testing, bevel preparation, MTC review and third-party inspection.
Instead of quoting only from the words "ASTM A358 TP304," we recommend confirming the actual operating and purchasing conditions first.
Send us your:
OD × WT × Length + Class + Quantity + Application + Inspection Requirement
and our team will evaluate the suitable production and inspection route.
Need Technical Confirmation Before Ordering?
Request Quote
Send your pipe list or BOM.
Send Specification
Upload your piping material specification or drawing.
Request MTC
Ask for a sample material certificate and inspection document package.
Ask for Grade Selection
Provide medium, chloride level, temperature and pressure if you are comparing 304 with 304L, 316L or higher-alloy stainless steel.
Phone Number & Email
+8615769214734
office@dongmjd.com
Dong: +8615769214734
Our Office Address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
FAQ
What is ASTM A358 TP304 pipe?
ASTM A358 Grade 304 is electric-fusion-welded austenitic stainless steel pipe manufactured from stainless steel plate and intended for corrosive, high-temperature or general industrial applications.
Is ASTM A358 pipe seamless?
No. ASTM A358 covers electric-fusion-welded pipe.
What is UNS S30400?
UNS S30400 is the UNS designation corresponding to Type 304 austenitic stainless steel.
What is ASTM A358 Class 1?
Class 1 pipe is double welded using filler metal in all passes and is completely radiographed.
What is ASTM A358 Class 2?
Class 2 is double welded using filler metal in all passes, but radiography is not required by the basic Class 2 requirement.
Is Class 2 stronger than Class 1?
No. A358 Class numbers primarily define welding configuration and radiographic examination requirements. They should not be interpreted as mechanical-strength rankings.
What is the difference between ASTM A358 and ASTM A312?
ASTM A358 focuses on electric-fusion-welded pipe fabricated from plate and includes five weld/RT Classes. ASTM A312 covers seamless, welded and heavily cold-worked welded austenitic stainless steel pipe under a different manufacturing and testing framework.
Does ASTM A358 Grade 304 use ASTM A240 plate?
Yes. ASTM A358 specifies applicable stainless steel plate grades from ASTM A240/A240M.
Can ASTM A358 304 pipe be fully radiographed?
Yes. Complete radiography is part of the requirements for specific Classes including Class 1 and Class 3.
Is hydrostatic testing required?
ASTM A358 includes hydrostatic testing requirements for finished pipe, subject to the applicable specification and purchasing requirements.
Can you supply custom OD and wall thickness?
Project-specific OD and wall-thickness combinations can be evaluated according to forming, welding, heat-treatment, testing and transportation capability.
Is ASTM A358 Grade 304 suitable for seawater?
304 should not be selected automatically for continuous seawater or severe chloride service. Chloride concentration, temperature and service conditions should be reviewed, and 316L, duplex or higher-alloy materials may be more appropriate.
Can ASTM A358 pipe be supplied with MTC 3.1?
EN 10204 3.1 material documentation can be supplied when specified as part of the purchasing and inspection requirements.
What information is required for an ASTM A358 quotation?
Provide the grade, Class, OD, wall thickness, length, quantity, end preparation, testing requirements, heat-treatment requirements, applicable design code and required inspection documents.
Can third-party inspection be arranged?
Yes. Third-party inspection can be coordinated according to the agreed inspection and test plan before shipment.
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