Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 30mm Stainless Steel Tube Manufacturer in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
30mm Stainless Steel Tube Manufacturer
Dongmeng Group supplies 30mm stainless steel tube for industrial fabrication, architectural components, food equipment, machinery, fluid systems and custom OEM projects.
Our 30mm round stainless steel tubing is available in welded or seamless construction, with multiple stainless steel grades, wall thicknesses, lengths and surface finishes. Each order can be manufactured or processed according to the required application, dimensional standard and inspection plan.
30.0 mm outside diameter
Welded and seamless tube options
304, 304L, 316, 316L and other stainless steel grades
Custom wall thickness and cut-to-length service
Mill finish, pickled, bright annealed and polished surfaces
Material Test Certificate and third-party inspection available
Export packaging for sea, air and multimodal transportation
Request a Quote: Send us the grade, wall thickness, length, quantity, surface finish, standard and delivery destination. Our team will review the specification before quotation.
Important: What Does 30mm Mean?
For stainless steel tubing, 30mm normally refers to the outside diameter, or OD, unless the drawing or purchase order states otherwise.
A 30mm OD tube is not the same as:
A tube with a 30mm inside diameter
A 1-1/4 inch tube, which has an outside diameter of 31.75mm
A nominal DN pipe size
A 30mm × 30mm square tube
To avoid quotation errors, please specify the dimensions in the following format:
30mm OD × wall thickness × length
Example:
30mm OD × 1.5mm wall × 6000mm length
The inside diameter of this tube is:
30 − 1.5 × 2 = 27mm
30mm Stainless Steel Tube Specifications
| Specification | Available Options |
| Product | 30mm Stainless Steel Round Tube |
| Outside Diameter | 30.0mm |
| Common Wall Thickness | 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm |
| Custom Wall Thickness | Available subject to grade, standard and quantity |
| Inside Diameter | OD − 2 × wall thickness |
| Material Grades | 201, 304, 304L, 316, 316L, 321, 410, 430 |
| Production Type | Welded or seamless |
| Common Lengths | 3000mm, 5800mm, 6000mm or custom cut length |
| Surface Condition | Mill finish, pickled, bright annealed, brushed or polished |
| Polishing Options | 180 grit, 240 grit, 320 grit, 400 grit, 600 grit or mirror polish |
| End Treatment | Plain end, deburred, chamfered or drawing-specific |
| Processing | Cutting, bending, drilling, welding, polishing and fabrication |
| Documentation | MTC, packing list, certificate of origin and inspection report |
| Inspection | Dimensional, visual, PMI, eddy-current, hydrostatic or third-party inspection as required |
| Packaging | Bundles, protective film, plastic caps, wooden cases or seaworthy packing |
| MOQ | Depends on grade, wall thickness, finish and production route |
| Delivery | Confirmed after stock and production review |
All final tolerances, testing requirements and acceptance criteria should be stated in the purchase order or approved technical drawing.
30mm Tube Inside Diameter and Weight Chart
The following values are theoretical and intended for initial purchasing and logistics calculations.
| Outside Diameter | Wall Thickness | Inside Diameter | Approx. Weight |
| 30mm | 0.8mm | 28.4mm | 0.582 kg/m |
| 30mm | 1.0mm | 28.0mm | 0.722 kg/m |
| 30mm | 1.2mm | 27.6mm | 0.861 kg/m |
| 30mm | 1.5mm | 27.0mm | 1.065 kg/m |
| 30mm | 2.0mm | 26.0mm | 1.395 kg/m |
| 30mm | 2.5mm | 25.0mm | 1.713 kg/m |
| 30mm | 3.0mm | 24.0mm | 2.018 kg/m |
Stainless Steel Tube Weight Formula
For an approximate theoretical weight:
Weight in kg/m = (OD − wall thickness) × wall thickness × 0.02491
OD and wall thickness are entered in millimetres.
Actual shipment weight may vary because of dimensional tolerances, alloy density, surface treatment and manufacturing conditions.
Available Stainless Steel Grades
304 Stainless Steel Tube
304 is the standard choice for general-purpose stainless steel tubing. It provides a practical balance of corrosion resistance, fabrication performance, appearance and cost.
Typical applications include:
Furniture and display systems
Handrails and balustrades
Food-processing equipment
Machinery guards
General industrial fabrication
Indoor and normal outdoor structures
304L Stainless Steel Tube
304L has a lower carbon content than standard 304 and is commonly selected for welded fabrications where resistance to sensitization in the heat-affected zone is important.
Choose 304L when the tube will undergo extensive welding or when post-weld corrosion performance is a project requirement.
316 Stainless Steel Tube
316 contains molybdenum and offers better resistance to pitting and crevice corrosion in chloride-containing environments than 304.
Typical applications include:
Coastal structures
Marine equipment
Chemical-processing systems
Pharmaceutical equipment
High-humidity installations
Pulp and paper equipment
316L Stainless Steel Tube
316L combines the chloride resistance of 316 with a lower carbon content. It is frequently specified for welded equipment, sanitary systems and corrosion-sensitive fabrication.
321 Stainless Steel Tube
321 is titanium-stabilized and is used where resistance to intergranular corrosion and performance at elevated temperatures are important.
430 Stainless Steel Tube
430 is a ferritic, magnetic stainless steel. It is often selected for cost-sensitive decorative, appliance and exhaust-related applications where the corrosion environment is less demanding.
The correct grade depends on the operating medium, chloride concentration, cleaning chemicals, temperature, fabrication method and expected service life. Molybdenum-bearing grades such as 316 and 316L generally provide better resistance to chloride-related pitting than 304-series material.
304 vs 316 30mm Stainless Steel Tube
| Selection Factor | 304 / 304L | 316 / 316L |
| General Corrosion Resistance | Good | Higher |
| Chloride and Salt Exposure | Limited for demanding exposure | Better suited |
| Indoor Fabrication | Recommended | Usually not necessary |
| Coastal or Marine Environment | Application review required | Preferred starting option |
| Chemical Processing | Suitable for mild media | Better for more aggressive media |
| Welded Fabrication | 304L preferred | 316L preferred |
| Relative Material Cost | Lower | Higher |
| Typical Buyer | Furniture, construction and machinery | Marine, chemical, food and pharmaceutical |
Material selection must be based on the actual service conditions. Stainless steel grade alone does not determine the safe pressure, temperature or corrosion life of a finished system.
Welded vs Seamless 30mm Stainless Steel Tube
| Factor | Welded Tube | Seamless Tube |
| Manufacturing Route | Formed from strip and longitudinally welded | Produced without a longitudinal weld seam |
| Cost | Usually more economical | Usually higher |
| Dimensional Consistency | Well suited to controlled OD and wall dimensions | Depends on cold-drawing and finishing route |
| Surface Options | Wide range of decorative finishes | Commonly pickled, annealed or polished |
| Typical Use | Architecture, furniture, mechanical fabrication and general service | Pressure service, instrumentation, heat transfer and critical systems |
| Weld Seam | Present and may be processed or polished | No longitudinal weld seam |
| Selection Basis | Standard, pressure, appearance and fabrication requirements | Standard, pressure, corrosion and project specification |
A seamless tube should not automatically be described as suitable for every pressure application. Pressure capability must be confirmed using the applicable design code, material grade, wall thickness, temperature, manufacturing condition and test requirements.
Applicable Standards
The required standard should be chosen according to the intended service rather than using one standard for every 30mm tube.
| Standard | Typical Product Scope | Suitable Purchasing Situation |
| ASTM A554 | Welded stainless steel mechanical tubing | Handrails, furniture, ornamental and mechanical fabrication |
| ASTM A269/A269M | Seamless and welded austenitic tubing for general service | General corrosion-resistant and temperature service |
| ASTM A270/A270M | Seamless and welded sanitary stainless steel tubing | Food, beverage, dairy and pharmaceutical systems |
| ASTM A249/A249M | Welded austenitic tubes | Boiler, superheater, heat exchanger and condenser applications |
| ASTM A213/A213M | Seamless alloy and stainless tubes | Boiler, superheater and heat exchanger applications |
| ASTM A312/A312M | Seamless and welded stainless steel pipe | NPS or schedule-based pipe for corrosive and elevated-temperature service |
ASTM A554 specifically covers welded stainless steel mechanical tubing used where appearance, mechanical properties or corrosion resistance is required. ASTM A269 covers seamless and welded austenitic stainless tubing for general corrosion-resistant and low- or high-temperature service.
ASTM A270 applies to sanitary tubing, ASTM A249 and A213 cover heat-transfer tube applications, while ASTM A312 is a pipe specification rather than a general mechanical tube specification.
When submitting an inquiry, provide the complete standard designation, grade, dimensions, heat-treatment condition, testing requirements and certificate type.
Surface Finish Options
Mill or Pickled Finish
Suitable for industrial fabrication where appearance is not the primary requirement. Pickling removes heat tint and surface contamination created during thermal processing.
Bright Annealed Finish
A smooth, bright surface produced through controlled-atmosphere heat treatment. It is commonly selected for visible components and applications requiring a cleaner surface.
Brushed or Satin Finish
Brushed finishes provide a uniform directional texture and are commonly used for:
Handrails
Furniture
Interior decoration
Commercial equipment
Architectural structures
Polished Finish
Polished tubing can be supplied in different grit levels according to the required appearance. For visible assemblies, the polishing direction and acceptable surface defects should be defined before production.
Sanitary Internal Finish
For food, beverage or pharmaceutical applications, specify:
Required internal roughness
Mechanical or electropolished condition
Weld-bead treatment
Cleaning and passivation requirements
Inspection method
Applicable sanitary standard
Do not rely only on terms such as "sanitary finish" or "mirror finish." The required roughness and inspection criteria should be stated numerically in the purchase specification.
Applications of 30mm Stainless Steel Tubing
Architectural and Decorative Fabrication
Handrails and railing systems
Balustrades
Furniture frames
Shopfitting systems
Display racks
Interior structures
Decorative columns
Industrial Machinery
Machine frames
Protective guards
Rollers and sleeves
Equipment supports
Fabricated assemblies
Pneumatic and hydraulic components
Food and Beverage Equipment
Processing equipment
Equipment frames
Transfer systems
Cleaning-system components
Sanitary assemblies
The material grade, surface roughness and tube standard must be reviewed for direct product-contact applications.
Marine and Coastal Equipment
316 or 316L is generally the preferred starting grade for chloride and coastal exposure. Final grade selection should consider salt concentration, temperature, crevices, cleaning cycles and maintenance conditions.
Automotive and Exhaust Components
Exhaust sections
Decorative exhaust tips
Brackets
Tubular frames
Fluid-handling parts
The selected grade must match the operating temperature, condensate chemistry and service environment.
Heat Exchangers and Process Equipment
For heat-transfer applications, provide the applicable tube standard, design temperature, pressure, corrosion allowance and non-destructive testing requirements.
Custom Processing Services
Dongmeng Group can support project-specific tube processing subject to drawing review.
Available processing may include:
Precision cut-to-length
Deburring
Chamfering
Tube bending
Hole drilling
Slotting
End forming
Welding
Brushing and polishing
Protective film application
Component fabrication
Custom marking and packaging
For processed components, send a PDF drawing together with a STEP, DWG or DXF file when available. Drawings should include tolerances, weld symbols, finish requirements, inspection points and critical dimensions.
Quality Control and Inspection
A project-specific inspection plan may include the following stages:
1. Raw Material Verification
Material grade verification
Heat-number traceability
Chemical-composition review
Material Test Certificate review
Positive Material Identification when required
2. Dimensional Inspection
Outside diameter
Wall thickness
Inside diameter
Ovality
Straightness
Length
End condition
3. Surface Inspection
Scratches and dents
Pitting or contamination
Weld-seam condition
Polishing consistency
Surface roughness
Heat tint and discoloration
4. Mechanical and Production Tests
Depending on the ordered standard:
Tensile testing
Hardness testing
Flattening testing
Flaring testing
Reverse-flattening testing
Eddy-current testing
Hydrostatic testing
Ultrasonic testing
5. Final Documentation
Available project documents may include:
EN 10204 3.1 Material Test Certificate
Dimensional inspection report
PMI report
Non-destructive testing report
Surface roughness report
Packing list
Certificate of origin
Third-party inspection report
Testing and documentation requirements must be confirmed before quotation because they affect production cost, minimum quantity and lead time.
Packaging and Export Protection
30mm stainless steel tubes can be packed according to the finish, length and transportation method.
Common packaging options include:
Tube bundles with steel or plastic straps
Protective plastic sleeves
End caps
Waterproof wrapping
Protective film for polished surfaces
Wooden cases
Reinforced export frames
Seaworthy moisture-resistant packing
Polished tubes should be separated or protected to reduce surface rubbing during loading and transportation.
For container loading calculations, provide the required length, total quantity, bundle weight limit and unloading method.
Why Source from Dongmeng Group?
Dongmeng Group is a steel manufacturer and exporter with more than 20 years of experience in steel production and international supply. The company provides stainless steel products together with OEM and ODM processing support.
Our objective is to help industrial buyers control the complete purchasing process:
Material and standard review
Dimension confirmation
Production-route selection
Custom processing
Inspection planning
Export documentation
Protective packaging
International shipment coordination
Before production, our team reviews the purchase specification to reduce errors involving OD, ID, wall thickness, tube versus pipe standards, surface finish and inspection documents.
How to Get an Accurate Quotation
Please send the following information:
Stainless steel grade
30mm OD or 30mm ID
Wall thickness
Required length
Welded or seamless construction
Applicable standard
Surface finish
Total quantity
Required tolerance
Material certificate and testing requirements
Processing drawing, if applicable
Delivery country, city or seaport
Frequently Asked Questions
Is 30mm stainless steel tube measured by outside diameter?
Yes. Unless otherwise stated, 30mm tubing normally refers to a 30mm outside diameter. Buyers requiring a 30mm inside diameter should clearly specify the required OD and wall thickness.
What is the inside diameter of a 30mm × 1.5mm tube?
The inside diameter is 27mm:
30mm − 1.5mm − 1.5mm = 27mm.
What is the inside diameter of a 30mm × 2mm tube?
The inside diameter is 26mm:
30mm − 2mm − 2mm = 26mm.
Is 30mm tube the same as 1-1/4 inch tube?
No. A 1-1/4 inch outside diameter equals 31.75mm, so it is larger than a 30mm OD tube. Confirm whether the project accepts metric or imperial substitution before ordering.
Should I choose 304 or 316?
Choose 304 or 304L for general fabrication and normal environments. Consider 316 or 316L for coastal, marine, chloride-containing or more corrosive environments. Final material selection must consider the actual chemical medium, temperature and expected service life.
Is welded tubing suitable for handrails?
Welded stainless steel mechanical tubing, commonly ordered to ASTM A554, is widely used for handrails, balustrades, furniture and architectural fabrication.
Is seamless tube always required for pressure service?
Not necessarily. Both welded and seamless products may be suitable when manufactured, tested and designed according to the applicable standard. The decision must be based on the project code, pressure, temperature, grade, wall thickness and inspection requirements.
Can you supply polished 30mm stainless steel tube?
Polished, brushed, satin and mirror-finish options can be quoted. State the required grit, polishing direction, acceptable surface condition and whether both the inside and outside surfaces require treatment.
Can the tubes be cut to custom lengths?
Custom cutting can be quoted. Provide the finished length, tolerance, end condition, quantity and whether deburring or chamfering is required.
Can you provide a Material Test Certificate?
Material certificates and additional inspection documentation can be supplied according to the purchase specification. Confirm the required certificate type before ordering.
Request a Quote for 30mm Stainless Steel Tube
Need a standard tube, a polished architectural tube or a custom processed component?
Send Dongmeng Group your specification or technical drawing. We will review the grade, dimensions, production method, applicable standard, inspection requirements, packaging and delivery destination before preparing the quotation.
Contact Dongmeng Group
Email: office@dongmjd.com
WhatsApp / Phone: +86 157 6921 4734
Required information: grade + OD + wall thickness + length + quantity + standard + finish + destination.
Hot Tags: 30mm Stainless Steel Tube Manufacturer, China 30mm Stainless Steel Tube Manufacturer manufacturers, suppliers, factory, 440C Stainless Steel
