Welded Stainless Steel Square Pipe
Longitudinally welded square hollow section in austenitic duplex and ferritic stainless grades
Specifications
Stainless Steel Pipe, Steel Pipe
Seamless Stainless Steel Round Pipe in 304 and 316L
Hollow bar drawn pipe in austenitic duplex and ferritic grades cut to your size
Seamless stainless steel round pipe is tube formed without a weld seam, so the wall is continuous around the full circumference and there is no heat affected zone to fail under pressure or corrosive attack. It is specified by process plant engineers, fluid system fabricators and equipment builders who need ASTM A312, EN10216 or JIS G3463 material in grades from 201 through 304L, 316L, 310S, 2205 and 904L. Ordering the grade, the size and the certificate from one source removes the usual problem of chasing a mill for one length of 316Ti while the rest of the package sits in the workshop waiting. Sizes are made to your requirement rather than pulled from a fixed catalog list.
- Product Name — Seamless Stainless Steel Round Pipe
- Standard — ASTM A312 EN10216 JIS G3463
- Material — 201 202 301 304 304L 309S 310S 316 316Ti 316L 410 430 2205 904L
- JIS Designation — SUS304 SUS304L SUS321 SUS316 SUS316L SUS309S SUS310S
- EN Material Number — 1.4372 1.4373 1.4301 1.4833 1.4845 1.4401 1.4571 1.4404
Why It Is Specified
Key Benefits of Seamless Stainless Steel Round Pipe
No Weld Seam To Inspect Or Fail
The pipe is formed from a solid billet so there is no longitudinal weld and no associated heat affected zone. This matters in pressure lines and in media that attack weld metal before they attack the parent grade.
Three Standards Covered From One Order
Material can be supplied against ASTM A312, EN10216 or JIS G3463 so a project mixing American European and Japanese drawings does not need three separate suppliers.
Grade Range From Budget To Duplex And Super Austenitic
The grade list runs from 201 and 202 through 304, 304L, 316, 316L and 316Ti up to 309S, 310S, 2205 and 904L. You can put the expensive grade only where the chemistry demands it.
Cross Referenced Grade Designations
Grades are quoted in ASTM, JIS SUS and EN material number form, so a drawing calling 1.4404 and one calling SUS316L can be matched to the same stock without a translation argument.
Small Trial Quantity Before A Production Run
The minimum order is 1 ton, and a free sample can be released so your welders and your polishing line can test the material before you commit.
Sizes Made To Your Requirement
Diameter and wall are customized rather than restricted to a stock list, which avoids buying the next size up and machining it down.
Problems It Solves
What This Material Removes From Your Process
Welded Tube Failing In The Seam Before The Parent Metal
In aggressive media the weld line is often the first thing to pit or crack. Seamless pipe has no seam, so the corrosion behavior of the whole wall matches the grade you specified.
Drawings That Quote Grades In Three Different Systems
One drawing asks for 1.4571, the next for SUS316Ti, the purchase order says 316Ti. The grade list is published in all three forms so the same material can be confirmed against any of them.
Buying A Full Mill Run To Test A New Grade
The minimum order is 1 ton and a free sample can be released, so a workshop can weld and polish a test length before committing to a production quantity.
Chasing Multiple Suppliers For One Project Package
Austenitic duplex ferritic and martensitic grades all come from the same order, so a package needing 304L 316L 430 and 2205 does not have to be split across four vendors.
Application Scenarios
Where It Is Used
Process Piping In Chemical And Pharmaceutical Plants
316L and 316Ti lines carrying acids solvents and cleaning media where a welded seam would be the first point of attack.
Food Dairy And Beverage Equipment
304 and 304L pipe runs feeding tanks pumps and fillers where the bore has to be smooth and cleanable.
Heat Exchanger And Furnace Components
309S and 310S pipe used where service temperature rules out the standard austenitic grades.
Seawater And Chloride Bearing Service
2205 duplex and 904L pipe for cooling circuits desalination skids and offshore equipment exposed to chloride pitting.
Structural And Handrail Fabrication
201 and 202 round pipe used where the duty is mechanical and cosmetic rather than corrosive and the budget is tight.
Instrument And Hydraulic Tubing Runs
Small diameter seamless pipe for pressure sensing lines and hydraulic circuits on packaged equipment.
Who It Is For
Buyers Who Specify This Product
- Process plant piping engineers specifying ASTM A312 material for acid and solvent service
- Equipment fabricators buying 304L and 316L pipe for tank skids pumps and filler frames
- Shipyard and offshore procurement teams sourcing 2205 duplex pipe for chloride exposed circuits
- Boiler and furnace builders buying 309S and 310S pipe for elevated temperature components
- Stainless stockists and distributors carrying a mixed grade range for regional workshops
- Project buyers reconciling drawings that quote EN material numbers against JIS SUS designations
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | Seamless Stainless Steel Round Pipe |
|---|---|
| Standard | ASTM A312 EN10216 JIS G3463 |
| Material | 201 202 301 304 304L 309S 310S 316 316Ti 316L 410 430 2205 904L |
| JIS Designation | SUS304 SUS304L SUS321 SUS316 SUS316L SUS309S SUS310S |
| EN Material Number | 1.4372 1.4373 1.4301 1.4833 1.4845 1.4401 1.4571 1.4404 |
| Size | Customized |
| Technique | Seamless or welded |
| Delivery | Within 7-10 working days after receiving the deposit or according to order quantity |
| Minimum Order Quantity | 1 ton or free sample |
| Certification | ISO9001 BV SGS RoHS |
| Price Term | TT or LC |
| Place of Origin | China |
Technical Features
- Standards ASTM A312 EN10216 and JIS G3463
- Austenitic grades 201 202 301 304 304L 309S 310S 316 316Ti 316L
- Ferritic and martensitic grades 410 and 430
- Duplex 2205 and super austenitic 904L available
- JIS designations SUS304 SUS304L SUS321 SUS316 SUS316L SUS309S SUS310S
- EN material numbers 1.4372 1.4373 1.4301 1.4833 1.4845 1.4401 1.4571 1.4404
- Seamless or welded technique to suit the duty
- Size customized to the ordered diameter and wall
Materials
- Austenitic stainless steel in 201 202 301 304 304L 316 316L and 316Ti
- Heat resisting austenitic grades 309S and 310S
- Ferritic 430 and martensitic 410 stainless steel
- Duplex stainless steel 2205 for chloride bearing service
- Super austenitic 904L for severe corrosion duty
Certification
- ISO9001
- BV
- SGS
- RoHS
- Mill test certificate supplied with the shipment
Manufacturing
How It Is Made and Processed
Billet selection against the ordered stainless grade
Seamless forming to produce a pipe with no longitudinal weld
Welded forming offered as an alternative technique where the duty allows
Sizing to the ordered outside diameter and wall thickness
Chemical and mechanical testing against ASTM A312 EN10216 or JIS G3463
Cutting to the ordered lengths
Marking bundling and packing for export
Quality Control
Checks Before It Ships
- Grade confirmed against the ASTM JIS or EN designation on the order
- Chemical composition checked against the applicable standard
- Outside diameter and wall thickness measured before packing
- Surface inspected for scratches and handling damage
- Certificates issued under the ISO9001 BV SGS and RoHS scope stated for this product
Customization
What We Can Change on Your Order
- Outside diameter and wall thickness made to your requirement
- Grade selected from the full 201 to 904L range per line item
- Seamless or welded technique chosen to match the service
- Cutting to fixed lengths against your piping list
- Free sample released for weld and polish trials before the production order
- Documentation issued in the ASTM JIS or EN designation your drawing uses
Comparison
Seamless Stainless Steel Round Pipe Against the Alternatives
| Welded stainless tube | Seamless pipe has no longitudinal weld and no heat affected zone, so there is no seam to inspect or to fail first in corrosive or pressure service. |
|---|---|
| Carbon steel pipe with a coating | Corrosion resistance comes from the alloy through the whole wall rather than from a surface layer that can be scratched during installation. |
| 304 pipe in chloride service | Stepping to 2205 duplex or 904L addresses chloride pitting that 304 will not survive, and both grades come from the same order. |
| Machined stainless hollow bar | Pipe arrives at the ordered diameter and wall, so you are not paying for metal that ends up as swarf. |
Use Guide
Specifying Handling and Welding Notes
- State the standard on the order because ASTM A312 EN10216 and JIS G3463 differ in test and tolerance requirements
- Give the grade in the designation your drawing uses and the cross reference will be confirmed back to you
- Use low carbon 304L or 316L where the joint will be welded and not solution annealed afterwards
- Keep stainless away from carbon steel during cutting handling and storage to avoid embedded iron
- Order a free sample first when a new grade has to be qualified on your welding procedure
- Confirm cut lengths against the piping isometric so pipe arrives ready to fit rather than needing site cutting
Questions Buyers Ask
Seamless Stainless Steel Round Pipe FAQ
Which standards can you supply this pipe against?
ASTM A312, EN10216 and JIS G3463. Name the one your drawing calls out on the order so the correct test regime is applied.
What is the minimum order quantity?
1 ton, or a free sample where you only need material to run a weld or polish trial.
Can you match a grade quoted as an EN material number?
Yes. The range is published in ASTM, JIS SUS and EN number form, so 1.4404 is confirmed as 316L and 1.4571 as 316Ti before the order is released.
Do you supply duplex and super austenitic grades?
2205 duplex and 904L are both available, along with the heat resisting 309S and 310S grades.
Is welded tube an option if seamless is not needed?
Yes. The technique is quoted as seamless or welded, so you can use welded pipe where the service does not justify seamless.
What sizes are held?
Size is customized rather than fixed to a stock list, so give the outside diameter, wall thickness and length you need and it will be quoted against that.
What certification comes with the material?
The product is supplied under ISO9001, BV, SGS and RoHS certification. Ask for the mill test certificate to be issued with the shipment.
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