Galvanized Seamless Rectangle Steel Pipe
Jointless hollow section with a zinc coated surface in schedule wall thicknesses
Specifications
Seamless Steel Pipe, Steel Pipe
Stainless Steel Seamless Pipe in TP304 and TP316L
Pierced from round bar with no weld seam across the section for higher pressure duty
Stainless seamless steel pipe is made from stainless round bar and pierced so that no welding seam runs across any part of the section. It is specified by process piping contractors, food and pharmaceutical equipment builders and instrument tube fabricators who work to ASTM A312, ASTM A213, EN10216-5 or JIS G3459 rather than to a welded tube standard. Because the wall is continuous the pipe carries higher pressure than welded pipe of the same size, which removes the weld line as a point that has to be justified in a pressure calculation or an inspection report. Sizes run from 21.3mm outside diameter upward in schedules from SCH5S to SCH160 so one supplier can cover both thin instrument runs and heavy process legs.
- Product Name — Stainless Seamless Steel Pipe
- Product Form — Seamless pipe made from round bar
- Standards — ASTM A312 ASME SA312 ASTM A213 ASME SA213 ASTM A269 ASTM A632 ASME SA632 JIS G3459 JIS G3448 JIS G3463 EN10216-5 EN ISO1127 DIN 17456 DIN 17458 GOST 9941
- Material — TP304 TP304L TP309S TP310S TP316 TP316L TP316Ti TP321
- EN Numbering — 1.4301 1.4307 1.4833 1.4845 1.4401 1.4404 1.4571 1.4541
Why It Is Specified
Key Benefits of Stainless Seamless Steel Pipe
No Weld Seam Across the Section
The pipe is formed from round bar rather than rolled and welded strip, so there is no longitudinal seam anywhere in the wall. Pressure and corrosion behaviour is the same all the way around the circumference.
Higher Pressure Rating Than Welded Pipe
Seamless pipe bears higher pressure than welded pipe of the same diameter and wall. That lets you hold a design pressure without stepping up a schedule.
Eight Austenitic Grades From One Order
TP304 TP304L TP309S TP310S TP316 TP316L TP316Ti and TP321 are all available, so a mixed line list can be filled from a single purchase order instead of split across suppliers.
Three Standard Systems Covered
Material can be called out in the ASTM ASME numbering, the EN 1.4301 style numbering or the JIS SUS numbering. Drawings from different engineering offices can be quoted without a grade conversion argument.
Wall Range From Instrument Tube To Heavy Process Leg
Schedules run SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS, covering 1.65mm to 80mm wall.
Cut Lengths Instead Of Random Bundles
Standard length is 5.8-12m and lengths can be customized, so spool fabrication starts with less offcut in the yard.
Problems It Solves
What This Material Removes From Your Process
Weld Seam Rejected by the Inspection Scope
Some pressure and hygienic specifications will not accept a longitudinal weld in the pipe wall. Seamless pipe made from round bar has no seam across the whole section, so that clause is answered by the product itself.
Design Pressure Missed by a Welded Equivalent
A welded pipe of the same size can fall short of the required pressure. Seamless pipe bears higher pressure at the same diameter and wall, which avoids redesigning the run around a thicker schedule.
Grade Called Out in Three Different Numbering Systems
One project may call TP316L, another 1.4404 and another SUS316L for the same material. Quoting against all three numbering systems from one stock removes the substitution correspondence.
Mixed Wall Requirements Split Across Suppliers
Thin instrument schedules and heavy process schedules are often bought separately. A schedule range from SCH5S to SCH160 puts both on one order and one certificate package.
Random Lengths Creating Yard Offcut
Bundles delivered in random length force cutting and storage of short ends. Length is supplied at 5.8-12m or customized to the spool drawing.
Application Scenarios
Where It Is Used
Food Processing and Beverage Lines
Product contact piping and utility runs in food plants where a crevice free bore and a cleanable surface matter more than the cost per meter.
Petrochemical and Water Treatment Plants
Process headers, dosing lines and pump suction and discharge piping handling aggressive media in refineries and water treatment works.
Medical Equipment and Aerospace Components
Small diameter thin wall runs in medical equipment frames and fluid circuits, and in aerospace assemblies where the material certificate is part of the build record.
Home Appliances and Consumer Electronics
Tube used inside appliance and electronics assemblies where the part is drawn, bent or cut down from standard pipe stock.
Architectural Decoration and Hardware Tools
Handrail, structural trim and hardware tool bodies where the finished surface is visible and a weld line would show.
Automotive Fluid and Exhaust Circuits
Automotive fluid transfer and hot end components using TP321 or TP309S where cycling temperature is part of the duty.
Who It Is For
Buyers Who Specify This Product
- Process piping contractors buying ASTM A312 stainless line pipe against a refinery or water plant line list
- Food and beverage equipment builders sourcing TP316L pipe for product contact runs
- Instrument and tubing fabricators buying thin wall SCH5S and SCH10S pipe for small bore circuits
- Medical equipment manufacturers buying certified austenitic pipe for fluid handling assemblies
- Architectural metalwork shops buying seamless stainless pipe for handrail and decorative frames
- Distributors stocking a TP304 and TP316L size range for local fabrication customers
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 | Stainless Seamless Steel Pipe |
|---|---|
| Product Form | Seamless pipe made from round bar |
| Standards | ASTM A312 ASME SA312 ASTM A213 ASME SA213 ASTM A269 ASTM A632 ASME SA632 JIS G3459 JIS G3448 JIS G3463 EN10216-5 EN ISO1127 DIN 17456 DIN 17458 GOST 9941 |
| Material | TP304 TP304L TP309S TP310S TP316 TP316L TP316Ti TP321 |
| EN Numbering | 1.4301 1.4307 1.4833 1.4845 1.4401 1.4404 1.4571 1.4541 |
| JIS Numbering | SUS304 SUS304L SUS309S SUS310S SUS316 SUS316L SUS316Ti SUS321 |
| Outside Diameter | 1/2 inch to 48 inch or customized |
| Wall Thickness | SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS or customized |
| Wall Range | 1.65mm to 80mm |
| Length | 5.8-12m or customized |
| Place of Origin | China |
| Certification | ISO9001 BV SGS RoHS |
Technical Features
- Seamless construction pierced from stainless round bar with no weld seam
- Standards ASTM A312 ASME SA312 ASTM A213 ASME SA213 ASTM A269 ASTM A632 ASME SA632
- Standards JIS G3459 JIS G3448 JIS G3463 EN10216-5 EN ISO1127 DIN 17456 DIN 17458 GOST 9941
- Grades TP304 TP304L TP309S TP310S TP316 TP316L TP316Ti and TP321
- Equivalent numbering 1.4301 1.4307 1.4833 1.4845 1.4401 1.4404 1.4571 and 1.4541
- Outside diameter 1/2 inch to 48 inch or customized
- Wall thickness by schedule SCH5S to SCH160 and XS covering 1.65mm to 80mm
- Length 5.8-12m or customized
Materials
- Austenitic stainless steel TP304 and TP304L for general corrosion service
- Molybdenum bearing TP316 TP316L and TP316Ti for chloride bearing media
- Titanium stabilized TP321 for service where carbide precipitation is a concern
- Heat resisting TP309S and TP310S for elevated temperature duty
Certification
- ISO9001
- BV
- SGS
- RoHS
- Mill test certificate supplied with each shipment
Manufacturing
How It Is Made and Processed
Selection of stainless round bar in the ordered grade
Piercing the bar to form a hollow with no weld seam
Elongation and sizing to the ordered outside diameter and schedule
Heat treatment and pickling appropriate to the austenitic grade
Straightening and cutting to 5.8-12m or the ordered length
Dimensional and surface inspection against the ordered standard
End protection marking and bundling for export
Quality Control
Checks Before It Ships
- Grade verified against the ordered ASTM EN or JIS designation before release
- Outside diameter and wall checked against the ordered schedule
- Continuity of the wall confirmed so no seam is present across the section
- Surface inspected for scale pickling marks and handling damage
- Length and bundle count checked against the packing list
- Mill test certificate issued with the shipment
Customization
What We Can Change on Your Order
- Outside diameter outside the standard 1/2 inch to 48 inch listing on request
- Wall thickness supplied to a stated millimeter figure instead of a schedule number
- Cut lengths outside the 5.8-12m standard against your spool list
- Grade selection across the eight austenitic grades on a single order
- Standard of supply nominated as ASTM ASME JIS EN DIN or GOST
- End preparation and capping specified before packing
Comparison
Stainless Seamless Steel Pipe Against the Alternatives
| Welded stainless steel pipe | Seamless pipe has no welding seam across the whole section and bears higher pressure than welded pipe at the same size. |
|---|---|
| Carbon steel seamless pipe | Austenitic grades such as TP316L handle corrosive and hygienic media where carbon steel would need lining or coating. |
| Stainless tube bought to a tube standard | Supply here is to pipe standards such as ASTM A312 and EN10216-5 with schedule based wall, which matches piping design output directly. |
| Machined bar stock components | Buying pipe pierced from round bar rather than boring bar in house removes machining time and swarf on long runs. |
Use Guide
Specifying Handling and Welding Notes
- State the standard you are buying to as well as the grade so the correct test scope is applied
- Give wall as a schedule number where the design is schedule based and as a millimeter figure where it is not
- Use TP316L or TP316Ti where chlorides are present and reserve TP321 for cycling temperature service
- Keep stainless pipe away from carbon steel during storage and handling to avoid iron contamination of the surface
- Specify cut length against the spool drawing so field cutting is limited to closure pieces
- Ask for the mill test certificate with the order so the grade is documented before fabrication starts
Questions Buyers Ask
Stainless Seamless Steel Pipe FAQ
Which stainless grades can you supply in seamless pipe?
TP304 TP304L TP309S TP310S TP316 TP316L TP316Ti and TP321. The same grades can be quoted under the EN numbers 1.4301 1.4307 1.4833 1.4845 1.4401 1.4404 1.4571 and 1.4541 or the JIS SUS numbers.
What size range is available?
Outside diameter runs from 1/2 inch to 48 inch, which is 21.3mm upward, or customized. Wall is by schedule from SCH5S to SCH160 and XS, covering 1.65mm to 80mm.
Why choose seamless instead of welded stainless pipe?
Seamless pipe is made from round bar and has no welding seam across the whole section, so it bears higher pressure than welded pipe of the same dimensions.
Can you supply to ASTM A312 and to EN10216-5 on the same order?
Yes. The stock is offered against ASTM ASME JIS EN DIN and GOST standards, so different line items on one order can each name their own standard.
What lengths do you ship?
Standard supply is 5.8-12m. Cut lengths outside that range are available if you send the cutting list with the order.
Is the material suitable for food contact equipment?
Stainless seamless pipe is widely used in the food industry as well as in medical equipment and water treatment plants. Confirm the grade your own hygiene specification requires, usually TP304L or TP316L.
What certificates come with the pipe?
ISO9001 BV SGS and RoHS documentation is available and a mill test certificate covering the ordered grade ships with the material.
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