Welded Stainless Steel Rectangle Pipe
Rectangular hollow section that puts the deeper wall where the bending load acts
Specifications
Stainless Steel Pipe, Steel Pipe
Welded Stainless Steel Square Pipe in 304 and 316L
Longitudinally welded square hollow section in austenitic duplex and ferritic stainless grades
Welded stainless steel square pipe is a hollow section formed from stainless strip and closed with a single longitudinal weld, supplied against ASTM A312, EN10216 or JIS G3463 in grades running from 201 and 430 through 304 and 316L to 2205 and 904L. It is specified by architectural metalworkers, food and beverage plant fabricators and machine frame builders who want a flat faced section that butts and bolts square without a machining step. Ordering it customized to your section and length stops the habit of buying whatever size the local stockist holds and cutting the difference into scrap. Minimum order is 1 ton, or a free sample if the grade and finish have to be checked before a production run is committed.
- Product Name — Welded Stainless Steel Square Pipe
- Section Shape — Square hollow section
- Technique — Welded
- Standard — ASTM A312 EN10216 JIS G3463
- Material Grades — 201 202 301 304 304L 309S 310S 316 316Ti 316L 410 430 2205 904L
Why It Is Specified
Key Benefits of Welded Stainless Steel Square Pipe
Flat Faces That Simplify Joints and Fixings
Four flat faces let brackets, base plates and panels sit flush without shimming. Fabrication time drops because there is no round surface to notch or saddle.
Grade Range From 201 to 904L in One Order
Budget 201 and 430 sections can be ordered alongside 304, 316L, 2205 and 904L on the same shipment. You match corrosion resistance to each part of the structure instead of over-specifying the whole frame.
Lower Cost Route Than Seamless for the Same Section
Strip formed and welded square pipe reaches the same outside dimensions as a seamless section at a lower conversion cost. For frames and non-pressure duty the weld seam is not a limitation.
Customized Sizes Rather Than Stock Lengths
Section size and length are made to your requirement. Cutting lists come in as finished members so the workshop is not paying to store and dispose of offcuts.
Three Standards Covered on One Certificate Trail
ASTM A312, EN10216 and JIS G3463 are all available, so a project drawing written to any of the three can be supplied without a substitution argument at inspection.
Documented Grade With ISO9001 BV SGS and RoHS
The certification set covers ISO9001, BV, SGS and RoHS. Ask for the mill test certificate with the shipment so the grade is recorded against the job number.
Problems It Solves
What This Material Removes From Your Process
Paying for a Corrosion Grade You Do Not Need
Frames often get specified in 316L because that is what the stockist carries. With 201, 430, 304, 316L, 2205 and 904L all available you can put the expensive grade only where the environment demands it.
Stock Sizes That Force Extra Cutting and Waste
Size is customized rather than fixed to a stock list. The section arrives at the dimension the drawing calls for, which removes a cutting operation and the offcut it generates.
Drawings Written to a Standard You Cannot Source
A frame drawn to JIS G3463 is awkward to buy in an ASTM market. Supply against ASTM A312, EN10216 or JIS G3463 removes the substitution paperwork at approval stage.
Committing Tonnage Before Seeing the Material
A free sample can be released and minimum order is 1 ton, so the surface finish and weld seam can be judged before a full order is placed.
Application Scenarios
Where It Is Used
Architectural Balustrade and Handrail Frames
Square posts and infill members in 304 for interior work and 316L where the balustrade faces coastal air or de-icing salt.
Food and Beverage Plant Framework
Wash down machine frames, conveyor legs and table structures in 304 and 316L where the section has to be cleanable and free draining.
Machine Bases and Equipment Enclosures
Welded square sections make rigid bases and cabinet frames for packaging, filling and processing lines.
Chemical and Marine Support Structures
2205 duplex and 904L sections for supports and walkway frames in chloride bearing atmospheres where 304 pits.
Furniture Shopfitting and Display Systems
201 and 430 square pipe for indoor shelving, display stands and shopfront frames where the duty is appearance rather than corrosion.
Solar and Greenhouse Mounting Frames
Square members used for mounting rails and support posts that need a flat face for clamp fixings.
Who It Is For
Buyers Who Specify This Product
- Architectural metalwork contractors buying square posts and rails for balustrades and shopfronts
- Food and beverage plant fabricators buying 316L frames for wash down equipment
- Machine builders buying square section for equipment bases and enclosure frames
- Project procurement engineers buying to an ASTM A312 or EN10216 line on a drawing
- Stainless stockists buying customized sections to fill regional frame and handrail demand
- EPC subcontractors buying duplex 2205 supports for chloride exposed structures
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 | Welded Stainless Steel Square Pipe |
|---|---|
| Section Shape | Square hollow section |
| Technique | Welded |
| Standard | ASTM A312 EN10216 JIS G3463 |
| Material Grades | 201 202 301 304 304L 309S 310S 316 316Ti 316L 410 430 2205 904L |
| 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 |
| Size | Customized |
| Delivery | Within 7-10 working days after receiving the deposit or according to order quantity |
| Minimum Order | 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
- Grades 201 202 301 304 304L 309S 310S 316 316Ti 316L 410 430 2205 and 904L
- JIS designations SUS304 SUS304L SUS321 SUS316 SUS316L SUS309S and SUS310S
- EN material numbers 1.4372 1.4373 1.4301 1.4833 1.4845 1.4401 1.4571 and 1.4404
- Longitudinally welded square hollow section
- Size and wall thickness customized to order
- Minimum order 1 ton or free sample
- Certification ISO9001 BV SGS and RoHS
Materials
- Austenitic stainless grades 301 304 304L 309S 310S 316 316Ti and 316L
- Economy chromium manganese grades 201 and 202 for indoor and decorative frames
- Martensitic and ferritic grades 410 and 430
- Duplex 2205 and super austenitic 904L for chloride bearing service
Certification
- ISO9001
- BV
- SGS
- RoHS
Manufacturing
How It Is Made and Processed
decoiling stainless coil to the strip width for the finished section
Roll forming the strip into a square profile
Longitudinal welding of the closing seam
Sizing and straightening to the ordered square dimension
Cutting to the ordered length
Surface finishing and marking
Bundling and export packing for container loading
Quality Control
Checks Before It Ships
- Grade confirmed against the ordered ASTM EN or JIS designation
- Weld seam inspected along the full length of each section
- Outside dimensions and squareness checked against the ordered size
- Wall thickness verified before cutting to length
- Length and quantity reconciled against the cutting list at packing
Customization
What We Can Change on Your Order
- Square section size and wall thickness made to your drawing
- Cut to length against your member list instead of stock lengths
- Grade selected per member from 201 through 316L to 2205 and 904L
- Standard nominated as ASTM A312 EN10216 or JIS G3463
- Free sample released before a production order
- Marking and bundle sizes arranged for the receiving workshop
Comparison
Welded Stainless Steel Square Pipe Against the Alternatives
| Seamless stainless square pipe | Welded square pipe is formed from strip rather than pierced, which lowers the conversion cost for structural and frame duty where there is no internal pressure to contain. |
|---|---|
| Galvanized carbon steel square tube | The corrosion resistance is in the alloy rather than in a coating, so cut ends and weld zones do not become the first point of failure. |
| Aluminum extruded profile | Stainless square pipe is welded with conventional stainless procedures and carries far higher local loads at brackets and fixings. |
| Welded stainless round pipe | Flat faces accept plates, clamps and panel edges directly, while a round section needs saddling or a bracket to make the same joint. |
Use Guide
Specifying Handling and Welding Notes
- Match the grade to the exposure and keep 316L 2205 or 904L for chloride bearing zones rather than the whole frame
- Orient the weld seam into the concealed face when appearance matters on a visible frame
- Use stainless filler matched to the parent grade and keep interpass temperature controlled on austenitic sections
- Pickle and passivate weld zones on food and marine frames so the chromium oxide layer reforms
- Store and handle away from carbon steel to avoid iron contamination and later rust spotting
- Send the member list with sizes and lengths so sections arrive cut and ready to assemble
Questions Buyers Ask
Welded Stainless Steel Square Pipe FAQ
Which standards can you supply the square pipe against?
ASTM A312, EN10216 and JIS G3463. Nominate the one your drawing calls out when you send the enquiry.
What is the minimum order and can we get a sample first?
Minimum order is 1 ton, or a free sample can be released so you can check grade and finish before committing the tonnage.
Can you supply duplex 2205 and 904L in square section?
Yes. 2205 and 904L are both in the grade range along with the standard austenitic and ferritic grades, and they are normally chosen for chloride exposure.
Are the sizes fixed or made to our dimensions?
Size is customized. Send the outside dimension, wall thickness and lengths you need and the sections are made to that.
What is the delivery time after we place the order?
Within 7-10 working days after the deposit is received, or according to the order quantity for larger tonnages.
Do you provide a certificate with the material?
Certification covers ISO9001, BV, SGS and RoHS. Ask for the mill test certificate with the shipment so the grade is documented against your job.
Is 201 an acceptable substitute for 304 on an indoor frame?
For dry indoor work where appearance is the requirement, 201 is often used and costs less. For wash down, outdoor or coastal exposure specify 304 or 316L instead.
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