Stainless Steel Welded Tubing
Stainless Tubular Products stocks a wide variety of welded pressure tubing in various grades, specifications and alloys. We offer stainless steel welded tube in numerous diameters and wall thicknesses.
The material is manufactured to ASTM A-269, ASTM A-249 or as rolled and welded product.
Stainless Welded Tube - Grades
We provide stainless steel welded tube in:
Nickel Alloy Grades for Welded Tubing
- Alloy 200
- Alloy 400
- Alloy 600
- Alloy 800
- Hastelloy C-276
Sizes of Welded Steel Tube
Available sizes include:
- 1/16” to 12” outside diameters
Stainless steel welded tubing is most often employed when corrosion resistance and machinability are required. All our stock is available in mill finish or as polished product.
Stainless Steel Welded Tubing Applications
Numerous industries use our stainless steel welded tube, including:
- Automotive
- Chemical & Petrochemical
- Food & Beverage processing
- Marine applications
- Oil & gas
- Pharmaceuticals
- Power generation
Why Engineers and Fabricators Specify Stainless Steel Welded Tube
Stainless steel welded tube is the preferred specification across numerous demanding applications and for good reason. The manufacturing process produces consistent outside diameters and wall thicknesses, giving engineers predictable tolerances for machining, bending and assembly. For fabrication shops that cut to length, notch or form tubing into finished components, the dimensional consistency directly affects throughput and scrap rates.
Price-to-Performance Ratio
Welded stainless tubing also provides purchasing managers with more cost-effective access to numerous sizes. Because it is produced by forming and welding flat-rolled strip, it can be manufactured in larger outside diameters and longer lengths than seamless alternatives, often at a lower cost per foot. For OEM manufacturers sourcing material for production runs, that price-to-performance ratio is meaningful.
Corrosion Resistance
From a material standpoint, austenitic grades like 304/304L and 316/316L retain the corrosion resistance properties that make stainless steel the material of choice in food processing, pharmaceutical manufacturing, chemical processing and water treatment equipment. For environments with higher chloride exposure or more aggressive media, grades like 317L, 321 or Duplex 2205 offer additional resistance without requiring a switch to nickel alloys.
When your application calls for a welded steel tube that meets tight dimensional specs, specific ASTM certifications or a less common alloy grade, our inventory and processing capabilities give you options that most distributors cannot offer.
Stainless Welded Tube for Structural and Mechanical Applications
Beyond pressure and process applications, welded stainless tubing sees significant use in structural fabrication and mechanical systems. Architectural fabricators specify round, square and rectangular welded tube for railings, frames and decorative structures where surface finish and corrosion resistance are required for long-term exposure. We stock our ornamental stainless tubing specifically for these applications.
In transportation and mechanical systems, welded tubes are used in exhaust components, heat exchanger shells and fluid handling assemblies where a consistent weld seam and verified wall thickness are critical to service life. Grades like 321 and 347 are especially common in high-temperature mechanical applications where intergranular corrosion resistance is specified.
For operations and supply chain managers who need to maintain consistent inventory, we stock welded stainless tubing in mill finish and polished finishes. Our cutting and deburring services let you order cut-to-length material rather than managing full-length drops, reducing handling time on your floor. We also carry a full line of stainless steel pipe fittings to complement your tubing order.
Get the Right Stainless Steel Welded Tube for Your Project
Our team works with purchasing managers, engineers and fabricators who need more than a catalog number. Tell us your grade, OD, wall thickness, quantity and certification requirements, and we will confirm availability and lead time from our stocked inventory.
Frequently Asked Questions About Stainless Steel Welded Tube
What is the difference between ASTM A-269 and ASTM A-249 for welded stainless tubing?
ASTM A-269 covers seamless and welded austenitic stainless steel tubing for general service and is used across numerous industrial applications where corrosion resistance and pressure containment are required. ASTM A-249 is more specific to boiler, heat exchanger and condenser applications and includes requirements for heat treatment and, in some cases, nondestructive electric testing. If your application involves heat transfer or elevated temperature service, your engineer may specify A-249. For general structural or fluid-handling use, A-269 is the more common specification.
Can stainless steel welded tubing be used in high-purity applications like semiconductor manufacturing?
Standard welded tubing is not typically specified for high-purity semiconductor or ultra-high-purity applications, which usually require electropolished seamless tubing with specific internal surface finish requirements (Ra values) and full lot traceability. However, for broader pharmaceutical and biotech applications that do not require ultra-high-purity internal surfaces, sanitary-grade welded tubing meeting 3-A Sanitary standards or similar specifications may be appropriate. See our sanitary tubing and fittings options for those needs.
Does the weld seam in welded stainless tubing affect its pressure rating?
For tubing manufactured to ASTM A-269 or A-249, the weld seam does not reduce the pressure rating relative to a seamless tube of the same dimensions and grade, provided the material meets the specification's hydrostatic test or nondestructive electric test requirements. The joint efficiency factor for austenitic stainless welded tube under these standards is 1.0, meaning the weld is considered equivalent to the base material for pressure design purposes. If your application involves elevated temperatures or pressure vessel code compliance, confirm the applicable code requirements with your engineer.
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