Stainless Steel Welded Tube
Stainless Steel Welded Tube
Stainless Steel Welded Tube is available in 201, 304, 316, and 316L grades, with round, square, and rectangular profiles. Suitable for decorative and industrial applications, it offers good corrosion resistance and dimensional consistency. Available finishes include satin, hairline, and mirror polish, with applicable ASTM standards upon request.
- Mill Test Certificate Provided
- Strict Quality Inspection
- Custom Sizes Available
- On-Time Global Delivery
Stainless Steel Welded Tube is manufactured by forming stainless steel strip or coil into tubular sections and joining the edges through longitudinal welding. Depending on the intended application, welded tubes may undergo weld bead removal, sizing, straightening, and surface finishing. For decorative and mechanical applications, outside dimensions, wall thickness, weld seam appearance, and surface consistency are important factors in product selection.
Different product standards apply to different service requirements. ASTM A554 covers welded stainless steel mechanical tubing for architectural fittings, furniture, and fabricated components. ASTM A249/A249M specifies welded austenitic stainless steel tubing for boilers, heat exchangers, and condensers. ASTM A312/A312M covers stainless steel pipe for industrial piping systems, commonly specified by nominal pipe size (NPS) and wall thickness schedule. Each standard has distinct manufacturing, dimensional, and inspection requirements.
Product selection should reflect actual operating conditions. Decorative applications typically prioritize surface appearance, tube shape, and dimensional consistency, while industrial piping projects require careful evaluation of pressure, temperature, corrosion exposure, and testing requirements. For accurate quotations, buyers should specify the stainless steel grade, applicable ASTM standard, outside diameter or NPS, wall thickness or schedule, surface finish, inspection documentation, and required quantity.
Key Features of Stainless Steel Welded Tube
- Multiple Material Grades: Available in 201, 304, 304L, 316, and 316L stainless steel grades, with grade selection based on the applicable product standard and service conditions.
- Welded Construction: Manufactured with longitudinal welded seams, with weld finishing and inspection options selected according to the intended application and order requirements.
- Various Tube Shapes: Round, square, and rectangular profiles support different architectural, mechanical, and fabrication requirements, subject to the applicable product standard.
- Application-Specific ASTM Standards: ASTM A554, ASTM A249/A249M, and ASTM A312/A312M apply to their respective mechanical tubing, heat exchanger tubing, and piping applications.
- Surface Finish Options: Satin, hairline, mirror-polished, and annealed and pickled finishes are available according to product type, manufacturing requirements, and supply availability.
- Custom Specifications: Outside dimensions, wall thicknesses, lengths, end preparation, and processing options can be specified according to project requirements and production availability.
Stainless Steel Welded Tube — Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Welded Tube |
| Material Grades | 201, 304, 304L, 316, 316L (subject to the applicable standard and availability) |
| Material Type | Austenitic Stainless Steel |
| Manufacturing Process | Longitudinal Welding |
| Applicable Standards | ASTM A554 (mechanical tubing); ASTM A249/A249M (boiler, heat exchanger and condenser tubing); ASTM A312/A312M (pipe), as applicable |
| Tube Shapes | Round, Square, Rectangular (by product type and applicable standard) |
| Outside Diameter / Dimensions | Round: outside diameter; square / rectangular: outside dimensions, as specified |
| Wall Thickness | As per product specification; schedule designation where applicable to pipe |
| Length | Standard or Custom Lengths, Subject to Availability |
| Surface Finish | Satin, Hairline, Mirror Polished, Annealed & Pickled (by product type) |
| End Condition | Plain Ends / Prepared Ends, as Specified |
| Processing | Cutting, Polishing, Sizing |
| Inspection | According to the Applicable Standard and Agreed Order Requirements |
| Applications | Architectural, Mechanical, Industrial Piping, Heat Exchangers (with suitable grade and specification) |
| Packaging | Standard Export Packaging |
Grade availability, dimensions, tolerances, surface finish, and inspection requirements must be confirmed for the selected product standard and purchase order. The listed ASTM standards apply to different product types and are not interchangeable.
Applications of Stainless Steel Welded Tube
1. Architectural & Decorative Applications
Stainless Steel Welded Tube is commonly used for handrails, balustrades, architectural frames, and decorative fittings. Round, square, and rectangular profiles provide flexibility in building and interior projects. Surface finishes such as satin, hairline, and mirror polishing are selected according to appearance, maintenance, and installation requirements.
2. Furniture & Mechanical Fabrication
Welded stainless steel tubes are used to manufacture furniture frames, equipment supports, machine guards, and fabricated metal assemblies. Tube dimensions, wall thickness, and weld seam condition influence subsequent cutting, bending, and joining operations. ASTM A554 mechanical tubing is commonly specified for suitable fabrication applications.
3. Industrial Piping Systems
Stainless steel welded pipe is used in industrial systems for transporting compatible liquids and process fluids. ASTM A312 welded pipe may be specified for applications requiring defined material properties, dimensions, and inspection procedures. Selection depends on operating pressure, temperature, fluid composition, and corrosion conditions.
4. Heat Exchangers & Thermal Equipment
Welded stainless steel tubing is used in shell-and-tube heat exchangers, condensers, and selected boiler components. ASTM A249 tubing is designed for applications with specific manufacturing, heat treatment, and testing requirements. Tube dimensions, material grade, and operating conditions must be evaluated to ensure suitability for thermal equipment.
Frequently Asked Questions
1. What is the difference between stainless steel welded tube and welded pipe?
Stainless steel welded tubes are commonly specified by outside diameter, wall thickness, and shape for mechanical or decorative applications. Welded pipes are generally used in fluid transportation systems and are often specified by nominal pipe size (NPS) and schedule. The applicable manufacturing standard determines the dimensional and inspection requirements.
2. What stainless steel grades are available for welded tubes?
Common grades include 201, 304, 304L, 316, and 316L. Grade 201 is suitable for many indoor decorative applications, while 304 offers better general corrosion resistance. Grades 316 and 316L provide improved resistance to chloride-containing environments, with 316L offering lower carbon content for applications involving welding.
3. What ASTM standards apply to stainless steel welded tubes?
ASTM A554 covers welded stainless steel mechanical tubing, while ASTM A249/A249M applies to welded austenitic stainless steel tubing for boilers, heat exchangers, and condensers. ASTM A312/A312M covers stainless steel pipe for industrial piping systems. Each standard has different manufacturing, dimensional, heat treatment, and testing requirements.
4. What is the difference between welded and seamless stainless steel tubes?
Welded stainless steel tubes are manufactured by forming stainless steel strip and joining the edges through welding. Seamless tubes are produced without a longitudinal weld seam. Both can be suitable for industrial applications, depending on the material grade, manufacturing standard, operating conditions, and required inspection procedures.
5. What surface finishes are available for stainless steel welded tubes?
Common decorative finishes include satin, hairline, and mirror polishing. Annealed and pickled finishes are used for certain industrial tube and pipe products. Finish availability depends on the material grade, manufacturing process, tube dimensions, and applicable product specification.
6. Can stainless steel welded tubes be customized for bulk orders?
Stainless steel welded tubes can be specified by material grade, tube shape, outside diameter, wall thickness, length, and surface finish. For industrial piping, buyers should also provide the applicable standard, NPS, schedule, and inspection requirements. Custom processing, minimum order quantity, and delivery schedules depend on manufacturing capabilities and order specifications.
