Stainless Steel Welded Tube
Stainless steel welded pipes are formed by rolling stainless steel strips or plates into a shape and then welded (using methods such as argon arc welding or high-frequency welding). It is the most widely used form of stainless steel pipe, and its core features include high production efficiency, low cost, and a wide range of sizes.
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Product Introduction

Stainless Steel Welded Tube is manufactured by forming stainless steel strip or plate into a tubular shape and welding the seam, offering a cost-effective alternative to seamless tubing for many applications. Available in a wide range of grades including 304/304L, 316/316L, 430, and duplex alloys, welded tubes provide excellent dimensional accuracy, consistent wall thickness, and superior surface finishes at a lower cost than seamless equivalents. Modern welding technologies—including high-frequency welding (HFW), laser welding, and TIG welding—ensure weld quality that often matches or exceeds the parent material properties, making welded tubes suitable for both mechanical and pressure applications.

Welded stainless steel tubes combine manufacturing efficiency with material versatility, allowing for precise control over dimensions, tolerances, and surface characteristics. They are particularly advantageous for applications requiring thin walls, complex shapes, or specific surface finishes that would be difficult or expensive to produce in seamless form. From architectural frameworks and automotive exhaust systems to food processing equipment and hydraulic lines, welded tubes offer a balanced solution that meets both performance requirements and economic considerations.

Product parameters


Item / Parameter

Specification for Welded Stainless Steel Tube

Notes / Significance

Key Feature

The Precision, Cost-Effective Tubing Solution. Superior dimensional accuracy, consistent wall thickness, and excellent surface finish at lower cost than seamless tubing.

The preferred choice for applications where precision dimensions and surface quality are prioritized.

Common Manufacturing Methods

HFW (High-Frequency Welding): High-volume production
Laser Welding: Precision, high-quality welds
TIG Welding: High-integrity applications
Plasma Welding: Specialized applications

Welding method selection depends on application requirements and production volume.

Available Grades

Austenitic: 304/304L, 316/316L, 321, 347
Ferritic: 430, 409, 439, 444
Martensitic: 410, 420
Duplex: 2205, 2507
Precipitation Hardening: 17-4PH

Full range of stainless steel grades available in welded form.

Size Range

Diameter: Typically 6mm - 1200mm
Wall Thickness: 0.5mm - 12.7mm
Length: Standard 6m, custom lengths available

Broader size range than seamless for certain dimensions.

Dimensional Tolerances

OD Tolerance: Typically ±0.1mm to ±0.5%
Wall Tolerance: ±10% standard, ±5% precision
Straightness: 1-3mm per meter
Length Tolerance: ±3mm to ±10mm

Superior dimensional consistency compared to seamless tubing.

Surface Finishes

Mill Finish: As-welded condition
Polished: Mechanical polishing (180-600 grit)
BA (Bright Annealed): Mirror finish
Electropolished: For hygienic applications
Bead Blasted: Matte appearance

Wide range of finishes for aesthetic and functional requirements.

Mechanical Properties

Tensile Strength: Varies by grade (typically 500-700 MPa for austenitic)
Yield Strength: Varies by grade
Elongation: ≥30-40% for austenitic grades
Weld Strength: ≥90% of base metal

Modern welding ensures weld properties match base material.

Pressure Ratings

Hydraulic Pressure: Calculated per ASME B31.3
Collapse Pressure: Depends on D/t ratio
Burst Pressure: Function of material strength

Suitable for pressure applications when properly manufactured and tested.

Key Standards

ASTM A554: Welded Mechanical Tubing
ASTM A249: Welded Boiler/Heat Exchanger Tubes
ASTM A358: EFW Pipe (larger diameters)
ASTM A269: General Service Welded Tubes
EN 10296-2: Welded Circular Tubes
JIS G3446: Stainless Steel Welded Tubes

Comprehensive standardization ensures quality and reliability.

Common Applications

• Architectural: Handrails, structural frames, decorative elements
• Automotive: Exhaust systems, fuel lines, structural components
• Food & Beverage: Process piping, conveyor frames, hygienic systems
• Furniture: Frames, legs, structural supports
• Industrial: Hydraulic lines, pneumatic systems, machinery frames
• Medical: Equipment frames, instrument components
• Energy: Heat exchanger tubes, solar panel frames

Versatile solution across multiple industries.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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FAQ

Q:What about your price? 
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products. 

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase. 

Q:Does the product have quality inspection before loading? 
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely. 

Q:How about the delivery time? 
A:Within 3-15 days after we confirm you requirement. 

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me. 

Q: Do you provide samples? 
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company? 
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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