Welded Stainless Steel Square Tube Structural ERW Hollow Section For Frames Railings

Price Negotiable

Price: Negotiable (Request a Quote)

MOQ: 100kg

Delivery Time: 15-25days

Brand: Baosteel，TISCO

Product Description

Welded stainless steel square tube is a hollow structural section with four equal sides, manufactured by forming a flat strip into a tube shape and welding the seam along its length.

Our welded square tubes are produced using high-frequency electric resistance welding (ERW) or TIG welding processes. They offer excellent dimensional accuracy, consistent wall thickness, and a cost-effective solution for structural and mechanical applications.

Product Specifications

Parameter	Details
Standard	ASTM A554, A312, EN 10296, JIS G3446, GB/T 12770
Grades	201, 304, 304L, 316, 316L
Size (Width x Width)	10 mm x 10 mm – 200 mm x 200 mm
Wall Thickness	0.8 mm – 6.0 mm
Length	3000 mm, 4000 mm, 6000 mm (custom cut available)
Welding Process	ERW (Electric Resistance Welded), TIG (Tungsten Inert Gas)
Surface Finish	Mill finish, Pickled, Polished (No.4, BA, Mirror), Brushed

Chemical Composition (Reference %)

Element	Grade 304	Grade 316	Grade 201
Carbon (C)	≤ 0.08	≤ 0.08	≤ 0.15
Silicon (Si)	≤ 1.00	≤ 1.00	≤ 1.00
Manganese (Mn)	≤ 2.00	≤ 2.00	5.5 – 7.5
Phosphorus (P)	≤ 0.045	≤ 0.045	≤ 0.050
Sulfur (S)	≤ 0.030	≤ 0.030	≤ 0.030
Chromium (Cr)	18.0 – 20.0	16.0 – 18.0	16.0 – 18.0
Nickel (Ni)	8.0 – 10.5	10.0 – 14.0	3.5 – 5.5
Molybdenum (Mo)	—	2.0 – 3.0	—

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
304	≥ 515	≥ 205	≥ 35
316	≥ 515	≥ 205	≥ 35
201	≥ 620	≥ 310	≥ 30

Note: The values above are for reference only. Please refer to the mill test certificate for actual data.

Key Features

Consistent wall thickness and dimensional accuracy
Smooth internal and external surfaces
Cost effective compared to seamless tubing
Available in long continuous lengths
Excellent weldability for fabrication
Good corrosion resistance

Welded vs. Seamless Comparison

Feature	Welded Tube	Seamless Tube
Manufacturing	Formed from strip and welded	Extruded from solid billet
Wall Thickness Consistency	Very consistent	Less consistent
Length Availability	Longer lengths available	Shorter lengths typical
Cost	Lower	Higher
Lead Time	Shorter	Longer
Pressure Rating	Good for mechanical use	Higher for pressure vessels
Best For	Structural, architectural, mechanical	High pressure, critical applications