Seamless ASTM A511 304/304L Mechanical Tube

Mill plant: QINGSHAN steel

Standards: ASTM A511

Grades: 304/304L

Size: Round Tube:OD: 4-323mm, Wall Thickness: 0.2-6.0mm

Wiho metals is a leading stainless steel tubing supplier, manufacturer and processing center of the broadest stainless tubing and hollow section in China. Wiho metals produce and stock round, rectangle or square welded mechanical and structural steel tubing in various sizes and shapes. We supplying 304/304L stainless steel seamless hollow sections with a wide array of diameters and thicknesses and have the ability to customize your order with our stainless tube processing services.

We offer and supply the Stainless steel Round Tubing in ASTM A511 grade 304 and 304L for structural and ornamental applications where mechanical properties, appearance, or corrosion resistance is needed. The tubes are available as mill finish or polished in a variety of exterior dimensions and wall thicknesses. It also offers both strength and weldability for other applications.


ASTM A511 304/ 304L TubingChemical Composition

Grades C Mn Si P S Cr,min Ni,min N
304 ≤0.07 ≤2.0 ≤0.75 ≤0.045 ≤0.03 18.0-20.0 8.0- 10.5 /
304L ≤0.03 ≤2.0 ≤0.75 ≤0.045 ≤0.03 18.0-20.0 8.0- 12.0 0.10


ASTM A511 304/ 304L Mechanical Property

Grade Tensile Strength, ksi (min) Yield Strength 0.2%, ksi (min) Elongation % Hardness (Brinell) MAX
304 75 30 40 201
304L 70 25 40 201


304/304L Tubing Allowable deviation of the outer diameter

Types O.D(D) Available tolerance
High grades General grades
Unpolished and sandblasted ≤25 ±0.10 ±0.20
>25~<50 ±0.20 ±0.30
≥50 ±0.5% ±0.5%D ±0.7%D
Grinding and polishing ≤25 ±0.10 ±0.20
>25~<40 ±0.15 ±0.22
≥40~<50 ±0.15 ±0.25
 ≥50~<60 ±0.18 ±0.28
≥60~<90 ±0.25 ±0.30
≥90~<100 ±0.30 ±0.35
≥100~<200 On agreement ±0.5%D


We offer a variety of value-added secondary services for stainless round/square/rectangle tubing that meets your special requirements, We can provide high-grade appearance, precision laser cutting, saw cutting, bending, finishing 8K, mirror polishing, profiled pipe welding, laser and plasma cutting and other processing. Contact us for more information regarding specific requirements of ASTM A511 structural and mechanical stainless steel tubing, or call us now.

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