304 is a versatile stainless steel, which is widely used in the production requirements of good overall performance (corrosion resistance and formability) of the equipment and machinery. 304 stainless steel is produced in accordance with the United States ASTM standards of a grade of stainless steel. 304 is equivalent to China’s 0Cr19Ni9 (0Cr18Ni9) stainless steel. 304 containing 19% chromium and 9% nickel. 304 is the most widely used stainless steel, heat-resistant steel, practical steel, steel industry in China. For food production equipment, general chemical equipment, nuclear energy.

A high-alloy steel that is resistant to corrosion in air or in a chemically corrosive medium. Steel must contain more than 12% chromium in order to maintain the inherent corrosion resistance of the stainless steel. 304 stainless steel Chemical composition: Specification C Si Mn P S Cr Ni (Ni) Mo SUS304 ≤0.08 ≤1.00 ≤2.00 ≤0.05 ≤0.03 18.00-20.00 8.25 ~ 10.50.

Dimensions and tolerances of 304 stainless steel tubes

Deviation level
Normalized outside diameter tolerance
D1 ± 1.5%, the smallest ± 0.75 mm
D2 ± 1.0%. Minimum ± 0.50 mm
D3 ± 0.75%. Min ± 0.30 mm
D4 ± 0.50%. Minimum ± 0.10 mm
304 stainless steel tube theoretical weight formula: (diameter – wall thickness) × wall thickness × 0.02491 = weight per meter (kg) Mechanical properties
Yield strength (N / mm2) ≥205
Tensile strength ≥ 520
Elongation (%) ≥40
Hardness HB ≤ 187 HRB ≤ 90 HV ≤ 200
The density is 7.93 g · cm-3
Specific heat c (20 ° C) 0.502 J · (g · C) -1
Thermal conductivity λ / W (m · ° C) -1 (at the following temperature / ° C)
20 100 500
12.1 16.3 21.4
Linear expansion coefficient α / (10-6 / ℃) (between the following temperature / ℃)
20 to 10020 to 200 to 300 to 20 to 400
16.0 16.8 17.5 18.1
The resistivity was 0.73 Ω · mm 2 · m -1
Melting point 1398 ~ 1420 ℃