304 is a versatile stainless steel, which is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability). 304 stainless steel seamless pipe is a grade of stainless steel produced in accordance with the American ASTM standard. 304 is equivalent to my country's 06Cr19Ni10 stainless steel. 304 contains 18-20% chromium and 8-11% nickel. 304 is the most widely used stainless steel, heat-resistant steel, utility steel, and Huaye steel. Used in food production equipment, general chemical equipment, nuclear energy, etc.

A high-alloy steel that can resist corrosion in the air or in a chemically corrosive medium. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium. 304 stainless steel chemical composition: C ≤0.08 Si≤1.00 Mn≤2.00 P≤0.045 S≤0.03 Cr=18.00-20.00 Ni=8.00~11.00.

304 stainless steel seamless pipe is used for food equipment, general chemical equipment, and nuclear energy industry equipment as stainless heat-resistant steel.

The anti-rust performance of 304 stainless steel is stronger than that of 200 series stainless steel materials. High temperature resistance is also better, as high as 1000-1200 degrees. 304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion.

304 stainless steel has strong corrosion resistance in nitric acid with a concentration of ≤65% below the boiling temperature. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids. A high-alloy steel that can resist corrosion in the air or in chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as plating, but uses the inherent surface properties of stainless steel. It is used in many applications. A kind of steel, usually called stainless steel. High-alloy steels such as 13 chrome steel and 18-8 chrome-nickel steel represent performance.

304 stainless steel pipe size and allowable deviation

Deviation grade

Standardized outer diameter allowable deviation

D1

±1.5%, minimum ±0.75 mm

D2

±1.0%. Minimum ±0.50 mm

D3

±0.75%. Minimum ±0.30 mm

D4

±0.50%. Minimum ±0.10 mm

304 stainless steel seamless pipe weight formula: [(outer diameter-wall thickness)*wall thickness)*0.02491=kg/m (weight per meter)

Mechanical properties

Yield strength (N/mm2) ≥205

Tensile strength ≥520

Elongation (%) ≥40

Hardness HB ≤187 HRB≤90 HV≤200

Density 7.93 g cm-3

Specific heat c(20℃)0.502 J·(g·C)-1

Thermal conductivity λ/W(m·℃)-1 (at the following temperature/℃)

20 100 500

12.1 16.3 21.4

Linear expansion coefficient α/(10-6/℃) (between the following temperatures/℃)

20～100 20～200 20～300 20～400

16.0 16.8 17.5 18.1

Resistivity 0.73 Ω·mm2·m-1

Melting point: 1398～1420℃