304 stainless steel is a common material in stainless steel, with a density of 7.93 g/cm³, which is also called 18/8 stainless steel in the industry. High temperature resistant to 800℃, with good processing performance and high toughness, it is widely used in industry and furniture decoration industry and food and medical industry.

Common labeling methods on the market include 06Cr19Ni10 and SUS304, among which 06Cr19Ni10 generally means national standard production, 304 generally means ASTM standard production, and SUS 304 means Japanese standard production.

304 is a versatile stainless steel, which is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a grade of stainless steel produced in accordance with the American ASTM standard

Physical properties：

Tensile strength σb (MPa)≥515-1035

Conditional yield strength σ0.2 (MPa)≥205

Elongation δ5 (%)≥40

Reduction of area ψ (%)≥?

Hardness: ≤201HBW; ≤92HRB; ≤210HV

Density (20℃, g/cm³): 7.93

Melting point (℃): 1398~1454

Specific heat capacity (0~100℃, KJ·kg-1K-1): 0.50

Thermal conductivity (W·m-1·K-1): (100℃) 16.3, (500℃) 21.5

Linear expansion coefficient (10-6·K-1): (0~100℃) 17.2, (0~500℃) 18.4

Resistivity (20℃, 10-6Ω·m2/m): 0.73

Longitudinal elastic modulus (20℃, KN/mm2): 193

Product Standards：

For 304 stainless steel, the Ni element in its composition is very important, which directly determines the corrosion resistance and value of 304 stainless steel.

The most important elements in 304 are Ni and Cr, but they are not limited to these two elements. The specific requirements are stipulated by the product standard. The common judgment in the industry is that as long as the Ni content is greater than 8% and the Cr content is greater than 18%, it can be considered as 304 stainless steel. This is why the industry will call this type of stainless steel 18/8 stainless steel. In fact, the relevant product standards have very clear regulations on 304, and these product standards have some differences for different shapes of stainless steel. Below are some common product standards and tests.

To determine whether a material is 304 stainless steel, it must meet the requirements of each element in the product standard. As long as one does not meet the requirements, it cannot be called 304 stainless steel.