chemical composition

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Carbon C: ≤ 0.030

Silicon Si: ≤ 1.00

Manganese Mn: ≤ 2.00

Sulfur S: ≤ 0.030

Phosphorus P: ≤ 0.045

Chromium Cr: 16.00~18.00

Nickel Ni: 10.00-14.00

Molybdenum Mo: 2.00-3.00

Corrosion resistance

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316L is widely used in the chemical industry due to its excellent corrosion resistance. It is also a derivative steel of 18-8 austenitic stainless steel, with 2-3% Mo added. On the basis of 316L, many steel grades have also been derived, such as adding a small amount of Ti to derive 316Ti, adding a small amount of N to derive 316N, and increasing the content of Ni and Mo to derive 317L.

Most of the existing 316L on the market are produced according to American standards. Due to cost considerations, steel mills generally limit the Ni content of their products as much as possible. According to the American standard, the Ni content of 316L is 10-14%, while the Japanese standard stipulates that the Ni content of 316L is 12-15%. According to the minimum standard, there is a 2% difference in Ni content between American and Japanese standards, which is quite significant in terms of price. Therefore, when customers choose 316L products, they still need to see clearly whether the products are based on ASTM or JIS standards.

The Mo content of 316L gives the steel excellent corrosion resistance and can be safely applied in environments containing Cl - and other halogen ions. Due to the fact that 316L is mainly used for its chemical properties, steel mills have slightly lower surface inspection requirements for 316L (compared to 304), and customers with higher surface requirements should strengthen surface inspection efforts.

mechanical property

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Tensile strength σ B (MPa): ≥ 480

Conditional yield strength σ 0.2 (MPa): ≥ 177

Elongation rate δ 5 (%): ≥ 40

Reduction of area ψ (%): ≥ 60

Hardness: ≤ 187HB; ≤ 90HRB; ≤ 200HV

Density: 7.98g/cm3;

Specific heat capacity ratio (20 ℃): 0.502J/(g * K)

Thermal conductivity (W/(m * K))

100 ℃

300 ℃

500 ℃

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heat treatment

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Solid solution fast cooling at 1010-1150 ℃.

Metallographic structure