Q355D Mold Steel Introduction

Q355D Mold Steel Introduction

Q355D mechanical properties: yield strength: ≥355MPA tensile strength: 450MPA-630MPA elongation: ≥21% impact test: -20 °C: ≥34KJQ355D steel plate Z-direction performance expression method: Q355D-Z15 indicates that the elongation after breaking in the thickness direction of the steel plate is more than 15%. Q355D-Z25 indicates that the elongation after breaking in the thickness direction of the steel plate is more than 25%. Q355D-Z35 indicates that the elongation after breaking in the thickness direction of the steel plate is more than 35%.

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Q355D application field: Q355D steel is widely used in bridges, buildings, vehicles, ships and other fields because of its excellent mechanical properties and welding properties. In bridge construction, Q355D steel is used to bear the self-weight and traffic load of the bridge; In the field of construction, it is used to construct structures such as high-rise buildings, factories, warehouses, etc.; In vehicle manufacturing, Q355D steel is used to manufacture the main load-bearing components of vehicles, such as automobiles, trains, and ships; In shipbuilding, it is used to make structures such as hulls, decks, etc. In addition, Q355D steel can also be used to manufacture petrochemical equipment such as pressure vessels, pipelines, storage tanks, etc.

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What material is CR15?

15CR, alloy structural steel, which is a commonly used low-carbon alloy carburizing steel, can significantly increase the surface carbon content and increase the carburizing depth during carburizing, but there is a tendency to grow grains and form reticulated carbides when carburizing at high temperature and for a long time; For parts with simple shape and low requirements, it can be directly cooled and quenched after carburizing, but the deformation is large after heat treatment, and there is tempering brittleness, and the hardenability of steel is higher than that of No. 15 carbon steel, and the critical quenching diameter in oil is 2~15MM, and the critical quenching diameter in water is 6~29MM. In addition, the steel has high cold deformation molding, good weldability, and good machinability in the annealed state.

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【Chemical Composition】(Mass Fraction)(%)

碳 C ：0.12~0.18

硅 Si：0.17~0.37

锰Mn：0.40~0.70

硫 S ：允许残余含量≤0.035

磷 P ：允许残余含量≤0.035

铬 CR：0.70~1.00

Nickel Ni: allowable residual content≤0.030

铜 Cu：允许残余含量≤0.030