What are the precautions for use of JIS SM400A HSLA steel coil
JIS SM400A HSLA steel coil and so on steel structure engineering steel has good plasticity, which can make the structure have obvious deformation before being destroyed, so as to avoid brittle failure of structure. The good plasticity of steel can adjust the local peak stress to redistribute the stress, and improve the ductility of components, so as to improve the seismic capacity of the structure. The impact toughness of JIS SM400A HSLA steel coil and so on steel structure engineering steel is good, which can improve the ability of resisting dynamic load and avoid the occurrence of cracks and brittle fracture.
A514 gr.B steel coil chemical composition (melting analysis)%C: 0.12-0.21, Si: 0.20-0.35, Mn: 0.70-1.00, P max.: 0.035, S max.: 0.035, B max.: 0.005, Cr: 0.40-0.65, Mo: 0.15-0.25, V: 0.03-0.08, Ti: 0.01-0.03The mechanical properties in thickness (mm)T≤65Yield strength (≥Mpa): 690Tensile strength (Mpa):760-895Elongation in ≥, %: 18
Tempering includes high temperature tempering, medium temperature tempering and low temperature tempering. Tempering means to reheat the JIS SM400A HSLA steel coil quenched steel to a certain temperature and then cool it in a certain way. Tempering can reduce or eliminate the internal stress produced by quenching, reduce the hardness and strength, and improve the ductility or toughness of steel. After JIS SM400A HSLA steel coil quenching, the workpiece should be tempered in time, and the required mechanical properties can be obtained through the combination of quenching and tempering.
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