High pressure gas cylinder made of 34CrMo4 seamless steel tube prepared by flip plate spinning forming was treated by quenching+subcritical quenching+tempering,and then microstructure and mechanical properties of the cylinder head before and after heat treatment were studied by metallographic observation and tensile test.The results show that the grain size of the material is obviously refined by the heat treatment,and the coarse ferrite+sorbite structure in the cylinder head is transformed into fine tempered sorbite structure.After heat treatment,the tensile strength and yield strength of the cylinder head are improved,the yield ratio is reduced,and the plasticity of the cylinder is improved.It is proved that the heat treatment process of quenching+subcritical quenching+tempering is beneficial to optimize the microstructure and improve the mechanical properties of high-pressure gas cylinder made of 34CrMo4 steel.
34CrMo4 steelhigh-pressure gas cylinderheat treatmentmicrostructuremechanical properties
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