Study on Properties of New Cold Working Die Steel 9Cr5Mo2V under Different Heat Treatments
Taking the new cold working die steel 9Cr5Mo2V as research object,through the influence law of quenching and tempering temperature on hardness,five different heat treatment processes were selected.The transverse and longitudinal impact toughness,bending strength and wear resistance of the die steel under different processes were compared with that of 7Cr5Mo2V steel.The results show that 9Cr5Mo2V steel has excellent hardness(63.6 HRC)and wear resistance(260.16 min/mm3)under 1030℃ quenching and 520℃ tempering,and the longitudinal average impact energy is the highest,it reaches 62.83 J after 970℃ quenching and 520℃ tempering heat treatment.After heat treatment at 970℃ quenching and 210℃tempering heat treatment,9Cr5Mo2V steel has excellent bending resistance,the longitudinal flexural strength is 3621.9 MPa.The longitudinal impact energy and flexural strength of 9Cr5Mo2V steel are higher than those of transverse.
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