Research and development of low cost and high toughness NM500 steel plate
Through the alloy reduction design on the basis of ordinary NM500 alloy,combined with high purity smelting and reasonable heat treatment,a low cost NM500 steel plate with easy welding,good comprehensive mechanical properties and wear resistance was successfully developed.The full thickness microstructure of low cost NM500 steel plate was lath martensite with the effective grain size of 1.94 μm,and the proportion of high angle grain boundary was 71.6％.The HV hardness of low cost NM500 steel plate was between 500-520 with the yield strength,the tensile strength and the elongation of 1 222 MPa,1 583 MPa and 9.6％,respectively.The impact energy of low cost NM500 steel plate at-40 ℃ was 58.8 J.Its wear resistance was the same as that of ordinary NM500 steel plate,and the morphology was composed of grooves and a small amount of spalling pits.For the structure that can be completely quenched,the alloy reduction has little effect on the structure and properties.
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