Manufacturing method for multi-component alloying steel with high strength and high wear-resistance and hot rolled plate thereof

Abstract

This invention provides a manufacturing method of a multi-component alloying steel with high strength and high wear-resistance and a hot rolled plate thereof. The weight percentages of the chemical composition of the wear-resistant steel above is as follows: C: 1.0-1.2%, Si: 0.6-1.0%, Mn: 8.0-10.0%, P<0.02%, S<0.02%, Cr: 1.5-2.5%, Mo: 0.2-0.5%, V: 0.6-1.0%, Nb: 0.02-0.06%, Ti: 0.01-0.1%, Al: 0.03-0.08%, and the rest are Fe and unavoidable impurities. The manufacturing process of the hot rolled plate of the wear-resistant steel includes the steel making, continuous casting, heating, hot rolling and heat treatment.

1 - 10 . (canceled) 
     
     
         11 . A multi-component alloying steel with high strength and high wear-resistance, wherein a composition of the steel comprises:
 1.0-1.2 wt % of C;   0.6-1.0 wt % of Si;   8.0-10.0 wt % of Mn;   <0.02 wt % of P;   <0.02 wt % of S;   1.5-2.5 wt % of Cr;   0.2-0.5 wt % of Mo;   0.6-1.0 wt % of V;   0.02-0.06 wt % of Nb;   0.01-0.1 wt % of Ti;   0.03-0.08 wt % of Al; and   Fe and unavoidable impurities, which account for the rest amount of the composition.   
     
     
         12 . The steel of  claim 11 , wherein a content of the C is 1.01-1.19 wt %. 
     
     
         13 . The steel of  claim 11 , wherein a content of the Si is 0.61-0.98 wt %. 
     
     
         14 . The steel of  claim 11 , wherein a content of the Mn is 8.02-9.99 wt %. 
     
     
         15 . The steel of  claim 11 , wherein a content of the Cr is 1.55-2.47 wt %, and a content of the Nb is 0.02-0.06 wt %. 
     
     
         16 . The steel of  claim 11 , wherein a content of the Mo is 0.22-0.49 wt %, and a content of the Ti is 0.03-0.09 wt %. 
     
     
         17 . The steel of  claim 11 , wherein a content of the V is 0.61-0.98 wt % and a content of the Al is 0.03-0.07 wt %. 
     
     
         18 . A method of manufacturing a hot rolled plate of the steel of  claim 11 , the method comprising:
 performing a steel making step to the steel;   performing a continuous casting step to the steel at a temperature of 1370-1390° C. to obtain a slab;   performing a heating step to the slab, wherein a holding temperature of the slab is 1160-1200° C.;   performing a hot rolling step to the slab, wherein a rolling temperature of the slab is 1000-1180° C.; and   performing a heat treatment to the slab, wherein the heat treatment comprises a water toughening step started at a temperature of 1000-1070° C. and stopped at a temperature of 200-300° C.   
     
     
         19 . A hot rolled plate formed by the method of  claim 18 , wherein the hot rolled plate having properties below:
 a tensile strength of more than 900 MPa;   a yield strength of more than 480 MPa;   an impact energy (Akv) of more than 100 J at 25° C. and 40-50 J at −40° C. obtained by V-notch impact test; and   a Brinell hardness of 220-240 HB.   
     
     
         20 . The hot rolled plate of  claim 19 , wherein the hot rolled plate further has a wear rate of ≤20×10 −6  mm 3 /N·m under 200 N load sliding wear condition.