MANUFACTURE OF HIGH STRENGTH AND TOUGHNESS THICK STEEL PLATE WITH ADDED BORON BY DIRECT QUENCHING PROCESS,申请号JP19850278018-传众专利搜索

MANUFACTURE OF HIGH STRENGTH AND TOUGHNESS THICK STEEL PLATE WITH ADDED BORON BY DIRECT QUENCHING PROCESS

申请公布号：JPS62139815(A)

申请号：JP19850278018

申请日期：1985.12.12

申请公布日期：1987.06.23

申请人：

KAWASAKI STEEL CORP

发明人：IMANAKA MAKOTO;TERAJIMA HISAE;SHIGA CHIAKI

分类号：C21D8/00;C21D8/02;C22C38/00;C22C38/06

主分类号：C21D8/00

摘要：PURPOSE:To manufacture thick steel plate superior in strength and toughness, by hot rolling low alloy steel material with B added having a specified compsn. under a specified condition, thereafter, heat treating the plate. CONSTITUTION:Slab of low alloy steel with B added contg. by weight, 0.04-0.15% C, 0.01-0.30% Si, 0.10-2.0% Mn and 0.02-0.15% Al, 0.0003-0.0030% B, 0.0010-0.100% N under Al(%)XN(%)>10<-4> and B(%)XN(%)>2.5X10<-6> of further one or >=2 kinds among <0.6% Cu, <3.0% Ni, <0.7% Cr, <0.7% Mo, <0.1% V, <2.0% Nb, <0.1% Ti is heated to 1,180-1,300 deg.C. This is hot rolled to thick steel plate so that rolling is finished at >=850 deg.C, the plate is held at temp near rolling finish temp., or held at >=850 deg.C temp. range during cooling after hot rolling for the lapse of 1-6min, then rapidly cooled to <=300 deg.C, then temper treated.