α-相对2.625t 1Cr18Ni9Ti不锈钢锭初轧坯表面质量的影响

Effect ofα-Phase on Bloom Surface Quality of 1Cr18Ni9Ti Stainless Steel 2.625t Ingot

生产实践表明,1Cr18Ni9Ti奥氏体不锈钢α-相数量(级别)是影响2．625 t钢锭初轧坯表面质量的主要因素,当钢中α-相超过2．5级[α-相含量(面积)=12％]时,钢坯表面质量急剧下降。当钢中C为0．08％、(Cr+ 3．28Ti)／Ni≤2,钢锭均热温度≤1 270℃时,钢中α-相≤2．5级,可得到良好表面质量的轧坯。为获得较好的轧坯表面质量,应控制钢中Ti≤0．70％、电渣母材的Ti≤0．80％。

Production practice indicated that the amount （rating） of α-phase in 1Crl8Ni9Ti austenite stainless steel was principal factor to influence bloom surface quality of 2. 625 t ingot, and as α-phase rating was more that 2. 5 corresponding to α-phase content （area） = 12%, the surface quality of bloom rapidly decreased. As C% in steel was 0. 08%, （Cr ＋3.28Ti）/Ni≤2, and ingot pit temperature ≤1 270 ℃, the rating of α-phase in steel was ≤2.5 to get excellent surface quality of bloom. For obtained nice surface quality of bloom it should be to control Ti content in steel≤0. 70%, and in ESR electrode Ti≤0. 80%.