摘要
S500Q-Z35钢（%：0.13C,0.25Si,0.007P,0.001S,0.010A1,0.39Cr,0.92Ni,0.44Mn,0.02Nb,0.01Ti,0.54Ceq）245 mm板由KR脱硫铁水-120 t转炉-LF-VD-42t模铸-轧制-热处理工艺生产。根据控制钢的晶粒长大原理,测定的CCT曲线和临界厚度,以及工艺试验,得出S500Q-Z35钢245 mm特厚板经快速升温至930℃,保温2.0min/mm,快冷至670℃的预淬火,快速升温至880℃,保温2.4 min/mm,循环水＋气体搅拌冷至室温的亚温淬火,620~630℃,保温4 min/mm,空冷至400℃压平的回火处理,钢板表面组织为索氏体,其他部位为回火贝氏体＋铁素体,具有良好的综合机械性能,钢板Z向性能良好。
245 mm plate of steel S500Q-Z35（/%：0.13 C,0.25 Si,0.007 P,0.001 S,0.010A1,0.39 Cr,0.92 Ni,0.44 Mo,0.02 Nb,0.01 Ti,0.54Ceq） is produced by KR desulphurized hot metal-120 t BOF-LF-VD-42 t ingot castingrolling-heat treatment process.According to principle of control of grain growth,the measuring CCT curves and critical thickness,as well as process test are carried out,it is obtained that with pre-quenching process-rapidly heating to 930 ℃for 2.0 min/mm,quickly cooling to 670 ℃,the sub-critical quenching-rapidly heating to 880 ℃ for 2.4 min/mm,with circle water ＋ gas stirring cooling to ambient,and tempering treatment at 620 ~ 630 ℃ for 4 min/mm,air cooling to 400 ℃and flatting,the surface structure of 245 mm heavy plate of steel S500Q-Z35 is sorbite,the structure in other parts is tempered bainite ＋ ferrite,it has better comprehensive mechanical properties and has better properties of plate Z-direction.
出处
《特殊钢》
北大核心
2015年第3期34-37,共4页
Special Steel
