高压锅炉管用钢P11 Φ250～350mm连铸圆坯的开发  

Development of Φ250～350 mm Casting Round Bloom of Steel Pll for High Pressure Boiler Pipe

作　　者：尹修刚 姚忠 王社教 

机构地区：[1]承德建龙特殊钢有限公司研发处,承德067201 [2]武汉钢铁集团鄂城钢铁有限责任公司,鄂州436000

出　　处：《特殊钢》2016年第6期41-43,共3页Special Steel

摘　　要：开发的P11钢（/%：0.08～0.14C,0.65～0.85Si,0.40～0.60Mn,≤0.010P,≤0.010S,1.10～1.30Cr,0.46～0.60Mo,≤0.015Alt）连铸圆坯的生产流程为KR铁水预处理-70 t顶底复吹转炉-LF-VD-圆坯连铸工艺。通过控制/%：0.09～0.11C,1.15～1.20Cr,0.07～0.08P,0.002～0.005S,0.008～0.015Als,中间包钢液温度（1 538±5）℃,连铸拉速0.70～1.05 m/min,二次冷却比水量0.35～0.40 L/kg,矫直温度≥900℃,缓冷坑温度≥500℃等工艺措施,检验结果表明,铸坯表面质量合格,缩孔≤0.5级,中心疏松≤1.0级,钢P含量为0.007%～0.008%,S含量0.002%～0.005%,该钢在工作温度下有较好的耐流动加速腐蚀性（FAC）。The production flowsheet for developed casting round bloom of steel P11 （/% ：0. 08 - 0. 14C, 0. 65 - 0. 85Si, 0. 40 -0. 60Mn, ≤0. 010P, ≤0. 010S, 1.10 - 1.30Cr, 0. 46 -0. 60Mo, ≤0. 015Alt） is KR metal pretreatment- 70 t top and bottom combined blown converter- LF- VD- round bloom casting process. With using the measures inclu- ding controlling the elements content/% ： 0. 09 -0. 11C, 1.15 - 1.20Cr, 0. 07 -0. 08P, 0. 002 -0. 005S and 0. 008 ～ 0. 015Als, controlling tundish liquid temperature （ 1 538 ± 5 ）℃ , casting speed 0. 70 - 1.05 m/min, secondary cooling water ratio 0. 35 - 0. 40 L/kg, strengthening temperature ≥900℃ and temperature of slow cooling pit furnace ≥500 ℃ , the examination results show that the surface quality of casting bloom is qualified with rating of shrinkage cavity ≤0. 5 and rat- ing of central porosity ≤ 1.0, the P content in steel is 0. 007% -0. 008% and the S content in steel is 0. 002% 0. 005%, so the steel has better flowing accelerating corrosion （FAC） resistance at service temperature.

关 键 词：70 t BOF-LF-VD-CC流程 高压锅炉管 P11钢 Φ250~350 mm连铸圆坯 耐流动加速腐蚀性 

分 类 号：TF777[冶金工程—钢铁冶金]