50t EBT EAF-LF(VD)-CC流程冶炼25MnB钢终点B控制的工艺实践  

Process Practice for End B Control of Steel 25MnB Steelmaking by 50t EBT EAF-LF(VD)-CC Flow Sheet

作　　者：杨钢铁[1] 

机构地区：[1]南通宝钢钢铁有限公司,南通226002

出　　处：《特殊钢》2014年第2期37-39,共3页Special Steel

摘　　要：通过电弧炉配加25~36 t/炉铁水,出钢加100 kg铝铁预脱氧,LF精炼过程精炼渣碱度≥4,喂Al线(目标0.015%Al)后加钛铁(目标0.04%Ti),VD后加硼铁,软吹氩5~10 min,连铸全程保护浇铸等工艺措施,25炉25MnB钢(/%:0.23~0.28C,0.15~0.35Si,1.00~1.30Mn,0.000 5~0.003 0B,≤0.065Ti)Φ180 mm圆坯的O含量为8×10^(-6)~13×10^(-6),N含量为30×10^(-6)~49×10^(-6),B含量0.001 5%~0.002 4%,B的回收率可达90%,有效地改善了B的控制精度和25MnB钢成品B的命中率。With the process measures including EAF charging hot metal 25 -36 t/heat, during tapping adding 100 kg ferroaluminium to pre-deoxidizing, controlling refining slag basicity 1〉 4 during LF refining, after feeding A1 wire （ aim 0. 015%A1） adding ferrotitanium （aim 0. 04%Ti） , after VD adding ferroboron and soft argon blowing for 5 - 10 min, and whole process shielding casting, the 25 heats production results show that in ~180 mm round billet of steel 25MnB （/% ： 0. 23 - 0. 28C, 0. 15- 0. 35Si, 1.00 - 1.30Mn, 0. 000 5 ～0. 003 0B, ≤0. 065Ti） the oxygen content is 8 ×10 -6 ～ 13 × 10 -6, the nitrogen content is 30 × 10 -6 49× 10 -6 and the boron content is 0.001 5% ~ 0.002 4%, and the yield of bo- ron is up to 90% , it is available to improve the control extent of boron content and the hitting accuracy of B in finishing steel 25MnB.

关 键 词：50 t EBT EAF-LF(VD)-CC流程 25MnB钢 B含量控制 工艺实践 

分 类 号：TF703[冶金工程—钢铁冶金]