M2高速钢Φ183mm锻坯针孔缺陷分析和工艺改进  

Analysis on Pinhole Defect of Φ183 mm Forged Billet of High Speed Steel M2 and Process Improvement

作　　者：尤晓东 郝世风 邵青立 何宁 

机构地区：[1]河冶科技股份有限公司,石家庄052165

出　　处：《特殊钢》2016年第1期50-53,共4页Special Steel

摘　　要：M2高速钢（/%：0.86C,0.39Si,0.32Mn,0.015P,0.006S,6.00W,4.00Cr,4.80Mo,1.85V）Φ183 mm圆坯由2.0 t电渣锭（Φ~500 mm）锻制而成。M2钢锻坯探伤缺陷率为33.33%~69.23%,主要为中心部位针孔缺陷。分析表明,针孔缺陷是钢锭偏析部位在开坯加热和锻制过程中产生过热形成的。通过将电渣重熔电流由8 000→6 800 A降至7 000→6 000 A,降低电渣重熔速度,开锻温度由1070~1090℃降至1030~1060℃,终锻温度由960~980℃C降至900~950℃以降低中间坯的中心温度等工艺措施,使M2钢Φ183 mm锻坯的探伤缺陷率由50%降低到5.71%。The Φ183 mm round billet of high speed steel M2（/%：0.86 C,0.39 Si,0.32 Mn,0.015 P,0.006 S,6.00 W,4.00 Cr,4.80 Mo,1.85V） is forged from 2.0 t ESR ingot（Φ500 mm）.The nondestructive detect defect ratio of forged billet of steel M2 is 33.3%~ 69.23%and the main defect is pinhole at center position of billet.Analysis results show that due to producing overheating of billet during heating and forging process the segregation of ingot forms pinhole defect.With process measures including decreasing the ESR current from 8 000→6 800 A to 7 000→6 000 A to decrease remelting speed,decreasing the beginning forging temperature from 1 070 ~ 1 090 ℃ to 1 030 ~ 1 060 ℃ and decreasing the end forging temperature from 960 ~ 980 ℃ to 900 ~ 950 ℃ to decrease the center temperature of forging billet,the nondestructive detective defect ratio of Φ183 mm forged billet of steel M2 decreases from 50%to 5.71%.

关 键 词：M2高速钢 2t电渣锭 Φ183mm锻坯 偏析 过热 针孔缺陷 

分 类 号：TG115[金属学及工艺—物理冶金]