N含量对硼钢35MnB末端淬火性能的影响  

Effect of N Content on End-Quenching Property of Boron Steel 35MnB

作　　者：杨高成 孙鸿平 

机构地区：[1]江阴兴澄特种钢铁有限公司,江阴214429

出　　处：《特殊钢》2011年第5期51-52,共2页Special Steel

摘　　要：35MnB钢由40 t EAF-LF-VD-180 mm×180 mm连铸的电弧炉流程和100 t BOF-LF-RH-200 mm×200mm连铸转炉流程冶炼。35MnB钢技术协议要求J19 HRC值为33～41。试验结果表明,电弧炉流程生产的35MnB钢J19HRC值为25～28,转炉流程生产的35MnB钢末端淬火试验J19HRC值为36～41。对比分析了电弧炉流程和转炉流程生产的35MnB钢的末端淬火性能。分析得出,电弧炉流程生产的35MnB钢中的平均N含量高达(80～90)×10、转炉流程为(45～50)×10^(-6),电炉钢中高N含量影响了B对提高钢材淬透性的作用,为了保证钢材末端淬火性能,应控制钢中N含量≤50×10^(-6)。Steel 35MnB is melted by 40 t EAF-LF-VD-180 mm ×180 mm billet CC arc furnace flow sheet and 100 t BOF-LF-RH-200 mm× 200 mm billet CC Converter flow sheet. The requirement of technical specifications for steel 35MnB is end-quenching hardenability J19 HRC value is 33 - 41. Examination results show that the J19 HRC value of steel 35MnB produced by arc furnace flow sheet is 25 -28, and the J19 HRC value of steel 35MnB produced by converter flow sheet is 36 - 41. The end-quenching hardenabilities of steel 35MnB produced by arc furnace flow sheet and converter flow sheet have been compared and analyzed. It is obtained by analysis that the average N content in steel 35MnB produced by arc furnace reaches （80-90） × 10^-6 and that produced by converter is （45-50） ×10^-6, the high N content in EAF steel influences the effect of B to improve hardenability of steel products, in order to ensure the end-quenching properties of steel products, the N content in steel should be controlled ≤50 × 10^-6.

关 键 词：EAF—LF—VD—CC BOF—LF-RH-CC N含量 硼钢35MnB 末端淬火 淬透性 

分 类 号：TG156.3[金属学及工艺—热处理]