45圆钢热顶锻裂纹原因分析陈瑜.pdf

29 5 Vo l. 29 , N o. 5 2011 9 Physics Examinat ion and T esting Sept emper 2011 45 1 2 2 2 2 陈 瑜 , 王建忠, 李 娜 , 祁立国, 张 浩 1. , 050000 ; 2 . , 075100) : 4 5 , , , , : 45 ; ; : A : 100 1- 0777 20 11) 05- 00 33- 03 Analysis on the Crack of 45 Round Steel of Xuanhua Steel During Hot Forging 1 2 2 2 2 CH EN Y u , WA N G Jian- zhong , L I N a , QI L-i guo , ZH A N G H ao 1. H ebei Iro n and Steel T echno log y R esear ch Institute, Shij iazhuang 050000 , Hebei, China; 2 . H ebei Iro n and Steel G roup Co . , Lt d. , Xuanhua Steel, Xuanhua 075 100, Hebei, China) A stract: By analyzing cr ack samples of hot for ging for 45 r ound steel fro m both macr o and micr o, it can be fo und that the cr ack w as mainly cau sed by fo lding, and lo cal surf ace decarburizatio n o f ro und steel shar pened the crack o f ho t for ging . By implementing r eg ulations on ov erhaul and rolling strictly, and optimizing heating instit ution , the cr ack o f ho t for ging could be pr ev ented . Key words:4 5 r ound steel; hot for g ing ; fo lding 45 , , , , , , , 45 , 4 5 , , [ 1] 1 试样检验 1 , 45 Fig. 1 Macroscopic appearance of crack , 30 mm 1. 2 1. 1 1 1, 45 , , 1. 3 , , , 5 m m, 8 mm , 2