摘要
18CrNiM07-6钢(/%:0.17C、0.59Mn、0.24Si、1.56Ni、1.71Cr、0.28Mo)为表面硬化齿轮钢要求正火后钢的组织为铁素体+珠光体和较低的HB硬度值。18CrNiM07-6钢连续冷却后易得到高硬度的贝氏体组织。通过实验室高温箱式电阻炉试验表明,870～900℃1 h-640～660℃4 h炉冷至300℃,空冷,该钢的组织为铁素体+珠光体+贝氏体组织,HB硬度值为340～350;而870～900℃1 h,30℃/h至640～660℃,炉冷至300℃,空冷,该钢的组织为铁素体+珠光体,HB硬度值为190～210:生产试验表明,30 tΦ180 mm 18CrNiM07-6钢锻材经900℃10 h,≤30℃/h至650℃25 h,30℃/h至500℃空冷,可获得铁素体+珠光体组织。
Tested steel 18CrNiMo7-6 （/% ： 0. 17C, 0. 59Mn, 0. 24Si, 1.56Ni, 1.71Cr, 0. 28Mo） is a case-hard- ening steel for gear, it is required that the structure of normalized steel is ferrite ＋ pearlite and has lower HB hardness val- ue. The higher hardness bainite strueture is easily obtained in steel 18CrNiMo7-6 after continuous cooling. The tested re- sults by high temperature chamber electric resistance furnace in laboratory show that with 870 - 900 ℃ 1 h-640 - 660 ℃ 4 h furnace cooling to 300 ℃ air cooling the structure of steel is ferrite ＋ pearlite ＋ bainite with HB hardness value 340 - 350, while with 870 -900 ℃ 1 h, 30℃/h cooling to 640 -660℃ furnace cooling to 300 ℃ air cooling the structure of steel is ferrite ＋ pearlite with HB hardness value 190 - 210. The commercial production test results show that with 900 10 h, ≤30 ℃/h cooling to 650 ℃ 25 h, then 30 ℃/h cooling to 500℃ air cooling for 30 t O180 mm finished forged products the structure of steel 18CrNiMo7-6 has ferrite ＋ pearlite structure.
出处
《特殊钢》
北大核心
2013年第1期66-68,共3页
Special Steel
作者简介
刘金鑫（1978-），男，硕士，工程师，2009年辽宁科技大学毕业，结构钢研发。
