300 mm x300 mm EA4T车轴钢坯生产工艺实践

特殊钢 ›› 2012, Vol. 33 ›› Issue (1): 38-40.

300 mm x300 mm EA4T车轴钢坯生产工艺实践

张春红, 杨接明, 唐雪萍

首钢贵阳特殊钢有限责任公司技术中心，贵阳550005

收稿日期:2011-09-05 出版日期:2012-02-01 发布日期:2022-09-20
作者简介:张春红（1971-）,女，主任工程师，硕士，1993年北京科技大学毕业，锻造工艺研究及产品标准管理。
基金资助:
国家科技支撑计划，编号2007BAE11B01 ；黔科合重大专项，编号20066031

Practice of Production Process for 300 mm x 300 mm EA4T Axle Steel Bloom

Zhang Chunhong, Yang Jieming, Tang Xueping

Technology Center, Shougang-Guiyang Special Steel Co Ltd, Guiyang 550005

Received:2011-09-05 Published:2012-02-01 Online:2022-09-20

摘要/Abstract

摘要： EA4T车轴钢(/%:0.22～0.29C、0.15～0.40Si、0.50～0.80Mn、≤0.020P、≤0.015S、0.90～1.20Cr、0.15～0.30Mo、≤0.06V)采用30 t EBT电弧炉40 t LF/VD-5 t铸锭工艺生产,并经8 MN油压机锻成300 mm x300mm钢坯,锻造比≥9。结果表明,EA4T钢[O]为(12-15)×10^-6,[H]为(1.2～1.6)×10^-6,经900～920℃淬火,600～650℃回火后,抗拉强度R_m721~745 N/mm²,屈服强度R_eH463～470 N/mm²,伸长率A₅ 19.0%～19.5%,纵向冲击功53～73 J,横向冲击功36～41 J,组织为贝氏体一回火马氏体,10~7循环疲劳极限为350 N/mm~2。

Abstract: The EA4T axle steel (/% ： 0. 22 ~ 0. 29C, 0. 15 ~ 0. 40Si, 0. 50 ~ 0. 80Mn, ≤0. 020P, ≤0. 015S, 0. 90 ~ 1. 20Cr, 0. 15 ~0. 30Mo, ≤0. 06V) is produced by 30 t EBT arc furnace-40 t LF/VD-5 t ingot process and forged by 8MN oil-hydraulic press to 300 mm x300 mm bloom with forging ratio ≥9. Results show that of the EA4T steel, [0] is (12 ~ 15) x 10^-6, [ H] is (1. 2 ~ 1. 6) x 10^-6, with quenching at 900 - 920 °C and tempering at 600 ~650 °C, tensile strength R_m721 ~745 N/mm², yield strength R_eH 463 ~470 N/mm², elongation A₅ 19. 0% ~ 19. 5%, longitudinal impact energy 53 ~73 J, transverse impact energy 36 ~41 J, structure is bainite-tempered martensite, and 10⁷ cycle fatigue limit is 350 N/mm².

张春红, 杨接明, 唐雪萍. 300 mm x300 mm EA4T车轴钢坯生产工艺实践[J]. 特殊钢, 2012, 33(1): 38-40.

Zhang Chunhong, Yang Jieming , Tang Xueping. Practice of Production Process for 300 mm x 300 mm EA4T Axle Steel Bloom[J]. Special Steel, 2012, 33(1): 38-40.