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
m
721~745 N/mm
2
屈服强度R
eH
463~470 N/mm
2
伸长率A
5
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