李博鹏, 王占忠, 柳萍, 等. 120 t BOF-LF-RH-410 mm x530 mm 大方坯连铸 18CrNiMo7-6 钢的工艺实践[J]. 特殊钢, 2019,40(3):32-34.
李博鹏, 王占忠, 柳萍, et al. Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting[J]. Special Steel, 2019, 40(3): 32-34.
李博鹏, 王占忠, 柳萍, 等. 120 t BOF-LF-RH-410 mm x530 mm 大方坯连铸 18CrNiMo7-6 钢的工艺实践[J]. 特殊钢, 2019,40(3):32-34.DOI:
李博鹏, 王占忠, 柳萍, et al. Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting[J]. Special Steel, 2019, 40(3): 32-34.DOI:
120 t BOF-LF-RH-410 mm x530 mm 大方坯连铸 18CrNiMo7-6 钢的工艺实践
采用铁水+废钢-120 t转炉-LF-RH-410 mm×530 mm大方坯连铸-步进式加热炉-750轧机轧制-退火的流程生产规格Φ115~250 mm 18CrNiMo7-6(/%:0.15~0.19C
0.25~0.40Si
0.40~0.60Mn
1.50~1.80Cr
1.40~1.70Ni
0.25~0.35Mo
≤0.020P
≤0.020S
0.020~0.040Al
0.0100-0.0200N)。通过控制出钢预脱氧和合金化
深真空时间≥15 min
软吹氮气
控制中间包钢水过热度
拉速0.48 m/min
全过程Ar气保护
连铸M-EMS和F-EMS
轧制后退火等工艺措施
生产的产品宏观夹杂物检测含量≤20mm/dm
3
碳中心偏析指数≤1.10
晶粒度≥7级
钢材各项指标满足协议要求。
Abstract
The steel grade 18CrNiMo7-6 with diameter of Φ115 ~250 nun round from process route of hot metal + scrap-120 t BOF-RH- 410 mm x530 mm continuous casting-bloom heating by walking forward heating fumace-750 rolling¬annealing. Its chemical composition is (/% : 0. 15 ~ 0. 19C
0. 25 ~ 0. 40Si
0. 40 ~ 0. 60Mn
1.50 ~ 1. 80Cr
1.40 ~ 1.70Ni
0.25 ~0. 35Mo
W0. 020P
W0. 020S
0.020 ~ 0. 040Al
0.0100 ~ 0.0200N). Through deoxidization and alloy addition during tapping
deep vacuum degassing not less than 15 minutes
soft bubbling with Nitrogen
super heat control in tundish
casting speed of 0. 48 m/min
full process argon protection and applications of F-EMS and M-EMS
annealing after rolling etc.
the final product
'
s macro-inclusion not more than 20 mm/dm
3
carbon center segregation not more than 1. 10 and grain size finer than 7