摘要
Q345E钢（／％：0．14—0．17C、0．20～0．30Si、1．28～1．38Mn、≤0．011P、≤0．005S、0．015。0．030A1、0．032～0．045V）大圆坯的生产流程为65tLD—LF—VD．Ф600mm圆坯cc工艺。通过出钢时滑板挡渣，加入预熔合成渣（／％：40—50CaO、≤9Si02、30—40A1203、3—7MgO、8—10A1）、钢芯铝、脱氧剂和合金，控制拉速0．22m／min，32t中间包钢水过热度（25±5）℃，恒液面900mm，全程保护浇铸和电磁搅拌等措施，试生产法兰用Q345E钢Ф600mm连铸圆坯。生产结果表明，铸坯表面无可见冷疤、鼓肚等缺陷，中心缩孔0．5级，中心疏松1．0级，碳偏析≤1．09，-50℃低温冲击功超过100J，完全满足标准要求。
The production flow sheet for heavy bloom of steel Q345E （/% ： 0. 14 -0. 17C, 0. 20-0. 30Si, 1.28 1.38Mn, ≤0. 011P,≤0. 005S, 0. 015 - 0. 030A1, 0. 032 - 0. 045V） is 65 t LD-LF-VD-Ф300 mm round bloom CC process. With the measures including using sliding plate to stop slag in tapping, and adding pre-melted synthetic slag （/% ： 40 - 50CaO, ≤9SiO2, 30 - 40A12 03, 3-7MgO, 8- 10A1） , steel-clad aluminium, deoxidizer and alloys, control- ling casting speed O. 22 m/min, overheating extent of liquid （25- 5 ） ℃ and constant liquid level 900 mm in 32 t tundish, whole process shield casting and electromagnetic stirring, the Ф600 mm casting round bloom of steel Q345E for flange is pi- lot-produced. The production results show that there is no visible surface defect such as scab and bulging, the rating of cen- ter line shrinkage is O. 5, the center porosity 1.0 and the carbon segregation ≤1.09, and the impact energy of steel at - 50 ℃is more than 100 J, all meet the requirement.
出处
《特殊钢》
北大核心
2013年第5期54-56,共3页
Special Steel
