转炉生产矿用链23MnNiMoCr54钢的工艺实践及研究  

Process practice and research on 23MnNiMoCr54 steel for mining chain produced by converter

作　　者：毛威昂 崔政 王瑞 刘广磊 王刘艳 Mao Weiang;Cui Zheng;Wang Rui;Liu Guanglei;Wang Liuyan(R&D Department,Jianlong Beiman Special Steel Co.,Ltd.,Qiqihar 016000,Heilongjiang,China)

机构地区：[1]建龙北满特殊钢有限责任公司研发部,黑龙江齐齐哈尔016000

出　　处：《特钢技术》2024年第2期17-21,共5页Special Steel Technology

摘　　要：主要介绍了转炉→精炼→真空→连铸→轧前加热→轧制生产矿用链23MnNiMoCr54钢的工艺实践及研究,采用双渣法控制倒渣、脱磷,转炉出钢w(P%)≤0.005%,精炼炉渣碱度在5.80-6.02时Mn合金收得率较高、软吹时间控制25~30min氧化铝类夹杂物最少。在生产前依据JMatPro热力学软件模拟出钢的平衡相组成图和CCT曲线设计出钢温度和退火温度,热轧态组织为贝氏体,通过具有还原性气氛的双蓄式步进2#加热炉退火后为粒状珠光体。连铸坯总体元素偏析指数在0.91~1.07,未发现存在圈状低镍区,质量良好。非金属夹杂物A类、D类和大颗粒DS类夹杂物分别为0.5级,B细0~0.5级,其余均为0级,晶粒度在退火后由热轧态的7.5~8.0级全部转变为8.0级,各项性能指标均满足标准要求。This article mainly introduces the process practice and research of converter→refining→vacuum→continuous casting→heating pre rolling→rolling production of 23MnNiMoCr54 steel for mining chain.The dual slag method is used to control slag pouring and dephosphorization,and the converter output w(P%)is≤0.005%.When the alkalinity of the refining slag is between 5.80-6.02,the yield of Mn alloy is higher,and the soft blowing time is controlled for 25-30 minutes to minimize alumina inclusions.Before production,the equilibrium phase composition diagram and CCT curve of the steel were simulated using JMatPro thermodynamic software to design the steel tapping temperature and annealing temperature.The hot-rolled microstructure is bainite,and after annealing in a double storage step 2#heating furnace with a reducing atmosphere,it becomes granular pearlite.The overall element segregation index of the continuous casting billet is between 0.91 and 1.07,and no circular low nickel zone was found,indicating good quality.Non metallic inclusions of class A,class D,and large particle DS are 0.5 grade,B class fine type is 0~0.5 grade,and the rest are 0 grade.The grain size changes from 7.5~8.0 grade in the hot-rolled state to 8.0 grade after annealing,and all performance indicators meet the standard requirements.

关 键 词：矿用链23MnNiMoCr54钢 合金 生产工艺 实践 

分 类 号：TF033[冶金工程—冶金物理化学]