塑料模具用1.2311预硬化特厚钢板的研制  

Development of Pre-hardened and Ultra-thick 1.2311 Steel Plate Used for Plastic Mold Steel

作　　者：韩飞[1,2] 梁健[3] 鲍思前 周练[4] Han Fei;Liang Jian;Bao Siqian;Zhou Lian(Faculty of Materials Science,Wuhan University of Science and Technology,Wuhan 430081,China;Hunan Valin Xiangtan Iron and Steel Co.,Ltd.,Xiangtan 411101,China;Guangdong Xiongfeng Mold Steel Material Technology Co.,Ltd.,Foshan 528311,China;School of Architecture and Art Design,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]武汉科技大学材料学部,武汉430081 [2]湖南华菱湘潭钢铁有限公司,湘潭411101 [3]广东雄峰模具钢材料科技有限公司,佛山528311 [4]湖南科技大学建筑与艺术设计学院,湘潭411201

出　　处：《特殊钢》2025年第2期43-47,共5页Special Steel

摘　　要：基于国内外市场需求,介绍了塑料模具用1.2311预硬化特厚钢板的研制过程。对1.2311钢进行了连续相变行为试验研究,并绘制出静态连续冷却转变曲线。经KR预处理→120 t转炉(留渣法冶炼控制碳含量0.20%~0.30%)→LF(精炼吹氩时间保持≥60 min)→VD(真空度不高于67 Pa,真空保持时间≥20 min)→450 mm板坯连铸(过热度8~15℃、拉速0.45 m/min)→板坯加热→5000 mm轧机轧制(粗轧末3道次压下量之和≥140 mm)→860~890℃正火→ACC控制冷却(水冷、空冷结合)→550~610℃回火,成功研制出≥150 mm规格塑料模具用1.2311预硬化特厚钢板。结果表明,全厚度布氏硬度偏差≤15HBW,硬度均匀性良好,钢板超声波探伤符合GB/T2970―2016中I级要求。各项综合性能指标满足研制要求。Based on domestic and abroad market demands,this article introduces the development process of pre-hardened and ultra-thick 1.2311 steel plate used for plastic mold steel.Experimental study on continuous phase transformation behavior of 1.2311 steel was conducted,and a static continuous cooling transformation curve was drawn.By KK pretreatment→120 t converter(smelting using slag retention method can control carbon content within 0.20%-0.30%)→LF(refining argon blowing time≤60 minutes)→VD(vacuum degree≤67 Fa,vacuum holding time≥20 minutes)→450 mm slab continuous casting(low superheat of 8-15℃,low pulling speed of 0.45 m/min)→Slab heating→5000 mm mill rolling(the sum of the last three pass reductions is→140 mm for rough mill)→860-890℃normalizing process→ACC controlled cooling(combination of water cooling and air cooling)→550-610℃tempering process,the pre-hardened and ultra-thick steel plate for plastic mold 1.2311 with a specification of≥150 mm was successfully developed.The results show that a Brinell hardness deviation of≤15HBW across the entire thickness,resulting in good uniformity of hardness,the ultrasonic testing of the plates meets the requirements of Level I in GB/T2970-2016.All comprehensive performance indicators meet the development requirements.

关 键 词：1.2311钢 预硬化 连续冷却转变曲线 硬度 

分 类 号：TG142.45[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属材料]