Han Fei,Liang Jian,Bao Siqian,et al.Development of Pre-hardened and Ultra-thick 1.2311 Steel Plate Used for Plastic Mold Steel[J].Special Steel,2025,46(02):43-47.
Han Fei,Liang Jian,Bao Siqian,et al.Development of Pre-hardened and Ultra-thick 1.2311 Steel Plate Used for Plastic Mold Steel[J].Special Steel,2025,46(02):43-47. DOI: 10.20057/j.1003-8620.2024-00186.
Development of Pre-hardened and Ultra-thick 1.2311 Steel Plate Used for Plastic Mold Steel
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 KR 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 Pa,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→5 000 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.
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