低合金超高强度钢32CrNiMoNb的控轧控冷工艺的试验研究  

Test and Study on Controlling Rolling and Cooling Process of Low-Alloy Ultra-High Steel 32CrNiMoNb

作　　者：苏春霞[1,2] 陈本文[1,2] 付超[1,2] 杨晰[1,2] 杨成 易东升 李雷 Su Chunxia Chen Benwen Fu Chao Yang Xi Yang Cheng Yi Dongsheng Li Lei(State Key Laboratory of Metal Materials for Marine Equipment and Application Techology Center, Angang Corp Ltd, Anshan 114009)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室 [2]鞍钢股份有限公司技术中心,鞍山114009

出　　处：《特殊钢》2017年第4期5-8,共4页Special Steel

摘　　要：试验用32CrNiMoNb钢(/%:0.32C,0.30Si,0.30Mn,0.012P,0.004S,1.25Cr,1.20Ni,0.36Mo,0.05Nb)经200 kg真空感应炉熔炼,铸成135 mm×135 mm铸坯。在实验室550 mm中厚板轧机,采用两阶段控制轧制加直接淬火工艺生产12 mm钢板。试验了第二阶段开轧温度(950℃和1 000℃)、终轧温度(900℃和950℃)、直接淬火终冷温度(150~350℃)对试验钢力学性能和组织等的影响。结果表明,第二阶段开轧温度(950±10)℃、终轧温度(900±10)℃、直接淬火终冷温度(250±10)℃,钢板的力学性能(R_(p0.2)1 515 MPa,R_m 1 805 MPa,A8%,-40℃K_(V2)冲击功24 J)、弯曲性能(180°)、组织(细小马氏体)和析出相(NbCN)达到了最佳匹配。The tested steel 32CrNiMoNb （/% ： 0. 32C, 0. 30Si, 0. 30Mn, 0. 012P, 0. 004S, 1.25Cr, 1.20Ni, 0. 36Mo, 0. 05Nb） is melted by a 200 kg vacuum induction furnace and cast to 130 mmx 135 mm billet. And in laboratory the billet is rolled to 12 ram plate by a 550mm medium-heavy mill using two stage controlling rolling and cooling and direct- quenching process. The effect of beginning rolling temperature （950 ℃ and 1 000 ℃ ）, finishing rolling temperature （900 ℃ and 950 ℃ ） and direct-quenching end cooling temperature （ 150 - 350 ℃ ） at second stage on structure and mechanical properties of tested steel has been tested. Results show that at second stage with beginning rolling at （950 ±10）℃, finish- ing rolling at （900 ± 10）℃ and direct-quenching end cooling temperature （250 ± 10）℃, the matching of mechanical prop- erties （Rp0.2- 1 515 Mpa, Rm- 1 805 Mpa, A- 8% and at -40 ℃ impact energy Kv2- 24 J） and bending performance （180~） of plate, structure （fine martensite） and precipitated phase （NbCN） is best.

关 键 词：低合金高强度钢32CrNiMoNb 两阶段控制轧制 直接淬火 终冷温度 力学性能 组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]