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.
作者
苏春霞
陈本文
付超
杨晰
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)
出处
《特殊钢》
北大核心
2017年第4期5-8,共4页
Special Steel
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
Material Index Low-Alloy Ultra-High Steel 32CrNiMoNb, Two Stage Controlling Rolling, Direct-Quenching, EndCooling Temperature, Mechanical Properties, Structure
