摘要
通过真空感应炉熔炼和浇铸的50 kg锭锻成40 mm×150 mm坯和热轧成10 mm板以及热模拟试验研究了开发的低硅Nb-Ti微合金化双相钢（/%：0.082C,0.15Si,1.20Mn,0.010P,0.002S,0.020Nb,0.015Ti,0.045Al,0.003 5 N）静态和动态连续冷却转变（CCT）曲线、组织（11%马氏体＋89%铁素体）和力学性能（抗拉强度682 MPa）。并通过铁水脱硫-260 t BOF-LF-RH-230 mm×1 300 mm连铸-热轧工艺试制了低硅双相钢（/%：0.075C,0.15Si,1.16Mn,0.012P,0.003S,0.016Nb,0.015Ti,0.033Al,0.004 3 N）3.5mm板。结果表明,精轧出口温度810℃,水冷至700℃,空冷4.5 s,卷取温度150℃时,该钢的组织为15%马氏体＋85%铁素体,晶粒度12-12.5级,抗拉强度672-692 MPa,伸长率24.0%-28.5%,屈强比0.65-0.67,钢板冲压成塑性能优良,制造的轿车轮辐弯曲疲劳性能15×10-4次。
The static and dynamic continuous cooling transformation （CCT） curves, structure （11% martensite ＋ 89% ferrite） and mechanical properties （tensile strength 682 MPa） of developed low silicon and Nb-Ti Microalloying dual phase steel （/% ： 0. 082C, 0. 15Si, 1.20Mn, 0. 0lOP, 0. 002S, 0. 020Nb, 0. 015Ti, 0. 045A1, 0. 003 5 N） have been tested and studied by melting in a vacuum induction furnace, casting 50 kg ingot, forging to 40 mm × 150 mm slab and hot rolling to 10 mm plate and thermal simulation testing. And 3.5 mm low silicon dual phase steel plate （/% ： 0. 075C, 0. 15Si, 1.16Mn, 0. 012P, 0. 003S, 0. 016Nb, 0. 015Ti, 0. 033Al, 0. 004 3N） has been pilot-produced by hot metal desulphufization-260 t BOF-LF-RH-230 mm × 1 300 mm slab concasting-hot rolling process. Results show that with finished roiling 810 22, water cooling to 700 22, air cooling for 4. 5 s and coiling at 150 22, the structure of steel is 15% ＋ 85% ferrite with gain size rating 12 - 12. 5, the tensile strength of steel is 672- 692 MPa with yield-uhimate strength ratio 0. 65 - 0. 67, and the yield of steel is 24. 0% -28.5%. The steel plate has nice stamping performance and the bending fatigue life of manufactured wheel rib of car is 15 × 10^4.
出处
《特殊钢》
北大核心
2014年第5期47-49,共3页
Special Steel
