Nb和热处理对C-Mn-Si系冷轧双相钢组织和性能的影响  

Nb and Heat Treatment on Structure and Properties of C-Mn-Si Series Cold Rolled Dual Phase Steel

作　　者：张增良[1] 宋仁伯[2] 程知松[3] 赵征志[1] 赵爱民[1] 刘光明[4] 熊爱明[4] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]北京科技大学材料科学与工程学院,北京100083 [3]高效轧制国家工程研究中心,北京100083 [4]首钢技术研究院,北京100041

出　　处：《特殊钢》2008年第2期13-15,共3页Special Steel

摘　　要：用25 kg真空感应炉冶炼的含Nb双相钢(%:0.19～0.21C、0.7～0.8Si、1.9～2.1Mn、0.02～0.04Nb)和不含Nb双相钢(%:0.17～0.19C、0.4～0.6Si、1.7～1.9Mn),经实验室双辊轧机轧成3.5 mm板,再冷轧至1.0 mm和1.36 mm钢板。冷轧板通过盐浴炉加热至740～820℃缓冷至680℃,再以≥50℃/s冷至280℃保温240 s空冷。结果表明,随加热温度提高,铁素体-马氏体组织中的马氏体量增加;当加热温度为820℃时C-Mn-Si双相钢抗拉强度可达1050 MPa,加Nb后由于晶粒进一步细化,820℃加热时,其抗拉强度可达1200 MPa。The dual phase steel adding Nb （0. 19 ～0.21C, 0.7 ～0.8Si, 1.9～2. 1Mn, 0.02 ～0.04Nb） and no adding Nb （0. 17 ～0. 19C, 0. 4 ～0. 6Si, 1.7 ～ 1.9Mn） were melted by using a 25 kg vacuum induction furnace and hot rolled to 3.5 mm plate by two-high mill then cold rolled to 1.0 mm and 1.36 mm sheet in laboratory. The cold sheet heated in salt bath furnace to 740- 820℃, slow cooled to 680℃ then fast cooled with cooling rate t〉50 ℃/s to 280 ℃ for 240 s, air cooling. Results showed that with increasing heating temperature, the martensite content in ferrite-martensite structure increased; As heating temperature was 820℃, the tensile strength of C-Mn-Si dual phase steel no adding Nb was up to 1 050 MPa, and as adding Nb to further fine grain of structure, the tensile strength of steel was up to 1 200 MPa.

关 键 词：C-Mn-Si系冷轧双相钢 马氏体 力学性能 铌 热处理 

分 类 号：TG142.15[一般工业技术—材料科学与工程]