Nb、Ti对高强度耐候钢组织和性能的影响  

Effect of Nb-Ti on Structure and Properties of High Strength Weathering Steel

作　　者：陈庆军[1] 康永林[1] 谷海容[1] 苏世怀[2] 张建平[2] 骆小刚[2] 马玉平[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]马鞍山钢铁股份有限公司技术中心,马鞍山243002

出　　处：《特殊钢》2005年第1期30-33,共4页Special Steel

基　　金：国家自然科学基金资助项目 ( 5 0 3340 1 0 )

摘　　要：为模拟CSP(紧凑式带材生产 )工艺 ,由实验室 10kg真空感应炉冶炼后轧成 6mm钢板 ,试验研究了Nb、Ti对成分 (% )为 0 0 6 0～ 0 0 76C ,0 2 5～ 0 31Cu ,0 4 5～ 0 5 6Cr,0 2 9～ 0 30Ni的 4 0 0MPa和 4 6 0MPa级高强度耐候钢组织和性能的影响。结果表明 ,含 0 0 3%Ti钢σs 和σb 分别为 4 5 0MPa和 5 4 5MPa ,含 0 0 3%Nb、0 0 2 %Ti钢σs 和σb 分别为 5 5 0MPa和 6 15MPa ,不含Nb、Ti钢σs 和σb 仅为 375MPa和 4 80MPa。 4 0 0MPa级耐候钢的组织为铁素体 +少量珠光体 ,含Ti钢的主要析出物为CuS2 (2 0～ 2 5nm)和TiN(80nm) ,含Nb、Ti4 6 0MPa级钢的组织主要为粒状贝氏体 ,析出物CuS2 和 (NbTi)CN(30～ 6 0nm) ,从而提高了钢的强度。To simulate compact strip production (CSP) technology, the effect of Nb-Ti on structure and mechanical properties of 400 MPa and 460 MPa high strength weathering steel - 0.060～0.076C, 0.25～0.31Cu, 0.45～0.56Cr, 0.29～0.30Ni has been studied by 10 kg vacuum induction furnace melting and rolled into 6 mm plate. The results showed that yield strength σ s and tensile strength σ b of steel contained 0.03% Ti were respectively 450 MPa and 545 MPa, σ s snd σ b of steel contained 0.03%Nb-0.02%Ti were 550 MPa and 615 MPa, and σ s and σ b of steel no-contained Nb and Ti were only 375 MPa and 480 MPa. The structure of 400 MPa weathering steels were ferrite + minor pearlite, and the main precipitates of steel contained Ti were CuS 2 (20～25 nm) and TiN (80 nm); the structure of 460 MPa steel contained Nb-Ti was mainly granular bainite with precipitates CuS 2 and (NbTi)CN (30～60 nm) therefore the strength of steel increased.

关 键 词：组织和性能 耐候钢 析出物 粒状贝氏体 珠光体 高强度 带材 冶炼 真空感应炉 紧凑 

分 类 号：TG113[金属学及工艺—物理冶金]