-50℃低温环境结构用S355NL φ406mm×15mm无缝钢管的开发  

Development of S355NL φ406 mm×15 mm Seamless Tube for -50℃ Low-Temperature Environment Structure

作　　者：安健波[1] 王振祥[2] 文玉成[3] 

机构地区：[1]天津钢管集团股份有限公司制造部,天津300301 [2]天津钢管集团股份有限公司特钢公司,天津300301 [3]天津钢管集团股份有限公司技术中心,天津300301

出　　处：《特殊钢》2017年第2期44-47,共4页Special Steel

摘　　要：V-Nb-Ti微合金化S355NL大口径低温结构用无缝管(/%:0.14~0.15C,0.29~0.30Si.1.35~1.37Mn,≤0.014P,≤0.005S,0.02~0.03Nb,0.06~0.07V,0.010~0.020Ti,Ceq 0.39~0.41)的生产流程为100 t EAF-LF-VD-喂Ca线-φ400 mm圆坯连铸-3辊连轧机组-940℃30 min空冷正火处理。16炉批统计结果表明,通过EAF出钢加硅锰、硅铝铁合金,LF采用CaO-SiO2-Al_1O_3渣系,全程吹氩,VD处理20~25 min,连铸长水口和吹氩等工艺措施,钢管的实物质量和性能稳定,组织均匀,晶粒细小,各项性能达到或超过了标准和用户的技术要求;屈服强度R_(eH)380~435 MPa,抗拉强度R_m522~605 MPa,伸长率A 24%~29%,-50℃冲击功132~237 J。The production flowsheet for V-Nb-Ti microalloying S355NL large size seamless tube for low-temperature structure （/% ： 0. 14 -0. 15C, 0. 29 ~0. 30Si, 1.35 - 1.37Mn, ≤0. O14P, ≤0. 005S, 0. 02 -0. 03Nb, 0. 06 ~0. 07V, 0. 010 -0. 020Ti, 0. 39 -0.41Ceq）is 100 t EAF-LF-VD-feeding Ca wire- φ400 mm round bloom casting- 3-roll mill train- normalizing treatment at 940 ℃ for 30 min, air cooling. The statistic results of 16 heats and batches show that with the process measures including adding silicon-manganese and ferrosilico-aluminium alloy in tapping of EAF, using CaO-SiO2- Al2O3 slag series and whole process argon blowing in LF refining, VD treating for 20 -25 rain, using long nozzle and argon blowing in casting process, the object quality and properties of steel tube are constant with uniform structure and fine grains, and the each property index meets or exceeds the technical requirement of standard and the purchaser, i.e. yield strength ReH 380 - 435 MPa, tensile strength Rm 522 - 605 MPA, elongation A 24% - 29% and impact energy at - 50 ℃ 132 ~ 237 J.

关 键 词：100t EAF-LF-VD-圆坯CC流程 Φ406 mm×15 MM S355NL钢管 -50℃ V-Nb-Ti微合金化 正火处理 

分 类 号：TF76[冶金工程—钢铁冶金] TG142.1[一般工业技术—材料科学与工程]