耐候钢S355J2W的研发和工艺实践  

Development and Process Practice of Weathering Steel S355J2W

作　　者：栾文林[1] 刘志远[1] 赵定国[2] 

机构地区：[1]河北钢铁集团唐钢中厚板公司,唐山063000 [2]河北联合大学冶金与能源学院,唐山063009

出　　处：《特殊钢》2014年第1期43-45,共3页Special Steel

基　　金：河北省自然科学基金项目资助(E2013209113)

摘　　要：研发的耐候钢S355J2W(/%:0.06~0.10C,0.20~0.40Si,1.00~1.30Mn,≤0.008S,≤0.020P,0.25~0.40Cu,0.30~0.55Cr,0.10~0.30Ni,0.020~0.040Nb,0.020~0.050Alt)的试生产流程为铁水-120 t顶底复吹转炉-LF-250 mm×2 000 mm板坯连铸-轧制≤16 mm板。通过采取控制转炉终点[C]≤0.05%,[P]≤0.015%,精炼时(FeO)+(MnO)≤1.5%,(SiO_2)≤15%,精炼渣碱度≥3.0,[Al]s≥0.025%,按Ca/Al=0.06~0.12,喂入钙线,连铸时采用耐候钢专用保护渣[主要成分/%:34.0CaO,28.0SiO_2,4.6Al_2O_3,≤6(Li_2O+B_2O_3)],控制开坯温度1 010~1 060℃等工艺措施,≤16 mm耐候钢S355J2W成品板铝含量为0.025%~0.035%,钢中平均氧含量为21×10^(-6),平均氮含量为31×10^(-6),钢中非金属夹杂物的尺寸基本≤14μm,各项冶金质量指标合乎要求。The pilot production flow sheet for developed weathering steel S355J2W （/% ： O. 06 - 0. 10C, O. 20 0.40Si, 1. O0-1.30Mn, ≤0.008S, ≤0.020P, 0. 25 - 0. 40Cu, 0.30--0.55Cr, 0.10 -0.30Ni, 0. 020 - 0. 040Nb, 0. 020 -0. 050Alt） is hot metal-120 t top and bottom combined blown converter-LF-250 mm - 2 000 mm slab CC-≤ 16 mm plate rolling process. With using the process measures including controlling converter end [ C] ≤ 0. 05% and [PI ≤ 0. 015%, in refining （FeO） ＋ （MnO）≤1.5 %, （ SiO2 ） ≤ 15%, refining slag basicity t〉 3. O, [ A1 ] s I〉 0. 025 % and feeding calcium wire according Ca/A1 = O. 06 - 0. 12, in casting using special-purpose mold shielding flux for weathering steel [ main ingredient/% ： 34. 0CaO, 28. OSiO2, 4. 6A1203,≤ 6 （ Li20 ＋ B203 ） ], controlling breakdown temperature 1 010 - 1 060 ℃, the aluminium content in ≤ 16 mm finished plate of weathering steel is O. 025% - O. 035%, the average oxygen content in steel is 21 x 10-6 and the average nitrogen content in steel is 31 × 10-6, the size of nonmetallic inclusions in steel normally ≤ 14 μm, and the each metallurgy quality index meets the requirement of standard.

关 键 词：耐候钢S355J2W 120 t BOF—LF-板坯CC流程 研发 工艺实践 

分 类 号：TG142.7[一般工业技术—材料科学与工程]