Based on hot metal pretreatment (HMPT)-basic oxygen furnace (BOF)-Rheinstahl Heraeus (RH)-compact strip production (CSP) process, parameters controlling on cold rolling deep drawing substrate SPHE were investigated du...Based on hot metal pretreatment (HMPT)-basic oxygen furnace (BOF)-Rheinstahl Heraeus (RH)-compact strip production (CSP) process, parameters controlling on cold rolling deep drawing substrate SPHE were investigated during smelting and rolling process by composition design and technology control. The influence of parameters on chemical compositions, mechanical properties and microstructure was revealed by scanning electron microscope (SEM). The results show that, 1) main chemical components in SPHE are w(C)≤40×10-6, w(Si)≤ 0.01%, w(S)≤0.009%, w(N)≤20×10-6, w(O)≤ 25×10-6; 2) main mechanical properties of the SPHE are δs=274 MPa, δb=334 MPa, A=48.9%; 3) main performances of deep drawing quality (DDQ) grade steel produced by SPHE are as follows, transversely δs=167 MPa, δb=298 MPa, n=0.219, r=2.46; vertically δs=166 MPa,δb=298 MPa, n=0.226, r=2.39; in 45° direction δs=171 MPa, δb=308 MPa, n=0.214, r=2.26; 4) microstructure of DDQ is ferrite, average grain size is Grade 7.5, and inclusion size is 3-10 μm.展开更多
文摘不锈钢厂采用铁水罐喷吹脱磷工艺为70 tAOD提供优质的低磷铁水冶炼400系列不锈钢,取代原电弧炉冶炼环节,实现了新型一步法冶炼不锈钢工艺。生产实践表明,铁水罐喷吹脱磷起始[P]为0.20%,处理后铁水[P]为0.001%~0.010%,[C]≥3.2%,温度≥1 320℃,完全满足后续AOD冶炼400系不锈钢的需要,与原70 t EAF-AOD流程相比,生产成本大幅降低。
基金Project(50971135) supported by the National Natural Science Foundation of China
文摘Based on hot metal pretreatment (HMPT)-basic oxygen furnace (BOF)-Rheinstahl Heraeus (RH)-compact strip production (CSP) process, parameters controlling on cold rolling deep drawing substrate SPHE were investigated during smelting and rolling process by composition design and technology control. The influence of parameters on chemical compositions, mechanical properties and microstructure was revealed by scanning electron microscope (SEM). The results show that, 1) main chemical components in SPHE are w(C)≤40×10-6, w(Si)≤ 0.01%, w(S)≤0.009%, w(N)≤20×10-6, w(O)≤ 25×10-6; 2) main mechanical properties of the SPHE are δs=274 MPa, δb=334 MPa, A=48.9%; 3) main performances of deep drawing quality (DDQ) grade steel produced by SPHE are as follows, transversely δs=167 MPa, δb=298 MPa, n=0.219, r=2.46; vertically δs=166 MPa,δb=298 MPa, n=0.226, r=2.39; in 45° direction δs=171 MPa, δb=308 MPa, n=0.214, r=2.26; 4) microstructure of DDQ is ferrite, average grain size is Grade 7.5, and inclusion size is 3-10 μm.
