50 t EAF-AOD-LF-VD-CC-轧制高碳不锈钢9Cr18盘条的工艺实践

采用50 t EAF-AOD-LF-VD-150 mm×150 mm坯连铸-高速线材连轧工艺生产9Cr18钢(/%:0.95C，0.35Si，0.37Mn，0.032P，0.002S，17.42Cr，0.01Mo)Φ5.5 mm盘条。通过控制S]≤0.008%,添加0.05%稀土元素,连铸坯经1160℃高温扩散处理,Φ5.5 mm成品盘条采用860℃球化退火等工艺措施,检验结果表明,盘条中心和一般疏松,以及偏析均≤1.0级,共晶碳化物不均匀度1.0~2.0级,球化退火组织为球状珠光体+块状碳化物,抗拉强度750~780 MPa,伸长率20%~26%,具有良好的冷拔性能。

Process Practice of Rod Coil of High Carbon Stainless Steel 9Cr18 Produced by 50 t EAF-AOD-LF-VD-CC-Rolling Flow Sheet

The Φ5.5 mm rod coil of steel 9Crl8 (/% ： 0.95C, 0.35Si, 0.37Mn, 0.032P, 0.002S, 17.42Cr,0.01Mo) is produced by 50t EAF-AOD- LF- VD- 150 mm x 150 mm billet concasting- high speed rod rolling process. With using the process measures including controlling S] ≤ 0.008% , adding 0.05% RE elements, concasting billet high-temperature diffusion treating at 1160 ℃ and Φ5.5 mm rod coil products spheroidizing annealing at 860 ℃, the examination results show that of rod coil the rating o£ center and general porosity, and segregation are all ≤ 1.0, the rating of non-uniformity of eutectic carbide is 1.0-2.0, the spheroidizing annealing structure of rod is spheroidal pearlite + massive carbide, the rod has nice cold-drawing performance with tensile strength 750-780 MPa and elongation 20%-26%.