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试验用GCr15轴承钢的生产工艺为100 t BOF-LF-RH-250 mm×280 mm连铸坯-Φ70 mm轧材。用碳截面偏析检验、射钉试验及高倍检验等分析检测方法,研究了结晶器冷却水2 530 L/min,钢水过热度33~37℃,二冷比水量0.12 L/kg,M-EMS 530 A/2.5 Hz,F-EMS 400 A/3.0 Hz参数下,GCr15轴承钢连铸坯拉速0.52~0.58m/min对连铸坯轴承钢碳偏析、坯壳厚度及末端凝固位置和Φ70 mm轧材带状的影响。结果表明,随着连铸拉速的提升,铸坯的宏观碳偏析先呈现下降后呈现上升趋势,凝固末端位置后移,液相穴长度变长,拉速控制在0.55m/min,有利于降低铸坯的宏观碳偏析和轧材球化退火后的带状组织级别。
The production process of GCr15 bearing steel for test is 100 t BOF-LF-RH-250 mm × 280 mm slab-Φ70 mm rolled material. The carbonaceous segregation test, nailing test and high power test were used to analyze the detection methods. The effects of mold cooling water of 2 530 L / min, molten steel superheat of 33 ~ 37 ℃, secondary cooling water ratio of 0.12 L / kg, M-EMS 530 Under the parameters of A / 2.5 Hz and F-EMS 400 A / 3.0 Hz, the rolling speed of GCr15 bearing steel billet was 0.52-0.58 m / min. The carbon segregation of bearing steel, the thickness of the shell and the final solidification position and Φ70 mm rolling Material strip effect. The results show that with the increase of casting speed, the macroscopic carbon segregation of cast slab decreases first and then increases. The position of the end of solidification moves backward, the length of liquid phase grows longer, and the casting speed is controlled at 0.55m / min, which is in favor of Reduce the slab macro-carbon segregation and rolling ball after annealing of the band organization level.