Abstract: The powder no-adding carbon of which the main ingredient is TC 1. 10~1.22，Al₂O₃ 5.03～5.62，Na₂O 3.29~3.40，CaO/SiO₂=0.55~0.58 has been developed to reduce the recarburization of 10.3 t ingot of 0.03~0.07 C cold heading steel.The powder has high melting temperature (1300℃),high viscosity(1.5 Pa · s at 1500 ℃)and low bulk density(0.38～0.40 g ·cm^-3),that is available to decrease melting speed of powder(5.70～5.96 g/min).Pilot production results showed that the occurred ratio of recarburization was ≤5%.

Key words: Cold Heading Steel, Ingot Casting, Powder without Free Carbon

摘要： 为减少0.03%～0.07%C冷镦钢10.3 t模铸锭的增碳,开发了不添加炭素材料保护渣,主要成分(%)为TC 1.10～1.22,Al₂O₃ 5.03～5.62，Na₂O 3.29～3.40；CaO/SiO₂=0.55～0.58。该保护渣具有高的熔化温度(1 300℃)，高粘度(1 500℃,1.5 Pa·s)，低容重(0.38～0.40 g·cm^-3),因此能降低保护渣的熔化速度(1 500℃，5.70～5.96 g/min)。生产试验表明,钢坯增碳发生率≤5%。

关键词: 冷镦钢, 模铸, 无自由碳保护渣