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本文就我厂20g钢板出现的热加工敏感性的问题进行了探讨。结果指出,铜是影响20g钢板热加工敏感性的主要因素,Sn,Sb,As等低熔点夹杂物的存在助长了这一敏感性。由试验统计得出经验方程,指出铜当量∑Cu小于0.2％,基本满足20g钢板在950℃下热冲压要求。经微钛处理有效提高其热加工性能,冲压温度可由950℃提高到1050℃,微钛处理钢在高温加热时钛可能被吸附于晶界上,阻碍了铜等低熔点夹杂物的不利影响。当然,钛提高奥氏体晶粒长大温度及阻止奥氏体晶粒长大,亦有助于热加工性能的改善。
This article on the 20g steel factory thermal processing sensitivity of the problem were discussed. The results show that copper is the main factor affecting the thermal processing sensitivity of 20g steel. The presence of low-melting inclusions such as Sn, Sb and As contributes to this sensitivity. The empirical equation is derived from the experimental statistics, indicating that the copper equivalent ΣCu is less than 0.2%, basically meeting the hot stamping requirement of 20g steel plate at 950 ° C. The micro-titanium treatment can effectively improve its hot workability. The stamping temperature can be increased from 950 ℃ to 1050 ℃. Titanium may be adsorbed on the grain boundary when it is heated at high temperature, hindered the adverse effects of copper and other low-melting inclusions. Of course, titanium increases the austenite grain growth temperature and prevents austenite grains from growing, and also contributes to the improvement of hot workability.