铌、钒、钛微合金化钢的边角裂纹与高温延塑性

通过对含铌、钒、钛钢高温延塑性的测试和连铸坯表面温度的测定,含铌、钒、钛钢在700~900℃第Ⅲ脆性温度区断面收缩率RA值较低,约在36%左右.若RA值大于40%时,高温延塑性温度为950℃,即使采用弱冷,铸坯边角部温度也不能够完全达到.结合我厂连铸坯生产工艺和设备的实际情况,对有利于消除表面裂纹的防治措施进行了探讨并提出了建议.

Cracks of the side cape and the ductile plastic property in the tiny metal alloy of Nb,Ti, V

According to the test of the high temperature ductile plastic property and the surface temperature of continuous casting billets, when it contains Nb, V, Ti among 700-900℃ in the third brittleness temperature province, contraction of cross sectional area, the rate RA value is lower, about 36%. If the RA value is more than 40%, the ductile plastic property temperature is about 950℃. Even adopting weak colding, the temperature of casting billet side cape also can't attain enough. Through the measurement, it can give the very big help towards drawing up the craft measure, improving the thermal plasticity of straightening areas and reducing cracks of the casting billet side cape. Combining with the production process and the actual conditions of the continuous caster in our plant, practical discussion and proposals have been made for the preventative measures of eliminating sur-face cracking.