Q390高强低合金厚板控制轧制工艺

通过模拟实验研究了控制轧制工艺对Q390高强度低合金厚板结构用钢显微组织和力学性能的影响;通过组织分析和力学性能检测表明采用本研究所设定的控制轧制工艺试验轧制的50 mm厚板,其Rm>517 MPa,ReL>382 MPa,韧脆转变温度介于-60℃至-70℃之间,达到了GB/T1591—94的要求.在Nb(C,N)完全固溶温度以下保温有利于提高钢板的低温韧性;在相同的精轧总压下量和空冷制度下,轧制道次及介于830~780℃的终轧温度对于钢板的组织性能影响不大.

Research on CR Process of Q390 HSLA Heavy Plate

The effect of controlled rolling (CR) process on the microstructure and mechanical properties of Q390 HSLA heavy plate was investigated by way of lab simulation test with process parameters optimized. The results showed that the 50 mm-thick heavy structural plates rolled with these parameters have high strength with better low-temperature toughness, i.e., Rm > 517 MPa, ReL> 382 MPa and the ductile-brittle transition temperature is in the range from -60°C to -70°C. Such properties are up to the standard GB/T1591-94. Holding the temperature below the complete solution temperature of Nb (C, N) makes for the improvement of the low-temperature toughness of steel. The number of rolling passes and finish rolling temperature from 830°C to 780°C have no remarkable effect on microstructure and properties of the plates when the total reduction of finishing pass and air cooling schedule remain unchanged.