ZG35Cr26Ni12WNRE奥氏体耐热钢的研制

Development of ZG35Cr26Ni12WNRE Heat Resistant Austenitic Steel

在ZG35Cr26Ni8NRE炼镁还原罐用耐热钢的基础上,开发了ZG35Cr26Ni12WNRE奥氏体耐热钢,并研究了新研制耐热钢的组织结构和蠕变性能。结果表明,新研制耐热钢的奥氏体基体固溶有较多的碳元素,含有较少的大尺寸(几十微米)颗粒状和蠕虫状碳化物相,在高温条件下会析出较多的超细颗粒(1微米左右)碳化物相;新研制耐热钢在1 000℃、16 MPa条件下的蠕变第二阶段蠕变速率为0.000 2%·h^-1,仅是ZG35Cr26Ni8NRE的1/7,高温蠕变性能大幅提高。

Based on the heat-resistant steel ZG35Cr26Ni8NRE for magnesium reduction pot, ZG35Cr26Ni 12WNRE heat-resistant austenitic steel was developed. The microstructure and creep properties of the newly developed heat-resistant steel were studied. The results show that the newly developed steel contains more carbon in the austenite matrix, and fewer large-sized (tens of microns) granular and worm-like carbide phases. Further, more ultrafine particle (about 1 micron) carbide phases will precipitate after it is treated at high temperature. The creep rate at second stage of the newly developed steel is 0.000 2%·h^-1 at 1 000 ℃ and 16 MPa, just 1/7 of the ZG35Cr26Ni8NRE steel. High temperature creep performance is greatly improved.