论文部分内容阅读
引言蒸汽参数为140大气压570℃的动力装置是我国发展的方向。为此,必须拟定出一种能满足在这一温度下工作的珠光体型紧固件用钢。对于这一类型的紧固件材料,在合金化,热处理等方面,国外已进行过不少研究。应用于高参数动力装置上工作的紧固件材料,要求它在室温和高温下应具有高的屈服极限,以及良好的松弛稳定性。由циитмаш所拟定的钢Эи723、按其松弛稳定性来说,尚不能达到设计要求。25Cr_2Mo_1V(Эи723)钢在550℃初应力为
Introduction Steam parameters of 140 atmospheric pressure 570 ℃ power plant is the direction of development in China. For this reason, a steel for pearlite type fasteners that can work at this temperature must be developed. For this type of fastener material, in alloying, heat treatment, etc., have done a lot of research abroad. Fastener materials used in high-parameter power plants require that they have high yield limits at room temperature and elevated temperatures, as well as good relaxation stability. The steel Э7233, developed by циитмаш, has not been able to meet the design requirements due to its relaxation stability. 25Cr_2Mo_1V (Эи723) steel at 550 ℃ initial stress