论文部分内容阅读
５Ｃｒ２１Ｍｎ９Ｎｉ４Ｎ（以下简称２１４Ｎ）奥氏体型铬锰氮耐热钢是我国主要气阀材料。我公司采用热轧圆坯直接表面磨光工艺生产，生产量很大。圆坯磨光前需进行降低硬度的热处理。原工艺为：圆坯在台车式退火炉中加热到１０５０℃保温５ｈ后出炉空冷。由于加热温度低，?
5Cr21Mn9Ni4N (hereinafter referred to as 21 4N) austenitic chromium manganese nitrogen heat-resistant steel is China’s main valve material. My company uses hot-rolled round billet direct surface burnishing process, a large amount of production. Round billet polished before the need to reduce the hardness of the heat treatment. The original process is as follows: the round billet in the trolley annealing furnace heated to 1050 ℃ after 5h baked air cooling. Due to the low heating temperature,?