carbon precision bright tube for high temperature temper brittleness. Sensitive, containing chromium, manganese, nickel, silicon, two or more alloy steel is very sensitive, the sensitivity of the different types and content of alloy elements and different.精密光亮管淬火得到马氏体组织后，在450～600℃温度范围回火；或在650℃回火后以缓慢冷却速度经过350～600℃；或者在650℃回火后，在350～650℃温度范围长期加热，都使精密光亮管产生脆化现象如果已经脆化的20#精密钢管重新加热到650℃然后快冷