GB5310—85高压锅炉用无缝钢管中规定,20G 高压锅炉管的组织应为铁素体加珠光体,不允许存在魏氏体组织。在热处理制度方面规定:900～930℃正火,热轧钢管当终轧温度大于或等于900℃时,可以代替正火。20G属亚共析钢,热轧产品极易产生魏氏体组织。产生魏氏体组织的原因有两个,一是过热,二是冷却速度过快。 GB5310-85 high pressure boiler with seamless steel pipe provisions, 20G high pressure boiler tube organization should be ferrite plus pearlite body, does not allow the presence of Wei’s body tissue. In the heat treatment system provides: 900 ~ 930 ℃ normalizing, hot-rolled steel pipe when the finishing temperature is greater than or equal to 900 ℃, instead of normalizing. 20G is a sub-eutectoid steel, hot-rolled products easily produce Wei’s body tissue. There are two reasons for the formation of Wenstein’s body tissue, one is overheating, and the other is cooling too fast.