封头标准参数表 The manuscript was revised on the evening of 2021
标记示例:椭圆形封头Dg400×4 JB1154-73
注:1表中带括号的公称直径应尽量不用.
2.厚度系指成形前的钢板厚度规格.
3.重量按材料比重为7.85kg/cm3