发布网友 发布时间:2022-05-07 14:21
共2个回答
热心网友 时间:2022-06-30 07:09
国内的可以用09DR代替,它的原材料标准是ASTM A333 等级为GR。6,管道配件标准就是ASTM A420 。呵呵呵热心网友 时间:2022-06-30 07:09
ASTM A420/A420M–01Standard Specification for Piping Fittings of Wrought Carbon Steel andAlloy Steel for Low-Temperature Service