河北华岐镀锌钢管避厚是多少(河北华岐镀锌钢管厂)

镀锌钢管国标厚度是多少？镀锌钢管国标厚DN15-国标厚度2.75,DN20-国标厚度2.75,DN25-国标厚度3.25,DN32-国标厚度3.5,DN40-国标厚度3.5,DN50-国标厚度3.5,DN65-国标厚度3.5,DN80-国标厚度4。镀锌钢管分为冷镀锌钢管、热镀锌钢管，冷镀锌钢管已被.