GB5310无缝钢管34×4-5-6-8
GB5310无缝钢管36×3.5-5-6-8
GB5310无缝钢管38×4-5-6-7-8-9-10
GB5310无缝钢管39×3.5-5-8-10
GB5310无缝钢管42×3.5-4-5-6-7-8-9-10
GB5310无缝钢管45×3.5-4-5-6-7-8-9