ASTM A335 P12钢管无缝钢管含量
ASTM A335 P12钢管无缝钢管碳含量≤0.15 ASTM A335 P12钢管无缝钢管硅含量≤0.50 ASTM A335 P12钢管无缝钢管锰含量0.30-0.60 ASTM A335 P12钢管无缝钢管硫含量0.035 ASTM A335 P12钢管无缝钢管磷含量0.035