ASTM A335 P12鋼管無縫鋼管含量
ASTM A335 P12鋼管無縫鋼管碳含量≤0.15 ASTM A335 P12鋼管無縫鋼管硅含量≤0.50 ASTM A335 P12鋼管無縫鋼管錳含量0.30-0.60 ASTM A335 P12鋼管無縫鋼管硫含量0.035 ASTM A335 P12鋼管無縫鋼管磷含量0.035