ASTM A 214 ELECTRIC-RESISTANCEWELDED CARBON STEEL HEAT-EXCHANGER AND CONDENSER TUBES
SA-214 電阻焊碳鋼換熱器和冷凝管 標準#焊接鋼管# #鋼管加工# #鋼管生產# #鋼管標準# #鋼管選材# #ASTM#