中低壓鍋爐管GB/T3087-2008 20鋼45Q345B無縫鋼管
20g中低壓鍋爐管42×3.5-4-5-6-7-8-9-10
20g中低壓鍋爐管45×3.5-4-5-6-7-8-9
20g中低壓鍋爐管48×3.5-4-5-6-7-8-9-10
20g中低壓鍋爐管51×3.5-4-5-6-7-8-9-10
20g中低壓鍋爐管56×3.5-4-5-6-7-8-9-10
20g中低壓鍋爐管57×3.5-5-6-7-8-9-10-12
20g中低壓鍋爐管60×3.5-4.5-5-6-7-8-9-12-14
20g中低壓鍋爐管63×3.5-4.5-5-6-7-8-9-10-12-14
20g中低壓鍋爐管68×4-4.5-5-6-7-8-9-10-12-14-16
20g中低壓鍋爐管70×4-4.5-5-6-7-8-9-10-12-15-16
20g中低壓鍋爐管73×4-4.5-5-6-7-8-9-10-12-15
20g中低壓鍋爐管76×4-4.5-5-6-7-8-9-10-12-14
20g中低壓鍋爐管83×4.5-5-10-12-14-16-18-20
20g中低壓鍋爐管108×4.5-5-6-7-8-10-12-14-18-20-22
20g中低壓鍋爐管114×4.5-5-6-7-8-10-12-14-18-20
