低中压锅炉管 GB3087 83×4.5-5-10-12-14-16-18-20 低中压锅炉管 GB3087 89×4.5-8-10-12-14-16-18-20 低中压锅炉管 GB3087 95×4.5-6-8-10-12-14-16-20 低中压锅炉管 GB3087 102×4.5-5-6-7-8-10-12-14-16-20 低中压锅炉管 GB3087 108×4.5-5-6-7-8-10-12-14-18-20-22 低中压锅炉管 GB3087 114×4.5-5-6-7-8-10-12-14-18-20 低中压锅炉管 GB3087 121×4.5-5-6-7-8-10-12-14-16-20 低中压锅炉管 GB3087 127×4.5-5-6-7-8-10-12-14-16-20 低中压锅炉管 GB3087 133×4.5-6-8-12-14-16-18-20-25-30 低中压锅炉管 GB3087 140×5-6-7-8-9-10-12-14-16-20-22 低中压锅炉管 GB3087 146×4.5-6-8-12-14-16-18-20-25-30 低中压锅炉管 GB3087 152×4.5-6-8-12-14-16-18-20-25-30 低中压锅炉管 GB3087 159×4.5-6-10-12-14 低中压锅炉管 GB3087 159×16-18-20-22-25-30 低中压锅炉管 GB3087 168×8-10-12-14-20-25-30-35 低中压锅炉管 GB3087 180×8-12-16-25-30 低中压锅炉管 GB3087 180×32-34-38-40-45-50