郑州大口径弯头 分类以材质划分碳钢: ASTM/ASME A234 WPB,WPC合金: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911,15Mo3 15CrMoV, 35CrMoV。 不锈钢:ASTM/ASME A403 WP 304-304L-304H-304LN-304NAST