42crmo合金管299*40化学成分\ 国家规定钢管标准

25×2.5-3-4-5-6	28	108×4.5-5-6-7-8-22	75	299×30-32-36-38-40	70
28×3-3.5-4-5-6	30	114×4.5-5-6-7-8-1-14-18-20	100	325×8-12-14-18-38	120
32×3.5-4-5-6-8	40	121×4.5-5-6-7-8-10-12-14-16-20	102	325×28-32-34-38	75
34×4-5-6-8	35	127×4.5-5-6-7-8-10-12-14-16-20	95	351×10-16-20-25-40	120
36×3.5-5-6-8	30	133×4.5-6-8-12-14-16-18-20-25-30	120	355×6-18-20-25-30-40	45
38×4-5-6-7-8-9-10	33	140×5-6-7-8-9-10-12-14-16-2	50	377×8-12-15-20-24-28