天下無雙找人辦事熱線電話：
緊密鋼管化學成份：
| 牌號 | 化學成份% | |||||
| C | Si | Mn | S | P | Cr | |
| 10 | 0.07-0.13 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | |
| 20 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | |
| 35 | 0.32-0.39 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | |
| 45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | |
| 40Cr | 0.37-0.44 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | 0.08-1.10 |
| 25Mn | 0.22-0.29 | 0.17-0.37 | 0.70-1.00 | ≤0.035 | ≤0.035 | ≤0.25 |
| 37Mn5 | 0.30-0.39 | 0.15-0.30 | 1.20-1.50 | ≤0.015 | ≤0.020 | |
掃掃下，存眷我們