| 序号 | 代号 | 牌号 | 化学成分.% | ||||||
| C | Si | Mn | Cr | Ni | Cu | ||||
| 不大于 | |||||||||
| 1 | U20080 | 08F | 0.05～O.11 | ≤0.03 | 0.25～0.50 | 0.10 | 0.30 | 0.25 | |
| 2 | U20100 | 10F | O.07～0.13 | ≤0.07 | O.25～0.50 | 0.15 | 0.30 | 0.25 | |
| 3 | U20150 | 15F | 0.12～0.18 | ≤0.07 | O.25～0.50 | 0.25 | O.30 | 0.25 | |
| 4 | U20082 | 08 | 0.05～0.11 | 0.17～0.37 | O.35～0.65 | 0.10 | O.30 | 0.25 | |
| 5 | U20102 | 10 | O.07～O.13 | 0.17～0.37 | O.35～0.65 | O.15 | O.30 | 0.25 | |
| 6 | U20152 | 15 | 0.12～0.18 | O.17～0.37 | 0.35～0.65 | O.25 | O.30 | 0.25 | |
| 7 | U20202 | 20 | 0.17～0.23 | 0.17～0.37 | O.35～0.65 | O.25 | O.30 | 0.25 | |
| 8 | U20252 | 25 | O.22～0.29 | O.17～0.37 | 0.50～0.80 | O.25 | 0.30 | 0.25 | |
| 9 | U20302 | 30 | 0.27～0.34 | 0.17～0.37 | O.50～0.80 | O.25 | O.30 | 0.25 | |
| 10 | U20352 | 35 | 0.32～0.39 | O.17～0.37 | 0.50～0.80 | O.25 | O.30 | 0.25 | |
| 11 | U20402 | 40 | 0.37～0.44 | O.17～0.37 | 0.50～0.80 | 0.Z5 | O.30 | 0.25 | |
| 12 | U20452 | 45 | O.42～O.50 | O.17～0.37 | 0.50～0.80 | O.25 | O.30 | 0.25 | |
| 13 | U20502 | 50 | O.47～0.55 | O.17～0.37 | O.50～0.80 | O.25 | O.30 | 0.25 | |
| 14 | U20552 | 55 | O.52～0.60 | 0.17～0.37 | 0.50～0.80 | O.25 | 0.30 | 0.25 | |
| 15 | U20602 | 60 | O.57～0.65 | 0.17～0.37 | 0.50～0.80 | 0.25 | O.30 | 0.25 | |
| 16 | U20652 | 65 | 0.62～0.70 | O.17～0.37 | 0.50～0.80 | O.25 | O.30 | 0.25 | |
| 17 | U20702 | 70 | O.67～0.75 | O.17～0.37 | 0.50～0.80 | 0.25 | 0.30 | 0.25 | |
| 18 | U20752 | 75 | O.72～0.80 | 0.17～0.37 | 0.50～0.80 | O.25 | 0.30 | 0.25 | |
| 19 | U20802 | 80 | O.77～0.85 | O.17～0.37 | 0.50～0.80 | 0.25 | 0.30 | 0.25 | |
| 20 | U20852 | 85 | O.82～0.90 | 0.17～0.37 | 0.50～0.80 | 0.25 | O.30 | 0.25 | |
| 21 | U21152 | 15Mn | O.12～0.18 | 0.17～0.37 | O.70～1.00 | 0.25 | O.30 | 0.25 | |
| 22 | U21202 | 20Mn | 0.17～0.23 | 0.17～0.37 | 0.70～I.00 | 0.25 | O.30 | 0.25 | |
| 23 | U21252 | 25Mn | 0.22～0.29 | 0.17～0.37 | O.70～1.00 | O.25 | O.30 | 0.25 | |
| 24 | U21302 | 30Mn | O.27～0.34 | 0.17～0.37 | O.70～1.00 | O.25 | O.30 | 0.25 | |
| 25 | U21352 | 35M13 | O.32～0.39 | 0.17～0.37 | O.70～1.00 | O.25 | 0.30 | 0.25 | |
| 26 | U21402 | 40M13 | O.37～0.44 | 0.17～0.37 | 0.70～1.00 | 0.25 | O.30 | 0.25 | |
| 27 | U21452 | 45Mn | O.42～0.50 | O.17～0.37 | O.70～1.00 | 0.25 | O.30 | 0.25 | |
| 28 | U21502 | 50Mn | 0.48～0.56 | 0.17～0.37 | O.70～1.00 | O.25 | O.30 | 0.25 | |
| 29 | U21602 | 60Mn | 0.57～O，65 | 0.17～0,37 | O.70～1.00 | O.25 | O.30 | 0.25 | |
| 30 | U21652 | 65M13 | O.62～0.70 | 0.17～0.37 | O.90～1.20 | O.25 | O.30 | 0.25 | |
| 31 | U21702 | 70M13 | 0.67～0.75 | 0.17～0.37 | O.90～1.20 | O.25 | O.30 | 0.25 | |
| 注：表1所列牌号为优质钢。如果是高级优质钢，在牌号后面加“A”（统一数字代号最后一位数字改为“3”）；如果是特级优质钢，在牌号后面加。E”（统一数字代号最后一位数字改为“6”）；对于沸腾钢，牌号后面为“F” （统一数字代号最后一位数字为“0”）；对于半镇静钢，牌号后面为“b”（统一数字代号最后～位数字为“1”） | |||||||||
