外徑壁厚 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 2l | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 32 | 34 | 36 | 38 |
68 | × | × | × | × | × | × | × | ||||||||||||||||||||||
76(76.1) | × | × | × | × | × | × | × | × | × | × | |||||||||||||||||||
83(82.5),89(88.9) | × | × | × | × | × | × | × | × | × | × | × | ||||||||||||||||||
95.5 | × | × | × | × | × | × | × | × | × | × | × | ||||||||||||||||||
102(101.6),105 | × | × | × | × | × | × | × | × | × | × | × | ||||||||||||||||||
108,114(114.3) | × | × | × | × | × | × | × | × | × | × | × | ||||||||||||||||||
12l | × | × | × | × | × | × | × | × | × | × | × | ||||||||||||||||||
127.133 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||||||||||||||
140(139.7),146 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | |||||||||||||
152(152.4),159 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | |||||||||||||
168(168.3) | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||||||||||
180(177.8) | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||||||||||
194(193.7) | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||||||||||
203 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | |||||||||
219(219.1),224 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | |||||
232 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||
245(244.5),252 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||
273 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||
299,325(323.9) | × | × | × | × | × | × | × | × | X | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | |||
355,377 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | ||||
402 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
鋼管尺寸/mm | 答應偏差(%) | ||
普通級 | 較高級 | ||
外徑 | ±l | ±O.75 | |
壁厚 | ≤20 | ±12.5 | ±lO |
>20 | +12.5 -10 |
牌號 | 化學成分(質量分數)(%) | |||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Nb | RE(加進量) | |
≤ | ||||||||||
20 | 0.17~0.24 | 0.17~0.37 | O.35~0.65 | 0.035 | 0.035 | 0.25 | O.25 | 0.20 | ||
35 | 0.32~0.40 | O.17~O.37 | O.50~O.80 | O.035 | O.035 | O.25 | O.25 | O.20 | ||
45 | 0.42~0.50 | O.17~O.37 | O.50~O.80 | O.035 | 0.035 | 0.25 | O.25 | 0.20 | ||
27SiMn | O.24~O.32 | 1.10~1.40 | 1.10~1.40 | 0.035 | 0.035 | 0.030 | 0.030 | 0.030 | ||
30MnNBRE | 0.27~O.36 | O.20~0.60 | 1.20~1.60 | 0.035 | 0.035 | 0.030 | 0.030 | 0.030 | 0.020~0.050 | 0.02~O.04 |
牌號 | 試樣熱處理制度 | 抗拉強度 ób/MPa | 屈服點 ó s/MPa | 伸長率 δ 5(%) | 斷面收縮率 (%) | 衝擊吸收功 Aku2/J | 鋼管退 火供給狀態 布氏硬度HBS≤ |
≥ | |||||||
20 | 400 | 245 | 20 | ||||
35 | 5lO | 305 | 17 | ||||
45 | 590 | 335 | 14 | ||||
27SiNn | (920±20)℃水淬 (450±50)℃回火 冷卻劑:油或水 | 980 | 835 | 12 | 40 | 39 | 217 |
30MnNbRE | (880±20)℃水淬 (450±50)℃回火 冷卻劑:空冷 | 850 | 720 | 13 | 45 | 48 |