牌号 · 20#
20# 无缝钢管
低碳通用主力牌号。可焊、易切削、加工容错度高，这也是它成为我们场区库存最深牌号的原因。适用于强度要求中等、但更看重一致性与供货稳定的场合。
465
在库规格数
Φ95–630
外径范围 (mm)
15–120
壁厚范围 (mm)
GB/T 8163
执行标准
国际牌号对照
| 中国标准 | GB/T 8163 · GB/T 8162 |
|---|---|
| 最接近的对应牌号 | ASTM A106 Gr.B |
| 其他可对标牌号 | AISI 1020 |
| 其他可对标牌号 | JIS S20C |
| 其他可对标牌号 | DIN St 35 |
典型性能
| 抗拉强度 | ≥ 410 MPa（标准下限） |
|---|---|
| 屈服强度 | ≥ 245 MPa（标准下限） |
| 延伸率 | ≥ 21% |
| 焊接性 | 良好——常规壁厚无需预热 |
典型用途
- 流体与低压输送管线
- 结构件与机械制造
- 通用机加工料与空心件
- 液压缸筒（轻载工况）
交货状态
交货状态对材料的影响，比多数买家想象的大得多。告诉我们这个零件要干什么，我们来推荐交货状态。
热轧态正火态去应力
20# 在库规格
465 个规格组合，更新于 2026-08-22。库存每天流动——询价时请确认现货。
| 外径 × 壁厚 (mm) | 外径 (英寸) |
|---|---|
| Φ95 × 20 | 3.74″ |
| Φ95 × 23 | 3.74″ |
| Φ108 × 18 | 4.25″ |
| Φ114 × 16 | 4.49″ |
| Φ114 × 22 | 4.49″ |
| Φ127 × 24 | 5.00″ |
| Φ127 × 26 | 5.00″ |
| Φ133 × 24 | 5.24″ |
| Φ133 × 35 | 5.24″ |
| Φ140 × 40 | 5.51″ |
| Φ146 × 32 | 5.75″ |
| Φ152 × 28 | 5.98″ |
| Φ159 × 24 | 6.26″ |
| Φ159 × 38 | 6.26″ |
| Φ159 × 40 | 6.26″ |
| Φ168 × 32 | 6.61″ |
| Φ168 × 38 | 6.61″ |
| Φ168 × 40 | 6.61″ |
| Φ168 × 42 | 6.61″ |
| Φ168 × 45 | 6.61″ |
| Φ168 × 46 | 6.61″ |
| Φ170 × 50 | 6.69″ |
| Φ178 × 19 | 7.01″ |
| Φ180 × 30 | 7.09″ |
| Φ180 × 32 | 7.09″ |
| Φ180 × 35 | 7.09″ |
| Φ180 × 38 | 7.09″ |
| Φ180 × 40 | 7.09″ |
| Φ180 × 42 | 7.09″ |
| Φ180 × 45 | 7.09″ |
| Φ180 × 50 | 7.09″ |
| Φ188 × 25 | 7.40″ |
| Φ194 × 21 | 7.64″ |
| Φ194 × 25 | 7.64″ |
| Φ194 × 25.4 | 7.64″ |
| Φ194 × 26 | 7.64″ |
| Φ194 × 30 | 7.64″ |
| Φ194 × 32 | 7.64″ |
| Φ194 × 35 | 7.64″ |
| Φ194 × 40 | 7.64″ |
| Φ194 × 45 | 7.64″ |
| Φ194 × 55 | 7.64″ |
| Φ194 × 60 | 7.64″ |
| Φ203 × 20 | 7.99″ |
| Φ203 × 22 | 7.99″ |
| Φ203 × 24 | 7.99″ |
| Φ203 × 25 | 7.99″ |
| Φ203 × 30 | 7.99″ |
| Φ203 × 32 | 7.99″ |
| Φ203 × 40 | 7.99″ |
| Φ203 × 45 | 7.99″ |
| Φ203 × 50 | 7.99″ |
| Φ203 × 55 | 7.99″ |
| Φ210 × 22 | 8.27″ |
| Φ210 × 64 | 8.27″ |
| Φ219 × 18 | 8.62″ |
| Φ219 × 20 | 8.62″ |
| Φ219 × 22 | 8.62″ |
| Φ219 × 23 | 8.62″ |
| Φ219 × 25 | 8.62″ |
| Φ219 × 27 | 8.62″ |
| Φ219 × 32 | 8.62″ |
| Φ219 × 35 | 8.62″ |
| Φ219 × 38 | 8.62″ |
| Φ219 × 40 | 8.62″ |
| Φ219 × 45 | 8.62″ |
| Φ219 × 60 | 8.62″ |
| Φ219 × 65 | 8.62″ |
| Φ224 × 22 | 8.82″ |
| Φ224 × 25 | 8.82″ |
| Φ224 × 35 | 8.82″ |
| Φ232 × 20 | 9.13″ |
| Φ232 × 22 | 9.13″ |
| Φ232 × 25 | 9.13″ |
| Φ232 × 35 | 9.13″ |
| Φ232 × 38 | 9.13″ |
| Φ232 × 40 | 9.13″ |
| Φ232 × 41 | 9.13″ |
| Φ232 × 42 | 9.13″ |
| Φ232 × 45 | 9.13″ |
| Φ232 × 50 | 9.13″ |
| Φ232 × 55 | 9.13″ |
| Φ232 × 60 | 9.13″ |
| Φ232 × 65 | 9.13″ |
| Φ232 × 70 | 9.13″ |
| Φ238 × 35 | 9.37″ |
| Φ238 × 40 | 9.37″ |
| Φ238 × 45 | 9.37″ |
| Φ238 × 60 | 9.37″ |
| Φ245 × 15 | 9.65″ |
| Φ245 × 19 | 9.65″ |
| Φ245 × 21 | 9.65″ |
| Φ245 × 22 | 9.65″ |
| Φ245 × 25 | 9.65″ |
| Φ245 × 27 | 9.65″ |
| Φ245 × 28 | 9.65″ |
| Φ245 × 30 | 9.65″ |
| Φ245 × 32 | 9.65″ |
| Φ245 × 33 | 9.65″ |
| Φ245 × 35 | 9.65″ |
| Φ245 × 36 | 9.65″ |
| Φ245 × 38 | 9.65″ |
| Φ245 × 40 | 9.65″ |
| Φ245 × 42 | 9.65″ |
| Φ245 × 45 | 9.65″ |
| Φ245 × 50 | 9.65″ |
| Φ245 × 55 | 9.65″ |
| Φ245 × 60 | 9.65″ |
| Φ245 × 65 | 9.65″ |
| Φ245 × 70 | 9.65″ |
| Φ245 × 75 | 9.65″ |
| Φ254 × 22 | 10.00″ |
| Φ254 × 30 | 10.00″ |
| Φ254 × 32 | 10.00″ |
| Φ254 × 35 | 10.00″ |
| Φ254 × 40 | 10.00″ |
| Φ254 × 42 | 10.00″ |
| Φ254 × 45 | 10.00″ |
| Φ254 × 50 | 10.00″ |
| Φ254 × 60 | 10.00″ |
| Φ254 × 65 | 10.00″ |
| Φ254 × 70 | 10.00″ |
| Φ254 × 75 | 10.00″ |
| Φ255 × 24.5 | 10.04″ |
| Φ258 × 45 | 10.16″ |
| Φ267 × 40 | 10.51″ |
| Φ269 × 39 | 10.59″ |
| Φ269 × 40 | 10.59″ |
| Φ273 × 16 | 10.75″ |
| Φ273 × 18 | 10.75″ |
| Φ273 × 20 | 10.75″ |
| Φ273 × 22 | 10.75″ |
| Φ273 × 25 | 10.75″ |
| Φ273 × 27 | 10.75″ |
| Φ273 × 28 | 10.75″ |
| Φ273 × 30 | 10.75″ |
| Φ273 × 32 | 10.75″ |
| Φ273 × 35 | 10.75″ |
| Φ273 × 38 | 10.75″ |
| Φ273 × 40 | 10.75″ |
| Φ273 × 42 | 10.75″ |
| Φ273 × 50 | 10.75″ |
| Φ273 × 55 | 10.75″ |
| Φ273 × 60 | 10.75″ |
| Φ273 × 65 | 10.75″ |
| Φ273 × 70 | 10.75″ |
| Φ273 × 75 | 10.75″ |
| Φ273 × 80 | 10.75″ |
| Φ273.1 × 27 | 10.75″ |
| Φ285 × 17 | 11.22″ |
| Φ285 × 18 | 11.22″ |
| Φ285 × 20 | 11.22″ |
| Φ285 × 30 | 11.22″ |
| Φ285 × 50 | 11.22″ |
| Φ285 × 55 | 11.22″ |
| Φ285 × 65 | 11.22″ |
| Φ285 × 68 | 11.22″ |
| Φ285 × 70 | 11.22″ |
| Φ285 × 75 | 11.22″ |
| Φ285 × 80 | 11.22″ |
| Φ290 × 40 | 11.42″ |
| Φ299 × 16 | 11.77″ |
| Φ299 × 18 | 11.77″ |
| Φ299 × 20 | 11.77″ |
| Φ299 × 21 | 11.77″ |
| Φ299 × 22 | 11.77″ |
| Φ299 × 35 | 11.77″ |
| Φ299 × 38 | 11.77″ |
| Φ299 × 40 | 11.77″ |
| Φ299 × 42 | 11.77″ |
| Φ299 × 45 | 11.77″ |
| Φ299 × 50 | 11.77″ |
| Φ299 × 55 | 11.77″ |
| Φ299 × 60 | 11.77″ |
| Φ299 × 70 | 11.77″ |
| Φ299 × 75 | 11.77″ |
| Φ299 × 80 | 11.77″ |
| Φ299 × 85 | 11.77″ |
| Φ305 × 60 | 12.01″ |
| Φ306 × 25 | 12.05″ |
| Φ306 × 43 | 12.05″ |
| Φ306 × 45 | 12.05″ |
| Φ306 × 50 | 12.05″ |
| Φ306 × 65 | 12.05″ |
| Φ310 × 45 | 12.20″ |
| Φ323.9 × 31 | 12.75″ |
| Φ325 × 18 | 12.80″ |
| Φ325 × 20 | 12.80″ |
| Φ325 × 21 | 12.80″ |
| Φ325 × 22 | 12.80″ |
| Φ325 × 23 | 12.80″ |
| Φ325 × 24 | 12.80″ |
| Φ325 × 25 | 12.80″ |
| Φ325 × 28 | 12.80″ |
| Φ325 × 30 | 12.80″ |
| Φ325 × 32 | 12.80″ |
| Φ325 × 33 | 12.80″ |
| Φ325 × 35 | 12.80″ |
| Φ325 × 37 | 12.80″ |
| Φ325 × 38 | 12.80″ |
| Φ325 × 40 | 12.80″ |
| Φ325 × 42 | 12.80″ |
| Φ325 × 50 | 12.80″ |
| Φ325 × 55 | 12.80″ |
| Φ325 × 60 | 12.80″ |
| Φ325 × 65 | 12.80″ |
| Φ325 × 70 | 12.80″ |
| Φ325 × 80 | 12.80″ |
| Φ325 × 90 | 12.80″ |
| Φ330 × 44 | 12.99″ |
| Φ335 × 50 | 13.19″ |
| Φ340 × 35 | 13.39″ |
| Φ340 × 40 | 13.39″ |
| Φ340 × 45 | 13.39″ |
| Φ340 × 50 | 13.39″ |
| Φ340 × 67.5 | 13.39″ |
| Φ351 × 18 | 13.82″ |
| Φ351 × 19 | 13.82″ |
| Φ351 × 20 | 13.82″ |
| Φ351 × 22 | 13.82″ |
| Φ351 × 23 | 13.82″ |
| Φ351 × 25 | 13.82″ |
| Φ351 × 26 | 13.82″ |
| Φ351 × 28 | 13.82″ |
| Φ351 × 30 | 13.82″ |
| Φ351 × 32 | 13.82″ |
| Φ351 × 38 | 13.82″ |
| Φ351 × 40 | 13.82″ |
| Φ351 × 45 | 13.82″ |
| Φ351 × 55 | 13.82″ |
| Φ351 × 60 | 13.82″ |
| Φ351 × 65 | 13.82″ |
| Φ351 × 70 | 13.82″ |
| Φ351 × 75 | 13.82″ |
| Φ355.6 × 26 | 14.00″ |
| Φ355.6 × 33.5 | 14.00″ |
| Φ356 × 19 | 14.02″ |
| Φ356 × 20 | 14.02″ |
| Φ356 × 22 | 14.02″ |
| Φ356 × 24 | 14.02″ |
| Φ356 × 25 | 14.02″ |
| Φ356 × 26 | 14.02″ |
| Φ356 × 28 | 14.02″ |
| Φ356 × 30 | 14.02″ |
| Φ356 × 35 | 14.02″ |
| Φ356 × 39 | 14.02″ |
| Φ356 × 50 | 14.02″ |
| Φ356 × 55 | 14.02″ |
| Φ356 × 65 | 14.02″ |
| Φ356 × 70 | 14.02″ |
| Φ356 × 85 | 14.02″ |
| Φ356 × 95 | 14.02″ |
| Φ359 × 20 | 14.13″ |
| Φ360 × 20 | 14.17″ |
| Φ368 × 42 | 14.49″ |
| Φ368 × 45 | 14.49″ |
| Φ368 × 50 | 14.49″ |
| Φ372 × 70 | 14.65″ |
| Φ377 × 27 | 14.84″ |
| Φ377 × 28 | 14.84″ |
| Φ377 × 30 | 14.84″ |
| Φ377 × 32 | 14.84″ |
| Φ377 × 35 | 14.84″ |
| Φ377 × 40 | 14.84″ |
| Φ377 × 45 | 14.84″ |
| Φ377 × 50 | 14.84″ |
| Φ377 × 55 | 14.84″ |
| Φ377 × 60 | 14.84″ |
| Φ377 × 70 | 14.84″ |
| Φ390 × 25 | 15.35″ |
| Φ390 × 30 | 15.35″ |
| Φ390 × 32 | 15.35″ |
| Φ390 × 35 | 15.35″ |
| Φ390 × 40 | 15.35″ |
| Φ390 × 65 | 15.35″ |
| Φ390 × 70 | 15.35″ |
| Φ390 × 75 | 15.35″ |
| Φ390 × 90 | 15.35″ |
| Φ390 × 95 | 15.35″ |
| Φ402 × 20 | 15.83″ |
| Φ402 × 30 | 15.83″ |
| Φ402 × 45 | 15.83″ |
| Φ402 × 50 | 15.83″ |
| Φ402 × 55 | 15.83″ |
| Φ402 × 60 | 15.83″ |
| Φ402 × 65 | 15.83″ |
| Φ402 × 75 | 15.83″ |
| Φ402 × 80 | 15.83″ |
| Φ402 × 95 | 15.83″ |
| Φ406 × 25 | 15.98″ |
| Φ406 × 28 | 15.98″ |
| Φ406 × 32 | 15.98″ |
| Φ406 × 35 | 15.98″ |
| Φ406 × 40 | 15.98″ |
| Φ406 × 50 | 15.98″ |
| Φ406 × 55 | 15.98″ |
| Φ406 × 60 | 15.98″ |
| Φ406 × 65 | 15.98″ |
| Φ406 × 75 | 15.98″ |
| Φ406 × 80 | 15.98″ |
| Φ406.4 × 38 | 16.00″ |
| Φ408 × 65 | 16.06″ |
| Φ419 × 45 | 16.50″ |
| Φ419 × 58.5 | 16.50″ |
| Φ420 × 26 | 16.54″ |
| Φ420 × 35 | 16.54″ |
| Φ426 × 20 | 16.77″ |
| Φ426 × 21 | 16.77″ |
| Φ426 × 23 | 16.77″ |
| Φ426 × 27 | 16.77″ |
| Φ426 × 28 | 16.77″ |
| Φ426 × 29 | 16.77″ |
| Φ426 × 30 | 16.77″ |
| Φ426 × 32 | 16.77″ |
| Φ426 × 35 | 16.77″ |
| Φ426 × 37 | 16.77″ |
| Φ426 × 38 | 16.77″ |
| Φ426 × 40 | 16.77″ |
| Φ426 × 42 | 16.77″ |
| Φ426 × 45 | 16.77″ |
| Φ426 × 48 | 16.77″ |
| Φ426 × 55 | 16.77″ |
| Φ426 × 60 | 16.77″ |
| Φ426 × 62 | 16.77″ |
| Φ426 × 65 | 16.77″ |
| Φ426 × 75 | 16.77″ |
| Φ426 × 80 | 16.77″ |
| Φ426 × 85 | 16.77″ |
| Φ426 × 90 | 16.77″ |
| Φ426 × 95 | 16.77″ |
| Φ426 × 100 | 16.77″ |
| Φ428 × 25 | 16.85″ |
| Φ430 × 35 | 16.93″ |
| Φ435 × 42 | 17.13″ |
| Φ435 × 65 | 17.13″ |
| Φ435 × 105 | 17.13″ |
| Φ440 × 30 | 17.32″ |
| Φ440 × 35 | 17.32″ |
| Φ440 × 50 | 17.32″ |
| Φ440 × 55 | 17.32″ |
| Φ440 × 60 | 17.32″ |
| Φ440 × 70 | 17.32″ |
| Φ440 × 75 | 17.32″ |
| Φ440 × 80 | 17.32″ |
| Φ440 × 85 | 17.32″ |
| Φ445 × 60 | 17.52″ |
| Φ450 × 29 | 17.72″ |
| Φ450 × 30 | 17.72″ |
| Φ450 × 40 | 17.72″ |
| Φ450 × 45 | 17.72″ |
| Φ450 × 60 | 17.72″ |
| Φ450 × 65 | 17.72″ |
| Φ450 × 75 | 17.72″ |
| Φ450 × 80 | 17.72″ |
| Φ450 × 115 | 17.72″ |
| Φ455 × 85 | 17.91″ |
| Φ457 × 20 | 17.99″ |
| Φ457 × 22 | 17.99″ |
| Φ457 × 25 | 17.99″ |
| Φ457 × 27 | 17.99″ |
| Φ457 × 28 | 17.99″ |
| Φ457 × 35 | 17.99″ |
| Φ457 × 37 | 17.99″ |
| Φ457 × 38 | 17.99″ |
| Φ457 × 40 | 17.99″ |
| Φ457 × 45 | 17.99″ |
| Φ457 × 50 | 17.99″ |
| Φ457 × 55 | 17.99″ |
| Φ457 × 60 | 17.99″ |
| Φ457 × 70 | 17.99″ |
| Φ457 × 80 | 17.99″ |
| Φ457.2 × 33 | 18.00″ |
| Φ457.2 × 37 | 18.00″ |
| Φ457.2 × 42.5 | 18.00″ |
| Φ463 × 40 | 18.23″ |
| Φ470 × 30 | 18.50″ |
| Φ470 × 35 | 18.50″ |
| Φ470 × 40 | 18.50″ |
| Φ470 × 45 | 18.50″ |
| Φ471 × 30 | 18.54″ |
| Φ471 × 35 | 18.54″ |
| Φ473 × 40 | 18.62″ |
| Φ473 × 42 | 18.62″ |
| Φ475 × 45 | 18.70″ |
| Φ480 × 28 | 18.90″ |
| Φ480 × 35 | 18.90″ |
| Φ480 × 43 | 18.90″ |
| Φ480 × 55 | 18.90″ |
| Φ480 × 60 | 18.90″ |
| Φ480 × 62 | 18.90″ |
| Φ480 × 70 | 18.90″ |
| Φ480 × 90 | 18.90″ |
| Φ483 × 65 | 19.02″ |
| Φ490 × 50 | 19.29″ |
| Φ490 × 55 | 19.29″ |
| Φ490 × 70 | 19.29″ |
| Φ493 × 40 | 19.41″ |
| Φ495 × 45 | 19.49″ |
| Φ500 × 50 | 19.69″ |
| Φ508 × 30 | 20.00″ |
| Φ508 × 31 | 20.00″ |
| Φ508 × 35 | 20.00″ |
| Φ508 × 42 | 20.00″ |
| Φ508 × 47 | 20.00″ |
| Φ508 × 50 | 20.00″ |
| Φ508 × 55 | 20.00″ |
| Φ530 × 30 | 20.87″ |
| Φ530 × 38 | 20.87″ |
| Φ530 × 85 | 20.87″ |
| Φ530 × 95 | 20.87″ |
| Φ530 × 100 | 20.87″ |
| Φ530 × 110 | 20.87″ |
| Φ530 × 120 | 20.87″ |
| Φ535 × 75 | 21.06″ |
| Φ550 × 60 | 21.65″ |
| Φ550 × 80 | 21.65″ |
| Φ550 × 85 | 21.65″ |
| Φ550 × 90 | 21.65″ |
| Φ560 × 60 | 22.05″ |
| Φ560 × 65 | 22.05″ |
| Φ560 × 70 | 22.05″ |
| Φ560 × 75 | 22.05″ |
| Φ560 × 85 | 22.05″ |
| Φ560 × 110 | 22.05″ |
| Φ570 × 75 | 22.44″ |
| Φ580 × 50 | 22.83″ |
| Φ580 × 55 | 22.83″ |
| Φ580 × 60 | 22.83″ |
| Φ580 × 65 | 22.83″ |
| Φ580 × 75 | 22.83″ |
| Φ580 × 90 | 22.83″ |
| Φ580 × 110 | 22.83″ |
| Φ585 × 60 | 23.03″ |
| Φ590 × 60 | 23.23″ |
| Φ595 × 55 | 23.43″ |
| Φ600 × 40 | 23.62″ |
| Φ600 × 50 | 23.62″ |
| Φ600 × 55 | 23.62″ |
| Φ600 × 60 | 23.62″ |
| Φ600 × 75 | 23.62″ |
| Φ600 × 80 | 23.62″ |
| Φ610 × 38 | 24.02″ |
| Φ610 × 40 | 24.02″ |
| Φ610 × 42 | 24.02″ |
| Φ610 × 45 | 24.02″ |
| Φ610 × 47 | 24.02″ |
| Φ610 × 50 | 24.02″ |
| Φ610 × 55 | 24.02″ |
| Φ610 × 60 | 24.02″ |
| Φ610 × 65 | 24.02″ |
| Φ610 × 75 | 24.02″ |
| Φ610 × 85 | 24.02″ |
| Φ615 × 70 | 24.21″ |
| Φ620 × 48 | 24.41″ |
| Φ620 × 50 | 24.41″ |
| Φ620 × 70 | 24.41″ |
| Φ620 × 90 | 24.41″ |
| Φ630 × 38 | 24.80″ |
| Φ630 × 40 | 24.80″ |
| Φ630 × 45 | 24.80″ |
| Φ630 × 50 | 24.80″ |
| Φ630 × 55 | 24.80″ |
| Φ630 × 58 | 24.80″ |
| Φ630 × 60 | 24.80″ |
| Φ630 × 65 | 24.80″ |
20# — 常见问题
- 20# 对应什么国际牌号？
- 20# 最接近 ASTM A106 Gr.B, AISI 1020, JIS S20C, DIN St 35。这些是采购时通用的对照牌号；随每批货提供的质保书载有该炉号的实际化学成分和力学性能。
- 20# 有哪些规格现货？
- 目前 20# 有 465 个规格组合在库，外径从 Φ95mm 到 Φ630mm，壁厚从 15mm 到 120mm。
- 20# 可以热处理后交货吗？
- 可以。20# 可按以下交货状态供货：热轧态, 正火态, 去应力。热处理由我们自有产线在发货前完成，工艺记录与温度曲线随货提供。
- 20# 可以在发货前切割定尺吗？
- 可以。我们按定尺锯切，长度公差常规 ±1–2mm，端面垂直度 ≤1mm/100mm，材料到货即可上机，无需再车端面。