进步
A reliable seamless pipe for pressure and structure
20# is a high-quality carbon structural steel widely used for seamless pipes. Produced by hot rolling or cold drawing without any weld seam, it delivers a smooth bore, uniform wall and dependable pressure resistance to 国标/T 8163 (fluid service) 和 国标/T 8162 (structural service).
With a balanced composition of carbon, silicon and manganese, 20# pipe offers good strength, excellent machinability and weldability, and stable performance at moderate temperatures — the first-choice material for conveying water, 空气, 石油和天然气, for boiler and heat-exchanger tubing, and for machined shafts and cylinders.
Why choose 20# seamless pipe
化学成分 (重量%) —GB/T 8163 · 8162, 年级 20#
| 元素 | 碳 (C) | 硅 (和) | 锰 (锰) | 硫 (S) | 磷 (磷) |
|---|---|---|---|---|---|
| 内容 | 0.17 – 0.24 | 0.17 – 0.37 | 0.35 – 0.65 | ≤ 0.035 | ≤ 0.035 |
笔记: single values are maximum limits. Residual elements Cr ≤ 0.25, Ni ≤ 0.30, Cu ≤ 0.25 per standard. 热分析适用于钢包样品.
Mechanical properties — Grade 20# seamless pipe
| 财产 | 屈服强度ReH | 拉伸强度Rm | 伸长率A | 影响 (0℃) | 硬度 (约。) |
|---|---|---|---|---|---|
| 价值 | ≥ 245 兆帕 | 410 – 550 兆帕 | ≥ 20% | ≥ 27 J | 〜 137 HBW |
物理特性
常用尺寸 & 规格
| 外径 (毫米) | 室壁厚度 (毫米) | 长度 | 过程 | End Finish |
|---|---|---|---|---|
| 21.3, 25, 32, 38 | 2.8, 3.0, 3.5 | 6 米 / 12 米 | Cold drawn | Plain / beveled / threaded |
| 42, 48, 57, 60 | 3.5, 4.0, 5.0 | 6 米 / 12 米 | Hot rolled / 冷拔 | Plain / beveled |
| 76, 89, 108, 114 | 4.0, 4.5, 5.0, 6.0 | 6 米 / 12 米 | Hot rolled | Plain / beveled |
| 159, 168, 219, 273 | 6, 8, 10, 12 | 6 米 / 12 米 | Hot rolled | Plain / beveled |
| 325, 377, 426, 480, 530, 630 | 10, 12, 14, 16, 20 | 6 米 / custom | Hot rolled / expanded | Beveled |
Non-standard OD × WT combinations, honed tubes and special lengths are available on request.
Where 20# seamless pipe is used
- Transporting water, 空气, oil, gas and steam
- Boiler tubes and heat exchanger tubing
- Hydraulic cylinders, honed tubes and pistons
- Machined shafts, spindles and mechanical parts
- Steel structures and scaffolding systems
- Automotive and agricultural equipment
加工服务 & 出口包装
Threading (NPT / BSP)
Honing & skiving for cylinders
表面处理 (oiling / 绘画)
Hydrostatic testing
Ultrasonic / eddy-current inspection
Hexagonal or square bundling
End caps & woven wrap for sea freight
木托盘 / steel frame export packing
工厂测试证书 (MTC) 提供的
3可接受第三方检验
Tell us your OD, wall thickness and length — we reply within 24 hours with a competitive quote, stock status and delivery schedule.
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