진전
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 GB/T 8163 (fluid service) 그리고 GB/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, 공기, 석유와 가스, for boiler and heat-exchanger tubing, and for machined shafts and cylinders.
Why choose 20# 원활한 파이프
화학 성분 (wt%) — GB/T 8163 · 8162, 등급 20#
| 요소 | 탄소 (기음) | 규소 (그리고) | 망간 (망) | 황 (에스) | 인 (피) |
|---|---|---|---|---|---|
| 콘텐츠 | 0.17 – 0.24 | 0.17 – 0.37 | 0.35 – 0.65 | ≤ 0.035 | ≤ 0.035 |
메모: single values are maximum limits. Residual elements Cr ≤ 0.25, Ni ≤ 0.30, Cu ≤ 0.25 per standard. Heat analysis applies to ladle samples.
Mechanical properties — Grade 20# 원활한 파이프
| 재산 | Yield Strength ReH | 인장 강도 Rm | Elongation A | 영향 (0℃) | 경도 (approx.) |
|---|---|---|---|---|---|
| 값 | ≥ 245 MPa | 410 – 550 MPa | ≥ 20% | ≥ 27 제이 | ~ 137 HBW |
Physical properties
Common sizes & 명세서
| 외경 (mm) | 벽 두께 (mm) | 길이 | 프로세스 | 끝마무리 |
|---|---|---|---|---|
| 21.3, 25, 32, 38 | 2.8, 3.0, 3.5 | 6 중 / 12 중 | Cold drawn | Plain / 경사진 / 스레드 |
| 42, 48, 57, 60 | 3.5, 4.0, 5.0 | 6 중 / 12 중 | 열간압연 / 냉간 압연 | Plain / 경사진 |
| 76, 89, 108, 114 | 4.0, 4.5, 5.0, 6.0 | 6 중 / 12 중 | 열간압연 | Plain / 경사진 |
| 159, 168, 219, 273 | 6, 8, 10, 12 | 6 중 / 12 중 | 열간압연 | Plain / 경사진 |
| 325, 377, 426, 480, 530, 630 | 10, 12, 14, 16, 20 | 6 중 / 관습 | 열간압연 / expanded | Beveled |
Non-standard OD × WT combinations, honed tubes and special lengths are available on request.
Where 20# seamless pipe is used
- Transporting water, 공기, 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
Processing services & export packaging
스레딩 (NPT / BSP)
Honing & skiving for cylinders
표면 처리 (oiling / 그림)
Hydrostatic testing
Ultrasonic / eddy-current inspection
Hexagonal or square bundling
End caps & woven wrap for sea freight
Wooden pallet / steel frame export packing
밀 테스트 인증서 (MTC) supplied
3rd-party inspection acceptable
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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