Seamless Pipe Manufacturer In China
Products Description
1.Outer Diameter (OD): Ranges from 6 mm to over 650 mm, depending on production method.
Hot-rolled: Typically 32–650 mm.
Cold-drawn/cold-rolled: As small as 6 mm, with tight tolerances (e.g., ±0.1 mm).
2.Wall Thickness: From 0.25 mm (precision tubes) up to 200 mm (heavy-walled pipes).
3.Length: Standard lengths range from 5–12 m, but can be produced in longer continuous forms before cutting.
4.Common Standards:
ASTM A106, A53 (carbon steel),API 5L (pipeline),GB/T 8163, GB 5310,etc.
Chemical Composition
| Type | Key Elements (mass %) | Example Grades |
| Carbon Steel | C: 0.1–0.45%, Mn: 0.35–1.6%, Si: ≤0.37% | 10#, 20#, 45#, Q345B |
| Alloy Steel | Adds Cr, Mo, V; e.g., Cr: 0.8–1.1% | 40Cr, 35CrMo |
| Stainless Steel | Cr: ≥15%, Ni: ≥8%, C: ≤0.08% | 304 (18/8), 316 (16% Cr, 10% Ni, 2–3% Mo) |
| Duplex Stainless | Cr: 20–35%, Ni: 1–15%, N: 0.15–0.4% | Specialized for offshore and sour service |
Mechanical Properties
Tensile Strength: 450–750 MPa (carbon/low-alloy), up to 900+ MPa for high-strength grades.
Yield Strength: 245–690 MPa, depending on grade and processing.
Elongation: ≥ 20%, ensuring good ductility.
Impact Toughness: Critical for low-temperature service; e.g., Q345D requires impact testing at –20°C.
Hardness: Controlled to prevent cracking; e.g., HRC ≤ 22 for sour service environments.
Applications
1.Oil & Gas: Drill pipes, casing, tubing, pipelines (especially sour service with H₂S resistance).
2.Power Plants: High-pressure boiler tubes, superheater pipes.
3.Chemical Industry: Reactor vessels, heat exchangers.
4.Mechanical Engineering: Hydraulic cylinders, automotive shafts, bearing housings.
5.Construction & Infrastructure: Structural supports, piling.
6.Shipbuilding & Offshore Platforms: Critical load-bearing and fluid transport systems.
Why Choose Seamless Pipe Manufacturer In China?
| Advantage | Explanation |
| Cost Efficiency | Prices are typically 20–30% lower than Western counterparts, ideal for large-scale procurement. |
| Production Flexibility | Capable of producing small batches or mass orders with fast turnaround (some offer 36-hour emergency delivery). |
| Technical Maturity | Mastery of hot rolling, cold drawing, PQF rolling, and solution annealing ensures high precision and reliability. |
| International Compliance | Leading mills provide Mill Test Reports (MTRs), hydrostatic testing, and NDT reports (UT/ECT), meeting API, ASTM, and GB standards. |
| Export Readiness | Strong logistics network via ports like Qingdao and Shanghai enables efficient global shipment, especially along "Belt and Road" routes. |
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