Product Overview：
Seamless steel pipes for boilers can be divided into medium and low pressure boiler pipes and high-pressure boiler pipes, which belong to a type of seamless steel pipe. There are strict requirements for the steel grades used in the manufacturing of steel pipes. Seamless steel pipes for boilers are often subjected to high temperature and high pressure conditions, and the pipes will undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durability, high resistance to oxidation and corrosion, and good structural stability. Seamless steel pipes for boilers are mainly used to manufacture superheater pipes, reheater pipes, air ducts, main steam pipes, etc. for medium and low pressure and high pressure boilers.
| Product List |
| Product Name: | Medium and low pressure boiler tubes | Seamless steel tubes |
| Product Name: | High pressure boiler tube | seamless steel tube |
| Product Name: | GB3087 Seamless Steel Tubes for Low and Medium Pressure Boilers | Seamless Tubes |
| Product Name: | GB5310 Seamless Steel Tubes for High Pressure Boilers |
| Product Name: | Seamless steel pipe for 20G high-pressure boiler | Seamless pipe |
| Product Name: | Seamless steel pipe for national standard boilers |
| Parameter range |
| Outer diameter | Φ6mm‑Φ219mm |
| Wall thickness | 0.5mm‑20mm |
| Standard length | 1‑12m， Support customization of short and long scales |
| Outer diameter accuracy | Maximum ± 0.03mm |
| Executive Standards | ASTM A106,ASME SA335, EN 10216-2, GB/T 5310 |
| Non-standard customization | Customization of pressure wall thickness, precision machining of inner holes, heat-resistant heat treatment, groove processing, and high temperature and anti-corrosion resistance can all be customized |
| Low medium pressure boiler tubes GB/T 3087-2022 | Material: 20# |
| Outer diameter (mm) | 25
| 32 | 38 | 42 | 48 | 57 | 60 | 76 | 89 | 108
|
| Common wall thickness (mm) | 2.5、3.0、4.0 | 3.0、3.5、4.0 | 3.0、3.5、4.5 | 3.5、4.0、5.0 | 3.5、4.0、5.0、6.0 | 3.5、4.0、5.0、6.0 | 4.0、5.0、6.0、7.0
| 4.0、5.0、6.0、8.0 | 4.5、5.0、6.0、8.0 | 4.5、5.0、6.0、8.0 |
| High pressure boiler tube GB/T 5310-2023 | Material: 20G, 15CrMoG, 12Cr1MoVG |
| Outer diameter (mm) | 32
| 38 | 42 | 48 | 51 | 57 | 60 | 76 | 89
| 108 |
| Common wall thickness (mm) | 4.0、4.5、5.0 | 4.5、5.0、6.0 | 5.0、6.0、7.0 | 5.0、6.0、8.0 | 5.0、6.0、8.0 | 6.0、7.0、8.0、10.0 | 6.0、8.0、10、12 | 8.0、10.0、12.0、14.0 | 8.0、10.0、12.0、14.0 | 10.0、12.0、14.0、16.0 |
Optional tolerance range |
| Tolerance control | Optional manufacturing process |
| Tolerance ≤ 0.05 mm | Cold rolling |
| Tolerance ≤ 0.10 mm | Cold rolling |
| Tolerance ≤ 0.30 mm | Cold drawing | Cold rolling |
| Tolerance ≤ 0.50 mm | Cold drawing | Hot rolling |
| Tolerance ≤ 1.00 mm | Hot rolling | Hot expanding |
| Low and medium pressure boiler tubes GB/T 3087-2022 |
| Hot rolled pipe |
| Outer diameter D (mm) | Outer diameter deviation (mm) | Wall thickness deviation |
| ≤159 | ± 1.0% D, minimum | ±0.50+15%S /‑10%S |
| ＞159 | ±1.0%D | +15%S /‑10%S |
| Cold drawn/cold-rolled pipes |
| Outer diameter D (mm) | Outer diameter deviation (mm) | Wall thickness deviation |
| ≤30 | ±0.30 | +12.5%S /‑10%S |
| 30‑50 | ±0.30 | +12.5%S /‑10%S |
| ＞50 | ±1.0%D | +12.5%S /‑10%S |
| High pressure boiler tubes GB/T 5310-2023 |
| Hot rolled pipe |
| Outer diameter D (mm) | Outer diameter deviation (mm) | Wall thickness deviation |
| ≤159 | ± 1.0% D, minimum ± 0.50 | +15%S /‑10%S |
| ＞159 | ±1.0%D | +12.5%S /‑10%S |
| Cold drawn/cold-rolled pipes |
| Outer diameter D (mm) | Outer diameter deviation (mm) | Wall thickness deviation |
| ≤25.4 | ±0.15 | S≤3：±0.30；S＞3：±10%S |
| 25.4‑40 | ±0.20 | S≤3：±0.30；S＞3：±10%S |
| 40‑50 | ±0.25 | S≤3：±0.30；S＞3：±10%S |
| 50‑60 | ±0.30 | S≤3：±0.30；S＞3：±10%S |
| ＞60 | ±0.5%D | S≤3：±0.30；S＞3：±10%S |
| General geometric tolerances |
| Project | Indicator |
| Ovalness | ≤ 80% outer diameter tolerance |
| Straightness | ≤1.5 mm/m |
| S=nominal wall thickness (mm); Advanced precision needs to be specified in the contract |
Optional delivery status
|
| Oil removal from oil pipes | Annealing and straightening | Steel pipe corrosion prevention |
| Steel pipe threading | Length cut-to-length | Steel pipe coating |
| Steel pipe cap | Exquisite bundling | Beveling |
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