**GB 5310 20MnG High Pressure Boiler Tubes – Quick Overview**
Standard: GB 5310
Manufacturing Process: Seamless, Hot-finished or Cold-finished
Wall Thickness (WT): 2.8 mm to 150 mm
Outer Diameter (OD): 23 mm to 1500 mm
Length: 6 meters or as per customer specifications
Ends: Plain End, Beveled End, Threaded
These seamless steel tubes and pipes are designed for high-pressure boiler applications and meet the GB 5310 standard. Specifically, the GB 5310 20MnG grade is widely used in steam boilers and pipelines that require high strength and thermal resistance.
**Manufacturing Methods**
(1) Steel Smelting: The 20MnG steel is produced using electric arc furnace with refining, oxygen converter with refining, or electroslag remelting techniques.
(2) Tube Blank Production: The tube blanks can be manufactured through continuous casting, die casting, or hot rolling/forging.
(3) Tube Manufacturing: The final steel tubes are made by hot rolling, extrusion, expansion, or cold drawing/rolling.
**Classification & Codes**
a) Hot Rolled Steel Pipe – Code: WH
b) Cold Drawn Steel Pipe – Code: WC
**Chemical Composition (%) of GB 5310-2008**
| Steel Grade | C | Si | Mn | P | S | Cr | Mo | Cu | Ni | V |
|-------------|-------|-------|-------|-------|-------|-------|-------|-------|-------|-------|
| 20G | 0.17–0.24 | 0.17–0.37 | 0.35–0.65 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 20MnG | 0.17–0.24 | 0.17–0.37 | 0.70–1.00 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 25MnG | 0.18–0.24 | 0.17–0.37 | 0.80–1.10 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 |
| 15CrMo | 0.12–0.18 | 0.17–0.37 | 0.40–0.70 | ≤0.030 | ≤0.030 | 0.80–1.10 | 0.40–0.55 | ≤0.20 | ≤0.30 | - |
| 12Cr2MoG | 0.08–0.15 | ≤0.50 | 0.40–0.70 | ≤0.030 | ≤0.030 | 2.00–2.50 | 0.90–1.20 | ≤0.20 | ≤0.30 | - |
| 12Cr1MoV | 0.08–0.15 | 0.17–0.37 | 0.40–0.70 | ≤0.030 | ≤0.030 | 0.90–1.20 | 0.25–0.35 | ≤0.20 | ≤0.30 | 0.15–0.30 |
| 12Cr2MoWVTiB | 0.08–0.15 | 0.45–0.75 | 0.45–0.65 | ≤0.030 | ≤0.030 | 1.60–2.10 | 0.50–0.65 | ≤0.20 | ≤0.30 | 0.28–0.42 |
| 10Cr9Mo1VNb | 0.08–0.12 | 0.20–0.50 | 0.30–0.60 | ≤0.020 | ≤0.010 | 8.00–9.50 | 0.85–1.05 | ≤0.20 | ≤0.40 | 0.18–0.25 |
**Mechanical Properties of GB 5310-2008**
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|-----------------|----------------------|-------------------------|----------------|
| 20G | 410–550 | 245 | 24 |
| 20MnG | ≥415 | 240 | 22 |
| 25MnG | ≥485 | 275 | 20 |
| 15MoG | 450–600 | 270 | 22 |
| 12CrMoG | 410–560 | 205 | 21 |
| 12Cr2MoG | 450–600 | 280 | 20 |
| 12Cr1MoVG | 470–640 | 255 | 21 |
| 12Cr2MoWVTib | 540–735 | 345 | 18 |
| 10Cr9Mo1VNb | ≥585 | ≥415 | ≥20 |
These tubes are ideal for high-temperature and high-pressure environments such as power plants, industrial boilers, and chemical processing systems. They offer excellent mechanical properties, corrosion resistance, and thermal stability. If you need customized sizes, finishes, or specifications, feel free to contact us for a detailed quotation.
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