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GB 5310 20MnG High Pressure Boiler Tubes Quick Details
**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 requirements
Ends: Plain End, Beveled End, Threaded
Seamless steel tubes and pipes are widely used in high-pressure boiler applications. The GB 5310 standard is specifically designed for the production of seamless pipes used in steam boilers and high-pressure pipelines. Among the grades covered under this standard is **20MnG**, a commonly used material known for its strength and durability in high-temperature environments.
**Manufacturing Methods**
(1) Steel Smelting:
GB 5310 20MnG steel is typically produced using electric arc furnace with refining, oxygen converter with refining, or electroslag remelting methods.
(2) Tube Blank Production:
The tube blank can be manufactured through continuous casting, die casting, or hot rolling (forging).
(3) Final Manufacturing Process:
Steel tubes are formed through hot rolling (extrusion, expansion), or cold drawing (rolling).
**Classification & Code**
a) Hot Rolled Steel Pipe – Code: WH
b) Cold Drawn Steel Pipe – Code: WC
**Chemical Composition (%) – 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 – 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-pressure and high-temperature applications such as power plants, industrial boilers, and heat exchangers. They are known for their excellent mechanical properties, corrosion resistance, and long service life. Whether you need custom lengths or specific end finishes, we can provide tailored solutions to meet your needs.