Basic Product Information
| Item | Details |
| Product Name | GB 5310 20G High Pressure Seamless Steel Tube for Industrial Boiler |
| Standard | GB/T 5310-2023 (Current Chinese National Standard for Seamless Steel Tubes for High Pressure Boilers) |
| Equivalent International Grades | ASTM A106B (USA), JIS STB42 (Japan), DIN ST45.8 (Germany) |
| Material Grade | 20G (Low Carbon High Quality Structural Steel) |
| Unified Digital Code | U20252 |
| Production Process | Hot rolled (extrusion/expansion) / Cold drawn (rolled) |
| Delivery Status | Heat treated |
Chemical Composition
| Element | Content Range (%) | Maximum Allowable Content (%) |
| Carbon (C) | 0.17 - 0.24 | - |
| Silicon (Si) | 0.17 - 0.37 | - |
| Manganese (Mn) | 0.35 - 0.65 | - |
| Phosphorus (P) | - | 0.03 |
| Sulfur (S) | - | 0.03 |
| Chromium (Cr) | - | 0.25 |
| Molybdenum (Mo) | - | 0.15 |
| Copper (Cu) | - | 0.2 |
| Nickel (Ni) | - | 0.25 |
| Vanadium (V) | - | 0.08 |
Mechanical Properties
| Property | Requirement |
| Tensile Strength (Rm) | 410 - 550 MPa |
| Yield Strength (Re) | ≥ 245 MPa |
| Elongation (A) | ≥ 24 % |
| Impact Energy (KV2) | ≥ 35 J |
| Hardness (Hot Rolled) | ≤ 156 HBS |
Product Specification Range
| Parameter | Range |
| Outer Diameter (OD) | 16 mm - 824 mm |
| Wall Thickness (WT) | 2 mm - 65 mm |
| Length | 6 m / 12 m or customized as required |
| End Processing | Plain end, beveled end, threaded end |
Dimensional Tolerance
| Tolerance Grade | Allowable Outer Diameter Deviation |
| D1 | ±1.5%, minimum ±0.75 mm |
| D2 | ±1.0%, minimum ±0.50 mm |
| D3 | ±0.75%, minimum ±0.30 mm |
| D4 | ±0.50%, minimum ±0.10 mm |
Working Condition Application
| Application Scenario | Maximum Long-term Operating Temperature |
| Boiler heating surface pipes | ≤ 450 ℃ |
| Boiler headers and steam pipes | ≤ 425 ℃ |
Key Product Features
| Feature | Description |
| High Temperature Stability | Maintains high persistent strength and structural stability under long-term high temperature and high pressure working conditions |
| Excellent Corrosion Resistance | Good oxidation resistance to resist corrosion from high temperature flue gas and steam |
| Good Processing Performance | Low carbon content provides excellent plasticity, toughness, and cold/hot forming performance, with reliable welding performance |
| Material Efficiency | Compared with solid steel, it has higher strength-to-weight ratio, reduces engineering material cost |
| Strict Quality Control | All products undergo hydrostatic test, flattening test, flaring test, and non-destructive testing (ultrasonic testing, eddy current testing) to ensure compliance with standard requirements |
Main Applications
★Industrial and utility high-pressure boiler heating surface tubes: water wall, superheater, reheater, economizer.
★High pressure steam pipelines and boiler headers.
★Petrochemical industrial pressure vessels and process piping.
★Biomass power generation, solar thermal power generation high temperature pipelines.
★Metallurgy, central heating, shipbuilding and other industrial high-temperature pressure piping systems.
Quality Guarantee
All our GB 5310 20G high pressure seamless steel tubes are produced by leading domestic steel mills, with complete material test certificates, and comply with all inspection requirements of GB/T 5310-2023 standard including chemical composition, mechanical properties, metallographic structure, grain size, and decarburization layer. Customized specifications and processing services are available according to project requirements.
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