GB5310 30Cr1MoVG Boiler Steel Pipe
GB5310 30Cr1MoVG Boiler Steel Pipe: High-Temperature Alloy Steel for Power Plants
Comprehensive material data for 30Cr1MoVG seamless steel pipe according to GB5310 standard, including chemical composition, mechanical properties at room temperature, thermal and electrical physical properties, international equivalents, similar grades, and application guide.
Hot rolling, cold drawing, normalizing + tempering, quenching + tempering, machining
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GB5310 30Cr1MoVG Boiler Steel Pipe Introduction
30Cr1MoVG is a Chinese standard alloy steel grade specified in GB 5310 for seamless steel tubes used in high-pressure boilers. It belongs to the Cr-Mo-V low-alloy heat-resistant steel family, designed for elevated temperature service up to approximately 550°C. The steel exhibits a balanced combination of moderate strength, good oxidation resistance, and improved creep strength due to the addition of vanadium. It is suitable for fabrication of superheater tubes, reheater tubes, headers, and steam pipelines in power plants. Typical delivery condition is heat-treated (normalized plus tempered or quenched plus tempered), ensuring adequate toughness and machinability. The material is not intended for severe corrosive environments but offers reliable performance under typical steam conditions in thermal power stations.
GB5310 30Cr1MoVG Boiler Steel Pipe Chemical Composition
Chemical composition limits in accordance with GB 5310-2017 for 30Cr1MoVG steel. The alloying elements chromium, molybdenum, and vanadium are the primary contributors to elevated temperature strength and oxidation resistance. Phosphorus and sulfur are strictly controlled to ensure good toughness and weldability.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.26 – 0.34 | Key hardening element |
| Silicon (Si) | 0.17 – 0.37 | Deoxidizer |
| Manganese (Mn) | 0.50 – 0.80 | Deoxidizer and strengthener |
| Phosphorus (P) | ≤ 0.025 | Impurity, low value for high-temperature service |
| Sulfur (S) | ≤ 0.015 | Impurity, low value for cleanliness |
| Chromium (Cr) | 0.90 – 1.20 | Improves oxidation resistance and creep strength |
| Molybdenum (Mo) | 0.25 – 0.35 | Increases high-temperature strength |
| Vanadium (V) | 0.15 – 0.30 | Refines grain and enhances creep strength |
| Copper (Cu) | ≤ 0.20 | Residual element |
| Nickel (Ni) | ≤ 0.30 | Residual element |
GB5310 30Cr1MoVG Boiler Steel Pipe Thermal and Electrical Physical Properties
Physical properties are typical reference values for 30Cr1MoVG alloy steel, suitable for engineering design. Actual values may vary slightly depending on manufacturing process and heat treatment. These data are based on standard material databases for low-alloy Cr-Mo-V steels.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 212 | GPa | At 20°C |
| Elastic Modulus (E) | 207 | GPa | At 100°C |
| Elastic Modulus (E) | 199 | GPa | At 200°C |
| Elastic Modulus (E) | 192 | GPa | At 300°C |
| Elastic Modulus (E) | 184 | GPa | At 400°C |
| Shear Modulus (G) | 81 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.28 – 0.30 | At 20°C | |
| Thermal Expansion (α) | 11.2 | ×10⁻⁶/K | 20 – 100°C |
| Thermal Expansion (α) | 12.0 | ×10⁻⁶/K | 20 – 200°C |
| Thermal Expansion (α) | 12.8 | ×10⁻⁶/K | 20 – 300°C |
| Thermal Expansion (α) | 13.4 | ×10⁻⁶/K | 20 – 400°C |
| Thermal Expansion (α) | 13.9 | ×10⁻⁶/K | 20 – 500°C |
| Thermal Conductivity (λ) | 35.5 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 38.1 | W/(m·K) | At 200°C |
| Thermal Conductivity (λ) | 35.6 | W/(m·K) | At 400°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20°C |
| Specific Heat Capacity (c) | 500 | J/(kg·K) | At 200°C |
| Specific Heat Capacity (c) | 540 | J/(kg·K) | At 400°C |
| Electrical Resistivity (ρ_e) | 0.23 | ×10⁻⁶ Ω·m | At 20°C |
GB5310 30Cr1MoVG Boiler Steel Pipe Mechanical Properties
Mechanical properties are specified in GB 5310-2017 for quenched and tempered or normalized and tempered condition. Longitudinal tensile test specimens are taken in accordance with the standard. Impact test is a Charpy V-notch conducted at 0°C. Hardness values are applicable after heat treatment.
| Property | Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 490 – 670 | MPa | Room temperature, longitudinal |
| Yield Strength (ReL) | ≥ 295 | MPa | Room temperature, wall thickness ≤ 16 mm |
| Yield Strength (ReL) | ≥ 285 | MPa | Room temperature, wall thickness > 16 to ≤ 40 mm |
| Yield Strength (ReL) | ≥ 275 | MPa | Room temperature, wall thickness > 40 to ≤ 60 mm |
| Yield Strength (ReL) | ≥ 265 | MPa | Room temperature, wall thickness > 60 to ≤ 100 mm |
| Elongation (A) | ≥ 18 | % | Longitudinal, L0 = 5.65 √S0 |
| Impact Energy (KV2) | ≥ 40 | J | Longitudinal, 0°C, Charpy V-notch |
| Brinell Hardness (HBW) | ≤ 170 | HBW | After heat treatment |
GB5310 30Cr1MoVG Boiler Steel Pipe Completely Equivalent Material Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| - | - | - | No direct equivalent; this grade is specific to Chinese boiler steel specification with higher carbon and vanadium. The closest international grades differ in alloy content and carbon range. |
GB5310 30Cr1MoVG Boiler Steel Pipe Application Introduction
30Cr1MoVG is primarily used in high-temperature boiler parts operating up to about 540°C under high pressure. It is suitable for manufacturing seamless tubes that are exposed to steam and flue gas in power generation and industrial boilers. The addition of vanadium provides improved creep resistance compared to plain Cr-Mo steels, making it a cost-effective choice for superheater and reheater tubing.
Product Applications: Superheater tubes and pendants, Reheater tubes, Steam headers and manifolds, Main steam piping (in moderate wall thickness applications), Furnace wall tubes (in high heat flux zones)
Processed into products: Superheater serpentine coil assemblies, Reheater tube bundles, Header stubs and links, Boiler pendant supports and spacers, High-temperature steam line expansion loops
Application industries: Thermal power generation, Industrial boiler manufacturing, Petrochemical and refining (furnace tubes), Combined heat and power plants
GB5310 30Cr1MoVG Boiler Steel Pipe Similar or Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB 5310 | 12Cr1MoVG | Lower carbon (0.08-0.15%), similar alloy concept, widely used for boiler tubes; lower room-temperature strength but excellent long-term creep properties. |
| China | GB 5310 | 15CrMoG | 1Cr-0.5Mo without vanadium; lower creep strength but good processability. |
| USA | ASTM A213 / ASME SA-213 | Grade T22 (2.25Cr-1Mo) | Higher chromium, no vanadium; used in power plants, higher oxidation resistance but different high-temperature strength profile. |
| EU | EN 10216-2 | 10CrMo9-10 (1.7380) | 2.25Cr-1Mo, similar to T22; vanadium-free, used in boilers and pressure vessels. |
| Japan | JIS G 3462 | STBA24 | 2.25Cr-1Mo steel for boiler tubes, no vanadium. |
Notes:
Heat treatment normally consists of normalizing or quenching followed by tempering to achieve the required properties. Welding should be performed with appropriate preheating and post-weld heat treatment to avoid cold cracking and to restore toughness. The steel is magnetic.
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