GB5310 12Cr1MoVG Boiler Steel Pipe
GB5310 12Cr1MoVG Boiler Steel Pipe: Properties, Equivalents & Applications
Detailed technical data for GB5310 12Cr1MoVG boiler steel pipe, covering chemical composition, mechanical and thermal-physical properties, international equivalent grades, similar materials, and application guidelines.
Hot rolling, hot forging, cold drawing, normalizing + tempering heat treatment
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
GB5310 12Cr1MoVG Boiler Steel Pipe Introduction
12Cr1MoVG is a low-alloy pearlitic heat-resistant steel grade specified in GB/T 5310 for seamless steel tubes used in high-pressure boilers. It is characterized by its addition of chromium, molybdenum, and vanadium, which provides excellent creep strength and oxidation resistance up to approximately 580°C. The vanadium addition refines grain structure and improves high-temperature strength stability. This steel is widely utilized for superheater, reheater, and water wall tubes in power plant boilers, as well as in petrochemical pressure equipment. It is typically supplied in normalized and tempered condition to achieve optimal mechanical properties and microstructure.
GB5310 12Cr1MoVG Boiler Steel Pipe Chemical Composition
The chemical composition of 12Cr1MoVG is defined by GB/T 5310. The steel contains controlled amounts of carbon, silicon, and manganese, with additions of chromium, molybdenum, and vanadium for high-temperature strength. Phosphorus and sulfur are kept low to ensure purity. Residual elements such as copper and nickel are limited.
- Typical values confirm to product analysis tolerances.
| Element | Standard Value | Remarks |
|---|---|---|
| C | 0.08–0.15 | Core element for strength |
| Si | 0.17–0.37 | Deoxidizer, strength contributor |
| Mn | 0.40–0.70 | Deoxidizer, improves hardenability |
| P | ≤0.025 | Impurity, kept low for toughness |
| S | ≤0.015 | Impurity, improves hot workability |
| Cr | 0.90–1.20 | Enhances oxidation and creep resistance |
| Mo | 0.25–0.35 | Increases high-temperature strength |
| V | 0.15–0.30 | Grain refinement, precipitation strengthening |
| Cu | ≤0.20 | Residual element |
| Ni | ≤0.30 | Residual element |
| Total Al | ≤0.020* | Optional control for fine grain practice |
| Other residuals | Cr+Ni+Cu ≤0.70 | As per standard agreement |
GB5310 12Cr1MoVG Boiler Steel Pipe Thermal and Electrical Physical Properties
The following physical properties represent typical data for 12Cr1MoVG in the normalized and tempered condition. They assist in design calculations for thermal expansion, heat transfer, and stress analysis. Actual values may slightly vary depending on specific heat treatment and product form.
- Density is relevant for weight estimation.
- Thermal conductivity and expansion are temperature-dependent.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Elastic modulus (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 80.8 | GPa | 20°C, calculated from E and ν |
| Poisson's ratio (ν) | 0.30 | – | 20°C |
| Thermal expansion coefficient (α) | 11.2 × 10⁻⁶ | K⁻¹ | 20–100°C |
| Thermal expansion coefficient (α) | 12.5 × 10⁻⁶ | K⁻¹ | 20–300°C |
| Thermal expansion coefficient (α) | 13.5 × 10⁻⁶ | K⁻¹ | 20–500°C |
| Thermal expansion coefficient (α) | 13.8 × 10⁻⁶ | K⁻¹ | 20–600°C |
| Thermal conductivity (λ) | 38 | W/(m·K) | 100°C |
| Thermal conductivity (λ) | 36 | W/(m·K) | 300°C |
| Thermal conductivity (λ) | 33 | W/(m·K) | 500°C |
| Specific heat capacity | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρₑ) | 0.25–0.35 | μΩ·m | 20°C |
GB5310 12Cr1MoVG Boiler Steel Pipe Mechanical Properties
Mechanical properties are determined at room temperature on longitudinal test specimens from heat-treated pipe, in accordance with GB/T 5310. The yield strength varies with wall thickness; tensile strength and elongation requirements are independent of wall thickness. Impact energy is measured on transverse Charpy V-notch specimens.
- Bend test: mandrel diameter = 3t (t = wall thickness) for 180° bending without cracks.
- Hardness: typically ≤170 HBW.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReL) | ≥255 | MPa | Wall thickness ≤16 mm, room temp. |
| Yield Strength (ReL) | ≥245 | MPa | Wall thickness >16–40 mm, room temp. |
| Yield Strength (ReL) | ≥235 | MPa | Wall thickness >40–60 mm, room temp. |
| Yield Strength (ReL) | ≥225 | MPa | Wall thickness >60 mm, room temp. |
| Tensile Strength (Rm) | 470–640 | MPa | Room temperature, longitudinal |
| Elongation after fracture (A) | ≥21 | % | Longitudinal, gauge length 5.65√So |
| Elongation after fracture (A) | ≥19 | % | Transverse, gauge length 5.65√So |
| Impact energy (KV₂) | ≥40 | J | Transverse, 20°C, standard Charpy V-notch |
| Bend test (180°) | No cracks | – | Mandrel diameter = 3×wall thickness |
GB5310 12Cr1MoVG Boiler Steel Pipe Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 5310 | 12Cr1MoVG | Original standard grade |
| Russia | GOST 20072 | 12X1MФ (12Kh1MF) | Equivalent composition and properties for boiler tubes |
| Ukraine | DSTU 7806 | 12X1MФ | Identical to GOST grade |
GB5310 12Cr1MoVG Boiler Steel Pipe Application Introduction
12Cr1MoVG steel pipe is designed for high-temperature, high-pressure service in power generation and process industries. Its good weldability and machinability make it suitable for manufacturing various pressure parts. Typical applications include:
- Superheater and reheater tubes in subcritical and supercritical boilers
- Water wall and economizer tubes
- High-temperature headers and steam piping
- Petrochemical furnace tubes and heat exchangers
Product Applications: Seamless boiler tubes, High-pressure pipe fittings (elbows, tees, reducers), Forged flanges and valve bodies, Superheater and reheater tube coils
Processed into products: Boiler superheater and reheater tube banks, Water wall panels and headers, Steam pipes and collector manifolds, Heat exchanger tubes, Furnace tubes in refineries
Application industries: Power generation (fossil fuel boilers, waste heat boilers), Petrochemical and refining, Chemical processing, Nuclear (secondary circuit piping)
GB5310 12Cr1MoVG Boiler Steel Pipe Similar/Alternative Materials with Close Properties
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 5310 | 15CrMoG | 1.0Cr-0.5Mo, no vanadium; slightly lower creep strength, used up to 550°C |
| USA | ASTM A213 | T12 (K11562) | 1.0Cr-0.5Mo, lacks vanadium; similar tensile properties but lower creep resistance |
| USA | ASTM A213 | T23 (K40712) | 2.25Cr-1.6W-V, higher creep strength but different welding requirements |
| Germany | DIN 17175 | 13CrMoV5-9 (1.7715) | 1.3Cr-1.0Mo-0.25V, higher Cr content, not fully equivalent |
| Europe | EN 10216-2 | 13CrMoV5-9 (1.7715) | Similar vanadium-strengthened grade, but Cr and Mo levels differ |
Notes:
All data are extracted from GB/T 5310-2017 and supplementary technical references. For critical applications, verify the latest standard revision and consider supplementary requirements such as ultrasonic testing, metallographic examination, and high-temperature tensile/creep tests. Welding consumables should be matched (e.g., AWS E8018-B2 or ER80S-B2L modified for vanadium). Post-weld heat treatment is typically required.
- Share
