12Cr1MoVG Seamless Steel Boiler Tube Material
12Cr1MoV Seamless Steel Pipe per GB/T 8162 – Alloy Structural Tube for High-Temperature Service
Explore 12Cr1MoV seamless steel pipe under GB/T 8162: chemical composition, mechanical properties, thermal and electrical physical data, international equivalents, and application guide for structural and high-temperature components.
Hot rolled, hot expanded, cold drawn, cold rolled; heat treatment: normalizing + tempering (or as specified by customer)
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12Cr1MoVG Seamless Steel Boiler Tube Introduction
12Cr1MoV is a Cr-Mo-V low-alloy structural steel supplied as seamless pipes according to GB/T 8162 (Seamless Steel Tubes for Structural Purposes). This grade exhibits a good combination of strength, toughness, and oxidation resistance at elevated temperatures up to approximately 550 °C, making it suitable for structural parts in boilers, pressure vessels, and piping systems. The steel is characterized by its balanced composition:
- Chromium (0.90–1.20%) provides improved corrosion and oxidation resistance.
- Molybdenum (0.25–0.35%) enhances creep strength and resistance to softening at high temperatures.
- Vanadium (0.15–0.30%) refines grain size and contributes to elevated-temperature strength.
Delivery condition is typically normalized or normalized and tempered, achieving a ferritic-pearlitic microstructure. Pipes are mainly used in power plants, petrochemical plants, and general mechanical engineering where reliable performance under thermal stress is required.
12Cr1MoVG Seamless Steel Boiler Tube Chemical Composition
Chemical requirements for 12Cr1MoV seamless steel pipes in accordance with GB/T 8162-2008. Elements are controlled to ensure high-temperature strength and weldability. Trace elements like phosphorus and sulfur are restricted to minimize brittleness and hot cracking.
| Element | Specified Value | Remarks |
|---|---|---|
| Carbon (C) | 0.08–0.15 | Core hardenability and strength control |
| Silicon (Si) | 0.17–0.37 | Deoxidizer, improves scaling resistance |
| Manganese (Mn) | 0.40–0.70 | Deoxidizer, counteracts sulfur brittleness |
| Phosphorus (P) | ≤ 0.035 | Considered residual impurity |
| Sulfur (S) | ≤ 0.035 | Considered residual impurity |
| Chromium (Cr) | 0.90–1.20 | Enhances oxidation and creep resistance |
| Molybdenum (Mo) | 0.25–0.35 | Increases hot strength and hardenability |
| Vanadium (V) | 0.15–0.30 | Grain refinement, secondary hardening |
12Cr1MoVG Seamless Steel Boiler Tube Thermal & Electrical Physical Properties
Typical physical properties for 12Cr1MoV steel at ambient and elevated temperatures. Values are based on published data for this ferritic-pearlitic grade and serve as engineering references. Actual values may vary slightly depending on heat treatment and exact composition.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | 81 | GPa | 20 °C |
| Poisson's Ratio (ν) | 0.30 | - | 20 °C |
| Thermal Expansion Coefficient (α) | 11.5 | ×10⁻⁶ /K | 20–200 °C |
| Thermal Expansion Coefficient (α) | 12.5 | ×10⁻⁶ /K | 20–400 °C |
| Thermal Expansion Coefficient (α) | 13.2 | ×10⁻⁶ /K | 20–550 °C |
| Thermal Conductivity (λ) | 40 | W/(m·K) | 100 °C |
| Thermal Conductivity (λ) | 36 | W/(m·K) | 300 °C |
| Thermal Conductivity (λ) | 32 | W/(m·K) | 500 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρ_e) | 0.16 | μΩ·m | 20 °C |
12Cr1MoVG Seamless Steel Boiler Tube Mechanical Properties
Longitudinal tensile and impact properties for seamless pipes of 12Cr1MoV supplied under GB/T 8162. Requirements apply to wall thicknesses up to 30 mm (consult standard for specific grouping). Properties are achieved after normalizing at 970–1000 °C and tempering at 720–760 °C. Values are guaranteed at room temperature unless noted otherwise.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 490 | MPa | Room temperature, longitudinal specimen |
| Yield Strength (ReL) | ≥ 245 | MPa | Room temperature, lower yield |
| Elongation after Fracture (A) | ≥ 22 | % | Longitudinal, gauge length 5.65√S0 |
| Elongation after Fracture (A) | ≥ 20 | % | Transverse, gauge length 5.65√S0 |
| Bend Test (Cold) | D = 3a, 180° | - | For wall thickness ≤ 20 mm, no cracks |
| Impact Energy (KV2) | ≥ 40 (reference) | J | Optional, 20 °C, longitudinal V-notch |
12Cr1MoVG Seamless Steel Boiler Tube Complete Equivalent Material Standards & Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Russia / CIS | GOST 20072 | 12X1MФ (12Kh1MF) | Direct equivalent, widely used in boiler tubes |
| China | GB/T 5310 | 12Cr1MoV | Same chemical composition, specific for boiler tubes; often dual-certified with GB/T 8162 |
12Cr1MoVG Seamless Steel Boiler Tube Application Introduction
12Cr1MoV seamless pipes are employed in engineering fields where structures must withstand elevated temperatures and oxidation. Its combination of moderate ductility and high-temperature strength allows reliable service in power generation, petrochemical and marine industries. Typical applications include:
- Boiler components: superheater and reheater tubes, waterwall tubes, headers.
- Steam pipelines: main steam lines and hot reheat pipes operating up to about 550 °C.
- Structural parts: high-temperature frames, hangers, and supports in industrial furnaces.
The material can be easily welded with preheating and post-weld heat treatment (PWHT), and can be processed by conventional machining and cold forming operations.
Product Applications: Boiler superheaters, reheaters, and economizers, High-pressure steam and hot water piping, Heat exchangers and condensers, Structural supports in high-temperature environments, Flanges and pipe fittings (after forging)
Processed into products: Seamless boiler tubes, Steam turbine piping sections, Furnace conveyors and grates, High-temperature bolting, Nozzle stubs and stub ends, Pressure vessel shells (hot-formed)
Application industries: Thermal Power Plants, Petrochemical Industry, Oil and Gas Refineries, Marine Engineering, Nuclear Power (secondary circuit components)
12Cr1MoVG Seamless Steel Boiler Tube Similar/Close Substitute Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10216-2 | 13CrMoV4-5 (1.7335) | Higher Mo (0.45-0.65%), similar Cr-V, common in power plant piping |
| China | GB/T 8162 / GB/T 5310 | 15CrMo (1.25Cr-0.5Mo) | Lower alloy grade, no V, lower creep strength, suitable for less demanding temperatures |
| USA | ASTM A335 / A213 | T12 / P12 (1Cr-0.5Mo) | Low alloy Cr-Mo steel without V, used for moderate high-temperature service |
| Japan | JIS G3458 | STPA23 (1Cr-0.5Mo) | Equivalent to A335 P12, lacks vanadium; for lower temperature applications |
Notes:
Note: Although GB/T 8162 lists 12Cr1MoV as a structural tube, actual boiler applications usually refer to GB/T 5310 (Seamless steel tubes for high-pressure boiler). Dual certification is common when the pipe meets both structural and boiler requirements. For high-temperature design, long-term creep-rupture data per GB 5310 should be consulted. The data provided are typical; exact values shall be verified against the purchaser's specification and the applicable standard version.
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