GB 5310 15CrMoG Boiler Steel Pipe
GB 5310 15CrMoG Boiler Steel Pipe - High-Temperature Alloy for Power Generation
Detailed material data for 15CrMoG steel pipe under GB 5310 standard: chemical composition, mechanical properties, thermal and electrical physical properties, international equivalents, and application guidelines for power plant boilers and pressure vessels.
Hot rolling, cold drawing, normalizing + tempering heat treatment
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GB 5310 15CrMoG Boiler Steel Pipe Introduction
GB 5310 15CrMoG is a seamless ferritic alloy steel pipe designed for high-pressure boiler applications. With a chromium-molybdenum composition, it exhibits excellent elevated-temperature strength, oxidation resistance, and good weldability. Normally supplied in normalized and tempered condition, this grade is widely used for superheaters, reheaters, and steam pipelines in thermal power plants. Key features include:
- Controlled carbon content for optimum toughness
- Stable mechanical properties up to 550°C
- Good long-term creep rupture strength
- Compliance with rigorous Chinese boiler standards
GB 5310 15CrMoG Boiler Steel Pipe Chemical Composition
The following table lists the mandatory alloying elements and residual limits according to GB 5310-2017. Values are ladle analysis; product analysis tolerances apply.
- Trace elements like As, Sn, Sb, Pb, Bi are restricted to ensure high-temperature service integrity.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.12 – 0.18 | Required |
| Silicon (Si) | 0.17 – 0.37 | Required |
| Manganese (Mn) | 0.40 – 0.70 | Required |
| Phosphorus (P) | ≤ 0.025 | Maximum |
| Sulfur (S) | ≤ 0.015 | Maximum |
| Chromium (Cr) | 0.80 – 1.10 | Required |
| Molybdenum (Mo) | 0.40 – 0.55 | Required |
| Nickel (Ni) | ≤ 0.30 | Residual |
| Copper (Cu) | ≤ 0.20 | Residual |
| Arsenic (As) | ≤ 0.030 | Residual (max) |
| Tin (Sn) | ≤ 0.025 | Residual (max) |
| Antimony (Sb) | ≤ 0.010 | Residual (max) |
| Lead (Pb) | ≤ 0.015 | Residual (max) |
| Bismuth (Bi) | ≤ 0.010 | Residual (max) |
| Total Al | ≤ 0.025* | If Al is used for deoxidation |
| Vanadium (V) | ≤ 0.08 | Not intentionally added, typical residual |
GB 5310 15CrMoG Boiler Steel Pipe Thermal and Electrical Physical Properties
These values are representative for 1Cr-0.5Mo steel in the normalized and tempered condition. Density is for room temperature; thermal expansion and thermal conductivity vary with temperature. Note: Values are typical and not part of the standard mandatory requirements.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 210 | GPa | At 20 °C |
| Shear Modulus (G) | 81 | GPa | At 20 °C (calculated) |
| Poisson's Ratio (ν) | 0.30 | - | At 20 °C |
| Thermal Expansion (α) | 11.5 | 10⁻⁶/K | 20 – 100 °C |
| Thermal Expansion (α) | 12.5 | 10⁻⁶/K | 20 – 200 °C |
| Thermal Expansion (α) | 13.0 | 10⁻⁶/K | 20 – 300 °C |
| Thermal Expansion (α) | 13.5 | 10⁻⁶/K | 20 – 400 °C |
| Thermal Expansion (α) | 14.0 | 10⁻⁶/K | 20 – 500 °C |
| Thermal Conductivity (λ) | 44 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 200 °C |
| Thermal Conductivity (λ) | 39 | W/(m·K) | At 300 °C |
| Thermal Conductivity (λ) | 36 | W/(m·K) | At 400 °C |
| Thermal Conductivity (λ) | 33 | W/(m·K) | At 500 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.25 | μΩ·m | At 20 °C |
GB 5310 15CrMoG Boiler Steel Pipe Mechanical Properties
Tested at room temperature in accordance with GB/T 228.1. Tensile specimens are taken in the longitudinal direction. Impact tests are performed on standard Charpy V-notch specimens. The values apply to wall thicknesses as noted. Hardness is not mandatory but provided for reference.
| Property | Required Value | Unit | Test Condition / Wall Thickness |
|---|---|---|---|
| Yield Strength (ReL) | ≥ 295 | MPa | Wall thickness ≤ 16 mm |
| Yield Strength (ReL) | ≥ 285 | MPa | 16 mm < Wall thickness ≤ 30 mm |
| Yield Strength (ReL) | ≥ 275 | MPa | 30 mm < Wall thickness ≤ 50 mm |
| Tensile Strength (Rm) | 440 – 640 | MPa | All thicknesses |
| Elongation after Fracture (A) | ≥ 21 (longitudinal) | % | Gauge length 50 mm (standard round specimen) |
| Elongation after Fracture (A) | ≥ 19 (transverse) | % | Gauge length 50 mm |
| Impact Energy (KV2) | ≥ 40 (longitudinal) | J | Test temperature 20 °C |
| Impact Energy (KV2) | ≥ 27 (transverse) | J | Test temperature 20 °C |
| Hardness (HBW) | ≤ 170 | - | For reference, typical range 130-170 HBW |
| Bend Test (180°) | No cracks | - | Mandrel diameter = 3a (a = specimen thickness) |
GB 5310 15CrMoG Boiler Steel Pipe Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe/Germany | EN 10216-2 | 13CrMo4-5 (1.7335) | Chemical composition and mechanical properties align closely. Commonly used for pressure purposes. |
| Germany (historical) | DIN 17175 | 13CrMo44 | Older designation, technically equivalent to EN 13CrMo4-5. |
| Japan | JIS G3462 | STBA 22 | Cr-Mo steel for boiler and heat exchanger tubes; similar composition with slight Mn difference. |
| USA | ASTM A213/A213M | Grade T12 | Comparable alloy, but carbon range lower (0.05-0.15%) and Mo slightly higher; overall substitutable under engineering agreement. |
GB 5310 15CrMoG Boiler Steel Pipe Application Introduction
15CrMoG pipes are primarily employed in superheated steam and high-temperature water environments. The material's good mo-containing carbide stability ensures resistance to graphitization and long-term creep. Typical uses include:
- Boiler superheater and reheater tubes
- Main steam piping and hot reheat piping in subcritical power plants
- Headers and downcomers
- Furnace pressure parts in chemical and petrochemical industry
Welding requires preheating (200-300°C) and post-weld heat treatment (650-700°C) to avoid cold cracking and ensure toughness.
Product Applications: Boiler superheater tube bundles, Steam pipelines and high-pressure manifolds, Economizer tubes (for moderate temperature), Reheater assemblies, Pressure vessel nozzles and shells (when fabricated into plate form)
Processed into products: Seamless pipes and tubes (OD 10mm – 530mm, WT up to 100mm), Bent tube elements (after hot/cold bending), Forged fittings (flanges, elbows, tees) from equivalent forged grade, Welded headers and collectors, Tube sheets for shell-and-tube heat exchangers (when approved)
Application industries: Thermal power generation, Combined heat and power plants, Industrial boilers, Petrochemical and refinery furnaces, Heat recovery steam generators (HRSG)
GB 5310 15CrMoG Boiler Steel Pipe Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB 5310 | 12Cr1MoVG | Contains vanadium for improved creep strength; used for higher temperature sections (up to 580°C). |
| China | GB 5310 | 20G | Carbon steel boiler tube; limited to lower temperature/pressure service (≤ 450°C). |
| Europe | EN 10216-2 | 10CrMo9-10 (1.7380) | 2.25Cr-1Mo grade; higher creep strength but different thermal expansion. |
| USA | ASTM A335/A335M | Grade P11 | 1.25Cr-0.5Mo-Si alloy for piping; slightly higher Si content, substitute when P11 pipe is joined to 15CrMoG components. |
Notes:
- For thickness >50 mm, mechanical properties shall be agreed between manufacturer and purchaser.
- Hydrogen service or sour environments may require additional hardness and chemical restrictions (e.g., per NACE MR0175).
- The material is not intended for continuous service above 550°C due to oxidation limits and possible carbide coarsening.
- Non-destructive testing (e.g., ultrasonic, eddy current) is mandatory per GB 5310 for boiler pipe deliveries.
- International equivalents should be verified through full composition and property comparison before substitution.
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