GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate: Composition, Properties & Equivalent Grades
Complete technical data for 13MnNiMoR steel plate under GB713 standard. Chemical composition, mechanical and thermal properties, international equivalents, and application guidance.
Hot rolling, normalizing, tempering, controlled rolling, quenching and tempering (optional)
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GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate Introduction
13MnNiMoR is a low-alloy, high-strength steel plate specified in the Chinese standard GB 713 for pressure vessels and boilers. This grade is microalloyed with nickel, molybdenum, and niobium, providing excellent elevated-temperature strength, good weldability, and high resistance to creep and oxidation. Typical applications include steam drums, shells of high-pressure vessels, and components in thermal power plants and petrochemical industries. The steel is normally supplied in the normalized + tempered condition, ensuring a fine-grained microstructure with uniform mechanical properties. With strict control of impurities (low P, S), it meets the stringent requirements for safety-critical equipment operating under high temperature and pressure.
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate Chemical Composition
The chemical composition of 13MnNiMoR is carefully balanced to achieve the required combination of strength, toughness, and weldability. Ni, Mo, and Nb are the main strengthening and toughening elements; low phosphorus and sulfur contents minimize embrittlement. The carbon content is kept ≤0.15% to ensure good weldability without preheating for thin sections.
- Niobium refines grain size, enhancing both strength and low-temperature toughness.
- Molybdenum improves high-temperature strength and creep resistance.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.15 | Weldability control |
| Silicon (Si) | 0.15–0.50 | Deoxidizer |
| Manganese (Mn) | 1.20–1.60 | Strength and toughness |
| Phosphorus (P) | ≤0.020 | Residual, low for toughness |
| Sulfur (S) | ≤0.010 | Residual, low for cleanliness |
| Chromium (Cr) | ≤0.30 | Residual |
| Nickel (Ni) | 0.60–1.00 | Toughness and strength |
| Molybdenum (Mo) | 0.20–0.40 | Elevated-temperature strength |
| Copper (Cu) | ≤0.30 | Residual |
| Niobium (Nb) | 0.005–0.020 | Grain refinement |
| Aluminium (Alt) | ≥0.020 | Deoxidation, grain refinement |
| Vanadium (V) | ≤0.05 | May be present as microalloy |
| Titanium (Ti) | ≤0.030 | May be present as microalloy |
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate Thermal and Electrical Physical Properties
The physical properties given below are typical reference values for 13MnNiMoR in the normalized + tempered condition. These values may vary slightly with exact composition and heat treatment.
- Thermal expansion and conductivity data are essential for design of pressure vessels operating at elevated temperatures.
- Density and moduli are comparable to other low-alloy steels.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 206 | GPa | 20 °C |
| Shear Modulus (G) | 79.3 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | — | 20 °C |
| Thermal Expansion Coefficient (α) | 12.5 × 10⁻⁶ | K⁻¹ | 20–300 °C |
| Thermal Conductivity (λ) | 36 | W/(m·K) | 20 °C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρₑ) | ~0.25 | Ω·mm²/m | 20 °C |
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate Mechanical Properties
The mechanical properties of 13MnNiMoR are determined by the heat treatment condition and plate thickness. The steel exhibits a minimum yield strength of 390 MPa for thicknesses up to 100 mm, with high tensile strength and good elongation. Charpy impact values are guaranteed at 0 °C (also -20 °C if specified) to ensure resistance to brittle fracture.
- Bend test is required with a mandrel diameter of 3× thickness.
- Properties below are per GB 713 for normalized + tempered plate.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReL) | ≥390 | MPa | Plate thickness ≤100 mm |
| Yield Strength (ReL) | ≥380 | MPa | Plate thickness >100–150 mm |
| Tensile Strength (Rm) | 570–720 | MPa | Thickness ≤100 mm |
| Tensile Strength (Rm) | 560–720 | MPa | Thickness >100–150 mm |
| Elongation (A) | ≥18 | % | Gauge length 5.65√So, transverse |
| Charpy Impact (KV2) | ≥34 | J | At 0 °C, V-notch, transverse |
| Charpy Impact (KV2) | ≥34 | J | At -20 °C, upon agreement, transverse |
| Bend Test | d=3a | — | 180° bend, a = plate thickness |
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate International Equivalent Standards and Substitute Grades
| Country / Region | Standard | Grade / Designation | Remarks |
|---|---|---|---|
| China | GB 713 | 13MnNiMoR | Base standard |
| Europe (EN) | EN 10028-2 | 13MnNiMo5-4 (1.6323) | Identical chemical and mechanical concept |
| Germany | DIN 17155 | 13MnNiMo54; BHW35 | Historical equivalent, widely used for boiler drums |
| France | NF A36-210 | 13MnNiMo5-4 | Identical to EN version |
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate Application Introduction
13MnNiMoR is designed for applications requiring high strength, good low-temperature toughness, and resistance to creep at moderate temperatures. It is widely used in power generation and petrochemical industries for thick-walled pressure vessels and boilers. The material can be formed, welded, and machined by conventional methods. Post-weld heat treatment (PWHT) is usually required to relieve stresses and ensure toughness.
Product Applications: Steam boiler drums for subcritical and supercritical power plants, High-pressure vessel shells and heads, Heat exchanger tube sheets and channels, Chemical reactor bodies, Oil and gas field separators and knock-out drums
Processed into products: Boiler drum cylindrical courses and dished ends, Reactor shell plates and nozzle reinforcements, Flanges and blind flanges (machined from plate), Headers and manifold components, Process column structural rings
Application industries: Thermal power plants (boiler drums, headers, steam separators), Petrochemical and refinery (hydrocracking reactors, heat exchangers, high-pressure separators), Nuclear power (secondary side components, pressure boundary in non-irradiated areas), Steel mill equipment (accumulators, autoclaves), Chemical processing (ammonia converters, urea reactors)
GB713 13MnNiMoR Pressure Vessel And Boiler Steel Plate Similar / Closely Related Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB 713 | 18MnMoNbR | Higher C and Mo, no Ni, different strength level |
| USA | ASTM A533 | Type B Cl. 1 | Ni 0.40–0.70, Mo 0.45–0.60, used for nuclear vessels |
| USA | ASTM A302 | Grade B | Mn-Mo steel, no Ni, lower toughness |
| Japan | JIS G3118 | SGV480 | Carbon steel plate for boilers, significantly lower strength |
| Europe | EN 10028-2 | 13CrMo4-5 | 1.7335, Cr-Mo alloy steel, lower strength and different chemistry |
Notes:
- Welding: Preheating (≥100 °C) and interpass temperature control are recommended to avoid hydrogen cracking. Use matching filler metals (e.g., type ER80S-G).
- Post-weld Heat Treatment: Stress relieving at 620±20 °C is commonly performed to restore toughness and reduce residual stresses.
- Inspection: Ultrasonic testing per GB/T 2970 or EN 10160 is mandatory for quality verification.
- Availability: Supplied in thicknesses up to 250 mm; wider thickness range requires prior agreement.
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