DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels
DIN 17155 13CrMo44: Cr-Mo Alloy Steel Plate for Elevated Temperature Pressure Vessels and Boilers
Detailed material data sheet for DIN 17155 13CrMo44, a chromium-molybdenum alloy steel plate designed for pressure vessels and boilers operating at elevated temperatures, including chemical composition, mechanical properties, physical properties, and international equivalents.
Hot rolling, normalizing, tempering, welding (with preheat and PWHT), machining, cold forming (limited, may require stress relieving)
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DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Introduction
DIN 17155 13CrMo44 is a low-alloy chromium-molybdenum steel plate specifically developed for welded pressure vessels and boilers in elevated temperature service. It offers good creep resistance and high-temperature strength up to approximately 530 °C. The material is widely used in the fabrication of steam boilers, pressure vessels, heat exchangers, and piping components. It provides good weldability with proper preheating and post-weld heat treatment, and exhibits reliable toughness after tempering. The standard has been superseded by EN 10028-2 13CrMo4-5, but 13CrMo44 remains a common reference in legacy equipment and supply chains.
DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Chemical Composition
Heat analysis according to DIN 17155. The steel is microalloyed with chromium and molybdenum to enhance high-temperature strength and oxidation resistance. Residual elements are controlled to ensure weldability and toughness.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.10 – 0.18 | |
| Silicon (Si) | 0.10 – 0.35 | Deoxidation element |
| Manganese (Mn) | 0.40 – 0.70 | Desulfurizing and strengthening agent |
| Phosphorus (P) | ≤ 0.035 | Maximum when ladle analyzed |
| Sulfur (S) | ≤ 0.035 | Maximum when ladle analyzed |
| Chromium (Cr) | 0.70 – 1.00 | Main alloying element for creep strength |
| Molybdenum (Mo) | 0.40 – 0.60 | Enhances high-temperature strength |
| Copper (Cu) | ≤ 0.30 | Residual element |
| Nickel (Ni) | ≤ 0.30 | Residual element |
| Nitrogen (N) | ≤ 0.012 | When not intentionally added |
DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Thermal and Electrical Physical Properties
Typical physical properties at room temperature and elevated temperatures. Data are for guidance and not part of DIN 17155 specification requirements.
| Property | Standard Requirement Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of elasticity (E) | 210 | GPa | At 20 °C |
| Shear modulus (G) | 81 | GPa | At 20 °C, calculated from E and ν |
| Poisson's ratio (ν) | 0.30 | Typical value for steel | |
| Thermal expansion coefficient (α) | 11.1 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal expansion coefficient (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20 – 200 °C |
| Thermal expansion coefficient (α) | 13.2 × 10⁻⁶ | K⁻¹ | 20 – 400 °C |
| Thermal expansion coefficient (α) | 14.0 × 10⁻⁶ | K⁻¹ | 20 – 600 °C |
| Thermal conductivity (λ) | 44 | W/(m·K) | At 20 °C |
| Thermal conductivity (λ) | 42 | W/(m·K) | At 200 °C |
| Thermal conductivity (λ) | 38 | W/(m·K) | At 400 °C |
| Thermal conductivity (λ) | 34 | W/(m·K) | At 600 °C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρₑ) | 0.20 | Ω·mm²/m | At 20 °C |
DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Mechanical Properties
Minimum properties at room temperature in normalized and tempered condition, testing direction transverse unless otherwise noted. Properties depend on product thickness.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 300 | MPa | Thickness ≤ 16 mm |
| Yield strength (ReH) | ≥ 290 | MPa | Thickness > 16 to ≤ 40 mm |
| Yield strength (ReH) | ≥ 280 | MPa | Thickness > 40 to ≤ 60 mm |
| Tensile strength (Rm) | 440 – 590 | MPa | All thicknesses |
| Elongation (A) | ≥ 22 | % | Longitudinal, gage length 5.65√S₀ (proportional) for thickness ≤ 16 mm |
| Elongation (A) | ≥ 21 | % | Longitudinal, thickness > 16 to ≤ 40 mm |
| Elongation (A) | ≥ 19 | % | Longitudinal, thickness > 40 to ≤ 60 mm |
| Impact energy (KV) | ≥ 27 (−20 °C) | J | Transverse, V-notch, average of 3 specimens, min. single value 21 J |
| Bend test (mandrel diameter) | d = 3a (thickness ≤ 25 mm) | 180° bend, crack-free |
DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Fully Equivalent Grade Standards and Substitute Recommendations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| Europe | EN 10028-2 | 13CrMo4-5 | Direct successor to DIN 17155 13CrMo44; chemical and mechanical requirements essentially identical |
| Germany | DIN 17155 (withdrawn) | 13CrMo44 | Original specification |
| United Kingdom | BS 1501-622 (withdrawn) | 622-460 | Comparable Cr-Mo boiler steel, now replaced by EN 10028-2 |
| France | NF A36-206 (historic) | 15CD2.05 | Similar heat-resistant steel, former French standard |
| Japan | JIS G4109 | SCMV 2-2 | Chemical composition closely matches, mechanical properties slightly different |
| China | GB 713 | 15CrMoR | Equivalent Cr-Mo steel for pressure vessels, minor differences in carbon content |
| International | ISO 9328-2 | 11CrMo9-10 | Higher Cr-Mo grade, not a direct equivalent but used for similar applications |
DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Application Introduction
DIN 17155 13CrMo44 steel plate is primarily utilized in the manufacture of welded pressure vessels and boilers operating at elevated temperatures up to 530 °C. It is suitable for service in steam, hot water, and hydrocarbon environments where creep resistance and thermal stability are required. The normalized and tempered condition provides a balanced microstructure of ferrite and bainite with fine carbides, ensuring long-term reliability under cyclic thermal stress. Fabrication involves common hot and cold forming, machining, and welding with appropriate preheat and post-weld heat treatment to avoid cold cracking and stress corrosion cracking. It is often used in power generation, chemical processes, and oil refining equipment.
Product Applications: Steam boilers and waste heat boilers, High-pressure heat exchangers and reboilers, Reactor pressure vessels (for moderate temperature hydrogen service), Superheater and reheater headers, Steam drums and mud drums, Hot-wall cracking furnaces
Processed into products: Boiler shells and end plates (heads), Tube sheets and baffles for heat exchangers, Flanges, reinforcing pads, and nozzle bodies, Transition pieces and manhole covers, Support skirts and bracket plates for tall columns, Piping elbows and thick-walled reducers (plate-formed)
Application industries: Power generation (thermal power plants, nuclear secondary circuits), Chemical and petrochemical processing, Oil & gas refining (hydrocrackers, catalytic reformers), Industrial boiler manufacturing, Heat exchanger and pressure vessel fabrication, Waste incineration and biomass energy plants
DIN 17155 13CrMo44 Alloy Steel for Pressure Vessels Similar / Alternative Material Recommendations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A387 | Grade 12 Class 2 | Cr-Mo alloy steel plate for pressure vessels; slightly higher Cr content (0.80-1.15%), Mo 0.45-0.60%, tensile strength 450-585 MPa. Comparable service temperature |
| Europe | EN 10028-2 | 13CrMoSi5-5 | Additional silicon (0.50-0.80%) for improved oxidation resistance; often used for higher temperature or scaling conditions |
| Germany | DIN 17155 (withdrawn) | 15Mo3 | Simple Mo-alloyed steel (0.30% Mo), lower strength at elevated temperatures, thinner sections only, predecessor to 13CrMo44 for less demanding service |
| China | GB 5310 | 15CrMoG | Seamless steel tube grade with similar Cr-Mo composition but slightly different mechanical requirements, used in boilers |
| International | ISO 9328-2 | 13CrMo4-5 | Identical to EN grade, globally recognized equivalent |
Notes:
Welding Recommendations: Preheating to 150–250 °C is required depending on thickness; post-weld heat treatment (PWHT) at 620–680 °C for stress relief and tempering. Low hydrogen electrodes or processes (e.g., GTAW, SMAW) should be used. Test Certificates: Mill test certificates according to EN 10204 type 3.1 or 3.2 are typically supplied. Ultrasonic Testing: May be performed to class as per EN 10160 or other agreed standard. Notice: This data is based on the withdrawn DIN 17155 standard. For new designs, use EN 10028-2 13CrMo4-5 or equivalent. Values are for information and may vary with product form and actual manufacturing practice.
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