DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate: Properties, Equivalents & Applications
Detailed data sheet for 19Mn6 pressure vessel steel under DIN 17155. Includes chemical composition, mechanical and thermal properties, international equivalents, and guide to industrial usage.
Cutting, cold/hot forming, welding, machining, post-weld heat treatment
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DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Introduction
19Mn6 is a carbon-manganese steel grade designed for elevated temperature pressure vessels and boilers under the withdrawn German standard DIN 17155. It offers a well-balanced combination of high tensile strength, good weldability, and reliable notch toughness in the normalized condition. Typical applications include steam boilers, pressurized storage tanks, and process equipment operating up to approximately 400°C. The steel is produced as killed fine-grain material, usually with aluminium addition, ensuring uniform mechanical properties across thicknesses up to 150 mm. Its chemical composition is controlled to provide adequate creep resistance and long-term service stability. Although the standard has been superseded by EN 10028-2 P295GH, 19Mn6 remains widely recognized in maintenance and replacement projects. It can be readily formed, welded with low-hydrogen procedures, and post-weld heat treated when required. The data presented here are derived from the original DIN 17155 specification and typical physical reference values.
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Chemical Composition
The ladle analysis limits according to DIN 17155 for 19Mn6. The steel is fully killed and fine-grain treated, typically with a minimum total aluminium content of 0.020%. Residual elements are strictly controlled to ensure good weldability and elevated temperature properties.
| Element | Standard value (wt%) | Remarks |
|---|---|---|
| C | ≤0.20 | % |
| Si | ≤0.60 | % |
| Mn | 0.80 – 1.20 | % |
| P | ≤0.035 | % |
| S | ≤0.030 | % |
| Cr | ≤0.30 | % |
| Ni | ≤0.30 | % |
| Cu | ≤0.30 | % |
| Mo | ≤0.10 | % |
| Nb | ≤0.02 | % |
| Ti | ≤0.02 | % |
| V | ≤0.02 | % |
| Al (total) | ≥0.020 | % (fine-grain practice) |
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Physical Properties
The values listed are representative for carbon-manganese steel 19Mn6 at room temperature unless otherwise stated. They serve as engineering design data and are not mandatory in the material standard. Actual values may vary slightly with heat treatment and composition within the specified limits.
| Property | Typical value | Unit | Test condition / remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | at 20°C |
| Modulus of elasticity (E) | 210 × 10³ | MPa | at 20°C |
| Shear modulus (G) | 81 × 10³ | MPa | at 20°C |
| Poisson's ratio (ν) | 0.3 | – | at 20°C |
| Thermal expansion coefficient (α) | 11.5 × 10⁻⁶ | K⁻¹ | 20 – 100°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | at 20°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | at 20°C |
| Electrical resistivity (ρe) | approx. 0.20 | µΩ·m | at 20°C |
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Mechanical Properties
Tensile and impact properties in the normalized delivery condition as per DIN 17155. The specified values apply to transverse test pieces unless otherwise agreed. Impact energy is guaranteed for a minimum of 27 J at the specified test temperature, typically 0°C or -20°C depending on the order.
| Property | Standard requirement | Unit | Test condition / remarks |
|---|---|---|---|
| Yield strength (ReH) | ≥345 | MPa | Plate thickness ≤16 mm |
| Yield strength (ReH) | ≥335 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥325 | MPa | 40 < t ≤ 60 mm |
| Yield strength (ReH) | ≥315 | MPa | 60 < t ≤ 100 mm |
| Yield strength (ReH) | ≥295 | MPa | 100 < t ≤ 150 mm |
| Tensile strength (Rm) | 510 – 650 | MPa | t ≤ 60 mm |
| Tensile strength (Rm) | 490 – 630 | MPa | 60 < t ≤ 100 mm |
| Tensile strength (Rm) | 470 – 610 | MPa | 100 < t ≤ 150 mm |
| Elongation after fracture (A5) | ≥22 | % | t ≤ 40 mm, longitudinal |
| Elongation after fracture (A5) | ≥21 | % | 40 < t ≤ 60 mm, longitudinal |
| Elongation after fracture (A5) | ≥20 | % | 60 < t ≤ 100 mm, longitudinal |
| Elongation after fracture (A5) | ≥19 | % | 100 < t ≤ 150 mm, longitudinal |
| Impact energy (KV2) | ≥27 (average) | J | Transverse, at 0°C (typical requirement) |
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10028-2 | P295GH (1.0481) | Direct successor; identical chemistry and mechanical requirements. |
| International | ISO 9328-2 | P295GH | Technically equivalent to EN grade. |
| China | GB/T 713 | Q345R | Comparable carbon-manganese pressure vessel steel; minor differences in Mn and impact test requirements. |
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Application Introduction
19Mn6 (and its modern equivalent P295GH) is intended for welded pressure vessels and boilers operating at moderate temperatures. Its good formability and weldability allow fabrication of large-capacity vessels and complex components. Design stresses are typically taken from the corresponding EN or ASME code cases. Post-weld heat treatment is mandatory above certain thicknesses to relieve residual stresses. The steel is not recommended for sub-zero applications unless impact tested at the design temperature.
Product Applications: Steam drums and boiler shells, High-pressure storage tanks, Autoclaves and sterilizers, Heat exchanger shells, Distillation columns, Pressurized reactor vessels
Processed into products: Vessel cylindrical courses and formed heads, Nozzles and reinforcing pads, Flanges and tube sheets, Boiler end plates, Manhole covers and inspection openings, Structural supports for pressure equipment
Application industries: Oil & gas processing, Petrochemical and chemical plants, Power generation (fossil fuel and nuclear), Boiler manufacturing, LNG and cryogenic storage (with additional restrictions), Pharmaceutical and food processing equipment
DIN 17155 19Mn6 Pressure Vessel & Boiler Steel Plate Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A516/A516M | Grade 70 | Similar tensile strength range (485-620 MPa); requires evaluation of minimum yield and impact temperature. |
| USA | ASTM A537/A537M | Class 1 | Higher strength, carbon-manganese-silicon steel in normalized condition; may be considered for thicker sections. |
| Japan | JIS G3115 | SPV355 | Pressure vessel steel with comparable strength; verify thickness-dependent properties. |
| UK (former) | BS 1501 | 224-490A/B | Obsolete British standard grade; broadly equivalent to normalized carbon-manganese steel. |
Notes:
Welding: Use low-hydrogen processes (SMAW, SAW, GMAW) with matching filler metals (e.g., E7018 or AWS A5.17 EH12K). Preheat and interpass temperatures should be controlled to minimize hardening. Post-weld heat treatment: Typically performed at 600–640°C for stress relief; exact parameters depend on the vessel design code and thickness. Availability: Although DIN 17155 is withdrawn, steel suppliers may still offer 19Mn6-equivalent material according to EN 10028-2 P295GH with a 3.1 or 3.2 certificate. For repair or replacement of older equipment, it is essential to verify that the actual mechanical and chemical properties meet the original specification.
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