DIN 17155 19Mn6 Steel Coil for Gas Vessels
DIN 17155 19Mn6 Pressure Vessel Steel: Properties, Equivalents, and Welding Data
Detailed material data for 19Mn6 steel according to DIN 17155, including chemical composition, mechanical and physical properties, international equivalents, and application guidance for gas vessels and boilers.
Welding, hot forming, cold forming, machining, and normalizing heat treatment.
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DIN 17155 19Mn6 Steel Coil for Gas Vessels Introduction
19Mn6 is a German-standard carbon-manganese steel originally specified in DIN 17155 for pressure vessels and boilers. It is characterized by a minimum yield strength of 355 MPa (for thickness ≤16 mm) in the normalized condition, combined with good weldability and sufficient toughness at low temperatures.
- Typical applications include gas storage tanks, chemical reactor shells, and high-pressure piping.
- This grade is the direct predecessor of the harmonized European grade P355GH (EN 10028-2) and shares similar requirements with ASTM A516 Grade 70.
- Delivery is usually in the normalized condition, guaranteeing uniform grain refinement and predictable mechanical performance across welded joints.
DIN 17155 19Mn6 Steel Coil for Gas Vessels Chemical Composition to DIN 17155
The following table lists the chemical requirements for 19Mn6 steel. The alloy relies on manganese to provide strength and on aluminum for grain refinement. Phosphorus and sulfur are controlled at low levels to ensure ductility and weldability. Values are as per the ladle analysis.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.20 | For thickness ≤60 mm; ≤0.22 for thickness >60 mm |
| Silicon (Si) | 0.10 – 0.40 | |
| Manganese (Mn) | 1.00 – 1.60 | Higher end for thicker sections |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.030 | |
| Aluminum (Al) | ≥0.020 | Or other grain-refining element as agreed |
| Nitrogen (N) | ≤0.012 | If sufficient Al content is present |
DIN 17155 19Mn6 Steel Coil for Gas Vessels Physical and Thermal Properties
The data below represent average values for normalized 19Mn6 steel. Thermal conductivity and thermal expansion vary with temperature; multiple reference temperatures are given. Electrical resistivity is listed for completeness and is used in induction heating calculations.
| Property | Standard Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 81 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | — | 20°C |
| Thermal expansion coefficient (α) | 11.1 | 10⁻⁶/K | 20 – 100°C |
| Thermal expansion coefficient (α) | 12.1 | 10⁻⁶/K | 20 – 200°C |
| Thermal expansion coefficient (α) | 12.9 | 10⁻⁶/K | 20 – 300°C |
| Thermal expansion coefficient (α) | 13.5 | 10⁻⁶/K | 20 – 400°C |
| Thermal conductivity (λ) | 53 | W/(m·K) | 20°C |
| Thermal conductivity (λ) | 51 | W/(m·K) | 100°C |
| Thermal conductivity (λ) | 49 | W/(m·K) | 200°C |
| Thermal conductivity (λ) | 46 | W/(m·K) | 300°C |
| Specific heat capacity (cₚ) | 460 | J/(kg·K) | 20°C |
| Specific heat capacity (cₚ) | 500 | J/(kg·K) | 200°C |
| Specific heat capacity (cₚ) | 540 | J/(kg·K) | 400°C |
| Electrical resistivity (ρ_e) | 0.20 | μΩ·m | 20°C |
DIN 17155 19Mn6 Steel Coil for Gas Vessels Mechanical Properties at Room Temperature
The tensile and impact properties are specified for the normalized condition. Transverse specimens are normally used. Impact energy (KV) is determined on ISO-V specimens at -20°C. The bend test requires a 180° bend without cracking; the mandrel diameter depends on thickness.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield strength (ReH) | ≥355 | MPa | Thickness t ≤ 16 mm |
| Yield strength (ReH) | ≥345 | MPa | 16 mm < t ≤ 40 mm |
| Yield strength (ReH) | ≥335 | MPa | 40 mm < t ≤ 60 mm |
| Yield strength (ReH) | ≥315 | MPa | 60 mm < t ≤ 100 mm |
| Yield strength (ReH) | ≥295 | MPa | 100 mm < t ≤ 150 mm |
| Tensile strength (Rm) | 510 – 630 | MPa | t ≤ 60 mm |
| Tensile strength (Rm) | 490 – 630 | MPa | 60 mm < t ≤ 150 mm |
| Elongation (A5) | ≥21 | % | t ≤ 40 mm; L0=5.65√S0 |
| Elongation (A5) | ≥20 | % | 40 mm < t ≤ 150 mm |
| Impact energy (KV) | ≥27 | J | -20°C, transverse |
| Bend test (mandrel diameter) | 2a | — | t ≤ 60 mm, 180° |
| Bend test (mandrel diameter) | 3a | — | 60 mm < t ≤ 100 mm, 180° |
| Bend test (mandrel diameter) | 4a | — | 100 mm < t ≤ 150 mm, 180° |
DIN 17155 19Mn6 Steel Coil for Gas Vessels Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10028-2 | P355GH | Direct successor; identical chemical and mechanical requirements |
| International | ISO 9328-2 | P355GH | Harmonized with EN 10028-2 |
| Germany (superseded) | DIN 17155 | 19Mn6 | Original specification |
| Italy | UNI 5869 | Fe 510-2-KG | Comparable normalized grade |
| United Kingdom (superseded) | BS 1501-224 | 224-490 / 224-490B | Similar pressure vessel plate |
DIN 17155 19Mn6 Steel Coil for Gas Vessels Application Introduction
19Mn6 (and its current equivalent P355GH) is a mainstream material for welded pressure vessels and boilers operating at moderate temperatures. Thanks to its balanced composition, it can be formed and welded without special preheating in thinner gauges. The normalized microstructure provides consistent toughness and resistance to brittle fracture under static and low-cycle fatigue loading.
- Commonly used for vessels containing gases, steam, and pressurized liquids.
- Suitable for high-integrity components requiring 100% ultrasonic inspection and notch toughness testing at -20°C.
Product Applications: Stationary gas storage vessels (e.g., cylindrical and spherical tanks), Air receivers and compressed air storage tanks, Boiler drums and steam accumulators, Heat exchanger shells and channel sections, High-pressure piping and manifold headers, Distillation columns and reactor vessels
Processed into products: Cylindrical shell rings and domed heads (dished ends), Nozzle reinforcements and flanges, Tube plates (up to moderate thickness), Support skirts and saddles for vertical vessels, Reinforcing pads and lifting lugs, Welded stay plates and internal baffles
Application industries: Gas storage and transportation, Chemical and petrochemical processing, Power generation (boiler drums, steam headers), Hydrocarbon processing (LPG and LNG tanks), Water treatment (pressure filters), Shipbuilding (marine boilers)
DIN 17155 19Mn6 Steel Coil for Gas Vessels Close / Similar Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A516 / ASME SA-516 | Grade 70 | Similar strength (485-620 MPa) and -46°C impact option; Mn slightly lower |
| Japan | JIS G3115 | SPV355 | For pressure vessels; equivalent yield class, normalized |
| China | GB/T 713 | Q345R | Similar Mn-Si killed pressure vessel steel; check thickness ranges |
| Korea | KS D 3521 | SPV355 | Similar to JIS grade |
| European Union | EN 10028-3 | P355N | Fine-grain structural steel with similar strength, thinner sections |
Notes:
- For thicknesses above 150 mm, special agreement with the manufacturer is necessary; post-weld heat treatment (PWHT) is normally mandatory for thick-walled vessels.
- When operating at elevated temperatures (above ~400°C), the long-term creep properties of 19Mn6/P355GH must be considered – the design code usually reduces allowable stress.
- Welding consumables should match the base material: typical electrodes are E 42 5 B (ISO) or E7018-A1 (AWS) types for SMAW.
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