DIN 17155 HII Steel Plate
DIN 17155 HII Steel Plate - Boiler & Pressure Vessel Grade (P265GH Equivalent)
Comprehensive data sheet for DIN 17155 HII steel plate: chemical composition, mechanical and thermal properties, international equivalents, and application guide for welded boilers and pressure vessels.
Hot rolling, normalizing, welding, bending, flanging
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DIN 17155 HII Steel Plate Introduction
DIN 17155 HII is a German standard carbon steel plate specifically designed for welded pressure vessels and boilers in elevated-temperature service. It offers good weldability, reliable strength, and satisfactory toughness at moderate temperatures.
- Normalized delivery condition ensures fine grain structure and uniform properties.
- Suitable for components operating up to approximately 400 °C.
- Now largely superseded by EN 10028-2 P265GH, but still widely specified in maintenance and replacement projects.
Typical applications include boiler drums, steam vessels, heat exchangers, and pressure tanks in power generation, chemical, and petrochemical industries.
DIN 17155 HII Steel Plate Chemical Composition
The composition of DIN 17155 HII is controlled to ensure good weldability and high-temperature strength. Maximum limits for impurities and residual elements guarantee resistance to embrittlement and aging.
- Low carbon content provides excellent welding characteristics without preheating for moderate thicknesses.
- Manganese contributes to strength and toughness.
- Strict control of phosphorus and sulfur ensures cleanliness and good ductility.
| Element | Value (%) | Remarks |
|---|---|---|
| Carbon, C | ≤ 0.20 | |
| Silicon, Si | ≤ 0.35 | |
| Manganese, Mn | 0.50 – 1.30 | |
| Phosphorus, P | ≤ 0.035 | |
| Sulfur, S | ≤ 0.030 | |
| Chromium, Cr | ≤ 0.30 | residual |
| Nickel, Ni | ≤ 0.30 | residual |
| Molybdenum, Mo | ≤ 0.08 | residual |
| Copper, Cu | ≤ 0.30 | residual |
| Other elements (total) | ≤ 0.70 | residuals |
DIN 17155 HII Steel Plate Thermal & Electrical Physical Properties
Physical properties of DIN 17155 HII are consistent with those of low‑carbon structural steels. These values are used for design calculations involving heat transfer, thermal expansion, and electrical conductivity.
- Density is nearly constant across the composition range.
- Elastic and shear moduli decrease slightly with temperature; the room‑temperature values are provided.
- Thermal conductivity and expansion are crucial for welded fabrication and thermal cycling.
| Property | Typical Value | Unit | Conditions / Reference |
|---|---|---|---|
| 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 |
| Poisson's ratio, ν | 0.30 | at 20 °C | |
| Thermal expansion coefficient, α | 11.5 – 12.5 | 10⁻⁶/K | 20 – 100 °C |
| Thermal conductivity, λ | 50 – 55 | W/(m·K) | at 20 °C |
| Specific heat capacity, cp | 460 | J/(kg·K) | at 20 °C |
| Electrical resistivity, ρₑ | 0.22 – 0.25 | µΩ·m | at 20 °C |
DIN 17155 HII Steel Plate Mechanical Properties
Mechanical properties of DIN 17155 HII are guaranteed in the normalized condition. The yield strength decreases with increasing thickness.
- Minimum impact energy at 0 °C is 34 J (longitudinal) unless otherwise specified.
- Bend test uses a mandrel diameter of 2 t (t = plate thickness) up to 20 mm, and 3 t for thicknesses over 20 mm; no cracks shall occur.
- Elongation is measured on a proportional test piece (l₀ = 5.65√S₀).
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength, ReH | ≥ 265 | MPa | thickness ≤ 16 mm |
| Yield strength, ReH | ≥ 255 | MPa | 16 mm < thickness ≤ 40 mm |
| Yield strength, ReH | ≥ 240 | MPa | 40 mm < thickness ≤ 60 mm |
| Tensile strength, Rm | 410 – 530 | MPa | thickness ≤ 60 mm |
| Elongation, A (l₀ = 5.65√S₀) | ≥ 22 | % | thickness ≤ 60 mm |
| Impact energy, KV (longitudinal) | ≥ 34 | J | at 0 °C |
| Bend test (mandrel diameter) | 2t | thickness ≤ 20 mm | |
| Bend test (mandrel diameter) | 3t | thickness > 20 mm |
DIN 17155 HII Steel Plate Completely Equivalent Material Standards & Substitute Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10028-2 | P265GH | Direct successor; current European specification |
| International | ISO 9328-2 | P265GH | Identical to EN P265GH |
| United Kingdom | BS 1501-224 | 490B | Former British equivalent for boiler plates |
| Italy | UNI 5869 | Fe 410-2KW | Italian pressure vessel plate grade |
| France | NF A36-205 | P265GH | French adoption of European standard |
DIN 17155 HII Steel Plate Application Introduction
DIN 17155 HII is employed where reliable performance under pressure and moderate temperatures is required. It can be hot‑ and cold‑formed, welded by common methods, and machined after normalizing.
- Not recommended for sour service (H₂S) without additional testing.
- Stress relieving after welding is often required for thick sections per relevant codes.
Product Applications: Steam boiler drums, Shell and tube heat exchangers, Pressure vessel shells and heads, Hot water storage tanks, Autoclaves and sterilizers, Deaerators and blow‑off tanks
Processed into products: Cylindrical shells and courses, Ellipsoidal and torispherical heads, Nozzle forgings and reinforcements, Flanges (welding neck, slip‑on), Baffle plates and tube sheets, Support skirts and lugs, Manway covers and blind flanges
Application industries: Power generation (fossil fuel and nuclear plants), Chemical and petrochemical processing, Oil and gas (downstream), Pharmaceutical industry, Pulp and paper (digesters and recovery boilers)
DIN 17155 HII Steel Plate Similar / Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A516 / A516M | Grade 60 | Similar tensile range; yield strength slightly lower (≥220 MPa); impact properties at specified temperature |
| USA | ASTM A516 / A516M | Grade 65 | Higher strength (Rm 450–585 MPa); suitable for thicker sections |
| Japan | JIS G3103 | SB450 | Boiler steel with comparable tensile properties (Rm 450–600 MPa) |
| China | GB/T 713 | Q245R | Similar carbon‑steel boiler plate; yield ≥245 MPa, tensile 400–520 MPa |
| Russia | GOST 5520 | 20K | Widely used boiler plate; comparable carbon‑manganese composition |
Notes:
- DIN 17155 was withdrawn and is now superseded by EN 10028‑2; however, HII remains a common designation in revision projects.
- Plates are normally delivered with ultrasonic testing (UT) according to EN 10160 or equivalent, if specified.
- Welding consumables should match the base metal (e.g., E7018 for SMAW, ER70S‑6 for GMAW).
- Post‑weld heat treatment (PWHT) is mandatory for thicknesses exceeding 35 mm in many pressure vessel codes.
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