DIN 17102 WStE355 Hot Rolled Steel Coil
DIN 17102 WStE355 Hot Rolled Steel Coil - Weathering Fine-Grain Structural Steel Properties
Detailed material data for DIN 17102 WStE355 hot rolled steel coil, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Welding, flame cutting, cold forming, bending, punching, machining
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DIN 17102 WStE355 Hot Rolled Steel Coil Introduction
WStE355 is a weathering fine-grain structural steel defined in the German standard DIN 17102, typically supplied as hot rolled coil, plate, or strip. It belongs to the group of weldable fine-grain steels with enhanced atmospheric corrosion resistance, achieved by the addition of copper, chromium, and nickel. The "W" prefix indicates its weathering properties, allowing the material to develop a stable, protective rust layer when exposed to the atmosphere, thereby reducing the need for painting. This steel combines a minimum yield strength of 355 MPa with good toughness and weldability, making it suitable for heavy-duty structural applications in outdoor environments. The fine-grain structure is attained by microalloying elements and controlled rolling, ensuring consistent through-thickness properties and excellent formability.
- Good atmospheric corrosion resistance
- High strength with excellent toughness at low temperatures
- Weldable using standard procedures
- Available in normalized or thermo-mechanically rolled conditions
DIN 17102 WStE355 Hot Rolled Steel Coil Chemical Composition
Chemical composition according to DIN 17102 for WStE355. Weathering elements Cu, Cr, and Ni are mandatory to ensure atmospheric corrosion resistance. Microalloying elements such as Nb, V, or Ti may be added for grain refinement and strength. Values are ladle analysis limits.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon, C | ≤0.12 | Maximum |
| Silicon, Si | ≤0.50 | Maximum |
| Manganese, Mn | 1.00 – 1.50 | Range |
| Phosphorus, P | ≤0.035 | Maximum |
| Sulfur, S | ≤0.035 | Maximum |
| Aluminium, Al (total) | ≥0.020 | Minimum, for grain refinement |
| Copper, Cu | 0.25 – 0.55 | Weathering element |
| Chromium, Cr | 0.30 – 0.80 | Weathering element |
| Nickel, Ni | ≤0.65 | Weathering element |
| Niobium, Nb | ≤0.05 | Optional grain refiner |
| Vanadium, V | ≤0.12 | Optional grain refiner |
| Titanium, Ti | ≤0.05 | Optional grain refiner |
| Nitrogen, N | ≤0.012 | Maximum for fine-grain quality |
DIN 17102 WStE355 Hot Rolled Steel Coil Thermal and Electrical Physical Properties
Typical physical properties for WStE355 at room temperature unless otherwise stated. These values are representative for low-alloy steel and may vary slightly depending on exact composition and heat treatment. Density, thermal conductivity, and electrical resistivity are influenced by alloying content.
| Property | Standard Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density, ρ | 7.85 | g/cm³ | Room temperature |
| Modulus of elasticity, E | 210 | GPa | Room temperature, static |
| Shear modulus, G | 81 | GPa | Room temperature, calculated from E and ν |
| Poisson's ratio, ν | 0.3 | – | Room temperature, within elastic range |
| Thermal expansion coefficient, α | 12 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal conductivity, λ | 50 | W/(m·K) | Room temperature |
| Specific heat capacity, cp | 460 | J/(kg·K) | Room temperature |
| Electrical resistivity, ρe | 0.25 × 10⁻⁶ | Ω·m | Room temperature |
DIN 17102 WStE355 Hot Rolled Steel Coil Mechanical Properties
Tensile properties and impact energy for WStE355 as specified in DIN 17102. Values are for longitudinal test pieces in the as-delivered condition (thermo-mechanically rolled or normalized). Impact energy is determined on Charpy-V specimens. Bending test with a mandrel diameter related to specimen thickness (a).
| Property | Standard Requirement | Unit | Test Condition (thickness & direction) |
|---|---|---|---|
| Yield strength, ReH (min.) | 355 | MPa | t ≤ 16 mm, longitudinal |
| Yield strength, ReH (min.) | 345 | MPa | 16 mm < t ≤ 40 mm, longitudinal |
| Yield strength, ReH (min.) | 335 | MPa | 40 mm < t ≤ 63 mm, longitudinal |
| Tensile strength, Rm | 490 – 630 | MPa | t ≤ 63 mm, longitudinal |
| Elongation after fracture, A (min.) | 22 | % | t ≤ 40 mm, longitudinal (gauge length 5.65√S0) |
| Elongation after fracture, A (min.) | 21 | % | 40 mm < t ≤ 63 mm |
| Impact energy, KV (min.) | 27 | J | -20 °C, longitudinal Charpy-V |
| Bending test (mandrel diameter) | d = 2a | – | t ≤ 16 mm, 180° bend |
| Bending test (mandrel diameter) | d = 3a | – | 16 mm < t ≤ 40 mm, 180° bend |
DIN 17102 WStE355 Hot Rolled Steel Coil Completely Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10155 | S355J2WP | Direct equivalent; withdrawn standard, superseded by EN 10025-5 |
| Europe | EN 10025-5 | S355J2W+N / S355J2W+M | Current European standard for weathering steels; +N or +M delivery condition |
| Germany | DIN 17102 | WStE355 | Original standard grade |
DIN 17102 WStE355 Hot Rolled Steel Coil Application Introduction
WStE355 weathering steel is primarily chosen for structural applications where long-term corrosion resistance without painting is desired, leading to reduced maintenance costs. It is suitable for welded, bolted, or riveted constructions in outdoor exposure. The steel's strength allows for weight savings in design. Proper detailing must ensure free drainage and avoid crevices to permit the protective patina to form effectively.
Product Applications: Bridge girders, diaphragms, and stiffeners, Welded steel frameworks for industrial buildings, Unpainted weathering steel facades, Cargo containers and tank containers, Transmission line poles and towers, Railway passenger car underframes
Processed into products: Main beams and crossbeams for bridges, Deck plates and orthotropic bridge decks, Container corrugated walls and corner posts, Tower legs and bracing members, Rolling stock bogie frames, Weldments for heavy machinery exposed to weather
Application industries: Civil engineering and bridge construction, Railway rolling stock and infrastructure, Container and shipbuilding, Power transmission towers, Architectural structures and cladding, Mining and earthmoving equipment
DIN 17102 WStE355 Hot Rolled Steel Coil Similar/Comparable Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A588 / A588M | Grade A | Similar weathering steel, min. yield 345 MPa; slightly different alloying concept |
| USA | ASTM A709 / A709M | Grade 50W | Structural weathering steel for bridges, 50 ksi yield |
| China | GB/T 4171 | Q355NH / Q355NHL | Weathering structural steel, min. yield 355 MPa; similar performance |
| Japan | JIS G3125 | SPA-H | High weathering rolled steel for welded structures; thickness capability differs |
| Russia | GOST R 52927 | 09G2D | Used for similar weather-resistant structural applications |
Notes:
Welding considerations: WStE355 can be welded using all common methods. Due to its weathering alloying content, welding consumables should match the base metal's corrosion resistance (e.g., Mn-Ni-Cu alloyed electrodes). Preheating is typically not required for moderate thicknesses. Patina formation: A dense, adherent oxide layer develops upon cyclic wetting and drying. During the initial exposure, runoff water may contain iron oxides and can stain adjacent surfaces; protective measures should be taken. Availability: Thicknesses above 63 mm may require specific agreement for compliance with DIN 17102.
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