DIN 17102 EStE380 Hot Rolled Steel Coil
DIN 17102 EStE380 Hot Rolled Steel Coil: High-Strength Fine-Grain Structural Steel
Explore the material data of DIN 17102 EStE380 hot rolled steel coil, a weldable fine-grain structural steel with minimum yield strength 380 MPa, ideal for cold forming and structural applications.
Cold forming, bending, welding, machining, hot-dip galvanizing
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DIN 17102 EStE380 Hot Rolled Steel Coil Introduction
DIN 17102 EStE380 (also designated StE380) is a hot-rolled, weldable fine-grain structural steel supplied in coil form. It offers a minimum yield strength of 380 MPa in thicknesses up to 16 mm and belongs to the family of normalized or thermomechanically rolled steels. The fine-grain microstructure is achieved through microalloying elements such as niobium, vanadium, or titanium, providing a balanced combination of strength, toughness, and weldability.
- Excellent cold formability compared to conventional structural steels of similar strength.
- Guaranteed impact energy at low temperatures (quality-dependent).
- Uniform mechanical properties across the coil due to controlled rolling practices.
Typical applications include welded structures, frames, automotive components, and machine parts where weight reduction and high load-carrying capacity are required.
DIN 17102 EStE380 Hot Rolled Steel Coil Chemical Composition
The chemical composition is based on DIN 17102 for StE380. Microalloying elements (Nb, V, Ti) are added singularly or in combination to achieve fine-grain refinement. The steel is fully killed and aluminum is used as a deoxidizer. Note: Depending on the quality grade (e.g., basic, N, V), slight variations in P and S limits or additional impact requirements may apply.
| Element | Standard Value | Remarks |
|---|---|---|
| C (Carbon) | ≤0.20 | Max. carbon content for weldability |
| Si (Silicon) | ≤0.50 | Improves strength and deoxidation |
| Mn (Manganese) | 0.90–1.65 | Contributes to strength and toughness |
| P (Phosphorus) | ≤0.035 | For quality grade N; ≤0.020 for grade V |
| S (Sulfur) | ≤0.035 | For quality grade N; ≤0.015 for grade V |
| Al (Aluminum) | ≥0.015 (total) | Grain refinement by AlN precipitates |
| Nb (Niobium) | ≤0.09 | Optional microalloy for grain refinement |
| V (Vanadium) | ≤0.12 | Optional microalloy for precipitation strengthening |
| Ti (Titanium) | ≤0.22 | Optional microalloy for grain refinement and carbide formation |
DIN 17102 EStE380 Hot Rolled Steel Coil Thermal and Electrical Physical Properties
These physical properties are typical for fine-grain structural steels at ambient temperature and are provided for engineering calculations. Note: Thermal expansion coefficient and thermal conductivity are temperature-dependent; the values given are average for the range 20–100°C. Density and elastic moduli are based on standard steel data.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Elastic Modulus (E) | 210 | GPa | 20°C, static |
| Shear Modulus (G) | 81 | GPa | 20°C, calculated |
| Poisson's Ratio (ν) | 0.3 | — | Elastic range |
| Thermal Expansion Coefficient (α) | 12.0×10⁻⁶ | 1/K | 20–100°C |
| Thermal Conductivity (λ) | 48 | W/(m·K) | 20°C |
| Specific Heat Capacity (cₚ) | 480 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.20 | Ω·mm²/m | 20°C |
DIN 17102 EStE380 Hot Rolled Steel Coil Mechanical Properties
Mechanical properties are specified according to DIN 17102 for the hot-rolled condition. Values depend on product thickness. The material is characterized by high yield and tensile strength with good elongation. Impact energy applies to quality grades with specified testing temperature (e.g., 27 J at -20°C for grade N). Bend test: Mandrel diameter is a function of thickness and bend angle (180° typically).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥380 | MPa | Thickness ≤16 mm, transverse specimen |
| Tensile Strength (Rm) | 450–590 | MPa | Thickness ≤16 mm |
| Elongation (A50) | ≥18 | % | Thickness ≤16 mm, gauge length 50 mm (proportional) |
| Yield Strength (ReH) | ≥370 | MPa | Thickness 16–25 mm |
| Tensile Strength (Rm) | 440–580 | MPa | Thickness 16–25 mm |
| Elongation (A50) | ≥17 | % | Thickness 16–25 mm |
| Impact Energy (KV) – Grade N | ≥27 | J | -20°C, longitudinal Charpy-V |
| Impact Energy (KV) – Grade V | ≥31 | J | -50°C, longitudinal Charpy-V (if agreed) |
| Bend Test (Mandrel Diameter) | 1.5 t (t ≤10 mm) | — | 180° bend, t = specimen thickness |
DIN 17102 EStE380 Hot Rolled Steel Coil Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S380MC | Thermomechanically rolled cold-forming steel, identical strength class |
| Germany (superseded) | DIN 17102 | QStE380TM | If thermomechanical rolling is specified |
| Japan | JIS G 3135 | SPFC 380 | High-strength cold-rolled steel; similar strength, but different production route |
| USA | ASTM A1011 | Grade 55 (380) | Structural steel, minimum yield 55 ksi (380 MPa); chemistry may differ |
DIN 17102 EStE380 Hot Rolled Steel Coil Application Introduction
EStE380 hot rolled coil is designed for structural applications where high static and dynamic loads are encountered, yet good formability and weldability are essential. It is a cost-effective choice for cold-formed profiles and welded assemblies. The material can be supplied with improved atmospheric corrosion resistance if copper is added as agreed (not standard). Typical use cases include:
Product Applications: Hot rolled coils and cut-to-length sheets, Cold-formed open sections (C, Z, U profiles), Welded square and rectangular hollow sections, Stamped and bent sheet metal parts, Laser-cut blanks for fabrication
Processed into products: Structural beams and columns, Automotive longitudinal beams and cross members, Boom segments for mobile cranes, Flanges and gusset plates, Mounting brackets and supports, Gear box housings (medium load)
Application industries: Automotive (truck frames, chassis components, wheel rims), Construction (steel frameworks, purlins, piles), Agricultural machinery (ploughs, harrows, trailers), Material handling (crane booms, fork-lift profiles), Pressure vessel manufacturing (with proper quality certification), Offshore and shipbuilding (deck structures, stiffeners)
DIN 17102 EStE380 Hot Rolled Steel Coil Similar/Alternative Materials for Substitution
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S355N/NL | Normalized fine-grain structural steel; lower strength (355 MPa) but better low-temperature toughness |
| Europe | EN 10149-2 | S420MC | Higher strength grade (420 MPa) in the same series; for weight reduction |
| Germany | DIN 17102 | StE355 | Predecessor grade with slightly lower strength (355 MPa); interchangeable if design allows |
| International | ISO 4950-2 | HSLA380 | High-strength low-alloy steel with 380 MPa yield; similar weldability and formability |
Notes:
Delivery conditions may be tailored: The material can be ordered as-rolled, normalized (N), or thermomechanically rolled (TM) to meet specific impact toughness requirements. When ordering, the desired quality grade (e.g., N, V) and testing specification (e.g., EN 10204 inspection certificate type) should be clarified. Heat treatment for stress relief after welding is not generally required due to the steel's low carbon equivalent. For deep drawing applications, consult the supplier for special surface quality and edge conditions.
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