DIN 17102 TStE285 Automobile Structure Steel Plate
DIN 17102 TStE285 Automobile Structure Steel Plate: Technical Data & Properties
Detailed material analysis of DIN 17102 TStE285 automobile structure steel plate, including chemical composition, mechanical properties, thermal properties, international equivalents, and application guide.
Hot rolling, normalizing, welding, cold forming, cutting, machining
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DIN 17102 TStE285 Automobile Structure Steel Plate Introduction
DIN 17102 TStE285 is a weldable normalized fine-grain structural steel plate specifically designed for automobile structures. It is produced according to the German standard DIN 17102, which covers technical delivery conditions for hot-rolled products of suitable weldable fine grain steels. The steel grade TStE285 exhibits a minimum yield strength of 285 MPa and is characterized by good weldability, excellent toughness at low temperatures, and suitability for cold forming. The fine-grain nature, achieved by aluminum and micro-alloying elements (Nb, V), ensures uniform mechanical properties and high resistance to brittle fracture. Typical applications include load-bearing members in vehicle chassis, crane booms, and other structural components subject to dynamic loading and low ambient temperatures.
DIN 17102 TStE285 Automobile Structure Steel Plate Chemical Composition
The chemical composition of TStE285 is tightly controlled to ensure weldability and fine-grain microstructure. Key elements include manganese for strength, aluminum for grain refinement, and micro-alloying elements like niobium and vanadium to enhance strength and toughness. Phosphorus and sulfur are kept low for toughness and weldability.
| Element | Standard Value (max. % unless specified) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.18 | |
| Silicon (Si) | ≤0.50 | |
| Manganese (Mn) | 0.90 – 1.65 | |
| Phosphorus (P) | ≤0.030 | |
| Sulfur (S) | ≤0.025 | |
| Aluminum total (Al) | ≥0.020 | Grain-refining element |
| Niobium (Nb) | ≤0.05 | |
| Vanadium (V) | ≤0.10 | |
| Titanium (Ti) | ≤0.06 | |
| Nitrogen (N) | ≤0.015 |
DIN 17102 TStE285 Automobile Structure Steel Plate Thermal & Electrical Physical Properties
Typical physical properties for low-carbon structural steel at room temperature. These values are for general engineering reference and may vary slightly depending on exact composition and processing.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 81 | GPa | 20°C |
| Poisson's ratio (ν) | 0.3 | - | 20°C |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | 20 – 100°C |
| Thermal conductivity (λ) | 53 | W/(m·K) | 20°C |
| Specific heat capacity | 465 | J/(kg·K) | 20°C |
| Electrical resistivity (ρ_e) | 0.25 | Ω·mm²/m | 20°C |
DIN 17102 TStE285 Automobile Structure Steel Plate Mechanical Properties
Mechanical properties are guaranteed for the normalized delivery condition. The values vary with product thickness. The steel offers high yield and tensile strength combined with good ductility and low-temperature notch toughness. Impact energy is specified at -20°C for the TStE285 grade (T for toughness), ensuring safe application in cold climates.
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | ≥285 | MPa | t ≤16 mm |
| Yield strength (ReH) | ≥255 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥235 | MPa | 40 < t ≤ 63 mm |
| Tensile strength (Rm) | 410 – 540 | MPa | t ≤ 100 mm |
| Elongation (A) | ≥22 | % | t ≤16 mm, L0=5.65√S0 |
| Elongation (A) | ≥21 | % | 16 < t ≤ 40 mm |
| Elongation (A) | ≥20 | % | 40 < t ≤ 63 mm |
| Charpy impact energy (KV) | ≥27 | J | Longitudinal, -20°C, t ≤60 mm |
| Bend test (mandrel diameter) | 2t (t ≤16mm) | - | 180° bend, a = bend angle |
DIN 17102 TStE285 Automobile Structure Steel Plate Full Equivalent Standards and Replacement Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-3 | S275N | Normalized fine grain steel, same strength class, impact energy at -20°C |
| European Union | EN 10025-3 | S275NL | Normalized fine grain steel, impact energy at -50°C, can replace TStE285 if lower temperature toughness required |
DIN 17102 TStE285 Automobile Structure Steel Plate Application Introduction
DIN 17102 TStE285 is engineered for welded load-bearing structures, especially in the automotive and heavy engineering sectors where low-temperature toughness and reliability are critical. Its fine-grain microstructure and normalized delivery condition ensure consistent mechanical properties and good resistance to brittle fracture. The steel is well-suited for cold forming operations like bending and folding, and is readily weldable with conventional methods.
Product Applications: Commercial vehicle chassis and frames, Trailer beams and drawbars, Mobile crane telescopic booms, Heavy-duty lifting forks and arms, Structural parts for agricultural machinery
Processed into products: Chassis rails, Cross members, Strengthening plates, Bent and welded box sections, Booms and sections, Base frames of heavy equipment
Application industries: Automotive (truck frames, trailers, chassis), Construction & earthmoving machinery (excavator booms, loader arms), Crane & lifting equipment (mobile crane booms, outriggers), Bridge structures (secondary members, stiffeners), Offshore and shipbuilding (deck components, modest temperature exposure)
DIN 17102 TStE285 Automobile Structure Steel Plate Materials with Similar Properties
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S275JR | Not fine grain; lower toughness (27J at +20°C); may be used for less demanding structures |
| European Union | EN 10025-2 | S275J0 | Better toughness than JR; impact energy 27J at 0°C; non-normalized |
| European Union | EN 10025-2 | S275J2 | Good toughness 27J at -20°C; similar to TStE285 in impact but not fine grain; may need normalizing for strength consistency |
| Germany | DIN 17100 | St44-3 | Obsolete standard; comparable strength but not guaranteed fine grain; replaced by EN grades |
Notes:
Welding: TStE285 has good weldability due to low carbon equivalent (CEV typically ≤0.40). No preheating is generally required for thickness up to 30 mm. Use filler metals matching. Cold forming: Suitable for bending and flanging with a minimum bending radius of 1t to 2t for thickness ≤16mm. Surface condition: Usually supplied as hot-rolled normalized with mill scale; shot blasting and priming available on request.
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