QStE500N Steel (SEW 092) High-Strength Hot-Rolled Strip
QStE500N Automotive Structure Steel Plate - SEW092 | High-Strength Microalloyed Steel
Detailed material data for QStE500N hot-rolled microalloyed steel according to SEW092. Includes chemical composition, mechanical properties, thermal and electrical physical properties, equivalent grades, and application guidance for automotive structural components.
Cold forming, bending, punching, shearing, welding
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QStE500N Steel High-Strength Hot-Rolled Strip Introduction
QStE500N is a hot-rolled, high-strength microalloyed steel for cold forming, specified in the German standard SEW 092 (now superseded by EN 10149-2). It belongs to the family of fine-grain structural steels with minimum yield strength of 500 MPa. The N designation indicates a normalized or normalizing-rolled delivery condition. This steel exhibits excellent weldability, good cold formability, and high toughness even at low temperatures. The low carbon equivalent (CEV) ensures reliable welding without preheating. Typical applications include load-bearing automotive components such as chassis frames, longitudinal beams, and suspension arms, where weight reduction and high strength are critical. QStE500N is supplied as hot-rolled coils, plates, or strips, and can be processed by bending, punching, and welding.
QStE500N Steel High-Strength Hot-Rolled Strip Chemical Composition
Ladle analysis according to SEW092 for grade QStE500N. Values are maximum unless a range is specified. Microalloying elements such as Nb, V, and Ti are used for grain refinement and precipitation strengthening.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C (Carbon) | ≤ 0.12 | Ladle analysis |
| Si (Silicon) | ≤ 0.50 | Ladle analysis |
| Mn (Manganese) | ≤ 1.70 | Ladle analysis |
| P (Phosphorus) | ≤ 0.025 | Ladle analysis |
| S (Sulfur) | ≤ 0.015 | Ladle analysis |
| Al (Aluminium, total) | ≥ 0.015 | Ladle analysis |
| Nb (Niobium) | ≤ 0.09 | Ladle analysis |
| V (Vanadium) | ≤ 0.20 | Ladle analysis |
| Ti (Titanium) | ≤ 0.15 | Ladle analysis |
| N (Nitrogen) | ≤ 0.020 | Optional, typical limitation |
| Mo (Molybdenum) | ≤ 0.50 | Optional, may be present |
| B (Boron) | ≤ 0.005 | Optional, may be present |
QStE500N Steel High-Strength Hot-Rolled Strip Thermal and Electrical Physical Properties
Typical physical properties for QStE500N at ambient temperature and for general engineering calculations. These values are indicative and may vary slightly with actual composition and processing conditions.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of elasticity (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | ≈ 80 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | – | 20 °C |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | 20 – 100 °C |
| Thermal expansion coefficient (α) | 12.5 | 10⁻⁶/K | 20 – 200 °C |
| Thermal expansion coefficient (α) | 13.0 | 10⁻⁶/K | 20 – 300 °C |
| Thermal conductivity (λ) | 48 – 52 | W/(m·K) | 20 °C |
| Specific heat capacity (c) | 460 – 480 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρ_e) | 0.25 – 0.30 | μΩ·m | 20 °C |
QStE500N Steel High-Strength Hot-Rolled Strip Mechanical Properties
Minimum mechanical properties for QStE500N at room temperature in the delivery condition (+N). Values depend on product thickness and test direction. Longitudinal test pieces are used unless otherwise stated. Impact energy is determined on Charpy V-notch specimens.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 500 | MPa | Thickness ≤ 16 mm |
| Yield strength (ReH) | ≥ 480 | MPa | Thickness > 16 mm ≤ 40 mm |
| Tensile strength (Rm) | 550 – 700 | MPa | Thickness ≤ 16 mm |
| Tensile strength (Rm) | 540 – 700 | MPa | Thickness > 16 mm ≤ 40 mm |
| Elongation (A80) | ≥ 14 | % | Thickness < 3 mm, gauge length 80 mm |
| Elongation (A5) | ≥ 18 | % | Thickness ≥ 3 mm, gauge length 5.65√So |
| Bend test (180°) | Mandrel diameter = 1t | – | Thickness ≤ 8 mm, t = specimen thickness |
| Bend test (180°) | Mandrel diameter = 2t | – | Thickness > 8 mm ≤ 16 mm |
| Impact energy (KV₂) | ≥ 27 | J | Longitudinal, -20 °C |
| Impact energy (KV₂) | ≥ 27 | J | Longitudinal, -40 °C (optional agreement) |
QStE500N Steel High-Strength Hot-Rolled Strip Fully Equivalent Material Standards and Substitute Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S500MC | Direct replacement, normalized or normalizing rolled |
| International | ISO 6930-2 | S500MC | Identical to EN S500MC |
| Germany | DIN EN 10149-2 | S500MC | DIN adoption of EN standard |
| Italy | UNI EN 10149-2 | S500MC | UNI adoption of EN |
| France | NF EN 10149-2 | S500MC | AFNOR adoption of EN |
| UK | BS EN 10149-2 | S500MC | BSI adoption of EN |
| Japan | JIS G 3134 | SPFC 590Y | Close but not fully equivalent; check yield strength and impact properties |
QStE500N Steel High-Strength Hot-Rolled Strip Application Introduction
QStE500N is specifically designed for automotive structural components that require high strength, good fatigue resistance, and excellent cold formability. Its low alloy content and fine grain size ensure reliable welded joints without preheating. Typical processing methods include laser cutting, blanking, bending, roll forming, and robotic welding. The steel can be galvanized or coated for corrosion protection.
Product Applications: Passenger car chassis and subframes, Truck frame rails and cross members, Trailer longitudinal beams and drawbars, Seat frames and backrest structures, Suspension control arms and spring brackets, Engine cradles and mounting brackets, Lightweight structural tubes and profiles
Processed into products: Longitudinal chassis beams, Transverse cross members, Control arms (upper and lower), Axle mounting brackets, Bumper reinforcements, Door impact beams, Roof bows and pillar reinforcements, Suspension coil spring pans, Towing hitch components
Application industries: Automotive manufacturing, Commercial vehicle and trailer industry, Agricultural and construction machinery, Railway vehicle structures, Furniture and storage systems
QStE500N Steel High-Strength Hot-Rolled Strip Similar or Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S550MC | Higher strength grade (ReH ≥ 550 MPa), similar formability and weldability, may require slightly larger bending radii. |
| Germany | SEW 092 | QStE500TM | Thermomechanically rolled variant (+M delivery), equivalent strength but different processing route; can replace QStE500N if impact requirements are met. |
| USA | ASTM A1011 / A1011M | HSLAS Grade 80 (550) | High-strength low-alloy steel with minimum yield strength 550 MPa; chemical composition differs, but performance is comparable. Check for cold formability. |
| USA | ASTM A656 / A656M | Grade 80 | High-strength low-alloy structural steel, similar strength level, typically used in automotive and structural applications. |
| China | GB/T 20887.1 | HR500MC | Chinese standard for high-strength hot-rolled cold-forming steel, equivalent to S500MC. |
Notes:
- The data provided are based on SEW 092 and typical EN 10149-2 values. For final design, consult the actual material certificate and the latest standard edition.
- Cold forming properties (e.g., minimum bending radius) depend on the edge condition and forming direction relative to rolling direction.
- Impact properties at low temperatures (-40 °C and below) are available upon agreement between supplier and buyer.
- Weldability: CEV typically ≤ 0.35%, making it suitable for all common welding methods (MAG, resistance spot welding, laser welding) without preheating.
- Surface condition: as-rolled, pickled and oiled, or coated (by agreement).
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