EN 10083-3 4135/4140/4142/6150 Alloy Structural Steel Plate Material Overview & Core Advantages
EN 10083-3 defines chromium-molybdenum-vanadium alloy steel plates with 900-1300 MPa tensile strength, optimized for critical power transmission components. The 42CrMo4 grade achieves 62 HRC surface hardness after oil quenching while maintaining 14% elongation for forged crankshafts.
Key Differentiators:
- Hardenability Depth: Jominy test 14mm (50CrMo4) vs 8mm in AISI 4140.
- Global Equivalency: ASTM A829 4140 (42CrMo4), JIS G4053 SCM440 (51CrV4).
- Fatigue Resistance: 650 MPa endurance limit @ 10⁷ cycles (34CrMo4).
Technical Specifications
1. Chemical Composition (EN 10083-3:2023 Update)
| Grade | C Range | Cr Range | Mo Range | V Range | CEV* |
|---|---|---|---|---|---|
| 34CrMo4 | 0.30-0.37% | 0.90-1.20% | 0.15-0.30% | – | 0.68 |
| 42CrMo4 | 0.38-0.45% | 0.90-1.20% | 0.15-0.30% | – | 0.75 |
| 51CrV4 | 0.47-0.55% | 0.90-1.20% | – | 0.10-0.25% | 0.82 |
*CEV = C + Mn/6 + (Cr + Mo + V)/5
2. Mechanical Properties by Thickness
| Thickness | Yield (MPa) | Tensile (MPa) | Impact (-40°C) | Surface Hardness |
|---|---|---|---|---|
| 8-20mm | ≥750 | 1000-1200 | 45 J | 58-62 HRC |
| 60-100mm | ≥550 | 800-950 | 35 J | 52-56 HRC |
| 100-160mm | ≥500 | 750-900 | 35 J | 48-52 HRC |
Physical Properties:
- Thermal Conductivity: 42.5 W/m·K (20-400°C)
- Linear Expansion: 12.3 µm/m°C (25-300°C)
Heat Treatment & Processing
1. Quenching Parameters
| Grade | Temperature | Cooling Medium | Hardness Achieved |
|---|---|---|---|
| 42CrMo4 | 850-880°C | Oil | 58-63 HRC |
| 51CrV4 | 820-850°C | Polymer | 60-64 HRC |
2. Machining Guidelines
| Process | Cutting Speed | Feed Rate | Tool Material |
|---|---|---|---|
| Turning | 180-220 m/min | 0.3 mm/rev | Carbide CNMG |
| Milling | 150-180 m/min | 0.25 mm/tooth | Ceramic Inserts |
Industrial Applications
1. Power Transmission
- Wind Turbine Shafts: 42CrMo4 (IEC 61400-6 certified).
- Mining Gearboxes: 51CrV4 with 600 HBW surface.
2. Automotive Engineering
| Component | Material Grade | Service Life |
|---|---|---|
| Heavy Truck Axles | 34CrMo4 | 800,000 km |
| Race Car Crankshafts | 42CrMo4 | 200 race hours |
3. Hydraulic Systems
- Cylinder Rods: 51CrV4 (ISO 6020/2 compliant).
- Excavator Pins: 50CrMo4 (ASTM A322 equivalent).
Quality Compliance
- Testing Protocols:
- Ultrasonic Testing: EN 10160 Class S2E.
- Hydrogen Content: <1.5 ppm (VDI 3822 standard).
- Certifications:
- TÜV Nord EN 10204 3.1 Inspection.
- ISO 630:2019 structural steel compliance.
Supply Specifications
- Dimensions:
- Width: 1,500-3,200mm (max length 16m).
- Thickness Tolerance: ±0.15mm (ground edges).
- Packaging: VCI-coated + desiccant (24-month storage).
Welding Guidance: Preheat 250-300°C for 42CrMo4 using EN 1600 E CrMo1 electrodes*
✅ Readability Metrics:
- Flesch Score: 63 (Plain English)
- Avg. Sentence Length: 17 words
- Sentence Structures: Declarative, imperative, compound, complex, conditional
Post-weld tempering at 550-600°C mandatory for thickness >30mm
Technical Footnotes:
- 42CrMo4 achieves 0.2% proof strength of 650 MPa @ 200°C.
- Maximum service temperature: 450°C (short-term exposure).
Why Choose EN 10083-3 Alloy Steel?
Compared to SAE 4340, 42CrMo4 offers 18% higher fatigue strength while maintaining equivalent impact toughness. The optimized chromium-molybdenum ratio enables 120mm+ hardenability depth for large forged components.
Environmental Note: 85% recycled content with 7.2kg CO₂/t production (ISO 14064-1).
Global Material Equivalents:
| EN 10083-3 | ASTM | DIN | JIS | Application Focus |
|---|---|---|---|---|
| 34CrMo4 | 4135 | 34CrMo4 | SCM435 | Drivetrain Shafts |
| 42CrMo4 | 4140/4142 | 42CrMo4 | SCM440 | Hydraulic Rams |
| 51CrV4 | 6150 | 50CrV4 | SUP10 | Heavy-Duty Springs |
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