EN 10083-3 4135/4140/4142/6150 Alloy Structural Steel Coil

EN 10083-3 is a ‌chromium-molybdenum-vanadium alloy steel‌ designed for quenched and tempered parts requiring exceptional strength and fatigue resistance. Grades like ‌34CrMo4‌, ‌42CrMo4‌, and ‌51CrV4‌ deliver ‌900–1,300 MPa tensile strength‌ with superior hardenability, meeting ‌ISO 683-18‌ and ‌ASTM A322‌ standards. Ideal for automotive, energy, and heavy machinery, it replaces costlier alloys in gear shafts, drill collars, and turbine blades operating at -40°C to 500°C.

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Product Introduction

‌EN 10083-3 Alloy Structural Steel Coil: High-Strength Quenched & Tempered Steel for Heavy-Duty Components‌


‌EN 10083-3 4135/4140/4142/6150 Alloy Structural Steel Coil Product Overview‌

EN 10083-3 is a ‌chromium-molybdenum-vanadium alloy steel‌ designed for quenched and tempered parts requiring exceptional strength and fatigue resistance. Grades like ‌34CrMo4‌, ‌42CrMo4‌, and ‌51CrV4‌ deliver ‌900–1,300 MPa tensile strength‌ with superior hardenability, meeting ‌ISO 683-18‌ and ‌ASTM A322‌ standards. Ideal for automotive, energy, and heavy machinery, it replaces costlier alloys in gear shafts, drill collars, and turbine blades operating at -40°C to 500°C.


‌Key Technical Specifications‌

‌1. Manufacturing & Dimensional Tolerances‌

  • ‌Process‌:
    • Hot-rolled: 2.75–160mm (±1.5% thickness tolerance per EN 10029)
    • Cold-rolled: 0.2–3mm (±0.2% tolerance for precision gears)
  • ‌Width‌: 45–2,200mm (EDM/laser-cutting compatible)
  • ‌Surface‌: Shot-peened (0.8–1.2mm Almen intensity) or phosphated (5–15μm coating)

‌2. Chemical Composition‌

Grade C (%) Cr (%) Mo (%) V (%) Key Alloy Features
‌34CrMo4‌ 0.30–0.37 0.90–1.20 0.15–0.30 Moderate strength, high toughness
‌42CrMo4‌ 0.38–0.45 0.90–1.20 0.15–0.30 Oil quench for deep hardening
‌51CrV4‌ 0.47–0.55 0.90–1.20 0.10–0.25 Vanadium-enhanced fatigue resistance

Trace elements:

  • ‌Mn‌: 0.50–1.10%, ‌Si‌: ≤0.40%, ‌P/S‌: ≤0.025%

‌Mechanical Properties‌

Grade Thickness (mm) Yield (MPa) Tensile (MPa) Elongation (%) Impact (J @ -20°C)
‌34CrMo4‌ ≤20 ≥750 1,000–1,200 11 45
‌42CrMo4‌ ≤60 ≥900 1,100–1,350 10 35
‌51CrV4‌ ≤100 ≥500 750–950 13 50

Test standards:

  • ‌Tensile‌: EN ISO 6892-1 (strain rate 0.006/min)
  • ‌Impact‌: EN ISO 148-1 (Charpy V-notch, 10x10mm)
  • ‌Hardenability‌: Jominy test (42CrMo4: HRC 50 at 12mm depth)

‌Performance Advantages‌

  1. ‌Hardenability‌:
    • ‌Critical diameter‌: 120mm (42CrMo4 oil-quenched)
    • ‌Case depth‌: 4–6mm after carburizing (51CrV4)
  2. ‌Fatigue Resistance‌:
    • ‌Endurance limit‌: 550 MPa @ 10⁷ cycles (34CrMo4)
    • ‌SN curve slope‌: -0.1 for automotive crankshafts
  3. ‌Weldability‌:
    • ‌Preheat‌: 250–300°C (GTAW with ER80S-B2 filler)
    • ‌Post-weld heat treatment‌: 620–660°C tempering
  4. ‌Temperature Stability‌:
    • ‌Creep strength‌: 200 MPa @ 400°C (42CrMo4)
    • ‌Thermal expansion‌: 12.5 µm/m·°C (20–500°C)

‌Applications‌

Industry Use Case Recommended Grade
‌Automotive‌ Transmission gears (HRC 55–60) 42CrMo4
‌Oil & Gas‌ Drill collars (API 7-1 compliant) 34CrMo4
‌Renewables‌ Wind turbine shafts (EN 10293) 51CrV4

‌Global Equivalents‌

EN 10083-3 ASTM DIN JIS GB/T 3077
34CrMo4 4135 34CrMo4 SCM435 35CrMo
42CrMo4 4140 42CrMo4 SCM440 42CrMo
51CrV4 6150 50CrV4 SUP10 50CrVA

‌Sustainability & Compliance‌

  • ‌Recycled Content‌: 85% (certified per EN 10020)
  • ‌RoHS Compliance‌: Pb <0.01%, Cd <0.005%
  • ‌Certifications‌: TÜV Nord, IATF 16949 (automotive)

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Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

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