30CrMnSiA Alloy Steel Plate

30CrMnSiA alloy steel plate is a premium quenched-and-tempered (Q&T) structural steel renowned for its exceptional strength, wear resistance, and adaptability to high-stress environments12. Widely utilized in aerospace, military, and automotive sectors, this Cr-Mn-Si alloy combines precise heat treatment compatibility with superior mechanical properties, making it indispensable for mission-critical components.

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Product Introduction

‌30CrMnSiA Alloy Steel Plate: High-Performance Solution for Critical Structural Applications‌
30CrMnSiA alloy steel plate is a premium quenched-and-tempered (Q&T) structural steel renowned for its exceptional strength, wear resistance, and adaptability to high-stress environments12. Widely utilized in aerospace, military, and automotive sectors, this Cr-Mn-Si alloy combines precise heat treatment compatibility with superior mechanical properties, making it indispensable for mission-critical components.


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‌Key Features & Technical Advantages‌

  1. ‌Optimized Composition‌:
    • ‌Chromium (0.80–1.10%)‌: Enhances wear resistance and high-temperature stability.
    • ‌Manganese (0.80–1.10%)‌: Improves hardenability and tensile strength.
    • ‌Silicon (0.90–1.20%)‌: Boosts oxidation resistance and hardenability while reducing brittle fracture risks.
  2. ‌Mechanical Properties (Post Q&T)‌:
    • ‌Tensile Strength‌: 1,080–1,180 MPa – Ideal for components requiring resistance to dynamic loads.
    • ‌Yield Strength‌: ≥835 MPa – Minimizes deformation under extreme stress.
    • ‌Elongation‌: ≥10% – Balances ductility with rigidity for complex forming
    • ‌Impact Toughness‌: ≥39 J at 20°C – Ensures reliability in low-temperature environments.
  3. ‌Heat Treatment Flexibility‌:
    • ‌Quenching‌: 880°C oil cooling for uniform microstructure.
    • ‌Tempering‌: 520°C water/oil cooling to optimize toughness and residual stress relief.
    • ‌Hardness‌: 217–255 HB (annealed); 300–350 HB (Q&T).

‌Applications Across Industries‌

30CrMnSiA’s unique properties suit high-performance scenarios:

  • ‌Aerospace‌: Landing gear, aircraft frames, and engine mounts.
  • ‌Military‌: Armored vehicle parts, firearm components, and missile systems.
  • ‌Automotive‌: Gears, crankshafts, and drivetrain assemblies.
  • ‌Industrial Machinery‌: Hydraulic press shafts, mining equipment, and high-stress bearings.

‌Global Equivalents & Standards‌

‌Standard‌ ‌Equivalent Grade‌ ‌Key Specifications‌
‌China (GB)‌ 30CrMnSiA GJB2150A-2015, GB/T3077-1988
‌USA (AISI/SAE)‌ 4130 ASTM A29 (approximate)
‌Germany (DIN)‌ 1.7216 DIN 17200
‌Japan (JIS)‌ SCM430 JIS G4105

‌Chemical Composition & Quality Control‌

‌Element‌ ‌Composition (%)‌ ‌Function‌
Carbon (C) 0.28–0.34 Enhances hardness and wear resistance
Silicon (Si) 0.90–1.20 Improves strength and oxidation resistance
Chromium (Cr) 0.80–1.10 Boosts corrosion and heat resistance
Phosphorus (P) ≤0.035 Minimized to prevent brittleness
Sulfur (S) ≤0.035 Controlled for optimal weldability.
  • ‌Testing Protocols‌: Ultrasonic flaw detection, Rockwell/Brinell hardness testing, and Charpy impact tests
  • ‌Certification‌: EN 10204/3.1 mill certificates with full traceability.

‌Production & Supply‌

  • ‌Dimensions‌:
    • Thickness: 6–200 mm
    • Width: 500–4,000 mm
    • Length: 1,000–12,000 mm.
  • ‌Monthly Capacity‌: 1,000+ tons – Ensures rapid delivery for bulk orders.
  • ‌Customization‌: Available in normalized, annealed, or Q&T conditions per application requirements.

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.

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.

Tel: +86 15635685959

E-mail: [email protected]  

WhatsApp: +86 18912200505

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