4130 Chromium-Molybdenum Alloy Steel
4130 alloy steel offers exceptional strength-to-weight performance with superior weldability and fatigue resistance, widely used in aerospace frameworks, high-stress automotive systems, and precision industrial machinery.
Product Summary
4130 Chromoly steel (UNS G41300) is a versatile low-alloy steel engineered for critical applications demanding high tensile strength (560-670 MPa) and thermal stability. Its optimized chromium (0.80-1.10%) and molybdenum (0.15-0.25%) composition ensures enhanced corrosion resistance and stress durability, making it ideal for structural components subjected to dynamic loads. Compliant with ASTM A29 and EN 1.7218 standards, this material supports CNC machining, forging, and heat treatment customization.
Key Technical Features
Mechanical Superiority
Ultimate Tensile Strength: 560-670 MPa (adjustable via heat treatment)
Impact Toughness: ≥27J at -18°C (Charpy V-notch tested per ASTM E23)
Hardness Range: 197-235 HB (Brinell, as-rolled condition)
Advanced Processability
Machinability Rating: 75% vs. 1212 steel baseline
Weldability: Excellent (pre-heat to 150-200°C for thickness >12mm)
Thermal Adaptability
Heat Treatment Options: Normalizing (899°C), Annealing (843°C), Quenching (816°C oil)
Dimensional Stability: ±0.0005"/inch post-treatment
Industrial Applications
| Sector | Key Components | Performance Metrics |
|---|---|---|
| Aerospace | Engine mounts, Landing gear | 18% weight reduction vs. carbon steel |
| Automotive | Roll cages, Driveshafts | 22% higher fatigue life (SAE J1099 tested) |
| Energy | Drill collars, Blowout preventers | H2S corrosion resistance (NACE MR0175 compliant) |
| Defense | Armor substrates, Artillery parts | MIL-DTL-46100E ballistic certification |
Global Standard Compliance
ASTM (USA)
A29/A29M: Standard specification for steel bars
A322: Alloy steel bars for high-stress components
International Equivalents
EN 1.7218 (Europe)
JIS SCM430 (Japan)
GB 30CrMo (China)
Chemical Composition & Functional Roles
| Element | Content (%) | Technical Purpose |
|---|---|---|
| Carbon (C) | 0.28-0.33 | Enhances core strength and hardenability |
| Chromium (Cr) | 0.80-1.10 | Improves corrosion/wear resistance |
| Molybdenum (Mo) | 0.15-0.25 | Stabilizes microstructure at high temps |
| Manganese (Mn) | 0.40-0.60 | Controls sulfur content, aids forgeability |
| Silicon (Si) | 0.15-0.35 | Strengthens ferrite matrix |
Trace Elements: P ≤0.035%, S ≤0.040% (strictly controlled for weldability)
