AISI 4145 Steel Round Bar

AISI 4145 Steel Round Bar alloy Steel bar
Superior Strength & Durability for Demanding Applications
AISI 4145 is a chromium molybdenum alloy steel renowned for its exceptional combination of high tensile strength, impact resistance, and fatigue endurance. Ideal for critical components in automotive, aerospace, oil & gas, and heavy machinery sectors, our round bars ensure reliability in extreme conditions.
Customization Options
- Diameter Range: 6mm–300mm
- Lengths: Cut-to-order up to 12 meters
- Surface Finish: Black, peeled, polished
- Certifications: ISO 9001, SGS, Mill Test Certificat
Packaging & Delivery
- Secure Packaging: Wrapped in waterproof paper, bundled with steel straps.
- Global Shipping: FCL/LCL options via major ports.
- Lead Time: 7-15 days depending on order volume.
AISI 4145 Steel Round Bar Key Advantages:
✅ High Hardness & Wear Resistance: Optimized for parts subject to friction.
✅ Excellent Heat Treatability: Maintains integrity after quenching and tempering.
✅ Corrosion Resistance: Suitable for harsh environments with proper surface treatment.
✅ Dimensional Precision: Manufactured to ASTM A29/A29M standards.
Applications
- Automotive: Axles, gears, crankshafts
- Aerospace: Landing gear components, structural parts
- Oil & Gas: Drill collars, valves, connectors
- Industrial Equipment: Bolts, shafts, heavy-duty fasteners


AISI 4145 Steel Round Bar Chemical Composition and mechanical properties
Chemical Composition
Element | Percentage (%) |
Carbon (C) | 0.43–0.48 |
Manganese (Mn) | 0.70–0.90 |
Phosphorus (P) | ≤0.035 |
Sulfur (S) | ≤0.040 |
Silicon (Si) | 0.15–0.35 |
Chromium (Cr) | 0.80–1.10 |
Molybdenum (Mo) | 0.15–0.25 |
Mechanical Properties
- Tensile Strength:Up to 1030 MPa (Quenched & Tempered)
- Yield Strength:≥860 MPa
- Elongation:≥12%
- Hardness:28–34 HRC (Typical Heat Treatment)

Why Choose Us?
- Direct Manufacturer: Competitive pricing, no middlemen.
- Quality Assurance: 100% non-destructive testing (NDT) available.
- Fast Response: 24/7 customer support for inquiries and quotes.
Contact Us TodayFor technical data sheets, sample requests, or customized orders, reach out to our team:📧 sales@yourcompany.com🌐 www.hydc-rod.com