SAE/AISI 1045 / K1045 Round Bar (UNS G10450)
SAE/AISI 1045 / K1045 Round Bar is a medium-carbon steel widely used for components requiring high strength, toughness, and good wear resistance. K1045 is a killed steel variant of AISI 1045, produced with controlled deoxidation to ensure uniform chemical composition, improved soundness, and consistent mechanical properties. This grade responds exceptionally well to heat treatment, making it suitable for heavy-duty engineering and mechanical applications.
Key Features
- Medium carbon steel with high tensile strength
- Killed steel (K1045) for improved internal soundness
- Excellent response to quenching and tempering
- Good machinability in normalized condition
- Suitable for induction and flame hardening
- Higher wear resistance compared to low-carbon steels
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| DIN | C45 / 1.0503 |
| EN | EN8 |
| JIS | S45C |
| IS | IS 1570 Gr. 45C8 |
Sizes
- Diameter: 6 mm to 500 mm
- Length: 3 m, 6 m, or cut-to-length
- Special sizes available on request
AISI 1045/K1045 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.43 – 0.50 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.050 |
| Iron (Fe) | Balance |
SAE 1045 / K1045 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 585 – 670 MPa |
| Yield Strength | ~310 MPa |
| Elongation | 14 – 16% |
| Hardness | 170 – 210 HB |
UNS G10450 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1460°C |
| Thermal Conductivity | 49.8 W/m·K |
| Modulus of Elasticity | 205 GPa |
Types of SAE/AISI 1045 / K1045 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Round Bar
- Turned & Polished Round Bar
- Quenched & Tempered (Q&T) Round Bar
Applications
- Shafts, axles, and spindles
- Gears, pinions, and couplings
- Bolts, studs, and tie rods
- Automotive and heavy machinery parts
- Induction-hardened wear components
- Engineering and fabrication applications
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