AISI 1045 / C45 Medium Carbon SteelForging Metallurgy & Specs
Medium Carbon High-Strength Forging Steel for Shafts, Axles & Gears. Hot-forged and precision-machined in Rajkot, Gujarat strictly up to 50 kg max piece weight with 100% Optical Emission Spectrometry (OES) PMI testing and EN 10204 3.1 MTC compliance.
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AISI 1045 / C45 Medium Carbon Steel (UNS G10450 / 1.1191 / C45E / CK45) offers a minimum tensile strength of 570 – 700 MPa (82 – 102 ksi) and yield strength of 310 – 380 MPa (45 – 55 ksi) with 170 – 210 HBW (as-forged/normalized), up to 58 HRC after induction hardening hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Requires protective plating, phosphate coating, or oil film. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
AISI 1045 / C45 Medium Carbon Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | 0.43% | 0.50% | Controls base tensile strength & core hardness |
| Manganese | Mn | 0.60% | 0.90% | Combines with sulfur, increases hardenability and hot workability |
| Phosphorus | P | — | 0.04% | Restricted to prevent temper embrittlement |
| Sulfur | S | — | 0.05% | Strictly controlled for cleaner grain flow and micro-cleanliness |
| Silicon | Si | 0.15% | 0.35% | Deoxidizer during melting; improves high-temperature scaling resistance |
* Ladle chemical analysis verified using optical emission spectrometer (OES) calibrated to NIST certified reference materials. Full chemical results recorded on EN 10204 3.1 MTC.
AISI 1045 / C45 Medium Carbon Steel Mechanical Properties
Ultimate breaking stress threshold
Elastic deformation limit
Plastic ductility before rupture
Surface indentation resistance
Cross-sectional necking ductile ratio
Dynamic fracture energy absorption
Thermal Cycle & Machining Parameters
1180°C – 850°C (2150°F – 1560°F)
Normalized at 840°C – 880°C; induction or flame hardened to 55-60 HRC for wear surfaces
Requires protective plating, phosphate coating, or oil film
Machinability: 64% of AISI 1212 • Moderate; requires 200°C – 300°C preheat and post-weld stress relief to prevent cracking
International Equivalent Material Grades
Forged Components Manufactured in AISI 1045
Forged Gear Blanks & Pinions
Hot-forged spur, helical, and bevel gear blanks with directional grain flow.
Heavy Transmission Couplings
Rigid and flexible drive shaft couplings for industrial reducers.
AISI 1045 Frequently Asked Technical Questions
Yes, AISI 1045 is one of the most cost-effective grades for induction or flame hardening, enabling surface hardness of 54 to 58 HRC on gear teeth while maintaining a tough, resilient core.
Related Industrial Metallurgy Specifications
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Manufactured in Rajkot, Gujarat strictly up to 50 kg max piece weight. 4-hour quote turnaround committed.