AISI 1045 is a medium carbon steel containing approximately 0.45% carbon that can be hardened through heat treatment to achieve a maximum surface hardness of approximately Rockwell C 54–60 after flame or induction hardening. This combination of carbon content and hardenability allows 1045 to deliver a balance of strength, wear resistance, and toughness, making it suitable for a wide range of mechanical applications.
Soft annealed 1045 is commonly used for applications requiring moderate forming, while a spheroidized annealed condition is preferred where maximum cold formability is needed. Following heat treatment, the material develops improved surface hardness with a tough core, allowing it to perform effectively in components subject to repeated loading, abrasion, and contact stress. As a result, 1045 is widely used across industries for parts such as shafts, pins, bolts, and other components requiring greater strength and wear resistance than low carbon steels.
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AISI 1045 Chemical Composition
Chemical Composition (wt%) limits of AISI 1045 per ASTM A684*
| Copper | 81.0-85.0 | Antimony | 0.35 |
| Tin | 6.3-7.5 | Phosphorus | 1.50 |
| Lead | 6.0-8.0 | Sulfur | 0.08 |
| Zinc | 2.0-4.0 | Aluminum | 0.005 |
| Iron | 0.20 | Silicon | 0.005 |
| Nickel | 1.00 |
*Maximum, unless range is indicated
AISI 1045 Physical Properties
| Density, lb/in3 | 0.322 |
| Modulus of Elasticity, psi | 14,500 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 10 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 33.6 |
| Specific Heat, Btu/lb ˚F | 0.09 |
| Electrical Resistivity, Microhm-in | 2.8 |
AISI 1045 Standards
| ASTM A29 |
Your Source for AISI 1045
At Double Eagle Alloys, we supply AISI 1045 in long bar engineered for these demanding services. Contact our team to learn how AISI 1045 can support long-term performance and reliability.
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Data shown are typical and provided for informational purposes only. Values should not be considered minimums or maximums for specification or final design. Actual product data may vary, and information may be revised without notice.