Peeled Round Bars / Carbon Steel
AISI 1045
Medium Carbon Steel
Material Overview
AISI 1045 - Medium Carbon Steel
Material Type
Composition: ~0.45% carbon
Key Benefit: Higher strength with heat treatment capability
Characteristics
- Strength: Higher tensile strength than 1018
- Heat Treatment: Can be quenched and tempered
- Machinability: Good in annealed condition
- Wear Resistance: Better than low carbon steels
Mechanical Properties
| Tensile Strength (Annealed): | 570-700 MPa |
| Yield Strength: | 310 MPa |
| Hardness (Annealed): | 170-210 HB |
| Hardness (Heat Treated): | Up to 55 HRC |
Applications
- Crankshafts and connecting rods
- Axles and drive shafts
- Gears and pinions
- Bolts and studs (high strength)
- Hydraulic shafts and cylinders
- Machine tool components
- General engineering parts requiring strength
Advantages
- Heat Treatable: Can achieve high hardness and strength
- Good Strength: Higher strength than low carbon steels
- Versatile: Suitable for wide range of applications
- Cost-Effective: Good balance of properties and cost
- Wear Resistance: Better than 1018 when heat treated
Heat Treatment
- Normalizing: 870-900°C, air cool
- Hardening: 820-850°C, water or oil quench
- Tempering: 540-650°C for desired hardness
- Annealing: 790-815°C, furnace cool
Processing Characteristics
- Machining: Good in annealed condition, difficult when hardened
- Welding: Fair - requires pre-heat and slow cooling
- Forming: Good in annealed condition
- Grinding: Excellent after heat treatment