China Suppliers Factory: AISI 1045 S45C C45 Steel - Medium Carbon Steel with Good Weldability and Machinability
General Characteristics
1045/C45 steel is defined as medium carbon steel which has 0.4%-0.5% Carbon. It offers good weldability, good machinability, high strength and impact properties, but low in hardenability because of lack of suitable alloying elements.
Designation by Standards
| Mat. No. | DIN | EN | AISI |
|---|---|---|---|
| 1.0503 | C45 | - | 1045 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
|---|---|---|---|---|---|---|---|---|
| 0.46 | max. 0.40 | 0.65 | max. 0.40 | max. 0.10 | max. 0.40 | - | - | (Cr+Mo+Ni) = max. 0.63 |
Description
C45 is a medium carbon steel used when greater strength and hardness is desired than in the "as rolled" condition. Extreme size accuracy, straightness and concentricity combine to minimize wear in high speed applications. Turned, ground and polished.
Applications
Quenched and subsequently tempered steel for screws, forgings, wheel tires, shafts, sickles, axes, knives, wood working drills, hammers, etc.
Physical Properties
Average values at ambient temperature:
- Modulus of elasticity [103 x N/mm2]: 205
- Density [g/cm3]: 7.85
- Specific heat capacity [J/g.K]: 0.48
Coefficient of Linear Thermal Expansion 10-6 °C-1
| 20-100oC | 20-250oC | 20-500oC |
|---|---|---|
| 11.5 | 13.0 | 14.0 |
Heat Treatment & Processing
Soft Annealing
Heat to 680-710°C, cool slowly in furnace. This will produce a maximum Brinell hardness of 207.
Normalizing
Normalizing temperature: 840-880°C/air.
Hardening
Harden from a temperature of 820-860°C followed by water or oil quenching.
Tempering
Tempering temperature: 550-660°C/air.
Forging
Hot forming temperature: 1050-850°C.
Note: Diagram Tempering Temperature – Mechanical Properties
Mechanical Properties in Quenched + Tempered Condition
| Diameter d (mm) | Thickness t (mm) | 0.2 % proof stress (N/mm²) | Tensile strength (N/mm²) | Elongation A5 (%) | Reduction Z (%) |
|---|---|---|---|---|---|
| <16 | <8 | min. 490 | 700-850 | min. 14 | min. 35 |
| <17-40 | <8<=20 | min. 430 | 650-800 | min. 16 | min. 40 |
| <41-100 | <20<=60 | min. 370 | 630-780 | min. 17 | min. 45 |
Mechanical Properties in Normalized Condition
| Diameter d (mm) | Thickness t (mm) | 0.2% proof stress (N/mm²) | Tensile strength (N/mm²) | Elongation A5 (%) |
|---|---|---|---|---|
| <16 | <16 | min. 390 | min. 620 | min. 14 |
| <17-100 | <16<=100 | min. 305 | min. 305 | min. 16 |
| <101-250 | <100<250 | min. 275 | min. 560 | min. 16 |