0102030405
China Suppliers Factory for 1.0503 S45C G10450 AISI 1045 Medium Carbon Steel - High Strength & Weldability
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 Details
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.
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 |
Forging
Hot Forming Temperature
1050-850°C
Frequently Asked Questions (FAQ)
What are the main characteristics of 1045/C45 steel?
1045/C45 is a medium carbon steel containing 0.4%-0.5% carbon. It features good weldability, good machinability, high strength, and high impact properties. However, it has low hardenability due to a lack of suitable alloying elements.
What are the typical applications of C45 steel?
It is widely used in its quenched and tempered condition for components that require high strength, such as screws, forgings, wheel tires, shafts, sickles, axes, knives, wood working drills, and hammers.
What is the chemical composition of C45 steel?
C45 steel consists of approximately 0.46% Carbon (C), a maximum of 0.40% Silicon (Si), 0.65% Manganese (Mn), and maximums of 0.40% Chromium (Cr), 0.10% Molybdenum (Mo), and 0.40% Nickel (Ni), with the combined Cr+Mo+Ni content limited to a maximum of 0.63%.
What are the heat treatment temperatures for C45 steel?
Heat treatment includes Soft Annealing at 680-710°C (cool slowly in furnace), Normalizing at 840-880°C (air cooling), Hardening at 820-860°C (water or oil quenching), and Tempering at 550-660°C (air cooling).
What is the forging temperature range for C45 steel?
The recommended hot forming temperature range for forging C45 steel is between 1050°C and 850°C.