C40 CARBON STEEL |DIN 1.0511|AISI 1040|S40C
As a high-quality carbon structural steel, C40 is defined as a non-alloy steel with an average carbon content of about 0.4% as per European standards. C40 steel has high strength and good machinability, medium cold deformation plasticity, but poor in weldability and hardenability.
International Standard
| EU EN |
USA – |
Germany DIN,WNr |
Japan JIS |
France AFNOR |
England BS |
Italy UNI |
China GB |
Poland PN |
Czechia CSN |
Russia GOST |
Inter ISO |
|||||||||||||||||||
| C40 |
|
|
|
|
|
|
|
|
|
|
|
Available Types & Range
C 40 steel Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ20-Φ650 | Standard or As your request |
| Square bar | 25 x 25 – 450 x 450 | Standard or As your request |
| Plate/Sheet | Thickness :6 – 300 Width:80-1,250 |
Standard or As your request |
| Flat bar/Blcoks | Thickness :10 – 300 Width:120-25 – 500 |
Standard or As your request |
Chemical Composition & Technical Specification -C 40
| Grade | C | Si | Mn | P | S |
| C40/1.0511 | 0.37-0.44 | ≤ 0.4 | 0.50-0.80 | ≤ 0.045 | ≤ 0.045 |
Surface Finish&Tolerance
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
C40 Steel Mechanical Property
| Diameter d mm | ≤ 16 | 16-40 | 40-100 |
| Thickness t mm | < 8 | 8-20 | 20-60 |
| Yield Strength Mpa | ≥460 | ≥400 | ≥350 |
| Tensile Strength Mpa | 650-800 | 630-780 | 600-750 |
| Elongation, % | ≥16 | ≥18 | ≥19 |
| Reduction of area ,% | ≥35 | ≥40 | ≥45 |
C40 steel Forging
Forging temperature:950-1250℃,air cooling after forging.
Heat Treatment For C40 Steel
- Normalizing
The normalizing temperature range for this grade is typically 870-900ºC,followed by cooling in still air.
- Annealing
Full annealing of small C40 forgings is carried out from 840-890ºC,followed by furnace cooling at 28ºC per hour, to 650ºC soaking and air cooling.
- Hardening
Hardening of this grade is carried out from an austenitizing temperature of 830-860ºC followed by oil or water quenching.
- Tempering
Tempering after normal hardening and oil or water quenching is carried out at 400-680ºC to give the required mechanical properties as determined by practical experience.
C40 Steel Application
This grade of steel is used for forged parts where the strength and toughness of the material are appropriate. C40 may be used for the manufacture of forged crankshafts ,couplings, and cold headed parts,along with a range of parts where the properties of heat-treated C40 are suited to the application.
