As a high-quality carbon structural steel, C50 steel is defined as a non-alloy steel with an average carbon content of about 0.50% as per European standards.
As a medium carbon steel, C50 steel has high strength and hardness, medium machinability, but low cold deformation plasticity and poor weldability.
C50 steel is usually used after heat treatment such as normalizing or quenching and tempering, or high-frequency surface quenching.It is usually used for parts that require high strength, wear resistance or elasticity, and small dynamic load and impact load, such as forged gears, machine tool spindles, engine spindles, rolls, tie rods, spring washers, etc.
International Standard
| EU EN |
USA – |
Germany DIN,WNr |
Japan JIS |
France AFNOR |
England BS |
Italy UNI |
China GB |
Sweden SS |
Czechia CSN |
Russia GOST |
Inter ISO |
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Available Types & Range
C 50 Steel Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ50 -Φ650 | Standard or As your request |
| Square bar | 100 x 100 – 450 x 450 | Standard or As your request |
| Forged Flat | 100 x 50 – 400x 650 | Standard or As your request |
Chemical Composition & Technical Specification – C50
| Standard | Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| EN10250 | C50/1.0540 | 0.47-0.55 | ≤0.4 | 0.60-0.90 | ≤0.045 | ≤0.045 | ≤ 0.4 | ≤ 0.1 | ≤ 0.4 |
| SEW550 | CK50/1.1206 | 0.47-0.55 | ≤0.35 | 0.60-0.90 | ≤0.035 | ≤0.035 | – | – | – |
| DIN17200 | CK50/1.1206 | 0.47-0.55 | ≤0.4 | 0.60-0.90 | ≤0.035 | ≤0.03 | – | – | – |
C50 STEEL PHYSICAL PROPERTY
| Density, g/cm3 | 7.86 |
| Specific heat capacity，(0~100℃),J/(kg.k) | 498 |
| Linear expansion coefficient,10^-6/k | 12.06(0-100℃) |
| Poisson’s ratio | 0.29 |
| Elastic Modulus,Mpa | 207407 |
| Shear modulus,Mpa | 81100 |
| Thermal conductivity,W/(m.K) | 47 |
C50 STEEL FORGING
- Initial Forging Temperature：1200℃
- Final Forging Temperature：850℃
- Forging Ratio：above 4:1
- Post-Forging Treatment:C50 steel should be slowly cooling after forged.
C50 STEEL HEAT TREATMENT
Critical Temperature for Heat Treatment of C50 Steel
- Ac1:725℃
- Ac3:760℃
- Ar1:690℃
- Ar3:721℃
Temperature Selection for Conventional Heat treatment for C50 Steel
- Annealing:820 – 840°C,Cooling in furnace,hardness below 187 HBW
- Normalizing:820-870°C,Cooling in air,hardness about 217HBW
- Quenching:810-850°C,Medium:Water\Oil
- Tempering:550-660°C
C50 Steel Mechanical Property with Quenched and Tempered Condition
| Tensile Strength Mpa |
Yield Strength Mpa |
Elongation % |
Reduction of Area % |
Impact Charpy-V J |
| ≥630 | ≥375 | ≥14 | ≥40 | ≥31 |
C50 Steel Tempering Temperature Vs Hardness
| Grade | Quenching | Tempering Temperature,ºC | |||||||
| Temperature,ºC | Hardness,HRC | 150ºC | 200ºC | 300ºC | 400ºC | 500ºC | 550ºC | 600ºC | |
| C50 | 830ºC | 58-59 | 58 | 55 | 50 | 41 | 33 | 26 | 22 |
