C55/C55E/C55R/DIN1.0535 CARBON STEEL
C55/DIN 1.0535 Carbon Steel manufacturers and suppliers,supplied in round rods,square/flat bars,rollers,shafts,blocks and forging pieces.
C55/DIN1.0535 carbon steel is a medium carbon steel according to EN10083 and EN 10250 standard.It is usually supplied in an untreated or normalized condition for simple common application ,and also used in quenched and tempered condition for industrial applications. C55/DIN1.0535 steel is widely used for less exacting springs, shafts, bushings, crankshafts, etc.
1.Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | |
C55/DIN 1.0535 | Min | 0.52 | 0.6 | ||||||
| Max | 0.6 | 0.9 | 0.4 | 0.045 | 0.045 | 0.4 | 0.1 | 0.4 | |
C55E/DIN 1.1203 | Min | 0.52 | 0.6 | ||||||
| Max | 0.6 | 0.9 | 0.4 | 0.03 | 0.035 | 0.4 | 0.1 | 0.4 | |
C55R/DIN 1.1209 | Min | 0.52 | 0.6 | 0.02 | |||||
| Max | 0.6 | 0.9 | 0.4 | 0.03 | 0.04 | 0.4 | 0.1 | 0.4 |
Remark:Cr+Mo+Ni≤ 0.63%
2.Related Specifications
AISI/ASTM: 1055
BS:070M55 / EN9
JIS / KS:S55C
3.Critical Temperature for Heat Treatment of C55 steel
- Ac1:727℃
- Ac3:774℃
- Ar1:690℃
- Ar3:755℃
4.Heat Treatment For C55 Steel
- Normalizing:825℃-885℃,Cool in air
- Annealing:770-810℃,Cool in furnace
- Hardening:810 – 850°C,oil quench is recommended
- Tempering:550°C – 660°C, cool in still air
5.C55/C55E Steel Mechanical Property with Normalized and Tempered condition as per EN10250
| Thickness,mm | Tensile,Mpa | Yield,Mpa | Elongation,% |
| ≤100 | ≥640 | ≥330 | L:≥12 T:- |
| 100-250 | ≥620 | ≥300 | L:≥12 T:≥9 |
| 250-500 | ≥600 | ≥260 | L:≥12 T:≥9 |
| 500-1000 | ≥590 | ≥250 | L:≥11 T:≥8 |
6.C55E/DIN 1.1203 Steel Mechanical Property with Quenched and Tempered condition as per EN10250
| Thickness,mm | Tensile,Mpa | Yield,Mpa | Elongation,% |
| ≤70 | ≥700 | ≥420 | L:≥15 T:- |
| 700-160 | ≥630 | ≥360 | L:≥17 T:≥11 |
| 160-330 | ≥610 | ≥330 | L:≥16 T:≥10 |
7.Hardness Requirements for C55/C55E/C55R
- Treated to improve shearability(+S):≤255HBW
- Soft annealed(+A):≤229HBW
- Flame or induction hardening: Min 58HRC
- Water quenching hardness:60-65HRC
- C55 Steel Tempering Temperature Vs Hardness
| Quenching | Tempering Temperature,ºC | ||||||||
| Temperature,ºC | Hardness,HRC | 150ºC | 200ºC | 300ºC | 400ºC | 500ºC | 550ºC | 600ºC | 650ºC |
| 820ºC | 62-63 | 63 | 56 | 50 | 45 | 34 | 30 | 24 | 21 |
8.Supply Size & Condition
- Round Bars: Dia.80 – 1,000mm as Forged
- Flat / Square Bars: Thickness Max.800mm
- Shafts, Rollers, Blocks: Customized or According to Drawing
- Rolled Round Bars: Dia.16 – 250mm with UT Assurance
Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled
9.Quality Certification
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.Ultrasonic test report
