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Grade: EN C25E/1.1158
Equivalent Steel: DIN CK25/1.1158
C25E steel is a non-alloy quality carbon steel per EN 10250-2, characterized by a nominal carbon content of approximately 0.25%. Its chemical composition is balanced to provide moderate strength with good toughness. The carbon range is specified at 0.22–0.29%, with silicon up to 0.40% and manganese between 0.40% and 0.70%. Phosphorus and sulfur are controlled at maximum levels of 0.035% respectively to maintain cleanliness and fabricability. Residual elements including chromium, molybdenum, and nickel are each capped, with their combined total not exceeding 0.63%, ensuring consistent and predictable material performance.
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C25E
Qilu
C25E steel is a non-alloy quality carbon steel specified under EN 10250-2， with the material number 1.1158. It belongs to the unalloyed tempered steel family, designed for hardening and tempering treatments that achieve an optimal balance of strength and toughness.
The grade is also widely known by its DIN designation Ck25. With a nominal carbon content of approximately 0.25%, C25E offers moderate strength levels higher than low-carbon grades, while retaining good fabrication characteristics.
Country | Europe | Germany |
Standard | EN10250-2 | DIN 1720 |
Grade | C25E/1.1158 | CK25/1.1158 |
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
C25E/1.1158 | 0.22-0.29 | 0.40Max | 0.40-0.70 | 0.035Max | 0.035Max | 0.40Max | 0.10Max | 0.40Max |
| CK25 | 0.22-0.29 | 040Max | 0.40-0.70 | 0.035Max | 0.030Max | / | / | / |
Mechanical properties for C25E open die forgings steel in the normalized and normalized and tempered conditions according to EN10250-2.
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤100 | 440Mpa Min | 230Mpa Min | 23% Min | / | 35J Min | / |
100＜d≤250 | 420Mpa Min | 210Mpa Min | 23% Min | 17% Min | 30J Min | 20J Min |
| 250＜d≤500 | 400Mpa Min | 190Mpa Min | 23% Min | 17% Min | 25J Min | 15J Min |
| 500＜d≤1000 | 390Mpa Min | 180Mpa Min | 22% Min | 16% Min | 20J Min | 15J Min |
Mechanical properties for C25E open die forgings steel in the quenched and tempered conditions according to EN10250-2.
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤70 | 450Mpa Min | 270Mpa Min | 25% Min | / | 45J Min | / |
70＜d≤160 | 410Mpa Min | 220Mpa Min | 25% Min | 18% Min | 38J Min | 25J Min |
160＜d≤330 | 390Mpa Min | 210Mpa Min | 24% Min | 16% Min | 33J Min | 20J Min |
Remark: L= Longitudinal Tr = Transverse
Product type | Size range | Length |
Cold drawn bar | Φ3-Φ80mm | 6000-9000mm |
Hot rolled bar | Φ16-Φ310mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:3-200mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
| Process | Temperature | Cooling |
| Normalizing | 880–920 °C | Air |
| Soft Annealing | 650–700 °C | Slow cooling |
| Quenching | 860–900 °C | Water |
| Tempering | 550–660 °C | / |
| Forging | 1100–850 °C | / |
C25E non-alloy engineering steel is widely specified across automotive, machinery, and energy sectors for parts requiring moderate strength and high impact resistance:
Crankshafts, connecting rods, and transmission shafts
Machine tool spindles, levers, and forged fittings
Low-stress gears, bolts, fasteners, and agricultural equipment components
Hydraulic pump housings and structural flanges
A1: E means controlled sulphur and phosphorus range for improved internal quality and better response to quenching and tempering, compared with standard C25 steel.
A2: C25E is the modern EN ISO designation, while Ck25 is the old DIN grade. Both refer to the same material 1.1158 with similar chemical and mechanical requirements.
A3: Yes. C25E is designed for quenching and tempering. It can reach moderate hardness after QT treatment, suitable for parts requiring balanced toughness and strength.
A4: The primary difference is carbon content. C25E contains approximately 0.22–0.29% carbon, while C45E contains approximately 0.42–0.50% carbon. This difference affects hardness, strength, ductility and heat-treatment response.
For a C25E steel quotation, please provide the required diameter or dimensions, length, quantity, delivery condition, heat-treatment requirement and applicable standard.
