C45E Carbon Steel (EN 10083-2) — European Quench & Temper Grade for Machine Components
EN 10083-2 · Published: 2026-06-11 · Updated: 2026-06-12
C45E is the EN 10083 designation for medium-carbon steel intended for quenching and tempering. The 'E' suffix indicates controlled sulfur content for consistent hardenability. It is the European standard equivalent of AISI 1045. Used for shafts,...
C45E is the EN 10083 designation for medium-carbon steel intended for quenching and tempering. The 'E' suffix indicates controlled sulfur content for consistent hardenability. It is the European standard equivalent of AISI 1045. Used for shafts, gears, axles, bolts, and machine components requiring moderate strength and good machinability after normalizing.
Quick Facts
| Category | |
| Standard | EN 10083-2 |
| Density | 7.85 g/cm³ |
| Yield Strength | 340-490 MPa (depending on heat treatment) |
| Tensile Strength | 580-780 MPa |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| AISI 1045 | Compare |
| JIS S45C | Compare |
| GB 45 | Compare |
| DIN Ck45 | Compare |
Related Materials
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Frequently Asked Questions
C45E vs C45 — what does the 'E' suffix change?
The E suffix (C45E) indicates controlled sulfur content (0.020-0.040%) for consistent hardenability and machinability. Plain C45 (without E) has a wider sulfur range. For quench and temper applications where consistent hardness is critical, specify C45E. For general applications where precise hardenability is less important, C45 is acceptable and may be less expensive.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu