Description
EN8 Flat Bar
EN8 Flat Bars is also know as 080M40, is an unalloyed medium carbon steel. EN8 is a medium strength steel with good tensile strength. EN8 is used in applications where better properties than mild steel are required but where the costs do not justify the purchase of a steel alloy. EN8 can be heat treated to provide a good surface hardness and moderate wear resistance by flame or induction hardening processes.
EN8 Carbon Steel is a common medium carbon and medium tensile steel, with improved strength over mild steel, through-hardening medium carbon steel. EN8 carbon steel is also readily machinable in any condition.
EN8 is suitable for the manufacture of parts such as general-purpose axles and shafts, gears, bolts and studs. It can be further surface-hardened typically to 50-55 HRC by induction processes, producing components with enhanced wear resistance. For such applications the use of EN8D (080A42) is advisable.
EN8 in its heat treated forms possesses good homogenous metallurgical structures, giving consistent machining properties.
Good heat treatment results on sections larger than 63mm may still be achievable, but it should be noted that a fall-off in mechanical properties would be apparent approaching the centre of the bar.
Chemical Composition of EN8 (080M40) :
| 080M40 (EN8) Specification | |
| Chemical composition | |
| Carbon | 0.36-0.44% |
| Silicon | 0.10-0.40% |
| Manganese | 0.60-1.00% |
| Sulphur | 0.050 Max |
| Phosphorus | 0.050 Max |
Related material specifications :
BS970: 1955 EN8
BS970/PD970: 1970 onwards 080M40
European C40, C45, Ck40,Ck45, Cm40, Cm45
Werkstoff No. 1.0511, 1.1186, 1.1189
US SAE (AISI) 1039, 1040, 1042, 1043, 1045
Key features of EN8 / EN8D Flat Bar:
• Unalloyed medium carbon steel
• Reasonable tensile strength
• Can be flame or induction hardened
• Readily machinable
• Moderate wear resistance if heat treated
Applications of EN8 / EN8D Flat Bar :
• Automotive parts
• Connecting rods
• Studs, bolts
• Axles, spindles
• General engineering components
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