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EN 9 Carbon Steel

CHEMICAL COMPOSITION (Typical Analysis in %)

C Mn P S Si Ni Cr Cu
0.17-0.24 0.7-1.00 ≤0.035 ≤0.035 0.17-0.37 ≤0.25 ≤0.25

EN 9 carbon steel is a common medium carbon and medium tensile steel, with improved strength over mild steel, through-hardening medium carbon steel. EN 9 carbon steel is also readily machinable in any condition.

EN 9 steels are generally used in the as supplied untreated condition. But EN 9 steels can be further surface-hardened by induction processes, producing components with enhanced wear resistance. Steel EN 9 materials in its heat treated forms possesses good homogenous metallurgical structures, giving consistent machining properties.


Annealing Heat slowly to 6 90-710°C, soak well. Cool slowly in the furnace.

Hardening Heat the component slowly to 920- 960°C and allow it to be heated through. Quench in oil or water.

EN 9 is widely used for many general engineering applications

Typical applications include shafts, studs, bolts, connecting rods, screws, rollers

raise temperature to 1050°C for forging. Do not forge below 950°C. After forging cool slowly, preferably in a furnace

Steel Properties :

EN 9 steel grade belongs to the standard of BS 970-1955, which is a standard for wrought steel for mechanical and allied engineering purpose. In BS 970 standards, there are some other common steel grades, like EN9, EN19, EN24, EN36 etc.

Heat Treatment

Soft annealing °C Cooling Hardness HB
940 – 970 Furnace max. 250

Stress-relief annealing °C approx. 660-710
Cooling Furnace

Hardening °C Quenching Hardness after quenching HRC
1000-1050 Air, oil or saltbath, 500-550 °C 63
Tempering °C after quenching 100 200 300 400 500 525 550 600
HRC 64 61.5 5 9.5 5 9.5 59 60 57 50