EN8A

This metal is just a little bit stronger than mild steel(EN1 / EN1A) It is used for electric motor armature spindles, but they do not harden it in this application. EN8 can be case hardened. It is also identified by the yellow paint . the hardness is dependent on the type of heat treatment-applied to it, and can be measured in the Rockwell scale A to C, or in a Brinell scale number that can range between 79 and 946. Or you could use a Diamond impression that will range between 2.30 to 4.30. Or did you mean the tensile strength of the metal, how much load it would take before it will bend.

The typical composition of EN8 is: Carbon 0.35 / 0.45, Silicon 0.05 / 0.35, Manganese 0.60 / 1.10, Sulphur 0.06 max, Phosphorous 0.06 max,

CONDITION:

Normalised 830-860 degrees C. Limiting ruling section 6" Diameter.

Maximum Stress (tons/ sq. ins.) 35min.

Elongation(%) :20min.

Brinell Hardness (3,000kg.load) : 152 - 207.

Cold drawn: Limiting ruling section 1.5".

Maximum stress (tons/ sq. ins) 38 min.

Elongation (%) : 12min.

Brinell hardness (3,000kg. load): 229max.

Harden 830 - 860 degrees C. QUENCH IN OIL.

Limiting ruling section:2".

Maximum stress: 40 min.

Elongation (%).: 22min.

Izod impact (ft.lb.) : 25 min.

Brinell hardness(3,000kg.load) :179 - 229.

Temper 550-660 degreesC. UPTO1/2".Limiting ruling section.

Maximum stress (tons /sq.ins.) 45min.

Elongation (%) : 20min.

Izod impact (ft.lb.): 40min

Brinell hardness (3,000kg.load): 201 - 255.

EN8A.

Carbon : 0.33 - 0.38

Silicon : 0.05 - 0.35

Manganese : 0.70 - 0.90

Sulphur ; 0.06 max.

Phosphorous : 0.06 max.

Condition and Physical properties supplied to specification only.

EN8M

Carbon: 0.35 - 0.45

Silicon : 0.25 max

Manganese : 0.90 - 1.20

Sulphur : 0.12 - 0.20

Phosphorus ; 0.07 max.

Condition and physical properties as EN8 Specification.

General information.

A steel to prescribed mechanical properties suitable for Axles, spindles,etc. subject to shock and vibration. For components required hardened and tempered.

I hope this is what you required. All the best with the things you are going to make with EN8.

Lot information I got just as a spectator. Thank you Very much.

Im glad that i could be of help to you. and that you found the reply of interest.