EN 8 Series Steel

Rs 52 / Kg

EN8 also know as 080M40. Unalloyed medium carbon steel. EN8 is a medium strength steel, good tensile strength. Suitable for shafts, stressed pins, studs, keys etc. AISI 1040.
Available as normalized or rolled. EN8 is supplied as round drawn/turned, round hot rolled, hexagon, square, flats and plate.

EN8 is usually supplied untreated but can be supplied to order in the normalized or finally heat treated (quenched and tempered to ”Q” or “R”properties for limiting ruling sections up to 63mm), which is adequate for a wide range of applications. Please refer to our selection guide for comparisons.

EN8 is a very popular grade of through-hardening medium carbon steel, which is readily machinable in any condition. (Refer to our machinability guide). 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. It is also available in a free-machining version, EN8M (212A42)

EN8 in its heat treated forms possesses good homogenous metallurgical structures, giving consistent machining properties.

Chemical composition

Heat Treatment

● EN8 or 080m40 can be tempered at a heat of between 550°C to 660°C (1022°F-1220°F), heating for about 1 hour for every inch of thickness, then cool in oil or water.

● Normalizing of EN8 bright mild steel takes place at 830-860°C (1526°F-1580°F) then it is cooled in air. Welding

● Modern EN8 bright mild steel contains a lot less carbon then it uses to, this mean that it is possible to weld pieces up to 18mm thick without preheating using MIG wire (SG2) or a 7018 electrode.

● Over 18mm would require a pre-heat of 100°C (212°F) in order to prevent cracking. Flame Cut Profiles A hard edge can occur when flame cutting EN8 plate, therefore this grade is commonly normalized after flame cutting. EN8 flame cut profiles can be supplied Lumsden ground or precision ground. Ground Flat Stock Precision ground flat stock / gauge plate can be produced using EN8 steel. Subject to size suitability and availability of raw material pieces can be produced in approximately 2 to 3 weeks. Standard and non-standard sizes are available. Applications EN8 is widely used for many general engineering applications. Typical applications include shafts, studs, bolts, connecting rods, screws, rollers. Forging Preheat the steel carefully, and then raise temperature to 1050°C for forging. Do not forge below 850°C. After forging cool slowly, preferably in a furnace. Annealing Heat slowly to 680-710°C, soak well. Cool slowly in the furnace. Hardening Heat the component slowly to 820-860°C and allow it to be heated through. Quench in oil or water. Tempering Temper the EN8 component immediately after quenching whilst tools are still hand warm. Re-heat the EN8 component to the tempering temperature then soak for one hour per 25 millimeter of total thickness (2 hours minimum) Cool in air. Welding We recommend you contact your welding consumables supplier who should provide you full assistance and information on welding EN8 steel.