EN36A Case Hardening Steel
|EN36A is a 3.2% nickel - chromium high hardenability, case hardening (carburizing) steel, generally supplied in the annealed condition with a maximum brinell hardness of 255 (Rc26).
Characterised by high core strength, excellent toughness and fatigue resistance in relatively large sections with case hardness up to Rc62 when carburized, hardened and tempered.Characterised by high core strength, excellent toughness and fatigue resistance in relatively large sections with case hardness up to Rc62 when carburized, hardened and tempered.EN36A can also be used (uncarburised) as a high tensile steel, which when suitably hardened and tempered can be utilized for various applications requiring good tensile strength and excellent toughness.
Pre hardened and tempered (uncarburized) EN36A can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content.
EN36A (carburized) is used extensively by all industry sectors for components and shafts requiring high surface wear resistance, high core strength and impact properties. Typical uses are: Heavy Duty Bushings, Collets, Conveyor Pins, Heavy Duty Gears, King Pins, Ring Gears, Sprockets, Shafts etc..
|Colour Code||Stocked Sizes|
|Orange (Bar End)||Rounds|
|Min. %||Max. %|
|Test Bar Diameter mm||19|
|Tensile Strength Mpa||Min||1000|
|Izod Impact J||Min||40|
|Charpy Impact J||Min||35|
|*Annealed Brinell Hardness||Max||255|
|Tensile Strength Mpa||700/770|
|Yield Strength Mpa||540|
|Section Size mm||11||30||63|
|Tensile Strength Mpa||Min||1030||930||880|
|Yield Strength Mpa||Min||835||785||735|
|Charpy Impact J||Min||55||55|
|Tensile Strength Mpa||1140||1080||726|
|Yield Strength Mpa||896||865||540|
|Izod Impact J||95||95||135|
EN36A is however generally used in the carburised condition with heat treatment details as follows.
Following completion of forging operation, work piece should be cooled as slowly as possible in sand or dry lime etc.
Note: Case hardening steels due to their low carbon content are less susceptable to cracking than medium or high carbon steels, and may therefore be heated and cooled more rapidly.
N.B. The fairly high nickel content in EN36A will result in a lower case hardness, or a longer nitriding cycle than with other alloy grades containing less nickel.
|Direct Quench: Cool from carburizing temperature to 810 oC - 830 oC, hold until temperature is uniform throughout the section. Quench as required in water, oil or air cool. Alternatively quench in salt bath held at 150 oC - 250 oC, followed by air cool and temper immediately.
Or: Cool from carburizing temperature to room temperature, re-heat to 810 oC - 830 oC and hold until temperature is uniform throughout the section and quench or air cool as previous. Temper immediately.
|Suggested Pre-heat Temperature|