EN39 Case Hardening Steel

EN39 steel suppliers and stockholders. EN39 is a 4.5% nickel, chromium, molybdenum grade available as full bar lengths or cut pieces with delivery to the whole of the UK. It is suitable for case hardening to give a case resistant surface with a high core strength up to 1310 N/mm². This grade is commonly supplied as round bar. EN39B and EN39C are common standards for this grade.

We welcome export enquiries for EN39 EN39B case hardening steel. Contact our sales office and consult our shipping policy for details.

Popular case hardening grades we supply

16MnCr5 | 20MnCr5 | 8620 | EN32 | EN36 | EN39

Alternative grades we supply

EN16T | EN19T | EN24T | EN26W | EN30B | EN31 | EN32 | EN36 | EN40B | EN41B |

Form of Supply

West Yorkshire Steel are stockholders and suppliers of EN39 round bar. Diameters in grade EN39 can be sawn to your required lengths as one offs or multiple cut pieces. Ground steel bar can be supplied, providing a case hardening steel precision ground bar to tight tolerances.

Click here to contact our experienced sales team who will assist you with your EN39 case hardening steel enquiry.

  • Diameter

Click on the headings below for further information


As a carburising steel with high core strength it is suitable for heavy duty applications such as roller bearings, shafts and clutch plates.

Carbon 0.12-0.18% Nickel 3.90-4.30%
Manganese 0.25-0.50% Molybdenum 0.15-0.30%
Silicon 0.10-0.35% Sulphur 0.040% max
Phosphorous 0.035% max

Case hardening of EN39 will give a hard wear resistant surface and a tough core strength to the steel. Surfaces must be free from dirt and grease, and of low sulphur content. Case hardening can be carried out in salt baths with selected content depending on the type of salt and the depth of penetration required. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Time, temperatures and salt selection will be advised by your heat treatment provider.

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each EN39 component. Other considerations during the heat treatment process include the type of furnace, quenching medium and the work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of EN39 steel.

EN39 case hardening steel is available with BS EN 10204 3.1 mill certificate, please request when placing any orders.