EN47 Spring Steel

EN 47 is a chrome-vanadium based steel, EN 47 can be oil hardened and tempered if required. This process gives the material a good level of abrasion resistance with excellent toughness, these characteristics make it a good choice for applications exposed to stress, shock, and vibration.

This material is commonly used in the automotive industry for high-intensity applications such as crankshafts, leaf springs etc. This combined with a relatively low cost when compared with other alloy steels, makes the material quite an attractive option.

EN47 Applications 

This material is commonly used in the automotive industry for high-intensity applications such as crankshafts, leaf springs etc. This combined with a relatively low cost when compared with other alloy steels, makes the material quite an attractive option.

EN47 Chemical Properties 

Carbon Silicon Managnese Phosphorous Chromium Sulpur Vanadium
0.45-0.55% 0.50% 0.50-0.80% 0.06% 0.80-1.20% 0.06% 0.15%


To anneal EN47 heat it to between 820-840 Celsius, ensure that the material is held at this temperature for at least 2 hours or one hour for every 25mm of thickness. Allow to cool in the furnace slowly..EN47 Annealing

EN47 Hardening

Hardening EN47 should be done in stages; first heat to between 650-700 Celsius allow time for it to soak thoroughly, then to between 830-860 Celsius again allow time for it to soak. Quench the steel in oil.

EN47 Tempering

Related Standards:

BS 970 

ASTM A829

50CrV4

1.8159

Technical Information