Chinese (Simplified)

Surcharge Information

Due to the UK’s mostly commonly recognised surcharge mechanism no longer being openly published to the UK market we are unable to provide specific surcharge information on our website at this stage.

We are currently working with our suppliers to establish alternative mechanisms in order to provide a comprehensive and transparent view of global surcharge variations.

Look out for our improved surcharge pages appearing in the coming weeks.


722M24 grade steel is a chromium-molybdenum nitriding steel often supplied in the hardened and tempered condition (typically with 1075 N/mm² tensile strength).

After nitriding it develops a hard wear resistant case in the range of 61-65HRc with good resistance to shock and fatigue.

The relatively low temperature of the nitriding process produces components with a scale free surface and minimum distortion. No significant loss of surface hardness will result from operating temperature up to 500°C.

Size Range

32mm - 860mm Dia

Typical applications of 722M24 grade steel

  • Aircraft applications 
  • Crankshafts
  • Gears
  • Plastic moulds
  • Compressor discs
  • Pins
  • Spindles 
  • Bolts

722M24 steel is still often referred to as EN40B steel - its equivalent grade under the previous BS 970: 1955 standard.

Share this page


Rolled or Forged


Black Bar or Bright Bar