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835M30 - 4.5% Nickel-Chromium-Molybdenum Through Hardening Steel

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835M30 grade steel is a 4.5% Nickel-Chromium-Molybdenum through hardening steel which has the ability to harden in fairly large sections, giving strengths of over 1550N/mm².

Due to its high hardenability, these strengths are achievable by air from the hardening temperature.

This steel is used for applications requiring high tensile strengths for which more drastic quenches would produce distortion or cracking, especially in parts of intricate design.

Size Range

30mm - 400mm Dia

Typical applications of 835M30 grade steel

  • High duty gears
  • Pinions
  • Aero engine connection rods
  • Differential shafts and other transmission components
  • Airframe forgings
  • Heavy roller bearings
  • Breech mechanisms
  • Small arms components

835M30 steel is still often referred to as EN30B steel - its equivalent grade under the previous BS 970: 1955 standard.

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Rolled or Forged


Black Bar or Bright Bar

Grades for Potential Substitution (Greater)