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4145 mod - 1.1% Chromium-Molybdenum Through Hardening Steel

Surcharge

Both Scrap and most alloys saw a small increase going into April, meaning surcharges for the majority of grades increased slightly.

Nickel has been rising steadily (albeit not significantly) in recent weeks and therefore we would expect to see this filter through to the surcharges in the coming weeks.

Surcharge information as listed via Liberty Speciality Steels where possible, other based on mean chemical analysis for the given grade.

info
£336.54 per tonne

Surcharge Price History for 4145 mod

APR 18 JUL 18 OCT 18 JAN 19 TODAY
£329.83 £348.04 £348.79 £377.45 £336.54

Description

4145 mod grade steel is a chromium-molybdenum through hardening steel typically used for downhole applications.

Similar to 4140, except with a higher carbon level resulting in greater strength, hardenability and ruling sections, which makes this grade more suitable for applications with larger section size and higher strength requirements.

In the ‘as-quenched’ state, hardnesses of 55-62HRc are achievable.

This grade demonstrates good forgeability but must be controlled through cooling due to its susceptibility to cracking. Care should also be taken when quenching, ensuring control over the quench medium, for the same reasons.

Impact toughness is reduced due to the increased carbon content. Weldability is also poor and is often carried out by more sophisticated methods such as plasma arc or electron beam.

Typical applications of 4145 mod grade steel

  • Drill collars
  • Drill bits
  • Crossover subs
  • Tool joints

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PRODUCTION METHOD

Rolled or Forged

FINISHES

Black Bar or Bright Bar