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4145 mod - 1.1% Chromium-Molybdenum Through Hardening Steel

Surcharge

Scrap has fallen again for June 2019 on the back of reduced demand. Combined with slight falls in alloys, this has seen an overall reduction in surcharges this month.

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

info
£302.58 per tonne

Surcharge Price History for 4145 mod

JUN 18 SEP 18 DEC 18 MAR 19 TODAY
£336.46 £364.86 £368.21 £327.25 £302.58

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