4145 mod

1.1% Chromium-Molybdenum Through Hardening Steel

Surcharge

£492.09 per tonne

Surcharge Price History for 4145 mod

NOV 21 FEB 22 MAY 22 AUG 22 TODAY
£515.58 £514.56 £771.26 £642.00 £492.09

Product Method

Rolled or Forged

Finishes

Black Bar or Bright Bar

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.

Size Range

32mm - 860mm Dia

Typical applications of 4145 mod grade steel

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

Similar Grades

SAE/AISI
4140 mod 18-22HRc
£492.09

Grades for Potential Substitution (Lesser)

BS 970
817M40 / EN24
£968.58
709M40 / EN19
£549.11
708M40
£503.61
European
42CrMo4
£514.99
41Cr4
£411.26
SAE/AISI
4140 mod 30-36HRc
£492.09

Grades for Potential Substitution (Greater)

SAE/AISI
4340
£1000.28
4330V
£1123.38
BS 970
826M40 / EN26
£1317.98

Services

Stock Availability

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