4140 mod 18-22HRc
£248.59
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.
£274.84 per tonne
Surcharge Price History for 4145 mod
| AUG 18 | NOV 18 | FEB 19 | MAY 19 | TODAY |
|---|---|---|---|---|
| £357.11 | £358.48 | £331.79 | £326.29 | £274.84 |
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