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4340 - 2% Nickel-Molybdenum-Chromium-Vanadium 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
£567.84 per tonne

Surcharge Price History for 4340

APR 18 JUL 18 OCT 18 JAN 19 TODAY
£467.15 £617.01 £595.38 £618.36 £567.84

Description

4340 grade steel is a through hardening steel which in the quenched and tempering condition is capable of high strengths.

Its hardenability is excellent, allowing large section sizes to be heat treated with maintained through hardness.

While 4340 is normally oil quenched, due to the high hardenability, small sections may be air hardened.

4340 has good ductility allowing for hot forming operations to be carried out in the annealed condition.

This grade is not considered weldable by standard methods but it can be welded by more sophisticated methods such as EBW. Pre-heating and post-weld heat treatment is desirable to prevent cracking and compromised mechanical properties.

4340 is also suitable for nitriding which will result in improved fatigue strength.

Typical applications of 4340 grade steel

  • Mandrel hanger bodies
  • Connectors
  • Drilling riser bolting
  • Nuts
  • Inserts
  • Tools

 

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PRODUCTION METHOD

Rolled or Forged

FINISHES

Black Bar or Bright Bar