The Difference Between Microalloy And Regular Alloy Steels

May 5, 2010

As machinists, we seldom encounter microalloy steels. but what do we need to know?

  1. Microalloy steel is manufactured like any other, but the chemical ingredients added at the initial  melt of the steel  to make it a microalloy include elements like Vanadium, Columbium (sorry, Niobium for us IUPAC  purists), Titanium, and higher amounts of Manganese and perhaps Molybdenum or Nickel.
  2. Vanadium, Columbium Niobium, and Titanium are also grain refiners and aggressive Oxygen scavengers, so these steels tend to also have a very fine austenitic grain size.
  3. In forgings, microalloy steels are able to develop higher mechanical properties (yield strengths greater than say 60,000 psi) and  higher toughness as forged by just cooling in air or with a  light mist water spray.
  4. Normal alloy steels  require a full austenitize, quench and temper heat treatment to develop properties greater than as rolled or cold worked.

Since microalloyed steels are able to get higher properties  using forging process heat- rather than an additional heating quenching tempering cycle- they can be less expensive to process to get improved mechanical properties.

 The developed microstructure ultimately makes the difference. The  microstructure developed in the steel depends on the grade and type.

Tempered martensite for normal alloys.

  • Normal alloy steels require a transformation to martensite  that is then tempered in order to achieve higher properties.

Bainite comparable hardness improved toughness.

  • Microalloy steel precipitates out various nitirides or carbides and may result in either a very fine ferrite- pearlite microstructure or may transform to bainite.

For machinists, if the steel is already at  its hardest condition, the microalloyed microstructure of either ferrite pearlite or bainite  is less abrasive than that of a fully quench and tempered alloy steel.

P.S. The non- martensitic structures also have higher toughness.

We don’t tend to machine prehardened steels in the precision machining industry, but if you ever are part of a team developing a process path for machining forgings, or finish cuts after induction hardening, these facts might be good to know.

Martensite.

Georges Basement Bainite 1000X

 

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