Typology
Refractory steels and alloys - Production

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M3175 V1 Article

Typology


Refractory steels and alloys - Production

Author : Albert KOZLOWSKI

Publication date: June 10, 2010 | Lire en français

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1. Typology

The main types of refractory steels and alloys can be classified according to their metallographic structure as follows.

  • Martensitic or semi-ferritic steels

    • 5-10% Cr steels

      They generally have Si, Al, Mo and V additions. Strictly speaking, they are not stainless steels, but their use puts them in the category of refractory steels. In this category, we find 6% Cr steels, used for superheater tubes in thermal power plants (X8CrMoV6 steel), or to withstand hydrogen under pressure at high temperatures.

    • 9-10% Cr steels

      They are used for superheater tubes (X10CrMo9, X10CrMoVNb9).

    • 10-13% Cr steels

      They are...

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