Ferritic stainless steel with improved machinability
AssigneeUgine Savoie (Societe Anonyme)
InventorsPierre Pedarre, Pascal Terrien
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Abstract
Ferritic stainless steel with improved machinability, which can be used especially in the field of screw machining, characterized by the following composition: C<0.17% Si<2.0% Mn<2.0% Cr[11-20] % Ni<1.0% S.ltoreq.0.55% Ca>30.times.10.sup.-4 % O>70.times.10.sup.-4 % the Ca/O ratio, between the calcium content and the oxygen content, being given by 0.2<Ca/O<0.6, the said steel being subjected, after rolling and cooling, to an annealing heat treatment giving it a ferritic structure.
Claims8
Stainless steel of ferritic structure and with improved machinability which can be used, especially, in the field of screw-machining, which includes, in its composition:
- C.ltoreq.0.17%
- Si.ltoreq.2.0%
- Mn`2.0%
- Cr [11-20] %
- Ni<1%
- S.gtoreq.0.55%
- Ca.gtoreq.30.times.10.sup.-4 %
- O.gtoreq.70.times.10.sup.-4 %
- the Ca/O ratio, between the calcium content and the oxygen content, being given by 0.2.ltoreq.Ca/O.ltoreq.0.6.
Dependencies are inferred from the claim text.