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US 8,709,123 B2Granted
Degassing of martensitic stainless steel before remelting beneath a layer of slag
AssigneeSnecma
InventorsLaurent Ferrer, Patrick Philipson
Life of this patent
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Abstract
The invention relates to a method of fabricating a stainless martensitic steel, comprising a step of electroslag remelting of an ingot of said steel then a step of cooling said ingot. Before the electroslag remelting step, the ingot undergoes vacuum degassing for a time that is sufficient to obtain a hydrogen content in the ingot of less than 3 ppm.
Claims12
A method of fabricating a stainless martensitic steel, the method comprising:
- vacuum degassing an ingot comprising a steel in a liquid metal state for a time sufficient to obtain a hydrogen content in the ingot of less than 3 ppm;
- then
- electroslag remelting the ingot;
- and then
- cooling the ingot.
2 more elements
The method ofclaim 1, further comprising, prior to the remelting:
- dehydrating the slag.
Dependencies are inferred from the claim text.