Method for producing a low-alloy steel ingot

Patent metadata

Field	Value
Publication number	US-10364479-B2
Application number	US-201515317508-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Jun 10, 2014
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

A method of fabricating a low alloy steel ingot, the method including a) melting all or part of an electrode by a vacuum arc remelting method, the electrode, before melting, including iron and carbon, the melted portion of the electrode being collected in a crucible, thus forming a melt pool within the crucible; and b) solidifying the melt pool by heat exchange between the melt pool and a cooling fluid, the heat exchange applied serving to impose a mean solidification speed during step b) that is less than or equal to 45 μm/s and to obtain an ingot of low alloy steel.

First claim

The invention claimed is:

1. A method of fabricating a low alloy steel ingot, the method comprising:
a) melting all or part of an electrode by a vacuum arc remelting method, the electrode, before melting, comprising iron and carbon, the melted portion of the electrode being collected in a crucible thus forming a melt pool within the crucible; and
b) solidifying the melt pool by heat exchange between the melt pool and a cooling fluid, the heat exchange applied serving to impose a mean solidification speed during step b) that is less than or equal to 45 μm/s and to obtain an ingot of low alloy steel.

2. A method according to claim 1 , wherein carbon is present in the electrode before melting at a content by weight lying in the range 0.09% to 1.00%.

3. A method according to claim 1 , wherein the electrode also includes, prior to melting, chromium at a content by weight lying in the range 0.10% to 5.50%.

4. A method according to claim 1 , wherein the electrode also includes, prior to melting, molybdenum at a content by weight less than or equal to 5.00%.

5. A method according to claim 1 , wherein, prior to melting, the electrode comprises iron together with:
carbon at a content by weight lying in the range 0.09% to 1.00%;
manganese at a content by weight less than or equal to 6.00%;
nickel at a content by weight less than or equal to 5.50%;
silicon at a content by weight less than or equal to 3.00%;
chromium at a content by weight lying in the range 0.10% to 5.50%;
molybdenum at a content by weight less than or equal to 5.00%; and
vanadium at a content by weight less than or equal to 5.00%.

6. A method according to claim 1 , wherein a diameter of the melt pool lies in the range 650 mm to 1200 mm.

7. A method according to claim 1 , wherein, before melting, the electrode is cylindrical in shape.

8. A method according to claim 1 , wherein the mean solidification speed of the melt pool imposed during step b) is less than or equal to 40 μm/s.

9. A method according to claim 1 , wherein the mean solidification speed imposed during step b) is greater than or equal to 9 μm/s.

Assignees

• Safran Aircraft Engines
• Safran Landing Systems

Inventors

• Ferrer Laurent
• Binot Nicolas

Classifications

• B22D27/04

  Influencing the temperature of the metal, e.g. by heating or cooling the mould · CPC title

• C22B9/04

  Refining by applying a vacuum · CPC title

• C22C38/02

  containing silicon · CPC title

• B22D27/02

  Use of electric or magnetic effects {(for continuous casting B22D11/015, B22D11/11)} · CPC title

• C22C38/04

  containing manganese · CPC title