Method for producing a low-alloy steel ingot

Patent metadata

Field	Value
Publication number	US-11560612-B2
Application number	US-201916450219-A
Country	US
Kind code	B2
Filing date	Jun 24, 2019
Priority date	Jun 10, 2014
Publication date	Jan 24, 2023
Grant date	Jan 24, 2023

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 part made of low alloy steel comprising iron and carbon, the part extending along a longitudinal axis, the part being such that when evaluated using the D method of the ASTM E 45-10 standard, the following results are obtained for analysis along the longitudinal axis:
the number of fields including type D inclusions of severity level equal to 0.5 is less than 5;
no field including type D inclusions of severity level equal to 1 is obtained; and
no field including type B inclusions of severity level equal to 0.5 is obtained,

wherein the part is fabricated by solidifying a melt pool comprising iron and carbon such that a mean solidification speed of the melt pool is less than or equal to 45 micrometers per second.

2. A part according to claim 1 , wherein when the part is evaluated using the method D of the ASTM E 45-10 standard, the following result is obtained when summing three measurement results obtained along the longitudinal axis of the part and along two axes perpendicular to the longitudinal axis:
the total number of fields including type D inclusions of severity level equal to 0.5 is less than or equal to 15.

3. A part according to claim 1 , wherein carbon is present at a content by weight lying in the range 0.09% to 1.00%.

4. A part according to claim 1 , further comprising chromium at a content by weight lying in the range 0.05% to 5.00%.

5. A part according to claim 1 , further comprising molybdenum at a content by weight less than or equal to 5.00%.

6. A part according to claim 1 , comprising 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 5.00%;
nickel at a content by weight less than or equal to 5.00%;
silicon at a content by weight less than or equal to 3.00%;
chromium at a content by weight lying in the range 0.05% to 5.00%;
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%.

Assignees

• Safran Aircraft Engines
• Safran Landing Systems

Inventors

• Ferrer Laurent
• Binot Nicolas

Classifications

• C22C38/02

  containing silicon · CPC title

• B22D27/02

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

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• B22D27/04

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

• C22C38/46

  with vanadium · CPC title