IP Library › Granted Patent US 12,338,502
Granted Patent B2
US 12,338,502 · App. 18/484,657 · Granted Jun 24, 2025

Ultra-high strength alloy

Inventor: Paul M. Novotny (Mohnton, PA)
Assignee: CRS HOLDINGS, LLC
C21D6/008C21D6/004C21D6/005C21D6/007C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/52
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Quick Facts
Patent No.
US 12,338,502
App. No.
18/484,657
Granted
Jun 24, 2025
Kind
B2
Abstract

A steel alloy having very high strength in combination with good ductility, impact toughness, and fracture toughness is disclosed. The alloy has the following weight percent composition. C 0.30-0.46 Mn 0.04 max. Si 0.03 max. P 0.003 max. S 0.0010 max. Cr 1.65-2.90 Ni 10.5-13.0 Mo 1.2-3.4 Co 15.4-18.6 Al 0.01 max. Ti 0.02 max. O 0.0010 max. N 0.0010 max. The balance is iron and usual impurities.

Claims (31)

1. A steel alloy consisting essentially of, in weight percent:

C

0.32-0.40

Mn

 0.04 max.

Si

not more than about 0.03

P

 0.003 max.

S

0.0010 max.

Cr

1.7 to not more than about 2.0

Ni

10.5-13  

Mo

2.2-2.4

Co

16-18

Al

 0.01 max.

Ti

 0.02 max.

O

0.0010 max.

N

0.0010 max.

one or both of Ce up to 0.01% and La up to 0.04%, wherein the ratio Ce/S or La/S is 4 to 20; and

the balance of the alloy is iron and usual impurities.

2. The steel alloy as claimed in claim 1 , wherein nickel is 11 to 13%.

3. The steel alloy as claimed in claim 2 , wherein nickel is 11 to 12%.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 9, 2025
From: NOVOTNY, PAUL M.
To: CRS HOLDINGS, INC.
Reel/Frame 071248/0248 →
CHANGE OF NAME Recorded May 9, 2025
From: CRS HOLDINGS, INC.
To: CRS HOLDINGS, LLC
Reel/Frame 071248/0263 →
Continuity (3)
Continuation 16857413 · Apr 24, 2020
Provisional Application 62839189 · Apr 26, 2019
Related Publication 20240271237A1 · Aug 15, 2024
References Cited (12)
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W.M. Garrison Jr. et al., “An Evaluation of an Ultra-High Strength Steel Strengthened by Alloy Carbide and Intermetallic Precipitates,” Trans. Indian Inst. Met., vol. 49 No. 3, Jun. 1996, pp. 151-162. [cited by applicant]
M. Grujicic, “Thermodynamics Aided Design of High Co—Ni Secondary Hardening Steels,” CALPHAD vol. 14 No. 1, 1990, pp. 49-59. [cited by applicant]
K.J. Handerhan et al., “A Comparison of the Fracture Behavior of Two Heats of the Secondary Hardening Steel AF1410,” Metallurgical Transactions vol. 20A, Jan. 1989, pp. 105-123. [cited by applicant]