SAE AMS6532K-2024 - Steel, Bars and Forgings, and Forging Stock 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.23 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable

Standard No.: SAE AMS6532K-2024
Release Date: 2024
Published By: Society of Automotive Engineers (SAE)
Status: Be replaced
Replace By: SAE AMS6532L-2024
Latest: SAE AMS6532L-2024

Introduction

Technical Evolution of AMS6532K Standard

The revised version of AMS6532K released in January 2024 makes important technical adjustments for alloy steels of type UNS K92580:

Revision Dimensions AMS6532J AMS6532K

Carbon Content Range 0.23-0.25% Precisely limited to 0.23-0.25%

Aging Time Unspecified Minimum aging time of 16 hours

Metallurgy control General requirements The range of electrolytic iron, sulfur and phosphorus needs CEO approval

Core material property requirements

Chemical composition control

The alloy adopts double vacuum melting process (VIM+VAR), key elements control:

Cobalt (Co): 13.00-14.00% to improve high temperature stability

Nickel (Ni): 11.00-12.00% to ensure austenite transformation

Molybdenum (Mo): 1.10-1.30% to strengthen the precipitation phase

Mechanical properties benchmark

Typical Aviation Application Case

A certain landing gear forging is made of AMS6532K material. After aging at 900°F, it achieves the following:

Tensile strength: ≥280 ksi (1931 MPa)

Fracture toughness: KIC≥100 ksi√in

Grain size: ASTM No.8

Implementation Recommendations

Aging temperature selection (875°F or 900°F) should be specified during procurement

For variable cross-section forgings, 890°F±10°F graded aging is recommended

The amount of rare earth elements added needs to be recorded during the melting process

Revision Dimensions	AMS6532J	AMS6532K
Carbon Content Range	0.23-0.25%	Precisely limited to 0.23-0.25%
Aging Time	Unspecified	Minimum aging time of 16 hours
Metallurgy control	General requirements	The range of electrolytic iron, sulfur and phosphorus needs CEO approval

SAE AMS6532K-2024 Referenced Document

AS 1182 Infant and child clothing sizing coding scheme for underwear and outerwear*， 2025-08-20 Update
ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A604 Standard Test Method for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets
ASTM A751 Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
ASTM E1077 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
ASTM E112 Standard Test Methods for Determining Average Grain Size
ASTM E140 Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, and Scleroscope Hardness
ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
ASTM E45 Standard Test Methods for Determining the Inclusion Content of Steel

SAE AMS6532K-2024 history
2024 SAE AMS6532L-2024 Steel, Bars and Forgings, and Forging Stock 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable
2024 SAE AMS6532K-2024 Steel, Bars and Forgings, and Forging Stock 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.23 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable
2022 SAE AMS6532J-2022 Steel, Bars and Forgings, and Forging Stock 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable
2018 SAE AMS6532H-2018 Steel, Bars and Forgings 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable
2018 SAE AMS6532G-2018 Steel@ Bars and Forgings 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted@ Normalized and Overaged Precipitation Hardenable (UNS K92580)
2014 SAE AMS6532F-2014 Steel, Bars and Forgings, 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted, Normalized and Overaged, Precipitation Hardenable
2011 SAE AMS6532E-2011 Steel, Bars and Forgings 3.1Cr 11.5Ni 13.5Co 1.2Mo (0.21 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable
2006 SAE AMS6532D-2006 Steel, Bars and Forgings 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable UNS K92580
2005 SAE AMS6532C-2005 Steel@ Bars and Forgings 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted@ Normalized and Overaged Precipitation Hardenable (UNS K92580)
2001 SAE AMS6532B-2001 Steel, Bars and Forgings 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted, Annealed Heat Treatable to 280 ksi (1931 MPa) Tensile Strength UNS K92580
1995 SAE AMS6532A-1995 Steel Bars and Forgings 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.21 - 0.25C) Vacuum Melted@ Annealed (UNS K92580)

SAE AMS6532K-2024Steel, Bars and Forgings, and Forging Stock 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.23 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable

Technical Evolution of AMS6532K Standard

Core material property requirements

Chemical composition control

Mechanical properties benchmark

Typical Aviation Application Case

Implementation Recommendations

SAE AMS6532K-2024 Referenced Document

SAE AMS6532K-2024 history

Standard and Specification

SAE AMS6532K-2024
Steel, Bars and Forgings, and Forging Stock 3.1Cr - 11.5Ni - 13.5Co - 1.2Mo (0.23 - 0.25C) Vacuum Melted, Normalized and Overaged Precipitation Hardenable