Summary for 2024 t351 temper Discussion
2024 T351 asks what the temper designation means and whether machining changes the temper or allows re-heat treatment. Ted Mooney points readers to the general idea that the designation is about the alloy’s temper rather than a simple property list. James Vincent Meiselbach explains that T3 means the alloy was solution heat treated and then cold worked, and that the “51” means stress relief by stretching the material about 0.50 to 3% depending on shape. In other words, T351 is a solution heat-treated, cold-worked, and stress-relieved condition. The thread also includes a later request for detailed heat-treatment temperatures and times for 2024 T351, but no process schedule is provided in the excerpt. The practical takeaway is that machining may remove material but does not itself define the temper, and any re-heat treatment question would need engineering or heat-treat data specific to the part and specification.
Q. I would like to know what the T351 stands for in 2024 T351. I am doing an independent lab on heat treating aluminum and need to know all of the material properties of the samples I will be using. I am using aluminum 2024 T351.
Jack Rickey
student – Vancouver, Washington, USA
2004
 | A. The T351 is called a temper designation and it indicates the following: T3 means solution heat treated, cold worked, and naturally aged to a substantially stable condition. Tx51 (of which T351 is one example) is an additional designation used specifically for plate, rolled or cold-finished bar, die or ring forgings, or rolled rings that have been stress relieved by stretching. Typical values of permanent set after stretching are Toby Padfield A. Look up material properties at www.matweb.com David A. Kraft |
? Matweb is undoubtedly helpful for a lot of things, David, and it gave some properties common to 2024 T4 and 2024 T351, but I spent 10 minutes without actually making progress towards the answer to this question of what T351 means. Do you have a particular page or search method you suggest?
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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Q. 2024-T351 Aluminum, is there a loss of temper in the machining process and if so can the part be re-heat treated to T351.
Thanks,
Bill Shook
– Heath, Ohio
2006
A. T3 is a solution heat treatment and then cold worked. This applies to items that are cold worked, straightened or flattened to improve strength. The “51” is the stress relief after heat treatment. This is done by stretching the item anywhere from 0.50 to 3 percent it extended length, depending on its shape. Hope this helps.
James Vincent Meiselbach, Mech. Eng.
– Irvine, California
2007
Q. My name is Bill Montgomery from Little Rock, Ar.
I am interested in finding out if there is a major difference between 2024-T3, T350, T351, T3511. The company I work for is questioning the mat’l if it doesn’t match the required callout & before I submit my request for suitable substitutions I would like to know the difference in the callouts. I have read the previous questions but I’m looking for something to take to engineering.
Thank you.
Bill Montgomery
CNC programmer – Little Rock, Arkansas
January 18, 2008
“Alcoa Aluminum Handbook
Aluminum: its forms, alloys, and tempers”
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Q. Hi All,
Please inform Aluminum 2024 T351 Heat treatment following process temperatures & time for electric furnace.
Annealing process time & temperature
Quenching – media & time
?
Age Hardening – Natural
Very Best regards
Neil Mayadunna
Shop Employee – Sri Lanka
August 12, 2024