ASTM A291 Tempering Temperature
ASTM A291 Tempering Temperature
(OP)
Hello All:
ASTM A291 dictates the minimum tempering temperatures that shall be followed.
My questions
1. What is the reason for dictating the minimum tempering temperature ?
2. Can you go any lower on the tempering temperatures (when hardness is not achieved) and what are the risks in doing so.
Thanks for the help in advance.
ASTM A291 dictates the minimum tempering temperatures that shall be followed.
My questions
1. What is the reason for dictating the minimum tempering temperature ?
2. Can you go any lower on the tempering temperatures (when hardness is not achieved) and what are the risks in doing so.
Thanks for the help in advance.





RE: ASTM A291 Tempering Temperature
RE: ASTM A291 Tempering Temperature
I don't know what the minimum in A291 is, but many alloy steels have a range of intermediate temperatures that while they produce the expected strength they have very poor ductility. There are some specs that have been drafted to prevent people from falling into this range.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: ASTM A291 Tempering Temperature
And, as stated, if you use too low a tempering temperature, the material will lack the toughness and ductility required. Fix the problem, not the symptoms.
RE: ASTM A291 Tempering Temperature