Limit number of re-heating AISI 4140
Limit number of re-heating AISI 4140
(OP)
Dear Experts,
I'm interesting with the comment onthread330-311437, it was mention about the limit number for re quenching at 3, is there any specification or standard that said about it, I would be happy to have one.
My other concern is on the process of the re-heating AISI 4140 and I will practice on it, is there any standard for the dimension of testing sample?
many thanks in advance
ea
I'm interesting with the comment onthread330-311437, it was mention about the limit number for re quenching at 3, is there any specification or standard that said about it, I would be happy to have one.
My other concern is on the process of the re-heating AISI 4140 and I will practice on it, is there any standard for the dimension of testing sample?
many thanks in advance
ea





RE: Limit number of re-heating AISI 4140
As I was the one who made the comment, I'll explain. I hvae seen some specifications that limit the number of re-heat treatments. Of the few that I have seen that specify a limit, the limit is put at 3. Most specificaitons do not have a limit. All specifications I have seen that have a limit are proprietary and are covered by confidentially agreements.
My point was in response to the question of how many times can the material be re-heat treated. There is no definative answer to this question. In theory, there is no limit, but there are practical issues that need to be addressed in addition to the theory.
You can refer to ASTM A370 for standard test specimen sizes for the various tests that are commonly performed on heat treated steel. I am not sure what you are looking for when you ask There are standard tests and there are standard specimen sizes for those tests, as described in ASTM A370.
rp
RE: Limit number of re-heating AISI 4140
RE: Limit number of re-heating AISI 4140
Honestly,if even after 2 trials you are unable to get the properties,you need to relook at your material and process. Having a test bar spare,was always a challenge for me in such circumstances.
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Limit number of re-heating AISI 4140
basically, my problem is about the product of AISI 4140 which not reach the expected hardness and I believe that my previous heattreatment is not good, then I should have the proper one for it. My plan is do re-heating on the old product instead produce the new one since it will make the other cost for me. I don't have the experience about the re-heating before,but I will confidence to the "experiment" on re-heating the product from the information above.
best regards,
epan