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Hi israelkk, Sorry for the late response duo to I tried to find AR-MMPDS-01. I did check the values you mentioned (like Ftu, Fty..). It contains much information about 17-4PH (also other materials). Thank you for giving this instruction. cys

Hi mfgenggear, Yes, I did appreciate to get a lot of good and practical knowledge in this forum :). To work with 17-4PH is not that popular in the location I live. Especially to obtain the material (maybe cause I only need few kilos). I also agree with you it's about if the shops are aggressive...

Hi EdStainless, Thank you for the response. I did see the hold time are all 4 hours above H1025 and there are even H1150+1150 or H1150-M above H1150 only. Thanks for the H1000/H1025 suggestion. That's really what I never read on HT texts or handbooks... cys

Hi redpicker, Yes, most texts I read indicate 4h hold time for H1025. Probably only one says 1 hour. I believe 4 is correct. Thanks for explaining the difference before and after aging. Combining those advices I believe to machine parts after aging is preferable choice. I recall a similar...

Thanks btrueblood for the response. Actually it's AK steel's data sheet to give me the idea of 4 hours. With your suggestion I am more confident about this number. :) Thank you. cys

Dear Friends, Sorry I have to again bother you about the 17-4PH. 1. I have found a supplier of 17-4PH (actually SUS630 instead) with solution treated. However the supplier told me that it's hardness is about 380 HB? It's almost 41HRc and actually harder than H1025 aging... I read from the text...

Dear Friends, First to all I would apologize for the late response. I am sorry for asking this simple question... I did try to study this by reading some heat treatment texts and data sheets from material manufacturing companies. But all of them simply describing solution and/or aging...

Hi friends, I have a part which it's material is 17-4PH ss and H1025 condition is requested. I know after H1025 the hardness might up to 38HRc. So I have to leave it the last step. I have 2 questions below : 1. Is it a necessary step to apply solution condition A before H1025? What might...