# Specify acceptable heat treatments for 17-4PH steel parts

**URL:** <https://opensourceleg.discourse.group/t/specify-acceptable-heat-treatments-for-17-4ph-steel-parts/33>\
**Category:** Hardware\
**Created:** [August 26, 2025, 12:40pm UTC](https://opensourceleg.discourse.group/t/specify-acceptable-heat-treatments-for-17-4ph-steel-parts/33 "2025-08-26T12:40:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Troy](https://avatars.discourse-cdn.com/v4/letter/t/85f322/32.png) [@Troy](https://opensourceleg.discourse.group/u/Troy)\
**Post date:** [August 26, 2025, 12:40pm UTC](https://opensourceleg.discourse.group/t/specify-acceptable-heat-treatments-for-17-4ph-steel-parts/33/1 "2025-08-26T12:40:08Z")

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Please specify acceptable heat treatments for the 17-4PH steel parts.

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**Author:** ![jmcaputo](https://avatars.discourse-cdn.com/v4/letter/j/7ab992/32.png) [@jmcaputo](https://opensourceleg.discourse.group/u/jmcaputo)\
**Post date:** [August 28, 2025, 6:02pm UTC](https://opensourceleg.discourse.group/t/specify-acceptable-heat-treatments-for-17-4ph-steel-parts/33/2 "2025-08-28T18:02:46Z")

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After some further analysis on this at at Humotech, we’ve determined H900 is necessary for some/all of the OSL parts. Other common variations of 17-4PH such as H1150D have yield stresses significantly lower than necessary.

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**Author:** ![jmcaputo](https://avatars.discourse-cdn.com/v4/letter/j/7ab992/32.png) [@jmcaputo](https://opensourceleg.discourse.group/u/jmcaputo)\
**Post date:** [August 28, 2025, 6:03pm UTC](https://opensourceleg.discourse.group/t/specify-acceptable-heat-treatments-for-17-4ph-steel-parts/33/3 "2025-08-28T18:03:33Z")

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Recommended guide to the different sub-types of 17-4PH: [https://www.rolledalloys.com/wp-content/uploads/17-4\_Data-sheet-rolled-alloys.pdf](https://www.rolledalloys.com/wp-content/uploads/17-4_Data-sheet-rolled-alloys.pdf)