Hard Chrome and fatigue
Hard Chrome and fatigue
(OP)
I need some wisdom.
I have a part that is 17-4 H900 stainless steal that was hard chrome coated, and electro-polished. The problem is that they coated my threads too. I have removed the chrome from the threads but I am trying to determine if there is residual degradation of my part fatigue life from the chroming?
The threads were not supposed to be coated, they screwed up! The company that did it states that there is no residual effects... but I know chroming can decrease endurance by as much as 50%. Did the chrome removal restore my endurance? If not how much did it decrease (%)?
Thanks
I have a part that is 17-4 H900 stainless steal that was hard chrome coated, and electro-polished. The problem is that they coated my threads too. I have removed the chrome from the threads but I am trying to determine if there is residual degradation of my part fatigue life from the chroming?
The threads were not supposed to be coated, they screwed up! The company that did it states that there is no residual effects... but I know chroming can decrease endurance by as much as 50%. Did the chrome removal restore my endurance? If not how much did it decrease (%)?
Thanks





RE: Hard Chrome and fatigue
RE: Hard Chrome and fatigue
17-4PH in an H900 cond. is susceptible to hydrogen embrittlement as a result of electroplating processes. As long as your parts were processed carefully, including hydrogen embrittlement relief treatment, there should be no detrimental effect on fatigue properties.
You can refer to AMS2759/9 for more details on hydrogen embrittlement relief.
Hope that helps.
Terry
RE: Hard Chrome and fatigue
RE: Hard Chrome and fatigue
Maui
www.EngineeringMetallurgy.com