Type of Part Tensile Strength (Equivalent Hardness)<br>or Hardness Stress Relief 5/(Before Plating) Embrittlement Relief (After Plating)<br> Temperature for Stress Relief Time for Baking Time for Baking<br>2/HRC 55 and over 275 °f ± 25 °f<br>3/5 hours minimum Shall not exceed 4 hours 275 ° F ± 25 ° F<br>4/23 hours minimum<br><br>All Other Parts 150 ksi and above (or HRC 33 and above) <br>375 °f ± 25 ° F 4 hours minimum Shall not exceed 4 hours <br>375 °f ± 25 °f 23 hours minimum<br> Below 150 KSI<br>(Below 33 HRC) No requirement No Requirement
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