ASTM B850-98 (REAPPROVED 2009):
Partial list of hydrogen embrittlement-relief treatment bake times/temperatures for some common high-strength steels
| Tensile Strength (MPa) |
Tensile Strength (000 psi) |
Rockwell Hardness HRc |
Post-Plate Bake Time
@ 190° – 220° C. or 374° – 428° F. |
|
|
|||
|
1701 – 1800
|
247 – 261
|
49 – 51
|
Minimum 22 hours
|
|
1601 – 1700
|
232 – 247
|
47 – 49
|
Minimum 20 hours
|
|
1501 – 1600
|
218 – 232
|
45 – 47
|
Minimum 18 hours
|
|
1401 – 1500
|
203 – 218
|
43 – 45
|
Minimum 16 hours
|
|
1301 – 1400
|
189 – 203
|
39 – 43
|
Minimum 14 hours
|
|
1201 – 1300
|
174 – 189
|
36 – 39
|
Minimum 12 hours
|
|
1101 – 1200
|
160 – 174
|
33 – 36
|
Minimum 10 hours
|
|
1001 – 1100
|
145 – 160
|
31 – 33
|
Minimum 8 hours
|
|
|
|||
***The above strength-to-hardness comparison values are approximate only.
PER ASTM B850-98 (REAPPROVED 2009):
“The heat treatment does not guarantee complete freedom from the adverse effects of hydrogen degradation.”
There are several other types of steels (i.e unpeened items, alloys with a varying composition, types of coatings, chromium plated items etc…) and alloys which have varying temperature and/or bake times that can differ from the above chart. In those certain circumstances, Sonic Plating Co. Inc. may not be able to perform the necessary hydrogen-relief bake processes deemed appropriate. Please refer to the complete ASTM B850-98 (2009) standard to determine the bake process you may require.
Sonic Plating Co. Inc. assumes no liability in guaranteeing the complete and/or partial removal of hydrogen from any part(s) that we handle/treat. It is in the customer’s interest that his/her qualified engineering staff and/or designer(s), specify the required heat treatment on the part during the time of the original purchase order.