POST WELD HEAT TRAT CHART
Controlling
Thickness
(inches)
Max Heat Rate
(F / Hour)
Min Time
800F to 1100F
* Min Hold Time
@ 1100F
Max Cool Rate
1100F to 800F
(F / Hour)
Min Time
1100F to 800F
0.250”
400
45 min
15 min
500
36 min
0.375”
400
45 min
23 min
500
36 min
0.500”
400
45 min
30 min
500
36 min
0.625”
400
45 min
38 min
500
36 min
0.750”
400
45 min
45 min
500
36 min
0.875”
400
45 min
53 min
500
36 min
1.000”
400
45 min
1 hr
500
36 min
1.125”
356
51 min
1 hr – 8 min
445
41 min
1.250”
320
57 min
1 hr – 15 min
400
45 min
1.375”
291
1 hr – 2 min
1 hr – 23 min
364
50 min
1.500”
267
1 hr – 8 min
1 hr – 30 min
334
54 min
1.625”
247
1 hr – 14 min
1 hr – 38 min
308
59 min
1.750”
229
1 hr – 19 min
1 hr – 45 min
286
1 hr – 3 min
1.875”
214
1 hr – 25 min
1 hr – 53 min
267
1 hr – 8 min
2.000”
200
1 hr – 30 min
2 hr
250
1 hr – 12 min
2.250”
178
1 hr – 42 min
2 hr – 4 min
223
1 hr – 21 min
2.500”
160
1 hr – 53 min
2 hr – 8 min
200
1 hr – 30 min
2.750”
146
2 hr – 4 min
2 hr – 12 min
182
1 hr – 39 min
3.000”
134
2 hr – 15 min
2 hr – 15 min
167
1 hr – 48 min
3.250”
123
2 hr – 27 min
2 hr – 19 min
154
1 hr – 57 min
3.500”
115
2 hr – 38 min
2 hr – 23 min
143
2 hr – 6 min
3.750”
107
2 hr – 49 min
2 hr – 27 min
134
2 hr – 15 min
4.000”
100
3 hr
2 hr – 30 min
125
2 hr – 24 min
4.250”
100
3 hr
2 hr – 34 min
118
2 hr – 33 min
4.500”
100
3 hr
2 hr – 38 min
112
2 hr – 42 min
4.750”
100
3 hr
2 hr – 42 min
106
2 hr – 51 min
5.000”
100
3 hr
2 hr – 45 min
100
3 hr
Over 5.000”
100
3 hr
3 hr
100
3 hr
* Above values
per UCS-56
This chart is applicable to P-1 and P-3 materials only. Minimum time from 800F to 1100F, or from 1100F to 800F,
must be as shown in order to comply with ASME Section VIII, Division 1 Code. Also, the holding temperature shall not
be less than 1100F for the time shown. Normal heat treating tolerance is  25F, therefore for materials pertinent to
this chart the specified range for the holding temperature shall be 1125F  25F.