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| RECOMMENDED PREHEATING TEMPERATURES IN OC |
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| This chart is given as an indicative guide |
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Low-alloy Steel
↕
95 HRS - 30 HRC |
20
20-60
60 |
N
N
100 |
100
150
180 |
150
200
250 |
150
250
300 |
100
200
200 |
N
N
N |
N
N
N |
Tool Steel
↕
32 - 47 HRC |
20
20-60
60 |
N
N
125 |
100
125
180 |
180
250
300 |
200
250
350 |
100
200
250 |
N
L
N |
N
N
L |
12% Cr Steel
↕
32 - 51 HRC |
20
20-60
60 |
N
100
200 |
150
200
250 |
200
275
350 |
200
300
375 |
150
200
250 |
N
150
200 |
X
X
X |
Stainless Steel
↕
95 HRS |
20
20-60
60 |
N
N
N |
N
100
150 |
N
125
200 |
N
150
250 |
N
200
200 |
N
N
100 |
N
N
N |
Mn Steel
↕
20 HRC |
20
20-60
60 |
N
N
N |
N
N
N |
N
*100
*100 |
X
X
X |
X
X
X |
N
N
N |
N
N
N |
Co. based Gr. 6
↕
40 HRC |
20
20-60
60 |
100
300
400 |
200
400
400 |
250
*450
*500 |
200
400
*500 |
200
350
400 |
100
400
400 |
X
X
X |
Carbide type
↕
55 HRC |
20
20-60
60 |
N
N
NIL |
NIL
100
200 |
NL
200
250 |
NL
*200
*200 |
NL
*200
*200 |
NL
NL
NL |
NL
NL
NL |
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| N = Not necessary |
| L = Preheating when large areas are surfaced |
| X = This combination is not used |
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| More Info... |
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