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RECOMMENDED PREHEATING TEMPERATURES IN OC
 
This chart is given as an indicative guide
 
Base Material Filler material Plate thickness (mm) Steel<90 HRB Low alloy
95 HRB- 30 HRC
Tool steel 30-43 HRC Cr-steel
5-12% Cr
32-51 HRC
Cr-steel >12% Cr
95 HRB-
30 HRC
Stainless steel -96 HRB 14% Mnsteel
25-51 HRC
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
 
N = Not necessary
L = Preheating when large areas are surfaced
X = This combination is not used
 
 
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