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Welding preheat chart: for welding materials

Common welding material drying temperature and retention time

Type Note Low temperature steel welding rod. Time
( H )
Carbon steel and low alloy steel welding rod. J422 150 I
J426 300 1
J427 350 1
J502 150 1
J506
J507
350 1
J506RH
J507RH
350~430 I
J507MoW 350 1
J557 350 1
J556RH 400 I
J606
J607
350 1
J607RH 350~430 1
J707 350 1
J707RH 400 two
Low temperature steel welding rod. W607
W707
350 1
Molybdenum Chromoly Heat Resistant Steel Welding Rod R207
R307
350 I
R307H 400 1
R317
R407
R507
350 1
Chrome Nickel Stainless Steel Welding Rod A102 150 1
A107 250 1
A132 150 1
A137 250 1
A202 150 1
A207 250 I
A002
A022
A212
A242
150 1

Recommended preheat temperature for common steel grades

Steel Grade Thickness
( mm )
Preheating temperature,
(℃)
20G
20
20R
20g
30~50 ≥50
>50~100 ≥100
100 ≥150
16MnD
09MnNiD16MnDR
09MnNiDR15MnNiDR
≥30 ≥50
16 minutes
16MnR15MnVR
15MnNbR
30~50 ≥100
>50 ≥150
20MnMo
20MnMoD
08MnNiCrMoVD
Any thickness ≥100
07MnCrMoVR
07MnNiCrMoVDR
16~30 ≥60
>30~40 ≥80
>40~50 ≥100
13MnNiMoNbR Any thickness ≥150
18MnMoNbR ≥180
20MnMoNb Any thickness ≥200
12CrMo
15CrMo12CrMoG
15CrMoR15CrMoG
>10 ≥150
12CrlMoV
12CrlMoVG
14CrlMoR
14CrlMo
12Cr2Mo
12Cr2M01
12Cr2MoG
12Cr2M01R
>6 ≥200
1Cr5Mo Any thickness ≥250

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