Steel Pre-Heating Chart
Pre-heating can eliminate stresses in steel and eliminate or reduce the possibility of crack formation, heat distortion and shrinkage.
| Steel Groups |
Steel Designation |
% Carbon |
Preheat F |
Preheat C |
| Plain Carbon |
Plain Carbon |
Below 0.20 |
Up to 200 F |
Up to 93 C |
|
|
Plain Carbon |
0.20 to 0.30 |
200-300 F |
93-140 C |
|
|
Plain Carbon |
0.30 to 0.45 |
300-500 F |
149-250 C |
|
|
Plain Carbon |
0.45 to 0.80 |
500-800 F |
260-426 C |
| Carbon Moly |
Carbon moly |
0.10 to 0.20 |
300-500 F |
149-260 C |
|
|
Carbon moly |
0.20 to 0.30 |
400-600 F |
204-315 C |
|
|
Carbon moly |
0.30 to 0.35 |
500-800 F |
260-426 C |
|
|
Silicon structural |
0.35 |
300-500 F |
149-260 C |
|
|
Medium manganese |
0.20 to 0.25 |
300-500 F |
149-260 C |
| Manganese |
SAE T1330 |
0.30 |
400-600 F |
204-315 C |
|
|
SAE T1340 |
0.40 |
500-800 F |
260-426 C |
|
|
SAE T1350 |
0.50 |
600-900 F |
315-482 C |
|
|
12% Manganese |
1.25 |
Usually not |
required |
|
|
Manganese moly |
0.20 |
300-500 F |
149-260 C |
|
|
Manten |
0.30 max |
400-600 F |
204-315 C |
|
|
Armco high tensile |
0.12 max |
Up to 200 F |
Up to 93 C |
| High Tensile |
Mayari R |
0.12 max |
Up to 300 F |
Up to 149 C |
|
|
Nax high tensile |
0.15 to 0.25 |
Up to 300 F |
Up to 93 C |
|
|
Cromansil |
0.14 max |
300-400 F |
149-204 C |
|
|
Corten |
0.12 max |
200-400 F |
93-204 C |
|
|
Yolloy |
0.05 to 0.35 |
200-600 F |
93-315 C |
| Nickel |
SAE 2015 |
0.10 to 0.20 |
Up to 300 F |
Up to 149 C |
|
|
SAE 2115 |
0.10 to 0.20 |
200-300 F |
93-149 C |
|
|
SAE 2315, 2320 |
0.15 to 0.20 |
200-500 F |
93-260 C |
|
|
SAE 2330, 2340 |
0.30 to 0.40 |
400-600 F |
204-315 C |
| Medium Nickel Chromium |
SAE 3115, 3125 |
0.15 to 0.25 |
300-400 F |
149-204 C |
|
|
SAE 3130, 3140 |
0.30 to 0.40 |
500-700 F |
260-371 C |
|
|
SAE 3150 |
0.50 |
600-900 F |
315-482 C |
|
|
SAE 3215, 3230 |
0.15 to 0.30 |
400-600 F |
204-315 C |
|
|
SAE 3240, 3250 |
0.40 to 0.50 |
800-1000 F |
426-529 C |
|
|
SAE 3315 |
0.15 |
500-700 F |
260-371 C |
|
|
SAE 3325, 3425, 3450 |
0.25 to 0.50 |
900-1100 F |
482-593 C |
| Moly Bearing Chromium/ Chromium Nickel |
SAE 4140 |
0.40 |
600-800 F |
315-426 C |
|
|
SAE 4340 |
0.40 |
700-900 F |
371-482 C |
|
|
SAE 4615 |
0.15 |
400-600 F |
204-315 C |
|
|
SAE 4630 |
0.30 |
500-700 F |
260-371 C |
|
|
SAE 4640, 4920 |
0.40 to 0.20 |
600-800 F |
315-426 C |
|
|
2% chrome/.5% moly |
Up to 0.15 |
400-600 F |
204-315 C |
|
|
2% chrome/.5% moly |
0.15 to 0.25 |
500-800 F |
260-426 C |
| Low Chrome moly |
2% chrome/1% moly |
Up to 0.15 |
500-700 F |
260-371 C |
|
|
2% chrome/1% moly |
0.15 to 0.25 |
600-800 F |
315-426 C |
|
|
5% chrome/.5% moly |
Up to 0.15 |
500-800 F |
260-426 C |
| Medium Chrome moly |
5% chrome/.5% moly |
015 to 0.25 |
600-900 F |
315-482 C |
|
|
8% chrome/1% moly |
0.15 max |
600-900 F |
315-482 C |
| Plain High Chromium |
12-14% chrome/AISI type 410 |
0.10 |
300-500 F |
149-260 C |
|
|
16-18% chrome/AISI type 430 |
0.10 |
300-500 F |
149-260 C |
|
|
23-30% chrome/AISI type 446 |
0.10 |
300-500 F |
149-260 C |
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