A508 · 2 Class 1, 3 Class 1
For A508 · 2 Class 1, 3 Class 1, astm specification is A508; class or grade is 2 Class 1, 3 Class 1; esab preheat group is A; esab-recommended smaw (stick) filler is AA 8018-NM; suggested preheat, low hydrogen (h8 and less), by thickness is T < .75: 70, .75 < T < 1.5: 70, 1.5 < T < 2.5: 150, T > 2.5: 225, recorded from its source on 2026-08-31.
- ASTM specification
- A508 verified
- Class or grade
- 2 Class 1, 3 Class 1 verified
- ESAB preheat group
- A verified
- ESAB-recommended SMAW (stick) filler
- AA 8018-NM verified
- Suggested preheat, low hydrogen (H8 and less), by thickness
- T < .75: 70, .75 < T < 1.5: 70, 1.5 < T < 2.5: 150, T > 2.5: 225 our reading
- Suggested preheat, hydrogen above H8, by thickness
- T < .75: 175, .75 < T < 1.5: 225, 1.5 < T < 2.5: 275, T > 2.5: 300 our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
A508 1, 1A A AA 7018-SR Group 1 2 Class 1, 3 Class 1 A AA 8018-NM
— assets.esab.com, retrieved 2026-08-31
Where each value comes from
The values above are stated away from the sentence quoted with the answer, so the passage that states them is shown here too.
Suggested preheat, low hydrogen (H8 and less), by thickness and Suggested preheat, hydrogen above H8, by thickness
Preheat A B C D Low Hydrogen H8 and less T < .75 70 70 200 300 .75 < T < 1.5 70 125 300 400 1.5 < T < 2.5 150 200 300 400 T > 2.5 225 300 350 500 Hydrogen > H8 T < .75 175 175 NR NR .75 < T < 1.5 225 225 NR NR 1.5 < T < 2.5 275 275 NR NR T > 2.5 300 300 NR NR
— all from assets.esab.com, retrieved 2026-08-31
Source
- assets.esab.comhttps://assets.esab.com/assetbank-esab/assetfile/22174.pdf