A508 · 22 Class3
For A508, class or grade is 22 Class3; esab preheat group is C; esab-recommended smaw (stick) filler is AA 9018-CM; esab-recommended gmaw/gtaw filler is ER90S-B3; suggested preheat by thickness, low hydrogen (h8 and less) — the a-d column for this grade's preheat group is T < .75: 200, .75 < T < 1.5: 300, 1.5 < T < 2.5: 300, T > 2.5: 350, recorded from its source on 2026-08-31.
- ASTM specification
- A508 verified
- Class or grade
- 22 Class3 verified
- ESAB preheat group
- C verified
- ESAB-recommended SMAW (stick) filler
- AA 9018-CM verified
- ESAB-recommended GMAW/GTAW filler
- ER90S-B3 verified
- Suggested preheat by thickness, low hydrogen (H8 and less) — the A-D column for this grade's preheat group
- T < .75: 200, .75 < T < 1.5: 300, 1.5 < T < 2.5: 300, T > 2.5: 350 our reading
- Suggested preheat by thickness, hydrogen above H8 — the A-D column for this grade's preheat group
- T < .75: NR, .75 < T < 1.5: NR, 1.5 < T < 2.5: NR, T > 2.5: NR 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 2 Class 2, 3 Class 2 A AA 9018-SR 4N Class 1, 5 Class 1 B AA T 22 Class3 C AA 9018-CM ER90S-B3
— 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 by thickness, low hydrogen (H8 and less) — the A-D column for this grade's preheat group and Suggested preheat by thickness, hydrogen above H8 — the A-D column for this grade's preheat group
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