A671 · CF 66, CF 71
For A671, class or grade is CF 66, CF 71; esab preheat group is B; esab-recommended smaw (stick) filler is AA 8018-N; esab-recommended fcaw (gas-shielded flux-cored) filler is DS 9000-C1; suggested preheat by thickness, low hydrogen (h8 and less) — the a-d column for this grade's preheat group is T < .75: 70, .75 < T < 1.5: 125, 1.5 < T < 2.5: 200, T > 2.5: 300, recorded from its source on 2026-09-16.
- ASTM specification
- A671 verified
- Class or grade
- CF 66, CF 71 verified
- ESAB preheat group
- B verified
- ESAB-recommended SMAW (stick) filler
- AA 8018-N verified
- ESAB-recommended FCAW (gas-shielded flux-cored) filler
- DS 9000-C1 verified
- Suggested preheat by thickness, low hydrogen (H8 and less) — the A-D column for this grade's preheat group
- T < .75: 70, .75 < T < 1.5: 125, 1.5 < T < 2.5: 200, T > 2.5: 300 our reading
- Suggested preheat by thickness, hydrogen above H8 — the A-D column for this grade's preheat group
- 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
A671 CA 55, CB 60, CB 65, CB 70 A AA 7018/7018 Acclaim Group 1 CC 60 A AA 7018/7018 Acclaim Group 1 CC 65, CC 70 A AA 7018/7018 Acclaim Group 1 CD 70 A AA 7018/7018 Acclaim/8018 Group 1 CD 80 A AA 8018/8018-SR SA 75/83 CF 65, CF 70 B AA 8018-C1 OK 13.28 CF 66, CF 71 B AA 8018-N
— assets.esab.com, retrieved 2026-09-16
Where each value comes from
This source states these in separate places, so each value is shown with the passage it comes from.
ESAB-recommended FCAW (gas-shielded flux-cored) filler
The source prints this value inside the passage below but does not name it there. The passage shows where it appears; what ties it to this record is the position on the page, not anything the passage says.
DS 9000-C1
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 2026-09-16
Source
- assets.esab.comhttps://assets.esab.com/assetbank-esab/assetfile/22174.pdf