A473 · 501A, 501B
For A473 · 501A, 501B, astm specification is A473; class or grade is 501A, 501B; esab preheat group is D; esab-recommended smaw (stick) filler is AA 8018-B8; suggested preheat, low hydrogen (h8 and less), by thickness is T < .75: 300, .75 < T < 1.5: 400, 1.5 < T < 2.5: 400, T > 2.5: 500, recorded from its source on 2026-08-31.
- ASTM specification
- A473 verified
- Class or grade
- 501A, 501B verified
- ESAB preheat group
- D verified
- ESAB-recommended SMAW (stick) filler
- AA 8018-B8 verified
- Suggested preheat, low hydrogen (H8 and less), by thickness
- T < .75: 300, .75 < T < 1.5: 400, 1.5 < T < 2.5: 400, T > 2.5: 500 our reading
- Suggested preheat, hydrogen above H8, by thickness
- 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
A473 201, 302 AR 308/308H/308L, OK 61.25 Autrod/Tigrod 308H/308L/308LSi 202 AR 308/308H, OK 61.25 Autrod/Tigrod 308H 304, 308 AR 308/308H/308L, OK 61.25 Autrod/Tigrod 308H/308L/308LSi 304L AR 308L Autrod/Tigrod 308L/308LSi 305 AR 308/308H/309/309H, OK 61.25 Autrod/Tigrod 308H 309 AR 309/309H 309S AR 309L Autrod/Tigrod 309L/309Si 310, 310S OK 67.13 Autrod/Tigrod 310 316 AR 316/316H/316L Autrod/Tigrod 316L/316LSi 316L AR 316L Autrod/Tigrod 316L/316LSi 317 Autrod/Tigrod 317L 321, 347, 348 OK 61.8161.85 Autrod/Tigrod 347/347Si 405 C OK 68.17 Autrod/Tigrod 410NiMo 429 AR 309L, OK 67.13 Autrod/Tigrod 309L/309Si/310 430 Autrod/Tigrod 430Ti/430LNb S31254 250 max OK NiCrMo-3 Autrod/Tigrod NiCrMo-3 S32550, S32760, S32950 OK 67.55/67.53 Autrod/Tigrod 2209 501A, 501B D AA 8018-B8
— 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