A268 · TP439
For A268, class or grade is TP439; esab preheat group is C; esab-recommended mcaw (metal-cored) filler is AR MC439Ti/MC18CrCb; 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; suggested preheat by thickness, hydrogen above h8 — the a-d column for this grade's preheat group is T < .75: NR, .75 < T < 1.5: NR, 1.5 < T < 2.5: NR, T > 2.5: NR, recorded from its source on 2026-09-16.
- ASTM specification
- A268 verified
- Class or grade
- TP439 verified
- ESAB preheat group
- C verified
- ESAB-recommended MCAW (metal-cored) filler
- AR MC439Ti/MC18CrCb 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
A268 TP405 C OK 68.17 Autrod/Tigrod 410NiMo TP409 C AR 309/309H/308/308H, OK 61.25 Autrod/Tigrod 409Nb TP429 C AR 309L, OK 67.13 Autrod/Tigrod 309L/309Si/310 TP430Ti C Autrod/Tigrod 430Ti/430LNb TP439 C
— 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 MCAW (metal-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.
AR MC439Ti/MC18CrCb
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