Submerged arc
FERVEO SAW CrMo91 SAW
submerged-arc wireCatalogue only
AWS class
EB9
EN ISO class
S CrMo 91
Classification
| AWS class | EB9 |
|---|---|
| EN ISO class | S CrMo 91 |
Purpose
- 9% Cr, V-Nb-N microalloyed, bare solid wire for submerged-arc welding (SAW), P91 grade (AWS EB9, EN ISO S CrMo 91) — the top step of the FERVEO SAW Cr-Mo ladder.
Why it works
Adds vanadium, niobium and nitrogen to 9% chromium — the same microalloying system that makes the P91 grade the standard for supercritical boilers and very-high-temperature refining piping, here in submerged-arc form for mechanized welding.
Fields of application
- Joint welding on P91-grade steam boilers and pressure vessels, heat-resisting and hydrogen-service piping in the petroleum industry, with scaling resistance up to approximately 600°C.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.09 |
| N | 0.05 |
| V | 0.2 |
| Cr | 9 |
| Mn | 0.6 |
| Mo | 0.95 |
| Nb | 0.06 |
| Ni | 0.65 |
| Si | 0.25 |
Mechanical properties
Process
Supply programme
spools B280 / CC300 / K435/70
Base metals
A199 Gr T91A200 Gr T91A213 Gr T91A335 Gr T91A336 Gr T91A387 Gr T91A217 C12AA234 WP91A369 FP91X10CrMoV9-1X10CrMoVNb9-1BS1501 Gr 91
Advantages
- The highest-alloy, highest-temperature step in the entire FERVEO SAW Cr-Mo ladder.
- V-Nb-N microalloying — the same system that makes the P91 grade the supercritical-boiler standard.
Limitations
- P91 grade: requires a welding procedure (WPS) specifically qualified for this steel, with preheat and post-weld heat treatment matched to its martensitic microstructure.