Stainless steels
FERVEO INX 309
covered electrode · stick electrodeCatalogue only
AWS class
E 309 -15
EN ISO class
E 22 12 B 22
Tensile strength (Rm)
550–650 MPa
Classification
| AWS class | E 309 -15 |
|---|---|
| EN ISO class | E 22 12 B 22 |
Purpose
- Basic-coated Cr-Ni-Si 22/12 electrode, scaling-resistant to 1000°C — for cast, forged and rolled heat-resistant steel.
Why it works
The Si-alloyed core raises high-temperature oxidation resistance above the rest of the 309 family — meant for the final pass on joints exposed to reducing or sulfurous gases, where that last layer specifically calls for this electrode.
Fields of application
- Cast, forged and rolled heat-resistant steel, and heat-resistant ferritic Cr-Si-Al steel.
- Annealing and hardening plants, steam boiler construction, crude oil and ceramics industry.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.085 |
| Cr | 22.5 |
| Mn | 1.8 |
| Ni | 12.5 |
| Si | 0.9 |
Mechanical properties
| Tensile strength (Rm) | 550–650 MPa |
|---|---|
| Yield strength (Rp0.2) | 360 MPa |
| Elongation (A5) | 25 % |
| Impact energy (KV) | 47 J (20 °C) |
Process
| Polarity | DC+ |
|---|---|
| Positions | PAflatPBhorizontal-verticalPChorizontalPDhorizontal-overheadPEoverheadPFvertical-up |
Sizes and part numbers
| Ø | Length | Current | Request |
|---|---|---|---|
| 2.5 mm | 250 mm | 60–80 A | |
| 3.2 mm | 350 mm | 80–110 A | |
| 4 mm | 350 mm | 110–140 A |
Base metals
X15CrNiSi20 12X10CrAl7X10CrAl13X10CrAl18G-X40CrNiSi229G-X40CrSi17G-X30CrSi6AISI 305ASTM; A297HFTS EN ISO 3581-A : E 22 12 B 22EN ISO 3581-A : E 22 12 B 22AWS A5.4 : E 309 -15
Advantages
- Resistant to scaling up to 1000°C.
- Suited to the final layer in joints exposed to reducing or sulphurous gases.
Limitations
- Intended for continuous high-temperature service; if the part cools after prolonged exposure at 600–900°C, room-temperature toughness may drop due to sigma-phase formation.