DAIKOWS 347H

SAW
  • AUSTENITIC STAINLESS STEELS
347H

Description

Solid wire for joining 321 and 347 base materials for high service temperature applications
These Cr-Ni consumables are Nb-stabilized for welding steels grades, such as 321 and 347, that are stabilized with Ti or Nb. The presence of Nb reduces intergranular corrosion under severe operation conditions. Also suitable for cladding as on mild steel after a 309 buffer layer. If dilution by the base metal produces a low ferrite or fully austenitic weld metal, the crack sensitivity of the weld may increases substantially. Carbon content in the range of 0.04%–0.08% provides higher strength at elevated temperatures, up to 800°C.
Specifications
ISO 14343-A
S 19 9 Nb
AWS A5.9
ER347
Shielding
DAIKOFLUX 900-W
Positions
PA, PB, PC
Current
DC/AC
Packaging Type
K415 spool and drums.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
8

Ferrite

2-9 FN

Pren

19.83

Hardness

84HRB
Chem. Comp. %
DEFAULT
C
0.055
Mn
1.5
Ni
10
Cr
19.5
Nb
0.6
P
0.02
S
0.01
Mo
0.1
Si
0.35
Cu
0.07
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
660
Yield strength Rp0.2 MPa
350
450
Elongation A (L0=5d0) %
25
42
Impact Charpy ISO-V
-
100J @ -50°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.4 mm
Ampere
300A - 400A
Voltage
27V - 33V
Packaging
Ø 2,0÷4,0mm
Packaging Type
K415 spool and drums.
Description

Application

Utilized in welding titanium and niobium stabilized 18Cr/8Ni stainless steel, specifically types 321H and 347H, this method is employed across various components like catalytic crackers, cyclones, transfer lines, furnace parts, steam piping, superheater headers, and gas and steam turbine elements. Its applications span industries including petrochemical, chemical, and power generation. The significance of alloy 16.8.2 cannot be overstated, serving as a more ductile alternative to 347H consumables to prevent in-service Heat-Affected Zone (HAZ) failure in 347H base material exceeding 12mm in thickness. When dealing with thicker sections of 321H/347H, the preferred choice is 16.8.2 consumables. For general corrosion resistance at temperatures up to 400°C, recommended consumables are 347 or 308L. In cryogenic applications (>0.38mm Charpy lateral expansion at –196°C), it is advisable to use unstabilized weld metal. Notably, no preheating or Post Weld Heat Treatment (PWHT) is required, and the maximum interpass temperature is limited to 250°C.

Alloy Type

Controlled, high carbon Nb stabilized stainless steel for elevated temperature service.

Microstructure

Austenite with 2-9FN, typically 4FN (solid wire typically 8FN).

Materials


EN W.Nr.: 1.4941 (X6CrNiTiB18-10), 1.4961 (X8CrNiNb16-13), 1.4878 (X8CrNiTi18-10).
ASTM: 321H, 347H.
UNS: S32109, S34709.

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