G-TECH 347H

SMAW
  • AUSTENITIC STAINLESS STEELS
347H

Description

Rutile-basic coated electrode for joining 321 and 347 base materials
Its basic-rutile coating ensures an excellent combination of welding performance in all positions, except for vertical down, and a high resistance to cracking providing smooth arc transfer. Excellent weldability with a spatter free arc and self-releasing slag result in a very smooth bead appearance. Typical applications include components used in chemical and petrochemical process plant and in power generation stations.
Specifications
ISO 3581-A
E 19 9 Nb R 32
AWS A5.4
E347-16
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+, AC
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
5
A-No (QW442)
8

Ferrite

2-9 FN

Pren

19.5

Hardness

84HRB
Chem. Comp. %
DEFAULT
C
0.05
Mn
1.1
Ni
10.5
Cr
19.5
Nb
0.5
P
0.02
S
0.01
Si
0.9
Cu
0.07
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
580
Yield strength Rp0.2 MPa
350
420
Elongation A (L0=5d0) %
25
25
Impact Charpy ISO-V
-
60J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
5 mm
Ampere
50A - 80A
80A - 110A
110A - 150A
160A - 210A
Voltage
-
-
-
-
Packaging
56 pcs/kg
28 pcs/kg
19 pcs/kg
12 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Carton box
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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