DAIKOWM 16.8.2

GMAW
  • AUSTENITIC STAINLESS STEELS
16.8.2

Description

Solid wire for high temperature stainless steel base materials
Suitable for 3XXH stainless steels in high temperature applications up to about 800°C. The controlled composition ensures good hot ductility properties, high resistance to thermal embrittlement by intermetallic phases. Ferrite <5FN content guarantees good toughness. Applications include furnace parts and components utilized in the petrochemical, chemical processing and power generation industries. The weld metal is usable in either the as-welded condition or solution-treated condition. Suitable to weld thicker section of 347H/321H base metal to avoid in-service failure.
Specifications
ISO 14343-A
G 16 8 2
AWS A5.9
ER16.8.2
Shielding
M12, M13
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+
Packaging Type
Drums, B300, D200 and D100 spools.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
8

Ferrite

1-6 FN

Pren

19.79
Chem. Comp. %
DEFAULT
C
0.05
Mn
1.5
Ni
8.5
Cr
15.5
P
0.015
S
0.005
Mo
1.3
Si
0.3
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
620
Yield strength Rp0.2 MPa
0
400
Elongation A (L0=5d0) %
35
35
Impact Charpy ISO-V
-
30J @ -196°C
Impact Charpy ISO-V
-
-
Welding Parameters
1 mm
1.2 mm
Ampere
160A - 220A
200A - 270A
Voltage
25V - 29V
26V - 30V
Packaging
Ø 0,8÷1,6mm
Ø 0,8÷1,6mm
Packaging Type
Drums, B300, D200 and D100 spools.
Drums, B300, D200 and D100 spools.
Description

Application

The 16.8.2 consumables, engineered with precise composition and ferrite control, excel in structural applications up to around 800°C while retaining cryogenic toughness down to -196°C. With Mo at the lower limit for AWS 16.8.2, they constitute a diluted hybrid akin to E308H and E316H. These consumables are versatile, suitable for welding the entire '3XXH' series of stainless steels, providing a balanced blend of creep, oxidation, and general corrosion resistance. Featuring low total Cr+Mo, controlled C, and ferrite content, they resist thermal embrittlement by intermetallic phases, positively impacting creep ductility and thermal fatigue. Stringent specifications prohibit Bismuth bearing constituents, maintaining Bi levels below 0.002% (API 582). Developed to prevent in-service Heat-Affected Zone (HAZ) failure in 347H and 321H materials over 12mm thickness, these consumables find applications in catalytic crackers, cyclones, transfer lines, furnace parts, thick-wall steam piping, superheater headers, and specific gas and steam turbine components within petrochemical, chemical process plants, and power generation industries. Preheating is unnecessary, and the maximum interpass temperature is capped at 250°C. Welds are left as-welded, eliminating the need for Post Weld Heat Treatment (PWHT).

Alloy Type

16.8.2 for high temperature 3XXH stainless steels.

Microstructure

Austenite with delta ferrite of 1-6FN typically. Hot cracking is not reported at low FN.

Materials


EN W.Nr.: 1.4948 ( X 6 CrNi 18 11), 1.4941 ( X 8 CrNiTi 18 10), 1.4961 (X 8 CrNiNb 16 13).
ASTM: 304H, 321H, 347H, 316H.
UNS: S30409, S32109, S34709, S31609.

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