DAIKOWM D2

GMAW
  • HIGH YIELD STRENGTH STEELS
80-90ksi

Description

Low alloy solid wire for high yield strength steels
High strength low alloy steels with improved elevated temperature performance over that of C-Mn steels. Used for the fabrication of vessel and associated pipework demanding creep rupture strength and ductility up to about 450°C. Good toughness at low temperatures.
Specifications
ISO 14341-A
G 4Mo
AWS A5.28
ER80S-D2*
Shielding
M20, M21
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)
11
Chem. Comp. %
DEFAULT
C
0.08
Mn
1.9
Ni
0.05
Cr
0.03
P
0.01
S
0.01
Mo
0.45
Si
0.7
Cu
0.12
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
660
Yield strength Rp0.2 MPa
470
540
Elongation A (L0=5d0) %
17
23
Impact Charpy ISO-V
27J @ -30°C
60J @ -20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1 mm
1.2 mm
Ampere
170A - 220A
180A - 300A
Voltage
24V - 28V
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

Recommended for high-strength low-alloy steels with a minimum yield strength of up to 540MPa, these consumables offer enhanced elevated temperature performance compared to CMn steels. They are employed in fabricating vessels and associated pipework, catering to the demand for exceptional creep rupture strength and ductility, as high as 450°C. Demonstrating good toughness at low temperatures, they are ideal for crafting higher-strength steels intended for stress-relieved conditions. Specifically designed for offshore oil well-head process pipework and fittings, these low-nickel consumables meet NACE MR0175 requirements (<1% Ni & <22 HRC), ensuring resistance to sulphide-induced stress corrosion cracking in sour service, coupled with impressive sub-zero toughness. Additionally, they find utility in repairing medium-strength, low-alloy steel castings, especially in cases where stress relief alone (rather than normalizing and tempering) is applied. The actual preheat and post-weld heat treatment (PWHT) specifications hinge on the base material being welded, typically falling within the range of 100-250°C for preheat/interpass temperatures, with PWHT being a mandatory step in these applications.

Alloy Type

Low alloy steel consumables with MnMo additions for welding high strength steels with ultimate tensile strength to 620 MPa (90ksi).

Microstructure

In the stress relieved condition the microstructure consists of tempered bainite.

Materials


EN W.Nr.: P295 G H, P355 G H, 16Mo2, 17Mo3, 14Mo6, S275, S355, S420, S275, S355, S420.
ASTM: A 487 Gr 2A, 2B & 2C.

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