G-TECH 90G

SMAW
  • HIGH YIELD STRENGTH STEELS
80-90ksi

Description

Basic coated electrode for high strength low alloy steels
This basic coated welding electrode deposits a low alloyed very tough weld metal with high tensile strength and yield point with a stable arc, regular deposit and easy deslagging. Used to weld steel with tensile strength between 620 and 760 N/mm2. During the use adopt preheat, interpass temperature and post weld treatment as required by the base material. Used to join cast steels, pipes, boilers, pressure vessel, bearing frameworks. It can also be used to join fine grain high strength low alloy steels for construction, pressure vessels and pipes.
Specifications
ISO 18275-A
E 62 4 1NiMo B 42
AWS A5.5
E9018-G
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+, AC
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
4
A-No (QW442)
3
Chem. Comp. %
DEFAULT
C
0.07
Mn
1.15
Ni
0.8
Cr
0.05
P
0.01
S
0.01
Mo
0.4
Si
0.6
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
620
730
Yield strength Rp0.2 MPa
620
670
Elongation A (L0=5d0) %
17
22
Impact Charpy ISO-V
47J @ -40°C
70J @ -20°C
Impact Charpy ISO-V
-
50J @ -40°C
Welding Parameters
2.5 mm
3.2 mm
4 mm
5 mm
Ampere
70A - 90A
100A - 140A
140A - 180A
180A - 240A
Voltage
-
-
-
-
Packaging
52 pcs/kg
21 pcs/kg
14 pcs/kg
9 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Carton box
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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