G-TECH 108

SMAW
  • CARBON STEELS
STRUCTURAL STEEL

Description

Basic coated electrode for C-Mn steels
Basic type electrode with 110% recovery for welding medium strength steels (minimum yield strength 420 MPa). Also suitable for structures cladding dynamic loads. Excellent for root pass on pipes and in all positional welding. Good toughness at low temperature. Its basic coating ensures excellent positional welding characteristics with good gap bridging ability. The weld pool and slag are easy to control and facilitate the achievement of a clean bead surface even in narrow preparations and in root pass.
Specifications
ISO 2560-A
E 42 4 B 42
AWS A5.1
E7018
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
AC, DC+
Packaging Type
Carton box and dry pack
Asme qualifications
F-No (QW432)
4
A-No (QW442)
1
Chem. Comp. %
DEFAULT
C
0.07
Mn
1
P
0.02
S
0.01
Si
0.5
Mechanical Properties
min
variant
Tensile strength Rm MPa
490
540
Yield strength Rp0.2 MPa
420
420
Elongation A (L0=5d0) %
22
25
Impact Charpy ISO-V
27J @ -40°C
90J @ -30°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
5 mm
Ampere
50A - 80A
80A - 120A
110A - 160A
160A - 200A
Voltage
-
-
-
-
Packaging
50 pcs/kg
31 pcs/kg
20 pcs/kg
10 pcs/kg
Packaging Type
Carton box and dry pack
Carton box and dry pack
Carton box and dry pack
Carton box and dry pack
Description

Application

Carbon-manganese (C-Mn) steels serve as the predominant structural steels extensively used across various applications in the engineering industry. Successful welding of C-Mn steel fabrications is generally achievable, provided the steel composition is known, necessary precautions are taken, and qualified procedures are adhered to. Weldability varies among C-Mn steels, with potential cracking mechanisms, including hydrogen cracking, solidification cracking, and reheat cracking, depending on specific circumstances. These consumables effectively resist such issues, emphasizing the importance of a meticulous welding procedure. While preheat and post-weld heat treatment (PWHT) may not be universally required, the actual specifications depend on the grade and thickness of the base material being welded. Attaining the required mechanical properties in a welded joint with C-Mn steels is achievable through the use of appropriate welding consumables. However, the intricate structural changes during the weld thermal cycle necessitate careful evaluation of properties such as heat-affected zone (HAZ) toughness and hardness.

Alloy Type

Consumables for welding mild and C-Mn steels of 340-510MPa tensile strength.

Microstructure

Predominantly ferrite.

Materials

Carbon and carbon-manganese steels encompass a wide range of structural and pressure-grade materials commonly used in construction, mechanical engineering, and industrial plant applications. Among the EN-standardized grades are non-alloy structural steels intended for general use, known for their good weldability and progressively higher mechanical strength. The “P” grades, on the other hand, are pressure vessel steels typically used in boilers and heat exchangers. Equivalent ASTM specifications cover a similar scope of applications and are widely adopted internationally for structural components, piping, and fittings exposed to pressure or high temperatures. Lastly, API specifications are typical of the oil & gas sector, particularly for the production of pipelines used in hydrocarbon transport, offering increasing levels of mechanical strength and specific performance requirements.
  • EN W.Nr.: S 235 JR, S 235 J0, S 235 J2+N, S 275, S 275 J0, S 275 J2+N, S 355 JR, S 355 J0, S 355 J2+N, S 355 K2+N, P 235 GH, P 265 GH, P 295 GH
  • ASTM: A36, A106 gr. A, A106 gr. B, A106 gr. C, A139, A210 gr. A1, A210 gr. C, A234 gr. WPB, A334 gr. 1, A216 gr. WCA, A216 gr. WCB, A216 gr. WCC
  • API: A, B, X42, X52, X60

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