DAIKOFLUX 490-W

SAW
  • CARBON STEELS
STRUCTURAL STEEL

Description

It is a fluoride-basic flux with high basicity and low impurities level such as P and S. As a result of low oxygen level in the weld metal high toughness at low temperature and uniform mechanical properties are achieved. It is suitable for welding on DC and AC using single and tandem wire processes.
The low hydrogen levels after redrying and the optimum mechanical properties enables welding of thick-walled construction steels with yield strength up to 420 MPa, off-shore application with YS up to 460 MPa on base materials like BS 4360-Grade 50 D and S355 2G3 according to EN 10025, fine grain structural steel for low temperature requirements with impact toughness at -60 °C or bellow, high tensile fine grain steel such as S690QL1 and N-A-XTRA® 70, boiler and pressure vessels steels such as 16Mo3/A204 grade A, 13CrMo4-5/A387 grade 12 or 10CrMo9-10/A387 grade 22.
Specifications
ISO 14174
S A FB 1 55 AC H5
Werkstoff Number
13
boniszewski_index
3.1
Packaging Type
25 kg plastic bag/metallic drum
Chem. Comp. %
0
SiO2+TiO2
15
Al2O2+MnO
20
CaO+MgO
40
CaF2
25
STRUCTURAL STEEL
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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