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Volume
2008 I
Issue
6
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Taban, Emel
; Kaluc, Erdinc
; Deleu, Eddy
; Dhooge, Alfred
Flux-cored arc welding properties of modified
12% Cr ferritic stainless steel
Welding and Cutting 7 (2008) [6] 354-359
Specialist Articles
Abstract:
12% Cr stainless steels potentially with better weldability than either
ferritic or martensitic types are widely used as low-cost, utility
stainless steels due to their sufficient corrosion resistance in atmospheric
and non-aggressive aqueous conditions in many applications
such as coal and gold mining, sugar-processing industries,
road and rail transport and power generation. In this study, a
modified type of X2CrNi12 ferritic stainless steel conforming to
1.4003 in EN 10 088-2 and EN 10028-7 and UNS S41003 in ASTM
A240 with a lower carbon content (<0.01%) to improve the weldability
has been used and the properties of flux-cored arc-welded
20 mm thick modified 12Cr plates were investigated. Joints were
subjected to mechanical testing by means of Charpy impact,
crack tip opening displacement (CTOD) fracture toughness, tensile
and bend tests. Chemical analysis of the weld metal and microstructural
examinations were carried out, including hardness
surveys, ferrite content measurements and grain size analysis of
various weld regions. To determine atmospheric corrosion resistance,
salt spray and blister tests were carried out in order to investigate
all aspects of the weld properties. The relation between
the toughness and the microstructure is determined. Interpreting
all the data obtained, it can be concluded that if the improved
weldability of this modified 12% Cr stainless steel with a controlled
chemical composition could be provided, higher productivity
during welding would be enhanced and application areas
would largely be extended as an innovative aspect.
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