Gas metal arc welding of modified X2CrNi12 ferritic stainless steel

X2CrNi12 ferritic stainless steel is a low cost stainless steel grade exhibiting good corrosion and abrasion resistance. Typical applications for this steel are bus frames and chassis, railway wagons for coal and iron ore, mining and mineral processing, sugar and chemical process equipment, furnace parts etc. The modern production routes now allow fabricating this grade with low carbon content (< 0.015 %) and low impurity levels improving the weldability substantially. Regarding to these conditions, this modified stainless steel grade becomes more attractive. In this paper, microstructural and toughness properties and mechanical properties of gas metal arc welded 6 mm thick modified X2CrNi12 stainless steel with two different heat inputs are presented. Promising results have been obtained. Interesting correlation has been found between microstructure (e.g. grain size) and impact toughness

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Supermartensitic stainless steels: on a continous learning curve

Martensitic chromium steels have been used in the oil industry for decades as treaded tubing. For traditional Cr-steels the weldability is poor, which gives limitations for wider use in the pipeline and oil industry. Research headed by the steel industry has however developed new low carbon martensitic chromium steels with excellent weldability. These steels became interesting for use as flowline materials, due to their high strength up to elevated temperature and low cost compared to duplex stainless steels