Characteristics of the Structure of Welded Joints in Sanicro 25 Steel

2013 ◽  
Vol 212 ◽  
pp. 71-74 ◽  
Author(s):  
Przemysław Jamrozik ◽  
Maria Sozańska
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Welded Joints ◽  
Structural Elements ◽  
Quality Class ◽  
Welding Technology ◽  
Class B ◽  
Material Studies

Sanicro 25 stainless steel (X7NiCrWCuCoNbNB25-23-3-3-2) is a preferred material for structural elements of boilers with supercritical and ultracritical parameters. Welded joints are critical sites that are vulnerable to failure. Hand-welded and automatically uniform welds of Sanicro 25 are evaluated in material studies, and the structure and basic mechanical properties of welded joints are examined. The proposed welding technology for Sanicro 25 ensures proper microstructure, and has obtained quality class B certification.

Tests of Welded Joints of New Generation Austenitic, Stainless Steel HR3C

2015 ◽  
Vol 226 ◽  
pp. 65-68 ◽  
Author(s):  
Stanisław Lalik
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Welded Joints ◽  
Elevated Temperatures ◽  
High Quality ◽  
Welding Technology ◽  
New Generation

The paper presents the characteristics of a new generation of austenitic stainless HR3C also used on items of equipment operating at elevated temperatures. Changed welding technology and the results of metallographic and mechanical properties of joints. Developed and implemented welding technology made it possible to obtain high-quality connectors, the correct construction of the required structural and mechanical properties.

Characterization of Dissimilar Welded Joints Between Austenitic and Duplex Stainless Steel Grades for Liquid Tank Applications

2018 ◽  
Author(s):  
G. Ubertalli ◽  
M. Ferraris ◽  
P. Matteis ◽  
D. Di Saverio
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Welded Joints ◽  
Industrial Applications ◽  
Duplex Stainless Steels ◽  
Steel Pipes ◽  
Steel Grades ◽  
Welding Processes

Lean duplex stainless steels have similar corrosion and better mechanical properties than the austenitic grades, which ensure their extensive spreading in industrial applications as a substitute of austenitic grades. In the construction of liquid tanks, however, it is often necessary to weld such steels with a range of fittings which are commonly fabricated with austenitic stainless steel grades. Therefore, this paper examines dissimilar welded joints between LDX 2101 (or X2CrMnNiN22-5-2) lean duplex stainless steels plates and austenitic stainless steel pipes, carried out by different arc welding processes. The investigation focuses on the correlation between the welding procedures and the microstructural and mechanical properties of the welded joints.

The Effect of Stand - Off Distance on the Mechanical Properties of TIG Butt Joints of 316 Stainless Steel

2020 ◽  
Vol 833 ◽  
pp. 59-65
Author(s):  
Hala M. Gnedi ◽  
Khawla T. Snoussi ◽  
Abulmaali M. Taher ◽  
Thoria G. Sharef ◽  
Yousef Arebi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Base Metal ◽  
Welded Joints ◽  
Hardness Test ◽  
Scanning Speed ◽  
Geometrical Parameters ◽  
Worst Case ◽  
316 Stainless Steel ◽  
Hardness Values

The objective of this study is to investigate and determine the effect of the stand-off distance (distance between the welded plates) on the mechanical properties of the Tungsten Inert Gas (TIG) welded joints. Butt TIG welding was performed for 316 stainless steel (SS) by using different pre welding stand-off distances with fixing the other parameters (thickness of welded plates, voltage, current, groove shape, and scanning speed). The influence of the stand-off distance parameter was examined by using tensile test, hardness test in the three different regions (base metal, heat effected zone, and molten zone), non-destructive testing (including visual inspection, liquid pentrant and X – ray) and microscopic examinations. Results show that the stand-off distance is one of the most important geometrical parameters of the Butt welded joints to end by good mechanical properties. It is found that the optimum stand-off distance was about 1 mm (shows the highest hardness results), but still there were some defects in some spots in the molten metal zone which caused a decrease in the hardness values in these locations. The 2 mm stand-off distance shows reasonable results, and the worst case was recorded for the 0 mm stand-off distance condition. Generally the hardness values of the heat affected zone in all conditions were the highest when compared to both metal welding zone and the base metal zone.

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