Mechanisms of equiaxed grain formation in ferritic stainless steel gas tungsten arc welds

1995 ◽  
Vol 194 (2) ◽  
pp. 187-191 ◽  
Author(s):  
J.C. Villafuerte ◽  
H.W. Kerr ◽  
S.A. David
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Gas Tungsten Arc ◽  
Grain Formation ◽  
Gas Tungsten ◽  
Gas Tungsten Arc Welds ◽  
Equiaxed Grain

Qualification of Laser Welded High Performance S44660 Ferritic Stainless Steel for Condenser Tube Applications

2003 ◽  
Author(s):  
James D. Fritz ◽  
Curtis W. Kovach
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
High Performance ◽  
Sheet Material ◽  
Cooling Water ◽  
Welding Process ◽  
Gas Tungsten Arc ◽  
Critical Pitting Temperature ◽  
Gas Tungsten ◽  
Welding Processes

The laser tube welding process has for the first time been used to produce power plant steam condenser tubing in the high performance ferritic stainless steel grade UNS S44660. This material has traditionally been produced as welded tubing by the gas tungsten-arc welding process for use in seawater and other severe cooling water environments. To verify the corrosion resistance of this new product, corrosion tests have been conducted on production tubing to compare the traditional and new welding processes. The acidified ferric chloride test was used for evaluation because it is a meaningful aggressive test capable of measuring resistance to localized pitting corrosion, the most common potential failure mode for stainless steels used in cooling water environments. Pitting tests conducted over a range of temperatures produced a critical pitting temperature of 65°C for laser welded-annealed tube. This critical pitting temperature was demonstrated to be equal to that of as-produced S44660 sheet material or that of gas tungsten-arc produced tubing. The tubing met all other metallurgical and mechanical property quality requirements. When pitting did occur it exhibited no preference for initiation at welds. Thus, laser welded. high performance stainless condenser tubing should be fully capable of providing good performance in severe cooling water environments.

scholarly journals Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

2013 ◽  
Vol 53 (12) ◽  
pp. 2167-2175 ◽  
Author(s):  
Ken Kimura ◽  
Shigeo Fukumoto ◽  
Gen-ichi Shigesato ◽  
Akihiko Takahashi
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Grain Formation ◽  
Mg Addition ◽  
Equiaxed Grain
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