Corrosion Resistance of Superaustenitic Stainless Steel UR B66 in Chloride-Containing Media*

2021 ◽  
pp. 82-95
Author(s):  
J-P. Audouard
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Superaustenitic Stainless Steel

INCOLOY ALLOY 25-6HN

Alloy Digest ◽  
2010 ◽  
Vol 59 (3) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Superaustenitic Stainless Steel ◽  
Incoloy Alloy

Abstract Incoloy alloy 25-6HN is a 6% Mo superaustenitic stainless steel. It offers an excellent combination of strength, ductility, and resistance to corrosion by a variety of media at an economical price. It is readily formed and welded. The properties of the alloy are enhanced by its content of nitrogen. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: SS-1056. Producer or source: Special Metals Corporation.

Influence of Microstructure on Pitting Corrosion Resistance of Alloy 904L Superaustenitic Stainless Steel

CORROSION ◽  
10.5006/0534 ◽  
2012 ◽  
Vol 68 (8) ◽  
pp. 739-746 ◽  
Author(s):  
B.A.R.S. Barbosa ◽  
S.S.M. Tavares ◽  
A. Cobuci ◽  
M.C.S. de Macêdo
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperatures ◽  
Pitting Corrosion ◽  
Nickel Content ◽  
Microstructural Analysis ◽  
Superaustenitic Stainless Steel ◽  
Pitting Corrosion Resistance ◽  
High Nickel ◽  
Mo Additions

Alloy 904L (UNS N08904) is a superaustenitc stainless steel with high Cr and Mo additions. The steel also contains high nickel content, which is important to maintain the austenitic structure. Because of its high corrosion resistance, Type 904L alloy is being used in much equipment in chemical and petrochemical plants. Some of this equipment may experience high temperatures in service or during fabrication. The microstructural changes associated with exposures in the range of 650°C to 850°C or as a consequence of melting were analyzed in this paper. The microstructure/corrosion resistance relationships were studied by means of electrochemical pitting corrosion tests and microstructural analysis. Critical pitting temperatures (CPT) of annealed and cast specimens were determined and compared. The results show that the corrosion resistance can vary significantly with fabrication processes and/or service at high temperatures.

ALLEGHENY LUDLUM AL 6XN ALLOY

Alloy Digest ◽  
1988 ◽  
Vol 37 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Pressure Vessel ◽  
Room Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Superaustenitic Stainless Steel ◽  
Temperature Performance ◽  
Section Viii

Abstract Allegheny Ludlum AL-6XN alloy is characterized as a superaustenitic stainless steel having an exceptional level of corrosion resistance, especially to chloride pitting. It has high strength and its impact value at room temperature is 140 ft-lb and at 320 F (196 C) is 85 ft-lb. It is covered by ASME Boiler and Pressure Vessel Code (Case 1997 for Section VIII and Case N-438 for Section III Construction). This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-494. Producer or source: Allegheny Ludlum Corporation.

CLI-SR 50A

Alloy Digest ◽  
1996 ◽  
Vol 45 (11) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Pollution Control ◽  
Heat Treating ◽  
High Nitrogen ◽  
Superaustenitic Stainless Steel ◽  
High Toughness ◽  
Nitrogen Additions ◽  
Pollution Control Equipment

Abstract CLI-50A is a Korean 6 Mo superaustenitic stainless steel with improved corrosion resistance properties. The chromium additions have been increased up to 22% together with high nitrogen additions. The PREN value [%Cr] + 3.3 [%Mo] + 16[%N] is higher than 45. The alloy is copper free. This alloy is particularly well designed for seawater applications and pollution control equipment. The chemistry is balanced to obtain an austenitic microstructure that explains the high toughness properties, including those at -196deg C (-320 deg F). This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength. It also includes information on forming, heat treating, and joining. Filing Code: SS-660. Producer or source: Cruesot-Loire Industrie.

Phase Transformations on ASTM a 744 Gr. CN3MN Superaustenitic Stainless Steel after Heat Treatment

2011 ◽  
Vol 312-315 ◽  
pp. 56-63 ◽  
Author(s):  
Marcio Ritoni ◽  
M. Martins ◽  
F. C. Nascimento ◽  
Paulo Roberto Mei
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Phase Transformations ◽  
Grain Boundaries ◽  
Sigma Phase ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
Superaustenitic Stainless Steel ◽  
X Ray

The superaustenitic stainless steel ASTM A 744 Gr. CN3MN (22Cr-25Ni-7Mo-0.2N) has as mainly characteristic high corrosion resistance in severe environment. As the corrosion resistance depends on the microstructure, it was investigated the phase transformations after a solution treatment at 1200°C. Thermocalc calculation for 53Fe-25Ni-22Cr alloy indicates austenitic phase between 1300 and 800°C and austenite + sigma phase below 800°C. The as-cast steel studied presented 2.7 % of precipitates volume fraction and the precipitates were located on the grain boundaries and inside the austenitic grains. X-ray diffraction confirmed the presence of sigma phase in as-cast sample. Scanning electron microscopy showed that the level of Cr and Mo was higher in the precipitates than in the austenitic matrix and the Ni content was higher in matrix compared to precipitates. After heating at 1200°C during 90 minutes, the precipitate volume fraction was reduced to 2.1 % and the grain boundaries precipitates were dissolved. The microstructural analyses made through transmission electron microscopy and X-ray diffraction showed the presence sigma phase and M6C carbide.

On Corrosion Resistance Of Austenitic Stainless Steel Clad Layer on a Low Alloy Steel

2018 ◽  
Vol 32 (3) ◽  
pp. 20
Author(s):  
Manas Kumar Saha ◽  
Ritesh Hazra ◽  
Ajit Mondal ◽  
Santanu Das
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Alloy Steel ◽  
Low Alloy Steel ◽  
Clad Layer

ACI HW

Alloy Digest ◽  
1957 ◽  
Vol 6 (11) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Base Alloy ◽  
Heat Treating ◽  
Cyclic Heating ◽  
Nickel Base Alloy ◽  
Type Alloy ◽  
Temperature Performance ◽  
Nickel Base

Abstract Type HW is a nickel-base alloy containing chromium and iron. It is austenitic, non-magnetic, and has exceptionally high resistance to corrosion, cyclic heating, and oxidation. It is of the 60 Ni-12Cr type alloy. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Ni-37. Producer or source: Stainless steel foundries. Revised as Alloy Digest Ni-449, April 1994.

UGIMA 4404 HM

Alloy Digest ◽  
2013 ◽  
Vol 62 (9) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
General Purpose ◽  
Corrosion Resistant

Abstract Ugima 440 HM is a general-purpose, corrosion resistant austenitic stainless steel with added molybdenum (300 series with 2–2.5% Mo). It features improved machinability compared with 4404 or 316L. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1156. Producer or source: Schmolz + Bickenbach USA Inc..

CTS-BD30P ALLOY

Alloy Digest ◽  
2013 ◽  
Vol 62 (8) ◽  
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Martensitic Stainless Steel ◽  
Heat Treating ◽  
Powder Metal ◽  
High Concentration ◽  
Vanadium Carbides

Abstract Carpenter CTS-BD30P alloy is a powder metal processed, air-hardening, martensitic stainless steel that offers corrosion resistance comparable with Type 440C stainless, combined with excellent toughness and wear resistance attributed to a high concentration of vanadium carbides. The Carpenter CTS family of alloys is used for many blade applications. This datasheet provides information on composition and physical properties. It also includes information on corrosion resistance as well as heat treating and powder metal forms. Filing Code: SS-1154. Producer or source: Carpenter Specialty Alloys.

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