Stainless Steels With Improved Oxidation Resistance for Recuperators

2004 ◽  
Vol 128 (2) ◽  
pp. 370-376 ◽  
Author(s):  
Bruce A. Pint
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Oxidation Resistance ◽  
Stainless Steels ◽  
Lower Cost ◽  
Exhaust Gas ◽  
New Materials ◽  
Excellent Corrosion Resistance ◽  
Gas Environment

New materials are being evaluated to replace type 347 stainless steel in microturbine recuperators operating at higher temperatures in order to increase the efficiency of the microturbine. Commercial alloys 120 and 625 are being tested along with potentially lower cost substitutes, such as Fe-20Cr-25Ni and Fe-20Cr-20Ni. Long-term testing of these materials at 650–700 °C shows excellent corrosion resistance to a simulated exhaust gas environment. Testing at 800 °C has been used to further differentiate the performance of the various materials. The depletion of Cr from foils of these materials is being used to evaluate the rate of attack. Although those alloys with the highest Ni and Cr contents have longer lives in this environment, lower alloyed steels may have sufficient protection at a lower cost.

Stainless Steels With Improved Oxidation Resistance for Recuperators

2004 ◽  
Author(s):  
Bruce A. Pint ◽  
Karren L. More
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Oxidation Resistance ◽  
Stainless Steels ◽  
Lower Cost ◽  
Exhaust Gas ◽  
New Materials ◽  
Excellent Corrosion Resistance ◽  
Gas Environment

New materials are being evaluated to replace type 347 stainless steel in microturbine recuperators operating at higher temperatures in order to increase the efficiency of the microturbine. Commercial alloys 120 and 625 are being tested along with potentially lower cost substitutes such as Fe-20Cr-25Ni and Fe-20Cr-20Ni. Long-term testing of these materials at 650°–700°C shows excellent corrosion resistance to a simulated exhaust gas environment. Testing at 800°C has been used to further differentiate the performance of the various materials. The depletion of Cr from foils of these materials is being used to evaluate the rate of attack. While those alloys with the highest Ni and Cr contents have longer lives in this environment, lower alloyed steels may have sufficient protection at a lower cost.

CRUCIBLE 174 SXR

Alloy Digest ◽  
2009 ◽  
Vol 58 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Precipitation Hardening ◽  
High Strength ◽  
Heat Treating ◽  
Martensitic Stainless Steels ◽  
Excellent Corrosion Resistance

Abstract Crucible 174 SXR is a premium-quality precipitation-hardening stainless steel designed for use as rifle barrels. It is a modification of Crucible’s 17Cr-4Ni that offers substantially improved machinability without sacrificing toughness. Its excellent corrosion resistance approaches that of a 300 series austenitic stainless steel, while its high strength is characteristic of 400 series martensitic stainless steels. At similar hardness levels, Crucible 174 SXR offers greater toughness than either the 410 or 416 stainless steels which are commonly used for rifle barrels. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming and heat treating. Filing Code: SS-1034. Producer or source: Crucible Service Centers.

Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators

2010 ◽  
Author(s):  
Bruce A. Pint ◽  
Michael P. Brady ◽  
Yukinori Yamamoto ◽  
Michael L. Santella ◽  
Philip J. Maziasz ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Oxidation Behavior ◽  
Alumina Scale ◽  
Exhaust Gas ◽  
Commercial Batch ◽  
Oxidation Testing ◽  
Thick Foil

A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic for creep strength while allowing the formation of a chemically-stable external alumina scale at temperatures up to 900°C. An alumina scale eliminates long-term problems with the formation of volatile Cr oxy-hydroxides in the presence of water vapor in exhaust gas. As a first step in producing foil for primary surface recuperators, three commercially cast heats have been rolled to ∼100μm thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675° and 750°C showing excellent creep strength compared to other candidate foil materials. Laboratory exposures in humid air at 650°-800°C have shown acceptable oxidation resistance. Similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65kW microturbine for 2,871h. One composition that showed superior creep and oxidation resistance has been selected for preparation of a commercial batch of foil.

ARCELORMITTAL K36X

Alloy Digest ◽  
2010 ◽  
Vol 59 (6) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Lower Cost ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Bend Strength

Abstract ArcelorMittal K36X is a ferritic stainless steel, mostly used as a stable price lower cost substitute for nickel containing austenitic stainless steels for corrosion applications. The “X” indicates this alloy is a muffler grade. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1068. Producer or source: Arcelor Stainless Processing LLC.

ARCELORMITTAL K03

Alloy Digest ◽  
2009 ◽  
Vol 58 (8) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Lower Cost ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Temperature Performance

Abstract ArcelorMittal K03 is a ferritic stainless steel, mostly used as a stable price, lower-cost substitute for nickel-containing austenitic stainless steels. 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-1042. Producer or source: Arcelor Stainless Processing LLC.

Measurement of Deformation-Induced Martensite in Stainless Steel Using Magnetic Contact Force

2012 ◽  
Vol 706-709 ◽  
pp. 2217-2221
Author(s):  
Tadashi Nishihara
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Volume Fraction ◽  
Austenitic Stainless Steels ◽  
Measuring System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Excellent Corrosion Resistance ◽  
Novel Method

Metastable austenitic stainless steels are attractive industrial materials with excellent corrosion resistance, mechanical properties, and formability. However, during plastic deformation, α’martensite can be formed. The volume fraction of that particular phase influences the mechanical and other properties (such as corrosion resistance) of these steels. Therefore, it is important to determine the amount of α’martensite in the obtained microstructures. Currently, the volume fraction of deformation-induced martensite in stainless steel is most commonly measured by the X-ray diffraction or magnetic permeability methods. In this study, a novel method of measuring deformation-induced martensite using magnetic contact holding force is proposed. Measurement trials were carried out using a prototype measuring system, and the results of measurements taken from SUS301 and SUS304 stainless steels are discussed in terms of deformation and martensite volume fraction.

scholarly journals A CLOSER EXAMINATION OF THE CLAIMS OF EXCELLENT CORROSION RESISTANCE OF STAINLESS STEEL: TEXTBOOK MISCONCEPTIONS AND MISINTERPRETATIONS

2015 ◽  
Author(s):  
Aezeden O. Mohamed
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Alloying Elements ◽  
Excellent Corrosion Resistance ◽  
The Common ◽  
Engineering Materials

This paper examines misconceptions and misinterpretations concerning the common assertion in textbooks that stainless steels has excellent corrosion resistance due to the addition of alloying elements such as nickel (Ni), chromium (Cr), and molybdenum (Mo).A closer look at this claim reveals underlying assumptions that lead to this imprecise statement. Corrosion experiments have been established in a course in engineering materials that expose these assumptions.Following a discussion of the tests and their results, it is suggested that statements in textbooks that stainless steel has excellent corrosion resistance should be qualified. It is hoped that by bringing this shortcoming to the attention of engineering educators, the misconceptions and misinterpretations can be corrected.

ARCELORMITTAL K41

Alloy Digest ◽  
2011 ◽  
Vol 60 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Lower Cost ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Good Resistance ◽  
Corrosion And Oxidation

Abstract ArcelorMittal K41 is a ferritic stainless steel with good resistance to pitting corrosion and oxidation to 950 C (1742 F), mostly used as a stable price lower cost substitute for nickel containing austenitic stainless steels in a variety of applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: SS-1091. Producer or source: Arcelor Stainless Processing LLC.

ARCELORMITTAL K36

Alloy Digest ◽  
2009 ◽  
Vol 58 (12) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stainless Steels ◽  
Lower Cost ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Good Corrosion Resistance ◽  
Temperature Performance

Abstract ArcelorMittal K36 is a ferritic stainless steel with good corrosion resistance, mostly used as a stable price lower-cost substitute for nickel-containing austenitic stainless steels. 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-1049. Producer or source: Arcelor Stainless Processing LLC.

Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators

2011 ◽  
Vol 133 (10) ◽  
Author(s):  
Bruce A. Pint ◽  
Michael P. Brady ◽  
Yukinori Yamamoto ◽  
Michael L. Santella ◽  
Philip J. Maziasz ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Oxidation Behavior ◽  
Alumina Scale ◽  
Exhaust Gas ◽  
Commercial Batch ◽  
Oxidation Testing ◽  
Thick Foil

A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic for creep strength while allowing the formation of a chemically stable external alumina scale at temperatures up to 900°C. An alumina scale eliminates long-term problems with the formation of volatile Cr oxy-hydroxides in the presence of water vapor in exhaust gas. As a first step in producing foil for primary surface recuperators, three commercially cast heats have been rolled to ∼100 μm thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675°C and 750°C, showing excellent creep strength compared with other candidate foil materials. Laboratory exposures in humid air at 650–800°C have shown acceptable oxidation resistance. A similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65 kW microturbine for 2871 h. One composition that showed superior creep and oxidation resistance has been selected for the preparation of a commercial batch of foil.

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