Pitting, Crevice and stress corrosion resistance of high chromium und molybdenum alloy stainless steels

1984 ◽  
Vol 35 (12) ◽  
pp. 537-542 ◽  
Author(s):  
M. B. Rockel ◽  
M. Renner
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Stainless Steels ◽  
Molybdenum Alloy ◽  
High Chromium ◽  
Stress Corrosion Resistance

Influence of Alloying Elements on the Stress Corrosion Behavior of Austenitic Stainless Steel

CORROSION ◽  
1969 ◽  
Vol 25 (1) ◽  
pp. 15-22 ◽  
Author(s):  
A. W. LOGINOW ◽  
J. F. BATES
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Corrosion Cracking ◽  
Magnesium Chloride Solution ◽  
Stress Corrosion Resistance ◽  
Cold Worked

Abstract In certain applications, stress corrosion cracking of austenitic stainless steels has occurred when these steels are subjected to tension stresses (residual and applied) and are exposed to hot chloride solutions. Although stress corrosion cracking can be prevented by treatments to relieve residual stresses and by control of the environment, such procedures are expensive and not always reliable. An extensive study was therefore undertaken to develop a steel that would-be inherently resistant to stress corrosion cracking. The results of the study, conducted on stressed specimens of experimental steels immersed in a boiling 42% magnesium chloride solution, showed that carbon and nickel improved the stress corrosion resistance of annealed steels, and? nickel and silicon increased the resistance of cold-worked steels. It was also found that nitrogen decreased the resistance of annealed steels whereas phosphorus and molybdenum decreased the resistance of cold-worked steels. Manganese, copper, chromium, sulfur, and aluminum had little or no effect on stress corrosion resistance. This study resulted in the formulation of a steel composition containing 18% chromium, 18% nickel, 2% silicon, and 0.06% carbon, with low phosphorus and molybdenum contents. This steel was melted in an electric furnace; and1 its, stress corrosion, corrosion, and mechanical properties were determined. Test results show that the new steel (called USS 18-18-2 stainless steel) is much more resistant to stress; corrosion cracking than currently available austenitic stainless steels. Furthermore, the resistance of this steel is better than that of a 20% chromium, 34% nickel alloy that is being marketed; for its resistance to stress corrosion cracking.

UNILOY 326

Alloy Digest ◽  
1970 ◽  
Vol 19 (7) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Distinct Advantage ◽  
Two Phase ◽  
Stress Corrosion Resistance

Abstract UNILOY 326 is a two-phase, ferromagnetic stainless steel characterized by high strength and very good general and stress corrosion resistance. It has distinct advantage for the fastener industry. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-241. Producer or source: Cyclops.

CRUCIBLE 26-1

Alloy Digest ◽  
1975 ◽  
Vol 24 (2) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Intergranular Corrosion ◽  
Heat Treating ◽  
High Chromium ◽  
Furnace Melting ◽  
Chromium Stainless Steel

Abstract Crucible 26-1 is a fully ferritic, titanium-stabilized, high-chromium stainless steel characterized by outstanding resistance to pitting and stress corrosion in chloride-containing environments. The steel is weldable and very resistant to intergranular corrosion after welding. It is produced by electric-furnace melting and AOD (Argon-Oxygen Deoxidation) refining. 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-306. Producer or source: Crucible Stainless Steel Division, Colt Industries.

Comparison of Stress Corrosion Cracking of High-Chromium Stainless Steels

2021 ◽  
Vol 73 (07) ◽  
pp. 53-54
Author(s):  
Chris Carpenter
Keyword(s):  
High Pressure ◽  
Tensile Strength ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Electrochemical Measurement ◽  
Corrosion Cracking ◽  
High Chromium ◽  
High Pressure High Temperature ◽  
Elongation To Failure

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper NACE 2020-14695, “Comparison of Stress Corrosion Cracking Behavior of Fe13Cr5Ni- and Fe17Cr5.5Ni-Based High-Chromium Stainless Steels in High-Pressure/High-Temperature CO2 Environments,” by Yameng Qi, Zhonghua Zhang, and Chunxia Zhang, Baoshan Iron and Steel, prepared for the 2020 NACE International Corrosion Conference and Exposition, Houston, 14–18 June. The paper has not been peer reviewed. Stress corrosion cracking (SCC) of Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys in high-pressure/high-temperature (HP/HT) carbon dioxide (CO2) environments was investigated through slow-strain-rate tests (SSRTs) and electrochemical methods. The results show that a remarkable decrease in tensile strength and elongation to failure was observed when testing in a CO2 environment compared with that of air. Fe17Cr5.5Ni-based alloys possessed better SCC resistance than Fe13Cr5Ni-based alloys. The better SCC resistance of the former could be attributed to good repassivation capacity and pitting-corrosion resistance induced by the increase in chromium (Cr) and nickel (Ni) content. Introduction When service temperature exceeds 150°C, SCC resistance of Fe13Cr5Ni-based alloys could become an issue. Compared with Fe13Cr5Ni-based alloys, 22Cr duplex stainless steel has an excel-lent performance when exposed to temperatures over 150°C and stable SCC resistance in HP/HT CO2 environments. However, the cost of 22Cr duplex stainless steel is extremely high. Experimental Procedure Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys were produced by the authors’ research institute. The materials were in a quenched and tempered state. For micrographic observation, each specimen was ground with 2,000-grit carbide silicon paper and polished with 1.2-µm diamond paste. They were then degreased with acetone and etched with hydrochloric ferric chloride solution (a mixture of 5-g ferric chloride, 25-mL hydrochloric acid, and 25-mL ethanol). The steel microstructures were characterized using an optical micro-scope. The micrograph in Fig. 1a for the F-13Cr5Ni-based alloys shows a martensite phase with no notable second phases. Fe17Cr5.5Ni alloys possess long strip ferrite and martensite phases (Fig. 1b). For SSRTs, smooth tensile specimens with a gauge length of 25.4 mm and a diameter of 3.81 mm were prepared. The specimens were cut from the Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys into an 8-mm-thick, 12-mm-outer- diameter disc for electrochemical measurement. All specimens were polished to a 1,200-grit surface finish, degreased with acetone, cleansed with distilled water, and dried in air. SSRT and electrochemical-measurement procedures are detailed in the complete paper. Results SCC Susceptibility. As expected, tensile strength and elongation to failure of Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys deteriorated in HP/HT CO2 environments. Compared with an environment of air, the elongation to failure of Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys in HP/HT CO2 environments decreased by approximately 30 and 25%, respectively. In addition, tensile strength and elongation to failure of Fe17Cr5.5Ni-based alloys were greater than those of Fe13Cr5Ni-based alloys. Elongation, reduction in area, and time to failure of Fe17Cr5.5Ni-based alloys were found to be much higher than that of Fe13Cr5Ni-based alloys in HP/HT CO2 environments. It can be concluded that Fe17Cr5.5Ni alloys possess better SCC resistance than Fe13Cr5Ni alloys in these environments.

Development Of A Nonmagnetic Drill Collar With High-Stress Corrosion Resistance

1986 ◽  
Author(s):  
T. Nakazawa ◽  
T. Suzuki ◽  
T. Sakamoto ◽  
Y. Yazaki ◽  
Y. Tsukano
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
High Stress ◽  
Stress Corrosion Resistance ◽  
Drill Collar
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