Condenser Tube Materials for Seawater Service

1966 ◽  
Vol 88 (4) ◽  
pp. 410-414 ◽  
Author(s):  
R. B. Niederberger
Keyword(s):  
Stainless Steels ◽  
Crevice Corrosion ◽  
Nickel Alloys ◽  
Maximum Velocity ◽  
Condenser Tube ◽  
Copper Nickel

The results of a series of investigations to assess the performance of a variety of alloys in small experimental condenser configurations at seawater velocities of 10 to 20 fps are summarized. They demonstrate that the addition of 1 percent aluminum increases the maximum velocity limits of copper-nickel alloys to 12–15 fps. Stainless steels, nickel alloys, and titanium are satisfactory for use at velocities of 20 fps, but many of these would be susceptible to pitting and/or crevice corrosion under stagnant conditions.

Chromium Modified Copper-Nickel Alloys for Improved Seawater Impingement Resistance

1973 ◽  
Vol 95 (2) ◽  
pp. 132-135 ◽  
Author(s):  
D. B. Anderson ◽  
F. A. Badia
Keyword(s):  
Corrosion Resistance ◽  
Nickel Alloys ◽  
Tube Flow ◽  
Condenser Tube ◽  
Copper Nickel ◽  
Improved Performance ◽  
Flow Velocities

Two chromium modified copper-nickel alloys have been developed which provide exceptional levels of impingement corrosion resistance in flowing seawater systems. The new alloys retain all the unique characteristics which make the copper-nickel alloys particularly attractive for condenser tube applications. In addition, they provide improved performance capabilities at normal condenser tube flow velocities and significantly increase the upper velocity limit at which copper-nickel alloys can be used effectively.

COPPER ALLOY No. C72200

Alloy Digest ◽  
1982 ◽  
Vol 31 (12) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Heat Exchanger ◽  
High Resistance ◽  
Copper Alloy ◽  
Nickel Alloys ◽  
Salt Water ◽  
Heat Treating ◽  
Condenser Tube ◽  
Copper Nickel

Abstract Copper Alloy No. C72200 was developed to improve on the performance of the copper-nickel condenser tube alloys. It is essentially 85-15 copper-nickel with additions of 0.8% iron, 0.5% chromium and 0.5% manganese. It has exceptionally high resistance to erosion and corrosion by flowing seawater. Its strength and other mechanical properties are similar to the older copper-nickel alloys (90-10 and 70-30). Alloy C72200 is used primarily for condenser and heat-exchanger tubing using seawater and for salt-water piping. 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: Cu-449. Producer or source: Copper and copper alloy mills.

REMANIT 4439

Alloy Digest ◽  
1993 ◽  
Vol 42 (11) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Crevice Corrosion ◽  
Heat Treating ◽  
Corrosion Resistant Steel ◽  
Resistant Steel ◽  
Low Carbon ◽  
Corrosion Resistant ◽  
Mechanical Properties And Corrosion

Abstract REMANIT 4439 is a highly corrosion resistant steel with low carbon content, an addition of nitrogen to enhance both mechanical properties and corrosion resistance, and higher molybdenum than most stainless steels to resist pitting and crevice corrosion in chloride media. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-556. Producer or source: Thyssen Stahl AG.

Detecting Critical Crevice Temperature for Duplex Stainless Steels in Chloride Solutions

CORROSION ◽  
2011 ◽  
Vol 67 (2) ◽  
pp. 025004-1-025004-7 ◽  
Author(s):  
D. Han ◽  
Y. Jiang ◽  
B. Deng ◽  
L. Zhang ◽  
J. Gao ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Crevice Corrosion ◽  
Electrochemical Method ◽  
Duplex Stainless Steels ◽  
Good Reproducibility ◽  
X Ray ◽  
Initiation Step ◽  
Critical Pitting Temperature ◽  
Preferential Dissolution ◽  
Scanning Electron

Abstract A simple and rapid electrochemical method for the evaluation of crevice corrosion in duplex stainless steels (DSS) is described. Three types of DSS—namely, UNS S32101, UNS S31803, and UNS S32750—were tested in 1 mol/L sodium chloride (NaCl) solutions. Results showed good reproducibility with a typical standard deviation of below 3°C. The critical pitting temperature (CPT) for the same specimens was also investigated in 1 mol/L NaCl solutions. An approximately 20°C decrease from CPT to critical crevice temperature (CCT) was observed and subsequently explained. Then, the morphologies of crevice corrosion were studied using scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDS) method. The SEM/EDS study revealed that the ferrite phase was the site where preferential dissolution took place at the initiation step of crevice corrosion, which was in accordance with the prediction by calculating the critical crevice index. Moreover, repassivation was detected with the development of crevice corrosion. The reason was clarified by combining the results obtained with a successful diffusion model, and eventually the crevice corrosion progress was illustrated schematically.

scholarly journals Crevice Corrosion Behavior of Nitrogen Bearing Austenitic Stainless Steels

1999 ◽  
Vol 48 (3) ◽  
pp. 169-175 ◽  
Author(s):  
Alberto A. Ono ◽  
Tadashi Shinohara ◽  
Shigeo Tsujikawa
Keyword(s):  
Corrosion Behavior ◽  
Stainless Steels ◽  
Crevice Corrosion ◽  
Austenitic Stainless Steels

scholarly journals Segregation of copper to the surface of copper-nickel alloys

1984 ◽  
Vol 30 (12) ◽  
pp. 7278-7280 ◽  
Author(s):  
P. A. Dowben
Keyword(s):  
Nickel Alloys ◽  
Copper Nickel
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