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copper alloy

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046469
EISBN: 978-1-62708-229-7
... Abstract After about 17 years in service, copper alloy C27000 (yellow brass, 65% Cu) innercooler tubes in an air compressor began leaking cooling water, causing failure and requiring replacement. The tubes were 19 mm in diam and had a wall thickness of 1.3 mm (0.050 in.). The cooling water...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048714
EISBN: 978-1-62708-229-7
... Abstract Tubes in heat exchangers, made of copper alloy C44300 and used for cooling air failed after 5 to six years of service. Air passed over the shell-side surface of the tubes and was cooled by water flowing through the tubes. Water vapor in the air was condensed (pH 4.5) on the tube...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091694
EISBN: 978-1-62708-220-4
... Abstract Tube sheets (found to be copper alloy C46400, or naval brass, and 5 cm (2 in.) thick) of an air compressor aftercooler were found to be cracked and leaking approximately 12 to 14 months after they had been retubed. Most of the tube sheets had been retubed several times previously...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091378
EISBN: 978-1-62708-219-8
.... Recommendations The piping required replacement with a more corrosion-resistant material. Corrosion By-Products Copper alloys with a copper content greater than 85% are resistant to dezincification. Copper alloys such as red brass (UNS C23000), inhibited Admiralty brass (UNS C44300), and arsenical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0091690
EISBN: 978-1-62708-234-1
... Abstract A substantial number of copper alloy C27000 (yellow brass, 65Cu-35Zn) ferrules for electrical fuses cracked while in storage and while in service in paper mills and other chemical processing plants. The ferrules, made by three different manufacturers, were of several sizes. One...
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Published: 01 January 2002
Fig. 5 Copper alloy C70600 tube from a hydraulic-oil cooler. The cooler failed from crevice corrosion caused by dirt particles in river water that was used as a coolant. (a) Inner surface of hydraulic-oil cooler tube containing a hole (arrow A) and nodules (one of which is indicated by arrow B More
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Published: 01 January 2002
Fig. 6 Copper alloy C26000 steam-turbine condenser tube that failed by dezincification. (a) Section through condenser tube showing dezincification of inner surface. 3 1 2 ×. (b) Etched specimen from the tube showing corroded porous region at the top and unaffected region below. 100× More
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Published: 01 January 2002
Fig. 8 Copper alloy C44300 heat-exchanger tube that failed by impingement corrosion from turbulent flow of air and condensate along the shell-side surface. (a) Shell-side surface of tube showing damaged area. (b) Damaged surface showing ridges in affected area. 4×. (c) Unetched section through More
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Published: 01 January 2002
Fig. 14 Comparison of SCC and corrosion fatigue cracks in copper alloy C26000 (cartridge brass, 70%). (a) Typical intergranular stress-corrosion cracks in tube that was drawn, annealed, and cold reduced 5%. The cracks show some branching. H 4 OH plus H 2 O etch, 150×. (b) Typical transgranular More
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Published: 01 January 2002
Fig. 43 SEM view of laboratory fatigue fracture of a 70-30 nickel-copper alloy showing mixed intergranular and transgranular morphology. Source: Ref 24 More
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Published: 30 August 2021
Fig. 5 Copper alloy C70600 tube from a hydraulic-oil cooler. The cooler failed from crevice corrosion caused by dirt particles in river water that was used as a coolant. (a) Inner surface of hydraulic-oil cooler tube containing a hole (arrow A) and nodules (one of which is indicated by arrow B More
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Published: 30 August 2021
Fig. 6 Copper alloy C26000 steam-turbine condenser tube that failed by dezincification. (a) Section through condenser tube showing dezincification of inner surface. Original magnification: 3.5×. (b) Etched specimen from the tube showing corroded porous region at the top and unaffected region More
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Published: 30 August 2021
Fig. 8 Copper alloy C44300 heat-exchanger tube that failed by impingement corrosion from turbulent flow of air and condensate along the shell-side surface. (a) Shell-side surface of tube showing damaged area. (b) Damaged surface showing ridges in affected area. Original magnification: 4×. (c More
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Published: 01 June 2019
Fig. 1 Electroless nickel underplating and gold plating on a copper alloy CDA175 module retaining clip. (a) shows a good plated clip and (b) shows a bad clip with copper oxide (black layer) at the copper/alloy nickel plating interface, where the separation occurred. More
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Published: 01 June 2019
Fig. 1 Copper alloy C44300 heat-exchanger tube that failed by impingement corrosion from turbulent flow of air and condensate along the shell-side surface. (a) Shell-side surface of tube showing damaged area. (b) Damaged surface showing ridges in affected area. 4×. (c) Unetched section through More
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Published: 01 June 2019
Fig. 1 Copper alloy C27000 (yellow brass, 65% Cu) air-compressor innercooler tube that failed by dezincification. (a) Unetched longitudinal section through the tube. (b) Micrograph of an unetched specimen showing a thick uniform layer of porous, brittle copper on the inner surface of the tube More
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Published: 01 June 2019
Fig. 1 Copper alloy C70600 tube from a hydraulic-oil cooler. The cooler failed from crevice corrosion caused by dirt particles in river water that was used as a coolant. (a) Inner surface of hydraulic-oil cooler tube containing a hole (arrow A) and nodules (one of which is indicated by arrow B More
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Published: 01 December 2019
Fig. 9 Golden-yellow color copper-alloy streaks on pipe OD surface More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046737
EISBN: 978-1-62708-229-7
... Abstract After 14 months of service, cracks were discovered in castings and bolts used to fasten together braces, posts, and other structural members of a cooling tower, where they were subjected to externally applied stresses. The castings were made of copper alloys C86200 and C86300...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001447
EISBN: 978-1-62708-235-8
... Abstract Hydrogen embrittlement is the brittleness affecting copper and copper alloys containing oxygen which develops during heat treatment at temperatures of about 400 deg C (752 deg F) and above in an atmosphere containing hydrogen. The phenomenon of hydrogen embrittlement of copper and its...