PENGARUH TEMPERATUR ANELING TERHADAP KEKERASAN DAN KEKUATAN PIPA TEMBAGA AC BEKAS

R. N. Akhsanu Takwim, Kris Witono, Pondi Udianto

Abstract


During the installation process, copper pipes for air conditioning will experience a very large deformation due to straightening and bending following the installation path. Hardening strains occur that result in changes in mechanical properties in this case decreases ductility making it difficult to do the connecting process with flaring.
Studies need to be carried out to restore the mechanical properties of copper pipes that have been used, including the heat treatment process on copper pipes, so that used copper pipes have a better benefit value than having to be recycled. The temperature of the heat treatment is varied from 400oC, 500 oC and 600 oC.
Tensile test results show that at annealed temperature of 400 oC has the highest tensile strength of 125.81 N / mm2 and proportional limit stress of 40.52 N / mm2. Whereas in the microhardness test, the highest hardness occurs also at annealed temperature of 400 oC which is equal to 50.8 HV.

Keywords


used copper pipe, mechanical properties, and heat treatment

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References


Anonim, THE COPPER TUBE HANDBOOK. Copper Development Association, 260 Madison Avenue New York, 2010

Anonim, Over View. Copper Development Association, 260 Madison Avenue New York, 2017

C.A. Thompson, W. M. Manganaro dan F.R. Fickett, Institut Nasional Standar dan Teknologi (NIST), International Copper Association, Ltd. oleh Boulder, Colorado, Juli 1990.

Ludvík Kunz ,Mechanical Properties of Copper Processed by Severe Plastic Deformation . Copper Alloys – Early Applications and Current Performance – Enhancing Processes,InTech March, 2012

R. P. Reed, Mechanical Properties Low Temperature Copper and Alloy, NBS Monograph 101, Institute for Materials Research, National Bureau of Standards, Boulder, Colorado 80302.

Thomas Stoebe, Work Hardening and Annealing of Copper, University of Washington, Seattle, WA 2007




DOI: http://dx.doi.org/10.20527/infotek.v20i2.7717

DOI (PDF): http://dx.doi.org/10.20527/infotek.v20i2.7717.g5908

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