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ISSN: 0090-3973
Published Online: 1 September 1985
Page Count: 15

Creep Behavior of Copper and Copper Alloys As Design Criteria in Pressure Vessel Manufacture
Drefahl K, Kleinau M, Steinkamp W

Abstract
Six materials, copper and copper alloys, have been subjected to long-term creep tests (30 000 h) per DIN 50 118 at a range of 100 to 250°C, except for aluminum bronze which was tested from 150 to 300°C. The following annealed materials were tested: SF-Cu (DIN 1787)equivalent to C 12200, Phosphorus Deoxidized Copper, high residual Phosphorus (Cu-DHP); CuZn39Pb0.5 (DIN 17 660)equivalent to C 33500, low-leaded brass; CuZn20Al2 (DIN 17 660)equivalent to C 68700, aluminum-brass, arsenical; CuZn28Sn1 (DIN 17 660)equivalent to C 44300, Admiralty brass, arsenical; CuZn38SnAl (DIN 17 660), improved Muntz-metal, 60%, not standardized in the United States; and CuAl10Ni5Fe4 (DIN 17 665)similar to C 62730 or C 63000, nickel-aluminum-bronze. The test conditions and the metallurgical history of the materials are described. The minimum value of the 1% creep strain and the average value of creep strength, both temperature and duration dependent, as well as the stress for minimum creep rates of 1% for a given time are also shown. The design criteria for pressure vessels are discussed.

Keywords:
C 12200 (Cu-DHP), C 33500 (low leaded brass), C 44300 (Admiralty brass, arsenical), C 62730 and C 63000 (nickel-aluminum-bronze), C 68700 (aluminum-brass, arsenical), improved Muntzmetal (60%), creep test, minimum creep rate, minimum value of 1% creep strain, average value of creep strength, pressure vessel, design criteria

Paper ID: JTE10959J
DOI: 10.1520/JTE10959J
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