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Comparison of Oscillography Impact Properties between a New Type Drilling Collar Steel and 4145H
Abstract:
Average impact energy of 4145H steel and X new type drilling collar steel satisfied the standard of “SYT5144-2007 Drilling collar” and “API SPEC7”. With temperature getting down, impact energy of 4145H steel decreased, impact energy Cof X drilling collar steel is a lot higher than 4145H steel, crack propagation energy and crack propagation energy/impact energy ratio decreased. Lower temperature leads to higher crack propagation rate. The crack propagation energy of 4145H is lower than X drilling collar steel. The crack propagation energy/impact energy ratios of X drilling collar steel are at least 3% higher than 4145H for different temperature. In drilling, crack growth rate in X DC was slower than 4145H DC, crack growth rate was fast, and the DC was easy to fracture in low temperature
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435-438
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February 2012
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© 2012 Trans Tech Publications Ltd. All Rights Reserved
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