Abstract
Applling Leeb hardness tester D punch, examined the steel hardness by two different ways of clamping method and coupling method respectively, studied the correlation of Leeb hardness and steel strength, compared the research results with related literature and Jiangsu province construction standard of DGJ32/ TJ116-2011. Through the research, the conclusion is larger that this research results and related literature, the reliability is very low which be used to infer steel tensile strength with the D punch testing Leeb hardness .
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