Abstract
In this paper, the Brinell hardness tester and the Leeb hardness tester are used to test the hardness of the welded joints of P92 steel under different heat treatment conditions. A new conversion relationship between Brinell hardness and Leeb hardness of the welded joints of P92 steel is obtained by data fitting. The results show that the Brinell hardness of welded joints of P92 steel obtained from the original conversion relationship of the Leeb hardness tester is lower than that of the actual ones, because the chemical composition, microstructure and strengthening mechanism of P92 steel are obviously different from those of the low-carbon steel, low-alloy steel and cast steel. The new conversion relationship can accurately characterize the hardness of P92 steel components, solve the problem of the accuracy of the existing Leeb hardness tester to characterize this kind of material, and provide an accurate basis for the welding process and metal supervision of materials for ultra-supercritical units.
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