Method for measuring P91 steel weld brinell hardness

The invention discloses a method for measuring P91 steel weld brinell hardness. The method comprises the following steps: (1) welding P91 steel, and adjusting a heat treatment temperature and a heat preservation time to prepare test specimens with different brinell hardness values; (2) respectively detecting the Leeb hardness value HL and the brinell hardness value HB of each test specimen weld prepared in the step (1) by using a Leeb hardness tester and a Brinell hardness tester; (3) with the brinell hardness value of the test specimen with the tested hardness as a horizontal coordinate and the Leeb hardness value as a vertical coordinate, establishing an HB-HL hardness correlation curve to obtain a linear relation; (4) selecting a P91 steel weld region to be measured, measuring the Leeb hardness of the P91 steel weld region to be measured by using a portable Leeb hardness tester so as to obtain the Leeb hardness value according to the linear relation in the step (3). The method disclosed by the invention can be used for accurately detecting the brinell hardness value of the P91 steel weld and providing forceful guarantee for the safe operation of boilers.