Hardness unit of Q235B Spiral Steel Pipe for Oil

2017-05-03 08:58:03 COMMENT：0 HITS：

　　With a certain diameter of the ball or carbide ball, with a specified test force (F) pressed into the surface of the sample, after a specified time to remove the test force to measure the surface indentation diameter (L). The Brinell hardness value is the quotient of the test force divided by the indentation spherical surface area. In HBS (steel ball), said unit is N / mm2 (MPa).

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