BHN硬度简介

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1、TheBrinellhardnesstestiscommonlyusedtodeterminethehardnessofmaterialslikemetalsandalloys.Thetestisachievedbyapplyingaknownloadtothesurfaceofthetestedmaterialthroughahardenedsteelballofknowndiameter.Thediameteroftheresultingpermanentimpressioninthetestedmetali

2、smeasuredandtheBrinellHardnessNumberiscalculatedasBHN=2P/(πD(D-(D2-d2)1/2))(1)whereBHN=BrinellHardnessNumberP=loadontheindentingtool(kg)D=diameterofsteelball(mm)d=measurediameterattherimoftheimpression(mm)Itisdesirablethatthetestloadarelimitedtoaimpressiondia

3、meterintherangeof2.5to4.75mm.ApproximateloadsandBrinellHardnessNumbers:BrinellHardnessNumberLoad(kg)160-600300080-300150026-100500TypicalBrinellHardnessNumbersforMetalsMaterialBrinellHardnessNumberSoftbrass60Mildsteel130Annealedchisselsteel235Whitecastiron415

4、Nitridedsurface750SteelHardnessversusStrengthBrinellVickersRockwellEquivalentRmImpressionDiameter(mm)HardnessHBHardnessHVHardnessBHardnessC(tonf/in2)(kgf/mm2)(N/mm2)2.50601640-57.0---2.55578615-56.0---2.6055559112054.5---2.6553456911953.5---2.7051454711952.0-

5、--2.7549552811751.0---2.8047750811749.5---2.8546149111648.510116015692.9044447411547.09815515202.9542945511545.59515014713.0041544011444.59214514223.0540142511343.08813913633.1038841011242.08513413143.1537539611240.58212912653.2036338311039.08012612363.253523

6、7211038.07712111873.3034136010936.57511811573.3533135010935.57311411183.4032133910834.57111110893.4531132810833.06810710493.5030231910732.06610410203.5529330910631.0641019903.6028530110530.063999713.6527729210429.061969413.7026928410427.559939123.752622761032

7、6.558918923.8025526910225.556898733.8524826110224.055878533.9024125310023.053848243.952352479922.051817944.002292419820.550797754.0522323597-49777554.1021722896-48767454.1521222396-46737164.2020721895-45716964.3019720893-43686674.4018719791-41656374.501791898

8、9-39626084.6017017987-36575594.7016317285-35555394.8015616583-34545304.9014915781-32515005.0014315079-31494815.1013714477-31494815.2013113874-30474615.3012613372-29464515.4012112770-28444