HARDENED STEEL AND HARD ALLOYS HARDNESS …

1 HARDNESS VS minimum thickness chart 55 RockwellSuperficialHardnessScalesRockwel lRegularHardnessScalesAnygreaterthicknes sandhardnesscanbesafelytestedonindicated scaleThicknessinches(mm)N ( ).008( ).010( ).012( ).014( ).016( ).018( ).020( ).022( ).024( ).026( ).028( ).030( ).032( ).034( ).036( ).038( ).040( ) (mm)1/16in BallIndenter1/16in ( ).012( ).014( ).016( ).018( ).020( ).022( ).024( ).026( ).028( ).030( ).032( ).034( ).036( ).038( ).040( )15-T30-T45-TFBG15kgf30kgf45kgf60kgf100k gf150kgf9186817568 XXXXXXXXXXX--807264554534 XXXXXXXX---7162534331184 XXXXXX-------9891857769 XXXX-------9487807162524028X-------94877 6685950423122X= STEEL AND hard ALLOYS8079787776757473727170696867666564 6362616059585756555453525150494847464544 4342414039383736353433323130292827262524 23222120 CAD15-N30-N45-NHVHKHBKSIWMNG60kgBrale100 kgBrale15 kgNBraleSuperficial30 kgNBrale45 kgNBrale10 kg500 gmandover3000kg10 mmball150kg1/16"ball1000lbs/sq in1000gmVickersKnoopBrinellTensileStreng thMicro-ficialRockwell150kgBrale Note1:A 10mmsteelballwasusedfor450 BHNandbelow.

2 A 10mm carbideballwas :Thetensilestrengthrelationtohardnessis inexact,evenforsteel, unlessit is CONVERSIONCHART10643 S. Norwalk Blvd., Santa Fe Springs, CA 90670 Providing reliable service and consistent workmanship to our customers since 1957 HARDNESS CONVERSIONCHARTSOFT STEEL ,GREY AND MALLEABLE CAST IRONANDMOSTNON-FERROUSMETALST hevaluesshownareapproximateonlyandthisch artis intendedprimarilyasa gmandover3000kg10 kg60kg1/16"ball1000lbs/sq in1000gmKnoop10mmVickers136 TensileStrengthMicroficialRockwell100kg1 /16" "ball60kgBrale100kg1/8"ball60kg1/8"ball1 50kg1/8"ball30 kg1/16"ball15 kg1/16"ball45 kg1/16" kg10 mmball2011951891841791751711671631601571 5415114814514214013713513313012812612412 2120118116114112110109107106104102101999 8969594929190898786858483828180807978777 6757574737272717069696867666665656464636 2626161606059595958585757575656555555545 4545324023422822221621020520019519018518 0176172169165162159156153150147144141139 1371351321301271251231211191171161141121 10108107106104103101100 NABraleDiamondIndenterDiameterofSpecimen -inches(mm)

3 ObservedReading9085807570656055504540353 02520 ScalesC,D, A1/8( )NA1/4( ) (10) (13) (16) (19) (22) (25) (32) (38) BraleDiamondIndenterDiameterofSpecimen-i nches(mm)ObservedReading9085807570656055 50454035302520 Scales15-N,30-N,45-N1/8( ) ( ) (10) (13) (16) (19) (22) (25) (32)NA1/16in BallIndenterDiameterofSpecimen-inches(mm )ObservedReading1009080706050403020100 ScalesB,F, G1/8( )NA1/4( ) (10) (13) (16) (19) (22) (25) (32)NA1-1/2(38)NA1-1/2(38)NA1/16in BallIndenterDiameterofSpecimen-inches(mm )ObservedReading9080706050403020 Scales15-T, 30-T, 45-T1/8( ) ( ) (10) (13) (16) (19) (22) (25) (32)NA1-1/2(38) CORRECTION chart 53 Cylindricalworkcorrectionstobeaddedtoobs erved Rockwellnumberforscalesindicat