Rockwell Hardness

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What is a Brinell Hardness tester and a rockwell Hardness tester?

these are used to measure the hardness of a metal
description of the device.

Rockwell:
The general Rockwell test procedure is the same regardless of the Rockwell scale or indenter being used. The indenter is brought into contact with the material to be tested, and a preliminary force (formally referred to as the minor load) is applied to the indenter. The preliminary force is usually held constant for a set period of time (dwell time), after which the depth of indentation is measured. After the measurement is made, an additional amount of force is applied at a set rate to increase the applied force to the total force level (formally referred to as the major load). The total force is held constant for a set time period, after which the additional force is removed, returning to the preliminary force level. After holding the preliminary force constant for a set time period, the depth of indentation is measured a second time, followed by the removal of the indenter from the test material. The measured difference between the first and second indentation depth measurements, "h", is then used to calculate the Rockwell hardness number.

Brinell:
Brinell hardness is determined by forcing a hard steel or carbide sphere of a specified diameter under a specified load into the surface of a material and measuring the diameter of the indentation left after the test.The Brinell hardness number, or simply the Brinell number, is obtained by dividing the load used, in kilograms, by the actual surface area of the indentation, in square millimeters.The result is a pressure measurement, but the units are rarely stated .

The Brinell hardness test uses a desk top machine to press a 10mm diameter, hardened steel ball into the surface of the test specimen. The machine applies a load of 500 kilograms for soft metals such as copper, brass and thin stock. A 1500 kilogram load is used for aluminum castings, and a 3000 kilogram load is used for materials such as iron and steel. The load is usually applied for 10 to 15 seconds. After the impression is made, a measurement of the diameter of the resulting round impression is taken. It is measured to plus or minus .05mm using a low-magnification portable microscope. The hardness is calculated by dividing the load by the area of the curved surface of the indention, (the area of a hemispherical surface is arrived at by multiplying the square of the diameter by 3.14159 and then dividing by 2). To make it easier, a calibrated chart is provided, so with the diameter of the indentation the corresponding hardness number can be referenced. A well structured Brinell hardness number reveals the test conditions, and looks like this, "75 HB 10/500/30" which means that a Brinell Hardness of 75 was obtained using a 10mm diameter hardened steel with a 500 kilogram load applied for a period of 30 seconds. On tests of extremely hard metals a tungsten carbide ball is substituted for the steel ball. Among the three hardness tests discussed, the Brinell ball makes the deepest and widest indentation, so the test averages the hardness over a wider amount of material, which will more accurately account for multiple grain structures, and any irregularities in the uniformity of the alloy.

The Brinell hardness test was one of the most widely used hardness tests during World War II [7]. For measuring Armour plate hardness the test is usually conducted by pressing a tungsten carbide sphere 10mm in diameter into the test surface for 10 seconds with a load of 3,000kg, then measuring the diameter of the resulting depression.

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Newage Versitron Regular Rockwell Hardness Tester AT130 RDS
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Bench Top Rockwell Hardness Tester HR 150 A Testing Table Test Block HRC HRA B
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NEW Wilson Rockwell Hardness tester 1 8 Ball chuck indenter penetrator indentor
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Wilson Rockwell Hardness Test Block 99 Inv21771
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Rockwell Hardness Tester Stepped Anvil 3 4 Shank See description for dimensio
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Rockwell HR 150A Hardness Tester 150 Lbs Max Load 67H Max Test W Accessories
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Newage Versitron Superficial Rockwell Hardness Tester AT130 SRDS ND35
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Hardness Tester Rockwell Type HR 150A 150 Max Load Testing Table Test Block
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ROCKWELL HARDNESS TEST BLOCK 15T  715 + 15
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PHBR 2 Portable Brinell  Rockwell Hardness Tester
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PHBR 8 4 Large Brinell  Rockwell Hardness Tester
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Made in USA Rockwell B Scale Hardness Calibration Test Block B90 Hardness H
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SERRATED DISC CAP WITH 3 1032 TAPPED HOLES ON BACK SIDE ROCKWELL HARDNESS TESTER
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ROCKWELL HARDNESS TESTER MODEL 3 JR WILSON
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New Metal Steel Diamond Indenter Penetrator For Rockwell Hardness Testing Tester
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Newage Indentron NT200R Rockwell Hardness Tester
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Steel Diamond Penetrator Indenter + Box For Rockwell Hardness Testing Tester
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Rockwell Superficial Vintage Hardness Tester Mdl 5JS
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DIGITAL Portable Rockwell Hardness Tester Rams Rockford model 300 DTR
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Brand new Portable Rockwell Hardness Tester C Clamp small Hardness Meter PHR 4 3
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used Wilson Rockwell Cylindron Jr Anvil 1 4 IN Larger Hardness Tester w flat
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Rockwell Wilson Hardness Tester Model 3 JR  G 138
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MASTERCRAFT 60 pc Rockwell Hardness Steel SAE  Metric Tap  Die Set Metal Case
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Rockwell Type Hardness Tester HR 150A 150 Max Load Testing Table Test Block
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Diamond Rockwell HRC 3 Indenter for Hardness Tester Diamond Indenter 120 Degree
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Rockwell HR 150A Dial Hardness Tester ABC Scale Bench Top For Parts Repair
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Made in USA Rockwell C Scale Steel Hardness Calibration Test Block C62 Hard
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