What is meant by BHN?

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What is meant by BHN?

BHN = Brinell Hardness Number (kgf/mm2) P = applied load in kilogram-force (kgf) D = diameter of indenter (mm) Brinell hardness is sometimes quoted in megapascals; the Brinell hardness number is multiplied by the acceleration due to gravity, 9.80665 m/s2, to convert it to megapascals.

What is Brinell hardness test used for?

Applications. Brinell hardness testing is typically used in testing aluminum and copper alloys (at lower forces) and steels and cast irons at the higher force ranges.

What is BHN of steel?

Brinell steel hardness test The acronym BHN is used to show a Brinell Hardness Number. The term ‘Brinelling’ has come to mean the permanent indentation of any hard surface. The test involves a large, heavy ball, which is pushed against steel at a predetermined level of force.

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How is BHN measured?

The Brinell hardness number is obtained by dividing the load, in kilograms, by the spherical area of the indentation in square millimetres; this area is a function of the ball diameter and the depth of the indentation.

Is BHN and HB same?

BHN – Brinell Hardness Number, which is the same meaning as HB.

Why Brinell hardness number is called number?

Since Brinell hardness is a mechanical property, it also relates to the material’s resistance to wear as well as plastic or permanent deformation, and the material’s ability to indent or abrade another material. Brinell hardness is named after Johan A. Brinell, a Swedish engineer.

What is difference between Rockwell and Brinell?

The Brinell hardness testing uses a 10mm hardened steel ball, while the Rockwell test uses either a much smaller steel ball (<4mm) or a diamond cone, depending on the material being tested. The Rockwell test measure the depth of the indentation, while the Brinell test measures the width of the indentation.

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Why are cylindrical objects quenched vertically?

After steel is quenched, it is usually very hard and strong but brittle. The quenching velocity of oil is much less than water. To minimize distortion, long cylindrical objects should be quenched vertically, flat sections edgeways and thick sections should enter the bath first.

What is the Brinell hardness of copper?

89

Physical Properties Metric Comments
2.38 g/A/h monovalent
Mechanical Properties Metric Comments
Hardness, Brinell 89 Converted from Vickers for 500 kg load/10 mm ball Brinell test.
Hardness, Rockwell A 35 Converted from Vickers.

How do you convert BHN to HRB?

HB – ball 10 mm, load 29,400N (3000 kgf) durata 15 seconds. BHN – Brinell Hardness Number, which is the same meaning as HB….Formula B – Convert HRB into HB.

Rockwell B Hardness (HRB) Brinell Hardness (HB)
From 55 to 69 HB = 1.646 * HRB + 8.7
From 70 to 79 HB = 2.394 * HRB – 42.7

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