Hardness conversion table

Hardness conversion formula:
1.Shore hardness(HS)=Burn type hardness(BHN)/10 12
2.Shaw hardness(HS)=Rockwell hardness(HRC) 15
3.Burn type hardness(BHN)= Locke hardness(HV)
4.Rockwell hardness(HRC)= Burn type hardness(BHN)/10-3

Rockwell hardnessHRCand Brinell hardnessHBDifference and conversion of equal hardness control

Hardness is a performance indicator to measure the degree of hardness of a material. There are many methods of hardness test, the principle is not the same, and the measured hardness value and meaning are not exactly the same. The most common is the static load indentation method hardness test, namely Brinell hardness(HB)Rockwell hardness(HRA,HRB,HRC)Vickers hardness(HV)Shore hardness of rubber plastic(HA,HD)The value of isohardness indicates the ability of the material surface to resist the indentation of hard objects. The most popular Richter hardness (HL), Shore hardness(HS)It belongs to the rebound hardness test, and its value represents the size of the elastic deformation work of the metal. Therefore, hardness is not a simple physical quantity, but a comprehensive performance index reflecting the elasticity, plasticity, strength and toughness of the material.

1Hardness of steel: metal hardness(Hardness)The code name isH. According to different hardness test methods,
●regular said there was Brinell (HB), Rockwell (HRC), Vickers (HV), Richter (HL) Hardness, etc., whereHBandHRCMore commonly used.
●HBA wide range of applications,HRCSuitable for surface high hardness materials, such as heat treatment hardness. The difference between the two ishardness testerThe probe is different, Brinellhardness testerThe probe is a steel ball, and Rockwell.hardness testerThe measuring head is diamond. 
●HV-Suitable for microscopic analysis. Vickers hardness(HV) to120kgThe load and top angle within are136°The diamond square cone indenter is pressed into the surface of the material, and the surface area of the indentation pit of the material is divided by the load value, which is the Vickers hardness value.(HV).
●HLPortablehardness tester, easy to measure, the use of impact ball head impact hardness surface, bounce;1mmThe ratio of the rebound velocity and the impact velocity at the calculation of hardness, formula: Richter hardnessHL = 1000 × VB(Rebound Velocity)/VA/V(impact velocity).

●The most commonly used portable Richterhardness testerWith the Richter (HL) After measurement, it can be converted into: Brinell (HB), Rockwell (HRC), Vickers (HV), Shore (HS) Hardness. Or use the Richter principle directly with Brinell (HB), Rockwell (HRC), Vickers (HV), Richter (HL), Shore (HS2) Measure the hardness value.

Rockwell hardness(HRC)It is generally used for materials with higher hardness, such as hardness after heat treatment, etc.

2,HB - Brinell hardness: Generally used when materials are soft, such as non-ferrous metals, steel before heat treatment or after annealing. Cloth hardness(HB)Is a certain size of the test load, a certain diameter of hardened steel ball or carbide ball pressed into the measured metal surface, keep the specified time, and then unloading, measuring the measured surface indentation diameter. The cloth hardness value is the quotient of the load divided by the indentation spherical surface area. Generally: with a certain load(General3000kg)put a certain size(The diameter is generally10mm)The hardened steel ball is pressed into the surface of the material and kept for a period of time. After the load is removed, the ratio of the load to its indentation area is the Brinell hardness value.(HB), in kilograms of force/mm2 (N/mm2).

3Rockwell hardness is an index of hardness value determined by indentation plastic deformation depth. to0.002mm as a unit of hardness. WhenHB>450Or if the sample is too small, the Brinell hardness test cannot be used instead of the Rockwell test.hardness testerAmount. It is made with a top corner120°of a diamond cone or a diameter1.59,3.18mmThe steel ball is pressed into the surface of the measured material under a certain load, and the hardness of the material is calculated from the depth of the indentation. According to the different hardness of the test material, it is divided into three different scales:

HRA: is adopted60kgHardness determined by load and diamond cone presser for extremely hard materials(Such as hard alloy).

HRB: is adopted100kgLoad and diameter1.58mmHardened steel balls, obtained hardness, for materials with lower hardness(Such as annealed steel, cast iron, etc.).

HRC: is adopted150kgHardness determined by load and diamond cone presser for very hard materials(Such as hardened steel).
In addition: