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About a few knowledge of hardness
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About a few knowledge of hardness Convention expresses to have cloth family name (HB) , Rockwell (HRC) , Vickers (HV) , in family name (HL) hardness, reach HRC with HB among them relatively commonly used.

Range of ● HB application is wider, the condition that offer money is commonly used, cu, Al is usable also. HRC applies to material of token tall hardness, wait like heat treatment hardness. Both distinction depends on sclerometer measure a head to differ, of sclerometer of cloth family name measure a ball that it is steel, and Rockwell hardness plan measure a head to be diamond.

● falls in certain condition, HB and HRC are OK crossing-over. Its conversion formula can write down probably for: 1HRC≈1/10HB.

● HV- is applied to show differential analyse, cu, Al is usable also.

● HL- is portable sclerometer, measure convenient, but have a demand to sample ply.

Cloth pattern hardness is the experiment load with certain size, the ball of hard steel of temper by dipping in water of will certain diameter or hard alloy ball press face of the metal that be measured, hold formulary time, next discharge carries on his shoulder or back, measure diameter of impress of the surface that be measured. Value of cloth pattern hardness is load divides the business that with impress round face accumulates income.

Hardness of type of the name of a river in Shaanxi and Henan provinces is with impress plasticity is out of shape deepness will decide hardness is worth index. Regard a hardness as the unit with 0.002 millimeter.

1.HRC implication is staff guage of C of hardness of type of the name of a river in Shaanxi and Henan provinces,

HB implication is cloth pattern hardness.

2.HRC and HB the application of aborning is very wide

HRC 20 of 3.HRC suitable scope - - 67, be equivalent to HB225 - - 650

If hardness uses HRA of staff guage of A of hardness of type of the name of a river in Shaanxi and Henan provinces high at this limits.

If hardness uses HRB of staff guage of B of hardness of type of the name of a river in Shaanxi and Henan provinces under this limits.

Upper limit of cloth pattern hardness is worth HB650, cannot be worth high hereat.

4. Rockwell hardness plan the pressure head of C staff guage is vertex angle 120 degrees diamond is conic, experiment load is one certain value, chinese standard is 150 kilograms of force.

The pressure head of sclerometer of cloth family name is ball of hard steel of temper by dipping in water (HBS) or hard alloy ball (HBW) , experiment load differs along with ball diameter and differ, from 3000 to 31.25 kilograms of force.

Impress of hardness of type of 5. the name of a river in Shaanxi and Henan provinces is very small, measured value has local sex, need the dot that measure number to beg average, applicable finished product and chip,

Impress of cloth pattern hardness is bigger, measured value is exact, not applicable finished product and chip, do not be attributed to nondestructive to detect commonly a kind.
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