Some knowledge about hardness of steel shot

- Nov 09, 2017 -

Steel shot blasting machine is used to complete the entire process, known as shot blasting, blasting is the use of high-speed rotating impeller pills for the small steel or iron casting out high speed impact parts surface, so it can remove the oxide layer on the surface of the parts.


Pills for steel or iron, at the same time high speed impact parts surface, cause the deformation of lattice distortion on the surface of the parts, the surface hardness is higher, it is a kind of method to clean the surface of the metal parts, casting surface blasting are commonly used to clean up, or to strengthen the part surface.


The implications of rockwell hardness: under the prescribed loads, steel shot or diamond indenter vertical pressure into the surface of the specimen, indentation, test indentation depth, the formula using rockwell hardness HR = (K H)/C rockwell hardness can be calculated.Simple said is creasing the more shallow, HR value, the greater the material hardness is higher.By "HRC".HRC60, for example, which stands for under the test load of 150 kg, using the apex Angle of 120 degrees of diamond cone head, indentation depth of the specimen is 0.08 mm.


Steel shot hardness, there are three kinds of the most commonly used indicators: brinell hardness, rockwell and vickers hardness.The implications of brinell hardness: with a certain diameter of hardened steel pill, under a certain load (p), pressed into the surface of the specimen, stay for a period of time, and then remove the load and measure the area of the indentation, the smaller steel shot indentation resistance plastic deformation ability (i.e., hardness), the greater the hardness is smaller, the greater the represented by "HB".


Brinell hardness implications: is the use of vertex Angle of 136 degrees of diamond square pyramid head, down into the surface of the specimen under certain load, leave the square indentation, according to the length of the diagonal, can be found to hardness value.




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