Understanding of abrasive hardness, carbides and wear resistance

About hardness, carbides and wear resistance?

1. Hardness directly reflects the wear resistance of the product, the higher the wear resistance, the higher the hardness, with the Rockwell hardness “HRC“.

2. Hardness is the most important index to distinguish whether the ball is good or bad. Without high-temperature quenching, the ball does not have good wear resistance. Generally, the hardness of the cast lapping body is between 45-54 HRC and 60-68 HRC after heat treatment and quenching, that is to say, the hardness of the lapping body is above 58 degrees HRC.

3. Carbides are the backbone and support of hardness, which is equivalent to the human skeleton. The more carbides, the higher hardness;

Carbide amount (%)12.33(c%) + 0.55(CR%)-15.2

EXAMPLE: hardness is like reinforced concrete, the hardness with carbides is like thicker, firmer reinforced concrete.

The hardness of the forged steel ball after heat treatment is similar to that of the cast high chromium ball. The wear resistance is not equal to that of the cast high chromium ball, because the forged steel ball has no carbide support at all

WEAR RESISTANCE CONTRAST: Forged Steel Ball, Cast Steel Ball

All cast steel ball, low chromium ball wear resistance, carbide least, followed by medium chromium ball, ordinary high chromium ball than medium chromium ball wear, high chromium ball than ordinary high chromium ball wear;

WEAR RESISTANCE CONTRAST: Low Chromium Ball high chromium ball (CR10%) high chromium ball (CR11%-30%)

CONCLUSION:

After strict heat treatment quenching, tempering, to use the required product hardness, and ensure that the number of carbides, wear products can be guaranteed. The higher the hardness, the better the wear resistance; the more the number of carbides, the better the wear resistance. The same hardness, the number of different carbides, different wear resistance.

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