Steel shot selection criteria:
(1) Appropriate hardness
(2) Sufficient density
(3) Appropriate metallographic structure
Requirements for steel shot:
(1) Fast cleaning
(2) Stable quality
(3) Low consumption
Relationship between hardness and cleaning effect:
Moderate hardness when the hardness is too high and too low
Relationship between hardness and elasticity:
Moderate hardness when the hardness is too high and too low
Relationship between density and life:
The air hole is cracked and the internal shrinkage hole is sound
(1) The hardness is proportional to the cleaning speed, but inversely proportional to the service life. Therefore, the hardness is high, the cleaning speed is fast, but the service life is short and the consumption is large. Therefore, the hardness should be moderate (about HRC40-50 is appropriate) to produce the most economic effect.
(2) With moderate hardness and excellent resilience, each corner can be fully cleaned during spraying and polishing to reduce processing time.
(3) The internal defects of projectiles, such as air hole cracking and shrinkage cavity, can affect their service life and increase consumption.
(4) If the density is greater than 7.4g/cm3 # stainless steel shot #, the internal defects will be minimized.
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