Production Standard for Cast Steel Grit

1.GB/T18838.3-2008:Preparation of steel substrates before application of paints and related products specifications for metallic blast-cleaning abrasives-Part 3: High -carbon cast-steel shot and grit.
2.SFSA Designation:20-66
3.SAE J1993:High Carbon Steel Grit
4.YB/T5150-1993:Cast steel grit
5.MIL-S-851C:Military Specification:Steel Grit,Shot,And Cut Wire Shot;And Iron Grit And Shot-Blast Cleaning and Peening.
6.ISO11124 Part 3:High-carbon cast-steel shot and grit.






Technical date:
Chemical composition:Carbon 0.70-1.20%
Manganese 0.35-1.20%
Silicon 0.40-1.20%
Sulfur ≤0.05%
Phosphorous ≤0.05%
Average hardness (tested at the load of 500g):
GP steel grit :42-50HRC(399-509HV)
GL steel grit :56-56HRC(620-713HV)
GL steel grit: 63-66HRC(759-889HV)
Max.hardness deviation: ±3.0HRC（±40HV）
Microstructure:Uniform tempered martensite,or tempered tro