SAE

SPECS	Steel Shot	Steel Grit GP	Steel Grit GB	Steel Grit GL	Steel Grit GH
Shape when new	round	angular	angular	angular	angular
Shape in the operating mix	round	round	angular	angular	angular
Sieve analysis	According to standard SAE J 444
Chemical analysis	carbon >= 0.85% ; phosphorus =< 0.05% ; sulfur =< 0.05%
Average analysis - Tukon tester - Knoop diamond point - 1000 g load	Normal 40 - 50 Rc ----------------- Other hardness available	40-50 Rc	50-56 Rc	56-60 Rc	60-66 Rc
- Vickers durometer - 1000g load	390-510 HV ------------------ Other hardness available	390-510 HV	510-610 HV	610-690 HV	>= 700 HV
	On 10 measurements taken halfway across the particle radius.
	Arithmetic mean of absolute values of deviations : =< 3 Rc
Standard deviation	+/- 3 Rc or +/- 40 HV	+/- 3 Rc or +/- 40 HV	+/- 3 Rc or +/- 50 HV	+/- 3 Rc or +/- 60 HV	+/- 3 Rc or +/- 80 HV
Microstructure
Minimum density measured by alcohol displacement	>= 7.3 g/cu.cm.		>= 7.6 g/cu.cm.