API 11AX Tungsten Carbide Valve Seats and Valve Balls / YG 13 valve balls and valve seats / tungsten carbide blank balls and seat blanks

valve balls main specifications  for reference:

Size	Ball   Diameter (in)	API   Symbol
106	5/8	V11-106
	9/16	ALT
125	3/4	V11-125
	11/16	ALT
150	15/16	V11-150
	7/8	ALT
175	1-1/8	V11-175
	1	ALT
200	1-1/4	V11-200
	1-1/8	ALT
225	1-3/8	V11-225
	1-1/4	ALT
250	1-11/16	V11-250
	1-1/2	ALT
325	2	V11-325
375	2-1/4	V11-375
	2

main material  for reference:

Symbol	Symbol	Hardness	Material
A1	Stainless Steel	Ball: HRC 58-65 Seat: HRC 52-56	UNS 41000–UNS 44000
B1	Cobalt Alloy, Cast	Ball: HRC 56-63 Seat: HRC 50-56	Cobalt, chromium, and tungsten alloy
B2	Cobalt Alloy, Powder Metal	Ball: HRC 53-60 Seat: HRC 51-57	Cobalt, chromium, and tungsten alloy
C1	Tungsten Carbide	Ball: HRA 88-89 Seat: HRA 88-89.5	Tungsten with Cobalt binder
C3	Titanium Carbide	Ball: HRA 89-90.5 Seat: HRA 89-90.5	Tungsten and titanium carbide with cobalt binder