When maintaining the integrity of the ball finish in a corrosive environment is important, choose from our quality stainless steel balls, which are being manufactured for such applications as bearings, bicycle parts, casters and wheels, etc. Stainless Steel balls that we are manufacturing are in general classified into two representative groups viz., high chrome (martensitic) and high chrome-nickel (austenitic) stainless steels.
Martensitic Stainless Steel Balls The stainless steel (>12% Cr) of this type is used with the martensitic balls when the desired corrosion resistance is rather inferior, but better mechanical properties are required as compared with the austenitic stainless steel. This feature makes them especially useful for ball bearings and valve applications.

Type	Feature		Chemical Composition					Hardness  Quenched & Tempered	Tensile Strength  kgf/mm2	Specific Weight gf/cm3
AISI			Cu	Ni	Cr	Mo	Mn
410	13 Cr - low C	Corrosion and heat resistant	0.15	-	12.5	-	-	HB380 - 400	55	7.75
416	13 Cr - S	General use	0.15	-	13.0	-	<1.25		55
420	13 Cr - medium C	High Hardness, Corrosion and heat resistant	0.21	-	13.0	-	-	HB500 - 550	65
420 F	13 Cr - high C		0.33	-	13.0	-	-		75
430 F	18 Cr - high S		0.12	-	17.0	-	-	-	46
440 B	18 Cr - Mo-0.8C	For Ball Bearing	0.85	-	17.0	-	-	HRC 55 - 62	75
440 C	18 Cr - Mo-1.0C		1.10	-	17.0	-	-	HRC 58 - 65	75

Austenitic Stainless Steel Balls The non-magnetic high chrome-nickel stainless steel with the austenite structure shows no quench hardenability. However, it is featured with high toughness, good corrosion resistance and remarkable mechanical properties at high and low temperature. The balls made of them are widely used for valves and the related equipments. Type Feature Chemical Composition Hardness  HRC Tensile Strength  kgf/mm2 Specific Weight gf/cm3 AISI C Ni Cr Mo Ti 302 18 Cr - 8Ni - high C General Use 0.15 9.0 18.0 - - 25-39 53 7.93 304 18 Cr - 8Ni General Use 0.08 9.5 19.0 - - 53 316 18 Cr - 12 Ni - 2.5 Mo High Corrosion and Creep Resistance 0.08 12.0 17.0 2.5 - 53 7.98 316 L 18 Cr - 12 Ni - 2.5 Mo Trace C - 0.03 14.0 17.0 2.5 - - 49 Size and Precision Class Type Size AFBMA Grade Martensitic Stainless Steel Balls 410, 416 1/8" - 1/2" Grade 10,16, 24, 48, 100, 200 420J1, 420J2 1/8" - 1/2" Grade 16, 24, 48, 100, 200     Duplicated Tolerance Allowed in DIN and TGL   440B, 440C Refer to Size and Precision for AISI 52100 Austenitic Stainless Steel Balls 302, 304 2.00 - 1/2" Grade 100, 200, 500 316, 316 L 2.00 - 1/2" Grade 100, 200, 500     440 C Stainless Steel Balls for Miniature Bearings The technical innovations in a variety of industrial fields such as computers, instruments, watches, etc. have initiated the rapid growth of miniature bearings for which the corrosion resistance is required. Our intensified research works including the unique passivation process are guaranteeing high precision, long durability and good surface quality of our stainless steel balls for miniature bearings.