Stainless Steel Balls

Stainless Steel Balls

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 steels (>12% Cr) of this type are provided with the martensite structure when quenched and their corrosion resistance is rather inferior, but better mechanical properties, as compared with the austenitic stainless steels. This feature makes them especially useful for ball bearings and valve applications.

Type AISI	Feature		Chemical Composition					Hardness Quenched & Tempered	Tensile Strength kgf/mm2
			Cu	Ni	Cr	Mo	Mn
410	13 Cr - Low C	Corrosion and heat resistant, General Use	0.15		12.5			HB380 - 400	55
416	13 Cr - S	Corrosion and heat resistant, 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	High Hardness, Corrosion and heat resistant	0.33		13.0				75
430 F	18 Cr - High S		0.12		17.0				46
440 B	18 Cr - Mo - 0.8 C	For Ball Bearing	0.85		17.0			HRC 55 - 62	75
440 C	18 Cr - Mo - 1.0 C	For Ball Bearing	1.10		17.0			HRC 58 - 65	75

Austenitic Stainless Steel Balls

The non-magnetic high chrome-nickel stainless steels with the austenite structure are showing no quench hardenability, however, 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 AISI	Feature		Chemical Composition						Hardness HRC		Tensile Strength kgf/mm2		Specific Weight gf/cm3
			C	Ni	Cr	Mo	Ti
302	18 Cr - 8 Ni - High C	General Use	0.15	9.0	18.0			25-39		53		7.93
304	18 Cr - 8 Ni	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
321	18 Cr - 8 Ni - Ti	Corrosion resistant at High Temperature	0.08	11.0	18.5		5 x C%			53		7.93

Size and Precision

Class	Type	Size	ABMA Grade
Martensitic Stainless Steel Balls	410, 416	1/8" - 1/2"	Grade 10,16, 24, 48, 100, 200
	420J1, 420J2	5/8" - 2"	Grade 16, 24, 48, 100, 200
		Duplicated Tolerance Allowed in DIN
	440B, 440C	Refer to Size and Precision for AISI 52100
Austenitic Stainless Steel Balls	302, 304	2.00 mm - 2"	Grade 100, 200, 500
	316, 316 L
	321, 430 F

440C 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. The 440C stainless steel balls are used instead of high carbon chrome alloy steel balls for 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.