19mm 7/8" 22.225mm Stainless Steel Balls for Bicycle Auto Parts

Basic Information

Material	201 304 316 420C 440C
Metric Size	0.4mm - 100mm
Inch Size	1/64" - 4"
Precision Grade	G100 G200 G500 G1000 G2000

Mechanical Properties

	201	304	316	420C	440C
Density g/cm3	7.85	7.95	7.95	7.70	7.75
Hardness HRC	25 - 39	10 - 39	10 - 39	52 - 60	57 - 65
Tensile Strength PSI×103	100 - 180	72 - 188	80 - 180	250 - 275	275 - 290
Young's Modulus GPa	200	200	200	205	210

Chemical Composition

	201	304	316	420C	440C
%C	0.150 Max	0.080 Max	0.080 Max	0.43 - 0.50	0.95 - 1.20
%Si	1.00 Max	0.75 Max	1.00 Max	1.00 Max	1.00 Max
%Mn	5.50 - 7.50	2.00 Max	2.00 Max	1.00 Max	1.00 Max
%P	0.060 Max	0.045 Max	0.045 Max	0.040 Max	0.040 Max
%S	0.030 Max	0.030 Max	0.030 Max	0.030 Max	0.030 Max
%Cr	16.00 - 18.00	18.00 - 20.00	16.00 - 18.00	12.50 - 14.50	16.00 - 18.00
%Ni	3.50 - 5.50	8.00 - 10.50	10.00 - 14.00	-	-
%N	0.250 Max	0.100 Max	-	-	-
%Mo	-	-	2.00 - 3.00	-	0.75 Max

International Standards

	201	304	316	420C	440C
USA	AISI201	AISI304	AISI316	AISI420C	AISI440C
JAP	SUS201	SUS304	SUS316	-	SUS440C
UK	201S01	304S15	316S16	-	-
CHN	1Cr17Mn6Ni5N	0Cr18Ni9	0Cr17Ni12Mo2	4Cr13	9Cr18Mo
RUS	14Ch18N4G4L	08KH18N10	08KH16N11M3	40Kh13	95X18
ITA	-	X5CrNi18-10	X5CrNiMo1712	X46Cr13	X105CrMo17
FRA	Z12CMN17-07Az	Z7CN18-09	Z6CND17.11	Z34C14	Z100CD17
GER	1.4372	1.4301	1.4401	1.4034	1.4125

Feature
201:Cr-Mn stainless steel balls, with properties similar to AISI 302/304 balls (slightly higher mechanical characteristics). Balls are provided in the passivated condition.

304:Unhardened austenitc stainless steel balls, they display good mechanical characteristics, toughness and corrosion resistance. AISI 304L provides lower carbon content, AISI 302 better mechanical characteristics. Balls are provided in the passivated condition.

316:Austenitic stainless steel balls with higher corrosion resistance than AISI 304 balls. They show good toughness. AISI 316L has a lower carbon content (maximum 0,030%). Balls are provided in the passivated condition.

420C:Martensitic hardened stainless steel balls, they feature good hardness, corrosion resistance, wear and abrasion resistance. Balls are provided in the passivated condition.

440C:Martensitic hardened stainless steel balls, they feature remarkable hardness, wear resistance, surface finishing, narrow dimensional tolerances. For that reason this type of steel is frequently used in pcision devices. Balls are provided in the passivated condition.

Corrosion Resistance
201:Similar to the corrosion resistance of AISI 302/304 materials.
304:Very good corrosion resistance with respect to organic substances, oxidating solutions, foodstuff, sterilizing solutions. Good resistance with respect to atmospheric corrosion and dyes. They are subjected to pitting and crevice corrosion in psence of hot chloride solutions and to stress corrosion when temperature exceeds 60°C. They do not resist to sulfuric acid solutions. AISI 302 shows slightly best corrosion resistance with respect to AISI 304/304L stainless steels.

316:Very good corrosion resistance with respect to organic substances, good resistance to several strong acids (acetic, phosphoric, sulphuric acid) and on sea water. They are subjected to pitting and crevice corrosion in psence of hot chloride solutions and to stress corrosion when temperature exceeds 60°C. They do not resist in contact with hydrochloric and hydrofluoric acids, aqua regia, iron and magnesium chlorides.

420C:Good corrosion resistance in industrial atmosphere, freshwater, steam, alcool, ammonium, several oilfield products and organic compounds, dairy products, mild acid environments. Fairish in foodstuff and alkaline solutions. Fair in salt atmosphere. It does not resist in contact with sea water and strong acids (even if diluted).

440C:The material resists to corrosion in contact with freshwater, steam, oil, petrol, alcohol. They are subjected to pitting corrosion in sea water environments. Poor corrosion resistance in acid environments.

Application
201:Special bearings, automotive components, switches, die casting devices. They are widely used in the electronic industry.

304:Special bearings and pumps, aerosol pumps, gardening and household sprayers, perfume miniature pumps, seams, medical application valves, agricultural backpack sprayers. They are used in foodstuff, aerospace and military industry.

316:Special bearings, pumps and valves, aerosol and dispenser sprayers. Utilised in the foodstuff, paper, chemical, rubber, military, textile industry. Applications in photographic devices, medical instruments, quick couplings, recirculating balls, ink cartridges, jewels.

420C:Special bearings, anti-friction bearings, special pumps, recirculating balls, lighters, pens, automotive seatbelts & components.

440C:Precision bearings, anti-friction bearings, special valves, conveyor belts and rollers, ballpoint pens. They are used in foodstuff, medical instruments, quick couplings, recirculating ball bearings, knotting devices, oil refinery devices.

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