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Chemical Composition  


300 Series Stainless Steel Balls

302 & 304 stainless steel balls are an austenitic, unhardened stainless steel with excellent resistance to corrosion by oxidizing agents, most organic chemicals, food stuffs and sterilizing solutions. 304 stainless steel has a lower carbon content than 302 stainless steel. 304 is slightly magnetic.

316 stainless steel balls provide resistance to sulfurous acid compounds and other highly corrosive environments. 316 stainless steel is used in the presence of sulphuric, phosphoric, and acetic acids. 316 is the least magnetic of the 300 series.

316 L stainless steel balls have the same properties as 316, except that it has a lower carbon content. It is easier to machine.

400 Series Stainless Steel Balls

420 stainless steel balls with good corrosion resistance, higher hardness & magnetic in nature, have brighter surface finish and finds application in special bearings and valves where corrosion resistance is required along with the wear resistance.

420 C stainless steel balls due to high hardness together with the good resistance against corrosion makes them suitable for valves, special bearings and so on, in which the protection with rustproof-greases is poor or absent.

440 C stainless steel balls have greatest hardness with the highest resistance to corrosion. These are best for application on valves, bearings and ball pens.

Specifications Composition %
C Si Mn P S Cr Mo Ni
AISI 302 0.12 max 0.20 - 2.00 0.50 - 2.00 0.045 max 0.03 max 17.0 - 19.0 --- 8.0 - 11.0
AISI 304 0.08 max 1.00 max 2.00 max 0.045 max 0.03 max 18.0 - 20.0 --- 8.0 - 10.5
AISI 316 0.08 max 1.00 max 2.00 max 0.045 max 0.03 max 16.0 - 18.0 2.0 - 3.0 10.0 - 14.0
AISI 316 L 0.03 max 0.20 - 1.00 0.50 - 2.00 0.045 max 0.03 max 16.5 - 18.5 2.25 - 3.0 10.0 - 14.0
AISI 420 0.15 min 1.00 max 1.00 max 0.04 max 0.03 max 12.0 - 14.0 --- ---
AISI 420 C 0.42 - 0.50 1.00 max 1.00 max 0.04 max 0.03 max 12.5 - 14.5 --- 1.00 max
AISI 440 C 0.95 - 1.20 1.00 max 1.00 max 0.04 max 0.03 max 16.0 - 18.0 0.40 - 0.80 ---
 
 

Bearing Balls

52100 chrome alloy steel balls offer high hardness and excellent resistance to wear and deformation. They are made from the finest bearing quality steel. 52100 material is specified by precision bearing manufacturers where precise spherical and tolerance accuracy are required.


Specifications Composition %
C Si Mn P S Cr Mo Ni
AISI 52100 0.95 - 1.10 0.35 max 0.20 - 0.50 0.025 max 0.025 max 1.30 - 1.60 --- ---
 

Bicycle Balls

Balls of this material have the advantage of being through hardened and will take higher loads and provide longer life than case hardened balls, for such applications as the cycle industry. These balls are substantially cheaper than balls manufactured from high carbon chrome alloy steels.


Specifications Composition %
C Si Mn P S Cr Mo Ni
EN 9 0.75 - 0.95 0.35 max 1.00 max 0.04 max 0.05 max --- --- ---
EN 31 0.90 - 1.10 0.10 - 0.35 1.10 max 0.05 max 0.05 max 1.00 - 1.50 --- ---
 

Non-Ferrous Brass Balls

Balls made of this material offer excellent resistance to corrosion in general. The most common uses include various types of industrial pumps and valves. Brass is resistant to corrosion caused by fuel oils, gasoline (petrol), butane, benzene and other similar types of corrosive chemical agents. It is also resistant in environments where air and salt water are present.


Specifications Composition % Grade Hardness
Cu Zn
BS 2870 / CZ 123 60 % 40 % 200, 500, 1000 180 - 200 HB
 
 


Stainless Steel Balls  |  Non-Ferrous Brass Balls  |  Bearing Balls  |  Bicycle Balls  |  Grinding Media  |  Burnishing Media
Why MBI?  |  Manufacturing Process  |  Glossary  |  Ball Applications  |  Grades/Tolerances  |  Chemical Composition
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