I. Core Characteristics and Advantages
High corrosion resistance: This is the primary advantage of stainless steel balls compared to bearing steel (chromium steel) balls. They can resist corrosion from water, steam, various acids, bases, salts, and other media, and are suitable for humid, corrosive chemical environments or those requiring cleanliness.
High precision and consistency: Dimension tolerances, true roundness, and surface roughness are all controlled within extremely small ranges (for example, the G10 grade accuracy tolerance can reach ±0.0013mm), ensuring smooth operation and low noise.
High strength and hardness: Through appropriate heat treatment (such as quenching and tempering of martensitic stainless steel), sufficient hardness and compressive strength can be achieved to withstand high loads.
Cleanliness and hygiene: No coating. The surface is dense and smooth, making it difficult for bacteria to adhere or multiply. It is easy to clean and disinfect.
Non-magnetic or weakly magnetic: Austenitic stainless steels (such as 304, 316) are usually non-magnetic or weakly magnetic in the annealed state, and are suitable for applications where magnetic interference needs to be avoided.
II. Common Material Types
The selection of materials for precision stainless steel balls depends on the specific application requirements, mainly balancing corrosion resistance and strength.
| material designation | Compliant with American standards | Characteristics and Applications |
| 440C |
AISI440 |
Martensitic stainless steel. Through heat treatment, it can achieve high hardness (HRC 58-62), good wear resistance, and also has certain corrosion resistance (better than carbon steel, but not as good as 304). It is the most commonly used material for stainless steel bearings and is suitable for high-load, wear-resistant, and having certain rust-prevention capabilities situations. |
| 420 | AISI420 |
Martensitic stainless steel. Its hardness is slightly lower than 440C, but its toughness and corrosion resistance are slightly better. It is also often used in bearings, valves, and medical devices. |
| 316/316L | AISI316 | Austenitic stainless steel. Added molybdenum to 304, with stronger resistance to chloride corrosion (resistance to pitting corrosion). Suitable for harsh corrosive environments such as marine environments, chemical industries, medical devices, etc. |
| 304/304L | AISI304 | Austenitic stainless steel. The most commonly used stainless steel. Excellent corrosion resistance, non-magnetic, but cannot be strengthened through heat treatment, and has lower hardness. Suitable for food, chemical, medical, etc., where high corrosion resistance and low load are required. |
FAQ
Q: Do you support non-standard or surface treatment?
A: Support! Diameter 0.5-150mm, can be polished, chrome plated, coated, etc.
Q: Application scenarios?
A: Bearings, automotive components, precision instruments, valves, hardware, grinding, etc.
Q: Is there an environmental certification?
A: The material complies with RoHS/REACH, and certification can be provided upon placing an order.
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