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24.606mm(31/32"), High Precision Stainless Steel Metal Ball For
Bearing
Introduction
International stainless steel marking method
The American Iron and Steel Institute uses three digits to indicate
various standard grades of forgeable stainless steel.
① Austenitic stainless steel is marked with 200 and 300 series
numbers.
② Ferritic and martensitic stainless steels are represented by
numbers in the 400 series. For example, some of the more common
austenitic stainless steels
It is marked with 302, 304, 316, and 310.
③ Ferritic stainless steel is marked with 430 and 446, and
martensitic stainless steel is marked with 410, 420 and 440C.
Remember, dual phase (austenite-ferrite).
④ Stainless steel, precipitation hardening stainless steel, and
high alloys with iron content less than 50% usually use patent
names or brand names.
AISI 304/302 Stainless Steel Balls
Profile
Precision AISI 304/302 stainless steel balls Type 18-8 are used when conditions require corrosion performance and toughness not available in hardenable stainless steels. Principal applications are in couplings, valves and pumps.
Characteristics
Low magnetic permeability: annealed, 1.003; cold worked, 1.10; severely cold worked, 10.0. High tensile strength at elevated temperatures. 18-8 stainless steel work-hardens rapidly. AISI 304/302 stainless steel balls of this material are passivated.
Corrosion Resistance
Type 18-8 stainless steel balls resist attack by oxidizing solutions, foodstuffs, sterilizing solution and most organic chemicals. They are susceptible to attack by halogen acids and moderately resistant to the sulphur acids.
Typical Hardness
Annealed – Rockwell B 75-95. Not annealed – Rockwell C 25-39.
Ball Sizes
Available in sizes from 1.5mm to 50.8mm in grades 50 through 1000.
Details
| Product name | forged solid stainless steel ball for bearing |
| Meterial | AISI 420C/ SUS 420C |
| Size | Ф0.3mm– Ф80mm |
| Other size | Customized |
| Surface treatment | Mirror polished |
| Grade | G10- G1000 |
| Hardness | HRC 54-60 |
| Material | Steel grade | Density(kg/dm3) | Hardness |
Stainless steel ball Not hardened | 304 / 304L ball | 7,95 | 25-39 HRC |
| 316 / 316L ball | 7,95 | 25-39 HRC | |
| 430 / 430F ball | 7,73 | 75-95 HRB | |
| 904 ball | 7,98 | 65-95 HRB | |
Stainless steel ball Hardened | 420C ball | 7,70 | 52-60 HRC |
| 440C ball | 7,75 | 58-64 HRC |
AISI 304/302 Stainless Steel Balls Specifications
304SS:
| Carbon | Nickel | Chromium | Manganese | Silicon | Phosphorus | Sulfur |
| 0.08% max. | 8% – 10.5% | 18% – 20% | 2.0% | 1.0% | 0.0045% | 0.30% max |
302SS:
| Carbon | Nickel | Chromium | Manganese | Silicon | Phosphorus |
| 0.15% max. | 8% – 10.5% | 17% – 19% | 2.0% | 1.0% | 0% |
