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420 Stainless Steel Balls Corrosion Resistance: Everything You Need to Know
This guide covers the corrosion resistance of 420 stainless steel ball, its performance in real-world conditions, how it compares to 304, 316, and 440C stainless steel balls, and expert tips for maximizing rust protection.
| Element | Content (%) |
| Content (%) | 12.0 – 14.0% |
| Carbon (C) | 0.15% min (typically 0.26–0.40%) |
| Manganese (Mn) | ≤1.00% |
| Silicon (Si) | ≤1.00% |
| Nickel (Ni) | ≤0.50% (optional) |
| Grade | Cr % | Mo | Corrosion Resistance | Hardness (HRC) |
| 420 | 12-14 | No | Moderate | 50-58 |
| 420C | 12-14 | No | Slightly better than 420 | 52-60 |
| 440C | 16-18 | Yes | Good – Very Good | 58-62 |
| 304 | 18-20 | No | Excellent | ≤40 (soft) |
| 316 | 16-18 | Yes | Outstanding (marine grade) | ≤40 (soft) |
Cosmetic pump dispenser balls (roll-on deodorant balls)
Food-grade check valves & spray nozzles
Automotive fuel injection balls
Precision bearings in non-aggressive environments
Medical & dental instruments
Lock mechanisms and fasteners
Aerosol valve balls Flow meter balls
Nitric Acid Passivation (ASTM A967 / AMS 2700) → Removes free iron, increases Cr/Fe ratio on surface
Citric Acid Passivation (eco-friendly alternative)
Electropolishing → Mirror-like finish + thicker passive layer
Oil or VCI packaging during storage and transport
