Equivalent grades include SUS420J2 / SUS420C, EN 1.4021 (420) / 1.4034 (420C) and X20Cr13 (420) / X46Cr13 (420C).
AISI 420 and 420C stainless steel balls are martensitic stainless steels that can be hardened to achieve high strength and wear resistance. 420C offers higher hardness due to increased carbon content, while 420 provides relatively better corrosion resistance and toughness.
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Also known as hardened stainless steel balls, 420 and 420C are used in applications requiring higher hardness and wear resistance than austenitic stainless steels.
AISI 420 and 420C stainless steel balls are manufactured from martensitic stainless steel and can be heat treated through hardening and tempering to achieve high strength and wear resistance.
420C, with significantly higher carbon content, achieves higher hardness and is preferred for demanding wear-resistant applications. 420 offers slightly better corrosion resistance and toughness, making it more suitable for applications where some corrosion resistance is still required.
| Item | Specification |
| Material | AISI 420 (EN 1.4021) / 420C (EN 1.4034) |
| Size Range | 0.5 mm – 200 mm |
| Hardness (Hardened & Tempered) | 420: 50–55 HRC / 420C: 58–62 HRC |
| Grade | G10 – G1000 |
| Density | 7.75 g/cm³ |
| Standard | ISO 3290 |
| Heat Treatment | Through-hardened and tempered |
| Corrosion Resistance | Moderate corrosion resistance (lower than 304 / 316) |
| Packing | Carton / Steel drum / Bulk bag / Custom |
| Condition | Hardened, cleaned and oiled |
| Delivery Time | Stock available or 30–35 days |
| Grade | C (%) | Si (%) | Mn (%) | Cr (%) | P (%) | S (%) |
| 420 | 0.15–0.40 | ≤1.00 | ≤1.00 | 12.00–14.00 | ≤0.040 | ≤0.030 |
| 420C | 0.42–0.50 | ≤1.00 | ≤1.00 | 12.00–14.00 | ≤0.040 | ≤0.030 |
Note: Typical chemical composition ranges. Minor variations may exist among different international standards.
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