20CrNiMo steel balls are case-hardened alloy steel balls designed for high-load, high-impact, and wear-resistant applications. By carburizing and quenching, the ball surface achieves very high hardness while the core remains tough, making 20CrNiMo an excellent choice for components that face repeated shock loads, contact fatigue, and sliding wear.

Compared with standard bearing steel balls (e.g., GCr15 / AISI 52100), 20CrNiMo is often selected when you need better core toughness and impact resistance after heat treatment, especially in automotive and heavy-duty mechanical systems.

Key Features

· Case-hardened structure: hard wear-resistant surface + tough core for impact resistance

· Excellent contact fatigue performance for repeated rolling/sliding contact

· Stable dimensional consistency after controlled heat treatment

· Suitable for mass production with consistent metallurgical quality

Why Choose Eurasian

Certified quality for demanding industries

Our manufacturing and quality systems for 20CrNiMo steel balls manufacturing are certified to IATF 16949:2016 and other international standards, widely recognized by global automotive and precision industries. This enables strict automotive-level process control across aluminum balls and other industrial balls, ensuring stable performance batch after batch.

Strong heat treatment and materials know-how

As an experienced 20CrNiMo steel balls factory, Eurasian has long expertise in producing high-precision chrome steel, stainless steel, and carbon steel balls, supported by CQI-9-based heat treatment and advanced inspection equipment. The same metallurgical and process knowledge is applied when developing and manufacturing aluminum balls, delivering consistent hardness, microstructure, and dimensional accuracy across materials.

Full range of precision balls from one source

Under integrated 20CrNiMo steel balls manufacturing, Eurasian supplies bearing steel balls (GCr15 / AISI 52100), stainless steel, aluminum, carbon steel, and special balls. One consolidated supply base supports multiple projects and platforms, simplifying supplier management, aligning quality standards, and reducing total procurement and logistics costs.

Experience with global OEM and export customers

Answering why choose Eurasian, we supply precision balls for automotive seat systems, wheel bearings, industrial equipment, and other export applications through long-term cooperation with overseas customers. Our team understands international documentation, packaging, and inspection requirements, making aluminum ball sourcing smoother and more predictable.

Stable capacity and flexible cooperation

Backed by established production lines at our 20CrNiMo steel balls factory, with daily capacity measured in tons, we support both trial orders and large-volume programs with reliable delivery. Flexible MOQs, customized packaging, and responsive communication help introduce aluminum balls into new projects while controlling risk and lead time.

1. What is 20CrNiMo steel?

20CrNiMo is a low-carbon alloy steel designed for carburizing (case hardening). It typically contains chromium and nickel (plus molybdenum) to improve hardenability and core toughness after heat treatment.

2. What does “carburized / case hardened” mean for steel balls?

Case hardening adds carbon to the surface layer during heat treatment, then the ball is quenched and tempered. The surface becomes very hard for wear resistance, while the core remains tougher to absorb impact.

3. How does 20CrNiMo compare with GCr15 (AISI 52100 / 100Cr6) balls?

Difference: GCr15 is usually through-hardened and widely used for bearings with high hardness and good fatigue life. 20CrNiMo is often chosen when impact resistance and core toughness are more critical, especially for shock-loaded conditions.

4. What hardness can you achieve on 20CrNiMo steel balls?

Hardness depends on the carburizing recipe, case depth, and tempering. Many customers specify surface hardness around 58–62 HRC, with a lower core hardness to keep toughness.

5. Can you supply precision grades like G10 or G20?

Yes, precision grades such as G10 / G20 / G40 can be supplied depending on diameter and order requirements. Tell us the ball size, grade, and application, and we’ll confirm feasibility and lead time.

6. What sizes do you offer?

Custom diameters are available in both metric and inch sizes. If you provide the diameter tolerance and grade requirement, we can recommend a suitable production route.

7. Are 20CrNiMo balls corrosion resistant?

No. 20CrNiMo is alloy steel, not stainless steel. If you need corrosion resistance, consider stainless steel balls such as 420C/440C (hardenable) or 304/316L (non-hardenable).

8. What industries commonly use 20CrNiMo steel balls?

Common industries include automotive systems, heavy-duty mechanical assemblies, and industrial equipment where rolling contact faces shock loads and wear.

9. What test reports can you provide?

Reports can include hardness, size inspection, roundness, surface condition, and (if requested) metallography/case depth verification, plus traceability documents according to your order requirement.

10. What information should I send for a quotation?

Please send:

· Ball diameter (mm or inch) and quantity

· Precision grade (e.g., G20) and tolerance requirements

· Heat treatment requirement (surface hardness, case depth if specified)

· Application and any special testing/packaging needs