Optimizing Reliability: Materials & Standards
> RIGOROUS METALLURGICAL DETAIL FOR PREMIUM INDUSTRIAL COMPONENTS.
Bearing Materials are the most critical factor determining the operational life and load-bearing capacity of any mechanical system. At ZGBK, we prioritize high-grade metallic alloys that offer exceptional fatigue life, corrosion resistance, and structural stability.
Understanding the chemical composition allows engineers to optimize performance. For noise-sensitive applications, check our Bearing Vibration Standards to see how industrial element purity affects vibration levels.
Chrome Steel (GCr15) Data
TABLE 1. CHEMICAL COMPOSITION OF BEARING STEEL (GCR15)
| NO. | C | MN | SI | CR | S < | P < | NI | CU | HB |
|---|---|---|---|---|---|---|---|---|---|
| GCr15 | 0.95-1.05 | 0.20-0.40 | 0.15-0.35 | 1.30-1.65 | 0.020 | 0.027 | 0.30 | 0.25 | 170-207 |
TABLE 2. INTERNATIONAL STEEL GRADE COMPARISON
| COUNTRY | CHINA | ISO | U.S.A | GERMANY | JAPAN | SWEDEN |
|---|---|---|---|---|---|---|
| Grade | GCr15 | 683/XVIII | AISI 52100 | 100Cr6 | SUJ2 | SKF3 |
TABLE 3. PHYSICAL PROPERTIES OF CHROME STEEL
| PROPERTIES | DENSITY (KG/M³) | EXPANSION (10⁻⁶/K) | HARDNESS (HRC) | MODULUS (GPA) |
|---|---|---|---|---|
| Values | 7.81 x 10³ | 12.5 | 60 – 64 | 208 |
Stainless Steel Composition
TABLE 4. CHEMICAL COMPOSITION OF STAINLESS STEEL
| NO. | C% | CR% | SI% | MN% | S% | P% | MO% | NI% |
|---|---|---|---|---|---|---|---|---|
| AISI 440C | 0.95-1.10 | 17.0-19.0 | ≤0.8 | ≤0.7 | ≤0.03 | ≤0.035 | - | - |
| AISI 304 | ≤0.08 | 18.0-20.0 | ≤1.0 | ≤2.0 | ≤0.03 | ≤0.035 | - | 8.0-10.5 |
| AISI 316 | ≤0.08 | 16.0-18.0 | ≤1.0 | ≤2.0 | ≤0.03 | ≤0.045 | 2.0-3.0 | 10.0-14.0 |
Tolerance & Precision Comparison
TABLE 5. TOLERANCE & PRECISION GRADE COMPARISON
| STANDARD | NORMAL | CLASS 6 | CLASS 5 | CLASS 4 | CLASS 2 |
|---|---|---|---|---|---|
| ISO 492 / JIS | Normal/0 | Class 6 | Class 5 | Class 4 | Class 2 |
| DIN 620 | P0 | P6 | P5 | P4 | P2 |
| ANSI ABMA 20 | ABEC 1 | ABEC 3 | ABEC 5 | ABEC 7 | ABEC 9 |
Material Fatigue Life & Integrity
The fatigue life of Bearing Materials is determined by the cleanliness of the steel. Non-metallic inclusions can act as stress concentration points. By using vacuum-degassed steel, ZGBK ensures that the molecular structure is uniform, significantly extending the L10 rating life.
Technical Selection for Extremes
When selecting materials for extreme temperatures, engineers must consider thermal expansion coefficients. At ZGBK, we offer specialized heat stabilization (S0 to S4) to ensure dimensional accuracy up to 250°C.
Request Full Technical Data
Our technical team can provide full ISO 492 tolerance tables and specialized steel reports for your project.
Engineered for extreme reliability.
- ✓ High-purity Vacuum Degassed Steel
- ✓ ISO 9001:2015 Certified Production
- ✓ 100% Noise & Vibration Testing
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