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. ZGBK prioritizes high-grade metallic alloys that offer exceptional fatigue life, corrosion resistance, and structural stability.
For noise-sensitive applications, check our Bearing Vibration Standards.
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. By using vacuum-degassed steel, ZGBK ensures that the molecular structure is uniform, significantly extending the L10 rating life.
Technical Selection for Extremes
ZGBK offers specialized heat stabilization (S0 to S4) to ensure dimensional accuracy up to 250°C.
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