Alloy Steel Balls
Chrome Steel Balls, Carbon Steel Balls, Grinding Media, Grinding Balls, Bearing Balls
ZG alloy steel balls show good performance in wear and crush resistance. They are suitable for large, medium or small-diameter ball mill, and have widely applied in magnetic materials, metallurgy, cement, and carbon mining industries. For example, it consumes about 3kg ZG alloy steel balls for producing 1000kg magnetic powder.
Manufacturing
- High-speed cold heading for steel wires
- Precision ball burnishing
- Steel ball hard grinding
- Precision ball initial lapping
- Vertical lapping for precision balls
- Horizontal precision lapping for metal balls
- Photoelectric visual inspection for metal balls
- Finished ball cleaning
Inspection Standards
| Shanghai Zhengang Steel Ball Manufacturing Co., Ltd | File number | ZG/QW 03-05.1-2009 |
| Inspection standards | Version | B |
| Titles: GCr15 3.000-25.400 Steel Ball Cold Heading (Hot Rolling) Process Inspection Standards | Modification status | 1 |
| Page number | 2/2 |
1. The standards regulate the inspection requirements and quality appraisal for GCr15G steel ball cold heading process.
2. The cold heading process will be detected according to “ZG/QW05-01-2009 Steel Ball Cold Heading Process Technical Requirements”.
3. Quality assurance is needed for hot rolling process apart from the cold heading technical requirements.
4. We test the measuring tools, testing methods, number of sampling (N), and unqualified counting number (C) by self-test or sample test according to Table 1.
| Inspection items | Measuring tools | Testing methods | Self-test N/C | Sample test N/C |
| Diameter tolerance | calipers with accuracy of 0.02mm | catch the ball (stay away from the chamfer) with the caliper jaw in an arbitrary direction | a test for each 15 minutes 3/0 | 10 balls for each barrel 10/0 |
| Pressure deviation | determining the difference between the max and mini length of the rings | |||
| Flaws | hot pickling | observe manually | a test for each 180 minutes | 30 balls for each barrel 30/0 |
5. Details of quality appraisal standards
5.1. Steel balls whose cold heading detection results meet the standards are left to be processed
5.2. Balls whose diameter tolerance and pressure deviation are in line with Table 2 are left to be processed
5.3. Steel balls with the burrs, cracks less than 1/2 of the sided allowance can be seen as qualified, those with the flaws less than 2/3 are treated as unqualified.
5.4. For those balls do not comply with 5.3, or whose diameter tolerance and pressure deviation are in line with Table 2, we retain them if the unqualified balls account for less than 2% of the total number, else we report as worthless.
5.5. Steel balls with the ball amount for each 1kg weight fail to reach our standards will be left for further process.
| Specification | Diameter tolerance | Pressure deviation |
| 3.000 | over 0.06-- 0.10 | over 0.05-0.08 |
| 3.969--5.953 | over 0.08-- 0.12 | over 0.06-0.10 |
| 6.000--8.000 | over 0.10-- 0.14 | over 0.08-0.12 |
| 8.500--12.000 | over 0.12-- 0.16 | over 0.10-0.14 |
| 12.303--15.081 | over 0.14-- 0.18 | over 0.12-0.16 |
| 15.875--19.05 | over 0.16-- 0.20 | over 0.14-0.18 |
| 19.875--25.400 | over 0.20- 024. | over 0.16-0.20 |
5.6. Unqualified treatment will be given the steel balls if there are unqualified items in the hot rolling quality assurance./p>
Quality Inspection
