Ball flat steel refers to a type of steel that is mainly used for making bearings, such as angular contact ball bearings, cylindrical roller bearings, and tapered roller bearings. It is characterized by its high hardness, good wear resistance, and high elastic limit.
According to the standard, ball flat steel should be made from high-quality carbon structural steel or alloy structural steel, and its chemical composition, mechanical properties, and non-metallic inclusions should meet certain requirements. The standard also specifies the dimensions, tolerances, surface quality, and other technical parameters of ball flat steel.
In addition, the standard requires that ball flat steel should be inspected and tested before delivery, including chemical composition analysis, mechanical property testing, surface quality inspection, and ultrasonic flaw detection. The results of these tests should meet the specified requirements, and the products should be marked, packaged, transported, and stored according to the standard.
| Standard ID |
GB/T 9945-2012 (GB/T9945-2012) |
| Description (Translated English) |
Hot-rolled bulb flats |
| Sector / Industry |
National Standard (Recommended) |
| Classification of Chinese Standard |
H44 |
| Classification of International Standard |
77.140.70 |
| Word Count Estimation |
12,161 |
| Older Standard (superseded by this standard) |
GB/T 9945-2001 |
| Quoted Standard |
GB/T 222, GB/T 223.5, GB/T 223.9, GB/T 223.12, GB/T 223.14, GB/T 223.16, GB/T 223.19, GB/T 223.23, GB/T 223.26, GB/T 223.40, GB/T 223.54, GB/T 223.62, GB/T 223.63, GB/T 223.69, GB/T 223.72, GB/T 228.1, GB/T 229, GB/T 2101, GB/T 2975, GB/T 4336, GB/T 20066 |
