This is an oil hardened steel, which is universally used by the ball and roller bearing industry. This steel has very good hardness, very good physical characteristics and excellent wear resistance.
Chrome Steel Balls: AISI 52100/ 100Cr6/ 100C6/ SUJ2/ Wks 1.3505
Bearing steel balls are widely used, the main applications are: as rolling elements of Bearings, bicycles, car seat slides, CV joints, grinding media, universal wheels.
Chrome Steel Ball,Chrome Steel Ball Bearings,Chrome Ball Bearings,Chrome Steel Bearing CHANGZHOU HUARI STEEL BALL CO., LTD. , https://www.stwballs.com
1. When unpacking, check whether the main circuit terminal is loose and whether the voltage regulator brush is in good contact.
2. When not in use for a long time, use a 500V megohmmeter to check the insulation resistance of the main loop to the ground before use. The resistance should not be less than 0.5 megohms.
3, the input voltage in line with the nameplate voltage value (-220V, -380V), the value of the difference should be ± 10%, the frequency is 50Hz.
4, the current range switch is not allowed with load operation.
5. When operating, rotate the handwheel uniformly and slowly so as not to damage the regulator.
6. The working time shall not exceed 5 minutes at full load and the working time shall be less than 2.5 minutes, but the working cycle shall be greater than 10 minutes.
7, riser shell ground terminal, use should be well grounded. 
Operational Maintenance Precautions for Ramp (High Current Generator)
The operation and maintenance precautions of the current riser (high current generator) are as follows when using and maintaining: