That is, at one end of the steel, a saw (annealed material) and a grinding wheel cutter (not annealed material) are used to cut a wafer sample with a thickness of 12 to 15 mm, and the tested side of the sample is ground with a grinder. 9. The reason for the formation of white spots is the existence of hydrogen in the steel, and the second is that the steel is not slowly cooled at 600~300℃ after forging, and the hydrogen is not fully diffused, resulting in structural stress and cracking.

Chemical analysis methods are relatively slow and are not suitable for production sites. Steel wire discs are usually inspected with naked eyes. The tempering process of high inkstone chromium bearing steel is as follows: quenching temperature 820~840℃; tempering temperature: 150℃, tempering time 1~2h;

The inspected surface of the sample should be ground and polished; the inspected surface for checking the annealing structure and the temperature of the decarburized layer should be etched with 2% nitric acid alcohol solution and inspected; the inspected surface of non-metallic inclusions should be polished, No erosion inspection; carbide strips, carbide liquefaction, and carbide mesh surfaces should be etched with 4% nitric acid alcohol solution before inspection.

This method can greatly reduce the long life bearing time of shutdown, which is beneficial to improve the efficiency of repair work, reduce costs and ensure the quality of repair. During the overhaul process, attention should be paid to eliminate potential safety hazards, such as adjusting the brake gap, replacing worn-out clutch friction plates, and enabling the seat of the cab to be easily adjusted up and down, as well as eliminating some problems that may cause injury to the driver and maintenance personnel and machine failure Safety hazards. In order to ensure the quality, the parts that need to be replaced should be purchased from the original manufacturer or the designated cooperating manufacturer as required. 

 

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