Quartz in the rocks is a threat to bucket abrasive wear, its hardness is Hv1000-1100, thus we must satisfy 2 conditions in order to improve the service life of the bucket, one is that liner material surface need to have high hardness and wear resistance ability, the second is lining plate should have good weld-ability.

Since the middle of last century, many foreign well-known wear-resistant materials company began to use hardfacing method to improve the service life of the bucket, main hardfacing materials is high chromium alloy.

After 80 years of the last century, some developed countries such as Germany VAUTID, EIPA company, America SAS company also began to use high chromium hardfacing chromium carbide overlay plate as it has very high hardness and high wear resistance, also good toughness of base plate, can fully meet the 2 conditions of bucket liners.

Alloy steel pate worn out after 3-4 months while chromium carbide lined bucket can work more than 1 time better than the original alloy steel plate. Large mining excavator annual repair costs is millions, so it is very important to use wear resistant steel plate to reduce the repair costs and work-load, to ensure the stability output of open pit coal mining and their economic benefit.