TEL

0563-4305087

Differences between high chromium ball, medium chromium ball, low chromium ball and forged steel ball

Release time:2021-02-04     Views

  High chromium ball, medium chromium ball, low chromium ball and forged steel ball are commonly used in grinding industry, and are also produced by Shandong elite. Many people may only know that they are different, but they cannot distinguish specific differences. The difference between these steel balls is introduced. Different quality indexes of high chromium ball: chromium content (> 10.0%) and carbon content (> 1.80% - 3.20%) are called high chromium ball. According to the national standard, the hardness of high chromium ball must be above 58 and the impact value AK (> 3.0j / 2). In order to achieve the hardness of high chromium ball, high temperature quenching and tempering must be used (at present, quenching is available in China). Oil quenching and air quenching, such as hardness test (HRC) less than 54, prove that the ball is not quenched. The quality index of medium chromium ball: chromium content 3.0% - 7.0%, carbon content 1.80% - 3.20% is called medium chromium ball, impact value AK (> 2.0j / 2), the hardness of national standard medium chromium ball must be greater than 47, in order to ensure the quality of chromium ball, high temperature, high hardness. Tempering treatment (elimination of casting stress) is adopted, such as steel ball table. The deep red surface indicates that the product has been tempered at high temperature. If the surface of the ball is still metal, it indicates that the product is not tempered at high temperature. The quality index of low chromium ball: 0.5% - 2.5% chromium content, 1.80% - 3.20% carbon content is called low chromium ball. The national standard requires that the hardness (HRC) of low chromium ball must be greater than 45 and the impact value (AK) should be greater than 1.5j/2. In order to ensure the quality of low chromium ball, high temperature tempering (to eliminate casting stress) should also be used, such as steel ball. The deep red surface indicates that the product has been tempered at high temperature. For example, the surface of the steel ball is still metallic, indicating that the product is not tempered at high temperature. Quality index of forged steel ball: chromium content is 0.1% ~ 0.5% (forged steel ball generally does not contain chromium), carbon content is less than 1.0%, and steel ball is forged at high temperature. Although the surface hardness of some forged steel balls can reach more than 56 (the hardened layer is only about 15 feet), the hardenability of the forged steel ball core is poor. Generally speaking, the hardness is only above 30 degrees. Under normal conditions, steel balls are often forged by water quenching.

2.jpg

  Wear resistance is different

  Wear resistance comparison: after quenching treatment, the wear resistance from high to low is: high chromium ball, medium chromium ball, low chromium ball, forged steel ball.

  The production process is different

  High chromium ball, medium chromium ball and low chromium ball belong to cast steel balls, which are made by melting raw materials at high temperature and casting with steel mold.

  Forging steel ball is forged by air hammer combined with die.


On:What kind of low chromium forging is cost effective

Next:Comparative analysis on economic benefits of high chromium and low chromium pellets in iron ore production