This material is a high carbon (1.00%), chrome (1.36%) alloy steel that will harden into the 60 - 65 HRC range when oil quenched from a soaking temperature of 1475 ° F. Chrome alloy steel balls comprise about 90% of all balls manufactured. It is not corrosion resistant, it will rust easily. ![]() This material is very hard, at about 62 HRC (Hardness on the Rockwell "C" scale). This is a relatively inexpensive material. If it is a ball bearing application, the most likely material is chrome steel which is 52100 chrome alloy steel. High speed steel might be added to this list for severe and high temperature applications. Common materials are hard chrome steel 52100, C/S, 440C hard stainless steel and carbonized high carbon steel. ![]() "Bearing balls" is the general term for any hard steel ball that will function in a roller bearing application. The safest place to start is with the application itself. ![]() You need some balls just like the sample, but how do you find out what it is? Or you may need help in choosing the right ball material for a particular application. Ball Material Selection What Material is this Ball Made of? Ball Applications:
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