Kiln Roller and Tire materials
Which type of material is used for the kiln tyre and for supporting rollers?
Rollers, (typically AISI 4140, 280-320 BHN) are usually harder than tires, (typically AISI 1045 forged or ASTM A148 castings with a hardness of 180 BHN to 220 BHN). As the frequency of roller contact is higher than tire surface contact by the ratio of their diameters, the effort is made to make the radial wear rate equal. Neither should wear at the expense of the other. It sometimes happens that an unusually hard tire or conversely an unusually soft roller can rapidly channel the roller surface as seen here. If such a situation develops it is relatively easy to do hardness testing
to confirm suspicions.
Posted by Walter Gebhart