HARDNESS

The primary ordering requirement for Hardwear� steels is minimum surface hardness. The hardness distributions of almost twelve thousand Hardwear 400F plates and approximately three thousand Hardwear 500F plates are shown in Figures 3 and 4. The hardness range of Hardwear 400F is 360 to 444 HB. For Hardwear 500F, the range of hardness is 460 to 544 HB. Inquire with Bethlehem if more restrictive hardness levels are required.

PIN ABRASION

The Pin Abrasion test is used to compare abrasion resistant steels. A standard test pin, machined from the steel to be tested, is abraded by a 150-mesh garnet abrasive cloth under specified laboratory conditions and the pin's weight loss, in milligrams, is measured. The results of testing conducted by Bethlehem, comparing the pin weight loss and corresponding hardness of the Hardwear grades are shown in Figure 5.

Bethlehem Lukens Plate Products

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