Champak Industries stock AR400 Wear Plate in sizes from 1/8″ thick up to and including 4″ thick. Call or Email Us For a Free Quote. This material is an Abrasion Resistant, Thru-Hardened, Alloy Wear Plate. Hardness range of this formable wear plate is 360-440 BHN. Stocking inventory includes 48″ x 96″ up to 96″ x 288″. Inquiry on all Hi-Def. Plasma and Oxy-Cutting jobs.