Flat Product Mill Rolls FLAT PRODUCT (FP) MILL ROLLS MILL TYPE ROLL TYPE ROLL GRADE HSM, Plate Roughing WR Special Alloy Cast Steel, Hi Cr Steel, Semi HSS HSM Roughing & Finishing BUR Duplex Cast Steel, Forged Steel HSM F1-F4, F5-F7 WR Hi Cr Iron, ICDP, HSS CSM Tandem, Reversible, Sendzimir WR Cr3, Cr4, Cr5 Forged SteelWeb