Appeal No. 96-0154
Application No. 08/047,434
The subject matter on appeal relates to a planar clad
sheet having improved abrasion resistance and being
substantially free of residual stresses. The clad sheet
comprises a layer of low-alloy steel having a rolled structure
and a layer of tool steel having a rolled structure and
comprising tempered martensite, coarse primary carbides and a
fine dispersion of secondary carbides. The sheet is produced
by joining the tool steel and low-alloy steel layers, hot
rolling the joined layers, cooling the hot rolled joined
layers to below 200°C and tempering the cooled joined layers
at a temperature between 250°C and 650°C. This appealed
subject matter is adequately illustrated by independent claim
12 which reads as follows:
12. A planar clad sheet having improved abrasion
resistance and being substantially free of residual stresses,
comprising a layer made of tool steel having a chemical
composition comprising, by weight, more than 0.5% carbon and
more than 3% chromium and a layer made of low alloy steel
having a chemical composition comprising, by weight, up to
0.25% carbon and a carbon equivalent up to 0.5% the layer made
of low-alloy steel having a rolled structure and the layer
made of tool steel having a rolled structure and comprising
tempered martensite, coarse primary carbides and a fine
dispersion of secondary carbides.
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Last modified: November 3, 2007