A composite utility knife blade (10) and method of making such a blade involves butt joining a tool steel wire (44) to a front edge of an alloy steel backing strip (34) The wire (44) is electron beam welded to the backing strip (34) to form a composite strip (46) defining a first metal portion (20) formed by the alloy steel backing strip (34), a second metal portion (22) formed by the tool steel wire (44), and a weld region (28) joining the first and second metal portions (20, 22) The composite strip (46) is then annealed, and the annealed strip is straightened to eliminate any camber therein The annealed composite strip (46) is then hardened such that the first metal portion (20) defines a surface hardness within the range of approximately 38 Rc to approximately 52 Rc, and the second metal portion (20) defines a surface hardness within the range of approximately 60 Rc to approximately 75 Rc

Composite utility knife blade, and method of making such a blade

A composite utility knife blade (10) and method of making such a blade involves butt joining a tool steel wire (44) to a front edge of an alloy steel backing strip (34). The wire (44) is electron beam welded to the backing strip (34) to form a composite strip (46) defining a first metal portion (20) formed by the alloy steel backing strip (34), a second metal portion (22) formed by the tool steel wire (44), and a weld region (28) joining the first and second metal portions (20, 22). The composite strip (46) is then annealed, and the annealed strip is straightened to eliminate any camber therein. The annealed composite strip (46) is then hardened such that the first metal portion (20) defines a surface hardness within the range of approximately 38 Rc to approximately 52 Rc, and the second metal portion (20) defines a surface hardness within the range of approximately 60 Rc to approximately 75 Rc.

Composite utility knife blade

A static memory including a memory cell array having word lines, bit line pairs, and memory cells, each having a pair of nodes holding opposite levels; includes a dummy circuit disposed along the memory cell array, having a dummy word line, a dummy bit line pair, a self-timing dummy memory cell connected to the dummy word and bit lines and having a pair of nodes holding opposite levels, and load dummy memory cells connected to the dummy bit line pair; and a timing control circuit for detecting a voltage change of the dummy bit line pair to generate a start signal to a sense amplifier. The pair of nodes of the self-timing dummy memory cell are fixed to a first status, and the pair of nodes of the load dummy memory cell are fixed to a second status opposite to first status.

Static memory having self-timing circuit

Bimetal saw band comprising a support band of high microstructural stability and fatigue strength, comprising 0.25 to 0.35% of carbon, 0.3 to 0.5% of silicon, 0.8 to 1.5% of manganese, 1.0 to 2.0% of molybdenum, 1.5 to 3.5% of chromium, 0.5 to 1.5% of nickel, 0.5 to 2.5% of tungsten, 0.15 to 0.30% of vanadium, 0.05 to 0.10% of niobium, 0.05 to 1.0% of copper, up to 0.2% of aluminum, up to 1% of cobalt, remainder iron including melting-related impurities, and tooth tips made from a steel with high wear resistance, comprising 1.0 to 2.0% of carbon, 3 to 6% of chromium, 1 to 5% of vanadium, 3 to 10% of molybdenum, 4 to 10% of tungsten, 4 to 10% of cobalt, up to 1% of silicon, up to 1% of manganese, up to 0.5% of niobium, up to 0.5% of nitrogen, remainder iron including melting-related impurities.

Bimetal saw band

A composite metal article from two dissimilar metals is prepared. A metal base is comprised of a first metal and having first and second opposing surfaces and a least one longitudinally-positioned depression in each of the first and second opposing surfaces for receiving a wire. An elongated metal element comprised of a second metal is introduced into each of the at least one first and second depressions of the metal base to form a composite assembly, and the composite assembly is heated under pressure to urge the adjacent surfaces of the second metal elements and the depressions together to form a bonded article.

Composite metal article and method of making

A bimetallic saw blade or band saw includes a support strip (1) and a tool steel top layer (2) of high speed tool steel and sawteeth (6) in at least the top layer. The support strip is martensitically hardenable maraging steel having a maximum carbon concentration of 0.05 wt. % and a content of alloying elements of at least 10 wt. %.

Welded bimetallic sawblade or metal saw band

The bimetallic strip for manufacturing metal saw blades and metal saw strips consists of a carrier strip and a cutting steel surfacing welded thereto, preferably of high-speed steel, the carrier strip consisting of a martensite-hardened steel having a carbon content of at most 0.05% by weight and an alloy content of at least 10% by weight. A particularly high bending fatigue strength and fracture toughness of the bimetallic strip is obtained if the carrier strip has a carbon content of 0.01 to 0.02% by weight and contains, in % by weight, 8 to 18 of Ni, 6 to 12 of Co, 4 to 8 of Mo, 0.4 to 1 of Ti and/or Al and/or Nb/Ta of the alloy elements, the remainder being iron and impurities resulting from smelting.

Bimetallic strip for metal saw blades

A bimetallic strip or band for manufacturing metal saw blades and metal band saw bands includes a support strip and a tool steel top layer. The top layer is high speed tool steel. The support strip is martensitically hardenable maraging steel having a maximum carbon concentration of 0.05 wt. % and a content of alloying elements of at least 10 wt. %.

Gerhard Dr. Kraxner

Papers

Welded bimetallic sawblade or metal saw band

Bimetallic strip for metal saw blades

Bimetallic strip for metal saws