Patent
High performance screw head
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TLDR
In this article, a screw head is made of composite structure with a high Co or a high C high Cr alloy steel material, and a shaft section is made with composite structure of a hot-rolled steel tool of superior toughness strength or a maraging steel respectively by friction welding method.Abstract:
PURPOSE:To increase corrosion resistance, wear resistance, toughness and strength by making a screw head section of high Co, or high C high Cr alloy steel and a shaft with a hot-rolled tool steel of superior toughness strength or a maraging steel and bonding and combining the both sections. CONSTITUTION:A screw head section is made of composite structure with a high Co or a high C high Cr alloy steel material, and a shaft section is made of composite structure with a hot-rolled steel tool of superior toughness strength or a maraging steel respectively by, for instance, the friction welding method. It is further useful to carry out the coating 1c of a hard material such as VC, TiC, TiN or the like by ion plating, the molten salt method or the like. Wear gets slower than articles subjected to nitriding treatment heretofore available by using a material of same hardness for the head section in firm contact with etching all through from the surface of a matrix to a center, and the wear resistance life can be longer to a large extent. On the other hand, a shaft section is made of a selected material of selected toughness strength, and breakage can be prevented in the shaft section and its vicinity.read more
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Corrosion-resistant and wearproof screw head
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