The present invention relates to an alloy steel for a mold tool and a mold using the same.

The steel for the mold tool comprises iron (Fe) as a main component, an amount of about 0.35 to 0.45 wt % of carbon (C), amount of about 0.80 to 1.20 wt % of silicon (Si), amount of about 0.20 to 0.50 wt % of manganese (Mn), amount of about 6.00 to 8.00 wt % of chromium (Cr), amount of about 1.50 to 3.00 wt % of molybdenum (Mo), and amount of about 0.80 to 1.20 wt % of vanadium (V) based on the total weight of the tool steel. Accordingly, the mold tool have improved physical properties at high temperature and extended life span.

A coated mold which can exhibit good sliding properties, and has further reduced droplets and excellent durability. The coated mold has a hard coating on a work surface, the hard coating including layer A in which layer a1 and layer a2 are alternately laminated, wherein the layer a1 is composed of a Cr-based nitride and has a thickness of 100 nm or less, and the layer a2 is composed of a nitride or carbonitride of (V.sub.1-aM.sub.a) (M is at least one selected from Mo and W), has an atomic ratio a of M to the sum of V and M of 0.05 or more and 0.45 or less, and has a thickness of 80 nm or less. Also: a method for manufacturing a coated mold; and a hard coat-forming target which can be used in the method for manufacturing a coated mold.

Various embodiments described herein provide a fastener system having straight walled driving surfaces that provides a reliable stick fit feature, while also improving stability of engagement between the system components. A feature of the new system is to allow stick fit engagement of existing standard straight walled drivers in the new system.

Various embodiments described herein provide a fastener system having straight walled driving surfaces that provides a reliable stick fit feature, while also improving stability of engagement between the system components. A feature of the new system is to allow stick fit engagement of existing standard straight walled drivers in the new system.

Various embodiments described herein provide a fastener system having straight walled driving surfaces that provides a reliable stick fit feature, while also improving stability of engagement between the system components. A feature of the new system is to allow stick fit engagement of existing standard straight walled drivers in the new system.

In a method for manufacturing a forging die with improved wear resistance, hot-work tool steel is obtained in which Al is added as a de-oxidizing agent during manufacture of the hot-work tool steel in a sufficient quantity such that it is only partially consumed during the de-oxidizing process, leaving Al in a range of greater than 0.015 weight percent after the de-oxidizing process. The forging die is shaped from the hot-work tool steel. By a subsequent nitriding process, a hardened surface is created on the forging die by heating in a nitriding atmosphere by interaction with the Al to improve a hardened surface on the hot-work forging die resulting in an improvement in wear resistance.

In a method for manufacturing a forging die with improved wear resistance, hot-work tool steel is obtained in which Al is added as a de-oxidizing agent during manufacture of the hot-work tool steel in a sufficient quantity such that it is only partially consumed during the de-oxidizing process, leaving Al in a range of greater than 0.015 weight percent after the de-oxidizing process. The forging die is shaped from the hot-work tool steel. By a subsequent nitriding process, a hardened surface is created on the forging die by heating in a nitriding atmosphere by interaction with the Al to improve a hardened surface on the hot-work forging die resulting in an improvement in wear resistance.

The present invention provides a casting/hot forging die having a forming surface and an opposing rear surface. The rear surface has a plurality of cavities spaced by a plurality of walls. Each of the plurality of walls has a substantially equal width. At least one transverse wall may also be provided such that the walls define a grid spacing a series of rectangular or triangular cavities.

The present invention provides a casting/hot forging die having a forming surface and an opposing rear surface. The rear surface has a plurality of cavities spaced by a plurality of walls. Each of the plurality of walls has a substantially equal width. At least one transverse wall may also be provided such that the walls define a grid spacing a series of rectangular or triangular cavities.

A method for manufacturing a hard coat-forming target includes using V powder and M powder to obtain a target composed of (V.sub.1-aM.sub.a). M is at least one selected from Mo and W. An atomic ratio a of M to the sum of V and M of 0.05 or more and 0.45 or less. A particle diameter of the M powder is smaller than a particle diameter of the V powder.