Special high-speed steel manufacturing technology for screw tap and screw tap

Abstract

The invention discloses a special high-speed steel manufacturing technology for a screw tap. The special high-speed steel manufacturing technology comprises the following steps that preparation is conducted on the raw materials of, by weight, 1.27-1.35% of C, 0.5-0.6% of Mn, 7.3-8% of Mo, 3.5-4% of Cr, 3-3.5% of W, 2.8-3.1% of V and the balance Fe; the vacuum degree in a vacuum induction furnace is maintained to be less than or equal to 2Pa, the raw materials are heated and molten to be a melt, and then the melt is cast into a steel ingot in protective atmosphere; the steel ingot is subjectedto a treatment method of atmosphere protection electroslag remelting, so that the effect of directional solidification is achieved, and a remelted ingot is obtained; the remelted ingot is subjected tosix-side forging at the temperature of 900-1100 DEG C, so that the integral deformation ratio of the remelted ingot is higher than 10, the final forging temperature is controlled to be 850-900 DEG C,and a semi-finished product is obtained; and the forged semi-finished product is subjected to quenching and tempering treatment, and special steel for the screw tap is obtained. The invention furtherdiscloses the screw tap. The screw tap is made of the high-speed steel manufactured by utilizing the technology. By utilizing the technology, the high-speed steel with the carbide particle sizes being even and the grain sizes being small can be manufactured, and the life of the screw tap manufactured by utilizing the high-speed steel is obviously prolonged.

Description

technical field [0001] The invention relates to a special high-speed steel manufacturing process for a screw tap and the screw tap, belonging to the technical field of high-speed steel. Background technique [0002] Taps are generally manufactured using high-speed steel metal materials. At present, there are two main smelting forms of high-speed steel: pyrometallurgy and powder smelting. [0003] Pyrometallurgical smelting is the most traditional metallurgical method. The steel smelted by this method has a certain degree of macroscopic and microscopic segregation, the unevenness of eutectic carbides is relatively high, and the particle size of carbides is relatively large. [0004] Powder smelting is the most popular metallurgical method at present. The steel smelted by this method has greatly improved carbide particles and unevenness, but the low sintering temperature leads to low bonding strength between grains. And there is the disadvantage of carbide aggregation and gr...

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Problems solved by technology

[0004] Powder smelting is the most popular metallurgical method at present. The steel smelted by this method has greatly improved carbide particles and unevenness, but the low sintering temperature leads to low bonding strength between grains. And in the process of heat treatment, there are disadvantages of carbide aggregation and growth, and the service life cannot be guaranteed

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