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Manufacturing process of high-speed steel for taps and taps

A manufacturing process, high-speed steel technology, applied in the direction of manufacturing tools, improving process efficiency, improving energy efficiency, etc., can solve the problems of unguaranteed service life, carbide aggregation and growth, and low grain bonding strength to achieve tool life Improvement, uniform composition and excellent performance

Active Publication Date: 2019-05-31
江苏合一金属新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Manufacturing process of high-speed steel for taps and taps

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Embodiment Construction

[0019] In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments.

[0020] A special high-speed steel manufacturing process for taps, comprising the following steps,

[0021] Step S1, prepare raw materials according to the following weight percentages, C: 1.27%-1.35%, Mn: 0.5%-0.6%, Mo: 7.3%-8%, Cr: 3.5%-4%, W: 3%-3.5%, V: 2.8%-3.1%, the rest is Fe;

[0022] Step S2, put the mixed raw materials into a vacuum induction furnace, keep the vacuum degree in the vacuum induction furnace less than or equal to 2Pa, heat and melt the raw materials into a melt, and mix the melt in the vacuum induction furnace evenly, and then put The melt is cast into a steel ingot in a protective atmosphere, and the overall time is about 2.5 hours;

[0023] Step S3, the steel ingot formed in step S2 is treated by atmosphere-protected electroslag remelting, the temperature range of the mo...

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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, high-speed steel mainly has two smelting forms: 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 growth du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/24C22C38/22C22C33/04C22B9/18C21D8/06C21D1/18B23G5/06
CPCY02P10/25
Inventor 沈晨辉
Owner 江苏合一金属新材料科技有限公司
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