Preparation method for semi-high speed steel

A semi-high-speed steel, forging and rolling technology, which is applied in the field of semi-high-speed steel preparation, can solve the problems of poor sharpening, low sharpness, and reduce the cost of the alloy amount of the blade steel, and achieves low cost, improved finish, and reduced material cost. The effect of process cost

Inactive Publication Date: 2016-05-18
CHONGQING CHUNGU MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the deficiencies of low sharpness and poor sharpening performance of the high-speed steel-inlaid paper-cutting blade in the prior art, and provide a semi-high-speed steel paper-cutting blade prepared by adopting the optimally designed blade steel material of the present invention. Its hardness reaches HRC64~66, and its sharpness and sharpening performance are significantly better than the steel-inlaid paper cutting blade made of high-speed steel as blade steel, and the alloy amount cost of blade steel is reduced

Method used

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Examples

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Effect test

Embodiment

[0021] The semi-high-speed steel copper-brazing steel-inlaid paper cutting blade prepared by the semi-high-speed steel of this embodiment, the paper-cutting blade is made by semi-high-speed steel 1 through copper brazing and welding on the cutter body 3, the composition of the semi-high-speed steel 1 As follows: It is composed of the following chemical elements in weight percentage: C: 0.66-0.7%, Si: 0.35-0.5%, Mn: 0.3-0.42%, Cr: 5.5-7%, W: 1.5-2.7%, Mo: 4.5~5%, V: 1~1.2%, Nb: 0.13~0.21%, Co0.5~0.55%, S≤0.01%, P≤0.02%, the rest is Fe;

[0022] Its concrete preparation method is as follows:

[0023] (1) Production of semi-high-speed steel:

[0024] First prepare semi-high-speed steel, adopt induction electric furnace or induction electric furnace+electroslag remelting to smelt semi-high-speed steel, meet the semi-high-speed steel of the present invention and be made up of as follows: the chemical element of weight percentage content: C: 68~0.7%, Si: 0.48~0.5%, Mn: 0.31~0.38%,...

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PUM

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Abstract

The invention discloses a preparation method for semi-high speed steel. The method includes the steps of (1) smelting, (2) forging and rolling, (3) annealing, (4) simultaneous copper brazing and quenching, and (5) tempering. In the step of smelting, smelting is conducted through an electric induction furnace, or electroslag remelting is conducted after smelting through the electric induction furnace; the semi-high speed shear steel is composed of, by weight percentage, 0.56%-0.65% of C, 0.40%-0.60% of Si, 0.25%-0.40% of Mn, 6.0%-6.8% of Cr, 1.6%-2.5% of W, 4.2%-5.2% of Mo, 0.7%-0.9% of V, 0.1%-0.2% of Nb, 0.3%-0.4% of Co or Ni, 0-0.02% of S, 0-0.025% of P, and the balance Fe. The hardness of a paper cutting blade made of the semi-high speed steel is identical with that of an original paper cutting blade which is manufactured through copper brazing and high-speed steel inlaying, but the sharpness is higher, blade sharpening is easy, and material cost and process cost are reduced.

Description

technical field [0001] The invention relates to the technical field of mechanical blades, more specifically, to a method for preparing semi-high-speed steel. Background technique [0002] The use performance of the paper cutting blade should not only have high sharpness and wear resistance, but also have good impact resistance and certain thermal hardness. [0003] It is very important to maintain the sharpness and sharpness of the cutting edge when cutting paper blades. The volume fraction of remaining carbides after quenching and tempering of high-speed steel is between 15% and 22%, and the size of remaining carbides is 2.5um to 15um. The carbides in the mouth are easy to fall off, which will not only reduce the sharpness, but also easily cause chipping during shearing. In recent years, we have researched, investigated, analyzed and demonstrated that if a suitable semi-high-speed steel is used, the number of carbides in the blade steel can be reduced to between 3% and 8%,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/30C22C38/48C21D8/00
Inventor 吴家超
Owner CHONGQING CHUNGU MACHINERY MFG CO LTD
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