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
CN105586541AInactive Publication Date: 2016-05-18CHONGQING CHUNGU MACHINERY MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING CHUNGU MACHINERY MFG CO LTD
Publication Date
2016-05-18
Estimated Expiration
Not applicable Ā· inactive patent
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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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