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Martensite stainless steel for manufacture of scalpel blade and manufacturing method of martensite stainless steel

A martensitic stainless steel, manufacturing method technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of insufficient sharpness of the blade edge, insufficient hardness, surface rust, etc., to avoid adverse effects and have a good anti-corrosion effect Effect

Inactive Publication Date: 2018-07-20
江苏延汉材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the manufacturing process of the blade, it is found that the hardness of 20Cr13 and 30Cr13 after quenching and tempering is about HV560-HV600, which is not enough for the manufacture of the blade. Due to the insufficient hardness, the sharpness of the blade edge will be insufficient during the grinding process, which will affect the final cutting effect
The hardness of 40Cr13 after heat treatment is about HV650, but the hardness is still low; at the same time, the anti-rust performance of 40Cr13 is insufficient, especially in coastal areas with high humidity, the surface of the blade is seriously rusted during storage after processing
In this technical solution, the carbon content is still too high, and the size of primary carbides in the microstructure is controlled through the process, which has high requirements on the process, and there are still problems caused by too high carbon content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the martensitic stainless steel has the following composition by weight percentage: C: 0.65-0.70%, Si≤0.5%, Mn0.4-0.7%, P≤0.03%, S≤0.025%, Ni≤0.5%, Cr: 13.0-13.5%, Mo: 0.8-1.2%, V: 0.08-0.12%, and the balance is Fe and other unavoidable impurities.

[0037] Its manufacturing methods include:

[0038](1) For the above composition, the required composition structure is obtained through electric furnace steelmaking and VOD refining. The content of gas elements in the steel is controlled as follows: N≤350ppm, H≤2.0ppm, O≤35ppm, and the corresponding size of;

[0039] (2) Perform electroslag remelting to remove non-metallic impurities, and perform forging in three dimensions to uniform and refine the grains, and obtain a billet of suitable size after forging;

[0040] (3) Grinding the billet surface to remove surface defects;

[0041] (4) Heating the billet to 860°C for hot rolling to a thickness of 3.0 mm;

[0042] (5) Carry out spheroidizing anneali...

Embodiment 2

[0045] In this embodiment, the martensitic stainless steel has the following composition by weight percentage: C: 0.43%, Si: 0.22%, Mn: 0.4%, P≤0.01%, S≤0.001%, Ni: 0.2%, Cr: 13.4% , Mo: 0.5%, V: 0.1%, and the balance is Fe and other unavoidable impurities.

[0046] In the preparation method, the annealing temperature in the step (3) is 830° C.; in the step (5), the billet is heated to 880° C. for hot rolling to a thickness of 2.0 mm.

[0047] All the other are with embodiment 1.

Embodiment 3

[0049] In this embodiment, the martensitic stainless steel has the following composition by weight percentage: C: 0.45%, Si: 0.3%, Mn: 01.%, P≤0.01%, S≤0.001%, Ni: 0.25%, Cr: 13.5 %, Mo: 0.9%, V: 0.12%, and the balance is Fe and other unavoidable impurities.

[0050] In the step (5) of the preparation method, the billet is heated to 870° C. for hot rolling to a thickness of 2.5 mm.

[0051] All the other are with embodiment 1.

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Abstract

The invention relates to martensite stainless steel for manufacture of a scalpel blade and a manufacturing method of the martensite stainless steel. The martensite stainless steel is prepared from, byweight, 0.65-0.70% of C, smaller than or equal to 0.5% of Si, 0.4-0.7% of Mn, smaller than or equal to 0.03% of P, smaller than or equal to 0.025% of S, smaller than or equal to 0.5% of Ni, 13.0-13.5% of Cr, 0.8-1.2% of Mo, 0.08-0.12% of V and the balance Fe and other inevitable impurities. The hardness reaches HV700 or above after quenching and tempering are completed, meanwhile, the carbon content of the martensite stainless steel is controlled within a reasonable range in order to avoid adverse influences caused by increase of the carbon content in the prior art, and the anti-corrosion effect is good.

Description

technical field [0001] The invention relates to the technical field of metal materials and processing, in particular to a method for manufacturing martensitic stainless steel for scalpel blades. Background technique [0002] Martensitic stainless steel belongs to chromium series stainless steel, its room temperature structure is ferrite plus carbide, after quenching and tempering, it is martensite plus retained austenite and carbide at room temperature. The main development purpose of martensitic stainless steel is to be used in the manufacture of kitchen knives, garden tools, aquatic knives, etc. Martensitic stainless steel mainly increases the quenching hardness, wear resistance, and strength by increasing the carbon content and producing uniform larger-grained carbides through heat treatment. The existing technology does not effectively control the surface quality and harmful components of the steel strip in the process of manufacturing martensitic stainless steel. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C33/04C21D8/02C21D9/00C21D1/32
CPCC21D1/32C21D8/0226C21D9/0081C22C33/04C22C38/001C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 赵鹏
Owner 江苏延汉材料科技有限公司
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