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High-surface-hardness tool steel with excellent 800MPa electroplating performance and production method

A production method, 800mpa technology, applied in the direction of manufacturing tools, process efficiency improvement, workpiece surface treatment equipment, etc., can solve the problems of unqualified electroplating and high heat treatment cost, achieve energy saving and consumption reduction, electroplating qualification rate of 100%, reduce The effect of production costs

Active Publication Date: 2021-10-29
ANGANG STEEL CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a high surface hardness tool steel with excellent electroplating performance and a production method, which overcomes the disadvantages of high heat treatment cost and unqualified electroplating after omitting the sand blasting process in the existing tool steel, and the produced tool steel has a smooth surface, There is no need for heat treatment, the surface hardness is above 55HRC, there is no grain boundary oxide layer and decarburization layer on the surface, and the surface roughness is ≤0.9R a / μm, the qualified rate of electroplating reaches 100% after omitting the sand blasting process

Method used

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  • High-surface-hardness tool steel with excellent 800MPa electroplating performance and production method
  • High-surface-hardness tool steel with excellent 800MPa electroplating performance and production method
  • High-surface-hardness tool steel with excellent 800MPa electroplating performance and production method

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Embodiment Construction

[0039] The invention is a high surface hardness tool steel with excellent 800MPa electroplating performance. The chemical composition of the tool steel is calculated by weight percentage: C 0.40%-0.60%, Mn 0.4%-1.5%, Ca 0.0005%-0.05%, Mg0.0005%~0.05%, Ba 0.1%~1.0%, Ca / Ba≥0.05, Ca / S≥0.5, Ca / Mg≥1, Cu 0.2%~1.0%, P≤0.020%, S≤0.015%, The balance is Fe and unavoidable impurities.

[0040] like figure 1 As shown, the tool steel has the following organizational characteristics:

[0041] 1) The internal structure of the steel plate is pearlite, the size of the pearlite group is 10μm-20μm, the tensile strength of the matrix is ​​800MPa-900MPa, and the yield ratio is less than 70%;

[0042] 2) There is a troostite layer with CuBaC particles dispersedly distributed under the surface of the steel plate and the distance between the sheets is less than 100nm. The depth of the troostite layer is not less than 10% of the thickness of the steel plate. The maximum diameter of the particles in th...

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Abstract

The invention relates to high-surface-hardness tool steel with excellent 800MPa electroplating performance and a production method. The high-surface-hardness tool steel with the excellent 800MPa electroplating performance comprises the following chemical components in percentage by weight: 0.40-0.60% of C, 0.4-1.5% of Mn, 0.0005-0.05% of Ca, 0.0005-0.05% of Mg, 0.1-1.0% of Ba, greater than or equal to 0.05% of Ca / Ba, greater than or equal to 0.5% of Ca / S, greater than or equal to 1% of Ca / Mg, 0.2-1.0% of Cu, less than or equal to 0.020% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurities. The high-surface-hardness tool steel with excellent 800MPa electroplating performance, which is produced through the production method, has the advantages that the surface is smooth, heat treatment is not needed, the surface hardness is 55 HRC or above, no grain boundary oxide layer or decarburized layerexists on the surface, the surface roughness is smaller than or equal to 0.9 Ra / micron, and the electroplating qualification rate reaches 100% after the slinging process is omitted.

Description

technical field [0001] The invention relates to the technical field of tool steel production, in particular to a hot-rolled high surface hardness tool steel suitable for electroplating and a production method thereof. Background technique [0002] At present, ordinary tool steel is mostly made of medium carbon steel through heat treatment, and the hardness after heat treatment is generally required to be above 37HRC, and in order to prevent corrosion and rust, the surface of the tool needs to be electroplated. For example, the tool steel used for strap buckles is usually processed from 45Mn or 45# steel, and the hardness after heat treatment is generally required to be 37-41HRC. The conventional binding buckle processing procedures are: smelting - hot rolling - cold rolling - annealing - cold rolled sheet stamping - heat treatment - sandblasting - rolling - electroplating - assembly. Among them, not only the cost of cold rolling is high, but also the surface treatment proce...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/16B21B1/46B21B45/02B21B45/08B22D11/16C22C33/04
CPCC22C38/04C22C38/002C22C38/16C22C33/04B22D11/16B21B1/463B21B45/08B21B45/0218B21B2201/06C21D2211/009Y02P10/20
Inventor 杨玉王英海张吉富任俊威丛志宇乔磊马锋王杰
Owner ANGANG STEEL CO LTD
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