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Strengthened steel pill

A technology for strengthening steel and steel shot, which is applied in the direction of abrasives, metal processing equipment, manufacturing tools, etc., can solve the problems of shot blasting hollow surface, large hardness deviation, easy to break, etc., and achieve high consistency of element ratio and small difference in surface shape , the effect of high surface strength

Inactive Publication Date: 2009-01-07
江苏新大奇金属材料科技有限公司
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Problems solved by technology

The main defects of shot blasting produced by these two methods are that the proportion of elements is not easy to control, and the hardness deviation is large
At the same time, the density and surface shape deviation of shot blasting are also very large, and this type of shot blasting is also prone to hollow and surface microcracks.
Therefore, this kind of shot blasting products have insufficient impact resistance and friction resistance during shot blasting or shot blasting, are easy to break, and have a short service life.
Especially when it is used for shot blasting and strengthening treatment of high-strength steel, such as for metal surface treatment in large aircraft manufacturing, aerospace, automobile, motorcycle, shipbuilding, transmission, spring manufacturing and other industries, the disadvantages are particularly prominent. The strengthening effect of changing the surface stress state of the workpiece, hardening the surface of the workpiece, and improving the wear resistance and fatigue resistance of the part will not have the desired effect

Method used

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Embodiment Construction

[0017] A kind of strengthened steel shot, its weight percentage is composed of carbon 0.75-0.80%, manganese 0.48-0.58%, silicon 0.22-0.26%, sulfur 0.001-0.006%, phosphorus 0.011-0.015%, and the balance is iron and unavoidable impurities .

[0018] The average hardness is 640HV, and the hardness deviation range is ±25HV.

[0019] Reinforced steel shot can be divided into four categories according to the shape:

[0020] Cylindrical type - code-named Z;

[0021] Ellipse - code-named G1;

[0022] Quasi-spherical type - code-named G2;

[0023] Ball type - code-named G3.

[0024] The production process of above-mentioned reinforced steel shot is:

[0025] Material selection→drawing→cutting→sieving→testing→storage,

[0026] Or: material selection→wire drawing→cutting→surface rounding strengthening→sieving→testing→storage.

[0027] The selection of materials refers to the selection of elemental components according to the percentage by weight: 0.75-0.80% of carbon, 0.48-0.58% o...

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Abstract

The invention provides strengthening steel shot, and relates to a metal product, in particular to blast shot used for metal surface treatment. The steel shot is characterized in that the steel shot comprises the following components by the weight percentage as follows: 0.45 to 0.85 percent of carbon, 0.30 to 1.30 percent of manganese, 0.15 to 0.35 percent of silicon, sulfur less than or equal to 0.050 percent, and phosphorus less than or equal to 0.040 percent, with iron and inevitable impurities in balancing amount; the average hardness determined under a load is 640HV plus or minus 30HV, and the hardness deviation range is plus or minus 25HV. The strengthening steel shot has the advantages of high consistency of the proportion between the density and elements, smaller hardness deviation ratio, no hollow core and surface crack phenomena, small surface shape difference, high surface strength and good durability. Furthermore, the strengthening steel shot is particularly suitable for surface treatment of high-level workpieces.

Description

technical field [0001] The invention relates to a metal product, in particular to shot blasting for metal surface treatment. technical background [0002] There are two main production processes for shot blasting products such as steel shot, cast steel shot or reinforced steel shot currently produced and used in my country, one is extracted from scrap steel and iron mud, and the other is produced by atomization. The main defects of the shot blasting produced by these two methods are that the proportion of elements is not easy to control, and the hardness deviation is large. At the same time, the density and surface shape deviation of shot blasting are also very large, and this type of shot blasting is also prone to hollow and surface micro-cracks. Therefore, this type of shot blasting product has insufficient impact resistance and friction resistance during shot blasting or shot blasting, is easily broken, and has a short service life. Especially when it is used for shot b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C11/00
CPCB24C11/00B24C1/10
Inventor 冯艳华王奇王静邱锋
Owner 江苏新大奇金属材料科技有限公司
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