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Reinforced steel shot and preparation method thereof

A technology for strengthening steel and steel shot, used in manufacturing tools, metal processing equipment, abrasives, etc., can solve the problems of short service life, low fatigue strength, and large hardness deviation of strengthened steel shot, and achieve good surface shape consistency, The effect of high particle size consistency and small hardness deviation

Inactive Publication Date: 2011-07-20
KUSN SPRING METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing reinforced steel shot such as short service life, low wear resistance, low fatigue resistance, large hardness deviation, etc., and provide a kind of steel shot with good wear resistance, long service life, surface Reinforced steel shot with high strength, small hardness deviation, good particle size consistency, and suitable for surface treatment of high-end workpieces and its preparation method

Method used

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  • Reinforced steel shot and preparation method thereof
  • Reinforced steel shot and preparation method thereof
  • Reinforced steel shot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Raw materials: the proportion of elements in the wire rod is composed of 0.8% carbon, 0.75% manganese, 0.2% silicon, 0.02% sulfur and 0.015% phosphorus, and the iron makes up the weight percentage to 100%.

[0063] Preparation:

[0064] 1. According to the above raw material requirements, the material is selected, and the wire is cold drawn for 3 times, and after pickling and two special vacuum annealing heat treatments, the semi-finished steel wire is obtained;

[0065] 2. Wire drawing: After 5-15 cold drawing, it is drawn into steel wires with different diameters between 0.3-2.0mm; the hardness range is HV590±30HV.

[0066] 3. Cutting: Use a wire cutter to cut the steel wire into cylindrical sections with the same diameter. The cut section is required to be flat, burr-free, and tail-free.

[0067] 4. Screening: Screening for different nominal sizes of steel shots. The nominal size of the sieve is 0.3-2.0 mm.

[0068] 5. Conduct hardness, density and fatigue life te...

Embodiment 2

[0080] Raw materials: the proportion of elements in the wire rod is composed of 0.85% carbon, 0.8% manganese, 0.25% silicon, 0.015% sulfur and 0.02% phosphorus, and the iron makes up the weight percentage to 100%.

[0081] Preparation:

[0082] 1. Select materials according to the above raw material requirements, cold draw the wire rod for 5 times, and then go through weak sulfuric acid dipping and vacuum isothermal annealing heat treatment twice to obtain semi-finished steel wire;

[0083] 2. Wire drawing: After 5-15 cold drawing, it is drawn into steel wires with different diameters between 0.3-2.0mm; the hardness range is HV590±30HV.

[0084] 3. Cutting: Use a wire cutter to cut the steel wire into cylindrical sections with the same diameter. The cut section is required to be flat, burr-free, and tail-free.

[0085] 4. Screening after surface rounding and strengthening: Screening for different nominal sizes of steel shots. The nominal size of the sieve is 0.3-2.0 mm.

[...

Embodiment 3

[0097] Raw materials: the proportion of elements in the wire rod is composed of 0.82% carbon, 0.65% manganese, 0.3% silicon, 0.01% sulfur and 0.01% phosphorus by weight percentage, and the iron makes up the weight percentage to 100%.

[0098] The preparation method is the same as in Example 2.

[0099] Thereby four reinforced steel shots of CW, G1, G2 and G3 shapes were obtained. The component weight ratio of the reinforced steel shot is: 0.82% carbon, 0.65% manganese, 0.3% silicon, 0.01% sulfur and 0.01% phosphorus, and iron makes up the weight percentage to 100%.

[0100] The size distribution ratio data of strengthening steel shot is the same as Table 6, and the final passing rate of steel shot is: CW≤0.6%, G1≤0.5%, G2≤0.5%, G3≤0.5%. The standard nominal size range of reinforced steel shot: 0.30-2.0mm. The hardness grade and hardness range of reinforced steel shots are the same as Table 7, and the performance data are shown in Table 9.

[0101] Table 9

[0102]

[01...

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Abstract

The invention discloses a reinforced steel shot which is characterized in that the reinforced steel shot comprises the following components by weight percent: 0.8-0.85% of carbon, 0.65-0.8% of manganese, 0.2-0.3% of silicon, 0.01-0.02% of sulfur, 0.01-0.02% of phosphorus and the balance of iron. The invention further provides a preparation method of the reinforced steel shot. The invention overcomes the defects of short service life, large derivation of hardness, low impact resistance and the like of the existing reinforced steel shot and provides the reinforced steel shot which has great durability and significantly longer service life in comparison with the prior art, high element proportion consistency, high density, small derivation of hardness, good particle size consistency, high surface strength and good surface shape consistency, is particularly applicable to surface treatment of high-end work pieces and can avoid the phenomena of hollow and surface or hidden cracks.

Description

technical field [0001] The invention relates to a metal product and a preparation method thereof, in particular to a reinforced steel shot and a preparation method thereof. Background technique [0002] There are two main production processes for the steel shot, cast steel shot or reinforced steel shot currently produced and used in our country: one is to melt the scrap steel and then add certain other ingredients to make the molten steel atomized or centrifuged. The second is to recycle social waste steel wires (in mining machinery, oil field equipment and waste tires) and cut them into sections. The main defects of the steel shots obtained 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 the steel shot is also very large, and this kind of steel shot is also prone to hollow and surface micro-cracks. Therefore, this type of steel shot product ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D8/06B24C11/00C21D1/773C22C38/04
Inventor 王新波
Owner KUSN SPRING METAL MATERIAL
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