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A method for improving toughness of alloy steel

A technology of alloy steel and toughness, applied in the field of providing toughness of alloy steel, can solve the problems of complex preparation process and increased cost, and achieve the effects of good strength and toughness, reducing surface oxidation, and reducing deformation and cracking tendency.

Inactive Publication Date: 2017-10-27
玉田县前进汽车悬架有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of elements in the alloy often brings disadvantages such as increased cost and complicated preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Heat the alloy steel at 850°C for 30s, at 800°C for 120s, at 920°C for 60s, stay in the air for 20s, put it in water at 40°C, and when the temperature of the alloy steel cools to 410°C, place it immediately into a mixed solution (sodium chloride 6%, sodium nitrate 1%, potassium sulfate 1.5%) at a temperature of 42°C, and the residence time is 5s. Then, when the surface temperature reaches 160° C. by heating again, spray water with a temperature of 15 to 20° C. thereon. The injection pressure is 0.4MPa, the flow density is 250L / (m 2 s). The injection time is 10s.

[0012] The treated sample is bent at 90-180°, without cracks and without coating falling off.

Embodiment 2

[0014] Heat the alloy steel at 850°C for 30s, at 800°C for 120s, at 920°C for 60s, stay in the air for 20s, put it in water at 35°C, and when the temperature of the alloy steel cools to 390°C, place it immediately into a mixed solution (6% sodium chloride, 1% sodium nitrate, 1.5% potassium sulfate) at a temperature of 40°C, and the residence time is 5s. Then, it was heated again, and when the surface temperature reached 140° C., water at a temperature of 15° C. was sprayed thereon. The injection pressure is 0.01MPa, the flow density is 20L / (m 2 s). The injection time is 2s.

[0015] The treated sample is bent at 90-180°, without cracks and without coating falling off.

Embodiment 3

[0017] Heat the alloy steel at 850°C for 30s, at 800°C for 120s, at 920°C for 60s, stay in the air for 20s, put it in water at 40°C, and when the temperature of the alloy steel cools to 400°C, place it immediately into a mixed solution (6% sodium chloride, 1% sodium nitrate, 1.5% potassium sulfate) at a temperature of 40°C, and the residence time is 5s. Then, it was heated again, and when the surface temperature reached 150° C., water at a temperature of 20° C. was sprayed thereon. The injection pressure is 0.1MPa, the flow density is 100L / (m 2 s). The injection time is 6s.

[0018] The treated sample is bent at 90-180°, without cracks and without coating falling off.

[0019] The impact test was carried out on the above samples, and the results are shown in Table 1

[0020] Table 1

[0021]

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PUM

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Abstract

The invention discloses a method for improving the toughness of alloy steel. The specific steps are: heating the alloy steel at 850°C for 30s; at 800°C for 120s; at 920°C for 60s; In the first cooling medium, when the temperature of the alloy steel is cooled to 390-410°C, put it into the second cooling medium immediately, and then heat it again until the surface temperature reaches 140-160°C, spray the third cooling medium. The alloy steel after quenching and tempering treatment by the method of the invention has better toughness and plasticity.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a method for providing toughness of alloy steel. Background technique [0002] Alloy steel has a history of more than one hundred years. The industrial use of alloy steel was about the second half of the 19th century. At that time, due to the increasing production and use of steel, the machinery manufacturing industry needed to solve the problem of steel processing and cutting. In 1868, the British R.F. Mushet invented self-hardening steel with a composition of 2.5% Mn-7% W. Increase the cutting speed to 5 m / min. With the development of commerce and transportation, a bridge with a span of 158.5 meters was built on the Mississippi River in the United States in 1870 with chromium steel (1.5-2.0% Cr); due to difficulties in processing components, later, some industrial countries switched to nickel Steel (3.5% Ni) is used to build long-span bridges. At the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/25
Inventor 张斌
Owner 玉田县前进汽车悬架有限公司