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Black-scale spring flat steel rolling technological method

A technology of spring steel and flat steel, which is applied in the field of ferrous metal rolling, can solve problems such as adverse effects on steel properties, achieve the effects of improving product surface quality, avoiding environmental corrosion, and simple and effective rolling process

Active Publication Date: 2017-04-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that when the boron element in the steel exceeds a certain amount, it will have an adverse effect on the properties of the steel

Method used

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  • Black-scale spring flat steel rolling technological method
  • Black-scale spring flat steel rolling technological method
  • Black-scale spring flat steel rolling technological method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 rolling process:

[0028] Start rolling temperature / °C 1000, finish rolling temperature / °C 950, upper cooling bed temperature / °C 900, large shear temperature / °C 300, packaging temperature / °C 100, the temperature range from the upper cooling bed to about 550°C is 60°C / min cooling, and then cooling to the packaging temperature at 30°C / min for packaging.

Embodiment 2

[0029] Embodiment 2 rolling process:

[0030] Start rolling temperature / °C 1020, finish rolling temperature / °C 970, upper cooling bed temperature / °C 880, large shear temperature / °C 320, packaging temperature / °C 100, the temperature range from the upper cooling bed to about 550°C is 50°C / min cooling, and then cooling to the packaging temperature at 20°C / min for packaging.

Embodiment 3

[0031] Embodiment 3 rolling process:

[0032] Start rolling temperature / °C 1050, finish rolling temperature / °C 1000, upper cooling bed temperature / °C 900, large shear temperature / °C 350, packaging temperature / °C 120, the temperature range from the upper cooling bed to about 550°C is 50°C / min cooling, and then cooling to the packaging temperature at 15°C / min for packaging.

[0033] Table 1 embodiment and comparative example surface oxide skin electrochemical test result

[0034] rolling process Corrosion potential / V Self-corrosion current / (A / cm 2 )

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Abstract

The invention discloses a black-scale spring flat steel rolling technological method and belongs to the field of black metal rolling. A layer of compact and continuous iron oxide scale with the high ferroferric oxide ratio is formed on the surface of the spring steel rolled through the method, and the spring steel can be well protected against corrosion in the transportation and storage process after leaving a factory. The hot rolling technology comprises the steps that the initial rolling temperature is 1000-1050 DEG C, the final rolling temperature is 950-1000 DEG C, the temperature to a cooling bed is 850-900 DEG C, the large shear temperature is 250-400 DEG C, the packaging temperature is 50-150 DEG C, a rapid cooling way (with the speed of 60 DEG C / min or smaller) is adopted at the temperature interval being about 530-570 DEG C after the spring steel is fed to the cooling bed, then, a slow cooling way (with the speed of 30 DEG C / min or smaller) is adopted for cooling the spring steel to the packaging temperature, and packaging is carried out. The compact and continuous iron oxide scale with the high ferroferric oxide ratio is formed on the surface of the hot-rolled spring steel, has good corrosion resistance and can effectively protect the spring steel against environmental corrosion in the transportation and storage process.

Description

technical field [0001] The invention relates to a black leather spring flat steel rolling process method, which belongs to the field of ferrous metal rolling. Background technique [0002] The main grades of spring steel are 50CrVA, 51CrV4, 60Si 2 Mn, etc., can be used to make springs with high working stress and strict fatigue performance requirements, such as automobile leaf springs, valve springs, etc. In the process of delivery of spring steel after rolling, most of them have no outer packaging. Due to environmental corrosion, the surface of the steel plate will be corroded during storage and transportation, causing quality objections from users. [0003] After spring steel is hot-rolled, the typical surface oxide scale is generally composed of three layers of iron oxides: the outermost thin layer is Fe with a close-packed hexagonal crystal structure. 2 o 3 , red, easy to fall off; the thicker layer in the middle is magnetic black crystal Fe 3 o 4 , by Fe 2+ , Fe ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/32C21D8/00C22C38/54C22C38/20C22C38/42B21B37/74
CPCB21B37/74C21D8/005C22C38/001C22C38/02C22C38/04C22C38/20C22C38/32C22C38/42C22C38/54
Inventor 庞晓露金亚军王艳林高克玮
Owner UNIV OF SCI & TECH BEIJING
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