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Roll ring steel for aluminium casting rolling mill and heat treatment method thereof

A technology of final heat treatment and roller sleeves, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as fatigue cracks, bursts, economic losses, etc., to improve the ability to resist thermal fatigue cracks, increase service life, and reduce production costs Effect

Inactive Publication Date: 2005-03-16
李春治
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the existing roller sleeves is unstable, and sometimes bursts occur during the working process, and sometimes abnormal fatigue cracks appear, resulting in the scrapping of the roller sleeves and causing huge economic losses
The reason is that the production process of the roller sleeve is unreasonable due to the poor crack resistance of the roller sleeve material

Method used

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  • Roll ring steel for aluminium casting rolling mill and heat treatment method thereof
  • Roll ring steel for aluminium casting rolling mill and heat treatment method thereof
  • Roll ring steel for aluminium casting rolling mill and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Steel is made in a 26-ton electric arc furnace, and two 13.2-ton octagonal steel ingots (steel ingots for free forging) are poured. The steel-making raw materials are mainly selected scrap steel, steel-making pig iron, and corresponding ferroalloys. The total weight of raw materials for each furnace is 33 tons. The deoxidation of molten steel uses Si-Ca iron instead of aluminum deoxidation. The molten steel also needs to be refined in a 30-ton ladle refining furnace. During the refining process, fine-tuning of components and vacuum refining and degassing are carried out. The vacuum degree is <133Pa, and the degassing time is 12 minutes. The final chemical composition (weight percent) of molten steel is: C 0.43, Mn 0.76, Si 0.39, P 0.012, S 0.008, Cr 2.80, Ni 0.90, Mo 1.10, V 0.18, Al 0.01, and the rest are iron and other impurities.

[0015] The steel ingot is forged on a 2,500-ton hydraulic press to form two cylindrical forging blanks with an outer diameter of 1,000m...

Embodiment 2

[0020] Steel is made in a 26-ton electric arc furnace, and two 13.2-ton octagonal steel ingots (steel ingots for free forging) are poured. The steel-making raw materials are mainly selected scrap steel, steel-making pig iron, and corresponding ferroalloys. The total weight of raw materials for each furnace is 33 tons. The deoxidation of molten steel uses Si-Ca iron instead of aluminum deoxidation. The molten steel also needs to be refined in a 30-ton ladle refining furnace. During the refining process, fine-tuning of components and vacuum refining and degassing are carried out. The vacuum degree is <133Pa, and the degassing time is 12 minutes. The final chemical composition (weight percent) of molten steel is: C 0.38, Mn 0.70, Si 0.35, P 0.011, S 0.008, Cr 2.40, Ni 0.70, Mo 0.95, V 0.15, Al 0.01, and the rest are iron and other impurities.

[0021] Each steel ingot is forged on a 2,500-ton hydraulic press to form two cylindrical forging billets with an outer diameter of 730m...

Embodiment 3

[0025] Steel is made in a 26-ton electric arc furnace, and two 13.2-ton octagonal steel ingots (steel ingots for free forging) are poured. The steel-making raw materials are mainly selected scrap steel, steel-making pig iron, and corresponding ferroalloys. The total weight of raw materials for each furnace is 33 tons. The deoxidation of molten steel uses Si-Ca iron instead of aluminum deoxidation. The molten steel also needs to be refined in a 30-ton ladle refining furnace. During the refining process, fine-tuning of components and vacuum refining and degassing are carried out. The vacuum degree is <133Pa, and the degassing time is 12 minutes. The final chemical composition (weight percent) of molten steel is: C 0.32, Mn 0.62, Si 0.30, P 0.012, S 0.009, Cr 2.20, Ni 0.65, Mo 0.83, V 0.16, Al 0.01, and the rest are iron and other impurities.

[0026] Each steel ingot is forged on a 2,500-ton hydraulic press to form three cylindrical forging blanks with an outer diameter of 690...

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Abstract

The invention relates to a roll ring steel for aluminum casting rolling mill and its heat treatment method. Chemical ingredient weight percentage of roll ring steel for aluminum casting rolling mill are : C 0.30-0.45, Mn 0.60-0.80, Si 0.20-0.40, P <=0.025, S <=0.025, Cr 2.00-3.00, Ni 0.50-1.00, Mo 0.80-1.20, V 0.10-0.20, Al <=0.012, surplus being ferrum and other impurity. The final heat treatment method of roll ring steel adopt second tempering after quenching. Quenching temperature is 850-920 DEG C , and proceeding in engine oil after heat preservation. In first tempering, roll ring is heated to 500-560 DEG C , insulated 10-20 hours, cooled in engine oil. The second tempering parameters are same with that of first tempering. The invention promotes anti heat fatigue crack capability of roll ring, so promotes the life of roll ring.

Description

(1) Technical field [0001] The invention relates to a roll sleeve steel for aluminum casting and rolling mills and a heat treatment method thereof. (2) Background technology [0002] In the 1980s, my country began to adopt casting and rolling technology and equipment in aluminum processing and production. From the late 1990s to the first three years of the 21st century, the production of cast-rolling aluminum coils in my country experienced a rapid development. New casting and rolling machines are continuously put into production, but the technical level of casting rolls, a key component in casting and rolling machines, lags behind developed countries by about 20 years. The roll sleeve is an alloy steel cylinder on the casting roll, which is shrunk on the roll core to form the casting roll. See figure 1 . The roll sleeve is also the working part of the casting roll. When the molten aluminum flows on the roll sleeve, it solidifies into solid aluminum and is rolled into a st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C22C38/46
Inventor 李春治
Owner 李春治
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