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Cast high-boron high-speed steel for composite ring roller and heat treatment method thereof

A heat treatment method and composite roll technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of large differences in the specific gravity of alloy elements, difficult to solve composition segregation, and easy cracks, etc., to achieve high product hardness and universal equipment Strong resistance and good thermal cracking resistance

Active Publication Date: 2008-08-13
HUNAN 3T NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In actual production, high-speed steel rolls are mainly produced by centrifugal casting. Due to the large difference in the proportion of alloying elements, it is difficult to solve the problem of composition segregation.
At the same time, in the actual use of high-speed steel rolls, there are mainly cracks and peeling off.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Strip work roll

[0073] The cast high-boron high-speed steel described in this embodiment is used as the roll ring, and is melted in an acidic medium-frequency induction furnace with a nominal capacity of 500 kg. Using scrap steel, ferro-boron, ferro-vanadium, ferro-molybdenum, ferro-chromium, ferrosilicon and ferro-manganese as ingredients, after adjusting the ingredients before the furnace to meet the requirements, add rare earth and ferro-titanium for deoxidation and modification, and it is released at 1650°C. Put the preheated seamless steel pipe in the sand mold and cast it at 1500°C. The chemical composition of the product alloy is:

[0074] C=0.38%, B=2.2%, V=5.67%, Si=0.66%, Mn=0.83%,

[0075] Cr=4.3%, W=2.05%, Mo=3.13%, Nb=0.05%, Ti trace,

[0076] S=0.023%, P=0.030%, and the balance is Fe.

[0077] The heat treatment method is as follows: high-boron high-speed steel is cast as the composite roll ring and then heat-treated. The annealing process is heating ...

Embodiment 2

[0083] Finished bar rack rolls

[0084] The cast high-boron high-speed steel described in this embodiment is smelted in an acid medium-frequency induction furnace with a nominal capacity of 500 kg as the ring of the composite roll. Scrap steel, ferroboron, ferrovanadium, ferromolybdenum, ferrotungsten, ferrochrome, ferrosilicon and ferromanganese are used as ingredients. After adjusting the composition before the furnace, rare earth and ferro-titanium are added for deoxidation and modification, and it is released at 1650°C. Place the preheated seamless pipe in the sand mold and cast at 1500°C. The chemical composition of the product alloy is:

[0085] C=0.32%, B=1.8%, V=3.22%, Si=0.76%, Mn=0.73%,

[0086] Cr=4.8%, W=0.55%, Mo=2.13%, Nb=0.0%, Ti trace,

[0087] S=0.018%, P=0.03%, and the balance is Fe.

[0088] The heat treatment method is:

[0089] The cast high-boron high-speed steel composite roll ring is then subjected to heat treatment. The annealing process is heatin...

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Abstract

The invention discloses a casting high-boron high-speed steel for manufacturing a composite roll ring roller and hot processing method thereof. The steel is a wear-resistant material having superior thermal-shock resistance, and can be applied to other suitable working conditions. The chemical compositions of the steel are (weight%): 0.20 to 1.10 of C, 1.0 to 2.5 of B, 3.0 to 5.0 of Cr, 0.5 to 0.9 of Si, 0.6 to 1.3 of Mn, 2.0 to 10.0 of V, 0.5 to 1.5 of Ni, 1.0 to 4.0 of Mo, 0.2 to 4.0 of W, 0.1 to 2.0 of Nb, less than 0.04 of S, less than 0.04 of P and residue of Fe. The hot processing method includes annealing, quenching and 2 to 3 times of temper. The annealing heating temperature is 800 to 860 DEG C, furnace cooling or air cooling is carried out after furnace cooling to less than 500 DEG C; the quenching heating temperature is 1020 to 1150 DEG C, wind cooling or air cooling is carried out thereafter; 2 to 3 times of temper are carried out, the heating temperature is 500 to 550 DEG C, furnace cooling or air cooling is carried out thereafter. Compared with traditional high-nickle-chrome-molybdenum roller, the roller of the invention greatly improves alloy wearing resistance, heat resistance and thermal-shock resistance, and reduces thermal endurance crack phenomena appearing during use, as well as pits and crack arising therefrom, embodying good organic combination of safety and wearing resistance.

Description

technical field [0001] The invention relates to a material for casting high-boron high-speed steel and a heat treatment method thereof. Background technique [0002] my country is the country with the largest roll production and consumption in the world. In the use of rolls, the main failure forms are wear and cracks, followed by collapse and broken rolls. In non-ferrous metal and steel rolling enterprises, rolls are the parts that have the greatest impact on production efficiency and product quality. For this reason, roll manufacturers and related research units in various countries have been exploring roll materials and forming processes. [0003] The high-nickel-chromium-molybdenum infinitely chilled cast iron launched in the 1930s is a milestone in the history of roll material development, and it is still the most widely used roll material. Since then, materials such as high-chromium cast iron, high-chromium steel, high-speed steel, semi-high-speed steel, and cemented ...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D9/38
Inventor 向勇李聚良陈牧原郑星李苏人
Owner HUNAN 3T NEW MATERIAL
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