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Composite rear earth alterant used for thermal fatigue resisting steel

A compound rare earth and modificator technology, applied in the field of additives, can solve the problems of fragile parts, little breakthrough progress, and low thermal fatigue resistance, and achieve the goals of refining grains, reducing production costs, and improving material performance Effect

Inactive Publication Date: 2008-04-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many parts of iron and steel smelting equipment work under the action of alternating cold and hot loads. Due to the low thermal fatigue resistance, these parts are extremely easy to damage
At present, there are few studies on improving the thermal fatigue resistance of steel. Literature [1] (Sun Xiangming, Lu Songqiang, Zhang Zengguang. The influence of niobium, nitrogen and cerium on the performance of heat-resistant steel, Special Steel. 2002, 23(3): 16~18.) and literature [2] (Jiang Hanxiang, Zhen Tao, Wang Shaona. Development of ultra-low sulfur heat-resistant steel H2, Journal of Chongqing University. 2002, 25(4): 134~136.), a preliminary discussion of some elements The impact on the heat resistance and high temperature performance of steel, but it does not involve specific measures to improve the heat resistance of steel, and there is little breakthrough progress

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] To the molten steel of same certain composition, the composite rare earth modifier of heat-resistant fatigue steel is used to carry out modification treatment, and the chemical composition (percentage by weight) of composite rare earth modifier is: RE is 55% (wherein, Y is 52% of RE weight, remainder The amount is other rare earth elements), B is 5.1%, Nb is 10%, V is 6%, Ca is 2%, Ba is 11%, and the balance is iron. Made into blocky off-white alloy with a particle size of 15mm and a melting point of 1200°C. The modified alloy is cast into a test bar, and then made into a sample for thermal fatigue test. The test results are shown in Table 1.

Embodiment 2

[0010] To the molten steel of same composition as in embodiment 1, the composite rare earth modifier of application heat-fatigue steel is carried out modification treatment, and compound rare earth modifier chemical composition (percentage by weight) is: RE is 62.1% (wherein, Y is RE weight 59%, the balance is other rare earth elements), B is 7.2%, Nb is 15.1%, V is 2.3%, Ca is 7.5%, Ba is 3.1%, and the balance is iron. It is made into a blocky off-white alloy with a particle size of 10mm and a melting point of 1350°C. The modified alloy is cast into a test bar, and then made into a sample for thermal fatigue test. The test results are shown in Table 1.

Embodiment 3

[0012] To the molten steel of the same composition as in Example 1, the composite rare earth modifier of heat-resistant fatigue steel is used to carry out modification treatment, and the chemical composition (percentage by weight) of the composite rare earth modifier is: RE is 40% (wherein, Y is RE weight % 99.9%, the balance is other rare earth elements), B is 3%, Nb is 6.2%, V is 5.3%, Ca is 13.2%, Ba is 9%, and the balance is iron. It is made into a block gray-white alloy with a particle size of 20mm and a melting point of 1180°C. The modified alloy is cast into a test bar, and then made into a sample for thermal fatigue test. The test results are shown in Table 1.

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Abstract

The invention relates to compound rare earth modification agent used for heat-resistant and anti-fatigue steel, and the agent belongs to addition agent applied to an alloy steel material. The invention is characterized in that the chemical components include the content (mass percentage ratio) that: RE occupies 15 to 17 percent (therein, Y occupies 50 to 71.1 percent of the mass of RE, and La+Ce+Pr+Nb+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu occupies 28.9 to 50 percent of the mass of RE), B occupies 0 to 10 percent, Nb occupies 0 to 17 percent, V occupies 0 to 6 percent, Ca occupies 0.5 to 15 percent, Ba occupies 0 to 15 percent and the residual is iron. The modification agent is block shaped grey alloy, the grain size scope is 0.5 to 50 mm, and the melting point scope is 1200 to 5000 DEG C. The modification agent is used to perform refining modification treatment to the material, and the anti-fatigue performance of the parts can be obviously enhanced, thereby lengthening the service life of the alloy suffering cold and heat alternating load function.

Description

technical field [0001] The invention relates to an additive used in alloy steel materials, in particular to a composite rare earth modifier for heat-resistant fatigue steel. Background technique [0002] Heat-resistant steel is widely used, mainly for the production of iron and steel smelting equipment, thermal processing and heat treatment equipment, etc. Many parts of iron and steel smelting equipment work under the action of alternating cold and hot loads. Due to the low thermal fatigue resistance, these parts are extremely easy to damage. At present, there are few studies on improving the thermal fatigue resistance of steel. Literature [1] (Sun Xiangming, Lu Songqiang, Zhang Zengguang. The influence of niobium, nitrogen and cerium on the performance of heat-resistant steel, Special Steel. 2002, 23(3): 16~18.) and literature [2] (Jiang Hanxiang, Zhen Tao, Wang Shaona. Development of ultra-low sulfur heat-resistant steel H2, Journal of Chongqing University. 2002, 25(4): 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/00
Inventor 司乃潮吴强冯爱新
Owner JIANGSU UNIV
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