CN101168816A - Composite rear earth alterant used for thermal fatigue resisting steel - Google Patents
Composite rear earth alterant used for thermal fatigue resisting steel Download PDFInfo
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- CN101168816A CN101168816A CNA2007101905519A CN200710190551A CN101168816A CN 101168816 A CN101168816 A CN 101168816A CN A2007101905519 A CNA2007101905519 A CN A2007101905519A CN 200710190551 A CN200710190551 A CN 200710190551A CN 101168816 A CN101168816 A CN 101168816A
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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
A kind of additive that the present invention relates to use in the alloy steel material, especially a kind of composite rare-earth modifier that is used for heat-resistant anti-fatigue steel.
Background technology
The high temperature steel purposes is increasingly extensive, is mainly used in to make steel smelting equipment, hot-work and Equipment for Heating Processing etc.Many component of steel smelting equipment all are in the effect work of alternating hot and cold load, because the heat-resistant anti-fatigue performance is not high, cause these parts very easily to damage.At present, research for the heat-resistant anti-fatigue performance that improves steel is less, document [1] (Sun Xiangming, Lv Songqiang, Zhang Zengguang. niobium, nitrogen, cerium are to the high temperature steel Effect on Performance, special steel .2002,16～18.) and document [2] (Jiang Hanxiang 23 (3):, Zhen Tao, Wang Shaona. the development of super low sulfur high temperature steel H2, the journal .2002 of University Of Chongqing, 25 (4): 134～136.), tentatively inquired into the influence of part element to the resistance toheat and the high-temperature behavior of steel, but do not related at the resistance toheat concrete measure that improves steel, breakthrough is little.The heat-resistant anti-fatigue performance that improves material is significant for elongated component work-ing life and raising equipment complete machine operation stability.
Summary of the invention
The present invention proposes a kind of composite rare-earth modifier that is used for heat-resistant anti-fatigue steel.With this kind alterant material being carried out refinement and denaturation handles, utilize that mutual and metamorphism take place the different-alloy element in itself and the steel alloy, the component thermal fatigue property is obviously improved, finally obtain the good high temperature steel of heat-resistant anti-fatigue performance, its thermal fatigue property significantly improves than common high temperature steel.
The present invention relates to a kind of composite rare-earth modifier that is used for heat-resistant anti-fatigue steel, it is characterized by: its chemical ingredients (weight percent) is: RE is 40～62.1% (wherein, Y is 52～99.9% of a RE weight, surplus is other rare earth element), B is 3～7.2%, Nb is 6.2～15.1%, V is 2.3～6%, Ca is 2～13.2%, and Ba is 3.1～11%, and surplus is an iron.Described alterant is block canescence alloy, size range 0.5～50mm, 1200～5000 ℃ of melting ranges.
The above-mentioned composite rare-earth modifier that is used for heat-resistant anti-fatigue steel, composition can be preferably: RE is 59.1～68.2% (wherein, Y is 55～62.5% of a RE weight, surplus is other rare earth element), B is 6.5～7.2%, Nb is 13～15.1%, V is 2.3～3%, Ca is 7～8%, and Ba is 2～4%, and surplus is an iron.Described alterant is block canescence alloy, size range 0.5～50mm, 1200～5000 ℃ of melting ranges.
The present invention utilizes the rare earth resources of China, promotes steel product quality, and alterant is aided with multiple alloying element, when avoiding being used alone alterant element the material over-all properties is improved unconspicuous shortcoming; Mutual and metamorphism take place in the different-alloy element in compound rare-earth and the steel, alleviate the harm of P, S, H, O, reach cleaning molten steel, remove impurity, crystal grain thinning, strengthen matrix, improve carbide morphology and distribution, tissue is optimized, performance is obviously improved, and can postpone the time that crackle produces effectively, reduces crack growth rate; Can reduce or replace the use of molybdenum in the alloy, nickel, copper, reduce production costs, when significantly improving the heat-resistant anti-fatigue performance, can obviously improve impelling strength, intensity and the wear resistance of material, thereby prolong the service life that is subjected to cold and hot repeated load effect alloy, improve the material use properties comprehensively.
Embodiment
Embodiment 1:
To molten steel with certain composition, the processing of going bad of the composite rare-earth modifier of using heat-resistant anti-fatigue steel, composite rare-earth modifier chemical ingredients (weight percent) is: RE is 55% (wherein, Y is 52% of a RE weight, and surplus is other rare earth element), B is 5.1%, Nb is 10%, and V is 6%, and Ca is 2%, Ba is 11%, and surplus is an iron.Make block canescence alloy, granularity 15mm, fusing point are 1200 ℃.Alloy after rotten the processing is cast into coupon, makes sample then, carry out thermal fatigue test.Test-results sees Table 1.
Embodiment 2:
To with embodiment 1 in the molten steel of identical component, the processing of going bad of the composite rare-earth modifier of using heat-resistant anti-fatigue steel, composite rare-earth modifier chemical ingredients (weight percent) is: RE is 62.1% (wherein, Y is 59% of a RE weight, and surplus is other rare earth element), B is 7.2%, Nb is 15.1%, and V is 2.3%, and Ca is 7.5%, Ba is 3.1%, and surplus is an iron.Make block canescence alloy, granularity 10mm, fusing point are 1350 ℃.Alloy after rotten the processing is cast into coupon, makes sample then, carry out thermal fatigue test.Test-results sees Table 1.
Embodiment 3:
To with embodiment 1 in the molten steel of identical component, the processing of going bad of the composite rare-earth modifier of using heat-resistant anti-fatigue steel, composite rare-earth modifier chemical ingredients (weight percent) is: RE is 40% (wherein, Y is 99.9% of a RE weight, and surplus is other rare earth element), B is 3%, Nb is 6.2%, and V is 5.3%, and Ca is 13.2%, Ba is 9%, and surplus is an iron.Make block canescence alloy, granularity 20mm, fusing point are 1180 ℃.Alloy after rotten the processing is cast into coupon, makes sample then, carry out thermal fatigue test.Test-results sees Table 1.
Comparative Examples:
To with embodiment 1 in the molten steel of identical component, carry out that routine is rotten to be handled, then alloy is cast into coupon, make sample, carry out thermal fatigue test.Test-results sees Table 1.
By table 1 as can be seen, compare with the Comparative Examples that conventional treatment process obtains, alloy embodiment 1, embodiment 2 that handles through composite rare-earth modifier of the present invention and the thermal fatigue resistance of embodiment 3 obviously improve, and are significantly improved than embodiment 1,3 with the thermal fatigue property of the embodiment 2 of preferred component composite rare-earth modifier processing.
Table 1, the contrast of heat-resistant anti-fatigue performance
| The thermal fatigue test number of times | 13000 | 18000 | 21000 | 25000 | 29000 | 35000 | |
| Crack length (mm) | Comparative Examples embodiment 1 embodiment 2 embodiment 3 | 0 0 0 0 | 0.87 0 0 0 | 1.32 0 0 0 | 1.85 1.31 0 0 | 3.15 2.03 0 1.52 | 9.97 2.52 1.06 1.95 |
Claims (2)
1. composite rare-earth modifier that is used for heat-resistant anti-fatigue steel, it is characterized by: the weight percent of its chemical ingredients is: RE is 40～62.1%, and wherein, Y is 52～99.9% of a RE weight, and surplus is other rare earth element; B is 3～7.2%, and Nb is 6.2～15.1%, and V is 2.3～6%, and Ca is 2～13.2%, and Ba is 3.1～11%, and surplus is an iron.
2. the composite rare-earth modifier that is used for heat-resistant anti-fatigue steel according to claim 1 is characterized by: the weight percent of its chemical ingredients is: RE is 59.1～68.2%, and wherein, Y is 55～62.5% of a RE weight; B is 6.5～7.2%, and Nb is 13～15.1%, and V is 2.3～3%, and Ca is 7～8%, and Ba is 2～4%, and surplus is an iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101905519A CN100513608C (en) | 2007-11-30 | 2007-11-30 | Composite rear earth alterant used for thermal fatigue resisting steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101905519A CN100513608C (en) | 2007-11-30 | 2007-11-30 | Composite rear earth alterant used for thermal fatigue resisting steel |
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| Publication Number | Publication Date |
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| CN101168816A true CN101168816A (en) | 2008-04-30 |
| CN100513608C CN100513608C (en) | 2009-07-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732744A (en) * | 2012-07-18 | 2012-10-17 | 镇江忆诺唯记忆合金有限公司 | Method for improving memory performance of CuZnAl memory alloy |
| CN107385146A (en) * | 2017-06-15 | 2017-11-24 | 江苏大学 | A kind of Nb RE B microalloying alterants for mitigating banded structure in steel |
| CN114774627A (en) * | 2022-04-12 | 2022-07-22 | 遂昌德鑫铸钢有限公司 | Special additive for high-chromium wear-resistant castings |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1273319A (en) * | 1970-07-14 | 1972-05-10 | Inst Litia Akademii Nauk Uk Ss | Modifiers for iron-carbon alloys |
| SU522258A1 (en) * | 1975-01-23 | 1976-07-25 | Институт Проблем Литья Ан Украинской Сср | Steel modifier |
-
2007
- 2007-11-30 CN CNB2007101905519A patent/CN100513608C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732744A (en) * | 2012-07-18 | 2012-10-17 | 镇江忆诺唯记忆合金有限公司 | Method for improving memory performance of CuZnAl memory alloy |
| CN107385146A (en) * | 2017-06-15 | 2017-11-24 | 江苏大学 | A kind of Nb RE B microalloying alterants for mitigating banded structure in steel |
| CN114774627A (en) * | 2022-04-12 | 2022-07-22 | 遂昌德鑫铸钢有限公司 | Special additive for high-chromium wear-resistant castings |
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| Publication number | Publication date |
|---|---|
| CN100513608C (en) | 2009-07-15 |
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Granted publication date: 20090715 Termination date: 20101130 |