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Theoretical calculation of the impact work in the alloying non-quenched and tempered steel

Science china(Technological Sciences) 2006年第3期49卷 257-273页

作者： LIU Zhilin1, LIN Cheng1 & GUO Yanchang2.1. Department of Materials and Chemical Engineering, Liaoning Institute of Technology, Jinzhou 12.001, china 2. the technical center of benxi iron and steel group corporation,{2., china Department of Materials Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China The technical center of {2. iron steel group {2. Benxi 117000 China

Coupled with hot-continuous rolling technology and based on the calculation of the finishing rolling impact work in the non-quenched and tempered Si-Mn steel, the calculations of the finishing rolling impact work in the alloying non-quenched and tempered steel with the elements of Cr, Ni, Mo, W, Cu, V, Nb and Ti are studied with the covalent electron number nA of the strongest bond in alloying phases, the smallest electron density difference ?ρ of phase interfaces, and the number of atom states σ (σ′) which keep the interface electron density continuous. The calculated results show that the finishing rolling impact work of the alloying non-quenched and tempered steel intensely depends on strengthening mechanisms. The solution strengthening, interface strengthening, precipita- tion strengthening of pearlite, and dispersion strengthening will result in the decrease of the finishing rolling impact work; the refinement strengthening, the precipitation strength- ening of V, Nb and Ti in α-Fe-C-V(Nb, Ti), and the residual austenite containing Ni on the boundary of α-Fe-C-Ni will increase the impact work; and the increments or decrements can be calculated with nA, ?ρ, σ (σ′) and weights of alloying elements. The calculation formulas of the finishing rolling impact work in this paper are intergraded with the sug- gested ones of the finishing rolling tensile strength, yield strength, and elongation of the non-quenched and tempered steel. The calculated results agree well with the measured ones.

关键词： alloying non-quenched and tempered steel, electron structure, impact work, calculation.

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Calculation of the yield and tensile strength in the alloying non quenched-tempered steel by the electron structure parameters

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Progress in Natural Science:Materials International 2005年第9期15卷 832-837页

作者： LIU Zhilin1**, LIN Cheng1, LIU Yan1 and GUO Yanchang2.1. Department of Materials and Chemical Engineering, Liaoning Institute of Technology, Jinzhou 12.001, china 2. the technical center of benxi iron and steel group corporation,{2., china) Department of Materials and Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China. technical center of {2. iron and steel group corporation Benxi 117000 China

Based on the phase transformations and strengthening mechanisms during rolling, the strength increments Δσbunder different strengthening mechanisms are calculated with the covalent electron number nAof the strongest bond in phase cells of alloys and the interface electron density difference Δρ matching the interface stress in alloys. The calculation method of the finishing rolling yield strength is proposed, and it is integrated with the proposed calculation formulas of strength of non quenched-tempered steel. Therefore, the general formulas to simultaneously calculate both the finishing rolling strength and the yield strength of the continuous casting-rolling and non quenched-tempered steel are given. Taken the pipeline steel X70 as an example, the predictions of properties and technological parameters are performed before production or online.

关键词： electron structure non quenched-tempered steel yield strength prediction of properties.

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Theoretical calculation of the finishing rolling elongation in alloying non-quenched and tempered steel

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Progress in Natural Science:Materials International 2006年第8期16卷 859-867页

作者： LIU Zhilin, LIN Cheng and GUO Yanchang (Department of Materials and Chemical Engineering, Liaoning Institute of Technology, Jinzhou 12.001, china The technical {2. of benxi iron and steel group corporation, benxi 117000, china) [a]Department of Materials and Chemical Engineering Liaoning Institute of Technology Jinzhou China [b]The technical center of {2. iron and steel group corporation Benxi China

The finishing rolling elongationδof the alloying non-quenched and tempered steel is calculated with the covalent electron number nA of the strongest bond of the alloying phases and the interface electron density differenceΔρof the phase interfaces. The calculations show that the elongationδα-Fe of the matrixα-Fe decreases with rolling refinement, the elongationδα-Fe-C-M of solid solution phases (M denotes alloying element) is inversely proportional to the covalent electron number nAα-Fe-C-M of the strongest bond, the elonga tion decrementΔδα-Fe/α-Fe-C-M caused by interface strengthening is directly proportional to the interface electron density differenceΔρα-Fe/α-Fe-C-M, but the elongation decrementsΔδα-Fe/MCC1 andΔδα-Fe-C/MCC2.caused by dispersion strengthening and precipitation strength- ening respectively are directly proportional to the ratio of the electron density differenceΔρα-Fe/MCC1 andΔρα-Fe/MCC2.of the strengthening interfaces toΔρα-Fe/α-Fe-C of the basic interfaceα-Fe/α-Fe-C. Therefore, the finishing rolling elongation of the alloying non-quenched and tempered steel is considered to be subtracting all the elongation decrements of solution strengthening, interface strengthening, dispersion strengthening and precipitation strengthening from the elongation of the refinedα-Fe matrix. The calculation formulas in this paper are integrated with the proposed ones ofσS,σb and ofαK delivered in another paper, the finishing rolling mechanical properties can be achieved and the calculated results agree well with the measured ones.

关键词： electron structure parameters alloying non-quenched and tempered steel elongation theoretical calculation.

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Development of 600MPa Cold Rolled Dual Phase steel for Automotive Application in BX steel

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Journal of iron and steel Research International 2011年第S1期18卷 987-989页

作者： GAO Hong-gang,CHEN Li-hong,LIU Ming-hui,YU Wen-tao,WANG Ya-fen (Technology center of benxi {2. and steel (group) Co,Ltd.benxi 117000,Liaoning,china) benxi iron & {2. Grp Co Ltd Ctr Technol Benxi 117000 Liaoning Peoples R China

BX steel has developed 600MPa cold rolled dual phase in order to adapt to the market *** paper introduces the design of chemical composition,hot rolling,cold rolling and annealing process of experimental *** finished product property meets the technical standard,the microstructure is typical dual phase,F+M(14-16%).This product has been produced commercially in BX steel,and has been approved by end users.

关键词： automotive application dual phase microstructure

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Calculation of the end-rolling strength in Q2.5strip steel by the alloying electron structure parameters

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Progress in Natural Science:Materials International 2005年第3期 60-65页

作者： LIU Zhilin 1 ,LIN Cheng 1ˇˇ ,LIU Yan 1 and GUO Yanchang 2. (1.Department of Materials and Chemical Engineering,Liaoning Institute of Technology,Jinzhou12.001,china 2.The technical {2. of benxi iron and steel group corporation,benxi117000,china) Department of Materials and Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China The technical center of {2. iron and steel group corporation Benxi 117000 China

Combined with the phase transformations in rolling,the phase configuration,the tensile strength,and the yield strength with different terminal rolling grain sizes in Q2.5strip steel have been theoretically calculated using the covalent electron number(n A )of the strongest bond in phase cells and the interface electron density difference(Δρ)in *** calculated results agree well with the results of real ***,the calculation method of terminal rolling tensile and yield strength in the non-quenched-tem-pered steel containing pearlite is given by the alloying electron structure parameters.

关键词： alloying electron structure parameter hot-continuous rolling structure properties calculation.

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含稀土高抗挤毁石油套管的研制

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稀土 2010年第2期31卷 13-19页

作者：贺景春郭智韬丰小冬包头钢铁(集团)有限责任公司技术中心内蒙古包头014010

在充分了解油田实际使用工况的基础上,通过科研攻关,成功开发了一种含稀土高抗挤毁石油套管BT110T,并在国家石油管材质量监督检验中心进行了拉伸性能、冲击韧性、残余应力、金相分析、上卸扣试验、拉伸至失效试验、静水压试验、外压至... 详细信息

在充分了解油田实际使用工况的基础上,通过科研攻关,成功开发了一种含稀土高抗挤毁石油套管BT110T,并在国家石油管材质量监督检验中心进行了拉伸性能、冲击韧性、残余应力、金相分析、上卸扣试验、拉伸至失效试验、静水压试验、外压至失效试验等实物质量评价,结果表明,工艺措施合理可行,各项指标均达到设计值和API系列标准要求,两个试样的抗挤毁强度分别超过API BUL 5C2.定值的40%和46%,并在中石化西南油气分公司成功完成下井试验。

关键词： BT110T 高抗挤毁石油套管抗挤毁强度

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