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Process Control for Structure of Martensite/Austenite Islands of 15.3 mm X100 Pipeline Steel in BX Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 487-491页

作者： XU Xue-li,ZHAO Ke,ZHAO Di,WANG Wen-fei (Technical Center of BX Steel,benxi 117000,liaoning,china) Tech Ctr BX Steel Benxi 117000 Liaoning Peoples R China

This paper mainly studies the influence of deformation amount and cooling rate,which existed in X100 pipeline steel rolled at 2300mm rolling mill in BX STEEL,on morphology,size relations and distribution of M/A islands of steel plate *** results show that structures of M/A islands are homogenized and refined under the conditions of appropriately increasing the deformation amount in non-recrystallization region on basis of rational deformation amount in recrystallization region and cooling rate after deformation,***,according to the actual situation of 2300mm hot rolling mill,this paper gives rational deformation amount and cooling rate used to obtain ideal structure of M/A islands.

关键词： X100 pipeline steel martensite/austenite (M/A) islands deformation amount cooling rate

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 Iron and Steel (Group) Co,Ltd.benxi 117000,liaoning,china) benxi Iron & Steel 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

Effect of Nb,Mo and Ti on the Microstructures and Mechanical Properties of 700MPa Weathering Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 300-305页

作者： WANG Bing 1,SONG Yu-lai 2,WEN Xiao-ming 3,WANG Hou-xin 4,LIU Qing-you 1 (1.Institute for Structural Materials of CISRI,Beijing 100081,china 2.Research and Development Center of Wuhan Iron and Steel (Group) Corp.,Wuhan 430080,Hubei,china 3.benxi Iron and Steel Group Limited Company benxi 117000,liaoning,china 4.CITIC-CBMM Microalloying Technology Center,Beijing 100081,china) Inst Struct Mat CISRI Beijing 100081 Peoples R China Wuhan Iron & Steel Grp Corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China benxi Iron & Steel Grp Ltd Co Benxi 117000 Liaoning Peoples R China CITIC CBMM Microalloying Technol Ctr Beijing 100081 Peoples R China

Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling *** results show the formation of M/A is promoted by Mo,while inhibited by ***,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold *** effect of Nb on increasing the strength of experiment steel is very *** Nb content of 700MPa steel must be higher than 0.05% to ensure the *** optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and *** industry trial production of 700MPa high-strength weathering steel for container was also developed.

关键词： weathering steel Nb Mo Ti mechanical properties M/A island

Development of the steel AISI 4145HM for senior petroleum drill of BX Steel

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Baosteel Technical Research 2010年第S1期4卷 68-页

作者： ZHAO Qianshui benxi Iron & Steel(Group) Co.,Ltd.,benxi 117000,liaoning,china

The Steel AISI 4145HM for senior petroleum drill of BX Steel was produced by the follow sheet: hot metal pretreatment→converter→LF→RH→caster 350 mm×470 mm rectangular billet→hot delivery→reheating→800 mill rolling→insulation→straightening→anneal→grinding→inspection→packaging and pay into treasury→*** BX Steel particular hor metal,adopted hot metal desulphurization pretreatment *** LF refining making the white slag,and keep a certain *** RH treatment must make sure the vacuum degree and refining time,more importantly controlling argon blowing *** addition,must design proper technology data continuous casting similar superheat,casting speed,and specific water flow *** on technological measures,the product been had series of the qualities:homogeneity of chemical composition,low content of harmful elements,high purity,compact *** the process of casting billet hot delivery and hot charging,used stepping heating furnace,and designing reasonable thermal *** -high reversing mill rough rolls preparation square billet,short - stress - path rolling mill rolls round *** products bad holding and controlling soaking time and temperature. Steel products bad annealed,and annealing process must been controlled for ensuring steel hardness uniform. For avoiding residual stress,steel been straightened before *** test results and using effect shows that the producing with uniform annealing hardness and nice processing properties,nice overall mechanical properties,were recognized by users.

关键词： AISI 4145H converter continuous casting

Effect of Nb,Mo and Ti on the Microstructures and Mechanical Properties of 700MPa Weathering Steel

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Effect of Nb,Mo and Ti on the Microstructures and Mechanical...

Production of 48MnV-C non-heat treatment crankshaft steel by means of converter plus continuous casting and hot-rolling process

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作者： WANG Bing~1,SONG Yu-lai~2,WEN Xiao-ming~3,WANG Hou-xin~4,LIU Qing-you~1 (1.Institute for Structural Materials of CISRI,Beijing 100081,china 2.Research and Development Center of Wuhan Iron and Steel(Group)Corp.,Wuhan 430080,Hubei,china 3.benxi Iron and Steel Group Limited Company benxi 117000,liaoning,china 4.CITIC-CBMM Microalloying Technology Center,Beijing 100081,china)

Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness, tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling *** results show the formation of M/A is promoted by Mo,while inhibited by ***,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold *** effect of Nb on increasing the strength of experiment steel is very *** Nb content of 700MPa steel must be higher than 0.05%to ensure the *** optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and *** industry trial production of 700MPa high-strength weathering steel for container was also developed.

关键词： weathering steel Nb Mo Ti mechanical properties M/A island

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Baosteel Technical Research 2010年第S1期4卷 62-页

作者： LU Bingjun,DONG Xuetao and YU Wentao Technology Center of Bengang Steel Plates Co.,Ltd.,benxi 117000,liaoning,china

48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C *** mainly adopts the technology of V—N micro-alloying,at present,it has been successfully used in making crankshaft of heavy duty truck *** STEEL made trial production by means of converter→secondary metallurgy(RH + LF)→rectangular slab caster→hot rolling process,and studied the T[O],T[N],[H]and non-metal inclusion in 48MnV - C steel under continuous casting process condition,the actual grain size and the slab *** the chemical compositions and test results met the needs of Cummings Crankshaft Steel *** order to ensure the mechanical properties of the non-heat treatment steel,a certain amount of nitrogen is added to it,also a small amount of sulfur is added to improve the cutting property of the *** process route can make full use of the de-hydrogen function of RH,and during RH treatment,rough adjustment of alloy elements may be made while the adjustment of Nitride Manganese nitrogen pick up and adjusting Mn,as well as Ca treatment and S content adjustment may be done during LF treatment so as to ensure the requirement of high nitrogen,low hydrogen,low oxygen content in 48MnV-C *** marks are defects shown in magnetic powder testing after the steel was used to make finished *** 48MnV - C non-heat treatment crankshaft steel produced by means of the above-mentioned process route has not only relatively high robust performance which meets the needs of truck crankshaft safety,but also high qualification rate and basically no "magnetic marks" are found after being made into finished crankshafts,which meets the crankshaft ***,this steel has been widely used in domestic crankshaft industry.

关键词： converter continuous casting non-heat treatment crankshaft steel magnetic mark

Analysis on the Variation Characteristics of Temperature and Precipitation in benxi Area under the Background of Climate Warming

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Meteorological and Environmental Research 2011年第7期2卷 12-14,18页

作者： LI Zhen,JI Qi benxi Meteorological Bureau in liaoning Province,benxi 117000,china

[Objective] The research aimed to study the variation characteristics of temperature and precipitation in benxi area under the background of climate warming.[Method] Based on the monthly mean temperature and precipitation data of four routine meteorological stations in benxi area from 1953 to 2010,by using linear tendency rate,linear regression equation,wavelet analysis,Mann-Kendall detection and so on,the variation characteristics of temperature and precipitation under the background of climate warming in the area were analyzed.[Result] The annual average temperature during 1953-2010 in benxi area presented rise trend,and the linear tendency rate was 0.28 ℃/10 *** was temperature increase trend in four *** temperature rise rate in winter was the maximum and was the minimum in *** annual rainfall presented decrease trend,and the linear tendency rate was-18.16 mm/10 *** in spring,it was decrease trend in other ***-Kendall mutation detection showed that the mutation of annual average temperature in benxi area in recent 58 years appeared in *** was no mutation phenomenon in *** mutation appeared in 1974,and autumn mutation appeared in *** mutation was in *** annual and seasonal precipitation didn’t have the mutation *** wavelet analysis found that the annual average temperature had the periodic variations of 12-14,5-6 and 2 years in benxi area in recent 58 *** annual rainfall had the periodic fluctuations of 8-12,5-6 and 2 years.[Conclusion] The research provided the scientific basis for exploration and sustainable development of the climate resources in the mountain area.

关键词： Climate warming Temperature Precipitation Variation characteristic Trend analysis benxi area china

Analysis on Change Characteristics of Sunshine in benxi Mountainous Area in Recent 57 Years

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Meteorological and Environmental Research 2011年第10期2卷 55-58页

作者： TAN Xiang,JI Qi benxi Meteorological Bureau of liaoning Province,benxi 117000,china

[Objective] This study aimed to analyze the change characteristics of sunshine hours in benxi mountainous area in recent 57 years.[Method] Based on the data of monthly sunshine hours,total cloudiness,vapor pressure and ≥0.1 mm precipitation days from Caohekou weather station during 1954-2010,by using linear tendency,Mann-Kendall method and wavelet analysis,the change characteristics of sunshine hours in benxi mountainous area in recent 57 years were analyzed,as well as the possible climatic factors resulting in the decrease of sunshine hours.[Result] In recent 57 years,except for the slight increase of sunshine hours in winter,annual sunshine hours and sunshine hours in other seasons showed significantly decreasing trend,and annual sunshine hours varied abruptly in *** addition,total cloudiness,vapor pressure and ≥0.1 mm precipitation days affected sunshine hours obviously,but sunshine hours didn’t simply increase as the reduction of total cloudiness and ≥0.1 mm precipitation days,which showed that the influencing factors of sunshine hours were complex.[Conclusion] The research could provide scientific references for the reasonable utilization of light energy,adjustment of agricultural industrial structure and sustainable development of agricultural economy in mountainous areas.

关键词： Sunshine hours Change characteristics benxi mountainous area china

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 121001, china The Technical Center 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 benxi 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.