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Technology innovations on high quality special steel products

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Baosteel Technical Research 2010年第S1期4卷 87-页

作者： DONG Han~(1)),CHEN Silian~(1)),LAN Denian~(2)) and LIU Zhongdong~(1)) 1) Central Iron & steel Research Institute,Beijing 100081,China 2) Chinese Iron & steel Association,Beijing 100711,China

Because special steels are the basic materials for industrialization,a national R&D program on special steel technology for high quality products have been granted to promote the special steel production and applications since *** then,great progresses have been achieved on ferritic stainless steel sheets,heat resistance steel pipes and tubes,microalloyed forging steel bars,and mould steel forgings for hot working. The ratio of ferritic stainless steel sheets produced by TISCO and Baosteel has been promoted through technology innovations and increased 42%and 48 in 2009 respectively.439M steel sheets have been used to exhaust system,and 444 steel sheets have been applied to kitchen and *** production technologies for heat resistance steel pipes and tubes(T/P92,S3043,S31042 steels) have been developed in Baosteel and Pansteel to meet the market ***,the round bloom technology has been initiated in Xingcheng *** new technologies for microalloyed forging steels,low cost steel bar,and tailored steel and components,were proposed by CISRI based on the understanding of precise chemical composition and segregation *** the applications of microalloyed forging steel bars have been promoted *** researchers have developed high quality mould steel technologies,heavy section forgings of 718 steel,high premium H13 steel blocks and large diameter mandrels used for seamless pipe *** technology innovations of the program could lead to the progress of production technology in special steel sheets,pipes,bars and forgings,and meet the demands from *** the moment,it is actually believed that there still strong requirements for the technology innovations on special steels.

关键词： high quality special steel technology

Study on formation of non-metallic inclusions with lower melting temperatures in extra low oxygen special steels

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Science China(Technological Sciences) 2012年第7期55卷 1863-1872页

作者： WANG XinHua JIANG Min CHEN Bing LI HaiBo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Technical Research Institute Shougang CorporationBeijing 100041China

Investigations were made both in laboratorial and industrial scales on formation of non-metallic inclusions with relatively lower melting temperatures to improve the fatigue property of the special steels which contained extra low *** was found in laboratory studies that steel/slag reaction time largely affected non-metallic inclusions in *** the slag/steel reaction time increasing from 30 to 90 min,inclusions of MgO-Al2O3 spinel were gradually changed into CaO-MgO-Al2O3 system inclusions which were surrounded by lower melting temperature softer CaO-Al2O3 surface *** using high basicity and as much as 41 mass% Al2O3 refining slag,the ratio of the lower melting temperature CaO-MgO-Al2O3 system inclusions was remarkably increased to above 80%.In the industrial experiments,it was found that the inclusions changed in the order of "Al2O3 →MgO-Al2O3 system→CaO-MgO-Al2O3 system" in the secondary refining,and the change from MgO-Al2O3 system to CaO-MgO-Al2O3 system took place from the outside to the *** diffusion of CaO and MgO inside the layer of CaO-MgO-Al2O3 was considered as the controlling step of the inclusion *** LF and RH refining,most inclusions could be transferred to lower melting temperature CaO-Al2O3 and CaO-MgO-Al2O3 system inclusions.

关键词： special steel secondary refining slag non-metallic inclusion melting temperature

Classification of steel based on laser-induced breakdown spectroscopy combined with restricted Boltzmann machine and support vector machine

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Plasma Science and Technology 2022年第8期24卷 71-76页

作者： Qingdong ZENG Guanghui CHEN Wenxin LI Zitao LI Juhong TONG Mengtian YUAN Boyun WANG Honghua MA Yang LIU Lianbo GUO Huaqing YU School of Physics and Electronic-information Engineering Hubei Engineering UniversityXiaogan 432000People's Republic of China Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Faculty of Physics and Electronic Science Hubei UniversityWuhan 430062People's Republic of China

In recent years,a laser-induced breakdown spectrometer(LIBS)combined with machine learning has been widely developed for steel ***,the much redundant information of LIBS spectra increases the computation complexity for *** this work,restricted Boltzmann machines(RBM)and principal component analysis(PCA)were used for dimension reduction of datasets,***,a support vector machine(SVM)was adopted to process feature *** models(RBM-SVM and PCA-SVM)are compared in terms of *** optimization,the accuracy of the RBM-SVM model can achieve 100%,and the maximum dimension reduction time is 33.18 s,which is nearly half of that of the PCA model(53.19 s).These results preliminarily indicate that LIBS combined with RBM-SVM has great potential in the real-time classification of steel.

关键词： laser-induced breakdown spectroscopy restricted Boltzmann machines classification special steel