Chaoyang, China
Chaoyang, China

Time filter

Source Type

Zhang Y.,CITIC Metal Co. | Yao L.,Control Iron and Steel Research Institute, China | Guo A.,CITIC Metal Co. | Zhao S.,Control Iron and Steel Research Institute, China | Wang G.,Tian Di Science Co.
Energy Materials 2014, Conference Proceedings | Year: 2014

Coal, as the most major energy in China, accounted for about 70% of China's primary energy production and consumption. While the percentage of coal as the primary energy mix would drop in the future due to serious smog pollution partly resulted from coal-burning, the market demand of coal will maintain because the progressive process of urbanization. In order to improve productivity and simultaneously decrease safety accidents, fully-mechanized underground mining technology based on complete equipment of powered support, armored face conveyor, shearer, belt conveyor and road-header have obtained quick development in recent years, of which powered support made of high strength steel plate accounts for 65 percent of total equipment investment, so, the integrated mechanical properties, in particular strength level and weldability, have a significant effects on working service life and productivity. Take hydraulic powered supports as example, this paper places priority to introduce the latest development of high strength steel plates of Q550, Q690 and Q890 for powered supports, as well as metallurgical design conception and production cost-benefits analysis between QT plate and TMCP plate. Through production and application practice, TMCP or DQ plate demonstrate great economic advantages compared with traditional QT plate.


Zhang Y.,CITIC Metal Co. | Shang C.,University of Science and Technology Beijing | Guo A.,CITIC Metal Co. | Zheng L.,Baosteel | And 2 more authors.
Energy Materials 2014, Conference Proceedings | Year: 2014

In order to solve the pollution problem emerging in China recently, China's central government is making great efforts to raise the percentage of natural gas consumption in the China's primary energy mix, which needs to construct big pipelines to transport natural gas from the nation's resource-rich western regions to the energy-starved east, as well as import from the Central Asia and Russia. With this mainstream trend, high strength, high toughness, heavy gauge, and large diameter pipeline steels are needed to improve the transportation efficiency. This paper describes the latest progresses in Nb-bearing high strength pipeline steels with regard to metallurgical design, development and application, including X80 coil with a thickness up to 22.0mm, X80 plate with a diameter as much as 1422mm, X80 plate with low-temperature requirements and low-Mn sour service X65 for harsh sour service environments. Moreover, based on widely accepted TMCP and HTP practices with low carbon and Nb micro-alloying design, this paper also investigated some new metallurgical phenomena based on powerful rolling mills and heavy ACC equipment.


Zhang Y.,CITIC Metal Co. | Aimin G.,CITIC Metal Co. | Chengjia S.,University of Science and Technology Beijing | Liu Q.,Control Iron and Steel Research Institute, China | And 2 more authors.
7th International Conference on High Strength Low Alloy Steels, HSLA Steels 2015, International Conference on Microalloying 2015, Microalloying 2015 and International Conference on Offshore Engineering Steels 2015, OES 2015 | Year: 2015

Over the past twenty years, significant advances have been made in the field of microalloying and associated application, among which one of the most successful application cases is HTP practice for heavy gauge, high strength pipeline steels. Combined the strengthening effects of TMCP and retardation effects of austenite recrystallization with increasing Nb in austenite region, HTP conception with low carbon and high niobium alloy design has been successfully applied to develop X80 coil with a thickness of 18.4mm used for China's Second West-East pipeline. During this process, big efforts were made to further develop and enrich the application of microalloying technology, and at the same time the strengthening effects of Nb have been completely unfolded and fully utilized with improved metallurgical quality and quantitative analysis of microstructure. In this paper, the existing status and strengthening effect of Nb during reheating, rolling, cooling and welding have been analyzed and characterized based on mass production samples and laboratory analysis. As confirmed, grain refinement remains the most basic strengthening measure to reduce the microstructure gradient along the thickness, which in turn enlarges the processing window to improve upon low temperature toughness, and finally make it possible to develop heavy gauge, high strength pipeline steels with more challenging fracture toughness requirements. As stated by a good saying that practice makes perfection. Based on application practice and theoretical analysis, HTP has been extended to develop heavy gauge and high strength pipeline steels with increasing requirements, including X80 SSAW pipe with a thickness of 22.0mm and above, X80 LSAW pipe combining heavy gauge and large diameter, heavy gauge X80 LSAW pipe with low temperature requirements, as well as X90 steels. In this paper, alloy design, production processing, as well as mechanical properties and microstructure used for these products would be illustrated.


Huo C.,China National Petroleum Corporation | Zhang Y.,CITIC Metal Co. | Guo A.,CITIC Metal Co. | Barbaro F.J.,CBMM Technology Suisse | Malcolm Gray J.,Microalloyed Steel Institute
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2016

Over the past twenty years, significant advances have been made in the field of microalloymg and associated application sectors, among which one of the most successful application cases is HTP (High Temperature process) practice for heavy gauge, high strength pipeline steels. Combined the strengthening effects of TMCP (fherrno Mechanical Control Process) and retardation effects of austemte recrystallization with increasing Nb in austemte region, HTP conception with low carbon and high niobium alloy design has been successfully applied to develop X80 coil with a thickness of 18.4mm used for China's Second West-East pipeline. During this process, big efforts were made to further develop and enrich the application of microalloymg technology, and at the same time the strengthening effects of Nb have been completely unfolded and fully utilized with improved metallurgical quality and quantitative analysis of microstructure. In this paper, the existing status and strengthening effect of Nb dunng reheating, rolling, cooling and welding have been analyzed and characterized based on mass production samples and laboratory analysis. As confirmed, gram refinement remams the most basic strengthening measure to reduce the microstructure gradient along the thickness, which in turn enlarges the processing window to improve upon low temperature toughness, and finally make it possible to develop heavy gauge, high strength pipeline steels with more challenging fracture toughness requirements. As stated by a good saymg that practice makes perfect. Based on application practice and theoretical analysis, HTP has been extended to develop heavy gauge, large diameter and high strength pipeline steels with increasing requirements, including Φ 1219 ×22.0mm X80 spiral welded pipe, Φ 1422 × 32.0mm X80 longitudinal welded pipe, heavy gauge X80 LSAW pipe with low temperature requirements, as well as X90 steels and X80 grade for sour service environment. In this paper, alloy design, production processmg, as well as mechamcal properties and microstructure used for these products would be illustrated. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).


Zhang Y.,CITIC Metal Co. | Aimin G.,CITIC Metal Co. | Jansto S.G.,CBMM North America Inc. | Quanli W.,Shougang Institute of Technology
7th International Conference on High Strength Low Alloy Steels, HSLA Steels 2015, International Conference on Microalloying 2015, Microalloying 2015 and International Conference on Offshore Engineering Steels 2015, OES 2015 | Year: 2015

It is well known that the strengthening mechanisms of Nb Microalloying on low carbon flat products have been widely studied and recognized since Microalloying 75 in Washington, DC, but the application research of Nb Microalloying on higher carbon long products in excess of 0.020% carbon has been incomplete and full of debate for a long time due to limited solubility of Nb(CN) in austenite, dominant application of V Microalloying in long products, as well as uncertainty about the effects of Nb. In this paper, some new phenomena have been presented and clarified based on the application cases of Nb Microalloying in long products, including high strength rebars microalloyed with small amount Nb and high-carbon wire rod microalloyed with Nb addition up to 0.02% used for prestressed steel strand. Contrary to the traditional opinions, Nb-bearing rebars manifest higher tensile-to-yield ratio compared with V-bearing rebars, especially for high strength rebars of HRB500 and HRB600, which would be discussed based on production processing of rebar products. In addition, Nb Microalloying for high carbon wire rod used for perstressed steel strand also demonstrates encouraging application prospect by reducing net carbide of entectoid steel with carbon content up to 0.087%, as shown from test results of Nb-bearing 87B product. As for these abnormal phenomena, industrial production and subsequent microstructure analysis have been carried out to further validate and clarify the strengthening mechanisms of Nb Microalloying, which will facilitate the understanding of Nb Microalloying technology.


Bian J.,Niobium Technology Asia | Mohrbacher H.,NiobelCon BVBA | Zhang J.-S.,Control Iron and Steel Research Institute, China | Zhao Y.-T.,Shougang Institute of Technology | And 2 more authors.
Advances in Manufacturing | Year: 2015

The fast-growing economy and the gradually established highway system have boosted the road transportation for both passenger and cargo over the last decade in China. From 2000 to 2010 Chinese GDP increased by around 10.15% annually and the sales of medium and heavy trucks by around 18.87% (sales increased from 0.2 million in 2000 to 1.3 million in 2010) according to the National Bureau of Statistics of People’s Republic of China. Today commercial vehicles consume almost the same amount of fuel as passenger cars in China although the number of commercial vehicles is only about one fourth of passenger cars. It is estimated that around 50% of imported fuel to China each year will be consumed by vehicle transportation. This situation will worsen fuel shortage problems in the long run and at the same time it is partially responsible for the ever-worsening air pollution in China. Due to the widespread overloading in China, lightweight development in commercial vehicles has fallen far behind that of passenger cars with the consequences that Chinese commercial vehicles consume in average about 20% more fuel, especially the heavy trucks, compared to European models. Under these circumstances it is essential to reduce the vehicle fuel consumption and increase the transport efficiency. The key solution thereby is to implement lightweight design in commercial vehicles as it has been successfully practiced over the last decade in the passenger cars. This paper summarizes highlights given in presentations during the “International seminar on the application of high strength steels in light weight commercial vehicles” with the focus on the development and application of Nb alloyed high performance steels made for lightweight commercial vehicles. © 2015, The Author(s).


Yu H.,University of Science and Technology Beijing | Zhou H.,University of Science and Technology Beijing | Wang H.,CITIC Metal Company Ltd | Mao X.,University of Science and Technology Beijing | Li X.,University of Science and Technology Beijing
7th International Conference on High Strength Low Alloy Steels, HSLA Steels 2015, International Conference on Microalloying 2015, Microalloying 2015 and International Conference on Offshore Engineering Steels 2015, OES 2015 | Year: 2015

Strengthen-mechanism and corrosion resistance of niobium addition high strength low alloy weathering H-beams produced by ultra-fast cooling technology, had been investigated in this research. The results show that the microstructure of the ultra-fast cooling weathering H-beams sample was consisted of polygonal ferrite and pearlite as well as fine, dispersive and uniform Nb(C,N) precipitates. Niobium element plays its role of grain refinement and precipitation strengthening by refining ferrite grains and obtaining (Nb,Ti)(C,N) precipitation, which significantly improved the strength and toughness. Furthermore, the corrosion resistance performance of weathering H-beams was also studied by simulated atmosphere-salt spray test. It was found that the corrosion rate and thickness reduction of the weathering H-beams with homogeneous rust layer were lower than that of conventional carbon steel Q345. The results also revealed that the corrosion process can be divided into initial stage in which corrosion rate increased with accumulation of corrosion products and the second stage in which homogenous, adherent and compact rust layer started to protect the steel substrate out of corrosion solution.


Liu Z.,CITIC Metal Co. | Guo A.,CITIC Metal Co.
Energy Materials 2014, Conference Proceedings | Year: 2014

The present paper provides a brief introduction to the development history and current grades of steel plate for pressure vessels in China. Niobium microalloy technology for pressure vessel steel plates, which could refine the as-rolled microstructure, inhibit the grain growth during heating and soaking, improve creep resistance by stable precipitates at elevated temperature, strength steel due to fine precipitates after tempering, increase hardenability, improve steel toughness and weldability, has been discussed. The research and application of Niobium in C-Mn steels, low temperature steels, Cr-Mo steels, as well as high strength steels for pressure vessels in China have been introduced in detail.


Li H.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Yang C.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Wei Z.,CITIC Metal Co. | Chen X.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zhai Q.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing
TMS Annual Meeting | Year: 2015

The Nb-rich phase generated by the addition of trace amounts of Nb(<0.1wt%) \ and the effects of different content of Nb on the morphology and distribution of graphite in ductile iron were studied in this paper. The results showed that when the content of niobium less than 0.1 wt%, the two-dimensional morphology of Nb-rich phase existed in microalloyed ductile iron were mainly regular pattern such as square, triangle, polygon etc. Besides, Nb-rich phase in large size distributed in the matrix with a certain distance from graphite. With the increasing amount of niobium, the dispersion degree of graphite diameter, average diameter and roundness increased slightly, and the number of graphite decreased slightly. Copyright © 2015 by The Minerals, Metals & Materials Society. All rights reserved.


Yang C.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zhang W.,CITIC Metal Co. | Li H.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Chen X.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zhai Q.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing
TMS Annual Meeting | Year: 2015

In this paper, ductile iron material with different content of niobium was prepared by a scientific melting method. Image Analysis Software was used to studied the effect of niobium microalloying on both pearlite content and pearlite lamellar spacing in ductile iron quantitatively. The results showed that the addition of a small amount of niobium could increase the pearlite content and decrease pearlite lamellar spacing of ductile iron effectively. Copyright © 2015 by The Minerals, Metals & Materials Society. All rights reserved.

Loading CITIC Metal Co. collaborators
Loading CITIC Metal Co. collaborators