Shougang Technical Research Institute

Beijing, China

Shougang Technical Research Institute

Beijing, China
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Fu X.-Q.,Beihang University | Wu S.-J.,Beihang University | Wu S.-J.,Shougang Technical Research Institute | Li Z.-P.,Beihang University | Li J.-D.,Shougang Technical Research Institute
Jinshu Rechuli/Heat Treatment of Metals | Year: 2010

Continuous cooling transformation ( CCT) behaviors of X80 and XI00 low-carbon microalloyed pipeline steels were investigated under the undeformed and deformed conditions, respectively. The corresponding CCT diagrams were constructed by using a Gleeble-2000 thermomechanical simulator,and microstructure of the steels at different cooling rates and deformation conditions was observed by OM,SEM and TEM. The results show that polygonal ferrite and pearlite can be formed at low cooling rates, massive ferrite, granular ferrite, acicular ferrite and bainitic ferrite can be obtained with increase of the cooling rate. Furthermore, hot deformation can strongly promote the formation of acicular ferrite,that is,the transformation temperature of acicular ferrite is increased by 50-100 °C ,this leads to CCT curves move towards the top left corner, which results in grain refining and more random orientation.


Chang K.,Shougang Technical Research Institute | Chen T.,Shougang Technical Research Institute | Wang P.,Shougang Technical Research Institute | Ju X.,Shougang Technical Research Institute | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

The torque fatigue limit curve of YF40MnV non-quenched and tempered steel was tested, the reason of fatigue failure was analyzed. The results show that the torque fatigue limit of the rolled non-quenched and tempered steel YF40MnV is 264 MPa, the endurance ratio τ-1/σb=0.3, which exceeds that of quenched tempered steel 40Cr.


Xie C.,Shougang Technical Research Institute | Han Y.,Shougang Technical Research Institute | Liu H.,Shougang Technical Research Institute | Kuang S.,Shougang Technical Research Institute | Teng H.,Shougang Technical Research Institute
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

Effect of annealing temperature on microstructure and mechanical properties of hot-dip galvanized 550 MPa low alloy steel were studied. The results show that after continuous annealing, the matrix of the steel is ferrite with a few Fe3C at grain boundaries, and a lot of precipitates appear in the ferrite. Under different annealing temperatures, the grain size of ferrite has a little change, but the number of precipitates decrease with annealing temperature increasing, and meanuhile yield strength and tensile strength decrease, while elongation increases. © 2016, Editorial Office of "Jinshu Rechuli". All right reserved.


Ding R.,University of Science and Technology Beijing | Tang D.,University of Science and Technology Beijing | Chen Y.-L.,University of Science and Technology Beijing | Zhao A.-M.,University of Science and Technology Beijing | And 2 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

Special TRIP steel with annealed martensite matrix (TAM steel) was produced by fully quenching and annealing in the two-phase region with the C-Si-Mn chemical composition of common TRIP steel. The microstructure and mechanical properties of TAM steel annealed at different temperatures were investigated by thermal dilatometry, tensile testing, optical microscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. It is found that the microstructure of TAM steel consists of a uniform fine annealed martensite matrix and an interlath second phase of retained austenite and bainite/martensite, which contribute to lowering the matrix's hardness and the strength ratio of matrix to second phase as well as decreasing the dislocation density. As the annealing temperature rises, the mixed blocky microstructure of newly formed martensite/bainite gradually increases, while the lath-like morphology of annealed martensite progressively disappears. Excellent mechanical properties are obtained when the annealing temperature is 780℃, with the tensile strength, the elongation, and the product of strength and ductility up to 1130 MPa, 20%, and 22600 MPa·%, respectively. When the annealing temperature is relatively low, retained austenite mainly exists between annealed martensite laths in film-form and is conducive to the occurrence of TRIP effect. ©, 2014, University of Science and Technology Beijing. All right reserved.


Zou Y.,Shougang Technical Research Institute | Gu L.,Shougang Technical Research Institute | Liu C.,Shougang Technical Research Institute | Zhang S.,Shougang Technical Research Institute
Proceedings of the 10th International Conference on Steel Rolling | Year: 2010

In recent years, the iron and steel industry is subjected to the challenges of resources, energy and environment. On the premise of maintaining and even improving products performance, it has become an important issue to reduce costs for survival and development of the iron and steel enterprises. At present, the tensile strength of 700 MPa level high-strength structural steel plate commonly adopts ultra-low carbon bainitic steel(ULCB) composition design system, using Cr-Mo-Ni-Cu as main alloying elements. In this work, ditlerent component system of the Continuous Cooling Transformation(CCT) curve is measured, the influence of the elements and cooling rate on the mierostructure and mechanical properties is studied. Based on the CCT curve, the basic Bainite composition design is changed, using Mn-B as the major element of Bainite formation to replace the traditional Cr-Mo-Cu-Mi Bainite component system, as well as Nb, V is used as microalloying elements. Under the premise of ensuring the product quality, using Mn-B as the basic Bainite composition significandy reduces the production costs and improves the steel plate welding performance by cutting down the carbon equivalent(CET). This study indicates that the ULCB composition system, which using Mn-B as the primary form elements and Nb, V as microalloying elements, is suitable to produce the plate (lower than 60 mm) with the tensile strength of 700 MPa level in low cost.


Yuan P.,University of Science and Technology Beijing | Bao Y.-P.,University of Science and Technology Beijing | Cui H.,University of Science and Technology Beijing | Zhang Y.-H.,Qiangang Corporation of Shougang Group | And 2 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2011

To solve the problems such as relatively big dead zones, insufficient flotation of inclusions and high casting remnant in tundishes when producing high quality interstitial-free (IF) steel, a series of optimizing measures were practiced in water modeling experiments. The results show that the fluid flow manifests an obvious up-ward trend using the high dam with two upward holes, the minimum residence time increases by 12.5%, and the dead zone decreases by 36%. In the end of casting, liquid steel can flow out through the holes avoiding a large amount of steel between the dames, the theoretical casting remnant declines from 9 to 4.5 t, and the metal yield increases obviously.


Chang K.-D.,Shougang Technical Research Institute | Wang P.,Shougang Technical Research Institute | Liu W.-P.,Shougang Technical Research Institute
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

Non-quenched tempered steel with energy-saving, low-cost, excellent property and eco-friendly gains more and more application. The development status and prospect of non-quenched tempered steels were reviewed. The classifications, chemical composition, manufacturing processes, mechanical properties and principal application of non-quenched tempered steels were summarized. The approach to improving of strength and toughness and development current in the future for non-quenched tempered steel were disscussed.


Wang X.,University of Science and Technology Beijing | Li X.,University of Science and Technology Beijing | Li Q.,University of Science and Technology Beijing | Huang F.,University of Science and Technology Beijing | And 2 more authors.
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2013

The string shaped B type non-metallic inclusions in API (American Petroleum Institute) X80 pipeline steel plates, produced by the BOF-LF-RH-Ca treatment steelmaking route, were mainly of CaO-Al2O3 system with lower melting temperatures. The formation reasons are as follows: (1) there existed many small sized liquid inclusions of CaO-Al2O3 system in liquid steel after the secondary refining and Ca treatment. These small inclusions could aggregate to larger ones of 10-20 μm in continuous casting and be deformed into string shaped inclusions in steel plates during rolling. (2) for the larger sized and low melting temperature CaO-Al2O3 inclusions, in Ca treatment, their surface layers could be modified into high melting temperature CaO, CaS or CaO-CaS system, but the centers remained to be CaO-Al2O3 system. During rolling, these inclusions could also be elongated to string typed ones because of their soft CaO-Al2O3 centers. A new strategy for control of B typeinclusions in X80 pipeline steel plates was adopted. The key of the control was shifted from removing low melting temperature inclusions of CaO-Al2O3 system after Ca treatment to remove as much as possible inclusions especially large sized inclusions before the Ca treatment. With the new strategy, the amount of inclusions after RH refining was remarkably decreased and the efficiency of Ca treatment significantly improved. The non-metallic inclusions found in steel plates were all of high melting temperature CaO-CaS system and the severity of B type inclusions has been lowered from >2.0 to 0.

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