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Ding W.,WISDRI Engineering and Research Incorporation Ltd Company
Advanced Materials Research | Year: 2012

Given that the traditional hot temper passing process cannot fulfill the demand of high strength steel on residual stress level and stable processability, leveler and temper passing process with dual servo valve (LTP-DSV) is developed to solve this technical problem. LTP-DSV process employs leveler to reduce residual stress level of high strength steel; uses dual servo valve variable gain rolling force control technology to improve performance stability of high strength steel; improves surface quality of high strength steel by means of temper passing. The residual stress level of products is substantially reduced on condition that the performance of high strength steel is ensured. The actual production data shows LTP-DS process is able to improve the performance and quality of high strength steel from all aspects. © (2012) Trans Tech Publications, Switzerland.


Liu G.,Shanxi University | Li H.,WISDRI Engineering and Research Incorporation Ltd Company | Feng X.,China University of Petroleum - Beijing | Deng C.,China University of Petroleum - Beijing | Chu K.H.,Shanxi University
Chemical Engineering Science | Year: 2013

For a hydrogen network with purification, it is postulated that different Purification Feed Flow Rates (PFFRs) will exert different effects on the hydrogen utility consumption. To optimize a hydrogen network with purification reuse, the effect of the PFFR on the hydrogen utility consumption should thus be analyzed systematically. However, no in-depth studies on this subject matter are available in the open literature. This work aims to bridge this research gap by establishing the relationship between the PFFR and the hydrogen utility consumption. According to the concepts of hydrogen surplus and pinch point, the characteristic of the pinch point is analyzed first, and it is found that the pinch point can only appear at the sink-tie-line which can intersect the source purity profile. Then, the quantitative relationship between the hydrogen utility adjustment and the hydrogen surplus is deduced, and a numerical method for identifying the pinch point and the minimum hydrogen utility consumption target is developed. Based on this, the quantitative relationship between the PFFR and the hydrogen surplus at each sink-tie-line is deduced. The upper bound of the PFFR can be identified from the hydrogen surplus variation diagram. The proposed numerical approach for targeting the hydrogen pinch problems and a systematic graphic method for identifying the limiting PFFR have the merit of being conceptually simple and easy to apply. Two cases are studied to illustrate the applicability of the proposed method. © 2012 Elsevier Ltd.


Hu J.,Northeastern University China | Du L.-X.,Northeastern University China | Wang J.-J.,Northeastern University China | Sun Q.-Y.,WISDRI Engineering and Research Incorporation Ltd Company
Materials and Design | Year: 2014

For the purpose of developing Nb-V-Ti microalloyed, hot rolled, high strength automotive steel for usage in heavy-duty truck wheel-discs and wheel-rims, appropriate cooling processes were designed, and microstructures and comprehensive mechanical properties (tension, bending, hole-expansion, and Charpy impact) of the tested steels at two cooling schedules were studied. The results indicate that the steel consists of 90% 5. μm polygonal ferrite and 10% pearlite when subjected to a cooling rate of 13. °C/s and a coiling temperature of 650. °C. The yield strength, tensile strength, and hole-expansion ratio are 570. MPa, 615. MPa, and 95%, respectively, which meet the requirements of the wheel-disc application. The steel consists of 20% 3. μm polygonal ferrite and 80% bainite (granular bainite and a small amount of acicular ferrite) when subjected to a cooling rate of 30. °C/s and a coiling temperature of 430. °C. The yield strength, tensile strength, and hole-expansion ratio are 600. MPa, 655. MPa, and 66%, respectively, which meet the requirements of the wheel-rim application. Both the ferrite-pearlite steel and ferrite-bainite steel possess excellent bendability and Charpy impact property. The precipitation behavior and dislocation pattern are characterized and discussed. © 2013 Elsevier Ltd.


Ding W.,WISDRI Engineering and Research Incorporation Ltd Company
Advanced Materials Research | Year: 2012

In order to enhancing strip flatness in temper mill, in this paper, stress state, micro structure characteristics of contact surface, energy characteristics, dislocation intensity were analyzed. Plastic deformation characteristics of metal during tempering process have been come to a conclusion. Two mechanisms, friction mechanism and elongation rate mechanism, are proposed for enhancing strip flatness during tempering process. On the basis of these mechanisms, strip flatness control strategies suitable for tempering of ordinary cold rolled products, cold rolled deep-draw products, hot rolled products and hot rolled high strength steel products are discussed, and proper equipment configuration is proposed.


Mu X.-F.,WISDRI Engineering and Research Incorporation Ltd Company
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

Aiming at the deficiency of the local strength verification in the traditional design, the optimizing design of the lifting-hand is analyzed based on first-order optimizing arithmetic. At the same time, the analysis of the overall structure deformation of the full-hung tundish car is carried out by use of the finite element method. The results show that the overall strength of the lifting-hand and main frame meets the design requirements. Larger multiply stress of the lifting-hand exits in the leading arc part on the steel plate supported the tundish and the bottom of the steel plate supported the guide pulley. On the other hand, larger multiply stress of the main frame occurs in the leading arc parts which are used to connect the main frame with the driving wheels. Therefore, local strength of these positions should be adapted to strengthen during the course of the practical design.

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