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Influence of Heat Treatment on Hydroformability of TRIP seamless Steel tube

Journal of Iron and Steel Research International 2014年第7期21卷 695-701页

作者： Zi-cheng ZHANG Ken-ichi MANABE School of Mechanical Engineering and Automation Northeastern University Department of Mechanical Engineering Tokyo Metropolitan University

A low-carbon TRIP seamless steel tube, which is expected to be used in the hydroforming process, was successfully fabricated using piercing, cold-drawing and two-stage heat treatment process. The two-stage heat treatment is one crucial step because it significantly affects the microstructure and mechanical properties of TRIP seam less steel tube. In order to obtain the TRIP seamless steel tube with high hydroformability, several different heat treatment processes were conducted. The effects of heat treatment conditions （intercritical annealing （IA） and isothermal bainite treatment （IBT）） on the TRIP seamless steel tube hydroformability which was determined by free hydraulic bulge test were analyzed. Two different internal pressure boosting velocities of 0.2 and 0.5 MPa/s of free hydraulic bulge tests were adopted to determine the effective stress vs. effective strain curve of TRIP seamless steel tube. The results showed that for the predetermined IA condition, the maximum bulge height increased, but the maximum burst internal pressure decreased, with the increase of IBT holding time from 4 to 6 rain. For the predetermined IBT condition, the maximum bulge height decreased, but the maximum burst internal pressure increased, with the increase of IA holding time from 5 to 10 rain. By analyzing the free hydraulic bulge test results, it was found that the maximum bulge heights of TRIP seamless steel tubes with the internal pressure boosting velocity of 0.5 MPa/s were higher than those when the internal pressure boosting velocity was 0.2 MPa/s. This means that an appropriate deformation rate should be chosen to obtain the optimal hydroformability of TRIP seamless steel tube. In addition, the effective stress vs. effective strain curves of TRIP seamless steel tubes were ohtained with free hydraulic bulge test.

关键词： TRIP steel heat treatment hydroformability seamless tube hydraulic bulge test

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Chemistry and Process Optimization of V-Microalloyed N80-Class seamless Casing tube

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Journal of Iron and Steel Research International 2010年第3期17卷 72-78页

作者： PAN Tao YANG Cai-fu MA Yue XUE Dong-mei ZHANG Yong-quan Division for Structural Materials Central Iron and Steel Research Institute Beijing 100081 China

The complex effects of different nitrogen （N） contents and thermal routines on the microstructure and mechanical properties of 33Mn2V steels for N80-Class seamless casing tube application were investigated using Gleeble simulation technique. The results showed that the N additions of 0. 014 %- 0. 021 % in the steels for the in-line normalization process （ILNP） increased the strength while the toughngss remained at a high level as compared with the steel with N content of 0. 005 %. It was also revealed that the N addition of 0. 021%could enhance the performance combination of strength and toughness in the steels by using 700 ℃ as the cooling interrupted temperature （CIT） for the non in-line normalizing process （NILNP）. It was further evidenced that the toughness was improved at expense of strength to some degree in all the steels by decreasing reheating temperature for the ILNP, while an increase of CIT for NILNP severely impaired the toughness and slightly improve the strength in the high-N steel with N content of 0. 021%. This can be attributed to the dissolution and precipitation behavior of V（C,N）. The optimization of V （C,N） precipitation could be achieved by enhancing N. The precipitation of V（C, N） in austenite was promoted by cooling to a certain temperature lower than the A,1 for the ILNP. The V（C,N） particles formed in austenite contrib- uted to grain refinement by the VN-induced nucleation of intragranular ferrite, but as a result the effect of precipitation on strengthening would become weaker due to a decrease of the precipitation of V in ferrite.

关键词： seamless tube in-line normalizing V-N microalloying reheating mechanical properties Gleeble simulation

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Method for Improving Transverse Wall Thickness Precision of seamless Steel tube Based on tube Rotation

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Journal of Iron and Steel Research International 2015年第10期22卷 924-930页

作者： Yong-zheng JIANG Hua-ping TANG State Key Laboratory of High Performance Complex Manufacturing Central South University

The tube rotation method （TRM） refers to the rotational movement of steel tube about its axis as well as translation in rolling direction in stretch reducing rolling process. The influence of the TRM on transverse wall thickness precision of seamless steel tube was studied. Thickness distribution of the TRM was obtained by superimposing the thickened amount of single pass rolling. Results show that the TRM can effectively improve the evenness of thickness distribution. In order to analyze the influence mechanism of the TRM, the finite element method was adopted to simulate the thickness distribution in stretch reduction process. Results show that the TRM changes the roundtrip flow between two fix places of conventional stretch reducing and inhibits the directional accumulation of metal. In addition, the TRM has a correction effect on thickness cusp. All these advantages of the TRM help to improve the transverse wall thickness precision of seamless steel tube.

关键词： seamless tube stretch reducing transverse unevenness tube rotation method

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Numerical Simulation of seamless tube’s Stretch Reducing Process

Numerical Simulation of Seamless Tube’s Stretch Reducing Pr...

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第六届材料与热加工物理模拟及数值模拟国际会议

作者： LI Jun-hong 1 YU Hui 1 GUO Hua 1(1.Pangang Group Research Institute Co.Ltd Chengdu 611731 Sichuan China)

The stretch reducing process is the last hot deformation process of the hot-rolled seamless steel tube’s *** role is to decrease the tube’s diameter under the large tension and expand the range of product *** the stretch reducing process often results in wall thickness tolerance at the head and end of the *** order to solve the problem,a 3D elastic-plastic finite element analysis model was established to simulate the stretch reducing process of Φ159 *** on this,the tube’s wall thickness distribution was studied and the parameters of sharpen rolling process was put *** simulation results indicate that with the parameters of sharpen rolling process,the length of wall thickness tolerance was shorten and the rate of finished products was proved.

关键词： seamless tube stretch reducing numerical simulation

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FE SIMULATION OF CENTER CRACK OCCURRENCE IN tube ROUNDS DURING TWO-ROLL ROTARY ROLLING PROCESS

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Acta Metallurgica Sinica(English Letters) 2007年第3期20卷 225-234页

作者： S.Z. Li J. Xu Y.D. Yin J.G. Xue F. Pan J.M. Zheng J.H. Yoon Department of Materials Forming and Control Engineering Anhui University of Technology Ma＇anshan 243002 China Provincial Key Laboratory of Metals and Processing Ma＇anshan 243002 China Steel tube ＆ Pipe Company of Bao Steel Co. Ltd. Shanghai 200941 China Department of Metallurgy and Materials Science Changwon National University Changwon 641-773 Korea

With the aid of FE （finite element） code *** 2005, 2-D coupled thermo-mechanical simulation of center-crack occurrence in round billet during 2-roll rotary rolling process was presented using Oyane ductile fracture criteria. A simple modeling is put forward based on the spiral motion of the workpiece as an essential characteristic in movement. The influence of the feed angle and the entry cone angle of the main roll on the process was taken into account in the modeling. The soundness for simplifying the 3-D rotary rolling into a 2-D problem was discussed. By adopting the parameters of Diescher piercer in 140mm mandrel mill of Bao Steel, the distribution and development of strain/stress were analyzed, and the eigen value of ductile fracture as well. The critical percentage of diameter reduction was obtained from the simulation. The result showed a good agreement with the experimental value, and therefore was of widely guiding significance to the practical process for rationally formulating the deformation parameters of steel tube piercing.

关键词： numerical simulation inside crack, tube piercing rotary rolling seamless tube deformation

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Modeling and Optimization for Piercing Energy Consumption

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Journal of Iron and Steel Research International 2009年第2期16卷 40-44页

作者： XIAO Dong PAN Xiao-li YUAN Yong MAO Zhi-zhong WANG Fu-li Key Laboratory of Process Industry Automation of Ministry of Education and Liaoning Province NortheasternUniversity Shenyang 110004 Liaoning China BaoSteel Corporation Shanghai 201900 China

Energy consumption is an important quality index in the production of seamless tubes. The complex factors affecting energy consumption make it difficult to build its mechanism model, and optimization is also very difficult, if not impossible. The piercing process was divided into three parts based on the production process, and an energy consumption prediction model was proposed based on the step mean value staged multiway partial least square meth- od. On the basis of the batch process prediction model, a genetic algorithm was adopted to calculate the optimum mean value of each process parameter and the minimum piercing energy consumption. Simulation proves that the op- timization method based on the energy consumption prediction model can obtain the optimum process parameters effectively and also provide reliable evidences for practical production.

关键词： seamless tube piercing energy consumption mean value staged multiway partial least square method genetic algorithm

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