Jiangsu Huayang Metal Pipes Co.

Zhenjiang, China

Jiangsu Huayang Metal Pipes Co.

Zhenjiang, China
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Zhang X.,CAS Shenyang Institute of Metal Research | Xu Y.,CAS Shenyang Institute of Metal Research | Xu Y.,Nanjing University of Science and Technology | Xu Y.,Jiangsu Huayang Metal Pipes Co. | And 5 more authors.
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2017

AISI 304 austenite stainless steel was applied extensively in the modern industry due to its good properties on mechanics and corrosion resistance. However, there is severe intergranular corrosion when the AISI 304 was working at the temperature 420~850℃ called sensitizing temperature. This phenomenon was more obvious with increase of strain. In addition, this effect can not be removed completely even with the heat treatment subsequently. In present work, the influence of solution treatment and plastic deformation on the intergranular corrosion property of AISI 304 was investigated. The specimens subjected to different strain were obtained by the uniaxial tensile tests at room temperature. XRD was used to measure the fraction of martensitic phase which was induced by deformation. Optical metal- lographic microscope was applied to observe the evolution of microstructure. The influence of various deformation values, solution temperature and holding time on intergranular corrosion was quantitative analyzed by electrochemical potentiodynamic reactivation (EPR) method. Experimental results showed that the degree of the intergranular corrosion increased with the increase of deformation, and with the decrease of solution temperature and holding time. It is indicated that since the solubility of carbon in martensite and austenite is discrepant, the content of carbon in the grains recrystallized is discrepant too. The more martensite is transformed, the more chromium carbide is formed in the grain boundary after sensitization. This phenomenon causes poor intergranular corrosion resistance due to the lack of chromium. In addition, the carbon segregation which is caused by plastic deformation will relieve with the rise of solution temperature and holding time. It is because that the carbon atom is more active at higher temperature, and the distribution of carbon is more homogeneous with the extended holding time. Then the quantity of chromium carbide will decrease in solution treatment process. Consequently the chromium depletion will be mitigated. From the above, a uniform solution treatment condition is not suitable for austenite stainless steel with the effect of martensitic transformation in cold working. Flexible scheme can be employed to insure better combination property of products. © All right reserved.


Guo X.-Z.,Nanjing University of Aeronautics and Astronautics | Tao J.,Nanjing University of Aeronautics and Astronautics | Liu H.-B.,Nanjing University of Aeronautics and Astronautics | Li M.,Jiangsu Huayang Metal Pipes Co.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2010

The integral hydroforming process to prepare CLAM T-shapes for fusion applications was evaluated by means of numerical simulation. The paper firstly investigated the effect of different paths on the protrusion height and distribution of thickness thinning rate of T-shapes. Then, it discussed that the friction coefficient between die and tube blank played an important role in manufacturing high quality T-shapes. Subsequently, the practical hydroforming was performed based on the simulation results with the aid of special lubrication coatings with friction coefficient 0.07. It is obviously indicated that the simulation results agree well with the experimental ones in geometry size and wall thickness distribution. The results indicate that the numerical simulation guides the practical hydroforming of CLAM tube effectively and determines the actual cold forming process parameters rapidly. The sound CLAM T-shapes with proper geometry size and thickness distribution can be obtained by the optimal hydroforming process.


Guo X.,Nanjing University of Aeronautics and Astronautics | Tao J.,Nanjing University of Aeronautics and Astronautics | Li M.,Jiangsu Huayang Metal Pipes Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

The effects of die surface and punch on the forming quality of T-shapes by hydroforming were investigated by means of the numerical simulation. The forming effects of different loading paths in the process were investigated. Subsequently, a practical hydroforming was performed based on the simulation results with the aid of special lubrication coatings. It is obviously indicated that the simulation results agree well with the experimental ones in protrusion height and wall thickness distribution. The results show that the better die face and the punch can improve the quality of T-shapes effectively.


Guo X.-Z.,Nanjing University of Aeronautics and Astronautics | Tao J.,Nanjing University of Aeronautics and Astronautics | Tang Q.-S.,Jiangsu Huayang Metal Pipes Co. | Li H.-G.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

To explore the plastic forming characteristics of TA1-Al bimetallic elbow, the critical bonding strength of the interface for the clad tube in the push-bending process was determined firstly by numerical simulation. Secondly, the effects of axial push velocity and friction coefficient on the maximum value of shear stress and the thickness distribution of the clad elbow were investigated. The simulation results show that the critical interface bond strength needed in the push-bending process is 50 MPa. Furthermore, the push velocity and the friction coefficient should be less than 10 mm/s and 0.125 for producing TA1-Al clad elbows without separation at the interface. The experimental results are approximately accordant with the simulative ones in the geometry size and thickness distribution.


Zhang L.-W.,Nanjing University of Aeronautics and Astronautics | Tao J.,Nanjing University of Aeronautics and Astronautics | Guo X.-Z.,Nanjing University of Aeronautics and Astronautics | Li M.,Jiangsu Huayang Metal Pipes Co. | Sun X.-J.,Nanjing University of Aeronautics and Astronautics
Jinshu Rechuli/Heat Treatment of Metals | Year: 2010

Multi hydroforming process was adopted in preparing Ti/Al bimetallic tee pipe fitting. The effect of inner pressure on the forming performance was studied, and a internal pressure formula was created for bimetallic tee pipe fitting hydroforming. The experimental tests prove that the formula have a good guide action on practise hydroforming of bimetallic tee pipe fitting. Furthermore, the heat treatment process of explosive welded Ti/Al bimetallic pipe and tee pipe fitting were investigated, and the corresponding heat treatment process was put forward. Finally, the height of branch pipe, thickness distribution, and interfacial bonding of Ti/Al bimetallic tee pipe fitting were inspected. The results show that a highly qualified Ti/Al bimetallic tee pipe fitting with uniform thickness profile in both inside and outside layer and a qualified branch were obtained through three-step hydroforming process.


Guo X.,Nanjing University of Aeronautics and Astronautics | Tao J.,Nanjing University of Aeronautics and Astronautics | Wang T.,Nanjing University of Aeronautics and Astronautics | Tang Q.,Jiangsu Huayang Metal Pipes Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2011

A new combined process of preparing the Al2O3 coatings on the inner surface of TA1 pipe-fittings with complicated shape was developed to improve the resistance of scouring abrasion and corrosion of substrate. The new process mainly included explosive welding, plastic forming and micro-arc oxidation. The phase composition and topography of Al2O3 coatings were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), respectively. Bonding strength, corrosion resistance and anti scouring property of the coatings were also measured. The results indicate that the coatings are composed of γ-Al2O3 and α-Al2O3 with the thickness of 40 μm and 10 μm, respectively. The bonding strength can reach 55N between the prepared Al2O3 coatings and TA1 substrate. The corrosion current of coatings is 5 orders of magnitude lower than that of TA1 substrate. In addition, the Al2O3 coatings can protect substrate from scouring abrasion effectively.

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