This paper mainly introduces that the quality and productivity of the stainless steel elbow have been greatly improved by using the axial cold pressing process instead of the radial cold pressing process. This technology has high practicability in the production of stainless steel pipe fittings ...

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Long-period operation is the most prominent feature of large ammonia synthesis plant. However, the high-pressure steam drum feedwater check valve is very easy to leak during long-term operation, which seriously affects the long-term operation of the plant. In case of abnormal leakage, if no quick a ...

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As the scale of oil refining and chemical plants has become larger in recent years, the pressure and diameter of pipelines have become larger and larger, and the selection and calculation of blind flanges for pressure testing has become a difficult part of the process. This paper focuses on the for ...

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Overview Ring forging refinement process is an advanced production process to refine ring parts by ring rolling. The so-called ring rolling, also known as ring rolling or reaming, it is the ring rolling equipment one by one ring rolling machine (also known as rolling machine or reaming machine ...

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The mixed solution of nitric acid and potassium dichromate was used to passivate 304 stainless steel plate. It is found that the passivation process of stainless steel surface is accompanied by the formation and dissolution of passivation film. Compared with 304 stainless steel plate, the mass ...

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Taking the flange as the research object, the structure and process of the flange are analyzed, and the deformation degree is checked. The process plan of upsetting and extruding the flange and step first, and then forming the center hole step by step is drawn up. The forming process of flange ...

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Eddy current inspection and eddy current thickness measurement of copper nickel alloy heat exchanger tubes using dual frequency eddy current and dual probe inspection techniques are introduced. For the eddy current testing of such nickel alloy materials with weak magnetism, a reasonable testing ...

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High pressure heater is an important equipment for auxiliary equipment of power plant, with large volume, complex structure, high design temperature and pressure, and medium of high temperature and high pressure steam and water. This paper introduces the deep hole processing technology of super ...

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Changing 316L austenitic stainless steel by heat treatment σ and δ volume fraction of phase can optimize the mechanical and corrosion properties of 316L austenitic stainless steel manufactured by gas metal arc additive (GMAAM). The results show that heat treatment at 1000-1200 ͍ ...

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In view of the shortcomings of the traditional forging process for high neck flange parts with large holes in the middle of widely used austenitic stainless steel, a new process of directly upsetting and extruding flanges with tube blanks is proposed; The upsetting extrusion process of austenitic s ...

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This paper briefly describes the principle of the medium frequency bending machine and the medium frequency hot bending process of stainless steel pipes, and uses the medium frequency hot bending machine to carry out the stainless steel bending test and forming quality inspection. Based on the test ...

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In this paper, the hot forming process of stainless steel flange in shore connection pipe of product oil tanker is summarized. The forging process of stainless steel flange is introduced from the aspects of material heating control, die design, forging forming and post forging heat treatment. In th ...

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