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Effect of external potential on stress corrosion behavior of 316L stainless st……

316L austenitic stainless steel is a kind of ultra-low carbon stainless steel with carbon content less than 0.03%. Its material properties are equivalent to 00Cr17Ni14Mo2 steel in China [1,2]. 316L stainless steel, as the main material of PWR primary pipe and core components [3], has excellent mechanical properties and corrosion resistance, and is widely used in nuclear power field. 316L stainless steel flange is prone to stress corrosion cracking under the condition of stress and corrosive medium at the same time. This kind of corrosion is mainly caused by the destruction of the passivation film on the surface of 316L […]

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Analysis on the perforation of eccentric reducer behind the outlet valve of 1 ……

In recent years, with the increase of sulfur-containing crude oil import and the deterioration of crude oil quality, the corrosion problem of atmospheric and vacuum distillation unit, as the first process of crude oil processing, has become increasingly serious. Corrosion not only shortens the service life of the equipment and causes huge waste of energy, but also leads to disastrous accidents [1,2]. Therefore, the safety and reliability of atmospheric and vacuum unit equipment is more prominent. The atmospheric and vacuum distillation unit mainly distills crude oil by physical methods to generate gasoline, diesel oil, residue and other components, which provide […]

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Design idea of heat exchanger

What is a heat exchanger? Heat exchanger is a kind of equipment that transfers part of heat from heat fluid to cold fluid, also known as heat exchanger. Heat exchanger plays an important role in chemical, petroleum, power, food and many other industrial production. It can be used as heater, cooler, condenser, evaporator and reboiler in chemical production.   Classification of heat exchanger: Shell and tube heat exchanger can be divided into the following two types according to the structural characteristics.1. Shell and tube heat exchanger with rigid structure: this kind of heat exchanger is also a fixed tube plate, […]

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A complete set of pressure test methods for gate valve, globe valve and other ……

Generally, industrial valves are not subject to strength test in use, but after repair, the valve body and bonnet or the valve body and bonnet damaged by corrosion shall be subject to strength test. For safety valve, its constant pressure, reseating pressure and other tests shall conform to the specifications and relevant regulations. Before valve installation, valve strength test and valve sealing test shall be conducted on the valve hydraulic test bench. Spot check 20% of low-pressure valves, 100% of unqualified ones; 100% of medium and high-pressure valves. The commonly used media for valve pressure test are water, oil, air, […]

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How to carry out quality control when installing process pipeline in chemical ……

If the chemical plant is compared to a person, the equipment must be the “heart part”; the process pipeline for transporting raw materials, water, gas, finished products, etc. is the “artery”, which plays an important role in the production process. Therefore, at the beginning of project construction, it is necessary to strictly control the quality of process pipeline installation. If the quality is not good, it will greatly affect the normal production in the future. As a chemical construction unit, controlling the quality of process pipeline installation is the key to the survival of the installation enterprise, and also the […]

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Installation and inspection of high strength bolts

I. Preface The high-strength bolts for steel structure produced by domestic high strength bolts manufacturers mainly include A325 and A490 of American ASTM specification, f10t and s10t of Japanese JIS specification. Domestic high strength bolts manufacturers will produce bolts of Japanese and American specifications at the same time, because of the design specifications used in China, mainly referring to American AISC specifications; while the manufacturing and construction of steel structure factories mostly follow Japanese standards. Therefore, most of the steel structures of buildings use the torque control high-strength bolts of Japanese specifications, but the bolts used in bridge engineering are […]

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Application and Development of Duplex Stainless Steel

Duplex stainless steel consists of ferrite phase and austenite phase in its quenched structure, and the content of the minimum phase may reach 30%. Duplex stainless steel is formed on the basis of 18-8 austenitic stainless steel by increasing the content of Cr or adding other ferrite elements, which makes the steel have two-way structure of austenite and ferrite, and saves Ni alloy. Duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel by correctly controlling chemical composition and heat treatment process due to the characteristics of two-phase structure of bidirectional stainless steel. Duplex stainless […]

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Tool Wear, Surface Topography, and Multi-Objective Optimization of Cutting Par……

The application of AISI 304 austenitic stainless steel in various industrial fields has been greatly increased, but poor machinability classifies AISI 304 as a difficult-to-cut material. This study investigated the tool wear, surface topography, and optimization of cutting parameters during the machining of an AISI 304 flange component. The machining features of the AISI 304 flange included both cylindrical and end-face surfaces. Experimental results indicated that an increased cutting speed or feed aggravated tool wear and affected the machined surface roughness and surface defects simultaneously. The generation and distribution of surface defects was random. Tearing surface was the major defect […]

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Corrosion Behavior of Nickel-based Alloy 718 in H2S/CO2 Environment

With the development of oil and gas exploration, more and more acidic oil and gas fields have emerged. Such oil and gas fields generally contain CO2, H2S and Cl-and other corrosive media, which are easy to cause severe corrosion of oil casing and seriously threaten the safe production of oil and gas fields. The effective anticorrosive measures commonly used in the world are the use of anticorrosive materials [1]. Among them, nickel-based anticorrosive alloys have become the focus of material selection because of their excellent comprehensive anticorrosive properties. Foreign research and application practice also show that the use of nickel-based […]

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Corrosion Prevention Measures for Metal Valves

1 Overview Corrosion is one of the main causes of damage to metal valves. The corrosion of metal valves is mainly electrochemical corrosion. In the use of valves, the first consideration of corrosion protection is to eliminate electrochemical corrosion. When electrochemical corrosion can not be eliminated, passivation film should be formed on the metal surface, or non-metallic materials should be used instead of metal materials to control the occurrence of corrosion. 2 Elimination of electrochemical corrosion 2.1 Material Selection Many mediums are corrosive, and their corrosion principle is very complex. Even if the same valve material is used in the […]

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