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The rejection rate is 100%, and the crack of ring forging is caused by forging……

During the processing of 18crmntih ring blank in a flange factory, it is found that there are cracks and scrap products with large crack defects and high scrap rate. The preliminary inspection of the crack defects shows that the crack is caused by the original crack of raw material bar. In view of this situation, the cracked parts were inspected, and the scrap situation was inspected at the processing site of the forging plant, so as to observe the macro defects and determine the causes of cracks. Macro morphology of defective parts Parts processing process: sawing cutting → induction heating […]

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Basic knowledge and preventive measures of valve corrosion

Corrosion is one of the important elements causing valve damage. Therefore, in the valve protection, valve anti-corrosion is an important issue to consider. What is the corrosion of valves? How to carry out valve anticorrosion? What is the basis for the selection of corrosion-resistant valves? Listen, how do you get here. Corrosion forms of valves The corrosion of metals is mainly caused by chemical corrosion and electrochemical corrosion, and the corrosion of non-metallic materials is generally caused by direct chemical and physical effects. Chemical corrosion Under the condition of no electric current, the surrounding medium directly acts with metal to […]

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Analysis of anti corrosion status and Countermeasures of special shaped parts ……

In the marine environment, bolts and other special-shaped parts are very common, which are the key basic parts in the mechanical industry. Due to the influence of salt and relative humidity in the marine environment, bolts and other special-shaped parts cause serious corrosion problems, security risks and huge economic losses. At present, there are many ways to solve the corrosion of special-shaped parts such as bolts. This paper briefly analyzes the basic measures and ideas of corrosion protection of special-shaped parts around the anti-corrosion solutions of special-shaped parts. Starting from the surface treatment technology, it discusses the anti-corrosion measures such […]

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How to improve the efficiency of plate heat exchanger

Optimization design direction of plate heat exchanger In recent years, the technology of plate heat exchanger is becoming more and more mature. It has high heat transfer efficiency, small volume, light weight, low dirt coefficient, easy disassembly, many kinds of plate, wide application range, and has been widely used in the heating industry. The plate heat exchanger can be divided into detachable, welded, brazed and shell type according to the assembly method. Because the removable plate heat exchanger is easy to be disassembled and cleaned, and the area of the heat exchanger is flexible, it is widely used in heating […]

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Seven structural forms of screw connection

Screw connection is used to connect two thin parts. There is a through hole on the connected part, and the parts are tightly connected through the screw connection of bolt and nut. For the convenience of practical operation, there is a certain gap between the screw and the hole. The structure is simple, and the loading and unloading is convenient. It is a common connection method in the automobile industry. According to the structural form, material differences, functional requirements and other screw joint structural forms are mainly divided into seven kinds. Common bolt + common nut In this structure, bolts, […]

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What is an orifice valve

What is an orifice valve? Orifice valve is a new type of flow metering and throttling device. Orifice valve is the most widely used flow meter in the world. Orifice valve is suitable for flow measurement of natural gas, oil, gas, water and other gases and liquids with or without sulfur. It is widely used in energy, petroleum, chemical and metallurgical industries. The research on standard throttling device is worldwide, and its depth is unmatched by other flow meters. It is because of the abundant data and statistical data accumulated in the experimental research that this kind of flowmeter does […]

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What is a steam valve

What is a steam valve? The steam valve is to control the opening of the opening and closing parts in the valve body to adjust the flow of the medium and reduce the pressure of the medium. At the same time, it can adjust the opening of the opening and closing parts with the help of the pressure behind the valve to keep the pressure behind the valve within a certain range. Under the condition of the constant change of the inlet pressure, it can keep the outlet pressure within the set range and protect the subsequent life and production […]

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How to choose the right regulating valve?

The regulating valve is the terminal executive element in the industrial process control system. In the industrial process continuous production automatic control system, regulating valve is generally needed to control various process parameters in the process production to achieve the pressure on fluid, the adjustment of parameters such as temperature, flow and liquid level is usually called “hands and feet” in industrial process automation production “. Its application quality is directly reflected on the regulating quality of the system. As a terminal actuator in process control, people have a deeper understanding of its importance than in the past. The application […]

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How to install pipe valve and overhaul?

The function of the valve is to control or adjust the flow state of the fluid. In the construction process, the quality of valve installation directly affects the normal operation in the future, so we must pay attention to it.  So, how to install the valve? What are the main points of valve installation? What are the taboos and precautions? Five main points of valve installation Direction and position Many valves have directionality, such as stop valves, throttle valves, pressure reducing valves, check valves, etc. If they are installed reversely, it will affect the use effect and life (such as […]

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Six heat treatment questions

What is annealing of steel? What are the types and uses of annealing? Answer: Annealing of steel: Annealing is a heat treatment process that heats steel to a temperature above or below the critical point AC1, and then slowly cools it with the furnace after holding it for a certain period of time to obtain a nearly equilibrium structure. Annealing types: According to the heating temperature, it can be divided into annealing above or below the critical temperature AC1. The former includes complete annealing, incomplete annealing, spheroidizing annealing, and homogenizing annealing, and the latter includes recrystallization annealing and stress relief […]

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