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Production process of stainless steel pipe

Stainless steel pipe is one of the rapidly developing varieties of steel in China, and its output has increased nearly 15 times in recent 20 years. However, due to the gap between process technology and equipment level, many high-grade varieties can not be produced, especially stainless steel and high nickel alloy steel pipes for chemical and nuclear power industries still basically rely on imports. On the key devices of some important equipment in chemical industry, electric power (especially nuclear power) and other industrial departments, stainless steel and high nickel alloy long pipes are often used, with an outer diameter of […]

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Whether the eccentric reducer at the inlet of centrifugal pump is installed on……

To understand this reason, first understand a knowledge point: cavitation phenomenon. Of course, if you only do industrial installation, you don’t need to know so much, because there are complete and correct installation methods in the instructions of each pump manufacturer, and you only need to construct according to the drawings. Cavitation Working principle of centrifugal pump: the driving machine drives the impeller to rotate through the pump shaft to generate centrifugal force. Under the action of centrifugal force, the liquid is thrown to the impeller outlet along the blade channel, and the liquid is collected through the volute and […]

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Judge the cause of tube explosion according to the characteristics of explosio……

The explosion and leakage of boiler tubes is a problem often encountered in boiler operation, which affects the safe and stable operation of the unit. The causes are complex and involve many interdisciplinary subjects, so it is often difficult to make a correct judgment on the causes. The “rapid” emergency repair method can not fundamentally solve the accident, so that the tube explosion of the same reason may occur again, resulting in unnecessary losses. According to the common characteristics of tube explosion in the field, this paper summarizes the methods to judge the cause of tube explosion according to the […]

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Installation of oxygen pipeline

A large amount of oxygen is used in ironmaking, steelmaking, on-line cutting, semi-finished product renovation and other processes in metallurgical plants, which need to be sent to users from oxygen generation station through storage tank and pressure reducing device by oxygen pipeline. The material of oxygen pipe is mostly carbon steel pipe; Stainless steel pipe should be used for the parts with serious corrosion; Small diameter can also be used copper tube or aluminum tube. The diameter of oxygen pipe varies, and the oxygen pipe used in large converter steelmaking can reach 350mm. Oxygen is a kind of strong combustion supporting […]

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Difference and difference of pressure reducing valve, safety valve, pressure s……

Pressure reducing valve, safety valve, pressure stabilizing valve and pressure relief valve are all pressure valves, which are mainly functional differences. The pressure reducing valve is a device that reduces the medium with high pressure to medium with low pressure. The characteristic of the valve is to keep the outlet pressure and temperature within a certain range when the inlet pressure is constantly changing. Safety valve is used to prevent boiler, pressure vessel and other equipment or pipeline from damage due to overpressure. When the pressure is slightly higher than the normal working pressure, the safety valve will automatically open […]

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Experimental study on transverse fretting wear of flange bolts

In order to study the loosening mechanism of flange connection bolts in transverse vibration, the transverse fretting wear test of fasteners was carried out by means of transverse vibration fatigue testing machine, and then the decline process of preload and preload torque of bolt connection under different transverse loads and frequencies was observed, and the wear amount and surface damage were measured. The results show that the decrease of bolt preload can be divided into two stages; At the beginning of the experiment, the decrease of preload is in the plastic deformation stage and the decrease of preload is in […]

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Nine problems in stainless steel welding

What is stainless steel and stainless acid resistant steel? Answer: the content of “chromium” is the main element added in metal materials (other elements such as nickel, molybdenum, etc. also need to be added) It can make the steel in passivation state and has stainless property. Acid resistant steel refers to the corrosion resistant steel in acid, alkali, salt and other strong corrosive media. What is austenitic stainless steel? What are the commonly used brands? A: austenitic stainless steel is the most widely used and has the most varieties. For example: Series 18-8: 0Cr19Ni9 (304) 0cr18ni8 (308) Series 18-12: 00cr18ni12mo2ti […]

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How to distinguish flat welding, vertical welding, horizontal welding and over……

The film evaluators are familiar with the welding method (manual welding or automatic welding), welding type (single-sided welding or double-sided welding), welding position (flat welding, vertical welding, horizontal welding, overhead welding) and its image characteristics, which is very helpful for the correct judgment of defects, and this is also the content of the actual operation film evaluation examination, so this section makes a brief introduction. Identification of welding method (manual welding or automatic welding) The welding method (manual welding or automatic welding) is easy to identify. In most cases, automatic welding has no welding wave image. If the welding wave […]

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How to deal with scratches on stainless steel mirror surface

It is generally known that the stainless steel scratches on the mirror surface appear in the following situations: The first is that before processing, the plate is scratched; It’s just not obvious; This requires judgment of the severity of the scratch. If the scratch area and scratch depth have exceeded the customer’s acceptance of the final product effect, then the plate meeting the requirements should be replaced, that is, the control of processing operators is very important. The second is that the plate has been finished mirror processing, but in the process of coating is not careful to be scratched. […]

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Electrochemical corrosion behavior of 2205 and 316L stainless steel flanges in……

The electrochemical behaviors of 2205 duplex stainless steel flange and 316L stainless steel flange in 5% (volume fraction) HF solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The semiconductor properties of the passive films on the surfaces of the two stainless steels were analyzed by Mott schokkty curves. The results show that both kinds of stainless steel can be passivated in hydrofluoric acid solution, and 2205 duplex stainless steel has wider passivation range and lower dimensional passivation current density. The results show that the surface passive film of 2205 duplex stainless steel has higher passive film resistance and […]

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