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Process instruction for pickling and passivation of 316L austenitic stainless ……

General Austenitic stainless steel has good corrosion resistance and good cold and hot working performance, so it is widely used to manufacture all kinds of pressure vessels with anti-corrosion requirements. The passive film on the surface of austenitic stainless steel has a great influence on its corrosion resistance. The passive film of austenitic stainless steel is mainly obtained by pickling and passivation. Principle of pickling and passivation The phenomenon that the corrosion rate of metal after treatment with oxidizing medium is significantly lower than that before treatment is called metal passivation. The passivation mechanism can be explained mainly by the […]

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Performance difference of Q345A, Q345B, Q345C, Q345D and Q345E steels

Q345 is a kind of steel material. It is a low alloy steel (C < 0.2%), which is widely used in buildings, bridges, vehicles, ships, pressure vessels, etc. Q represents the yield strength of this material. The following 345 refers to the yield value of this material, which is about 345MPa. The yield value will decrease with the increase of material thickness. Q345 has good comprehensive mechanical properties, acceptable low-temperature performance, good plasticity and weldability. It is used as structures, mechanical parts, building structures and general metal structures bearing dynamic loads such as medium and low-pressure vessels, oil tanks, vehicles, […]

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Selection of stainless steel welding materials for pressure vessels

Stainless steel for pressure vessel and its welding characteristics The so-called stainless steel means that after adding a certain amount of chromium into the steel, the steel is in a passive state and has the characteristics of no rust. To achieve this, the chromium content must be more than 12%. In order to improve the passivation of steel, nickel, molybdenum and other elements that can passivate steel often need to be added to stainless steel. Generally speaking, stainless steel is actually the general name of stainless steel and acid resistant steel. Stainless steel is not necessarily acid resistant, but acid […]

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Bolted flange connection structure of flange design

There are many forms of removable sealing devices for pressure vessels, such as threaded connection, socket connection and bolt flange connection in medium and low pressure vessels, among which bolt flange connection with simple structure and convenient assembly is the most common. Bolted flange connection is mainly composed of flange, bolt and gasket, as shown in Figure 1. Figure 1 Bolted flange link structure The bolt has two functions: one is to provide pre tightening force to realize initial sealing and maintain the sealing during operation; The second is to change the bolted flange connection into a detachable connection. The gasket […]

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Pressure test of natural gas pipeline

For the pressure test of natural gas pipeline, the strength and tightness pressure test of the project is generally carried out in sections according to the requirements of the design drawings and the actual situation of the site. Clean water is selected as the pressure test medium. The following is a brief description of pressure test of large diameter and long-distance natural gas pipeline. Construction procedure Preparation ➡ Clean the pipe ➡ Measure the diameter of the pipe ➡ Sheung Shui ➡ strength test  ➡ Tightness test ➡ Sweep water ➡ end Preparation Preparation of pressure test scheme (1) Sectional […]

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What is a seamless steel pipe for three chemicals

What is a seamless steel pipe for three chemicals? Seamless steel pipe used in petroleum, petrochemical and chemical industries(contain coal chemical industry) what say normally namely 3 change use seamless steel pipe, point to petroleum chemical industry commonly, include petroleum refining to change, chemical fiber production, coal chemical industry, chemical industry, chemical fertilizer production uses steel pipe aggregate. According to the production mode of steel pipe, it is divided into seamless steel pipe and welded pipe. Can be divided into carbon steel pipe, alloy steel pipe and stainless steel pipe by steel, and the compound steel pipe widely used in recent […]

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Application of nickel base alloy Inconel 690 in coal to methanol process pipel……

In the coal to methanol production unit, the pipeline from the heating furnace to the reformer is used to transport the mixture of gas and steam under high temperature and high pressure. The material for manufacturing this pipeline is required to have lasting strength, oxidation resistance and vulcanization resistance under high temperature and high pressure. The mixture of gas and steam is a flammable and explosive medium, which is very dangerous. It is required that the pipeline conveying this medium must be safe. The nickel base alloy inconel 690 is an ideal material for manufacturing this kind of nickel base […]

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What is a bellows seal globe valve

What is a bellows seal globe valve? Bellows globe valve is a new type of stop valve. The valve stem seal is a double seal design of bellows + packing. The sealing performance is more reliable than that of ordinary stop valve. The metal barrier formed by the bellows can prevent leakage, and the filler can also provide sealing effect after the bellows fails. The application is safer, energy-saving, environmental protection and zero leakage. The key part of the bellows seal stop valve is the metal bellows. Through the connection between the automatic roll welding cover and the valve stem, […]

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How to buy bellows seal valve

How to buy bellows seal valve? When the medium is toxic, volatile, radioactive or extremely expensive, it is not allowed to be leaked by the reciprocating valve stem, the bellows is often used to seal the valve cover. This special bonnet structure can protect the valve stem and valve packing from contacting with the process fluid. At the same time, the standard or environmental protection stuffing box structure is adopted on the bellows sealing element, which can avoid the disastrous consequences in case of bellows rupture and failure. Therefore, pay attention to observe whether the valve stem packing leaks. If […]

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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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