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Why 304 material is not recommended for bolts in flange joint sealing

In flange joint sealing, when carbon steel flange or stainless steel flange is equipped with 304 bolts, leakage often occurs in operation. This lecture will make a qualitative analysis of this. What are the basic differences between 304, 304L, 316 and 316L materials? 304, 304L, 316 and 316L are commonly used stainless steel materials in flange joints (including flange, sealing element and fastener). 304, 304L, 316 and 316L are stainless steel codes of American material standard (ANSI or ASTM), belonging to 300 series of austenitic stainless steel. The corresponding grades of GB/T are 06cr19ni10 (304), 022cr19ni10 (304L), 06cr17ni12mo2 (316), 022cr17ni12mo2 (316L). […]

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Common assembly methods of valves

Valve assembly is the last stage in the manufacturing process. Valve assembly is the process of combining all parts and components of the valve together to make it a product according to the specified technical premise. The whole machine is the most basic unit of valve assembly, and several parts constitute the valve parts (such as valve cover, valve disc parts, etc.). The assembly process of several parts is called component assembly, and the assembly process of several parts and components is called total assembly. Assembly work has a great impact on product quality. Even if the design is accurate […]

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What is the reason for the cracking of 304 austenitic stainless steel pipe wel……

At room temperature, the microstructure of austenitic stainless steel is stable austenite, non-magnetic as a whole, with high toughness, high plasticity and good corrosion resistance, which is widely used in nuclear power plant equipment, pipeline and support structure. Compared with other types of stainless steel, austenitic stainless steel has no phase transformation, is not sensitive to hydrogen, is easier to weld, and the welded joint has better plasticity and toughness in as welded state. The microstructure and mechanical properties of the welded joint directly affect the mechanical properties of the whole weldment, but hot cracks and intergranular corrosion are easy […]

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Naming rules of seven common steels

Steel is a general term for iron carbon alloy with carbon content between 0.02% and 2.11%. In actual production, steel often contains different alloy elements according to different uses, such as manganese, nickel, vanadium and so on. Nowadays, steel has become one of the most used materials in the world because of its low price and reliable performance. Do you know the naming rules of steel? Today, we will introduce that the classification of steel products in China is based on the classification of steel products Carbon structural steel Expression method: Q + number + (quality grade symbol) + (deoxidation […]

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What is a sealing ring

What is a sealing ring? The sealing ring is a ring cover composed of one or several parts, which is fixed on one ring or washer of the bearing and contacts with another ring or washer or forms a narrow labyrinth gap to prevent the leakage of lubricating oil and the invasion of foreign objects. The sealing ring is a kind of rubber ring with circular cross section. Because its cross section is O-shaped, it is called O-shaped sealing ring. It is one of the most widely used hydraulic and pneumatic transmission systems. It is usually called O ring in […]

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What is the difference between different heat treatment processes?

The heat treatment department is an important part of our company. By changing the internal microstructure of the workpiece, or changing the chemical composition of the surface of the workpiece, we can improve the performance of the workpiece. When do you need heat treatment? After the customer places an order, the sawing workshop will cut the die steel according to the customer’s requirements, and then carry out a series of grinding or milling work. According to the needs or rough processing molding mold factory heat treatment, according to the needs of different materials, choose different processes for heat treatment. Classification […]

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Inspection and maintenance of pressure pipeline

When you step into the industrial zone, you will find pressure pipes everywhere. Some of them even smoke. You always feel that they are about to explode at any time. But that’s the truth. Maybe it will explode. If you look at some pictures, you’ll understand. These are the tragedies caused by improper operation or routine inspection. Therefore, it is very important to master the daily inspection items and preventive measures of pressure pipeline accidents. Characteristics of pressure pipeline The so-called pressure pipeline refers to the use of pressure to transport gas, liquid, etc. But not all pipes can be […]

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Cause analysis and improvement measures of cracks in extra large bearing sleev……

Cracks were found in the non-destructive testing process of a super large bearing sleeve after grinding, which led to the failure of normal production. The bearing sleeve is made of GCr15SiMn steel with outer diameter of 800mm and height of 80mm. The processing procedure is: raw material inspection → sawing → forging → spheroidizing annealing → turning → heat treatment → grinding → magnetic particle testing → assembly. In this paper, through the use of macro examination, metallographic examination and other analysis methods, from the bearing sleeve material quality and heat treatment quality of bearing sleeve crack comprehensive detection and […]

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How to choose the right sulfuric acid resistant material

Because of the strong corrosiveness of sulfuric acid, the equipment for producing and using sulfuric acid has caused serious corrosion. In order to prevent or reduce this corrosion and ensure the smooth production, the materials of various sulfuric acid equipment must be selected and used reasonably according to the corrosion characteristics of sulfuric acid and the corrosion resistance of various materials. Corrosion characteristics of sulfuric acid Sulfuric acid is mainly produced by contact method and lead chamber method. Sulfur or sulfide, such as copper sulfide, is burned to form sulfur dioxide. Under the action of oxygen and catalyst, sulfur dioxide […]

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Influence of pipeline resistance on lift and calculation of pipeline loss

As we all know, the pipeline system is a kind of solid matter, and water is easy to flow. If the water in the pipeline is flowing, there must be a part of energy converted into heat energy and “eliminated”, that is, a part of water pressure (or head) is lost. This is the reflection of objective things and the inevitable law of water flow movement. Usually, we call this phenomenon of energy conversion energy loss (or hydraulic loss, head loss). It is measured in meters. What is the effect of pipe resistance on lift? Some users have measured that […]

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