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Drilling technology

As the most common tool in hole machining, bit is widely used in mechanical manufacturing, especially for the processing of holes of parts such as cooling device, tube plate of power generation equipment and steam generator. Characteristics of drilling The bit usually has two main cutting edges. During machining, the bit rotates and cuts at the same time. The front angle of the bit is increasing from the central axis to the outer edge, and the cutting speed of the bit closer to the outer circle is higher, and the cutting speed decreases towards the center, and the cutting speed […]

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Guide for selection of corrosion and heat resistant nickel base alloys

Why choose a nickel-based alloy? Nickel-based alloys are both heat and corrosion resistant, making them ideal materials for high temperature corrosive environments. Nickel alloys are useful for chemical equipment exposed to high temperatures (usually defined as temperatures above about 1000 ° F) in corrosive processes. In many cases, high-strength, chemically resistant nickel alloys are the best (if not the only) materials for harsh environments (beyond the corrosion resistance of austenitic and super-austenitic stainless steels). Although more expensive than iron-based alloys, the excellent performance of heat-resistant and corrosion-resistant nickel alloys makes them the most economical choice for long-term use. Composition of […]

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Corrosion resistance characteristics and application of common special metal m……

With the rapid development of China’s economy, especially the acceleration of the technical transformation and upgrading of the chemical industry, the application of special metal materials in China is more and more extensive, especially in the petroleum, chemical and other related industries, which also put forward higher and higher requirements for the materials of production equipment, thus driving the relevant research institutes and processing enterprises in China (such as Hefei General Institute, Baoji non-ferrous metal Institute) The development and research of the processing plant, as well as the improvement of the capability of the relevant equipment manufacturers for the manufacturing […]

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How to choose a face mask?

What is a face mask? Face mask is a kind of sanitary product, which is generally used to filter the air entering the mouth and nose by wearing it on the mouth and nose, so as to block harmful gases, smells and droplets from entering and leaving the mouth and nose of the wearer. It is made of gauze or paper, etc. Masks have a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent, and when working in dust and other polluted environment, wearing masks has a very good effect. Masks can be divided […]

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How to choose the right metal materials to make parts?

Basic principle In the selection of metal materials and forming process, it is necessary to consider whether the material properties meet the requirements under this working condition, whether the forming process is easy when the material is used to make parts, and whether the production and use of materials or parts are economical, i.e. from three aspects of applicability, process and economy. Applicability principle The applicability principle refers to that the selected materials must be able to adapt to the working conditions and meet the requirements of satisfactory use. It is the necessary condition of material selection to meet the […]

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What are the differences between high strength bolts and common bolts?

What is a common bolt? Ordinary bolt, we generally refer to the bolt with low strength level requirements, and in general, it is the ordinary bolt with 4.8 level. Bolts with low hardness and strength are generally produced with ordinary screw wires. The hardness, strength, shoulder tension and torque of ordinary bolt materials are not very high, not very high. High strength bolt generally refers to the bolt of high strength grade. Its screw material, bolt material and bolt material are relatively good, and its hardness is also relatively high. Moreover, after the production and manufacturing, the bolt will be […]

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What is round bar?

What is round bar? Round bar is a long cylindrical metal bar, which has many industrial and commercial applications. The most common application is the shaft. The standard diameter is from 1 / 4 “to 24”. There may be other sizes. There are many kinds of metal types of round steel, including hot rolled steel, cold rolled steel, alloy steel, stainless steel, etc. Classification of round bars Classification by process Round bar is divided into hot rolling, forging and cold drawing. The specification of hot rolled round bar is 5.5-250mm. Among them: 5.5-25 mm small round bar is mostly supplied […]

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What is steel ingot?

What is steel ingot? The molten steel is poured into the mold through ladle to form ingot. After the molten steel is smelted in the steelmaking furnace, it must be cast into ingots or billets of a certain shape before processing. The technological process of casting ingot with mould is called ingot for short. After smelting, except for a few direct castings, most of the steel should be cast into ingots first, and then rolled into various steels, such as plates, bars, pipes, strips, flanges, etc. Heat treatment is required for the manufacture of tools and certain machine parts. Steel […]

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Corrosion resistance of copper nickel alloy used in chemical plant

Stainless steel and nickel alloys are widely used in chemical plant equipment, which are usually in contact with highly corrosive solutions such as sulfuric acid and hydrochloric acid). Although Mo and Ni alloys are expensive and increase the cost of raw materials, they are beneficial to improve the corrosion resistance of materials. Therefore, nickel alloys with high Mo content, such as UNS N10276 or N06022, have been successfully applied. The researchers found that relatively cheap copper can also improve the corrosion resistance of the material. According to the different corrosivity of using environment, improper selection of nickel alloy will lead […]

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What are the types and grades of high performance stainless steel?

What is high performance stainless steel? “High performance stainless steel” belongs to the stainless steel family, and its corrosion resistance in various corrosive media is obviously superior to standard stainless steel such as 304L (containing 18% chromium and 8% nickel, 18-8) and 316L (containing similar chromium and nickel content as 304, and 2% molybdenum, 18-10-2). They have obvious advantages in pitting corrosion resistance and stress corrosion fracture resistance in chloride medium. By using high content of chromium, nickel, molybdenum and nitrogen to obtain enough corrosion resistance, by using very low carbon content in the production process to maintain the corrosion […]

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