Recently Shipment to Mid Asia Projects

Classification and heat treatment of stainless steel

There are many kinds of classification methods for stainless steel, such as chemical composition, functional characteristics, metallographic structure and heat treatment characteristics. Considering from the aspect of heat treatment, it is more practical to divide according to the metallographic structure and heat treatment characteristics. Types of stainless steel Ferritic stainless steel The main alloy element is Cr, or a small amount of stable ferrite elements, such as Al, Mo, etc., are added, and the structure is ferrite. The strength is not high, the property can not be adjusted by heat treatment, it has certain plasticity and brittleness. It has good corrosion […]

Recently Shipment to Mid Asia Projects

Welding, heat treatment and metallographic analysis of 2205 duplex stainless s……

Development of duplex stainless steel The development and application of duplex stainless steel began in 1930s, and three generations of duplex stainless steel have been developed up to now. First generation duplex stainless steel: (1) AISI329 steel developed in the United States in the 1940s, as a representative, has high Cr and Mo content, good local corrosion resistance, but high carbon content (C ≤ 0.10%). After welding, its joint corrosion resistance and toughness are poor, which limits the application of the steel and is only suitable for casting and forging. (2) Japan has reduced the carbon content of 329 steel […]

Recently Shipment to Mid Asia Projects

Seawater corrosion resistant nuclear grade duplex stainless steel seamless pip……

At present, most of the process pipes in contact with seawater are nuclear grade z2cn1810 stainless steel or rubber lined nuclear grade carbon steel pipes. This kind of materials have weak corrosion resistance to seawater, which is prone to corrosion and leakage of pipes. The maintenance and replacement work during service is also very complex. The traditional way to solve this problem is to add cathodic protection or anti-corrosion coating, but either the cathodic protection system is too complex, the reliability is not high, or the coating falls off. Duplex stainless steel material is the most effective seawater corrosion-resistant material […]

Recently Shipment to Mid Asia Projects

Why to make LNG from coke oven gas?

Why is LNG? LNG (liquefied natural gas) is the abbreviation of liquefied natural gas. Natural gas is a kind of combustible gas produced naturally in the gas field, and its main component is composed of methane. LNG is cooled to – 162 ℃ by natural gas in gas state under normal pressure to make it condense into liquid. After natural gas liquefaction, storage and transportation space can be greatly saved, and it has the characteristics of high calorific value and high performance. LNG is a clean and efficient energy. LNG trade is becoming a new hot spot in the global […]

Recently Shipment to Mid Asia Projects

Heat treatment technology of copper alloy

What is copper alloy? Copper alloy is an alloy made of pure copper and one or several other elements. Pure copper is purple red, also known as red copper. The density of pure copper is 8.96, the melting point is 1083 ℃, and it has excellent conductivity, thermal conductivity, ductility and corrosion resistance. It is mainly used for making electrical equipment such as generator, bus, cable, switch device, transformer, heat exchanger pipeline, flat collector of solar heating device, etc. Common copper alloys are divided into three categories: brass, bronze and white copper. White copper Copper alloy with nickel as the […]

Recently Shipment to Mid Asia Projects

Vacuum heat treatment of titanium alloy

Vacuum oil quenching and vacuum high pressure gas quenching are the main methods of heat treatment. Vacuum oil quenching seriously affects the quality of titanium alloy. The cooling speed of high pressure gas quenching is far from meeting the requirements of solid solution treatment of titanium alloy. Vacuum water quenching is the only key technology to endow solid solution strengthening of titanium alloy. Vertical vacuum water quenching has become a hot spot in the industry due to its fast cooling speed and good solid solution strengthening effect. According to the research status of vacuum heat treatment of titanium alloy in […]

Recently Shipment to Mid Asia Projects

Heat treatment of titanium alloy

Heat treatment characteristics of titanium alloy (1) Martensitic transformation does not change the properties of titanium alloy significantly. This characteristic is different from the martensitic transformation of steel. The heat treatment and strengthening of titanium alloy can only rely on the aging decomposition of metastable phase (including martensitic phase) formed by quenching. Moreover, the heat treatment method of pure A-type titanium alloy is basically not effective, that is, the heat treatment of titanium alloy is mainly used for α + β type titanium alloy. (2) The formation of ω phase should be avoided in heat treatment. The formation of ω […]

Recently Shipment to Mid Asia Projects

Comparison of stress corrosion behavior of U-tubes in titanium (TA2), SAF2205,……

Shell and tube heat exchanger is the most commonly used heat exchanger in petrochemical industry because of its simple structure, solid structure, wide range of materials, free expansion of tube bundle, no temperature difference stress caused by the wall temperature difference between the heat exchanger tube and the shell, and the tube bundle can be pulled out, the weight of the extracted part is light, the design and manufacturing process is mature, the safety is relatively high and the applicability is relatively wide and is widely used. See Figure 1 for the structure of U-tube heat exchanger. Although there is […]

Recently Shipment to Mid Asia Projects

Discussion on nondestructive testing of pressure pipeline

Preface With the development of the times and the progress of science and technology, higher and higher requirements are put forward for the safety, quality and performance of products. Because of the advantages of nondestructive testing technology, it is widely used in the manufacture and use of pressure pipeline products. Common nondestructive testing technology of pressure pipeline Radiographic testing At present, according to the definition of American Society for testing and materials, radiographic testing can be divided into four categories: Photographic testing, real-time imaging testing, tomographic testing and other radiographic testing technologies. Among them, radiographic testing is the most widely […]

Recently Shipment to Mid Asia Projects

Development trend of titanium tube in China

Background of titanium industry in China and application of titanium tube Since 1948, when 2T titanium sponge was produced by magnesium reduction method in the United States, human beings have ushered in the era of titanium industry. Although the real industrialization began in the 1950s, titanium materials have been widely concerned by virtue of its light weight, high strength, corrosion resistance, low thermal conductivity, good high temperature resistance, weldability, non magnetism, good biocompatibility and many other excellent characteristics. However, due to its high production The production cost hinders the wide use of titanium in the industrial field. In recent years, […]

العربيةБългарски简体中文繁體中文DanskNederlandsEnglishFrançaisDeutschBahasa IndonesiaItaliano日本語한국어LatinPortuguêsРусскийEspañolதமிழ்ไทยTürkçe