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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 […]

2020-02-22 read more...
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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 […]

2020-02-21 read more...
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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 […]

2020-02-21 read more...
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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 […]

2020-02-20 read more...
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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 […]

2020-02-19 read more...
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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 […]

2020-02-18 read more...
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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 […]

2020-02-17 read more...
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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 […]

2020-02-17 read more...
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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 […]

2020-02-13 read more...
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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 […]

2020-02-12 read more...
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