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Galvanized steel pipe is divided into cold galvanized steel pipe, hot galvanized steel pipe, cold galvanized steel pipe has been banned, the latter is also advocated by the state can be used temporarily. In the 1960s and 1970s, the developed countries in the world began to develop new types of pipes and gradually banned galvanized pipes. China's Ministry of Construction and other four ministries and commissions have also issued a document to prohibit galvanized pipes as water supply pipes from 2000, the cold water pipes in the new community have rarely used galvanized pipes, and the hot water pipes in some communities use galvanized pipes. Hot-dip galvanized steel pipe has a wide range of applications in fire, power and highway

1. Construction field Stainless steel pipes are mainly used in the construction field for water supply pipes, drainage pipes, fire pipes, wire pipes and so on. Because stainless steel pipes have excellent corrosion resistance and strength, they can maintain the luster and fluency of the pipes for a long time, so they are widely used in high-rise buildings, Bridges, tunnels and other large projects. 2. Industrial sector Stainless steel pipes are also widely used in industrial fields, such as chemical, petroleum, food and other industries. Because stainless steel pipes can withstand extreme environments such as high temperature, high pressure and strong corrosion, they are also widely used in chemical reactors, pressure vessels, boilers and other equipment. 3. Furniture Stainless steel pipes have also been widely used in the field of furniture, such as dining chairs, dining tables, TV cabinets, etc. Because stainless steel pipe has the advantages of high strength, easy processing, beautiful and generous, it is more and more favored in modern furniture design. In short, stainless steel pipe, as an excellent metal material, has been widely used in various fields. With the continuous development of science and technology in the future, the application prospects of stainless steel pipes will also be broader.

304 stainless steel is a common material in stainless steel, with a density of 7.93 g/cm³; The industry is also called 18/8 stainless steel, which means containing more than 18% chromium and more than 8% nickel; High temperature resistance 800℃, with good processing performance, high toughness characteristics, widely used in industrial and furniture decoration industry and food and medical industry. However, it should be noted that compared with ordinary 304 stainless steel, food-grade 304 stainless steel has a more stringent content index. For example, the international definition of 304 stainless steel is mainly chromium 18%-20% nickel 8%-10%, but food-grade 304 stainless steel is chromium 18% and nickel 8%, allowing a certain range of fluctuations, and limiting the content of various heavy metals. In other words, 304 stainless steel is not necessarily food-grade 304 stainless steel Among the common marking methods on the market are 06Cr19Ni10 and SUS304, of which 06Cr19Ni10 generally indicates national standard production, 304 generally indicates ASTM standard production, and SUS304 indicates daily standard production. 304 is a versatile stainless steel, which is widely used in the production of equipment and parts requiring good comprehensive properties (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel content. 304 stainless steel is a grade of stainless steel produced according to ASTM standards in the United States

China's ductile iron pipe industry started in the early 1990s, with the strong support of the China Urban Water Supply Association to develop rapidly, after nearly 30 years of practice, its safety, practicality has been widely recognized by the water supply industry, in 2008, the domestic annual output has reached 2.2 million tons, is 11 times that of 1990. As China is a country lacking of water resources, there are more than 600 water shortage cities, more than 200 serious water shortage cities, water supply and water-saving cause is on the rise, ductile iron pipe has broad prospects for development.

1. Different nature: 1. Carbon steel plate: iron carbon alloy with carbon content of 0.0218%~2.11%. 2, steel plate: a high-strength steel. 2. Different characteristics: 1, carbon steel plate characteristics: (1) It contains small amounts of silicon, manganese, sulfur and phosphorus. (2) The higher the carbon content in carbon steel, the higher the hardness and strength, and the lower the plasticity. 2, steel plate characteristics: Under strong impact and extrusion conditions, the surface hardening is rapid, maintaining good toughness and plasticity of the core austenite, and the hardened layer has good wear resistance. This is incomparable to other materials. However, the wear resistance of the steel plate shows its superiority only when there are sufficient work hardening conditions, and in other cases it is very poor. 3. Different applications 1, carbon steel material application: mainly used in the manufacture of complex shapes, high mechanical properties, and in the process is difficult to use forging and other methods of forming more important mechanical parts, such as automobile gearbox shell, locomotive and vehicle couplings and couplings. 2, steel plate application: (1) The resistance of the steel plate does not change much with temperature, and is used to manufacture precision electronic instruments. (2) Steel plate is an excellent material for crushing parts. Carbon steel plate and steel plate difference Carbon steel plate is iron-carbon alloy material, steel plate has alloy steel, stainless steel, including carbon steel plate. Carbon steel plate has low carbon steel, medium carbon steel, high carbon steel plate, hardness strength increases with the increase of carbon content, such as the commonly used Q235 low carbon steel plate, there are 45 medium carbon steel plate. Alloy steel plate is based on carbon steel adding alloying elements smelting, such as Q345 low alloy high strength manganese plate. Stainless plates contain chromium and chromium nickel alloy materials.

First, the basic concept and application range of carbon structural steel Carbon structural steel refers to steel materials with a carbon content of no more than 2.11%, which are widely used in manufacturing, construction, metallurgy, shipbuilding, machinery manufacturing, petroleum and chemical industries. It has good plasticity, weldability and machinability, and the price is relatively low, with a relatively high cost performance. Two, several types of steel commonly used in carbon structural steel 1. Q235 steel: It is a commonly used low carbon steel, mainly used in general engineering structure and mechanical manufacturing. It has the advantages of good strength, good ductility and low cost, and is widely used in Bridges, buildings, ships and other fields. 2. Q345 steel: It is a medium and high strength low alloy steel, which is widely used. It has higher strength and better ductility than Q235 steel, and is widely used in Bridges, ships, petrochemical and construction fields. 3. 20# steel: It is a commonly used carbon structural steel and is widely used. It has the advantages of high strength, good toughness, good wear resistance, etc., and is widely used in machinery manufacturing, auto parts, bearings, hammers and other fields. 4. 45# steel: It is a kind of advanced carbon structural steel with a wide range of applications. It has the characteristics of high strength, high toughness, good wear resistance, etc., and is widely used in the manufacture of excavators, machine tools, rail transit and other fields. 5. 65Mn steel: It is a medium carbon structural steel, mainly used in the manufacture of springs and stamping parts. It has good elasticity, bending resistance and corrosion resistance, and is widely used in automobile, machinery manufacturing, ships and other fields. In general, the choice of carbon structural steel mainly depends on the specific application field and use environment. In different fields and environments, the appropriate steel grade should be selected to ensure the use effect and saf

Stainless steel export is an important part of China's export economy, it plays an important role in stimulating China's economic growth, but from the current situation of China's stainless steel foreign trade, China's stainless steel exports have met greater resistance. Since last year, foreign frequently came to China's stainless steel casting products for "double reverse" news, which has a great impact on China's stainless steel casting industry, exports are a large part of the development of China's stainless steel industry, in its industrial development occupies a huge market share, in the face of economic downturn, the development of the slowdown of the case, The development of China's stainless steel industry should constantly improve product quality, better develop overseas trade and cope with the suppression of trade protectionism, combine products with environmental protection, energy resources, cultural environment, and enhance the competitiveness of stainless steel products, only in this way can we achieve an invincible position in foreign trade.

SPCC is a kind of universal low carbon Steel, its full name is "Steel Plate Cold Rolled Commercial", Chinese translation is "commercial cold rolled plate". This steel is generally used to make some common cold-rolled products, such as automotive sheet metal, household appliance shell, mechanical parts and so on. The chemical composition and mechanical properties of SPCC steel are usually specified in accordance with the Japanese industrial standard JIS G3141. Its chemical composition includes carbon (C), manganese (Mn), silicon (Si) and phosphorus (P) and other elements, its main characteristics are low carbon content, good cold working performance and weldability. The main manufacturing process of SPCC steel is cold rolling, which can make the surface of the steel plate more smooth, improve its surface quality and dimensional accuracy. In addition, SPCC steel can be heat treated as needed to improve its mechanical properties.

Stainless steel export is an important part of China's export economy, it plays an important role in stimulating China's economic growth, but from the current situation of China's stainless steel foreign trade, China's stainless steel exports have met greater resistance. Since last year, foreign frequently came to China's stainless steel casting products for "double reverse" news, which has a great impact on China's stainless steel casting industry, exports are a large part of the development of China's stainless steel industry, in its industrial development occupies a huge market share, in the face of economic downturn, the development of the slowdown of the case, The development of China's stainless steel industry should constantly improve product quality, better develop overseas trade and cope with the suppression of trade protectionism, combine products with environmental protection, energy resources, cultural environment, and enhance the competitiveness of stainless steel products, only in this way can we achieve an invincible position in foreign trade.

Seamless steel pipe is a long strip of steel with a hollow section and no joints around it. The steel pipe is divided into hot rolled and cold drawn (rolled) two kinds, hot rolled seamless pipe is generally processed on the automatic lathe, its outer diameter, wall thickness size accuracy is high, the surface is smooth, the wall thickness is uniform, can be fixed or double size delivery; The specifications of cold-rolled (dial) seamless steel pipes are expressed by external dimensions (such as outer diameter or side length) and wall thickness, and the size range is 2-200mm in diameter. Seamless steel pipe use is very common: 1. Generally, seamless steel pipes will be used on the pipeline to transport liquid pipes or gas pipes. 2. This type of pipe can be used when the fluid needs to be transported. 3. These types of pipeline materials are often used in building construction. 4. It is used more in the chemical industry. 5. It is also used more in some special environments. 6. There are also some places where mechanical structures are used more often and this type of pipeline will be used. 7. There is also the automobile manufacturing and other industries will often use this type of pipe. The material of seamless steel pipe is 1020#, 20#a~40#a and b-42crmo, 12cr1mov, 10crmo910, 15crmo, 35crmo and other materials of seamless pipe, alloy pipe is the upgrade product of seamless steel pipe. Because its performance is better than the ordinary seamless steel pipe, it is widely used in the oil and natural gas industry as the pipeline pipe for transporting petroleum gas and the heat-resistant alloy pipe for high pressure boilers. The internal and external surfaces of the low carbon precision bright tube have been strictly deoiled and treated with the United States matte film covering technology to make the appearance of the product more beautiful and not easy to oxidize rust longer service life!

8163 seamless steel tube (fluid tube) is a type with a hollow cross section and no weld from head to tail. Steel pipe has a hollow cross section, a large number of used for conveying fluid pipe conveying oil, natural gas, gas, water and some solid materials pipeline. Compared with solid steel such as round steel, steel pipe has the same bending and torsional strength and light weight. It is a kind of economic cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile drive shaft, bicycle frame and steel scaffolding used in construction, etc. Making ring parts with steel pipe can improve the material utilization rate, simplify the manufacturing process, save the material and processing time, such as rolling bearing rings, jack covers, etc., have been widely used in steel pipe manufacturing. Steel pipe is also an indispensable material for all kinds of conventional weapons. Gun barrel and barrel are made of steel pipe. Steel pipe can be divided into round pipe and special pipe according to the different shape of cross-sectional area. Since a circle has the largest area when the circumference is equal, more fluid can be transported with a circular tube. In addition, the annular section is subjected to the internal or external radial pressure, the force is relatively uniform, therefore, the vast majority of steel tubes are round tubes.

In the first ten days of October, the social stock of steel rose 6.0% month on month China Iron and Steel Association Market Research Department China Iron and Steel Association steel social inventory monitoring report shows that in the first ten days of October, 21 cities five varieties of steel social inventory is 9.03 million tons, a monthly increase of 51 million tons, up 6.0%, the inventory fell for the first time after 10 days of recovery; 1.15 million tons more than at the beginning of the year, up 14.6 percent; It was 2.09 million tons lower than the same period last year, down 18.8 percent. South China is the area with the largest increase In the first ten days of October, according to the region, the inventory of seven regions except the Northeast region fell month-on-month, all the other regions recovered. The specific situation is as follows: the inventory in South China increased by 230,000 tons month-on-month, up 11.6%, which was the largest increase. Central China increased by 120,000 tons, up 13.6%, with the largest increase. East China increased by 100,000 tons, up 4.2 percent; Southwest China increased by 80,000 tons, up 5.2 percent; North China increased by 60,000 tons, up 7.1 percent; Northwest China increased by 30,000 tons, up 6.5 percent; Inventories in the Northeast fell by 110,000 tons month-on-month, down 23.9 percent. In addition to wire rods, Five varieties of steel social inventory picked up In the first ten days of October, five kinds of steel social inventory in addition to wire rod month-on-month slight decline, other varieties have different degrees of recovery, among which hot rolled coil for the incremental, the largest increase in varieties. The inventory of hot-rolled coil was 1.94 million tons, an increase of 260,000 tons, up 15.5%, indicating a large inventory recovery. 380,000 tons more than at the beginning of this year, up 24.4 percent; That's 160,000 tons more than the same period last year, up 9.3%. The inventory of cold-rolled coil was 1.29 million tons, an

World Steel Association: Steel demand is expected to recover by 1% in 2023 World Steel Association: According to the official website of the World Steel Association (WSA), the association released the latest short-term (2022-2023) steel demand forecast report on April 19, local time, the global steel demand will decline 2.3% in 2022 to 1.7967 billion tons after the growth of 2.8% in 2021; In 2023, steel demand will recover by 1.0 percent to 1,814.7 million tons. The current forecasts are a downward revision from those made in April, reflecting the impact of persistently high inflation and interest rates around the world.