Seamless steel tube 10
15crmog yield strength | 15crmog chemical composition (ingredient) | 15crmog high pressure boiler tube alloy steel (alloy steel) refers to steel in addition to silicon and manganese as alloying elements or deoxidizing elements, but also contains other alloying elements (such as chromium, nickel, molybdenum , Vanadium, titanium, copper (Chemistry formula Cu), tungsten (wolfram), aluminum, cobalt, niobium, zirconium, and other elements, and some also contain certain non-metal elements (such as boron, nitrogen, etc.) steel. GB9948 seamless steel pipe seamless steel pipe is expressed as outer diameter, wall thickness, thick wall seamless steel pipe is mainly used for machining, coal mine, hydraulic steel, and other purposes. The maximum diameter of 20G high pressure boiler tube is 650mm, and the minimum diameter is 0.3mm. Depending on the application, there are thick-walled pipes and thin-walled pipes. Seamless steel pipes are mainly used for petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors and aviation. GB9948 seamless steel pipe is divided into high pressure seamless steel pipe for fertilizer equipment according to the purpose; seamless steel pipe for geological brick exploration; seamless steel pipe for petroleum brick exploration; seamless steel pipe for petroleum cracking; seamless steel pipe for ships; cold drawn cold rolled precision Seamless steel pipes; various alloy pipes. Because alloy steel contains different types and quantities of alloy elements and adopts appropriate technological measures (pointing to the solution to the problem), it can have higher strength, toughness, hardenability, wear resistance (nài mó), special properties such as corrosion resistance, low temperature resistance, heat resistance, heat resistance, red hardness, etc. Alloy steel has a history of more than 100 years. The industrial use of alloy steel was around the second half of the 19th century. At that time, due to the continuous increase in the production and use of steel, the machinery manufacturing industry needed to solve the problem of steel cutting. In 1868, the British RFMushet invented an ingredient of 2.5% Mn. -7% W self-hardening steel, increasing cutting speed to 5 m / min. With the development of business and transportation, a bridge with a span of 158.5 meters was built on the Mississippi River with chrome steel (1.5-2.0% Cr) in the United States in 1870; due to difficulties in processing components, later, Some industrial countries have switched to nickel steel (3.5% Ni) to build long-span bridges. At the same time, some countries have also used nickel steel to build warships. With the development of engineering technology and the need to speed up the rotating speed of machinery, high carbon chromium rolling bearing steel appeared in Western Europe in 1901. In 1910, 18W-4Cr-1V high-speed tool steel was developed, which further increased the cutting speed to 30 m / min. It can be seen that the advent and development of alloy steel is in line with the requirements of the development of social productive forces, especially inseparable from the needs of machinery manufacturing, transportation and military industries. After the 1920s, alloy steel, as the electric arc furnace steelmaking method was popularized, created favorable conditions for the large-scale production of alloy steel (tiáo jiàn). The development of the chemical industry and the power industry has also promoted the expansion of the variety of alloy steel, so stainless steel (stainless acid-resistant steel (nature: relatively aggressive)) and heat-resistant steel came out during this period. In 1920, E. Mauer of the Germans invented the 18-8 stainless acid-resistant (Acerbity) steel. In 1929, Fe-Cr-Al resistance wires appeared in the United States. By 1939, Germany began to use Austria in the power industry. Martensitic heat-resistant steel. After the Second World War to the 1960s, mainly the era of the development of high-strength steels and ultra-high-strength steels. Due to the development of the aviation industry and rocket technology, many new types of high-strength steels and ultra-high-strength steels appeared, such as Precipitation hardening-type high-strength stainless steels and various low-alloy high-strength steels are representative types of steels. After the 1960s, many new metallurgical (content: extraction of metals or metal compounds from ore) new technologies, especially refining outside the furnace, were generally adopted, and alloy steels began to move towards high purity, high precision (precision) and ultra-low carbon. During development, new types of steel such as martensite (Prescription) steel and ultra-pure ferritic stainless steel have appeared. At present, there are thousands of alloy steel grades and tens of thousands of specifications in the world. The output of alloy steel accounts for about 10% of the total steel output. It is an important metal material used in the national economic construction and national defense construction.