常用锅炉管材介绍（Introduction of boiler tubes）.docVIP

常用锅炉管材介绍（Introduction of boiler tubes） Introduction of boiler tubes 20G: nabiao steel GB5310-95 (foreign brands: Germany ST45.8, corresponding to STB42 of Japan, the United States SA106B), the most commonly used for boiler tube steel, chemical composition and mechanical properties and the 20 board is basically the same. The steel has a certain strength at room temperature, medium and high temperature, low carbon content, better plasticity and toughness, and its cold and hot forming and welding properties are good. It is mainly used in the manufacture of high pressure boiler tube and higher parameters, low temperature superheater and reheater, economizer and water wall; if the wall temperature is not higher than 500 DEG of small bore pipes, tubes and water cooling tubes, economizer, steam pipe, wall temperature is less than or equal to 450 DEG C large diameter pipe header (economizer, water cooling wall, low temperature superheater and reheater header), medium temperature are less than 450 of the pipeline accessories etc.. Because carbon steel is longer than 450 degrees of temperature, graphitization will be produced. Therefore, as the heating surface, the pipe is the longest and the service temperature should be limited to below 450 centigrade. The steel in this temperature range, its strength can meet the superheater and steam pipe requirements, and has good oxidation resistance, plasticity, toughness, welding properties, such as cold and hot processing performance is very good, widely used. The steel in the furnace of Iran (a single) used on the site for the introduction of water pipe (the number of 28 tons), soda pipe (20 tons), steam connecting pipe (26 tons), box set economizer (8 tons), desuperheating water system (5 tons), the rest is flat, the materials used (about 86 tons). SA-210C (25MnG): ASME SA-210 in the standard grade of steel is carbon manganese steel boiler and superheater tubes with small diameter, pearlitic heat resistant steel. Our country was tr