The heat treatment of large forgings of copper tubes is mainly directly forged from steel ingots. Therefore, the influence of smelting, ingot casting, forging and other processes on the internal quality of the castings must be considered during heat treatment, as long as the influencing factors are uneven chemical composition and multiple smelting defects.The presence of; the crystal grains are coarse and very uneven; more gas and impurities; greater forging stress and heat treatment stress.
The purpose of heat treatment after forging of large forgings is to prevent white spots and hydrogen embrittlement, improve the internal structure of forgings, eliminate forging stress, reduce hardness and improve cutting performance, so that it can obtain good mechanical properties or prepare for subsequent heat treatment. The forging of 317L stainless steel pipe belongs to the casting of large forgings. Manganese can increase the strength of steel, weaken and eliminate the harmful effects of sulfur, and improve the hardenability of steel. High-alloy steel (high manganese steel) with high manganese content has good wear resistance and other physical properties. performance. Silicon can increase the hardness of steel, but its plasticity and toughness are reduced. Electrical steel contains a certain amount of silicon, which can improve soft magnetic properties. Tungsten can improve the red hardness and thermal strength of steel, and can improve the wear resistance of copper pipes. Chromium can improve the hardenability and wear resistance of steel, and can improve the corrosion resistance and oxidation resistance of steel.
Vanadium can refine the grain structure of steel and improve the strength, toughness and wear resistance of steel. When it melts into austenite at high temperature, it can increase the hardenability of steel; conversely, when it exists in the form of carbides, it will reduce its hardenability. Molybdenum can significantly improve the hardenability and thermal strength of the copper tube, prevent temper brittleness, increase remanence and coercivity, and titanium can refine the grain structure of the copper tube, thereby increasing the strength and strength of the copper tube. toughness. The advantages of copper tube convection technology are very light. Under the same heat dissipation condition, copper tube convection radiator has a larger cavity and lighter weight than other forms of radiator. If the weight of the steel column radiator is 1.0, the finned tube convector is 1.06, the plate type is 0.7, and the copper tube convection radiator is only 0.51; after the copper tube convection radiator is filled with water, the structural load of the building should be light. After the copper pipe convection radiator is filled with water, the structural load of the building should be light.
The adjustment is sensitive. Due to the different mechanism and internal structure of the radiator, the water capacity of the copper tube convection radiator is the smallest. Therefore, this kind of products can adjust the indoor temperature flexibly and accurately by using the temperature control valve, and the temperature rises quickly.