The heat treatment of large forgings of copper tubes is mainly directly forged from steel ingots, so the influence of smelting, ingot casting, forging and other processes on the internal quality of castings must be considered during heat treatment, as long as the influencing factors are uneven chemical composition and various smelting defects The existence of; the grain is 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 improve the strength of steel, weaken and eliminate the adverse 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 the plasticity and toughness will decrease. The steel for electrical purposes contains a certain amount of silicon, which can improve the soft magnetic properties. Tungsten can improve the red hardness and thermal strength of steel, and can improve the wear resistance of copper tubes. 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; on the contrary, when it exists in the form of carbide, it will reduce its hardenability. Molybdenum can significantly improve the hardenability and heat strength of copper tubes, prevent temper brittleness, increase remanence and coercivity, and titanium can refine the grain structure of copper tubes, thereby improving the strength and strength of copper tubes. toughness. The advantage of the convection technology of the copper tube is that the weight is very light. Under the same heat dissipation conditions, the copper tube convection radiator has a larger inner cavity and a lighter weight than other forms of radiators. If the weight of the steel column radiator is 1.0, the finned tube convector is 1.06, the plate shape 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 tube convection radiator is filled with water and runs, 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 type of product can adjust the indoor temperature flexibly and accurately by using the temperature control valve, and the temperature rises quickly.