The heat treatment of large forgings is mainly made of steel ingot directly, so it is necessary to consider the influence of smelting, ingot, forging and other processes on the internal quality of castings during heat treatment, as long as the influencing factor is the existence of chemical composition is not uniform in a variety of smelting defects; The grain size is coarse and very uneven. More gases and impurities; Large 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 organization of forgings, eliminate forging stress, reduce hardness and improve cutting performance, so that it can obtain good mechanical properties or prepare the organization for later heat treatment. The forging of 317L stainless steel pipe belongs to the casting of large forgings. Manganese can improve the strength of steel, can reduce and eliminate the adverse effects of sulfur, and can improve the hardenability of steel, high alloy steel with a high manganese content (high manganese steel) has good wear resistance and other physical properties. Silicon It can improve the hardness of steel, but plasticity and toughness decline, electrical steel contains a certain amount of silicon, 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 is fused into austenite at high temperature, it can increase the hardenability of the steel; On the contrary, when it is present in the carbide form, it will reduce its hardenability. Molybdenum can obviously improve the hardenability and thermal strength of copper tube, prevent tempering brittleness, improve remanence and tenacity, titanium can refine the grain structure of copper tube, thereby improving the strength and toughness of copper tube. Convection technology advantages of copper tube weight is very light In the same heat dissipation conditions, copper tube convection radiator compared with other forms of heat sink, its inner cavity volume is larger, light weight. If the weight of the steel column radiator is 1.0, the fin tube convector is 1.06, the plate type is 0.7, and the copper tube convector is only 0.51; After the copper tube convection radiator is filled with water, the load of the building structure should be light. After the copper tube convection radiator is filled with water, the load of the building structure should be light. 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 product can adjust the indoor temperature flexibly and accurately by using the temperature control valve, and the temperature rises quickly.