Supply A350LF2 American standard round steel price

&Wuxi supplies American standard round steel prices
>Wuxi Shangguang Nuclear Power Materials Co., Ltd. is an entity company mainly engaged in chemical, power and petrochemical pipelines and supporting pipe fittings.
>Alloy structural steel (), steel used as mechanical parts and various engineering components and containing one or several certain amounts of alloy elements.
>This type of steel, due to its appropriate hardenability, after appropriate metal heat treatment, the microstructure is uniform sorbite, bainite or extremely fine pearlite, so it has high resistance. The tensile strength and yield-to-strength ratio (generally around .), higher toughness and fatigue strength, and lower toughness-to-brittle transition temperature can be used to manufacture machine parts with larger cross-section sizes.
>The role of alloying elements: There are three aspects: ①Increase the hardenability of steel. Hardenability refers to the depth to which the martensite layer is quenched from the surface when steel is quenched. It is the main parameter to achieve good overall performance. Except for C, almost all alloying elements such as, , and B can improve the hardenability of steel, among which B has the strongest effect, followed by C. Strong carbide-forming elements such as b can only increase the hardenability of steel when dissolved in austenite. ②Influence the tempering process of steel. Since alloy elements can hinder the diffusion of various atoms in steel during tempering, compared with carbon steel at the same temperature, they generally play the role of delaying the decomposition of martensite and the aggregation and growth of carbides, thus improving the The tempering stability of steel, that is, improving the tempering softening resistance of steel, has a more significant effect, while the effect of . When steel containing a higher content of carbide-forming elements such as etc. is tempered at ~°C, fine and dispersed special carbide material points such as C are precipitated to replace part of the coarser alloy cementite, so that the strength of the steel no longer decreases. On the contrary, it rises, that is, secondary hardening occurs (see tempering). It can prevent or weaken the temper brittleness of steel. ③ Affects the strengthening and toughening of steel. Solid solution strengthening is used to strengthen carbide-forming elements such as ferrite b, and the yield strength of steel is increased by both dispersion hardening and solid solution strengthening. The strengthening effect of carbon is the most significant. In addition, adding these alloying elements generally refines the austenite grains and increases the strengthening effect of grain boundaries. The factors that affect the toughness of steel are relatively complex. Improving the toughness of steel will easily coarsen the austenite grains, reduce the sensitivity to temper brittleness, increase the purity of steel, and play an important role in improving the toughness of steel (see Strengthening of Metals ).
>Alloy structural steel is generally divided into quenched and tempered structural steel and surface-hardened structural steel.
>① The carbon content of quenched and tempered structural steel is generally about .%~.%. For structural parts with a given cross-section size, during quenching and tempering treatment (quenching and tempering), if it is quenched along the section If it is quenched through, the mechanical properties will be good. If it is not quenched through, free ferrite will appear in the microstructure, and the toughness will decrease. For steels with tempering brittleness tendency, such as manganese steel, chromium steel, nickel-chromium steel, etc., they should be cooled quickly after tempering. The quenching critical diameter of this type of steel increases with the increase in grain size and alloying element content. For example, He steel is about ~, while He steel is about ~. It is often used to manufacture shafts and connecting rods that bear larger loads. and other structural parts.
>②Surface hardened structural steel is used to manufacture parts with hard and wear-resistant surfaces and flexible cores, such as gears, shafts, etc. In order to ensure high toughness in the core of the part, the carbon content in the steel should be low, generally between . Nitrided steel also needs to add alloying elements that easily form nitrides (such as etc.). Carburized or carbonitrided steel, after carburizing or carbonitriding at ~℃, is quenched and used in a low temperature tempering (about ℃) state. Nitrided steel has been nitrided (~℃) and used directly without quenching and tempering.
>All prices are negotiable!
>