More and more people are now love fitness and the demand of the market for fitness equipment increased significantly, and precision tube is an important part of a fitness equipment, so the precision tube manufacturers in the production of fitness equipment dedicated pipe can be considered.
Rural fitness equipment of steel pipe material requirements is not high, main consideration is the security issues, many of them are made of thick wall steel tube of high strength, corrosion resistance can also, then coated with lacquer can be widely used.
Precision tube is a kind of after finishing or cold rolling process of a high precision of steel tube material. Inside and outside wall of the precision tube without oxidation layer, under high pressure without leakage, high precision, high finish, cold bending deformation, flaring, flattening without cracks a bit, it is mainly used to produce pneumatic or hydraulic components products, such as a cylinder or cylinder, can be a seamless steel pipe, welded pipe. Precise chemical composition of the light pipe with carbon sulfur C, Si, Si, Mn, Mn, S, P, P, chromium Cr.
Precision tube after quenching get martensite structure, in 450 ~ 600 temperature range of tempering; Or after 650 tempering at a slow cooling rate after 350 ~ 600 ; Or after 650 tempering at 350 ~ 650 temperature range heating for a long time, both make the precision tube produces embrittlement phenomenon if have embrittlement of 20 # precision steel tube heated to 650 and then quickly cold again, can restore toughness, therefore is also called % 26 other Reversible temper brittleness throughout % 26; High temperature tempering brittleness show the precision of the light pipe ductile brittle transformation temperatures.
High temperature tempering brittleness. Sensitivity to the toughness of the annealed state and embrittlement is commonly used in a brittle transformation temperature difference (% 26 delta; T). High temperature tempering brittleness, precision tube on the fracture of the intergranular fracture ratio is also higher.
Precision tube elements on the role of high temperature tempering brittleness is divided into: (1) cause precision tube of high temperature tempering brittleness of impurity elements such as phosphorus, tin, antimony, etc. (2) in different forms, different degree increase or decrease high temperature tempering brittleness of the alloy elements. Such as chromium, manganese, nickel, silicon promote role, and delay effect on molybdenum, tungsten, titanium, etc. Carbon also plays a promoting role. General carbon precision tube of high temperature tempering brittleness. Sensitive, containing chromium, manganese, nickel, silicon binary or complex alloy steel is very sensitive, the sensitive degree depends on the alloy elements and different kinds and content.
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