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Outer Diameter 20mm Wall Thickness 4mm Inner Diameter 12mm Carbon Steel/Iron Pipe Precision Steel Pipe
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Precision bright pipe is a kind of common seamless steel pipe (or de-diameter welded steel pipe) through fine drawing or cold rolling process of a high precision steel pipe material. Because the inner and outer walls of the precision bright tube have no oxide layer, no leakage under high pressure, high precision, high finish, no deformation in cold bending, flaring, flattening, no cracks and so on, it is mainly used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders, can be seamless tube, but also welded tube.
The chemical composition of precision bright tube includes carbon C, silicon Si, Manganese Mn, sulfur S, phosphorus P and Chromium Cr. High quality carbon steel, fine rolling, non oxidation bright heat treatment (NBK state), non-destructive testing, the inner wall of the steel pipe is scrubbed with special equipment and washed by high pressure, the anti-rust oil on the steel pipe is treated with anti-rust, and the ends of the cover is treated with dustproof. The inner and outer walls of the steel pipe are of high precision and high smoothness. After heat treatment, the steel pipe has no oxidation layer and high inner wall cleanliness. The steel pipe can withstand high pressure, no deformation in cold bending, no crack in flaring and flattening. Steel tube color: white and bright, with high metallic luster.
Main uses:
The precision and finish of steel pipe are required by automobile and mechanical parts. Precision steel pipe users are not only the users with high requirements for accuracy and finish, because of the high precision of precision bright pipe, the tolerance can be kept at 2- 8 wire, so many mechanical processing users in order to save labor, material, time loss, the seamless steel pipe or round steel is slowly transformed into precision bright pipe.
The effects of elements in precision bright tubes on high temperature tempering brittleness can be divided into:
(1) Trigger the high temperature tempering brittle impurity elements such as phosphorus, tin, antimony and so on.
(2) Alloying elements that promote or slow down high temperature tempering brittleness in different forms and degrees. Chromium, manganese, nickel, silicon and so on to promote the effect, and molybdenum, tungsten, titanium and so on to delay the effect. Carbon also plays a catalytic role.
General carbon precision bright tube on high temperature temper brittleness is not. The sensitivity of binary or multicomponent alloy steel containing chromium, manganese, nickel and silicon varies with the type and content of alloying elements.
The sensitivity of the original structure of the tempered precision bright tube to the high temperature tempering brittleness of steel is significantly different. Martensite tempering structure is the most sensitive to high temperature tempering brittleness, bainite tempering structure is the second, pearlite structure is the least.
The nature of high temperature tempering brittleness of precision bright tubes is generally believed to be the result of grain boundary embrittlement caused by the segregation of phosphorus, tin, antimony, arsenic and other impurity elements at the original austenite grain boundary. The co-segregation of manganese, nickel, chromium and other alloying elements with the above impurity elements occurred at the grain boundary, which promoted the enrichment of impurity elements and intensified the embrittlement. Molybdenum, on the contrary, has strong interaction with phosphorus and other impurity elements, which can produce precipitated phase in the grain and hinder the segregation of phosphorus grain boundary, and can reduce the tempering brittle rare earth elements. Titanium can effectively promote the precipitation of impurity elements such as phosphorus in the grain, so as to weaken the grain boundary segregation of impurity elements and slow down the high temperature tempering brittleness.
