Stainless steel elbow
Stainless steel elbow is different from carbon steel elbow, which is mainly made of materials. Its chemical composition will keep the curved surface for a long time without rust and will not be corroded. Stainless steel is usually a high proportion of Cr, Ni and other alloys based on carbon steel, which can reach up to 20%. The common types of steel are: 304,304 L, 321,316,316 L, 1Cr18Ni9Ti, 0cr18ni9, the first several steel Numbers indicated in the number of the number of the Japanese, the American steel signal method, and the latter one (1Cr18Ni9Ti) for the domestic steel number method.
The stainless steel elbow is made according to standard:
1. The division of manufacturing standards can be divided into national standard, electric standard, water standard, American standard, German standard, Japanese standard, Russian standard and so on.
2. It can be divided into two categories: push, pressing, forging and casting.
Characteristics of stainless steel elbow:
In practical application, steel that is often corroded by weak corrosion medium is called stainless steel, while steel which is resistant to chemical resistance is called acid-resistant steel. Because of the difference in chemical composition of the two, the former is not necessarily resistant to chemical dielectric corrosion, while the latter is generally rustless. Corrosion resistance of stainless steel depends on the alloy element in steel. Chromium is the basic element to stainless steel for corrosion resistance, while about 1.2% chromium content in steel, chromium and oxygen effect of corrosive medium, in the steel surface to form a thin layer of oxide film (since the passivation film), but to prevent further corrosion of steel substrate. In addition to chromium, the commonly used alloy elements include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various applications for the organization and performance of stainless steel.
Stainless steel elbow requires a smooth appearance。 It is difficult to produce such a large bend with small and medium - sized corners。 The machining method commonly used in small and medium corners: casting method; After the separation of the body, the welding process of welding together; The method of welding together after cutting and cutting。 It is difficult or impossible to fabricate large stainless steel elbow。 Using casting method, the core is very difficult。 It is difficult to find such a large milling equipment by cutting machine, which is limited by equipment and processing technology。 It is difficult to make such large mould with pressing method, and the cost is very high。
The stainless steel elbow has the characteristics of very lively chemical performance, small thermal conductivity and large thermal capacity under high temperature. In the welding of stainless steel elbow, the welding seam is easy to be oxidized and polluted by air, which seriously affects the welding quality. For this purpose, the internal gas of the pipe must be used to solve the high temperature oxidation of the inner welds.
Stainless steel bend strength, toughness index is good in all kinds of steel, its outstanding advantage is corrosion resistant, in chemical industry, papermaking and other corrosive strong occasion must be used stainless steel, of course, the cost is also higher。