Alloy steel pipe is a variety of steel pipes that use alloy material for the making. An alloy is a combination of elements along with ferritic material. The alloy is usually made up of different material such as Chromium, Nickel, Molybdenum, Niobium, Vanadium, Titanium and other elements. Phosphorus and Sulfur are also used to produce Alloy steel pipe where there is a need for acidic resistance. The proportion of composition makes up very different mechanical properties. All alloy materials have higher yield strength, higher corrosion resistance and higher tensile strength than the ordinary carbon steel.
Also, the addition of alloy materials reduces the carbon content. This allows a specific quality that is resistant to intergranular corrosion. The less carbon also means there is less carbide precipitation while welding. To reduce the welding and machining needs, the pipes could be produced as seamless alloy steel pipe types. These are very much smooth and are cold drawn where ERW pipes are hot rolled in general. The cold drawn and hot rolled pipes are both heat treated. They have different grading. The most used are P9, P11, P22 and P91. A335 P91 price differs with the standards, dimensions and applications. This is one of the grades used specifically in high temperature applications. This material is highly oxidation resistant under high temperatures. So when used with boilers, they do not react with the substance in the boiler. They also do not corrode easily. They can withstand the high temperature fluid flow under considerable pressure.