The main alloying elements FSC specifications silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, rare earth alloy steel tube in addition to iron, carbon, and a small amount of non- Avoid than silicon, manganese, phosphorus, sulfur t91 steel, but also a certain amount of alloying elements t91 pipe, steel alloying elements silicon, manganese, molybdenum, nickel, Ge, alumina, titanium, niobium, boron, lead, rare earth in which one or several, each of the steel alloy called alloy systems, with their own resources, production and use vary conditions abroad in the past has been the development of nickel, steel Ge system, while China was found to silicon, manganese, vanadium, titanium, niobium, boron, lead, rare earth alloy-based systems accounted for about ten percent of steel production in the steel, and is generally in the smelting furnace in steel pipe can use divided into eight categories, which are: alloy structural steel, spring steel, bearing steel, alloy tool steel, high speed tool steel, stainless steel, heat-resistant steel can not afford leather, electrician has good formability silicon steel PC / ABS, machinability large automotive parts such as automobile fenders, there is a very high price in the ordinary carbon steel alloy steel pipe on the basis of one or more alloying elements to add the right amount and classification of iron-carbon alloy steel tube constituted: P91 steel points alloy tubes and welded steel pipe. 1.2 specification alloy pipe putting up get smaller size and better quality, seamless, must cold-rolled, cold drawn, or both combined. T91 usually imported cold rolled on a two-roll mill, steel pipe in the hole section becomes circular hole slot and does not move the cone head composed of rolling. Drawing is usually performed on the 0.5 ~ 100T single chain or double chain drawing machine. 1.3, the upcoming heating extrusion good squeeze tube placed in a sealed cylinder, piercing rod and rod movement squeeze together to make the extrusion die extrusion from the smaller hole. This method can produce smaller diameter steel pipe. t91 | Yichun t91 | Katherine source of steel provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Katherine source of innovative ideas will lead pipe and you work into the brilliant, for a better future!