Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality stainless steel seamless pipe and nickel-nickel alloys. One of the products we mainly promote is alloy steel seamless pipe. Let us introduce it below:

Alloy steel is called alloy steel by adding other alloying elements in addition to iron and carbon. An iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements on the basis of ordinary carbon steel. According to the different added elements and adopting appropriate processing technology, special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and non-magnetic properties can be obtained.

Influence on the phase change during heating and cooling of steel:

The main solid phase transformation when steel is heated is the transformation from non-austenite phase to austenite phase, that is, austenitization process. The whole process is related to the diffusion of carbon. Among the alloying elements, non-carbide-forming elements reduce the activation energy of carbon in austenite and increase the rate of austenite formation; while strong carbide-forming elements strongly hinder the diffusion of carbon in steel and significantly slow down the austenitization process.

The phase transformation when steel is cooled refers to the decomposition of undercooled austenite, including pearlite transformation (eutectoid decomposition), bainite transformation and martensite transformation. Take only the influence of alloying elements on the isothermal transformation curve of undercooled austenite as an example. Most alloying elements, except cobalt and aluminum, all play a role in slowing down the isothermal decomposition of austenite, but various elements play a role. different. Those that do not form carbides (such as silicon, phosphorus, nickel, copper) and a small amount of carbide-forming elements (such as vanadium, titanium, molybdenum, tungsten), the transformation of austenite to pearlite and the transformation to bainite The difference in the impact of, so the transition curve shifts to the right.

If the content of carbide forming elements (such as vanadium, titanium, chromium, molybdenum, tungsten) is large, the transformation of austenite to pearlite will be significantly delayed, but the transformation of austenite to bainite will not be significantly delayed , So that the isothermal transition curves of these two transitions are separated from the "nose", forming two C shapes.

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