The thermal stability of steel

The thermal stability  of steel 

A, the oxidation resistance and improve the way of steel

Workpiece surface when in contact with high temperature air, steam or gas to high temperature oxidation or corrosion damage. Therefore, requirements artifacts must have good thermal stability. In addition to adding alloy element method, it is using metal seeping method, such as Cr, Al or perjmeability Si, in order to improve the oxidation resistance of the steel.

Second, the thermal stability of steel

Thermal stability of steel (also known as antioxidant steel) is widely used in industrial boilers, components, such as furnace bottom, muffle furnace, radiant tube, etc., the use of thermal stability of steel has the thermal stability of ferrite (F) type steel and austenite (A) two types, the thermal stability of steel. F type thermal stability of steel was conducted on the basis of F stainless steel oxidation alloying steel grade, which formed a single-phase F matrix, the surface easy to earn a continuous protective oxide film. According to the temperature, can be divided into Cr13 steel, Cr18 sections and Cr25 steel, etc. F type thermal stability of steel and stainless steel as F, because there is no phase change, so the grain is relatively bulky, toughness is low, but the strong oxidation resistance. Is A type of thermal stability of steel in A stainless steel on the basis of further by Si and Al antioxidant alloying of steel grade. A type of thermal stability of steel steel has better thermal stability than F process performance and heat intensity. But this kind of steel for resources consume large amounts of Cr, Ni, so the research from the '50 s Fe - Al - Mn and Cr - Mn - N series thermal stability of steel to replace, and has made a certain progress.

2 metal heat intensity

A metal material mechanical properties, high temperature characteristics

At room temperature, the mechanical properties of steel has nothing to do with the loading time, but the strength and deformation of steel at high temperature is not only related to time, but also related to the temperature, the heat resistant steel is the so-called hot strong sex. Hot strong sex refers to the heat resistant steel in high temperature and load resistance under plastic deformation and the ability to break bad. Thus it can be seen in the evaluation of high temperature under the condition of material mechanical properties, must be assessed with hot strong sex. Hot strong transient performance include material under the condition of high temperature and long time performance. Transient performance refers to the mechanical experiment under the condition of high temperature is often measured by the performance index. Such as high temperature tensile and impact and high temperature hardness in high temperature. Is characterized by high temperature, short time load, transient performance is generally strong steel hot sex of a profile, measured by the performance index a, do not make design index, but as to choose a reference index of high temperature materials. Long time performance refers to the material under high temperature and load together for a long time under the action of performance, measured by the common performance indicators are: creep limit high temperature fatigue strength, rupture strength, stress relaxation and cold and hot fatigue, etc.

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