Mechanical properties of stainless steel tubes

(a) strength (tensile strength, yield strength) the strength of stainless steel is uncertain by various factors, but the most important and the most basic factor is the addition of different chemical factors, mainly metal elements. Different types of stainless steel have different strength characteristics due to differences in their chemical composition.

(2) Creep strength

The phenomenon of deformation due to the action of external force with the increase of time is called creep. At a certain temperature, especially at high temperature, the larger the load is, the faster the creep occurs. Under a certain load, the higher the temperature and the longer the time, the greater the possibility of creep. On the contrary, the lower the temperature, the slower the creep rate, and the creep is not a problem at a certain temperature. The lowest temperature varies according to the type of steel. Generally speaking, pure iron is about 330℃, and stainless steel is strengthened because it has taken various measures, so the temperature is above 550℃.

As with other steels, melting method, deoxidation method, solidification method, heat treatment and processing have great influence on creep properties of stainless steels. It IS REPORTED THAT THE CREEP strength test of 18-8 stainless steel carried out in the United States shows that the standard deviation of the creep fracture time of the test material taken from the same ingot and the same part is about 11% of the average value, while the standard deviation of the test material taken from the different parts of the ingot and the average value is twice as much. According to the test results carried out in Germany, the strength of 0Cr18Ni11Nb steel is less than 49MPa to 118MPa at the 5 power h time of 10, and the dispersion is very large.

(3) Fatigue strength

High temperature fatigue refers to the process of material damage to fracture due to cyclic stress at high temperature. The RESULTS SHOW THAT THE HIGH TEMPERATURE FATIGUE STRENGTH OF 10 TO THE EIGHTH POWER IS 1/2 OF THE HIGH TEMPERATURE TENSILE strength at A certain high temperature.

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