What Is Steel Yield Strength?

Yield strength is the yield limit when a metal material experiences a yield phenomenon, that is, the stress that resists a small amount of plastic deformation. For metal materials with no obvious yield phenomenon, the stress value that produces 0.2% residual deformation is specified as its yield limit, which is called the conditional yield limit or yield strength.

Yield strength: It is the yield limit when a metal material experiences a yield phenomenon, that is, it resists a trace amount.

(1) Yinwen yields: Silver streaks and whitish stress.

(2) Shear yield.

Metal materials without obvious yield phenomena need to measure their specified non-proportional extension strength or specified residual elongation stress, while metal materials with obvious yield phenomena can measure their yield strength, upper yield strength, and lower yield strength. Generally, only the lower yield strength is measured.

There are generally two methods for determining the upper and lower yield strengths: graphic method and pointer method.

There are three commonly used yield standards in construction projects:

1,

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The traditional strength design method, for plastic materials, with yield strength as the standard, the allowable stress [] = _ys / n, the safety factor n can be from 1.1 to 2 or greater depending on the occasion. For brittle materials, to resist The tensile strength is a standard, and the allowable stress [] = _b / n is specified, and the safety factor n is generally taken to be 6.

It should be noted that according to the traditional strength design method, the high yield strength of the material will inevitably be pursued unilaterally, but as the yield strength of the material increases, the brittle fracture strength of the material decreases, and the risk of brittle fracture of the material increases.

Yield strength not only has a direct meaning of use, but also an approximate measure of some mechanical behavior and process performance of materials in engineering. For example, if the material's yield strength is increased, it is sensitive to stress corrosion and hydrogen embrittlement; if the material's yield strength is low, cold forming properties and welding properties are good. Therefore, yield strength is an indispensable important index in material properties.