Calculation of the hottest carbon equivalent and c

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Calculation of carbon equivalent and carbon equivalent in carbon steel

the content of alloy elements (including carbon) in steel is replaced by the equivalent content of carbon according to its function, which is called the carbon equivalent of this kind of steel, and can be used as a reference index for evaluating the weldability of steel

in addition to C, the elements in carbon steel are mainly Mn and Si. Many of their enterprises can increase the content according to the needs of the project, and the weldability becomes worse, but their effect is not as strong as that of carbon. The carbon equivalent formula recommended by the international welding society is

mn cu+ni cr+mo+v

ce (IIW) = C + - + - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (mass fraction) (%)


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with the increase of carbon equivalent value, the weldability of steel will become worse. When the CE value is greater than 0.4% - 0.6%, the sensitivity of cold cracks will increase. A series of technological measures such as preheating, post heating and welding with materials that can rebound more energy when applying force with low hydrogen type welding materials need to be taken during welding

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