The index directly reflecting the toughness of steel is the ability to absorb plastic deformation work and fracture work under impact load, and its measuring index is impact toughness value. The content of nickel and carbon in steel will directly affect the toughness of steel.

The impact toughness of steel is an index to measure the quality of steel, especially for components that often bear load impact, such as heavyweight crane beams, which need to be identified by impact toughness. The greater the impact toughness, the better the impact toughness of steel.

Extended data

The pendulum impact bending test is often used in engineering to measure the ability of materials to resist impact load, that is, to measure the impact work ak consumed by the fracture of impact load samples, and the unit is Joule (J). Generally, materials with low ak value are called brittle materials, and materials with high ak value are called ductile materials.

Carbon content has an effect on the ductile-brittle transition curve of steel. With the increase of carbon content in steel, the cold-brittle transition temperature increases almost linearly, and the maximum impact value also drops sharply. When the carbon content of steel increases by 0. 1%, the cold-brittle transition temperature increases by about 13.9 degrees. The influence of carbon content in steel is mainly attributed to pearlite increasing the brittleness of steel.

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