The role of chromium in alloy steel


In structural and tool steels, chromium increases strength, hardness and wear resistance significantly, but reduces plasticity and toughness at the same time.

Chromium can also improve the oxidation resistance and corrosion resistance of steel, so it is an important alloy element in stainless steel, heat resistant steel.

Chromium in permeable steel has a strong increase in the carbon content of the permeable layer, while chromium can also improve the hardenability of permeable steel, in the carburizing steel content is generally less than 2%, in tempered steel chromium is to improve the hardenability of the main element, can refine the grain, improve the temper resistance, but also increase the sensitivity of the second temper brittleness.


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