20CrNiMo, 40CrNiMo use
Chromium-nickel molybdenum alloy steel, commonly called Cr-Ni-Mo steel, is a alloy steel used in the production of components that require high levels of strength, such as shafts, gears, screws and nuts. Cr-Ni-Mo steel is typically composed of around 80% iron, 17% chromium (Cr), 6-7% nickel (Ni) a......