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Are C40 and 40Cr the same material?

C40 is a type of carbon structural steel with medium mechanical properties and is often used to manufacture mechanical parts and machine tool parts. Its main components are carbon and manganese. The carbon content is about 0.37-0.44%, the manganese content is about 0.50-0.80%, and it also contains a small amount of sulfur, phosphorus and other elements. 40Cr is an alloy structural steel containing chromium, which has high hardness and strength and is often used to manufacture high-strength mechanical parts and cutting tools. Its main components are carbon, chromium, manganese and silicon, among which the chromium content is between 0.80-1.10%, the manganese content is between 0.60-0.90%, and the carbon content is between 0.37-0.44%.

As can be seen from the above comparison, C40 steel and 40Cr steel have differences in elemental composition and uses, so they are not the same material.