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The numbers in 4140 typically refer to a type of alloy steel known as AISI 4140. This designation indicates that the steel contains approximately 0.40% carbon, along with chromium and molybdenum as alloying elements. AISI 4140 is known for its high strength, toughness, and wear resistance, making it suitable for a variety of applications, including machinery and automotive components. The numbers help categorize and specify the material's composition and properties.

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1w ago

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