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Alloy Steel 4112

Alloy steel 4112 is an iron-carbon alloy composed of molybdenum and carbon. The molybdenum inhibits grain growth and helps to limit embrittlement. The first digit, 4, defines molybdenum as the primary element. The second digit, 1, defines the approximate percentage of the primary element (1% molybdenum), and the last two digits, 12, define the percentage of carbon in hundredths of a percent (0.12% carbon).