What is AISI 4130 Grade The AISI or SAE 4130 grade is a low-alloy steel with strengthening agents such as chromium and molybdenum. AISI 4130, is a chromium molybdenum alloy steel. The steel is good strength and rugged, as well as weldable and machinability. The AISI/SAE 4130 alloy is a flexible alloy with excellent atmospheric corrosion

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