SCM440 / AISI 4140 / 42CrMo4 Alloy Steel Guide: Properties, Hardness, Heat Treatment, Machining Applications
SCM440, also known as AISI 4140 or 42CrMo4, is a chromium molybdenum alloy steel widely used in automotive, machinery, and plant industries. Learn about its chemical composition, mechanical properties, hardness, heat-treatment processes, machining conditions, and real-world applications, with insights into Belinker Manufacturing’s machining expertise.