8620 Steel Properties: Composition, Hardness, and Uses 8620 (AISI/SAE 8620) is a low-carbon nickel-chromium-molybdenum alloy steel made for case hardening by carburizing. It is one of the most widely used carburizing grades, chosen for gears, shafts, pins, and other parts that need a hard, wear-resistant surface over a tough, ductile core. In Chinese standards, it […]
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Case Hardening Steel: Process, Grades, and When to Use It What Is Case Hardening? Case hardening is a group of surface treatments that produce a hard, wear-resistant outer layer (the “case”) over a tough, ductile core. The most common method is carburizing, which diffuses carbon into the surface of low-carbon steel. The related diffusion methods
4340 Steel Properties 4340 is a medium-carbon nickel-chromium-molybdenum alloy steel (AISI/SAE 4340). It belongs to the ultra-high-strength structural steels and is valued for deep hardenability, high toughness at high strength, and strong fatigue performance. Typical uses are aircraft landing gear, heavy-duty shafts and axles, gears, crankshafts, and other parts that carry high stress in thick
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4140 Steel: Properties, Hardness, and Heat Treatment What Is 4140 Steel? 4140 is a medium-carbon chromium-molybdenum alloy steel (AISI/SAE 4140) and one of the most widely used engineering steels. Roughly 0.40% carbon, 1% chromium, and 0.2% molybdenum give it a strong balance of strength, toughness, and hardenability, allowing a single grade to cover a wide
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