Material
Alloy Steel
Alloy steel is engineered with controlled additions of elements such as chromium, molybdenum, nickel, and manganese to achieve specific mechanical properties. It is commonly selected for precision shafts, gears, high-load components, tooling, and industrial parts requiring improved strength, hardenability, fatigue resistance, or wear performance.
Material overview
Alloy steels provide a broad range of mechanical properties through chemical composition and controlled heat treatment. They are particularly useful in applications where conventional carbon steel does not provide sufficient strength, toughness, fatigue life, or wear resistance.
Common grades include:
- 4140 / 42CrMo4: A chromium-molybdenum alloy steel commonly used for shafts, gears, machine components, and high-strength mechanical parts.
- 4340 / 34CrNiMo6: A nickel-chromium-molybdenum steel selected for demanding applications requiring high strength and toughness.
- 8620 / 20NiCrMo2-2: A carburizing steel used for gears, pinions, and components requiring a hard surface with a tougher core.
- 16MnCr5: Frequently used for case-hardened transmission and mechanical drive components.
- 52100 / 100Cr6: A high-carbon chromium steel commonly used in bearings and wear-resistant precision components.
Manufacturing processes include CNC turning, milling, gear cutting, grinding, forging, and heat treatment. Machining strategy depends on the material's supplied condition, hardness, and final mechanical requirements.
Heat treatment may involve annealing, normalizing, quenching and tempering, carburizing, induction hardening, or nitriding. Buyers should specify the required hardness range, case depth, and inspection method when these characteristics are critical.
RFQ documentation should identify the exact material grade and standard, supply condition, required heat treatment, mechanical properties, dimensional tolerances, surface finish, and inspection requirements. Material traceability, hardness testing, and inspection certificates may be necessary for critical components.
Typical applications include power transmission systems, heavy machinery, automotive drivetrains, hydraulic equipment, and industrial mechanical assemblies.