20NiCrMo2H Gear Steel Bar
20NiCrMo2H gear steel bar is a type of alloy steel commonly used in the manufacturing of gears and other mechanical components that require high strength, toughness, and wear resistance. Here are the details of its standards, chemical composition, and mechanical properties: Standards • It...
Description
20NiCrMo2H gear steel bar is a type of alloy steel commonly used in the manufacturing of gears and other mechanical components that require high strength, toughness, and wear resistance. Here are the details of its standards, chemical composition, and mechanical properties:
Standards
• It typically adheres to standards such as EN 10084-2008, which defines the technical delivery conditions for case hardening steels.
Chemical Composition
• Carbon (C): The carbon content is usually in the range of 0.17% to 0.23%.
• Silicon (Si): Generally, the silicon content is up to 0.40%.
• Manganese (Mn): Manganese is present in an amount ranging from 0.65% to 0.95%.
• Sulfur (S): The sulfur content is limited to a maximum of 0.035%.
• Phosphorus (P): Phosphorus content is also restricted to a maximum of 0.035%.
• Chromium (Cr): Chromium is included in the range of 0.35% to 0.70%.
• Nickel (Ni): Nickel content is typically from 0.40% to 0.70%.
• Molybdenum (Mo): Molybdenum is present in an amount of 0.15% to 0.30%.
Mechanical Properties
• Tensile Strength: The tensile strength is generally greater than or equal to 1176 MPa (120 kgf/mm²).
• Yield Strength: The yield strength is greater than or equal to 590 MPa.
• Elongation: The elongation after fracture is typically greater than or equal to 9%.
• Reduction of Area: The reduction in area is usually greater than or equal to 40%.
• Impact Toughness: The impact toughness value is greater than or equal to 78 J/cm² (8 kgf·m/cm²).
• Hardness: The hardness in the delivery state is less than or equal to 197 HBW.
The specific values of these properties may vary depending on factors such as the manufacturing process, heat treatment, and quality control of the steel. Additionally, different standards or specifications may have slightly different requirements for the chemical composition and mechanical properties of 20NiCrMo2H gear steel bar. It is important to refer to the relevant standards and material specifications for accurate and detailed information.
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