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20CrNi3MoA low-alloy structural steel

20CrNi3MoA low-alloy structural steel

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Standard: GB/T 3077

Description: 20CrNi3MoA low-alloy structural steel widely recognized in the metallurgical industry for its excellent mechanical properties and versatility. 20CrNi3MoA alloy steel is engineered for applications requiring superior toughness, wear resistance, and fatigue...

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20CrNi3MoA low-alloy structural steel widely recognized in the metallurgical industry for its excellent mechanical properties and versatility. 20CrNi3MoA alloy steel is engineered for applications requiring superior toughness, wear resistance, and fatigue strength. 20CrNi3MoA incorporates alloying elements such as chromium, nickel, and molybdenum, which enhance its performance under demanding conditions.

20CrNi3MoA alloy steel adheres to the Chinese national standard GB/T 3077,  GBT 20CrNi3MoA alloy steel is characterized by its balanced combination of strength and ductility, making it suitable for heavy-duty components. It undergoes heat treatment processes like quenching and tempering to achieve optimal hardness and toughness, ensuring reliability in high-stress environments.

Conventional Dimensions:
- Round bars: Diameter ranging from 10 mm to 300 mm.
- Flat bars: Thickness from 5 mm to 100 mm, width up to 500 mm.
- Plates: Thickness from 6 mm to 200 mm, width up to 2500 mm.
- Forgings: Custom sizes based on specific requirements.

Chemical Composition of 20CrNi3MoA alloy steel

The chemical composition of 20CrNi3MoA is critical to its performance.

Element C Si Mn Cr Ni Mo P S
Content (%) 0.17-0.23 0.17-0.37 0.30-0.60 0.60-0.95 2.75-3.25 0.20-0.30 ≤0.035 ≤0.035

Mechanical Properties of 20CrNi3MoA alloy steel

The mechanical properties of 20CrNi3MoA make it ideal for structural and mechanical applications.

Property Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Impact Toughness (J) Hardness (HB)
Value ≥980 ≥785 ≥9 ≥47 (at -20°C) ≤269

Equivalent Grades of 20CrNi3MoA alloy steel

20CrNi3MoA can be compared to international steel grades with similar compositions and properties.

Standard Grade
AISI/SAE (USA) 4340
EN (Europe) 36CrNiMo4
JIS (Japan) SNCM439

Applications of 20CrNi3MoA Alloy Steel

20CrNi3MoA alloy steel is extensively used in industries where components are subjected to high stress and dynamic loads. Its primary applications include:
- Manufacturing of heavy machinery parts such as crankshafts, gears, and shafts.
- Production of critical components in the automotive and aerospace sectors.
- Fabrication of high-strength fasteners and connecting rods.
- Use in energy equipment, including turbine blades and pressure vessel parts.

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