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20MnCr5H low-carbon alloy structural steel
20MnCr5H is a carburizing structural steel with manganese and chromium as the core alloying elements. With its high strength, excellent wear resistance and good hardenability, it has become a key material in automobile manufacturing, engineering machinery, aerospace and other fields.
Mechanical properties of 20MnCr5H:
Tensile strength: 1100-1482 MPa (conventional heat treatment), up to 1700 MPa after carburizing;
Yield strength: 900-1232 MPa (retention rate ≥80% at high temperature of 400℃);
Elongation: 10%-13%, reduction of area ≥57%;
Impact toughness: 73 J/cm² impact energy at room temperature, retaining 60% toughness at -40℃;
Hardness: 220-250 HB in annealed state, surface hardness 58-62 HRC after carburizing and quenching, core hardness 30-35 HRC.
20MnCr5H Processing Properties:
Forging Properties: Good; can be hot-deformed within the temperature range of 850-1150℃.
Machinability: Annealed hardness HB≤197; easy to turn and mill.
Weldability: Preheating (150-200℃) is required to avoid cold cracking; stress relief treatment is necessary after welding.
Mechanical properties of 20MnCr5H:
Tensile strength: 1100-1482 MPa (conventional heat treatment), up to 1700 MPa after carburizing;
Yield strength: 900-1232 MPa (retention rate ≥80% at high temperature of 400℃);
Elongation: 10%-13%, reduction of area ≥57%;
Impact toughness: 73 J/cm² impact energy at room temperature, retaining 60% toughness at -40℃;
Hardness: 220-250 HB in annealed state, surface hardness 58-62 HRC after carburizing and quenching, core hardness 30-35 HRC.
20MnCr5H Processing Properties:
Forging Properties: Good; can be hot-deformed within the temperature range of 850-1150℃.
Machinability: Annealed hardness HB≤197; easy to turn and mill.
Weldability: Preheating (150-200℃) is required to avoid cold cracking; stress relief treatment is necessary after welding.
