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The 45 steel grade, also known as 45# steel, is a medium carbon steel with good strength, toughness, and wear resistance. It is widely used in various industrial applications due to its excellent mechanical properties and chemical composition.

Mechanical Properties:
– Tensile Strength: 600-800 MPa
– Yield Strength: 355 MPa
– Elongation: 16%
– Hardness: 210 HB

The high tensile strength and good hardness of 45 steel make it suitable for use in manufacturing components and machinery parts that require high strength and wear resistance. Its good toughness and elongation also make it versatile for use in various applications.

Chemical Composition:
– Carbon: 0.42-0.50%
– Silicon: 0.17-0.37%
– Manganese: 0.50-0.80%
– Phosphorus: ≤0.035%
– Sulfur: ≤0.035%

The chemical composition of 45 steel contributes to its durability and versatility. The moderate carbon content provides good strength and hardness, while the presence of manganese helps improve its toughness and wear resistance. The low levels of phosphorus and sulfur also contribute to its good machinability and weldability.

Overall, the combination of excellent mechanical properties and a balanced chemical composition makes 45 steel grade a durable and versatile material for various industrial applications, including manufacturing of gears, shafts, and other mechanical components.
45 Steel grade
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