Grade 400 steel is a high-strength structural steel with a minimum yield strength of 400 MPa. It is commonly used in the construction, manufacturing, and automotive industries for structural components and machinery. Understanding its properties and applications is essential for selecting the right material for a specific project.

Mechanical Properties:
– Minimum Yield Strength: 400 MPa
– Tensile Strength: 520-670 MPa
– Elongation: 17-25%
– Hardness: Brinell hardness range of 119-162 HB
– Impact Toughness: 27 J at -20°C

Chemical Composition:
– Carbon: 0.20%-0.25%
– Manganese: 1.50%-2.00%
– Phosphorus: 0.045% max
– Sulfur: 0.045% max
– Silicon: 0.50% max

Grade 400 steel is commonly used in the construction industry for building structures, bridges, and machinery where high strength and durability are required. It is also used in the manufacturing of heavy equipment, mining machinery, and agricultural implements. Additionally, it is often utilized in the automotive industry for chassis and other structural components.

Overall, understanding the mechanical properties, chemical composition, and applications of Grade 400 steel is crucial for ensuring its proper use in various industries and applications. With its high strength, durability, and versatility, Grade 400 steel is a popular choice for a wide range of structural and mechanical applications.
Grade 400 Steel grade