Q345 Alloy HSLA High Strength Low Alloy Steel 470 - 630 MPa Tensile Strength

Product Specification

Q345 Alloy Is A High-Strength Low-Alloy Steel With Excellent Weldability And Toughness.

Q345 Alloy is a high-strength low-alloy (HSLA) steel known for its superior mechanical properties and versatility, making it suitable for demanding structural applications. This steel grade is designed to provide enhanced strength, toughness, and weldability, while maintaining good formability and ductility.

Chemical Composition:

Q345 Alloy contains the following key elements:

• Carbon (C): 0.12-0.20% – Carbon content is carefully controlled to provide increased strength and hardness while maintaining good weldability and ductility.
• Manganese (Mn): 1.00-1.60% – Manganese enhances tensile strength and hardness, and also helps to improve the steel's toughness and resistance to wear.
• Silicon (Si): ≤0.50% – Silicon is included to aid in deoxidation during the steelmaking process, resulting in a cleaner steel with a smoother surface.
• Phosphorus (P): ≤0.045% – Low phosphorus content is maintained to avoid brittleness and ensure the material remains tough and ductile.
• Sulfur (S): ≤0.050% – Sulfur is kept at a low level to minimize inclusions and ensure better machinability and overall strength.

Mechanical Properties:

Q345 Alloy provides a strong combination of mechanical properties:

• Tensile Strength: 470-630 MPa – The high tensile strength of Q345 Alloy makes it suitable for applications requiring significant load-bearing capacity and structural integrity.
• Yield Strength: ≥345 MPa – This yield strength ensures that the alloy can withstand substantial stress without permanent deformation, making it reliable for structural uses.
• Elongation: ≥21% – The alloy's elongation indicates good ductility, allowing it to be stretched or formed without breaking, which is important for various fabrication processes.
• Density: Approximately 7.85 g/cm³ – Typical of low-alloy steels, providing a balanced ratio of strength to weight.
• Hardness: HRB 80-95 – The hardness range supports good wear resistance and machinability while retaining adequate flexibility and strength.

Applications:

Q345 Alloy's enhanced mechanical properties and chemical composition make it suitable for a wide range of applications:

• Construction: Used in the construction of buildings, bridges, and other infrastructure projects due to its high strength and good weldability. It is commonly used for structural beams, columns, and frames.
• Heavy Machinery: Ideal for components in heavy machinery and equipment where high strength and durability are required, such as in construction and mining equipment.
• Pipelines: Used in the manufacturing of pipelines for transporting oil, gas, and other fluids, where its strength and resistance to pressure are critical.
• Automotive Industry: Employed in the production of various automotive parts that require a combination of strength, durability, and formability.
• Metal Fabrication: Suitable for general metal fabrication applications, including the production of metal plates, sheets, and structural components.

Summary:

Q345 Alloy is a high-strength low-alloy steel designed to offer superior mechanical properties, including high tensile and yield strength, good ductility, and excellent weldability. Its balanced chemical composition and robust performance make it a versatile material for demanding structural and industrial applications, from construction and heavy machinery to pipelines and automotive components. Q345 Alloy provides reliable performance and durability, making it an excellent choice for projects requiring a strong, adaptable, and cost-effective steel solution.