Q345qD High Strength Low Alloy Steel

Q345qD is a kind of low alloy high strength structural steel, belongs to Q345 series steel, its chemical composition and mechanical properties meet the requirements of GB/T 1591-2018 standard and JB/T 4730-2005 standard. The main features of Q345qD steel are high strength, good toughness, good wear resistance and good weldability. The steel is commonly used in bridges, ships, mining equipment and other fields.

Q345qD is a kind of low-alloy high-strength structural steel used in bridge construction, its characteristics include the following aspects:

1. High strength: Q345qD has high tensile strength and yield strength, which can withstand large amounts of load and deformation to ensure the safety and stability of bridges.
2. Good toughness: Q345qD steel has good toughness and impact toughness, which can be used in strong earthquakes, wind, snow, ice and other natural environmental conditions.

3. Good welding performance: Q345qD steel has good welding performance and can be welded by conventional welding methods.

4. Good corrosion resistance: Q345qD steel has good corrosion resistance and can be used in harsh environments such as humidity and acid rain for a long time.

The main parameters of Q345qD steel include the following:

1. Chemical composition: C ≤ 0.18, Si ≤ 0.50, Mn: 1.20 ~ 1.60, P ≤ 0.030, S ≤ 0.030, Nb ≤ 0.07, V ≤ 0.15, Ti ≤ 0.020, Al ≥ 0.015.

2. Mechanical properties: Tensile strength ≥ 490MPa, yield strength ≥ 345MPa, elongation ≥ 21. 345MPa, elongation ≥ 21%, shrinkage ≥ 70%.

3. Special properties: Q345qD steel has good welding properties and processing properties, can meet the requirements of bridge construction.

Q345qD is suitable for a variety of bridge construction fields, including the following:

1. Highway bridges: Q345qD steel can be used for the manufacture of highway bridges, such as suspension bridges, cable-stayed bridges, arch bridges, steel truss bridges and other components.

2. Railroad bridges: Q345qD steel can be used for the manufacture of railroad bridges, such as steel truss bridges, steel truss bridges, steel box bridges and other components.

3. Building structure: Q345qD steel can be used to manufacture load-bearing elements of building structure, such as beams, columns, trapezoidal beams of large-span factory buildings, etc.

4. Shipbuilding: Q345qD steel can be used to manufacture parts of ship hull structure, such as hull skeleton, ship deck, etc.

Our main products are stainless steel plate/sheet, coil, round/square tube, bar, nickel alloy and so on. Factory test certification is provided at the time of shipment, and third-party inspection is possible. We are also certified by ISO, SGS and Alibaba. We have many professionals, technicians, more competitive prices than other stainless steel companies and the best after-sales service. And exports to more than 50 countries, mainly from the United States, Russia, the United Kingdom, Kuwait, Egypt, Turkey, Jordan, India and so on.

When using Q345qD steel, you need to pay attention to the following problems:

1. Welding: Q345qD steel has good welding performance, but in the welding process, you need to pay attention to the selection of suitable welding materials and technology to avoid cracks and deformation.

2. Cutting: Due to the high hardness of Q345qD steel, you need to use the appropriate equipment and technology when cutting to avoid cracks and deformation.

3. Rust prevention treatment: Q345qD steel needs to pay attention to prevent rusting in the process of use, which can be protected by coating, rust-proof oil and other means.

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