Q345B Steel Coil

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Q345B Steel Coil

Q345B steel coil is a low carbon alloy steel, it has good comprehensive performance, low temperature performance, cold stamping property, and welding performance. It is widely used in bridges, vehicles, ships, buildings, pressure vessels and general metal parts.

The storage tank and container industry often uses these plates due to their resistance to corrosion, abrasion, impact, and fatigue. This article will cover some of the key characteristics of this material.


Q345B steel is a type of low-alloy high-strength structural carbon steel. Its strength makes it suitable for applications that require a high load-bearing capacity, such as bridges and buildings. It also has good toughness, which helps it withstand damage and absorb energy. Additionally, it has excellent weldability, allowing it to be easily fabricated into complex shapes and structures.

The Q345B steel plate is a Chinese standard low-alloy high-strength carbon structural steel grade with good corrosion resistance, weldability, cold forming and machinability. It has a density of 7.85 g/cm3, with tensile and yield strengths of 470-630 Mpa and 345 MPa, respectively. The steel is typically made from a combination of manganese, silicon, and phosphorus. Other trace elements may be included to provide specific properties based on the application.

The Q345C variant of this low-alloy steel is characterized by an increased carbon content. This improves its strength and provides greater resistance to dynamic loads, making it ideal for heavy machinery, transportation equipment, and offshore structures. The hot-rolled nature of this steel ensures its uniform thickness, flatness, and dimensional accuracy, allowing it to meet the requirements for many different applications. These qualities make it a popular choice for use in the construction of storage tanks and containers. It is also a common choice Q345B steel coil for building high-rise buildings and bridges. Its high strength and good toughness also make it an excellent material for manufacturing components such as anchor bolts, couplers, hooks, and nuts.

Corrosion Resistance

The corrosion resistance of Q345B steel is an important consideration when designing structures that must withstand extreme conditions. This type of steel is a low-alloy, medium tensile strength material that offers a good balance between formability and weldability. It also has good ductility and is able to resist torsional stresses. It is important to follow welding guidelines when using this material, as these can affect its strength and toughness. This includes proper shielding techniques and selecting compatible filler materials. In addition, post-weld heat treatments like stress relieving and tempering may be required to minimize residual stresses.

Corrosion resistance is determined by its yield strength, which is the maximum stress a material can endure before it begins to deform plastically. This property is important because it can prevent a structure from failing during operation. In general, higher yield strengths are more resistant to damage than lower ones.

In this study, the ductility of natural corroded Q345 and Q420 steels was evaluated in accordance with their mass loss rate. The engineering stress-strain curves of these two steels showed that the lengths of their linear elastic region, strain hardening region and necking region reduced as the mass loss rate increased.

The surface characteristics and tensile failure modes of the steel tubes with different mass loss rates are shown in Figure 12. In general, the noncorrosive specimens had silver-gray surfaces, while the corroded specimens were covered with reddish-orange rust. In addition, the corroded specimens were characterized by etch pits on their surfaces.


Q345B is a low carbon steel that can be used in various applications. Its strength, weldability, and corrosion resistance make it a popular choice for construction projects. It is also ideal for use in manufacturing projects, as it has excellent formability and welding properties.

Q345 is a type of steel that is used for metal construction that requires a high level of strength, such as oil tanks, automotives, and cranes. This steel can withstand low temperatures, and it is easy to weld. It is commonly used in buildings, bridges, and other large-scale structures.

It has a tensile strength of 470 to 630 mega Pascals, and its yield strength is 345 MPa. The yield strength is the stress point at which a steel will begin to deform plastically and then return to its original shape when the load is removed.

It has been shown that the cyclic fatigue behavior of dissimilar steel welded joints is affected by mechanical inhomogeneity in both the weld and HAZ. As the damage to the weld increases, the hardness of the HAZ decreases, indicating that the weld is not uniformly bonded with the base material. In addition, the elemental concentration gradient of the welded joint can be observed through EDS analysis. For example, the elemental distribution of Cr and Ni in the weld and HAZ is different, with the former being enriched in d-ferrite, and the latter being concentrated in austenite.


Q345B steel coil can be cold rolled into various shapes like profiles, pipes, and sheets. This allows them to be used in structural fabrication hot dipped galvanized steel coils applications and construction projects. They are also ideal for use in creating large welded structures like bridges, pressure vessels, and heavy machinery frames.

These plates have excellent resistance to corrosion, abrasion, and impact, making them perfect for use in storage tank and container construction. They are also able to withstand harsh chemicals and liquids, which means they can be used for the storage of a variety of different substances.

The Q345B steel plate has a high yield strength, meaning it is able to withstand large amounts of stress before it begins to deform plastically. It also has good weldability and formability, which makes it an ideal material for construction projects that require high load-bearing capacity.

The Q345B steel plate is a low-alloy high-strength steel that can be found in motor vehicles, bridges, ships, buildings, and pressure vessels. Its yield strength is 345 MPa, which is higher than that of Q235 steel. This difference is important because it indicates that Q345 steel can withstand greater stresses and heavier loads than Q235 steel, which makes it more suitable for use in construction projects. It is often used for beams and columns that will be exposed to a lot of pressure.

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