Q345B Angle Steel

Q345B Angle Steel

Q345B angle steel is widely used in various building structures and engineering structures, such as bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks, power piping installation, and bus support installations. It has good comprehensive properties, low temperature performance and weldability.

The surface morphologies of the USPed and non-USPed samples are different, and serious corrosion appeared on the surfaces of the USPed samples after 7 d immersion test.

Mechanical Properties

Q345B carbon steel plates are able to endure heavy-duty stress and use for a long time before they begin to show signs of wear or failure. They are also known for their ability to resist corrosion and abrasion, making them well-suited for the fabrication and construction of tanks and containers that hold various liquids and gases.

These plates can also be used to construct buildings and infrastructure, as they are able to provide structural support while withstanding a wide range of conditions. They are often utilized in construction projects, such as bridges, and are also employed in the production of heavy-duty machinery and equipment for manufacturing purposes.

Compared to Q235 steel, the yield strength of Q345B is much higher. The yield strength measures how much force the steel can withstand before it begins to deform plastically and permanently. The stronger the yield strength, the more resistant the steel is to large stresses and heavy loads. The tensile strength of this grade is also higher than Q235, meaning that Low carbon alloy angle steel it can withstand greater levels of stress before failing. Lastly, this grade is weldable and has good cold and hot workability. It can be used in the construction of oil tanks, cranes and vehicles, and for other high-load welded structures.


The ductility of Q345B angle steel is determined by its ability to resist stress and pressure before it breaks or bends. Its ductility is higher than other types of structural steel, making it an ideal choice for buildings and structures that need to withstand high levels of pressure or stress without breaking or bending. Its ductility is also important because it allows the structure to be easily repaired in the event of an accident or natural disaster.

The steel is a low alloy and medium tensile strength material, which makes it an excellent choice for use in many different manufacturing applications. It contains less than 0.2 percent of carbon and several impurities, including silicon and sulfur. It is often used in the manufacture of sheet metal and other light structural elements for building construction. It is also commonly used in automotive classis and other industrial processes, where it can be easily cut, welded and machined.

Because angle steel is a very malleable metal, it can be fabricated into a wide variety of shapes and designs. For example, it can be shaped to create aesthetically pleasing framing components. It is also possible to add holes and other openings to the metal using various manufacturing techniques, including metal stamping or punching. This allows you to create a customized appearance that is perfect for your project.

Corrosion Resistance

Q345B angle steel is a low alloy steel with good comprehensive properties, low temperature performance, plasticity and weldability. It Multifunctional building structure carbon steel is widely used in bridges, vehicles, ships, buildings and pressure vessels, etc.

The corrosion resistance of Q345B is excellent due to the high chromium content, which makes it more resistant to chemical attacks than lower grade steels. Additionally, its ductility allows it to be shaped and fabricated for different uses. It can also be welded easily, which is especially important in areas with harsh environments, such as marine applications.

In this study, we investigated the effects of ultrasonic shot peening on the surface morphology and corrosion resistance of Q345B steel. Through the adjustment of USP process parameters, such as power, time and distance, we found that the surface morphology and roughness of the samples changed significantly. Additionally, the microhardness and corrosion resistance of the samples increased with increasing USP time and distance.

After repair welding, the tensile strength of the R1 weld didn’t decrease significantly, and its fatigue limit was similar to that of the base material. The corrosion resistance of the R1 weld was better than that of the BMQ345B weld, which was related to its finer grain size and d-ferrite morphology. The Ecorr value of the R1 weld was less negative than that of the BMQ345B, which indicated a more favorable thermodynamic tendency [32]. This was also related to its smaller Icorr value, which indicated a more electrochemically active tendency.


Q345B is a low carbon structural steel with good welding performance. It is used for metal components and frame of factory buildings. It has excellent plastic deformation performance and certain mechanical strength. It is also easy to process and weld. The weldability of angle steel is improved by using nickel alloy welding rods.

Moreover, the corrosion resistance of angle steel welds can be significantly enhanced through the addition of chromium and nickel. The corrosion test results show that the welds with a higher nickel content had better corrosion resistance than those with a lower nickel content. The corrosion resistance of the welds was related to the microstructure and the diffusion behavior of elements. The welds with a coarser microstructure and a more disperse d-ferrite morphology were less resistant to corrosion.

During the experiment, the tensile tests of the weld-strengthened angle steel members revealed that they exhibited better ductility and higher bearing capacity than the unstrengthened ones. The failure mode of the weld-strengthened specimens was dominated by flexural yielding. However, the variation of initial load values had a significant influence on lateral torsion buckling but had little effect on failure dominated by flexural buckling. Therefore, the selection of suitable initial load values for the weld-strengthened angles steel members is an important issue to be considered. Besides experimental study, parametric analysis was carried out on the FE models to further understand the effect of the section types, slenderness ratios and welding filler characteristics on the mechanical behavior of the weld-strengthened members.