Q345B Steel
Q345B steel is a low alloy carbon steel with good comprehensive mechanical properties, low temperature performance and good plasticity. It can be used for various structures in cold areas.
The tensile strength of a material is the amount of tensile stress it can withstand before it fails, such as breaking. The higher the tensile strength, the stronger the material.
Corrosion Resistance
Q345B is a low alloy steel, which has high strength, good low temperature performance and good weldability. It is widely used in bridges, vehicles, cranes and other metal structures. Its gold content is lower than that of Q235, so it has good corrosion resistance.
The corrosion resistance of Q345B can be improved by shot peening. This method uses ultrasonic waves to make the surface of the steel smoother, which increases its resistance against corrosion. However, the effect of different USP parameters on corrosion resistance remains unclear. This study aims to investigate the influence of different USP parameters on the corrosion behavior of Q345B steel.
Several samples of Q345B steel were exposed to 3.5 wt.% NaCl solution for 3 and 7 days. The results showed that the corroded surfaces of the un-USPed samples were rougher and exhibited more serious exfoliation corrosion than those of the USPed ones. The abrasive traces left by 80# sandpaper on the corroded surface of the un-USPed sample were also found to be more severe.
The tensile strength of Q345B is 470 to 630 mega Pascals (where mega is million). The yield strength of this steel is around 345 mega Pascals. It has good elongation strength, meaning that it can stretch very far before breaking. It also has a good Brinell hardness rating, which is a measure of the hardness of a material through the penetration of an indenter into its surface.
Tensile Strength
Q345B steel has a higher tensile strength than other grades of carbon steel, making it a better choice for applications where strength is critical. It also has a lower melting point and a faster rate of forming, which makes it an ideal choice for hot forming and welding.
The tensile strength of a material is the maximum stress that it can bear before it fails. It is measured in megaPascals (MPa). The yield strength of a Q345B steel material is the lowest stress that it can sustain before failing, which is typically recorded at a percentage of the material’s original length. The elongation of a material is the distance that it travels before pulling apart, which is typically measured at 20-21 percent of its initial length.
The present study investigates the residual mechanical properties of Q345 structural steel after pre-fatigue damage. Structural specimens were subjected to cyclic loading cycles without causing fracture at three different pre-fatigue load levels. The resulting stress-strain curves and related parameters were determined. The results indicate that the nominal tensile strength and ultimate strength of the corrosion-damaged specimens are significantly less than that of the uncorroded ones. A stochastic numerical analysis was conducted to reveal the relationship between the nominal tensile stress and pitting corrosion. A highly accurate method for predicting the nominal tensile strength of corrosion-damaged steel components was proposed.
Elongation
Steel elongation is the measure of how far a material can be stretched before it fails, such as breaking. It is a property of the material that depends on both its h beam factory yield strength and its tensile strength, which are measured in Mega Pascals. The tensile strength of Q345B is rated at 345 Mega Pascals. The elongation of this steel is about 20-21 percent of its initial length.
Steel plates with this tensile and impact strengths are commonly used in construction, transportation, energy, and manufacturing. They are also known for their resistance to corrosion and harsh environments. They can be found in storage tanks, containers, and bridges. They also play a role in power generation equipment, like wind turbines and generators.
The allowable stress of 16 Mn and Q345 steel is different, so it is important to take this into consideration when designing a structure. To make sure that the design is safe, it is best to use a software program that calculates the allowable stress for each specific thickness of steel.
The SEM micro-morphology characteristics of Q345B steel after 7 days in 3.5 wt% NaCl solution are shown in Figure 15. As the USP distance decreased, the penetration intensity increased, and more cracks appeared on the surface. In addition, the ferrite area on the deformed layer had higher carbon content than that of the substrate.
Impact Strength
Q345B steel plates are often used for the fabrication of storage tanks and containers for storing chemicals, liquids, gases, petrochemicals, or other fluids. They are highly resistant to corrosion, abrasion, and impact, and can be easily formed into various shapes and sizes. They are also hot-rolled, which ensures uniform thickness, flatness, and dimensional accuracy.
The yield strength of Q345B is 345 megaPascals, which means it can handle a lot of stress before it breaks. It will also endure a certain amount of elongation before it pulls apart, which is typically around 20-21 percent of its initial length.
In this study, the residual mechanical properties of Q345B structural steel damaged by pre-fatigue loading were investigated using tensile tests. The samples were soaked in 3.5 wt.% NaCl solution for 3 and 7 days to examine their corrosion behavior. Surface morphologies and roughness characteristics were determined by scanning electron microscopy (SEM), energy dispersive analysis (EDS), a roughness tester, and a microhardness tester.
The tensile strength of Q345B is higher than that of other similar types of steel, including low-pressure vessels and oil tanks. It is also commonly used in bridges, vehicles, cranes, mining machinery, power stations, and other metal structures that bear dynamic loads. Its low temperature performance and good plasticity and weldability make it an ideal material for cold regions.
