Q345 Carbon Steel Square Steel
Q345 carbon steel square steel is a type of low alloy high strength structural steel. It has a high yield strength and good weldability. It is also very durable and cost-effective.
It can be used in building structures, low pressure vessels, cranes and mechanical parts. However, it is difficult to weld, so strict welding process measures must be adopted.
Characteristics
Q345 carbon steel square steel is a low alloy, high strength structural steel. The ‘Q’ in the grade stands for yield, while the latter refers to its strength, which is 345 MPa. This strength level is the minimum at which the material can be deformed plastically and still return to its original shape when stress is removed. The yield value decreases as the thickness of the material increases.
This steel is used for medium and low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, and other structures that bear dynamic load. It has good comprehensive mechanical properties, low temperature performance, and excellent plasticity and weldability. It is also capable of sustaining long-term exposure to cold areas below -40 degrees Celsius.
Unlike some other structural materials, Q345 has a relatively low corrosion rate, making it ideal for most industrial applications. It can be welded easily, and its high tensile strength rating means that it can withstand significant stress without failing. Additionally, it has good ductility and toughness, which makes it ideal for use in dynamic applications. It is also cost-effective, and can be easily fabricated into complex shapes. It is most commonly used in the construction and energy industries, but can also be found in transportation and other infrastructure projects. It is also suitable for shipbuilding applications, due to its high strength and resistance to marine environments.
Applications
Q345 is a low alloy steel grade with good comprehensive mechanical properties, Q345 carbon steel square steel and excellent low temperature performance, plasticity and weldability. It is widely used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, Bridges under moving load of the structure and mechanical parts, building structure and general metal parts. It can be delivered in hot rolled or normalizing state and can be used in below -40 cold regions.
As the name indicates, this is a Chinese standardized steel with a low yield point of 345 MPa and a tensile strength of 470-630 MPa. This is considered a ‘general purpose’ manufacturing steel and is used for sheet metal and similar applications where the material won’t be stressed too heavily.
Construction: Q345 is commonly used in a variety of bridges, skyscrapers and other infrastructure projects because it can be welded easily. It is also utilized in the manufacturing industry for fabricating machinery and equipment due to its durability. The strength of this steel also makes it ideal for use in a variety of automotive applications, such as chassis components and frames. The welding process for this type of steel is comparatively simple, and it can be welded using manual arc welding or electric resistance welding. It is important to follow strict welding process measures during construction to prevent cracking after the welds have been cooled.
Mechanical Properties
Q345 is a low alloy steel, used in applications where strength is required but corrosion resistance isn’t a priority. It is also known as GB/T 1591 and is commonly found in bridges, vehicles, ships, construction, and pressure vessels. This type of steel has a higher tensile strength than other steels, and it is easy to work with and weld.
The mechanical properties of this type of steel are highly dependent on the temperature and the environment in Industrial carbon steel angle steel which they are tested. For example, the yield strength of steel decreases as the temperature increases, and it will begin to deform plastically before reaching its ultimate strength. The tensile strength of Q345 is rated at 470 to 660 mega Pascals, meaning it can withstand heavy stresses before failing.
In order to investigate the effect of corrosion on the mechanical properties of Q345 carbon steel square steel, tensile tests were performed on samples with different mass loss rates. The results showed that the corroded steel had a lower yield strength than the uncorroded sample, and the length of the linear elastic region, strain hardening region, and necking region decreased as the mass loss rate increased. In addition, the engineering stress-strain curves for these samples were close to the true stress-strain curves. This indicates that the method proposed in this study is able to accurately determine the true stress-strain curve of corroded steel.
Welding Properties
Q345 carbon steel square steel is a type of Chinese standardized low-alloy, medium tensile strength steel made with a hot-rolling process. This material is used for a variety of manufacturing purposes. It has good low temperature performance and welding properties, and can withstand heavy stress before failing. It also has good machinability and can be used for cold stamping.
In addition, Q345 carbon steel square steel has excellent weldability due to its good workability and ductility. However, it is not suitable for use in environments with high temperatures and acidic corrosion. In this case, the weldability of this material can be improved by adding a small amount of V, Ti, and Nb alloy elements.
Moreover, when welding this type of steel, it is necessary to formulate strict process measures to prevent cracking. This is because the weldability of this steel is affected by its chemical composition and temperature conditions. In particular, its weldability is poor when the CEQ value of the heat-affected zone is over 0.49%.
In this study, mechanical degradation of both Q345 weathering steel and carbon steel plate caused by strong acid corrosion was investigated. Twenty-seven specimens of both materials were immersed in a 36% industrial hydrochloric acid solution for different corrosion times, and their surface morphology and mechanical properties were monitored. Corrosion dynamic curves and stress-strain curves were analyzed. In addition, a secondary yield degradation model of the corroded steel was established.
