Q345 Steel Plate

Q345 Steel Plate, also known as Q345 steel plate, belongs to the category of low-alloy steel. Its carbon content is less than 0.2%. The core identifier "Q" represents the yield strength, and the number "345" indicates that the lower limit of the yield strength for this material is 345 MPa. Moreover, the yield value will decrease as the thickness of the plate increases. Sanhe Steel, as an actual manufacturer, supplies Q345 steel plates strictly in accordance with industry standards, precisely controlling the chemical composition and mechanical parameters. Compared to ordinary carbon steel, it has a higher alloy content and superior comprehensive performance, which can meet the strict requirements for steel safety performance in industrial and commercial fields. It is the preferred steel for various load-bearing and low-temperature resistant scenarios.

Core performance advantages

The Q345 Steel Plate boasts multiple core performance advantages, making it suitable for use in various complex scenarios. Firstly, it has excellent comprehensive mechanical properties, featuring high strength, good plasticity and welding performance, allowing for flexible processing and meeting the production requirements of different structural components; Secondly, it has outstanding corrosion resistance and low-temperature toughness, suitable for use in cold regions below -40°C. It can maintain stable performance even in low-temperature environments and is not prone to damage; Thirdly, it has a wide range of applications. It can be used as structural components for medium and low-pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, etc., which are subjected to dynamic loads. It is used in a hot-rolled or normalized state, and its practicality is extremely strong.

Grade Classification and Differences

Q345 can be classified into Q345A, Q345B, Q345C, Q345D, and Q345E according to grades. The core differences among different grades lie in the varying impact temperatures, and the corresponding impact values also differ.

Grade Q345A does not undergo impact testing;

Grade Q345B undergoes impact testing at 20 degrees Celsius;

Grade Q345C undergoes impact testing at 0 degrees Celsius;

Grade Q345D undergoes impact testing at -20 degrees Celsius;

Grade Q345E undergoes impact testing at -40 degrees Celsius.

Sanhe Steel can precisely match the corresponding grade of Q345 steel plates according to the customer's usage environment (especially the requirements for low-temperature scenarios), ensuring product compatibility.

The differences and correlations between Q345 steel and 16Mn steel

Q345 steel is not a simple replacement for 16Mn steel. Instead, it is a comprehensive substitute product for multiple steel types such as 12MnV, 14MnNb, 18Nb, 16MnRE, and 16Mn. There are differences in their chemical compositions. Compared to 16Mn steel, Q345 steel has added three trace alloy elements: V, Ti, and Nb. These trace elements can refine the grain structure, enhance the toughness of the steel, significantly improve the comprehensive mechanical properties of the steel plate, and allow for thicker steel plates. Moreover, the thickness group size divisions of both are significantly different when classified by yield strength. The allowable stress of 16Mn steel cannot be directly applied to Q345 steel. The allowable stress needs to be re-determined based on the thickness group size of Q345 steel, and the allowable stress of Q345 steel is slightly higher than that of 16Mn steel. Its low-temperature performance is also something that 16Mn steel does not possess.

The core difference between Q345 steel and Q235 steel

The core difference between Q345 Steel Plate and ordinary carbon steel Q235 lies in the difference of yield strength. Additionally, there are significant differences in comprehensive performance. The yield strength lower limit of Q235 steel is 235 MPa, while that of Q345 steel is 345 MPa, which is much higher than that of Q235 steel. Therefore, Q345 steel plate has better load-bearing capacity and strength, and is more suitable for scenarios with dynamic loads and heavy loads. Moreover, Q345 is a low-alloy steel, while Q235 is a common carbon steel. Q345 has a higher alloy content and performs better in terms of corrosion resistance, low-temperature toughness, and welding performance compared to Q235 steel. It is also more suitable for a wider range of applications, especially in industries and construction fields where the safety performance of steel is highly demanded.

Application Areas and Company Advantages

The application scope of Q345 Steel Plate is extremely broad, covering various industries such as bridges, vehicles, ships, construction, pressure vessels, and special equipment. It can be used to manufacture various structural components, mechanical parts, and building structures that can withstand dynamic loads, and is suitable for various environments including normal temperature and low temperature. Sanhe Steel, as a professional wholesaler integrating steel trading and processing, offers Q345 steel plates with significant advantages. We always have products of various grades and specifications in stock. Relying on our own processing equipment, we can provide customized processing and cutting services. We strictly control raw material procurement and production inspection to ensure that each batch of products meets the performance standards. At the same time, we provide full-process consultation, delivery, and after-sales support to precisely meet the individualized needs of customers in various industries.