Carbon Steel Standard JIS SM490B plates

Q345 steel has good comprehensive mechanical properties, acceptable low temperature performance, good plasticity and weldability. Q345 steel is used to make mechanical parts, building structures, general metal structural parts for medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures that bear dynamic loads. JIS SM490B plates It is used in hot rolled or normalized state. In addition, Q345 steel is also widely used in construction, bridges, vehicles, ships, pressure vessels, etc.The company adheres to the business tenet of "integrity casting strength, cooperation creating win-win", takes value-added service of supply chain as the tenet, and under the premise of existing market, bulk trade, logistics distribution and other advantages, develops a new comprehensive steel industry model combined with informatization. And will continue to provide customers with high-quality steel products and good service. We sincerely welcome new and old customers to join hands with our company and seek common development!No. 45 steel is commonly used medium carbon quenched and tempered structural steel. The cold plasticity of No. 45 steel is generally better than . Annealing and normalizing are better than quenching and tempering. No. 45 steel has higher strength and better machinability than Q345 steel. After proper heat treatment, it can obtain certain toughness, plasticity and wear resistance. No. 45 steel is suitable for hydrogen welding and argon arc welding, but not suitable for gas welding. Preheating is required before welding, and stress relief annealing shall be conducted after welding.With the increase of temperature, the yield limit of will decrease monotonically, but the tensile strength of will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of . Near the blue brittleness temperature, the JIS SM490B plates strength increases and the plasticity decreases. The elongation and section shrinkage of JIS SM490B plates increase with the increase of temperature, but there is a low peak at the blue brittleness temperature The blue brittleness temperature of low carbon steel ranges from 200 ℃ to 250 ℃ The blue brittleness of low alloy steel is not obvious as that of low carbon steel, and the blue brittleness temperature is higher,JIS SM490B plates.Our quality and service commitment: product quality problems, life-long replacement.In the process of using, any time if you find we supplied steel materials not conform to the requirements of technical standards, we can replace it for you free of charge. However, it should be noted that non product quality problems caused by improper use are not covered by the warranty. Please pay attention to the service time commitment as well as the product quality assurance commitment. Because only the products of big brands and reliable enterprises with complete after-sales service system can truly realize the long-term product quality assurance and the whole process of service.JIS SM490B plates