GB/T 1591 Q345B HSLA steel plates are engineering structure steel developed by adding a small amount of Mn, Si and a tiny bit of Nb, V, Ti, Al and other alloy elements on the basis of carbon structural steel. The so called low alloy refers to the total alloy element in GB/T 1591 Q345B HSLA steel plates does not exceed 3%. High strength is relative to carbon engineering structural steel.
The principle of developing GB/T 1591 Q345B HSLA steel plates is to obtain as high comprehensive mechanical properties as possible by using as few alloy elements as possible so as to meet the purpose of meeting the use and low cost. Q345B HSLA steel plates can meet the requirements of various structures requiring large load, at the same time, it is required to reduce the weight of the structure, improve the reliability and save the material and resources.
GB/T 1591 Q345B HSLA steel plates are mainly used to make various engineering structures requiring high strength, such as bridges, ships, vehicles, high pressure vessels, oil transmission and gas pipelines, large steel structures, etc. Because Q345B steel plates do not have complex treatment process, even without heat treatment, high strength can be obtained and the quality of engineering structure is greatly reduced. Therefore, GB/T 1591 Q345B HSLA steel plates are used instead of general carbon structure steel.
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