In response to the requirements of the pressure vessel manufacturing industry to reduce the wall thickness and the cost,and improve the safety and reliability of the spherical tank operation,Baogang Group needs to develop a new normalized Q370R high strength pressure vessel steel in line with the new standard as soon as possible to continue to promote product technological innovation.Based on the investigation of the technical requirements and production process of similar steel products for pressure vessels,the smelting,rolling and normalizing process and properties of Q370R steel were studied.The chemical composition of Q370R for high performance pressure vessels is C-Si-Mn,and micro-alloying elements such as Nb,V and Ti are added.The mi-crostructure of the plate is pearlite and ferrite.The strength and plasticity meet the requirements of container steel standards,the strength abundance is moderate,and the strain aging impact work of the plate at-20 ℃ is still above 150 J.After PWHT treat-ment of normalized Q370R plate at 580 ℃,the tensile and impact properties of Q370R plate are still good after 2 hours and 4 hours of insulation,meeting the requirements of standards and users.
Q370R pressure vessel steelchemical compositionnormalizingmicrostructure and property
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