Grade Q420GJC standard is GB/T 19879, steel plate material category for building structure, low alloy high strength steel product, hot rolled material use for construction and bridge description. A516 Grade 55 [380] carbon steel sheet, Q420GJC steel is used to manufacture high-rise building structures, large-span structures and other important building structures with a thickness of 6-100mm Steel plate.
The addition of Ca element in steel such as A516 Grade 55 [380] carbon steel sheet can refine grain size, partly desulphurize and change the composition, quantity and morphology of non-metallic inclusions. It is similar to that of adding rare earth in steel. It can improve the corrosion resistance, wear resistance, high temperature and low temperature resistance of steel, improve the impact toughness, fatigue strength, plasticity and welding performance of the steel, and increase the cold heading, shock resistance, hardness and contact endurance strength of the steel.
The company has strict control on the quality of A516 Grade 55 [380] carbon steel sheet. Each A516 Grade 55 [380] carbon steel sheet is inspected for the whole process, including raw material purchase, production process according to the procedures and relevant regulations. According to the technical standards and technical requirements, the composite quality inspection is carried out to confirm whether the A516 Grade 55 [380] carbon steel sheet meets the specified quality requirements.
The price of hot coils in Tianjin dropped by RMB 20/ton from last week, and the price of hot coils in Tangshan remained unchanged from last week. The price of hot coils in Beijing increased by RMB 20/ton from last week. From a month-to-year perspective, the price of hot coils in Beijing-Tianjin-Hebei increased by RMB 320-390/ton from the previous month. From a year-on-year perspective, the price of hot coils in the Beijing-Tianjin-Hebei region was 960-1080 yuan/ton higher than the same period last year.
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