According to the market forecast released by Eurofer on August 5, the output of all A709 grade 50 structural steel sheet steel consumption industries in the European Union will drop by 12.8% in 2020, and rise by 8.9% in 2021. However, the European Union said that the government's "awesome strength" support will reduce the A709 grade 50 structural steel sheet steel consumption intensity in the construction industry significantly less than other industries.
During cladding welding of hardfacing wear-resistant steel plate, A709 grade 50 structural steel sheet, preheating and slow cooling should not be adopted. Sometimes, forced cooling measures are even taken to reduce the residence time of weld in the temperature range of 400-850℃ to prevent local chromium deficiency in austenite grain boundary and σ brittle phase in the plate, resulting in 475℃ brittleness, so as to ensure that the weld metal has good mechanical properties and intergranular corrosion resistance.
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