plate s235jr as rolled, killed

plate s235jr controlled rolling is that, on the basis of adjusting the chemical composition of plate s235jr, by controlling the heating temperature, rolling temperature, deformation system and other process parameters, the change law of austenite structure and the microstructure of phase transformation products are controlled, so as to achieve the purpose of refining the structure and improving the strength and toughness of plate s235jr.

HG785 steel contains a certain amount of alloying elements and microalloying elements. Its weldability is different from that of carbon steel, plate s235jr. The main reason is that the changes in the structure and properties of the welding heat-affected zone are more sensitive to the welding heat input, the heat-affected zone has an increased tendency to harden, the laminar tearing tendency is large, and there is a danger of reheating cracks, etc.

According to the data of the General Administration of Customs, in April 2020, China exported 6.311 million tons of plate s235jr and so on steel, down 2.6% from March, down 0.3% year on year; from January to April, China exported 20.601 million tons of steel, down 11.7% year on year. In April, China imported 1.044 million tons of steel, down 11.70% from March; from January to April, China imported 4.184 million tons of steel, up 7.4% year on year.