For the estimation in April and the second quarter, the estimation on March 16 is still valid, but the decrease in April is 10% higher than the neutral prediction. It is a conservative estimation based on 10% for the high probability event. In the second quarter, the output of overseas pig iron will be reduced by 11.67 million tons, affecting the demand for A572 grade 50 CS steel carbon plate iron ore of about 1.84 million tons; in the first half of the year, the output will be reduced by 18.899 million tons, affecting the demand for iron ore of 32.13 million tons.
After adding trace elements such as phosphorus, copper, chromium, and nickel to Q355NH steel, a dense and highly adherent protective film is formed on the surface of the weathering steel, which prevents rust from spreading and developing, and protects the substrate under the rust layer to slow its corrosion . An amorphous spinel oxide layer of about 50 μm to 100 μm thick formed between the rust layer and the substrate is dense and has good adhesion to the base metal, which greatly improves the atmospheric corrosion resistance of the steel material, A572 grade 50 CS steel carbon plate.
EN10149 S900MC hot-dip zinc-coating steel coil chemical composition (melting analysis)% C: ≤0.20, Si: ≤0.60, Mn: ≤2.20, P: ≤0.025, S: ≤0.015, Al: ≥0.015, Nb: ≤0.09, V: ≤0.20, Ti: ≤0.22, Mo: ≤1.00, B: ≤0.005 The mechanical properties Yield strength: ≥900 MPa Tensile strength:930-1200 MPa Elongation: ≥7%
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