MARINE ATMOSPHERE CORROSION RESISTING AND SEAWATER SPLASHING CORROSION RESISTING F690 STEEL PLATE WITH A THICKNESS OF 210 MM AND EASY TO WELD

摘要

A marine atmosphere corrosion resisting and seawater splashing corrosion resisting F690 steel plate with a thickness of 210 mm and easy to weld, and a preparation method therefor. With Fe as the basic element, the marine atmosphere corrosion resisting and seawater splashing corrosion resisting F690 steel plate with a thickness of 210 mm and easy to weld further comprises chemical components of: C: 0.11%-0.14%; Si: 0.15%-0.35%; Mn: 0.9%-1.15%; P: ≤ 0.006%; S: ≤ 0.002%; Cr: 0.55%-0.75%; Mo: 0.4%-0.6%; Ni: 3.65%-4.0%; Cu: 0.2%-0.4%; Al: 0.06%-0.10%; V: 0.03%-0.06%; Nb: 0.015%-0.04%; N: ≤ 0.007%; H: ≤ 0.00015%; B: 0.0008%-0.002%; Ca: 0.001%-0.005%; and impurity elements, wherein Ca/S ≥ 1, Al ≥ (Mn/C) × (%N), and the carbon equivalent CEV ≤ 0.82%. The steel plate has high mechanical performance and good marine atmosphere corrosion resistance and seawater splashing corrosion resistance, and is excellent in comprehensive performance.