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一、前言本课题旨在研制一种外海港口建筑可焊接耐蚀低合金钢。规定研制钢种应达到(1)热轧中板σ_s≥34公斤/毫米~2;(2)-40℃梅氏a_k≥3公斤—米/厘米~2;(3)冷弯合格(b=2a,d=3a,180°);(4)焊接性能良好;(5)飞溅区耐蚀性能比A3钢提高一倍以上。海洋工程用耐蚀低合金钢研究颇受国内外重视。比较成功的有玛丽娜(P-Cu-Ni,美国),NK-玛丽尼G(P-Cu-Cr,日本)和NK-玛丽尼50(Cu-Cr-Al,日本)等,在飞溅区耐蚀性约为普碳钢的1～3倍。由于这些
I. Preface The purpose of this project is to develop a sea-port construction weldable corrosion-resistant low alloy steel. The provisions of the development of steel should be achieved (1) hot-rolled plate σ_s ≥ 34 kg / mm 2; (2) -40 ℃ Meisen a_k ≥ 3 kg - m / cm ~ 2a, d = 3a, 180 °); (4) good welding performance; (5) corrosion resistance of the splash zone is more than double that of A3 steel. Research on corrosion-resistant low alloy steel used in marine engineering is very popular both at home and abroad. More successful are P-Cu-Ni (USA), NK-P-Cu-Cr (Japan) and NK- Corrosion resistance of about 1 to 3 times the general carbon steel. Because of these