The invention relates to lightweight weathering steel, a preparation method thereof and an automobile body, the thickness of a steel plate of the weathering steel is 1.5-2 mm, and the weathering steel comprises the following chemical components in percentage by mass: 0.020-0.050% of C, 0.35-0.45% of Cu, 0.25-0.35% of Ni, 3.55-3.85% of Cr, 0.15-0.25% of Si and 0.015-0.025% of Ti. The interaction of Cr and Cu can effectively inhibit corrosive anions; ni and Cr are matched to effectively inhibit the invasion of acidic ions, promote the generation of a protective layer and reduce the corrosion rate of steel; ti can form TiC, CrC is prevented from being separated out along the austenite grain boundary, and the intergranular corrosion phenomenon can be prevented. Therefore, the weathering resistant steel adopts Cu-Ni-Cr series elements, so that the corrosion resistance and the weather resistance of the weathering resistant steel are better than those of the traditional weathering resistant steel, and meanwhile, the requirements of light weight, high stamping property and high plate shape size can be met.
本申请涉及一种轻量化耐候钢及其制备方法、汽车车体,所述耐候钢钢板厚度为1.5‑2mm,所述耐候钢的化学成分以质量分数计包括:C:0.020~0.050%,Cu:0.35~0.45%,Ni:0.25~0.35%,Cr:3.55~3.85%,Si:0.15~0.25%,Ti:0.015~0.025%。Cr和Cu相互作用能有效抑制腐蚀性阴离子;Ni和Cr配合能有效抑制酸性离子侵入,促进保护层生成,降低钢的腐蚀速率;Ti能形成TiC,阻止沿奥氏体晶界析出CrC,能防止产生晶间腐蚀现象。因此,该耐候钢采用Cu‑Ni‑Cr系元素,可使其耐腐蚀耐候性能更优于传统的耐候钢,同时可满足轻量化、高冲压性、高板型尺寸的要求。
Lightweight weathering steel, preparation method thereof and automobile body
一种轻量化耐候钢及其制备方法、汽车车体
2023-01-31
Patent
Elektronische Ressource
Chinesisch
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