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近年来随着科学技术的不断发展,对18—8铬镍型耐酸不锈钢的抗腐蚀性能提出了更高的要求。晶间腐蚀是不锈钢破坏的最危险形式,特别是焊接体,易产生刀口腐蚀。产生晶间腐蚀的原因通常认为是由于在晶界析出碳化物引起的。因此,为了提高钢的抗晶间腐蚀和刀口腐蚀性能,最有效的方法是将钢中含碳量降到0.03%以下。这样低的含碳量足以防止在焊接期间碳化物的沉淀,从根本上防止了晶间腐蚀和刀口腐蚀。因此随着氧气
In recent years, with the continuous development of science and technology, the corrosion resistance of 18-8 chrome-nickel acid-resistant stainless steel is put forward higher requirements. Intergranular corrosion is the most dangerous form of stainless steel damage, especially welded body, easy to produce knife-edge corrosion. The cause of intergranular corrosion is generally believed to be due to precipitation of carbides at grain boundaries. Therefore, in order to improve the intergranular corrosion and knife edge corrosion resistance of steel, the most effective method is to reduce the carbon content of steel below 0.03%. Such a low carbon content is sufficient to prevent precipitation of carbides during welding, fundamentally preventing intergranular corrosion and knife edge corrosion. So with oxygen