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采用一种新型盐浴对K55石油管线钢进行盐浴渗氮处理,研究了渗层的截面形貌,显微硬度在不同渗层深度上的分布及渗层的耐硫腐蚀性。K55钢经560℃盐浴渗氮处理2h后,表层组织由疏松层、渗氮层及基体扩散层组成。渗层和表面的氧化疏松薄层的厚度分别约为12.48μm和1.54μm,渗层的总深度约为30μm。经渗氮处理的K55钢,其显微硬度明显提高,表面的显微硬度高达695HV,但显微硬度沿渗层深度方向急剧下降。渗氮处理后,K55钢的耐硫腐蚀性能得到明显改善。因此,可利用盐浴渗氮处理来降低油管下井前的腐蚀缺陷。
A new type of salt bath was used to treat K55 oil pipeline steel by salt bath nitriding. The cross-sectional morphology, the distribution of microhardness at different depths and the sulfur-resistant corrosion resistance were studied. K55 steel by 560 ℃ salt bath nitriding 2h after the surface tissue from the loose layer, nitriding layer and the matrix diffusion layer. The thickness of the oxidized and unconsolidated sheet on the surface of the permeation layer and the surface is about 12.48μm and 1.54μm, respectively, and the total depth of the layer is about 30μm. The nitriding treatment of K55 steel, the microhardness increased significantly, the surface microhardness up to 695HV, but the microhardness along the depth of the layer sharp decline. Nitriding treatment, K55 steel sulfur corrosion resistance has been significantly improved. Therefore, salt bath nitriding can be used to reduce the corrosion of tubing before corrosion defects.