Method for eliminating super 304H steel inter-granular corrosion sensitivity

The invention discloses a method for eliminating super 304H steel inter-granular corrosion sensitivity, which includes the following steps: (1) preparation of a solid solution sample: performing homogenization solid solution treatment to a super 304H steel pipe to obtain the solid solution sample having homogeneous tissue, and cutting a flat sheet sample, and grinding the surface of the sample until the surface is flat and smooth to obtain a pre-treated sample for shot blasting treatment; (2) preparation of a shot blasting sample: setting certain shot blasting process parameters, performing surface shot blasting to the solid solution sample with the surface being ground to form a plastic deformation layer, which has certain thickness and hardness, on the surface of the solid solution sample, thereby forming a shot-blasting sample; and (3) desensitization thermal treatment: performing desensitization treatment to the shot-blasting sample at certain temperature for certain time to finally obtain the super 304H steel desensitized sample which is insensitive to inter-granular corrosion. The method is almost free of limitation on shape and size of the sample, is convenient to operate and is low in cost, has high industrial application value, and can quickly and effectively eliminate the inter-granular corrosion sensitivity of the super 304H steel without scarification on high-temperature strength of the material.