2results about How to "Low hardness value" patented technology

This invention discloses an internally threaded steel pipe, its processing technology, and processing device. The internally threaded steel pipe includes a stainless steel inner tube (1), which is formed by rolling stainless steel strip. The inner wall of the stainless steel inner tube (1) is provided with thread teeth (2). The number of thread teeth (2) is multiple and they are distributed in a ring along the inner wall of the stainless steel inner tube (1). A thread groove is formed between adjacent thread teeth (2). This invention can reduce the production cost of internally threaded pipes for air conditioners and improve their service life.

This invention provides a method and system for repairing defects on the sealing surface of a nuclear reactor pressure vessel, belonging to the field of nuclear power maintenance technology. The repair method includes: inspecting the sealing surface of the pressure vessel for defects; employing appropriate repair methods, such as polishing or welding, based on the distribution, type, and size of the defects. The welding repair process and parameters are determined based on the remaining anti-corrosion layer thickness at the bottom of the weld bevel after defect removal, the welding temperature field simulated by finite element analysis, and the welding effect evaluation on a test piece; after welding, the repaired area is ground to ensure the repaired area meets the requirements for flatness and roughness. This invention significantly improves repair efficiency, ensures repair effectiveness, reduces personnel exposure time, and extends the service life of the pressure vessel sealing surface.