Oil well tubing coupling and sucker rod joint integrated boriding method

Abstract

The invention relates to a boronizing method of integration of a pumping tube coupling and a pumping rod collar, which is characterized in that the tube coupling is used as a container for containing a boronizing agent, the rod collar is used as a mandrel for reducing heat capacity and increasing cooling rate during the cooling process, the rod collar is placed in the middle of the boronizing agent inside the tube coupling and heated by high temperature. The ingenious conception of the method can ensure that the tube coupling can reach higher tensile properties, the effects of anticorrosion and wear-resistance are much better than the rod collar and tube coupling made by common heat treating method, and the same amount of boronizing rod collars can be produced when the boronizing tube couplings are being made, thus increasing the production efficiency significantly, reducing the amount of boronizing agent used and decreasing the cost greatly. The hardness of the inner surface of the tube coupling and the outer surface of the rod collar obtained through the methods is HV 1100 to 1600, the thickness of the boronizing layer is 50 Mum to 90 Mum, the yield strength of the tube coupling is more than 552 MPa, the tensile strength is more than 689 MPa, and the elongation is more than 16 percent.

Description

technical field [0001] The invention relates to an integrated boronizing method for an anti-corrosion and wear-resistant oil suction pipe coupling and a sucker rod coupling. Background technique [0002] Boronizing treatment can significantly improve the surface hardness and wear resistance of steel parts, and the friction coefficient is small. The hardness of the boronizing layer can reach HV1100-2000, and it has excellent abrasive wear resistance. The boronizing layer also has good heat resistance and corrosion resistance. Boronizing treatment is currently one of the best processes to improve the wear resistance of steel parts. Boronizing methods include solid powder boronizing, paste boronizing, gas boronizing and salt bath boronizing, among which the solid powder boronizing method is the most widely used boronizing method at present. The agent and the filler are mixed evenly, and then they are put into the infiltration box with the workpiece and sealed, and then kept ...

AI Technical Summary

Problems solved by technology

However, at present, there is no domestic application of solid powder boronizing technology for pipe couplings and rod couplings to improve surface corrosion resistance and wear resistance

Ordinary pipe couplings are mostly made of N80 steel, and the mechanical properties are mostly obtained by normalizing; ordinary sucker rod couplings are mostly made of 45 steel, and the hardness after quenching and tempering is HB220-250, which is excellent in corrosion resistance and wear resistance. very limited

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