High-temperature-resistant seamless stainless steel pipe and processing process thereof

Abstract

The invention relates to a high-temperature-resistant seamless stainless steel pipe and a processing technology thereof. The surface of the seamless stainless steel pipe is coated with a high-temperature-resistant layer, and the high-temperature-resistant layer comprises, by weight, 12-15 parts of modified phenolic resin; 30-40 parts of an acrylic emulsion; 6-8 parts of m-cyanophenyl isocyanate; 1-2 parts of dimethylaminopropylamine; 1-2 parts of glycerol rosin ester; 5-6 parts of glass microspheres; and 2-4 parts of propylene glycol butyl ether. The processing technology of the high-temperature-resistant seamless stainless steel pipe comprises the steps of preparation of the high-temperature-resistant coating and coating of the high-temperature-resistant layer. According to the invention, dimethylaminopropylamine is taken as a cross-linking agent to cross-link the acrylic emulsion and cyanophenyl isocyanate so as to form a cross-linked network, and meanwhile, aromatic rings are introduced, so that the thermal motion ability of molecular chains is reduced, and the heat resistance is improved; and glycerin promotes interface bonding among the components, and the high temperature resistance is further improved by adding modified phenolic resin and glass microspheres, so that the high temperature resistance of the seamless stainless steel tube is improved, and the service life is prolonged.

Description

technical field [0001] The present application relates to the technical field of seamless steel pipes, in particular to a high-temperature resistant seamless stainless steel pipe and its processing technology. Background technique [0002] The seamless steel pipe is made by perforating the whole round steel, and the steel pipe without weld seam on the surface is called seamless steel pipe. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and pipe jacking. [0003] The existing Chinese patent with the notification number CN109154053B discloses a seamless steel pipe and its manufacturing method. The seamless steel pipe contains C: 0.21-0.35%, Si: 0.10-0.50%, Mn: 0.05-1.00%, P: 0.025% or less, S: 0.010% or less, Al: 0.005 to 0.100%, N: 0.010% or less, Cr: 0.05 to 1.50%, Mo: 0.10 to 1.50%, Nb: 0.010 to 0.050%, B: 0.0003 t...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned seamless steel pipe has excellent SSC resistance and suppresses the strength deviation in the circumferential direction and the axial direction, but the service life of the current seamless stainless steel pipe is usually short in high temperature environment, so the inventor believes that there is still room for improvement