Extension part of spray pipe and spray pipe

The invention discloses an extension part of a spray pipe and the spray pipe, relates to the technical field of rocket engines, and aims to solve the problem that reliable connection of a titanium alloy extension section and a steel-steel extension section structure cannot be realized. The extension part of the spray pipe comprises a steel-steel extension section and a titanium alloy extension section, the titanium alloy extension section is arranged on one side of the steel-steel extension section and is in brazed connection with the steel-steel extension section, and the surface of the inner wall of the titanium alloy extension section is plated with an anti-oxidation coating so as to improve the anti-oxidation capacity of the titanium alloy extension section. The spray pipe comprises the extension part provided by the technical scheme. The extension part of the spray pipe and the spray pipe provided by the invention are used for realizing light weight of the spray pipe of a rocket engine and realizing reli