Material for piston rod in ultra-low temperature reciprocating compressor and surface reinforcing method of material

Abstract

The invention discloses a material for a piston rod in an ultra-low temperature reciprocating compressor and a surface reinforcing method of the material and belongs to the technical filed of materials of ultra-low temperature moving parts and surface reinforcing in equipment manufacturing industries. The material of the piston is obtained by means of the method that 1Ni9 steel forge pieces serveas a raw material and are sequentially subjected to performance heat treatment, finishing and stable treatment, wherein as for the performance heat treatment process, normalizing treatment is conducted at the temperature of 890-910 DEG C, primary quenching is conducted at the temperature of 810-830 DEG C, secondary quenching is conducted at the temperature of 660-680 DEG C, and tempering treatmentis conducted at the temperature of 570-590 DEG C. The surface of the material of the piston is sprayed with a WC-Co coating through a supersonic flame spraying technology. The material of the pistonrod and the coating quality meet the performance requirements of the parts under the ultra-low temperature, the difficult problem of selecting of the materials of the main parts such as the piston rodof the ultra-low temperature reciprocating compressor equipment and the surface reinforcing method is solved, and the foundation is laid for future better and quicker development of natural gas and hydrocarbon liquefaction, storage and conveying device equipment in China.

Description

technical field [0001] The invention relates to the technical field of material and surface strengthening of ultra-low temperature moving parts in the equipment manufacturing industry, in particular to a material and surface strengthening method for a piston rod in an ultra-low temperature reciprocating compressor. The piston rod is used as an ultra-low temperature reciprocating compressor The key parts in the compressor are used, and the operating temperature of the ultra-low temperature reciprocating compressor is -160~-180°C. Background technique [0002] In the LNG (liquefied natural gas liquefied natural gas) receiving station, the cryogenic compressor is used to extract the boil-off gas (referred to as BOG) in the LNG storage tank and transport it to other processing equipment, so as to avoid excessive pressure in the storage tank. The ultra-low temperature reciprocating compressor can directly suck BOG from the LNG storage tank, and the suction temperature is usually ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a material and surface strengthening method for the piston rod in the ultra-low temperature reciprocating compressor. The quality of the piston rod material and coating quality of the invention meets the performance requirements of the parts at ultra-low temperature, and solves the problem of the ultra-low temperature reciprocating compressor equipment. Difficulties in selecting materials and surface strengthening methods for main parts such as piston rods

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