Cr-Mo-Ni-Ti-V sealing ring of turbocharger

Abstract

The invention discloses a Cr-Mo-Ni-Ti-V sealing ring of a turbocharger, comprising the following chemical compositions in percentage by weight: C 1.1-1.3%, Si 0.6-1.3%, Mn <= 0.6%, P <=0.06%, S <=0.04%, Cr 12-14%, Mo 1.0-1.3%, Ni <=0.5%, Ti <=0.35%, V 0.15-0.35%, Re residual amount of 0.025-0.04%, and the balance of Fe. The Cr-Mo-Ni-Ti-V sealing ring of the turbocharger not only has the advantages of good abrasion resistance, heat stability and rigidity of Cr-Mo-Ni, but also overcomes the defect of poor toughness of Cr-Mo-Ni cast steel so that the Cr-Mo-Ni-Ti-V sealing ring of the turbocharger has better abrasion resistance and toughness; furthermore, the Cr-Mo-Ni-Ti-V sealing ring of the turbocharger has less elastic force loss rate than a Cr-Mo-Ni cast steel sealing ring and a stainlesssteel sealing ring at high temperature; and the Cr-Mo-Ni-Ti-V sealing ring of the turbocharger has a tangential elastic force loss rate of less than 10% at 350 DEG C, and a rigidity loss rate of lessthan 5% after being subjected to heat preservation for 3 hours at 600 DEG C. The alloy can be applied to not only the sealing ring of the turbocharger, but also parts such as an air-releasing valve of an engine valve seat ring / belt, an actuator bearing of a turbocharger with variable cross section and the like.

Description

technical field [0001] The present invention relates to sealing rings, in particular to internal combustion engine turbocharger sealing rings. Background technique [0002] The sealing ring is an important part of the turbocharger. It has been working continuously at high temperature and high speed for a long time, and the working conditions are very harsh. The sealing ring is easy to lose its elasticity and excessive wear and lose its sealing effect, resulting in oil leakage, air leakage, and damage to the turbocharger. balance, thereby reducing the working quality of the turbocharger, and the working quality of the turbocharger directly affects the working performance of the internal combustion engine. The performance of the turbocharger sealing ring is directly related to its material. There are mainly three types of existing sealing rings according to their materials: chrome stainless steel sealing ring, tungsten steel sealing ring and chrome-molybdenum-nickel steel seal...

AI Technical Summary

Problems solved by technology

[0002] The sealing ring is an important part of the turbocharger. It has been working continuously at high temperature and high speed for a long time, and the working conditions are very harsh. The sealing ring is easy to lose its elasticity and excessive wear and lose its sealing effect, resulting in oil leakage, air leakage, and damage to the turbocharger. balance, thereby reducing the working quality of the turbocharger, and the working quality of the turbocharger directly affects the working performance of the internal combustion engine

The performance of the turbocharger sealing ring is directly related to its material. There are mainly three types of existing sealing rings according to their materials: chrome stainless steel sealing ring, tungsten steel sealing ring and chrome-molybdenum-nickel steel sealing ring. They have their own advantages and disadvantages: although the manufacturing cost of chromium stainless steel sealing ring is low, its heat resistance, wear resistance and thermal stability are poor, and it is generally used in the compressor end of turbochargers and supporting machines with low speed; Tungsten steel sealing ring has good thermal stability and red hardness at high temperature, but its manufacturing process is complicated, the manufacturing cost is high, and because of its high hardness, the matching parts are easy to wear, so it is generally used in turbochargers with low speed and matching The turbine end of the machine; although the chrome-molybdenum-nickel sealing ring has high wear resistance, high thermal stability and suitable hardness, it has poor toughness