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CN-122013065-A - Turbocharger moving parts formed of stainless steel alloy

CN122013065ACN 122013065 ACN122013065 ACN 122013065ACN-122013065-A

Abstract

Turbocharger moving parts formed of stainless steel alloy. There is provided a turbocharger moving part comprising, as at least a part of its constitution, an austenitic stainless steel alloy consisting of, by weight, 23% to 27% of chromium, 19% to 22% of nickel, 0.5% to 2.0% of manganese, 1.2% to 1.4% of carbon, 1.6% to 1.8% of silicon, less than 0.2% of molybdenum, and the balance of iron, and other unavoidable/unavoidable impurities present in minute amounts, wherein niobium and tungsten are excluded in addition to unavoidable impurity amounts.

Inventors

  • M. WILSON

Assignees

  • 盖瑞特动力科技(上海)有限公司
  • 盖瑞特动力科技(武汉)有限公司

Dates

Publication Date
20260512
Application Date
20190925
Priority Date
20180925

Claims (12)

  1. 1. A turbocharger moving part comprising, as at least part of its composition: An austenitic stainless steel alloy, wherein the austenitic stainless steel alloy consists of the following elements by weight: 23% to 27% of chromium, 19% To 22% of nickel, 0.5 To 2.0% manganese, 1.2 To 1.4% carbon, 1.6 To 1.8% silicon, Less than 0.2% molybdenum, and The balance iron, and other unavoidable/unavoidable impurities present in trace amounts, wherein niobium and tungsten are excluded in addition to the unavoidable impurity amounts.
  2. 2. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises 24% to 26% chromium.
  3. 3. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises 19% to 21% nickel.
  4. 4. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises 1.0% to 1.5% manganese.
  5. 5. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises 0.05% to 0.2% molybdenum.
  6. 6. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises 1.65% to 1.75% silicon.
  7. 7. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises 1.25% to 1.35% carbon.
  8. 8. The turbocharger moving part of claim 1, wherein the austenitic stainless steel alloy comprises sulfur in an amount less than 0.01% and phosphorus in an amount less than 0.04%.
  9. 9. The turbocharger moving component of claim 1, wherein the turbocharger moving component comprises a wastegate system.
  10. 10. The turbocharger moving component of claim 1, wherein the turbocharger moving component comprises a variable geometry system.
  11. 11. A turbocharger comprising the turbocharger moving part of claim 1.
  12. 12. A vehicle comprising the turbocharger of claim 1.

Description

Turbocharger moving parts formed of stainless steel alloy The present patent application is a divisional application of the invention patent application with the application number 201910911389.8 and the application date 2019, 9 and 25, named "austenitic stainless steel alloy and turbocharger moving part formed of stainless steel alloy". Technical Field The present disclosure relates generally to iron-based alloys, such as austenitic stainless steel alloys, and articles of manufacture formed therefrom. More specifically, the present disclosure relates to stainless steel alloys for use in, for example, turbine and turbocharger moving parts, wherein such moving parts exhibit increased wear resistance at elevated (turbocharger operating) temperatures. Background In the context of turbine engines, turbochargers use the heat and volumetric flow of the engine exhaust to pressurize or boost the flow of intake air into the combustion chamber. Specifically, exhaust gas from the engine is routed into the turbocharger turbine housing. The turbine is mounted inside the housing and the exhaust flow rotates the turbine. The turbine is mounted on one end of a shaft having a radial air compressor mounted on an opposite end thereof. Thus, the rotational action of the turbine also rotates the air compressor. The spinning action of the air compressor causes intake air to enter the compressor housing and to be pressurized or boosted prior to mixing with fuel and combustion within the engine combustion chamber. Various systems within turbochargers include friction interfaces, i.e., surfaces of components that interact with each other and move relative to each other when the turbocharger is in operation. Such components, commonly referred to as moving components, may be susceptible to friction and wear, particularly at elevated temperatures, which can reduce their useful life. Examples of turbocharger systems that may include moving parts include wastegate systems that divert exhaust gas away from the turbine to regulate airflow to the turbine, and variable geometry systems that include a row of movable inlet vanes to achieve the same objective. These systems typically include various components, such as shafts, bushings, valves, etc., that are moving components because they interact and move relative to each other and thus they are subject to frictional wear. In the prior art, grade 310 stainless steel may have been used for this component, but this stainless steel has proven undesirable due to its relatively high cost. Therefore, effective (and less costly) alternatives would be welcome in the art, provided that the appropriate material properties are retained. Accordingly, it is desirable to provide materials suitable for use in manufacturing moving parts for turbine engines that are capable of resisting wear during operation at elevated temperatures. Furthermore, other desirable features and characteristics of the present subject matter will become apparent from the subsequent detailed description of the present subject matter and the appended claims, taken in conjunction with the accompanying drawings and the background of the present subject matter. Disclosure of Invention Austenitic stainless steel alloys and turbocharger moving parts made from the alloys are provided. In an embodiment, by way of example only, the austenitic stainless steel alloy includes or consists of about 23% to about 27% chromium, about 18% to about 22% nickel, about 0.5% to about 2.0% manganese, about 1.2% to about 1.4% carbon, about 1.6% to about 1.8% silicon, about 0% to about 0.5% molybdenum, less than about 0.01% sulfur, less than about 0.04% phosphorus, and the balance iron and other unavoidable/unavoidable impurities present in trace amounts. With respect to the foregoing alloy embodiments, the amount of chromium may be limited to about 24% to about 26%, alternatively or additionally, the amount of nickel may be limited to about 19% to about 21%, alternatively or additionally, the amount of manganese may be limited to about 1.0% to about 1.5%, alternatively or additionally, the amount of carbon may be limited to about 1.25% to about 1.35%, alternatively or additionally, the amount of silicon may be limited to about 1.65% to about 1.75%, and alternatively or additionally, the amount of molybdenum may be limited to about 0.05% to about 0.3%. In another embodiment, by way of example only, the turbocharger moving part is manufactured at least partially using an austenitic stainless steel alloy comprising or consisting of, by weight, about 23% to about 27% chromium, about 18% to about 22% nickel, about 0.5% to about 2.0% manganese, about 1.2% to about 1.4% carbon, about 1.6% to about 1.8% silicon, about 0% to about 0.5% molybdenum, less than about 0.01% sulfur, less than about 0.04% phosphorus, and the balance iron, and other unavoidable/unavoidable impurities present in trace amounts. With respect to the foregoing turbocharger moving part embodime