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Anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel for turbocharger shell and preparation method of CREE rare earth heat-resistant steel

A turbocharger and anti-oxidation technology, applied in the field of auto parts, can solve problems such as insufficient oxidation resistance, low alloy cost, thermal fatigue cracking, etc., achieve obvious technical and cost advantages, solve high-temperature oxidation, prolong The effect of service life

Pending Publication Date: 2022-03-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide an oxidation-resistant and fatigue-resistant CNRE rare earth heat-resistant steel for a turbocharger housing and a preparation method thereof. By controlling the C / N atomic ratio and rare earth microalloying, the high-temperature oxidation resistance and resistance Thermal fatigue performance, solving the technical problems of insufficient oxidation resistance and thermal fatigue cracking of traditional high-Cr-high-Ni heat-resistant steel turbocharger shells, with low alloy cost, thus greatly improving the service life of turbochargers ,reduce manufacturing cost

Method used

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  • Anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel for turbocharger shell and preparation method of CREE rare earth heat-resistant steel
  • Anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel for turbocharger shell and preparation method of CREE rare earth heat-resistant steel
  • Anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel for turbocharger shell and preparation method of CREE rare earth heat-resistant steel

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Experimental program
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Effect test

Embodiment 1

[0053] In this embodiment, the turbocharger housing is made of anti-oxidation and fatigue-resistant CNRE rare earth heat-resistant steel, and the specific components are as follows by weight percentage:

[0054] element Content (mass fraction, wt.%) C+N 0.6 (C0.20, N0.40) Si 1.5 mn 7.5 Cr 18.8 Ni 2.5 V 0.15 Nb 0.08 RE 0.025 Fe margin

[0055] In this embodiment, the preparation process of the anti-oxidation and fatigue-resistant CNRE rare earth heat-resistant steel for the turbocharger housing is as follows:

[0056] The molten steel is smelted in an intermediate frequency furnace, and the lining of the intermediate frequency furnace is made of alkaline refractory materials and alkaline ladles. Alloy ingredients are scrap steel, metal chromium, ferrochrome nitride, high carbon ferrochrome, electrolytic manganese, nickel plate, ferrosilicon, ferroniobium, ferrovanadium, etc. Among them, ferrochromium nitride...

Embodiment 2

[0061] In this embodiment, the turbocharger housing is made of anti-oxidation and fatigue-resistant CNRE rare earth heat-resistant steel, and the specific components are as follows by weight percentage:

[0062]

[0063]

[0064] In this embodiment, the preparation process of the anti-oxidation and fatigue-resistant CNRE rare earth heat-resistant steel for the turbocharger housing is as follows:

[0065] The molten steel is smelted in an intermediate frequency furnace, and the lining of the intermediate frequency furnace is made of alkaline refractory materials and alkaline ladles. Alloy ingredients are scrap steel, low-carbon ferrochrome, nitrided ferrochrome, high-carbon ferrochrome, electrolytic manganese, nickel plate, ferrosilicon, ferro-niobium, ferro-vanadium, etc. Among them, ferrochromium nitride is crushed to less than 50mm, together with ferrosilicon, high-carbon ferrochrome, low-carbon ferrochrome, scrap steel, etc., are preheated at 650°C for more than 4 hou...

Embodiment 3

[0070] In this embodiment, the turbocharger housing is made of anti-oxidation and fatigue-resistant CNRE rare earth heat-resistant steel, and the specific components are as follows by weight percentage:

[0071] element Content (mass fraction, wt.%) C+N 0.9 (C0.25, N0.65) Si 2.0 mn 10.0 Cr 15.5 Ni 5.6 V 0.10 Nb 0.25 RE 0.010 Fe margin

[0072] In this embodiment, the preparation process of the anti-oxidation and fatigue-resistant CNRE rare earth heat-resistant steel for the turbocharger housing is as follows:

[0073] The molten steel is smelted in an intermediate frequency furnace, and the lining of the intermediate frequency furnace is made of alkaline refractory materials and alkaline ladles. Alloy ingredients are scrap steel, low-carbon ferrochrome, nitrided ferrochrome, high-carbon ferrochrome, electrolytic manganese, nickel plate, ferrosilicon, ferro-niobium, ferro-vanadium, etc. Among them, ferrochro...

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Abstract

The invention relates to the field of automobile parts, in particular to anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel for a turbocharger shell and a preparation method of the anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel. The alloy comprises the following components in percentage by weight: 0.1 to 0.5 percent of C, 1.0 to 3.0 percent of Si, 5.0 to 10.0 percent of Mn, 15.0 to 25.0 percent of Cr, 1.0 to 6.0 percent of Ni, 0.05 to 0.50 percent of V, 0.05 to 0.50 percent of Nb, 0.2 to 0.7 percent of N, 0.005 to 0.5 percent of RE and the balance of Fe. According to the anti-oxidation and anti-fatigue CREE rare earth heat-resistant steel for the automobile turbocharger shell, by controlling the C / N atom proportion, a film-shaped second phase is formed at the grain boundary, intragranular oxidation is inhibited, and the high-temperature oxidation resistance is improved; by means of the inhibition effect of rare earth elements on second phase growth, the high-temperature structure stability is improved, and thus the thermal fatigue resistance is improved. The intermediate frequency furnace high-nitrogen alloying, high-purity rare earth treatment and sand casting technologies are adopted, a turbocharger shell casting which is uniform in component, compact in structure and excellent in performance is obtained, and the technical problems of high-temperature oxidation, fatigue cracking and the like of a furnace turbocharger can be effectively solved.

Description

technical field [0001] The invention relates to the field of auto parts, in particular to an oxidation-resistant and fatigue-resistant CNRE rare earth heat-resistant steel for a turbocharger housing and a preparation method thereof. Background technique [0002] Turbocharging technology can effectively increase engine output power, improve fuel economy and reduce exhaust emissions. Therefore, under the current global trend of energy saving and emission reduction, turbocharging technology is becoming more and more popular. Turbochargers work under high temperature conditions. With the improvement of people's requirements for engine performance, the operating temperature of turbochargers continues to increase. At present, the highest temperature can reach 1050 ° C ~ 1150 ° C. At the same time, it is subjected to alternating loads and complex high-temperature gases. Such a harsh service environment puts forward strict performance requirements for turbocharger housing materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/34C22C38/46C22C38/48C22C38/58B22C9/02B22C9/22C21C7/00C21C7/06C22C33/06
CPCC22C38/02C22C38/58C22C38/34C22C38/46C22C38/48C22C38/001C22C38/005C22C33/06C21C7/0006C21C7/06B22C9/02B22C9/22
Inventor 胡小强郑雷刚李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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