Modified austenitic stainless steel with excellent high temperature creep resistance and preparation method thereof

A technology of austenitic stainless steel and creep property, applied in the field of modified austenitic stainless steel and its preparation, can solve the problem of not meeting the long-term operation requirements of heat exchange tubes, poor high-temperature strengthening effect, and weak layer bonding force, etc. problem, to achieve the effects of excellent creep resistance, improved creep resistance and uniform structure

Active Publication Date: 2020-08-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent document with the application number 201310282671.7 can introduce compressive residual stress on the surface of the aluminized layer to provide surface strength, the bonding force of the obtained aluminized layer is not strong, and the composition of the aluminized layer contains Fe 2 Al 5 Brittle phase, with the large release of compressive residual stress at high temperature, the high temperature strengthening effect is poor, and it cannot meet the long-term operation requirements of heat exchange tubes

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  • Modified austenitic stainless steel with excellent high temperature creep resistance and preparation method thereof
  • Modified austenitic stainless steel with excellent high temperature creep resistance and preparation method thereof
  • Modified austenitic stainless steel with excellent high temperature creep resistance and preparation method thereof

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preparation example Construction

[0041] A kind of preparation method of the modified austenitic stainless steel with excellent high temperature creep resistance of the present invention comprises the following steps:

[0042] (1) Surface mechanical polishing: the hot-rolled austenitic stainless steel plate is polished with sandpaper of different particle sizes (80-1200#) until no obvious scratches are visible to the naked eye, and then cleaned with acetone in ultrasonic waves for 5-20 minutes to remove oil and no Ultrasonic cleaning with water and ethanol for 5 to 20 minutes to remove stains, and finally put it in a drying oven at 80°C for 20 to 40 minutes; the 321 austenitic stainless steel is a rolled plate, and the mass fraction of its chemical composition is C 0.04%, Si 0.38%, Mn 1.08%, Cr 17.02%, Ni 9.06%, N0.05%, P 0.03%, Ti 0.22%, and the rest is Fe. The mechanical properties of 321 stainless steel at room temperature are: tensile strength (σb) 667MPa, yield strength (σ0.2) 245 MPa, elongation 56.5%, a...

Embodiment 1

[0050] A kind of preparation method of the modified austenitic stainless steel with excellent high temperature creep resistance of the present invention comprises the following steps:

[0051] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel plate sample is polished with sandpaper of different particle sizes (80 mesh to 1200 mesh) until no obvious scratches are visible to the naked eye, and then cleaned with acetone in ultrasonic waves for 5 minutes to remove oil. Ultrasonic cleaning with absolute ethanol for 5 minutes, stain removal, and finally drying in a drying oven at 80°C for 20 minutes; 321 austenitic stainless steel is a rolled plate, and the mass fraction of its chemical composition is C 0.04%, Si 0.38%, Mn 1.08%, Cr 17.02%, Ni 9.06%, N 0.05%, P0.03%, Ti 0.22%, and the rest is Fe. Heat treatment state: the mechanical properties of 321 stainless steel at room temperature are: tensile strength (σ b ) is 667 MPa, the yield strength (σ 0.2 ) i...

Embodiment 2

[0059] A kind of preparation method of the modified austenitic stainless steel with excellent high temperature creep resistance of the present invention comprises the following steps:

[0060] (1) Surface mechanical polishing: The hot-rolled plate austenitic stainless steel sample is polished with sandpaper of different particle sizes (80 mesh to 1200 mesh) until no obvious scratches are visible to the naked eye, and then cleaned with acetone in ultrasonic wave for 10 minutes to remove oil and no scratches. Ultrasonic cleaning with water and ethanol for 10 minutes, removing stains, and finally drying in a drying oven at 80°C for 30 minutes; 321 austenitic stainless steel is a rolled plate, and the mass fraction of its chemical composition is C 0.04%, Si 0.38%, Mn 1.08%, Cr 17.02%, Ni 9.06%, N 0.05%, P0.03%, Ti 0.22%, and the rest is Fe. The mechanical properties of 321 stainless steel at room temperature are: tensile strength (σ b ) is 667 MPa, the yield strength (σ 0.2 ) is...

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Abstract

The invention discloses a modified austenitic stainless steel with excellent high-temperature creep resistance and a preparation method. The modified steel includes a steel substrate and a permeated layer, and the permeated layer includes a 40-80 μm Al-containing Fe phase diffusion layer from the inside to the outside. , 50-100μm Fe-Al compound layer and 10-20μm Al 2 o 3 film. The preparation methods include: (1) electrolytic polishing; (2) aluminizing: treatment at 400-600°C and 900-1050°C respectively, and furnace cooling; (3) sandblasting: carrying out under nitrogen gas of 0.6-0.9MPa; ( 4) Annealing: annealing at 1000-1100°C, furnace cooling; (5) Laser shock peening: single pulse energy 4-7J, spot diameter 2.6-3mm, times 1-3. The modified steel of the invention has excellent creep resistance and corrosion resistance under the condition of molten aluminum-silicon alloy, has no brittle phase in the infiltrated layer, has strong bonding force with the matrix, and has good spalling resistance, toughness and strength.

Description

technical field [0001] The invention relates to the technical field of heat exchange tube materials, in particular to a modified austenitic stainless steel with excellent high temperature creep resistance and a preparation method thereof. Background technique [0002] Solar thermal power generation (also known as concentrated solar thermal power generation, Concentrating Solar Power, CSP) has the advantages of stable, continuous and controllable power output and can realize complementarity with photovoltaic and wind power. Representatives are widely valued. The heat storage system is the main link of the CSP power station. At present, the heat storage media of commercial CSP power stations mainly use water vapor, molten salt and heat transfer oil. Due to the low heat storage capacity of water vapor, the low thermal conductivity of molten salt, the high temperature is easy to decompose and the solid-liquid stratification, and the high temperature of heat transfer oil (above ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C23C10/50C23C10/60C21D1/26C21D1/74C21D10/00C23C10/02C25F3/24
CPCC21D1/26C21D1/74C21D10/00C23C10/02C23C10/50C23C10/60C25F3/24
Inventor李微陈荐许栋梁李传常邱玮任延杰何建军陈建林彭卓寅
OwnerCHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY