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Method for improving high-temperature oxidation resistance of Cr-series austenitic heat-resistant stainless steel

A technology of heat-resistant stainless steel and high-temperature oxidation resistance, which is applied in coatings, metal material coating processes, solid-state diffusion coatings, etc., can solve problems such as rising alloy costs and insufficient high-temperature creep strength, and achieve high-temperature oxidation resistance. Effect

Inactive Publication Date: 2019-11-08
TONGLING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But to form continuous dense Al 2 o 3 In order to maintain the alloy to form a single-phase austenite structure, it is necessary to add a very high content of Ni (mass percent) to the alloy. Subtotal > 25% ~ 30%), which will directly lead to a substantial increase in the cost of the alloy. In addition, although Al-based (high Al) heat-resistant stainless steel has better high-temperature resistance, its high-temperature creep strength is insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for improving the high-temperature oxidation resistance of Cr-based austenitic heat-resistant stainless steel, comprising the following steps:

[0022] Step S1: adding Al to Cr-based austenitic heat-resistant stainless steel to prepare Al-doped Cr-based austenitic heat-resistant stainless steel, wherein the components are: 17-25% Cr, 11-20% % Ni, 1-2% Al, 0-1% C, 0-1% Ti, 0-1% Nb, 0-2% Mo, 0-2% Si, 0-0.5% The mixed elements, the balance is Fe;

[0023] Step S2: Pretreat the surface of the Al-doped Cr-based austenitic heat-resistant stainless steel prepared in step S1, specifically: firstly, the surface of the Al-doped Cr-based austenitic heat-resistant stainless steel is polished with sandpaper and cleaned with acetone After drying, the spray paint will be blackened;

[0024] Step S3: Perform laser melting on the Al-doped Cr-based austenitic heat-resistant stainless steel pretreated in step S3, wherein the laser power is 300-2000w, the spot diameter is 0.5-3m...

Embodiment 2

[0028] A method for improving the high-temperature oxidation resistance of Cr-based austenitic heat-resistant stainless steel, comprising the following steps:

[0029] Step S1: adding Al to Cr-based austenitic heat-resistant stainless steel to prepare Al-doped Cr-based austenitic heat-resistant stainless steel, wherein the components are: 17% Cr, 11% Ni, 1% Al, 1% C, 1% Ti, 1% Nb, 2% Mo, 2% Si, 0.5% mixed elements, and the balance is Fe;

[0030] Step S2: Pretreat the surface of the Al-doped Cr-based austenitic heat-resistant stainless steel prepared in step S1, specifically: firstly, the surface of the Al-doped Cr-based austenitic heat-resistant stainless steel is polished with sandpaper and cleaned with acetone After drying, the spray paint blackens;

[0031] Step S3: The Al-doped Cr-based austenitic heat-resistant stainless steel pretreated in step S3 is subjected to laser melting operation, wherein the laser power is 2000w, the spot diameter is 3mm, the scanning speed is ...

Embodiment 3

[0035] A method for improving the high-temperature oxidation resistance of Cr-based austenitic heat-resistant stainless steel, comprising the following steps:

[0036] Step S1: adding Al to Cr-based austenitic heat-resistant stainless steel to prepare Al-doped Cr-based austenitic heat-resistant stainless steel, wherein the components are: 20% Cr, 15% Ni, 1.5% Al, 0.5% C, 0.5% Ti, 0.5% Nb, 1% Mo, 1% Si, 0.25% mixed elements, and the balance is Fe;

[0037] Step S2: Pretreat the surface of the Al-doped Cr-based austenitic heat-resistant stainless steel prepared in step S1, specifically: firstly, the surface of the Al-doped Cr-based austenitic heat-resistant stainless steel is polished with sandpaper and cleaned with acetone After drying, the spray paint blackens;

[0038] Step S3: The Al-doped Cr-based austenitic heat-resistant stainless steel pretreated in step S3 is subjected to laser melting operation, wherein the laser power is 1500w, the spot diameter is 2mm, the scanning ...

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Abstract

The invention relates to a method for improving the high-temperature oxidation resistance of Cr-series austenitic heat-resistant stainless steel. The preparation method comprises the following steps:first, Al is added to the Cr-series austenitic heat-resistant stainless steel, and the Cr-series austenitic heat-resistant stainless steel doped with Al is prepared; then, the surface is pretreated, the pretreated surface is subjected to laser melting and consolidation, Al floats to the upper part of a molten pool, the Al content becomes high at the upper part of a melting and consolidation layer,and the Al content becomes low at the lower part of the melting and consolidation layer; and finally, a continuous dense Al2O3 protective film which is similar to Al-series heat-resistant stainless steel can be formed on the surface of the Cr-series austenitic stainless steel after pre-oxidation treatment in a high-temperature environment, and then the high-temperature oxidation resistance of theCr-series austenitic heat-resistant stainless steel can be improved. The method provided by the invention has the beneficial effects that through the addition of a small amount of Al to the Cr-seriesaustenitic heat-resistant stainless steel as well as through the laser melting and consolidation technology, the surface of the Cr-series austenitic heat-resistant stainless steel can be coated witha dense AlO protective layer, and then the high-temperature oxidation resistance of the Cr-series austenitic heat-resistant stainless steel can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant stainless steel, and in particular relates to a method for improving the high-temperature oxidation resistance of Cr-based austenitic heat-resistant stainless steel. Background technique [0002] Austenitic heat-resistant stainless steel is one of the main raw materials for high-temperature-resistant devices in energy, chemical and other industrial production. Among them, high-temperature-resistant devices need to withstand a high temperature environment of about 600-900 °C. The traditional Cr-based austenitic heat-resistant stainless steel is due to the Cr formed on the surface 2 o 3 The film can effectively protect the substrate, but due to the Cr in the environment containing water vapor 2 o 3 It is easy to form unstable or volatile Cr-containing hydroxides with water vapor, which seriously deteriorates Cr 2 o 3 The stability of the layer restricts the use of Cr-based (h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/50C22C38/48C22C38/44C22C38/02C21D10/00C23C8/14C23C8/18C23F17/00
CPCC21D10/00C22C38/004C22C38/02C22C38/06C22C38/44C22C38/48C22C38/50C23C8/14C23C8/18C23F17/00
Inventor 王东生周杏花刘玥
Owner TONGLING UNIV