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High-temperature oxidation-resistant austenitic heat-resistant stainless steel and its preparation method and use

A technology of heat-resistant stainless steel and high-temperature oxidation resistance, which is applied in the field of metallurgy, can solve the problems of high-temperature creep resistance and high-temperature oxidation resistance, etc., achieve good resistance to high-temperature steam corrosion, purify grain boundaries, and improve high-temperature tensile strength. The effect of stretchability

Active Publication Date: 2021-09-28
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned patent application only relies on the precipitation of carbides in the second phase for strengthening, and the high-temperature creep resistance and high-temperature oxidation resistance are not ideal.

Method used

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  • High-temperature oxidation-resistant austenitic heat-resistant stainless steel and its preparation method and use
  • High-temperature oxidation-resistant austenitic heat-resistant stainless steel and its preparation method and use
  • High-temperature oxidation-resistant austenitic heat-resistant stainless steel and its preparation method and use

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preparation example Construction

[0038] In a second aspect, the present invention provides a method for preparing an austenitic heat-resistant stainless steel resistant to high temperature oxidation, including the steps of forging and hot rolling, specifically, including:

[0039] The first step, forging: heating the billet to 1150-1200°C, holding time (0.5~0.8)×D 1 minutes (where D 1 is the maximum cross-sectional length of the billet, its value is, for example, 100mm), forged into a square billet, and air-cooled after forging.

[0040] In this step, the cast slab comes from the upstream process. For example, the molten steel composed of the following elements can be obtained by smelting, continuous casting or die casting: C0.04-0.1%, Cr14-17%, Ni 20-25 %, Al 2-4%, Nb 0.2-2.5%, W 0.5-5%, Cu 1.5-4%, Mn0.5-1%, S<0.005%, P<0.02%, N<0.01%, and I Amount of Fe; optionally, including: Si0-0.5% and B0-0.1%.

[0041] The second step, hot rolling: remove the oxide skin on the surface of the billet, heat to 1150-120...

Embodiment 1

[0046] The element composition (mass fraction) of the austenitic heat-resistant stainless steel of this embodiment is: 0.081%C, 0.29%Si, 0.78%Mn, 0.01%P, 0.002%S, 14.81%Cr, 25.81%Ni, 2.83%Al , 2.64% Cu, 0.44% Nb, 2.47% W, 0.0007% B, 0.002% N and the rest are Fe.

[0047] The preparation method of the austenitic heat-resistant stainless steel of the present embodiment is:

[0048] (1) Forging: The element composition (mass fraction) is 0.081%C, 0.29%Si, 0.78%Mn, 0.01%P, 0.002%S, 14.81%Cr, 25.81%Ni, 2.83%Al, 2.64%Cu, 0.44% %Nb, 2.47%W, 0.0007%B, 0.002%N and the rest being Fe are heated to 1150-1200°C, held for 60 minutes (the maximum section length of the slab is 100mm), forged into billets, and air-cooled after forging ;

[0049] (2) Hot rolling: Remove the surface scale of the billet, heat it to 1150-1200°C, keep it warm for 120min (the maximum section length of the billet is 220mm), and then start hot rolling. The starting rolling temperature is about 1100°C, and the final ...

Embodiment 2

[0051] The element composition (mass fraction) of the austenitic heat-resistant stainless steel of this embodiment is: 0.08%C, 0.33%Si, 0.78%Mn, 0.01%P, 0.002%S, 14.99%Cr, 25.59%Ni, 2.61%Al , 2.55% Cu, 0.99% Nb, 2.22% W, 0.0007% B, 0.0008% N and the rest are Fe.

[0052] The preparation method of the austenitic heat-resistant stainless steel of the present embodiment is:

[0053] (1) Forging: The element composition (mass fraction) is 0.08%C, 0.33%Si, 0.78%Mn, 0.01%P, 0.002%S, 14.99%Cr, 25.59%Ni, 2.61%Al, 2.55%Cu, 0.99% %Nb, 2.22%W, 0.0007%B, 0.0008%N and the rest being Fe, the billet is heated to 1150-1200°C, held for 60 minutes (the maximum cross-sectional length of the billet is 100mm), forged into a billet, and then air-cooled after forging ;

[0054] (2) Hot rolling: Remove the surface scale of the billet, heat it to 1150-1200°C, keep it warm for 120min (the maximum section length of the billet is 220mm), and then start hot rolling. The starting rolling temperature is a...

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Abstract

The invention provides an austenitic heat-resistant stainless steel resistant to high temperature oxidation, which comprises: C 0.04‑0.1%, Cr 14‑17%, Ni 20‑27%, Al 2‑4%, Nb 0.2‑ 2.5%, W 0.5‑5%, Cu 1.5‑4%, Mn 0.5‑1%, S<0.005%, P<0.02%, N<0.02%, and the balance Fe. The present invention also provides a preparation method of austenitic heat-resistant stainless steel, comprising: (1) heating and keeping the cast slab warm, forging it into a billet, and then air cooling; (2) removing the scale on the surface of the billet, heating and keeping it warm, followed by hot rolling. The high-temperature oxidation-resistant austenitic heat-resistant stainless steel of the invention has excellent high-temperature tensile properties, durable creep properties and steam corrosion resistance, and can meet the manufacturing requirements of ultra-supercritical generator sets.

Description

technical field [0001] The invention belongs to the field of metallurgy. Specifically, the invention relates to a high-temperature oxidation-resistant austenitic heat-resistant stainless steel, a preparation method and application thereof. Background technique [0002] my country's energy structure has long been dominated by thermal power generation. Realizing the transformation of power generation mode to high-parameter and large-capacity units is one of the important measures to improve power generation efficiency and improve environmental pollution. High steam parameters put forward higher and more comprehensive requirements on the performance of heat-resistant materials, including: sufficient durable strength and creep rupture strength, excellent fatigue resistance and heat transfer performance, high oxidation resistance and corrosion resistance, good long-term stability of the organization. At present, the materials used for key parts of ultra-supercritical thermal pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C21D8/00C22C38/02C22C38/54
Inventor 方旭东李阳徐芳泓王剑夏焱张威赵建伟赵鸿燕
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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