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A heat-resistant austenitic stainless steel with high structural stability at 700℃

A technology of austenitic stainless steel and stability, applied in the field of heat-resistant stainless steel, can solve the problems of insufficient mechanical properties and corrosion resistance, poor structure stability, etc., and achieve excellent high-temperature mechanical properties and corrosion resistance, good processing performance, melting simple craftsmanship

Active Publication Date: 2018-01-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high temperature structure stability, mechanical properties and corrosion resistance at a high temperature of 700 ° C for the existing austenitic stainless steel due to poor structure stability. Heat-resistant austenitic stainless steel with excellent corrosion resistance and good processability

Method used

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  • A heat-resistant austenitic stainless steel with high structural stability at 700℃
  • A heat-resistant austenitic stainless steel with high structural stability at 700℃
  • A heat-resistant austenitic stainless steel with high structural stability at 700℃

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Fe 50.22 Cr 24.62 Ni 22.23 Mo 0.73 Ti 0.09 Nb 0.18 W 0.70 mn 0.78 Si 0.40 C 0.05 (wt.%) alloy

[0016] Step 1: Alloy Preparation

[0017] The composition alloy adopts high-purity components, and the elements are proportioned according to the mass percentage of the alloy composition; the proportioned mixture is smelted several times in a non-consumable vacuum arc melting furnace under the protection of Ar gas to obtain a uniform mass of about 60g alloy ingot. Then the alloy ingot is hot-rolled at 1150°C. Before the hot-rolling treatment, the alloy ingot is kept at 1150°C for 30 minutes, and then it is hot-rolled out of the furnace. The deformation amount is about 10% each time. After each pass of hot-rolling Return to the furnace for 5 minutes of heat preservation, the total amount of rolling deformation is 80%, and the thickness of the final rolled plate is 1.4mm. The hot-rolled samples were subjected to solution treatment at 1150°C / 30min, water co...

Embodiment 2

[0022] Example 2 Fe 50.56 Cr 24.68 Ni 22.28 Mo 0.73 Ta 0.34 Nb 0.18 mn 0.78 Si 0.40 C 0.05 (wt.%) alloy

[0023] Step 1: Alloy Preparation

[0024] Alloy preparation is the same as Step 1 in Example 1.

[0025] Step 2: Alloy structure and mechanical properties test

[0026] Using OM, SEM and XRD to detect the microstructure and structure of the alloy after stabilization treatment, the results show that the alloy is a single austenite structure, and more fine MC-type carbides are precipitated in the matrix; the stabilization is tested by MTS universal tensile testing machine The mechanical property parameters of the plate samples after treatment are: σ 0.2 =227MPa, σ b =545MPa, δ=54.5%.

[0027] Step 3: Study on the Stability of the Alloy Structure

[0028] In order to study the stability of the alloy structure, the stabilized sample was subjected to aging treatment at 700°C for 408 hours, and the structure was observed by OM and SEM. The results are shown in Figu...

Embodiment 3

[0029] Example 3 Fe 50.92 Cr 24.76 Ni 22.36 Mo 0.37 Zr 0.35 mn 0.79 Si 0.40 C 0.05 (wt.%) alloy

[0030] Step 1: Alloy Preparation

[0031] Alloy preparation is the same as Step 1 in Example 1.

[0032] Step 2: Alloy structure and mechanical properties test

[0033] Using OM, SEM and XRD to detect the microstructure and structure of the alloy after stabilization treatment, the results show that the alloy is a single austenite structure, and a small amount of fine MC-type carbides are precipitated in the matrix; the stabilization treatment is tested by MTS universal tensile testing machine The mechanical property parameters of the rear plate samples are: σ 0.2 =200MPa, σ b =501MPa, δ=57.1%.

[0034] Step 3: Study on the Stability of the Alloy Structure

[0035] In order to study the stability of the alloy structure, the stabilized sample was subjected to aging treatment at 700 ° C for 408 h, and the structure was observed by OM and SEM. The results are shown in Fig...

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Abstract

The invention belongs to the field of heat resistant stainless steel, and provides heat resistant austenitic stainless steel with high structure stability at 700 DEG C. The heat resistant austenitic stainless steel is prepared from the following alloy components by mass percent (wt.%): 24.0 to 28.0wt.% of Cr, 20.0 to 25.0wt.% of Ni, 0.3 to 1.2wt.% of Mo, 0.5 to 1.0wt.% of W, 0.03 to 0.05wt.% of C, Nb, Ti, Zr, Ta, less than or equal to 0.5wt.% of Si, less than or equal to 1.0wt.% of Mn and the balance of Fe, wherein (Nb+Ti+Zr+Ta) is greater than or equal to 0.2wt.% and is less than or equal to 0.7wt.%. The heat resistant austenitic stainless steel has the beneficial effects that the heat resistant austenitic stainless steel has excellent high-temperature structure stability, corrosion resistance and processing performance at 700 DEG C, sigma phases can be effectively prevented from precipitating at long-term high-temperature aging of 700 DEG C, the toughness of the alloy at high temperature is guaranteed, a melting process is simple, and the heat resistant austenitic stainless steel is hopeful to be used for fuel canning materials and structural parts in super-critical water-cooled reactors (SCWR), boiler materials of heat power stations and the like.

Description

technical field [0001] The invention belongs to the field of heat-resistant stainless steel, and relates to a heat-resistant austenitic stainless steel with high structural stability. The austenite matrix structure is stable when the steel is aged at 700°C for a long time, and can effectively inhibit the precipitation of σ phase, thereby The strength and toughness of the alloy are ensured, and it is expected to be used as fuel cladding materials, structural parts in supercritical water-cooled reactors (SCWR), and boiler materials for thermal power stations. Background technique [0002] Supercritical water-cooled reactor (SCWR) has attracted much attention due to its advantages of higher thermal efficiency, nuclear fuel utilization and economic performance. However, because its operating environment (650°C / 25MPa) is more severe than that of the existing water-cooled reactors, the current zirconium alloy cladding materials have been difficult to meet the mechanical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/02C22C38/04C22C38/48C22C38/50C22C33/04C21D8/02
CPCC21D8/0226C22C33/04C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50
Inventor 王清陈国清温冬辉唐睿张瑞谦董闯
Owner DALIAN UNIV OF TECH
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