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Austenitic stainless steel and preparation method thereof

A technology of austenitic stainless steel, applied in the field of austenitic stainless steel and its preparation, to achieve the effect of excellent high temperature tensile strength

Inactive Publication Date: 2015-04-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional Incoloy800 series alloys (the composition mass fraction is C≤0.1%, Si≤1.00%, Mn≤1.5%, Cr19~23%, Ni30~35%, Al0.15~0.60%, Ti0.15~0.60%, Cu ≤0.75%, P≤0.045%, S≤0.015% and the rest is Fe) although it has high high temperature tensile strength (600°C, about 443MPa), durable creep performance (600°C, 100,000 hours durable ultimate strength is about 107MPa) and high-temperature oxidation resistance (700°C, 100-hour oxidation weight gain is about 0.04mg / cm2), but it is still difficult to be fully competent for large-capacity and high-parameter generator sets on high-temperature tensile strength and durable creep performance of steel and high temperature oxidation resistance requirements

Method used

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  • Austenitic stainless steel and preparation method thereof
  • Austenitic stainless steel and preparation method thereof
  • Austenitic stainless steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The percentage composition of austenitic stainless steel: 0.077%C, 0.47%Si, 0.83%Mn, 17.84%Cr, 29.73%Ni, 0.39%Nb, 2.1%Mo, 2.73%Al, 0.0082%P, 0.0029%S, 0.016% N, 0.032% Re, 0.0086%

[0030] B, the rest is Fe. (Material 1)

[0031] The method of preparing austenitic stainless steel: heat the raw material with the above percentage composition at 1100°C for 2h, keep it warm for 30min, start forging at 1050°C, and finish forging above 950°C.

[0032] Table 1 Performance comparison between material 1 of the present invention and Incoloy800

[0033]

Embodiment 2

[0035] Chemical composition (percentage) of austenitic stainless steel: 0.1%C, 0.5%Si, 0.02%Mn, 18.37%Cr, 33%Ni, 0.2%Nb, 0.9%Mo, 2.5%Al, 0.009%P, 0.01% S, 0.15% N, 0.045% Re, 0.001% B, and the rest is Fe. (Material 2)

[0036] Table 2 Performance comparison between material 2 of the present invention and Incoloy800

[0037]

[0038] The method of preparing austenitic stainless steel: heating the raw material with the above percentage composition at 1000°C for 4h, holding it for 60min, starting forging at 1000°C, and finishing forging above 950°C.

Embodiment 3

[0040] The percentage composition (percentage) of austenitic stainless steel: 0.009%C, 0.01%Si, 1%Mn, 23%Cr, 28%Ni, 0.45%Nb, 1.5%Mo, 3.02%Al, 0.04%P , 0.0041% S, 0.013% N, 0.1% Re, 0.01% B, and the rest is Fe. (Material 3)

[0041] Table 3 Performance comparison between material 3 of the present invention and Incoloy800

[0042]

[0043] The method of preparing austenitic stainless steel: heat the raw material with the above percentage composition at 1100°C for 3 hours, hold it for 50 minutes, start forging at 1200°C, and finish forging at above 950°C.

[0044] The performance test of the austenitic stainless steel of the present invention is described: the high temperature tensile strength of the material adopts the national standard GB / T 4338-2006 "Metallic Materials-High Temperature Tensile Test Method"; the durable ultimate strength of the material adopts the national standard GB / T T 2039-1997 "Metal Tensile Creep and Durability Test Method"; the high temperature oxid...

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Abstract

The invention provides austenitic stainless steel and a preparation method thereof. The austenitic stainless steel comprises less than or equal to 0.1% of C, less than or equal to 0.5% of Si, less than or equal to 1% of Mn, 17-23% of Cr, 28-33% of Ni, 0.20-0.45% of Nb, 0.90-2.10% of Mo, 2.51-3.02% of Al, less than or equal to 0.04% of P, less than or equal to 0.01% of S, less than or equal to 0.15% of N, less than or equal to 0.1% of Re, 0.001-0.010% of B and the balance of Fe. The austenitic stainless steel has excellent high-temperature tensile strength, lasting creep resistance and high-temperature oxidation resistance, and can be widely applied to the fields of power stations, agricultural engineering, chemical engineering, food and livelihood appliances.

Description

technical field [0001] The invention belongs to the field of stainless steel, in particular to an austenitic stainless steel and a preparation method thereof. Background technique [0002] Large-capacity, high-parameter generator sets are the current development direction of power stations in the world. The steel used for power station units puts forward extremely high requirements on the high-temperature tensile strength, long-lasting creep performance and high-temperature oxidation resistance of the steel. Traditional Incoloy800 series alloys (the composition mass fraction is C≤0.1%, Si≤1.00%, Mn≤1.5%, Cr19~23%, Ni30~35%, Al0.15~0.60%, Ti0.15~0.60%, Cu ≤0.75%, P≤0.045%, S≤0.015% and the rest is Fe) although it has high high temperature tensile strength (600°C, about 443MPa), durable creep performance (600°C, 100,000 hours durable ultimate strength is about 107MPa) and high-temperature oxidation resistance (700°C, 100-hour oxidation weight gain is about 0.04mg / cm2), but i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/48C22C30/00
CPCC22C38/48C22C38/001C22C38/005C22C38/02C22C38/04C22C38/18C22C38/40C22C38/44C22C38/54
Inventor 程晓农郭顺李冬升徐桂芳
Owner JIANGSU UNIV