High-silicon nitrogen-contained austenitic stainless steel and preparing method thereof

A technology of austenitic stainless steel and stainless steel, applied in the field of alloys, can solve the problems affecting the thermal processing performance and constraints of stainless steel, achieve good cold and hot processing performance, improve corrosion resistance, improve corrosion resistance and mechanical properties

Inactive Publication Date: 2017-05-31
JIANGSU XIHU SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although increasing the silicon content in austenitic stainless steel can effectively improve the sulfuric acid corrosion resistance of stainless steel, the high silicon content seriously restricts and affects the hot workability of stainless steel. Tensitic stainless steel is especially important

Method used

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  • High-silicon nitrogen-contained austenitic stainless steel and preparing method thereof
  • High-silicon nitrogen-contained austenitic stainless steel and preparing method thereof
  • High-silicon nitrogen-contained austenitic stainless steel and preparing method thereof

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preparation example Construction

[0019] The preparation method of the high-silicon nitrogen-containing austenitic stainless steel of the present invention comprises the following steps:

[0020] Smelting ingots: Put the raw materials with a good ratio into the smelting furnace for smelting, and use nitrogen as the protective atmosphere in the furnace; when using a vacuum induction furnace for smelting, add nitrogen as the protective atmosphere after refining, and control the pressure at 0.02MPa-0.05MPa, The nitrogen element in the alloy mainly passes through the granular Si 3 N 4 High-nitrogen alloy is added; when using other nitrogen-protected atmosphere smelting equipment for smelting, the nitrogen pressure should be controlled at 0.02MPa-0.1MPa; after smelting is completed, ingots are cast;

[0021] Hot processing of steel ingot: Homogenize the steel ingot at 1050°C-1200°C for 4-10 hours to fully eliminate the high-silicon precipitates in the ingot, so that the high-silicon inclusions in the steel ingot a...

Embodiment 1

[0036] Embodiment 1: A kind of conventional high silicon stainless steel, as the comparison steel of the embodiment of the present invention, its chemical composition mass percent is: C0.021, Cr17.2, Mn1.78, Mo2.25, Ni18.1, Al≤0.02 , Si5.84, S0.0076, P0.011, balance Fe. Using conventional thermal processing technology and heat treatment process, samples are taken along the direction perpendicular to the rolling direction, and a test square sample with a plate thickness of 12mm and a size of 11mm×11mm is obtained. The mechanical properties of the sample are tested, and the mechanical properties of the sample are measured. Table 1, and samples were soaked in 90 ° 98% concentrated sulfuric acid for one day and seven days to test the corrosion rate, and the measured corrosion rate was listed in Table 2.

Embodiment 2

[0037] Embodiment 2: the high silicon nitrogen-containing austenitic stainless steel of the present invention, its chemical composition mass percent is: C0.019, Cr18.9, Mn2.63, N 0.15, Mo1.88, Cu 1.14, Ni 16.91, La0. 3, Al0.67, Si4.92, S0.0081, P0.014, the balance of Fe; smelting in a vacuum induction furnace of 1 kg, the protective nitrogen pressure is 0.01MPa, and the nitrided alloy is Si 3 N 4 , the heat processing process is: the alloy ingot is homogenized and heat treated at 1150°C ± 15°C for 4 hours, and then forged into a performance test plate in three fires. The thickness of the plate used in this example is 12mm, and the final forging temperature is 950°C; Yes: The test plate is sampled along the direction perpendicular to the processing direction, cut into 11mm×11mm test squares, solution treated at 1100°C±5°C for (1±0.1) hours, air-cooled or water-cooled to room temperature, and chromium, copper, molybdenum, Nitrogen and silicon compounds or inclusions are fully d...

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Abstract

The invention provides high-silicon nitrogen-contained austenitic stainless steel. The high-silicon nitrogen-contained austenitic stainless steel is characterized by comprising chemical compositions including, by mass percent, 15%-20% of Cr, 15%-20% of Ni, 2%-5% of Mn, 4.5%-6.0% of Si, 1%-3% of Mo, 0.5%-1.5% of Cu, 0.1%-0.3% of N, not larger than 1.0% of Al, 0.05%-0.5% of RE, not larger than 0.03% of C, not larger than 0.010% of S, not larger than 0.02% of P and the balance Fe. The invention further provides a preparing method of the above high-silicon nitrogen-contained austenitic stainless steel. The high-silicon nitrogen-contained austenitic stainless steel is mainly used for in the field of chemical engineering, in particular to the sulfuric acid industry; the high-silicon nitrogen-contained austenitic stainless steel can be further used in the fields of food catering instruments, ornaments, environmental protection and the like; and according to the high-silicon nitrogen-contained austenitic stainless steel, by optimizing the silicon content and adding the nitrogen, the copper, the aluminum and the rare earth elements, the corrosion resistance of the stainless steel is improved, and the stainless steel has the excellent cold and heat machining performance and corrosion resistance.

Description

technical field [0001] The invention relates to the field of alloys, in particular to a high-silicon-nitrogen-containing austenitic stainless steel resistant to sulfuric acid corrosion and having excellent mechanical properties and a preparation method thereof. Background technique [0002] Foreign countries began to develop and apply high-silicon austenitic stainless steel for sulfuric acid resistance since the 1980s, such as Saramet stainless steel developed in Canada, and Sandivik SX stainless steel developed in Sweden, with a silicon content of more than 6%. SX stainless steel has been widely used in the field of high-temperature concentrated sulfuric acid to manufacture appliances such as coolers and dry suction towers. In the mid-1990s, Germany developed 700Si high-silicon austenitic stainless steel, with a silicon content of more than 7%, which has excellent mechanical properties and corrosion resistance. [0003] Domestic research on high-silicon stainless steel for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/44C22C38/42C22C38/06C21D8/00
CPCC22C38/58C21D8/005C21D2211/001C22C38/001C22C38/005C22C38/06C22C38/34C22C38/42C22C38/44
Inventor 翟海平任伊宾翟素萍翟世先徐华翟华平王庆
Owner JIANGSU XIHU SPECIAL STEEL
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