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Austenitic stainless steel, fine-grain large-specification bar and preparation method and application of fine-grain large-specification bar

An austenitic stainless steel, large-scale technology, applied in the field of metal materials, can solve the problems of low tensile strength, unsatisfactory, easy mixed crystals, etc., to achieve the effect of satisfying long life, increasing manufacturing cost and ensuring stability

Pending Publication Date: 2021-06-01
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although ultra-low carbon austenitic stainless steel has good corrosion resistance, it also has the defects of low tensile strength, coarse grains and mixed crystals. These problems are particularly prominent in the production process of large-scale bars, which cannot meet the requirements of industrial The world, especially the long life and high reliability requirements of large-scale structural components in the aerospace field

Method used

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  • Austenitic stainless steel, fine-grain large-specification bar and preparation method and application of fine-grain large-specification bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) The electric furnace (EF+AOD+LF)+electroslag remelting smelting process was used to obtain a Φ550mm stainless steel ingot, and the chemical composition is shown in Table 1;

[0037] 2) Heating the obtained ingot to 1200±20°C, holding it for 8 hours, and performing billet forging on a 4000-ton fast forging machine to obtain a 350mm octagonal intermediate forging billet;

[0038] 3) Heat the 350mm octagonal intermediate forging billet to 1150±20°C, keep it warm for 3 hours, and forge it on a 1300-ton radial forging machine to obtain a large-size bar of Φ160mm;

[0039] 4) Heat the Φ160mm forged bar to 900±20°C, keep it warm for 3 hours, and cool it to room temperature with water to obtain a fine-grained large-scale bar;

[0040] 5) The Φ160mm forged bar was tested for mechanical properties and grain size, and the results are shown in Table 2.

Embodiment 2

[0042] 1) The smelting process of electric furnace (EF+AOD+LF) was adopted to obtain 2.3 tons of stainless steel ingots, and the chemical composition is shown in Table 1;

[0043] 2) Heating the obtained ingot to 1250±20°C, holding it for 4 hours, and performing billet forging on a 2000-ton fast forging machine to obtain a 280mm octagonal intermediate forging billet;

[0044] 3) Heat the 280mm octagonal intermediate forging billet to 1100±20°C, keep it warm for 3 hours, and roll it on the rolling mill to obtain a large-size bar with a diameter of Φ100mm;

[0045] 4) Heat the Φ100mm rolled bar to 1080±20°C, keep it warm for 0.2 hours, and air-cool to room temperature to obtain fine-grained large-scale bars;

[0046] 5) The Φ100mm forged bar was tested for mechanical properties and grain size, and the results are shown in Table 2.

Embodiment 3

[0048] 1) The electric furnace (EF+AOD+LF)+electroslag remelting smelting process was used to obtain a Φ510mm stainless steel ingot, and the chemical composition is shown in Table 1;

[0049] 2) Heating the obtained ingot to 1250±20°C, holding it for 4 hours, and performing billet forging on a 2000-ton fast forging machine to obtain a 250mm octagonal intermediate forging billet;

[0050] 3) Heat the 250mm octagonal intermediate forging billet to 1050±20°C, keep it warm for 3 hours, and forge it on a 1300-ton diameter forging machine to obtain a large-sized bar with a diameter of Φ130mm;

[0051] 4) Heat the Φ130mm forged bar to 1000±20°C, keep it warm for 0.2 hours, and cool it to room temperature with water to obtain a fine-grained large-scale bar;

[0052] 5) The Φ130mm forged bar was tested for mechanical properties and grain size, and the results are shown in Table 2.

[0053] Chemical composition (mass percentage) of austenitic stainless steel in table 1 embodiment of th...

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Abstract

The invention discloses austenitic stainless steel. The stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.030% of C, less than or equal to 0.01% of S, less than or equal to 0.02% of P, less than or equal to 1.00% of Si, less than or equal to 2.00% of Mn, 0.14-0.22% of N, 17.50-19.50% of Cr, 9.50-12.50% of Ni, and the balance Fe and other inevitable impurities. The invention further discloses a large-specification bar prepared from the stainless steel and a preparation method and application of the large-specification bar, the austenitic stainless steel large-specification bar with the diameter not smaller than 100 mm has good intergranular corrosion resistance, the tensile strength is not lower than 600 MPa, and the grain size can reach the level 6 or even finer. The austenitic stainless steel large-specification bar can be applied to the aerospace field with high requirements for strength, toughness and corrosion resistance, and can also be applied to the fields of petroleum, chemical engineering, energy and power.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to an austenitic stainless steel fine-grained large-scale rod and a preparation method thereof. Background technique [0002] Austenitic stainless steel came out in Germany in 1913 and has always played the most important role in stainless steel. Its production and usage account for about 70% of the total production and usage of stainless steel. The early austenitic stainless steel is mainly 18-8 type Cr-Ni austenitic stainless steel, that is, the content of Cr in austenitic stainless steel is about 18%, and the content of Ni is 8% austenitic stainless steel, referred to as 18-8 steel. Its characteristic is that the carbon content is less than 0.1%, and the single-phase austenite structure is obtained by combining Cr and Ni. Because of its excellent corrosion resistance, good mechanical properties and processing properties, it is widely used in aerospace, petrochemical and nuclear p...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/02C22C33/04C21D8/06C21D1/18
CPCC22C38/58C22C38/02C22C38/002C22C38/001C22C33/04C21D8/065C21D1/18
Inventor 徐锋徐松乾赵欣郭明明
Owner 宝武特种冶金有限公司
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