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

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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 th

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

Example Embodiment

[0035]Example 1:

[0036]1) Using electric furnace (EF + AOD + LF) + electric slag remelting smelting process, φ550mm stainless steel ingot, chemical composition is shown in Table 1;

[0037]2) The obtained ingot is heated to 1200 ± 20 ° C, 8 hours of holding it, and seduce for 4,000 tons of fast forging machines to obtain a 350mm octagonal intermediate forging blank;

[0038]3) Heat 350mm octagonal intermediate billet to 1150 ± 20 ° C, for 3 hours, forged on a 1300-ton trailing machine, and obtain a large-specific bar of φ160 mm;

[0039]4) Heat φ160mm forging the rod to 900 ± 20 ° C, heat insulation for 3 hours, water is cooled to room temperature, and the fine crystal large-specific bar;

[0040]5) Mechanical properties and crystal granular detection of φ160 mm forging, as shown in Table 2.

Example Embodiment

[0041]Example 2:

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

[0043]2) The obtained ingot is heated to 1250 ± 20 ° C, heat insulation for 4 hours, and seizes the billet forging the 2000 ton fast forging machine to obtain a 280 mm octagonal intermediate forging blank;

[0044]3) Heat 280mm octagonal intermediate billet to 1100 ± 20 ° C, heat insulation for 3 hours, rolling a large-specific bar of φ100 mm on the mill;

[0045]4) Heat φ100mm rolling bar to 1080 ± 20 ° C, heat insulation for 0.2 hours, air cooling to room temperature, and obtains a thin crystal large-scale bar;

[0046]5) Mechanical properties and crystal granular detection of φ100mm forging, as shown in Table 2.

Example Embodiment

[0047]Example 3:

[0048]1) Using electric furnace (EF + AOD + LF) + electric slag remelting smelting process, φ510 mm stainless steel ingot, the chemical composition is shown in Table 1;

[0049]2) Heat the obtained ingot to 1250 ± 20 ° C, heat insulation for 4 hours, and subjected to die forging on a 2000 ton fast forging machine, obtaining a 250 mm octagonal intermediate forging blank;

[0050]3) Heat 250mm octagonal intermediate billet to 1050 ± 20 ° C, holding for 3 hours, forging on a 1300-ton trailing machine, and obtains a large-specific bar of φ130mm;

[0051]4) Heat φ130mm forged rod to 1000 ± 20 ° C, heat insulation for 0.2 hours, water is cooled to room temperature, and the fine crystal large-specific bar;

[0052]5) Mechanical properties and crystal granular detection of φ130 mm forging, as shown in Table 2.

[0053]Table 1 Chemical composition (mass percentage) of the citish stainless steel in the embodiment of the present invention

[0054] element CSPMn Si CrNi N Example 1 0.020.0010....

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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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