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Duplex stainless steel master alloy and preparation method thereof

A duplex stainless steel and master alloy technology, which is applied in the field of high-performance stainless steel master alloy and its preparation, duplex stainless steel master alloy and its preparation, can solve the problems of unsatisfactory mechanical properties and characteristics, and achieve the improvement of toughness and strength. Effect of low mechanical properties and brittle transition temperature

Inactive Publication Date: 2013-12-25
广东华鳌合金新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this duplex stainless steel has better high temperature forming, its mechanical properties are still not ideal, especially strength and plasticity (elongation)

Method used

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  • Duplex stainless steel master alloy and preparation method thereof
  • Duplex stainless steel master alloy and preparation method thereof
  • Duplex stainless steel master alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0024] Embodiment 1-4 (without adding trace elements)

[0025] In the vacuum induction furnace, each of Examples 1, 2, and 3 was completed, and each 25 kg steel ingot was smelted.

Embodiment 1

[0026] Example 1 and Example 2 are deformed by thermal processing at 1080°C, Example 3 is cast state, Example 4 is non-vacuum intermediate frequency melting, the chemical composition of the mother liquor is controlled by AOD, and then horizontal continuous casting is performed to form a round rod with a diameter of 100mm (as-cast structure).

[0027] According to GB / T20123-2006 analysis: carbon (C); according to GB / T20124-2006 analysis: nitrogen (N); according to GB / T11170-2008 analysis: Cr, Mn, Mo, Ni, S, P, Si. Mechanics and mechanical properties are tested according to GB / T2281-2010, and the mechanical properties of the four examples are tested after heating at 1050°C-1100°C, quenching, and solution heat treatment.

[0028] The test results are shown in Table 1

[0029] Table 1

[0030] element Example 1 Example 2 Example 3 Example 4 C 0.04 0.05 0.07 0.08 Si 2.53 2.60 3.01 3.34 mn 2.73 3.09 3.78 4.01 Cr 23.56 24.89 25.53 ...

Embodiment 5-10

[0031] Embodiment 5-10 (addition of trace elements)

[0032] The chemical composition of Example 4 is selected, and its size is a round rod with a diameter of 100 mm. The process is a duplex stainless steel master alloy produced by a non-vacuum intermediate frequency furnace + AOD blowing + horizontal continuous casting. Add trace elements and remelt into Example 5, Example 6 (modified form) and Example 7, Example 8 (cast state)

[0033] Similarly, the chemical composition and mechanical properties of Example 5, Example 6, Example 7, and Example 8 were analyzed by testing the methods of Examples 1-4 and standard detection.

[0034] The test results are shown in Table 2

[0035] Table 2

[0036] element Example 5 Example 6 Example 7 Example 8 C 0.08 0.08 0.09 0.10 Si 3.01 3.10 3.21 3.15 mn 4.01 4.12 4.08 4.30 Cr 25.01 25.24 25.50 25.07 Ni 5.78 5.49 5.86 5.64 Cu 2.10 2.22 2.31 2.19 N 0.21 0.25 0.22 0...

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Abstract

The embodiment of the invention provides a duplex stainless steel master alloy and a preparation method thereof. The duplex stainless steel master alloy comprises the following components in weight percentage: 0.04-0.15% of C, 2.5-3.5% of Si, 2.0-6.0% of Mn, 17.5-27.5% of Cr, 4.0-8.0% of Ni, 2.0-3.0% of Cu, 0.5-3.0% of Mo, 0.15-0.50% of N, 0.60-1.20% of Nb, 0.5-1.0% of Ti, 0.5-1.5% of W, and the balance of Fe and unavoidable impurities. The duplex stainless steel master alloy disclosed by the invention is resistant to various forms of corrosion under different use conditions, has higher mechanical properties, is improved in mechanical properties such as tensile strength (sigma b) and elongation percentage (delta 5%) as compared with common commercial duplex stainless steel (such as WNr1.4462 of the Germany and S31803 of the USA), and can be cast directly or made into parts for use through thermal deformation.

Description

technical field [0001] The invention relates to a high-performance stainless steel master alloy and a preparation method thereof, in particular to a duplex stainless steel master alloy and a preparation method thereof, belonging to the technical field of stainless steel alloy materials. Background technique [0002] Generally, duplex stainless steel refers to the structural steel that has both austenite and ferrite structure. These two organizations exist independently, accounting for about 50% each, and have better resistance to corrosion than pure austenitic stainless steel with a single organization; compared with ferritic stainless steel, duplex stainless steel has higher toughness, The brittle transition temperature is low, intergranular corrosion resistance and welding processability are significantly improved. Compared with traditional austenitic steels, duplex stainless steels are superior in pitting corrosion resistance and compressive strength, especially yield st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C35/00C22C38/58
Inventor 王雁和龚凤阶
Owner 广东华鳌合金新材料有限公司
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