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Austenitic stainless steel containing rare-earth element

A technology for austenitic stainless steel and rare earth elements, applied in the field of stainless steel, can solve the problems of strengthening and low strength, and achieve the effects of improving high temperature oxidation resistance, improving mechanical performance indicators, and improving performance indicators

Inactive Publication Date: 2012-01-11
INNER MONGOLIA HUAYE SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low strength of austenitic stainless steel, it is impossible to strengthen it through phase transformation, and it can only be strengthened by cold working

Method used

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  • Austenitic stainless steel containing rare-earth element
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  • Austenitic stainless steel containing rare-earth element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] The austenitic stainless steel of the present invention is prepared by using the 304 stainless steel bar and rare earth alloy produced by Taiyuan Iron and Steel as raw materials. The chemical composition and weight percentage of the austenitic stainless steel are: C 0.04%, Cr 17.1%, Mn 0.52%, Ni 8.6 %, rare earth 0.042%, Si 0.08%, P 0.019%, S 0.015%, Fe balance.

Embodiment 2

[0009] The austenitic stainless steel of the present invention is prepared by using the 304 stainless steel bar and rare earth alloy produced by Taiyuan Iron and Steel as raw materials. The chemical composition and weight percentage of the austenitic stainless steel are: C 0.03%, Cr 18.9%, Mn 0.67%, Ni 10.4 %, rare earth 0.054%, Si 0.06%, P 0.017%, S 0.016%, Fe balance.

experiment example 1

[0012] Experimental example 1: Determination of the solidification structure of stainless steel

[0013] The columnar grain domain width and central equiaxed grain domain width of the stainless steels of Example 1, Example 2 and Comparative Example 1 were observed under a microscope by metallographic corrosion method, and the results are shown in Table 1 below.

[0014] Table 1. Solidification structure of rare earth-added and 304 austenitic stainless steel

[0015] sample

[0016] It can be seen from Table 1 that after the addition of rare earths, the width of the columnar crystal region decreases, while the width of the central equiaxed crystal region increases, indicating that rare earths can improve the solidification structure of austenitic stainless steel and increase the volume fraction of equiaxed crystals.

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Abstract

The invention provides an austenitic stainless steel containing a rare-earth element, which comprises the chemical components in weight percent: not greater than 0.06 percent of carbon (C), 17.0-19.0 percent of chromium (Cr), 0.5-0.7 percent of manganese (Mn), 8.5-10.5 percent of nickel (Ni), 0.04-0.06 percent of rare-earth element, not greater than 1 percent of silicon (Si), not greater than 0.02 percent of phosphorus (P), not greater than 0.02 percent of sulfur (S) and the balance of ferrum (Fe). The austenitic stainless steel containing the rare-earth element has fewer elements, simple components and the conventional performance of common austenitic stainless steel. Moreover, columnar crystals and equiaxed crystals can be obviously refined by the addition of mischmetal, and the sheet moldability of the austenitic stainless steel is improved. Moreover, the impact performance of the austenitic stainless steel is also greatly improved, and the high-temperature oxidation resistance is also improved to a certain extent.

Description

Technical field: [0001] The invention relates to an austenitic stainless steel, in particular to the stainless steel whose comprehensive performance is improved by adding a certain amount of rare earth elements. Background technique: [0002] With the continuous development of the economy, the amount of stainless steel is increasing day by day. Austenitic stainless steel is widely used in light industry, textile, construction, transportation and food processing industries due to its mature technology and excellent comprehensive performance. However, due to the low strength of austenitic stainless steel, it is impossible to strengthen it through phase transformation, and it can only be strengthened by cold working. my country is rich in rare earth resources, and the research on the mechanism of rare earth in stainless steel has also made some progress. By adding rare earth elements to stainless steel, a certain amount of rare earth can be dissolved in the matrix, the grain b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40
Inventor 袁书强史绍斐陈国豪李亚哲
Owner INNER MONGOLIA HUAYE SPECIAL STEEL
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