Duplex stainless steel containing rare earth elements and preparation process of duplex stainless steel

By adding rare earth elements to duplex stainless steel and controlling smelting technology, the problems of side crack defects and low material yield during thermal processing of duplex stainless steel are solved, and its purity, corrosion resistance and thermal processing performance are improved.

CN119663115APending Publication Date: 2025-03-21ZHEJIANG FUGANG METAL PROD CO LTD +1
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Patent Information

Application Number
CN202411946153.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

Duplex stainless steel is prone to edge crack defects during hot processing, has a low material yield, and high Cr content affects the thermal processing performance. The increase of N and Mn leads to a decrease in stress corrosion performance.

Method used

Duplex stainless steel containing rare earth elements is used to control the components and heat treatment conditions through specific smelting and refining processes, and add trace amounts of mixed rare earths, combined with argon protection and solid solution treatment, and refine grains and inclusions.

Benefits of technology

The purity, corrosion resistance, thermal processing performance and material yield of duplex stainless steel are significantly improved, and the elongation, impact toughness and corrosion resistance are improved, and the cost is reduced.

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Abstract

The invention discloses duplex stainless steel containing rare earth elements and a preparation process of the duplex stainless steel. The duplex stainless steel comprises the following components in percentage by weight: less than 0.04% of C, 0.2-0.8% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 22.0-27.0% of Cr, 5.0-7.0% of Ni, 3.0-4.0% of Mo, 0.24-0.32% of N, 0.002-0.005% of B, 0.05-0.10% of mischmetal and the balance of iron and other inevitable impurities. The preparation method comprises the steps of metal smelting; adding alloy for refining; mixed rare earth with the oxygen content smaller than 1000 ppm is added in batches; pouring under the protection of argon; rolling is conducted; and carrying out solution treatment. The method has the characteristics that the purity, the corrosion resistance, the hot working performance and the yield of the duplex stainless steel are improved.
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