Duplex stainless steel and production process thereof

A duplex stainless steel and production process technology, applied in the field of strong corrosion-resistant duplex stainless steel and its production process, can solve problems such as failure, bulky equipment, and increased costs, and achieve high strength and superior chloride ion pitting resistance.

Inactive Publication Date: 2011-04-20
何建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ordinary Ni-Cr type austenitic stainless steel currently used in China is easy to fail due to corrosion during use. In order to prolong the service life, the thickness of the steel plate is often increased, which not only makes the equipment bulky but also increases the cost.

Method used

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with specific embodiments.

[0016] High corrosion resistance and high strength dual-phase hot-rolled stainless steel strip, its weight percentage (Wt%) is: C: 0.03; Si: 0.4; Mn: 1.4; P: 0.02; S: 0.001; Cr: 22.5; Ni: 5.6; Mo: 3.0; Cu: 0.3; Al: 0.10; B: 0.0028; N: 0.150; Ti: 0.005;

[0017] In the AOD refining stage, oxygen and nitrogen are blown into the high-temperature molten steel at 1700°C to reduce the C content in molten steel through redox. In order to increase the nitrogen content in molten steel, Mo, which can reduce the activity of nitrogen, is added to the alloy composition. The Mn element makes the Wt(N) content reach 0.15-0.16%.

[0018] In the next engineering stage, the heating temperature of the heating furnace is controlled at 1330±5°C, and the heating time is 4 hours, and it is drawn out. It is forbidden to open the high-pressure water dephosphorization device before rolling; Cont...

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Abstract

The invention discloses duplex stainless steel which comprises the following components by weight percent (wt%): not more than 0.03 wt% of C (carbon), 0.4-0.7 wt% of Si (silicon), 1.4-1.7 wt% of Mn (manganese), not more than 0.03 wt% of P (phosphorus), not more than 0.001 wt% of S (sulfur), 22.3-22.7 wt% of Cr (chromium), 5.6-5.9 wt% of Ni (nickel), 3.0-3.2 wt% of Mo (molybdenum), not more than 0.5 wt% of Cu (copper), not more than 0.15 wt% of Al (aluminum), 0.0028-0.0043 wt% of B (boron), 0.145-0.175 wt% of N (nitrogen), not more than 0.005 wt% of Ti (titanium), not more than 0.99 wt% of Pb (plumbum) and the balance of Fe (ferrum). The invention further provides a production process of the duplex stainless steel with strong corrosion resistance, and the duplex stainless steel has the advantages of higher strength, more excellent chloridion pitting corrosion resistance and stress corrosion resistance; simultaneously, the production process is conductive to better product quality.

Description

technical field [0001] The invention relates to a stainless steel and its production process, in particular to a strong corrosion-resistant duplex stainless steel and its production process. Background technique [0002] With the continuous and rapid development of the domestic heavy chemical industry, the demand for industrial equipment such as petrochemical, seawater and wastewater treatment, and oil and gas pipelines has accelerated. The working conditions in these fields are very harsh, and there are various types of strong acids and alkalis, which put forward extremely high requirements for the corrosion resistance and strength of the equipment. The ordinary Ni-Cr austenitic stainless steel currently used in China is easy to fail due to corrosion during use. In order to prolong the service life, the thickness of the steel plate is often increased, which not only makes the equipment bulky but also increases the cost. Contents of the invention [0003] The technical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/58C22C33/04C21D8/00
Inventor 何建
Owner 何建
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