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Duplex stainless steel with high corrosion resistance and production technology thereof

A duplex stainless steel, production process technology, applied in the direction of temperature control, etc., can solve the problems of failure, bulky equipment, increased cost, etc., to achieve high strength, excellent resistance to chloride ion pitting effect

Inactive Publication Date: 2011-06-22
李锦峰
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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 with high corrosion resistance. The duplex stainless steel comprises the following components by weight percent: 0.03% or less of C, 0.4-0.7% of Si, 1.4-1.7% of Mn, 0.03% or less of P, 0.001% or less of S, 22.3-22.7% of Cr, 5.6-5.9% of Ni, 3.0-3.2% of Mo, 0.5% or less of Cu, 0.15% or less of Al, 0.0028-0.0043% of B, 0.145-0.175% of N, 0.005% or less of Ti, 0.99% or less of Pb and the balance Fe. The invention also provides a production technology of the duplex stainless steel with high corrosion resistance. The invention has the following advantages: the stainless steel has higher strength and better chloride ion pitting resistance and stress corrosion resistance; and by adopting the production technology, higher product quality can be obtained.

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): C22C38/58C22C38/54B21B37/74C23G1/08
Inventor 李锦峰
Owner 李锦峰
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