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A kind of low-nickel high-strength duplex stainless steel material and preparation method thereof

A duplex stainless steel, high-strength technology, applied in the field of stainless steel materials, can solve the problems of low cost of duplex stainless steel materials, unsatisfactory mechanical properties, etc., and achieve high mechanical properties and corrosion resistance, important application value and promotion value , the effect of reducing production costs

Active Publication Date: 2020-10-09
SICHUAN WEIZHEN PETROCHEM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a low-nickel high-strength duplex stainless steel material and a preparation method thereof, which can effectively solve the problem that the mechanical properties in the prior art cannot meet the requirements, and the present invention produces The cost of the obtained duplex stainless steel material is lower than that of 2304 stainless steel

Method used

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  • A kind of low-nickel high-strength duplex stainless steel material and preparation method thereof

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Effect test

Embodiment 1

[0026] A low-nickel high-strength duplex stainless steel material, including the following components in mass percentage: C: 0.025%; Cr: 23.5%; Ni: 1.18%; Mo: 0.61%; Si: 0.82%; Mn: 0.87%; Cu : 1.89%; N: 0.31%, Ti: 0.11%, P: 0.023%, S: 0.002%, Al: 0.07%; the balance is Fe and unavoidable impurities; the volume fraction of ferrite in duplex stainless steel materials is 48%, the rest is austenite.

[0027] The preparation method of the above-mentioned low-nickel high-strength duplex stainless steel material comprises the following steps:

[0028] (1) Melting: According to the above chemical composition and content, the ingredients are mixed, melted in an intermediate frequency furnace, and the temperature reaches 1550°C, and molten steel is obtained by melting;

[0029] (2) Refining: Refining the molten steel obtained by smelting in an AOD furnace, the refining temperature is 1600°C, and the refining time is 2 hours, and at the same time reduce the oxygen content and hydrogen co...

Embodiment 2

[0033] A low-nickel high-strength duplex stainless steel material, including the following components in mass percentage: C: 0.021%; Cr: 23.8%; Ni: 1.03%; Mo: 0.53%; Si: 0.71%; Mn: 1.24%; Cu : 2.21%; N: 0.32%, Ti: 0.23%, P: 0.019%, S: 0.003%, Al: 0.05%; the balance is Fe and unavoidable impurities; the volume fraction of ferrite in duplex stainless steel materials is 50%, the rest is austenite.

[0034] The preparation method of the above-mentioned low-nickel high-strength duplex stainless steel material comprises the following steps:

[0035] (1) Melting: According to the above chemical composition and content, the ingredients are mixed, melted in an intermediate frequency furnace, and the temperature reaches 1560°C, and molten steel is obtained by melting;

[0036] (2) Refining: Refining the molten steel obtained by smelting in an AOD furnace, the refining temperature is 1650°C, the refining time is 2h, and at the same time reduce the oxygen content and hydrogen content in ...

Embodiment 3

[0040] A low-nickel high-strength duplex stainless steel material, including the following components in mass percentage: C: 0.026%; Cr: 24.3%; Ni: 0.55%; Mo: 0.46%; Si: 0.79%; Mn: 0.95%; Cu : 4.55%; N: 0.46%, Ti: 0.17%, P: 0.016%, S: 0.002%, Al: 0.06%; the balance is Fe and unavoidable impurities; the volume fraction of ferrite in duplex stainless steel materials is 45%, the rest is austenite.

[0041] The preparation method of the above-mentioned low-nickel high-strength duplex stainless steel material comprises the following steps:

[0042] (1) Melting: According to the above-mentioned chemical composition and content, the ingredients are mixed, melted in an intermediate frequency furnace, and the temperature reaches 1553°C, and the molten steel is melted;

[0043] (2) Refining: Refining the molten steel obtained by smelting in an AOD furnace, the refining temperature is 1688°C, the refining time is 2h, and at the same time reduce the oxygen content and hydrogen content in t...

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Abstract

The invention discloses a low-nickel and high-strength bi-phase stainless steel material and a preparation method thereof. The low-nickel and high-strength bi-phase stainless steel material is prepared from the following components in percentage by mass: 0.01-0.04% of C, 17.0-28.0% of Cr, 0.5-1.5% of Ni, 0.2-0.70% of Mo, smaller than or equal to 1.5% of Si, smaller than or equal to 2.0% of Mn, 1.50-5.00% of Cu, 0.05-0.70% of N, smaller than or equal to 0.50% of Ti and the like. The preparation method comprises the steps: blending is conducted, and the low-nickel and high-strength bi-phase stainless steel material is prepared through smelting, refining, centrifugal casting and high-temperature solid solution heat treatment. Mechanical properties of the prepared low-nickel and high-strengthbi-phase stainless steel material can meet mechanical property requirements of X2CrNiN23-4 hot-rolled stainless steel in EN 10088-2 2005 of the sheet steel / steel plate and belt material standard of European corrosion-resistant steel, and the low-nickel and high-strength bi-phase stainless steel material is low in raw material cost and more stable in comprehensive mechanical property.

Description

technical field [0001] The invention belongs to the technical field of stainless steel materials, and in particular relates to a low-nickel high-strength duplex stainless steel material and a preparation method thereof. Background technique [0002] Duplex stainless steel is widely used in industries such as petroleum and petrochemical, metallurgy, power machinery, heat exchangers, and papermaking. Higher requirements are put forward for the corrosion resistance of various acids, alkalis, salts and other media. [0003] Traditional 316 and 304 stainless steels have high nickel content and good mechanical properties, but they are difficult to use for a long time in large equipment and harsh environments. The new 2304 stainless steel has high mechanical properties and has been widely used in industry. However, 2304 stainless steel is produced by forging hot rolling and cold rolling in EN 10088-2 2005 and ASTM A789-2017. When producing orders from foreign customers, since the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C22C33/04B22D13/00C21D6/00
CPCB22D13/00C21D6/004C21D6/005C21D6/008C21D2211/001C21D2211/005C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50
Inventor 屈志王伟张志鸿
Owner SICHUAN WEIZHEN PETROCHEM EQUIP
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