Microalloy element Nb reinforced double-phase stainless steel and preparation method thereof

A technology of duplex stainless steel and micro-alloying, which is applied in the direction of improving process efficiency, can solve the problem of immature mechanism of duplex stainless steel, and achieve the effect of reducing manufacturing, saving cost and improving mechanical properties.

Inactive Publication Date: 2020-04-10
FUZHOU UNIV
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Problems solved by technology

[0005] Nb microalloyed ferritic steel and austenitic steel products and applications are more, but Nb microalloyed cast duplex stainless steel products and applications are few, and the mechanism of action of Nb on duplex stainless steel is relatively immature

Method used

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  • Microalloy element Nb reinforced double-phase stainless steel and preparation method thereof
  • Microalloy element Nb reinforced double-phase stainless steel and preparation method thereof
  • Microalloy element Nb reinforced double-phase stainless steel and preparation method thereof

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Embodiment Construction

[0028] The present invention is described in more detail below with embodiment. These examples are only descriptions of the best embodiments of the present invention, and do not limit the scope of the present invention in any way.

[0029] Example: Melt duplex stainless steel molten steel in an intermediate frequency induction furnace, pour the duplex stainless steel molten steel into the investment mold shell and solidify into a test rod, after the casting is cooled, carry out sand cleaning treatment, cut off the pouring cap of the casting, and cut off the test rod. rod, and then machined to obtain a ∅22mm×220mm test rod.

[0030] The chemical composition of the duplex stainless steel strengthened by the microalloying element Nb of the present invention is shown in Table 1, and the heat treatment method is shown in Table 2. (Examples 1, 2, 3, 4, and 5 are duplex stainless steels with different Nb contents prepared by adding Nb iron, and comparative example 1 is duplex stainl...

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Abstract

The invention belongs to the field of stainless steel metal materials, and particularly relates to microalloy element Nb reinforced double-phase stainless steel and a preparation method thereof. The double-phase stainless steel is prepared from components in percent by mass including smaller than or equal to 0.03% of C, smaller than or equal to 1.0% of Si, smaller than or equal to 2.0% of Mn, smaller than or equal to 0.02% of S, smaller than or equal to 0.03% of P, 21%-23% of Cr, 4.5%-6.5% of Ni, 2.5%-3.5% of Mo, 0.03%-0.05% of Nb, 0.08%-0.20% of N and the balance Fe and inevitable impurities.According to the double-phase stainless steel, a trace of Nb element is added into 2205 double-phase stainless steel, the 2205 stainless steel has more excellent mechanical performance, meanwhile, the corrosion resistance of the 2205 double-phase stainless steel is not reduced, the cost of the double-phase stainless steel can be effectively reduced, the application range of the double-phase stainless steel is widened, the preparation method is simple, and important engineering application value and remarkable economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of stainless steel metal materials, and in particular relates to a duplex stainless steel strengthened by microalloying element Nb and a preparation method thereof. Background technique [0002] With the development of my country's economy and stainless steel industry, as well as the increasing demand for stainless steel materials in various fields, my country has become a veritable stainless steel production and consumption country in the world. In recent years, the total consumption of stainless steel in my country is still increasing year by year. Due to people's emphasis on the safety of life and property, the requirements for steel quality in various fields are also getting higher and higher. Duplex stainless steel (DSS for short) is favored by people because it has better comprehensive mechanical properties and corrosion resistance than single-phase steel. Duplex stainless steel means that its solid solution st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21D1/18C21D6/00C22C38/02C22C38/04C22C38/44C22C38/48C22C38/58
CPCC21D1/18C21D6/004C21D6/005C21D6/008C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/44C22C38/48C22C38/58Y02P10/20
Inventor 向红亮王留杰
Owner FUZHOU UNIV
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