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Stainless steel material and preparation method thereof

A stainless steel and duplex stainless steel technology, applied in the field of stainless steel materials, can solve the problems of high nickel price and human body metal allergy, and achieve the effects of less material removal, simplified processing technology and low raw material cost

Active Publication Date: 2018-09-18
FIYTA HOLDINGS LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the composition of traditional austenitic stainless steel generally contains nickel. On the one hand, nickel is expensive, and on the other hand, it may cause metal allergy to the human body. From the perspective of raw material economy and the prevention of nickel allergy in the human body, if the stainless steel does not contain nickel, then Material economy and human compatibility will be better

Method used

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  • Stainless steel material and preparation method thereof
  • Stainless steel material and preparation method thereof
  • Stainless steel material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, Embodiment 1 of the present invention provides a kind of preparation method of stainless steel material, specifically comprises the following steps:

[0043] S1 Raw material preparation, mixing alloy powder and forming additives at a certain mixing temperature to prepare the raw materials required for subsequent forming, wherein the alloy powder contains: Cr 18-28%, Mn 15-18%, C Less than 0.25%, Si is less than 1%, N 0.3-1%, and Fe balance; the forming additive is an additive that makes the alloy powder easy to disperse, flow, form and maintain shape during the forming process.

[0044] Compared with the traditional molten steel smelting, the embodiment of the present invention preferably adopts powder metallurgy to prepare the stainless steel material. The internal crystals of powder metallurgy are very uniform, the quality is consistent, and there is no segregation phenomenon. The stainless steel produced has reliable performance and uniform...

Embodiment 2

[0060] Embodiment 2 provides a kind of preparation method of stainless steel material, comprises the following steps:

[0061] S1 raw material preparation, the alloy composition is Cr 22wt%, Mn15wt%, C less than 0.12wt%, N0.5wt%, Si0.40%, Fe balance powder, and plastic, paraffin-based forming agent at 170-200 °C for 3 hours to obtain the raw materials required for injection molding.

[0062] S2 molding, pouring the raw materials prepared in step S1 into an injection molding machine, and inject molding at a temperature of 170-200° C. and a pressure of 20-100 MPa to obtain an injection molding blank.

[0063] S3 pretreatment, the blanks formed in step S2 are respectively kept in a vacuum environment at 200°C, 400°C, 600°C, and 1200°C for a sufficient time until the forming agent is completely released.

[0064] S4 sintering, put the pretreated piece obtained in step S3 into a sintering furnace to raise the temperature, and keep it at 1320°C and 0.05MPa pure nitrogen atmosphere ...

Embodiment 3

[0068] Embodiment 3 provides a kind of preparation method of stainless steel material, comprises the following steps:

[0069] S1 raw material preparation, the alloy composition is Cr 18wt%, Mn18wt%, C 0.16wt%, N 0.7wt%, Si1.0%, the rest of Fe powder, mixed with gasoline, paraffin-based forming agent at 30 ℃ for 0.5 Hours, the raw materials needed for compression molding are obtained.

[0070] S2 forming, pouring the raw materials prepared in step S1 into a mold, molding at a temperature of 0-30°C and a pressure of 20-500MPa to obtain a molded blank.

[0071] S3 pretreatment, put the blank formed in step S2 at 600°C in a mixed gas of nitrogen and hydrogen, and keep it warm for a sufficient time until the forming agent is completely released.

[0072] S4 sintering, put the pretreated piece obtained in step S3 into a sintering furnace to raise the temperature, and keep it warm for 60 minutes at 1400°C under a mixed atmosphere of 0.05MPa nitrogen and hydrogen.

[0073] S5 heat ...

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Abstract

The invention relates to a stainless steel material and a preparation method thereof. The stainless steel material comprises the following components of, by mass percentage, 16-25% of Cr, 12-17% of Mn, less than 0.25% of C, less than 1% of Si, 0.3-0.9% of N, and the balance Fe and unavoidable impurities; the stainless steel material is nickel-free, multilayer and biphase stainless steel; the surface layer of the stainless steel is an austenite structure; and the core of the stainless steel is an austenite-ferrite biphase structure. The provided stainless steel material can be subjected to 24 hsalt mist and 24 h artificial sweat instead of being corroded, does not contain nickel and molybdenum, does not have the nickel allergy risk, is lower in raw material cost, and has the obvious advantages in aspects such as the magnetic property, simplification of a machining technology, and less material removal in the part machining process.

Description

technical field [0001] The present invention relates to the field of stainless steel materials, more specifically, it relates to a nickel-free, molybdenum-free, high-nitrogen alloy powder as a raw material, which has an austenitic structure on the surface and an austenitic core obtained through powder metallurgy technology. - A stainless steel material with a ferrite multilayer duplex structure and a preparation method thereof. Background technique [0002] According to different structures, stainless steel can generally be divided into austenitic stainless steel, ferritic stainless steel, austenitic-ferritic stainless steel, martensitic stainless steel, etc. Austenite has excellent comprehensive corrosion resistance, but austenite (γ-Fe) is weak or non-magnetic. Although ferrite (а-Fe) has good magnetic properties, its overall corrosion resistance is poor. Traditional austenitic-ferritic stainless steel generally has a structure consistent with the surface layer and the c...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/02C22C33/02
CPCC21D2211/001C21D2211/005C22C33/0285C22C38/001C22C38/02C22C38/38
Inventor 崔晓龙靳磊张峰鲍贤勇翁建寅梁梦媛
Owner FIYTA HOLDINGS LTD
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