CN102994903A - Duplex stainless steel with paradoxical phase proportion change and preparation method thereof - Google Patents

Duplex stainless steel with paradoxical phase proportion change and preparation method thereof Download PDF

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Publication number
CN102994903A
CN102994903A CN2012105239096A CN201210523909A CN102994903A CN 102994903 A CN102994903 A CN 102994903A CN 2012105239096 A CN2012105239096 A CN 2012105239096A CN 201210523909 A CN201210523909 A CN 201210523909A CN 102994903 A CN102994903 A CN 102994903A
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China
Prior art keywords
stainless steel
duplex stainless
paradoxical
preparation
phase proportion
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CN2012105239096A
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Chinese (zh)
Inventor
肖学山
冉庆选
刘乐
柳刚
李钧
林根文
余海峰
江来珠
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Priority to CN2012105239096A priority Critical patent/CN102994903A/en
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Abstract

The invention relates to a duplex stainless steel alloy material with paradoxical phase proportion change and a preparation method thereof, belonging to the technical field of steel alloy materials. The duplex stainless steel containing vanadium and nitrogen comprises the following components in percentage by mass: 0<C<=0.06%, Mn<=1.0%, Cu<=1.0%, 0.1%<=Si<=1.5%, P<=0.03%, S<=0.03%, Cr of 18.5-22.5%, Ni of 1.8-3.5%, V of 0.05-0.8%, N of 0.1-0.25%, Ce or Y of 0.01-0.3%, and the balance of Fe and unavoidable impurities. By adopting a traditional conventional melting technology, through comprehensive dosing and founding, the rare earth intermediate alloy is directly added before casting, and then casting molding is performed. The economical high-performance duplex stainless steel with paradoxical phase proportion change is prepared through hot forging and solid solution treatment, wherein the content of ferrite in the duplex stainless steel material is kept unchanged or trends down along with the increase of the solid solution temperature; and the duplex stainless steel has low cost and good mechanical and corrosion properties.

Description

Has duplex stainless steel of paradoxical phase ratio variation and preparation method thereof
Technical field
The present invention relates to a kind of economical high-performance diphase stainless steel with the variation of paradoxical phase ratio and preparation method thereof, belong to the steel alloy material technical field.
Background technology
Along with the raising of Chinese national economy sustained and rapid development and living standards of the people, the sharp increase of stainless apparent consumption amount.Stainless main alloying constituent is nickel, chromium and molybdenum etc., and wherein nickel and molybdenum are expensive metal, and LME-Ni and 60 molybdenum-irons price per ton (containing tax) are substantially all fluctuating tens0000 or more, and it is more than 40 ten thousand per ton that a high position reaches.China is the country of a scarce nickel, few molybdenum, poor chromium and stainless steel scrap resources scarcity, the fast lifting of stainless steel output, and the supply of raw material such as nickel, chromium and molybdenum resource has become distinct issues.Especially since two thousand four, because the stainless steel price is subjected to the lasting height of nickel valency and molybdenum valency etc. to walk and fluctuate, enterprises of producing stainless steel and market have been produced huge impact, in order to reduce cost and to reduce prices of raw and semifnished materials fluctuation to the impact in stainless steel market, force enterprises of producing stainless steel and downstream user to turn to nickeliferous molybdenum economical diphase stainless steel low or not nickeliferous molybdenum or ferritic stainless steel new-product development and production.Duplex stainless steel is comprised of austenite and ferrite, in order to reduce cost, reduces the content of nickel in the steel, can adopt alloying elements such as adding nitrogen.Along with the development of AOD, VOD refinery practice, especially can control the adding of nitrogen in the AOD stove, also promoted the exploitation of nitrogen bearing duplex stainless steel, such as its nitrogen content of 2205 steel about 0.15%.The adding of nitrogen has not only improved the anti-local corrosion performance of steel, and has solved stainless Welding Problems, makes duplex stainless steel become a kind of welding structured material, has greatly expanded the range of application of duplex stainless steel.Therefore, economical diphase stainless steel has obtained faster development in recent years, and the present invention under such background, through scientific research personnel's design and repetition test, has invented a kind of economical high-performance diphase stainless steel that the paradoxical phase ratio changes that has just.
Summary of the invention
The object of the present invention is to provide a kind of low cost and have the economical high-performance diphase stainless steel alloy material that the paradoxical phase ratio changes.
The vanadium economical high-performance diphase stainless steel alloy material that contains of the present invention is characterized in that having following composition and mass percent:
0<C≤0.06%, 0.1%≤Si≤1.5%, Mn≤1.0%, Cu≤1.0%, P≤0.03%, S≤0.03%, Cr:18.5-22.5%, Ni:1.8-3.5%, V:0.05-0.8%, N:0.1-0.25%, Ce or Y:0.01-0.3%, surplus is Fe and inevitable impurity.
The present invention contains the preparation method that vanadium paradoxical phase ratio changes economical high-performance diphase stainless steel alloy material, it is characterized in that: adopt the conventional smelting process of tradition, before casting, directly rare earth intermediate alloy is dropped into, master alloy is comprised of iron and rare earth metal, selects Fe-Ce or Fe-Y master alloy; Both compositions are respectively: the quality percentage composition of Ce is 23.5% in the Fe-Ce master alloy; The quality percentage composition of Y is 15% in the Fe-Y master alloy; After comprehensive batching was founded, casting finally made and contains the vanadium economical diphase stainless steel alloy material.Steel in this composition range is the two-phase region 850~1250 ℃ of scopes, austenite content is about 30~70% variations, and through certain solution treatment, the tensile break strength of room temperature is in 750~1200Mpa scope, yield strength is in 400~700Mpa scope, and tension set is in 25~75% scopes.
Mechanism of the present invention is as described below:
V element is as strong nitride forming element, nitride form with vanadium under low temperature solid solution treatment condition exists, raising along with solid solution temperature, vanadium nitride progressively decomposes, nitrogen is strong austenite former, and vanadium and silicon are ferrite formers, nitrogen enters the austenite phase after decomposing, vanadium enters ferritic phase, by adjusting the content of vanadium and silicon, to form ferritic ability suitable so that nitrogen strengthens austenitic formation ability and vanadium silicon, or so that nitrogen strengthens the austenitic formation ability is better than vanadium silicon and forms ferritic ability, thereby having formed the rising with solid solubility temperature, austenite and ferrite content are invariable, or austenite content progressively increases and abnormal phenomena (seeing Fig. 1) that ferrite content progressively descends, and these are fully different with the increase of solid solubility temperature rising ferrite content from present common duplex stainless steel.This is so that interval in hot-work, neoteric duplex stainless steel can keep phase proportions constant or austenite content at high temperature to increase, different from the stainless hot workability attribute of present common two-phase, this has just in time remedied the deficiency of present common dual-phase stainless steel hot processing difficulties, and neoteric duplex stainless steel has good hot workability.
Description of drawings
Fig. 1 is that the ferrite content of embodiment 3 is with the change curve of solid solubility temperature.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
In the present embodiment, adopt composition and the mass percent of duplex stainless steel as follows:
Cr 20.9%
Ni 2.5%
V 0.57%
Cu 0.6%
N 0.23%
Mn 0.8%
C 0.018%
Rare-Earth Ce 0.10%
Si 0.6%
S 0.005%
P 0.011%
The Fe surplus
Adopt the conventional smelting process of tradition, before casting rare earth intermediate alloy is directly dropped into, calculate and after batching founds through comprehensive metering, casting finally makes and contains the vanadium economical diphase stainless steel alloy material.As cast condition is after forge hot and solution treatment, and its room temperature yield strength is greater than 450MPa, and tensile break strength is greater than 1000MPa, and tension set is greater than 25%.
Embodiment 2
In the present embodiment, adopt composition and the weight percent of duplex stainless steel as follows:
Cr 20.1%
Ni 2.0%
V 0.35%
Cu 0.51%
N 0.21%
Mn 0.6%
C 0.025%
Rare-Earth Ce 0.10%
Si 0.30%
S 0.016%
P 0.010%
The Fe surplus
Adopt the conventional smelting process of tradition, before casting rare earth intermediate alloy is directly dropped into, calculate and after batching founds through comprehensive metering, casting finally makes and contains the vanadium economical diphase stainless steel alloy material.As cast condition is after forge hot and solution treatment, and its room temperature yield strength is greater than 450MPa, and tensile break strength is greater than 950MPa, and tension set is greater than 30%.
Embodiment 3
In the present embodiment, adopt composition and the weight percent of duplex stainless steel as follows:
Cr 22.2%
Ni 3.0%
V 0.22%
Cu 0.7%
N 0.17%
Mn 0.4%
C 0.027%
Rare-Earth Ce 0.10%
Si 0.50%
S 0.004%
P 0.010%
The Fe surplus
Adopt the conventional smelting process of tradition, before casting rare earth intermediate alloy is directly dropped into, calculate and after batching founds through comprehensive metering, casting finally makes and contains the vanadium economical diphase stainless steel alloy material.As cast condition is after forge hot and solution treatment, and its ferrite content is with solid solubility temperature change curve such as Fig. 1, and the room temperature yield strength of this material is greater than 500MPa, and tensile break strength is greater than 900MPa, and tension set is greater than 30%.
Such two-phase stainless steel with paradoxical phase ratio has excellent hot workability, its resistance to corrosion is roughly suitable with austenite 304 series simultaneously, and mechanical property is far above austenite 304, can be used as the aspects such as automobile, general instruments engineering, it is the optimal candidate material of replacing austenite 304 series, and its material cost only have austenite 304 near half, therefore can the decrease material cost and reduce material usage, conservation-minded society is significant to Sustainable development.In addition, this material has preferably hot workability in 900~1300 ℃, has simultaneously excellent cold-forming property.

Claims (2)

1. one kind has the duplex stainless steel that the paradoxical phase ratio changes, and it is characterized in that having following composition and mass percent: C≤0.06%, 0.1%≤Si≤1.5%, Mn≤1.0%, Cu≤1.0%, P≤0.03%, S≤0.03%, Cr:18.5-22.5%, Ni:1.8-3.5%, V:0.05-0.8%, N:0.1-0.25%, Ce or Y:0.01-0.3%, surplus is Fe and inevitable impurity.
2. preparation method with duplex stainless steel that the paradoxical phase ratio changes, it is characterized in that: adopt conventional smelting process, directly rare earth intermediate alloy is dropped into before casting, rare earth intermediate alloy is selected Fe-Ce or Fe-Y master alloy; Both compositions are respectively: the quality percentage composition of Ce is that the quality percentage composition of Y in 23.5%, the Fe-Y master alloy is 15% in the Fe-Ce master alloy; After batching was founded, casting again through forge hot, solution treatment, finally made ferrite content in the dual phase steel with the solid solubility temperature duplex stainless steel that the paradoxical phase ratio that is invariable or on a declining curve changes that raises.
CN2012105239096A 2012-12-10 2012-12-10 Duplex stainless steel with paradoxical phase proportion change and preparation method thereof Pending CN102994903A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103602914A (en) * 2013-11-15 2014-02-26 上海大学兴化特种不锈钢研究院 Economical high-performance duplex stainless steel with stable structure
CN103938115A (en) * 2014-03-03 2014-07-23 黄忠波 Double phase stainless steel alloy material
CN109777938A (en) * 2019-01-08 2019-05-21 钢铁研究总院 A kind of process improving two phase stainless steel impact flexibility

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102191440A (en) * 2011-06-01 2011-09-21 上海大学 Economical antibacterial duplex stainless steel and preparation method thereof
CN102650024A (en) * 2012-05-24 2012-08-29 宝山钢铁股份有限公司 Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102191440A (en) * 2011-06-01 2011-09-21 上海大学 Economical antibacterial duplex stainless steel and preparation method thereof
CN102650024A (en) * 2012-05-24 2012-08-29 宝山钢铁股份有限公司 Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103602914A (en) * 2013-11-15 2014-02-26 上海大学兴化特种不锈钢研究院 Economical high-performance duplex stainless steel with stable structure
CN103938115A (en) * 2014-03-03 2014-07-23 黄忠波 Double phase stainless steel alloy material
CN109777938A (en) * 2019-01-08 2019-05-21 钢铁研究总院 A kind of process improving two phase stainless steel impact flexibility
CN109777938B (en) * 2019-01-08 2020-05-26 钢铁研究总院 Process method for improving impact toughness of duplex stainless steel

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Application publication date: 20130327