CN102251193A - Economical biphase stainless steel with excellent corrosion resistance and preparation method thereof - Google Patents
Economical biphase stainless steel with excellent corrosion resistance and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an economical biphase stainless steel with excellent corrosion resistance and a preparation method thereof, belonging to the technical field of steel alloy materials. The economical biphase stainless steel comprises the following components in percentage by mass: greater than 0 and less than or equal to 0.04% of C, at most 0.01% of S, at most 1.0% of Si, at most 0.015% of P, 19.0-22.0% of Cr, 1.5-2.5% of Ni, 0.5-1.5% of Mo, 0.5-1.5% of Cu, 0.15-0.25% of N, 0.001-0.01% of B, 0.005-0.20% of rare earth Ce or Y, and the balance of iron. The preparation method adopts a traditional and conventional smelting technique, and adopts a pure iron sealed tube interalloy feeding method in the feeding process, comprising the following steps: previously preparing Fe-Ce interalloy or Fe-Y interalloy; after carrying out comprehensive proportioning and smelting, casting to form, and carrying out solution treatment to finally obtain the economical biphase stainless steel with excellent corrosion resistance. The critical pitting potential of the economical biphase stainless steel with excellent corrosion resistance in a 1 mol/L NaCl solution at room temperature is greater than 500mv.
Description
Technical field
The present invention relates to a kind of economical high-performance diphase stainless steel and preparation method thereof, belong to steel and alloy material technology field with excellent corrosion resistance.
Background technology
Duplex stainless steel is made up of austenite and ferrite.The main component of duplex stainless steel is chromium, nickel, molybdenum, and wherein nickel is the most expensive; In order to reduce cost, reduce the content of nickel in the steel, can adopt alloying elements such as adding nitrogen, copper.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, 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 expanded the range of application of duplex stainless steel greatly.The reduction with cost of further developing along with metallurgical technology, add-on to nitrogen also can accurately be controlled, thereby new low nickel high-nitrogen super duplex stainless steel has appearred, as its nitrogen content of UNSS32750(0.25～0.35%, nickel content is about 6～8%) and its nitrogen content of UNSS32906(0.30～0.40%, nickel content is about 5.8～7.5%).Ratio by suitable chromium, nickel, molybdenum, copper and nitrogen etc. cooperates, and sophisticated thermal treatment process, chromium can improved, nitrogen, obtain ideal phase ratio when reducing nickel, molybdenum, so not only improve the mechanical property of duplex stainless steel, and its corrosion resistance also is greatly improved.In addition, because metallic nickel price volalility in recent years is very serious, the content that reduces nickel in the stainless steel helps keeping the stable of stainless steel market.So the scientific research personnel keeps the stable this respect in stainless steel market to do a large amount of explorations when improving stainless performance.
Summary of the invention
The object of the present invention is to provide a kind of low cost and have good corrosion resistance and the economical diphase stainless steel alloy material of hot workability.
Economical diphase stainless steel alloy material of the present invention is characterized in that having following composition and mass percent:
0＜C≤0.04%, S≤0.01%, Si≤1.0%, P≤0.015%, Cr:19.0～22.0%, Ni:1.5 ~ 2.5%, Mo:0.5～1.5%, Cu:0.5～1.5%, N:0.15～0.25%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
The preparation method of economical diphase stainless steel alloy material of the present invention is characterized in that: adopt the conventional smelting process of tradition, adopt pure iron seal of tube master alloy throw-in play when feeding intake, be i.e. the master alloy that need use well of prepared beforehand; Master alloy is made up of iron and rare earth metal, selects Fe-Ce or Fe-Y master alloy for use; 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 economical diphase stainless steel alloy material.Steel in this composition range is the two-phase region 850～1200 ℃ of scopes, austenite content changes about 40～60%, through certain solution treatment, the tensile break strength of room temperature is in 850～1100Mpa scope, yield strength is in 500～700Mpa scope, tension set is in 25～45% scopes, and the critical spot corrosion point position under the room temperature in the NaCl of 1mol/L solution is greater than 500mv.
Mechanism of the present invention is as described below:
Can enlarge the principle of austenitic area according to copper, the lot of experiments development is added an amount of copper and can be substituted part of nickel and reach stable austenite phase purpose; Simultaneously nitrogen can replace the action principle of nickel in steel, also can stablize austenite in the dual phase steel with proper amount of cheap nitrogen, thereby reduces the consumption of valuable nickel; And after in this double phase stainless steel alloy, adding Rare-Earth Ce or Y, sulphur content in the alloy reduces or forms dystectic rare-earth sulfide disperse greatly in matrix, avoid low melting point sulfide to be present on the phase boundary, thereby improved the high temperature thermoplasticity of steel effectively.In addition, suitable molybdenum, copper and nitrogen effectively cooperate the corrosive nature that has increased substantially this material.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
In the present embodiment, adopt the composition and the mass percent of duplex stainless steel as follows:
Cr 21.1%
Ni 2.1%
Cu 0.5%
Mo 1.0%
N 0.20%
C 0.026%
Rare-Earth Ce 0.10%
Si 0.6%
S 0.004％
P 0.012％
B 0.001%
The Fe surplus
Adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play, i.e. the good master alloy of prepared beforehand.The alloy that consists of Fe and Ce of master alloy, the quality percentage composition of Ce is 23.5% in the Fe-Ce master alloy.Calculate and after batching founded, casting finally made nitrogenous ultralow nickel duplex stainless steel alloy material through comprehensive metering.As cast condition is 1020 ℃ of solution treatment after forge hot, and its room temperature tensile breaking tenacity is greater than 1000MPa, and yield strength is greater than 600MPa, and tension set is greater than 30%, and the critical spot corrosion point position under the room temperature in the NaCl of 1mol/L solution is greater than 500mv.
Embodiment 2
In the present embodiment, adopt the composition and the weight percent of duplex stainless steel as follows:
Cr 20.5%
Ni 1.9%
Cu 1.0%
Mo 1.1%
N 0.21%
C 0.028%
Rare-Earth Ce 0.10%
Si 0.70%
S 0.002%
P 0.010%
B 0.002%
The Fe surplus
Adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play.It is the good master alloy of prepared beforehand.The alloy that consists of Fe and Ce of master alloy, the quality percentage composition of Ce is 23.5% in the Fe-Ce master alloy.Calculate and after batching founded, casting finally made the high nitrogen and low nickel duplex stainless steel alloy material through comprehensive metering.As cast condition is 1020 ℃ of solution treatment after forge hot, and its room temperature tensile breaking tenacity is greater than 900MPa, and yield strength is greater than 580MPa, and tension set is greater than 38%, and the critical spot corrosion point position under the room temperature in the NaCl of 1mol/L solution is greater than 500mv.
Embodiment 3
In the present embodiment, adopt the composition and the weight percent of duplex stainless steel as follows:
Cr 19.5%
Ni 1.8%
Mo 0.9%
Cu 1.50%
N 0.19%
C 0.024%
Rare-Earth Ce 0.10%
Si 0.60%
S 0.003%
P 0.010%
B 0.002%
The Fe surplus
Adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play.It is the good master alloy of prepared beforehand.The alloy that consists of Fe and Ce of master alloy, the quality percentage composition of Ce is 23.5% in the Fe-Ce master alloy.Calculate and after batching founded, casting finally made the high nitrogen and low nickel duplex stainless steel alloy material through comprehensive metering.As cast condition is 1020 ℃ of solution treatment after forge hot, and its room temperature tensile breaking tenacity is greater than 1000MPa, and yield strength is greater than 550MPa, and tension set is greater than 32%, and the critical spot corrosion point position under the room temperature in the NaCl of 1mol/L solution is greater than 500mv.
The resistance to corrosion of such material is roughly suitable with austenite 316 series, and mechanical property is better than austenite 316 series, can be used as aspects such as automobile, general instruments engineering, be the optimal candidate material of replacing 316 series, can reduce material cost significantly and reduce material usage.In addition, has hot workability preferably in 900～1300 ℃ of this materials.
Claims (2)
1. the economical diphase stainless steel with excellent corrosion resistance is characterized in that having following composition and mass percent: 0＜C≤0.04%, S≤0.01%, Si≤1.0%, P≤0.015%, Cr:19.0～22.0%, Ni:1.5～2.5%, Mo:0.5～1.5%, Cu:0.5～1.5%, N:0.15～0.25%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
2. by the preparation method of the described economical diphase stainless steel of claim 1, it is characterized in that: adopt conventional smelting process, adopt pure iron seal of tube rare earth intermediate alloy input when feeding intake, rare earth intermediate alloy is selected Fe-Ce or Fe-Y master alloy for use; Both compositions are respectively: the quality percentage composition of Ce is 23.5% in the Fe-Ce master alloy, and the quality percentage composition of Y is 15% in the Fe-Y master alloy; After batching was founded, casting was handled through solid solution aging again, finally makes the economical diphase stainless steel with excellent corrosion resistance.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766823A (en) * | 2012-07-17 | 2012-11-07 | 上海大学 | Duplex stainless steel with phase change plastification effect and preparation method thereof |
| CN103757559A (en) * | 2014-01-02 | 2014-04-30 | 上海大学 | Economical type duplex stainless steel with phase change plastification effect |
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| JPH0741906A (en) * | 1993-07-28 | 1995-02-10 | Nippon Yakin Kogyo Co Ltd | Superplastic two-phase stainless steel |
| CN1970815A (en) * | 2006-07-21 | 2007-05-30 | 上海大学 | Rare earth-containing high-nitrogen ultralow-nickel super-duplex stainless steel alloy materials and method for preparing same |
| CN101215674A (en) * | 2008-01-08 | 2008-07-09 | 上海大学 | Economical diphase stainless steel alloy material and preparation method thereof |
| CN101215675A (en) * | 2008-01-08 | 2008-07-09 | 上海大学 | Resource-saving diphase stainless steel alloy material and preparation method thereof |
-
2011
- 2011-07-06 CN CN 201110186788 patent/CN102251193A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0741906A (en) * | 1993-07-28 | 1995-02-10 | Nippon Yakin Kogyo Co Ltd | Superplastic two-phase stainless steel |
| CN1970815A (en) * | 2006-07-21 | 2007-05-30 | 上海大学 | Rare earth-containing high-nitrogen ultralow-nickel super-duplex stainless steel alloy materials and method for preparing same |
| CN101215674A (en) * | 2008-01-08 | 2008-07-09 | 上海大学 | Economical diphase stainless steel alloy material and preparation method thereof |
| CN101215675A (en) * | 2008-01-08 | 2008-07-09 | 上海大学 | Resource-saving diphase stainless steel alloy material and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766823A (en) * | 2012-07-17 | 2012-11-07 | 上海大学 | Duplex stainless steel with phase change plastification effect and preparation method thereof |
| CN103757559A (en) * | 2014-01-02 | 2014-04-30 | 上海大学 | Economical type duplex stainless steel with phase change plastification effect |
| CN103757559B (en) * | 2014-01-02 | 2016-08-17 | 上海大学 | There is the economical diphase stainless steel of phase transformation plasticization effect |
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Application publication date: 20111123 |