CN102296249A - Diphase stainless steel alloy material substituting tungsten for molybdenum and preparation method thereof - Google Patents
Diphase stainless steel alloy material substituting tungsten for molybdenum and preparation method thereof Download PDFInfo
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- CN102296249A CN102296249A CN 201110250793 CN201110250793A CN102296249A CN 102296249 A CN102296249 A CN 102296249A CN 201110250793 CN201110250793 CN 201110250793 CN 201110250793 A CN201110250793 A CN 201110250793A CN 102296249 A CN102296249 A CN 102296249A
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Abstract
The invention discloses a diphase stainless steel alloy material substituting tungsten for molybdenum and a preparation method thereof. The diphase stainless steel alloy material substituting tungsten for molybdenum comprises the following components in percentage by mass: 0 to 0.05 percent of carbon (C), less than or equal to 0.01 percent of sulfur (S), less than or equal to 1.0 percent of silicon (Si), less than or equal to 0.015 percent of phosphorus (P), 20.0 to 23.0 percent of chromium (Cr), 1.5 to 3.5 percent of tungsten (W), 3.0 to 5.0 percent of nickel (Ni), 0.14 to 0.20 percent of nitrogen (N), 0.001 to 0.01 percent of boron (B), 0.005 to 0.20 percent of rare earth cerium (Ce) or yttrium (Y) and the balance of ferrum (Fe). In a preparation method of the diphase stainless steel alloy material substituting tungsten for molybdenum, rare earth intermediate alloy is adopted; the Fe-Ce intermediate alloy comprises 23.5 mass percent of Ce; the Fe-Y intermediate alloy comprises 15 mass percent of Y; the traditional conventional melting process method is adopted and a pure iron tube sealing rare earth intermediate alloy throwing method is adopted during charging; and after comprehensive mixing and melting, the diphase stainless steel alloy material substituting tungsten for molybdenum is prepared by casting moulding.
Description
Technical field
The present invention relates to a kind of with tungsten for molybdenum diphase stainless steel alloy material and preparation method thereof, belong to steel and alloy material technology field.
Background technology
Duplex stainless steel is made up of austenite and ferrite.Tungsten and molybdenum all are ferrite formers, but tungsten is high temperature resistant, can form wolfram varbide with carbon in steel, improve the intensity of steel.In addition, tungsten can be strengthened the fractography granular of steel, improves the quenching temperature of steel, opposing temper softening, the trend of the grain growing in the time of can also reducing quenching in the steel.Tungsten also has a significant effect to material structure and corrosion resistance nature.In the periodic table of elements, tungsten and molybdenum belong to the element with gang, it is generally acknowledged that the useful effect of tungsten is similar with molybdenum.Tungsten can effectively improve the slit and corrosion resistant performance of duplex stainless steel, contains the super-duplex stainless steel of 2%W.S39274 compares favourably with the austenitic stainless steel S31254 that contains 6%Mo in the slit and corrosion resistant ability of briny environment.The critical crevice corrosion temperature of the S39274 steel of tungstenic can reach 90 ℃, and the S31260 steel of tungstenic does not approximately have only 55 ℃.By suitable chromium, nickel, tungsten, the ratio of nitrogen etc. cooperates, and sophisticated thermal treatment process, tungsten can improved, obtain ideal phase ratio when reducing molybdenum, so not only can obtain higher mechanical property, the new steel grade of corrosive nature, and reduce the trend of separating out of sigma phase.
In addition, because the price of metal molybdenum is approximately the twice of tungsten in recent years, and China produces tungsten big country, and the content that reduces molybdenum 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 hot workability with tungsten for molybdenum diphase stainless steel alloy material and preparation method thereof.
The present invention a kind of with tungsten for the molybdenum diphase stainless steel alloy material, have following composition and mass percent:
0＜C≤0.05%, S≤0.01%, Si≤1.0%, P≤0.015%, Cr:20.0～23.0%, W:1.5-3.5%, Ni:3.0-5.0%, N:0.14～0.20%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
The present invention is a kind of with the preparation method of tungsten for the molybdenum diphase stainless steel alloy material, adopts the conventional smelting process of tradition, adopts pure iron seal of tube master alloy throw-in play when feeding intake, and prepares the master alloy that needs usefulness in advance; 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 with tungsten for the molybdenum diphase stainless steel alloy material.Steel in this composition range is the two-phase region 800～1200 ℃ of scopes, austenite content is about 40～60% variations, and the tensile break strength of room temperature is in 750～900Mpa scope, and yield strength is in 500～600Mpa scope, tension set is in 37～50% scopes, and spot corrosion point position is more than 785mV.
Mechanism of the present invention is as described below:
Can replace the action principle of molybdenum in steel according to tungsten, a large amount of experimental studies development can be stablized ferrite in the dual phase steel with proper amount of cheap and resourceful tungsten, thereby reduce the consumption of valuable tungsten; After in this double phase stainless steel alloy, adding Rare-Earth Ce or Y simultaneously, 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.
Embodiment
In order to deepen the understanding of the present invention, the invention will be further described below in conjunction with embodiment, and following examples only are used to explain the present invention, do not constitute the qualification to protection domain of the present invention.
A kind ofly get diphase stainless steel alloy material for molybdenum with tungsten, it is characterized in that: this alloy material has following composition and mass percent: 0＜C≤0.05%, S≤0.01%, Si≤1.0% of getting, P≤0.015%, Cr:20.0～23.0%, W:1.5-3.5%, Ni:3.0-5.0%, N:0.14～0.20%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
Embodiment 1
In the present embodiment, as follows for molybdenum diphase stainless steel alloy material composition and mass percent with tungsten:
C:0.26%, S:0.004%, Si:0.3%, P:0.010%, Cr:20.0%, W:1.5%, Ni:3.0%, N:0.14%, B:0.001%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
Its preparation method is: 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 Y of master alloy, the quality percentage composition of Y is 15% in the Fe-Y master alloy.Calculate and after batching founded, casting finally made high-nitrogen ultralow-nickel super-duplex stainless steel alloy materials through comprehensive metering.As cast condition is through forge hot, hot rolling, 1050 ℃ of solution treatment afterwards, and its room temperature tensile breaking tenacity is greater than 850MPa, and yield strength is greater than 550MPa, and tension set is greater than 37%, and spot corrosion point position is greater than 785mV.
Embodiment 2
In the present embodiment, as follows for molybdenum diphase stainless steel alloy material composition and mass percent with tungsten:
C:0.35%, S:0.007%, Si:0.7%, P:0.013%, Cr:21.6 %, W:3.0 %, Ni:3.5%, N:0.18 %, B:0.004%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
Its preparation method is: 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 Y of master alloy, the quality percentage composition of Y is 15% in the Fe-Y 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 through forge hot, hot rolling, 1050 ℃ of solution treatment afterwards, and its room temperature tensile breaking tenacity is greater than 830MPa, and yield strength is greater than 500MPa, and tension set is greater than 39%, and spot corrosion point position is greater than 1000mV.
Embodiment 3
In the present embodiment, as follows for molybdenum diphase stainless steel alloy material composition and mass percent with tungsten:
C:0.05%, S:0.01%, Si:1.0%, P:0.015%, Cr:23.0%, W:3.5%, Ni:5.0%, N:0.20%, B:0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
Its preparation method is: 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 Y of master alloy, the quality percentage composition of Y is 15% in the Fe-Y 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 through forge hot, hot rolling, 1050 ℃ of solution treatment afterwards, and its room temperature tensile breaking tenacity is greater than 750MPa, and yield strength is greater than 540MPa, and tension set is greater than 42%, and spot corrosion point position is greater than 1000mV.
Claims (5)
1. one kind gets diphase stainless steel alloy material with tungsten for molybdenum, it is characterized in that: this alloy material has following composition and mass percent: 0＜C≤0.05%, S≤0.01%, Si≤1.0% of getting, P≤0.015%, Cr:20.0～23.0%, W:1.5-3.5%, Ni:3.0-5.0%, N:0.14～0.20%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
2. one kind gets diphase stainless steel alloy material with tungsten for molybdenum, it is characterized in that: this alloy material has following composition and mass percent: the C:0.26% of getting, S:0.004%, Si:0.3%, P:0.010%, Cr:20.0%, W:1.5%, Ni:3.0%, N:0.14%, B:0.001%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
3. one kind gets diphase stainless steel alloy material with tungsten for molybdenum, it is characterized in that: this alloy material has following composition and mass percent: the C:0.35% of getting, S:0.007%, Si:0.7%, P:0.013%, Cr:21.6 %, W:3.0 %, Ni:3.5%, N:0.18 %, B:0.004%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
4. one kind gets diphase stainless steel alloy material with tungsten for molybdenum, it is characterized in that: this alloy material has following composition and mass percent: the C:0.05% of getting, S:0.01%, Si:1.0%, P:0.015%, Cr:23.0%, W:3.5%, Ni:5.0%, N:0.20%, B:0.01%, Rare-Earth Ce or Y:0.005～0.20%, rest part are iron.
5. claim 1-4 is described a kind of with the preparation method of tungsten for the diphase stainless steel alloy material of molybdenum, it is characterized in that: prepare the master alloy that needs usefulness in advance; Described master alloy is made up of iron and rare earth metal, selects Fe-Ce or Fe-Y master alloy for use, and 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; Adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube rare earth intermediate alloy throw-in play; After comprehensive batching was founded, casting finally made with the diphase stainless steel alloy material of tungsten for molybdenum.
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Citations (6)
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| CN1155908A (en) * | 1995-06-05 | 1997-07-30 | 浦项综合制铁株式会社 | Duplex stainless steel, and its manufacturing method |
| EP1645650A1 (en) * | 2003-06-30 | 2006-04-12 | Sumitomo Metal Industries, Ltd. | Duplex stainless steel |
| JP2007270265A (en) * | 2006-03-31 | 2007-10-18 | Sumitomo Metal Ind Ltd | Method for manufacturing duplex stainless steel seamless pipe |
| CN101168825A (en) * | 2006-10-23 | 2008-04-30 | 宝山钢铁股份有限公司 | Diphase stainless steel with special magnetic property and manufacturing 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 |
| CN101457328A (en) * | 2009-01-04 | 2009-06-17 | 上海大学 | High chromium, high manganese and high nitrogen biphase stainless steel and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155908A (en) * | 1995-06-05 | 1997-07-30 | 浦项综合制铁株式会社 | Duplex stainless steel, and its manufacturing method |
| EP1645650A1 (en) * | 2003-06-30 | 2006-04-12 | Sumitomo Metal Industries, Ltd. | Duplex stainless steel |
| JP2007270265A (en) * | 2006-03-31 | 2007-10-18 | Sumitomo Metal Ind Ltd | Method for manufacturing duplex stainless steel seamless pipe |
| CN101168825A (en) * | 2006-10-23 | 2008-04-30 | 宝山钢铁股份有限公司 | Diphase stainless steel with special magnetic property and manufacturing 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 |
| CN101457328A (en) * | 2009-01-04 | 2009-06-17 | 上海大学 | High chromium, high manganese and high nitrogen biphase stainless steel and preparation method thereof |
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Application publication date: 20111228 |