CN107779788A - A kind of two phase stainless steel and its solid solution treatment process - Google Patents
A kind of two phase stainless steel and its solid solution treatment process Download PDFInfo
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- CN107779788A CN107779788A CN201711042958.7A CN201711042958A CN107779788A CN 107779788 A CN107779788 A CN 107779788A CN 201711042958 A CN201711042958 A CN 201711042958A CN 107779788 A CN107779788 A CN 107779788A
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- China
- Prior art keywords
- stainless steel
- phase stainless
- solution treatment
- solid solution
- phase
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention belongs to two-phase stainless cast steel field of material technology, and in particular to a kind of two phase stainless steel and its solid solution treatment process, the two phase stainless steel provided reduce production cost by Mn N for Ni modes, and its chemical composition and mass percent are：C≤0.03%；Si≤0.75%；Mn：2.00%~4.00%；S≤0.02%；P≤0.04%；Cr：20.5%~21.5%；Ni：1.5%~2.5%；N：0.15%~0.20%；Remainder is iron and inevitable impurity.Under as cast condition after 1150 DEG C of solution treatment 2h water quenchings, its tensile strength and corrosion resisting property will get well compared with existing austenitic stainless steel 304 and economizing type two phase stainless steel LDX 2101, while production cost is low.
Description
Technical field
The invention belongs to two-phase stainless cast steel field of material technology, is more particularly at a kind of two phase stainless steel and its solid solution
Science and engineering skill.
Background technology
Two phase stainless steel（Duplex Stainless Steel, abbreviation DSS）Refer to solid solution structure by ferrite（α）With
Austenite（γ）Composition, and less phase content is more than 30% type of stainless steel.Compared with ferritic stainless steel, two phase stainless steel
With high tenacity, low brittle transition temperature, excellent welding performance；And compared with austenitic stainless steel, two phase stainless steel has
The features such as intensity is higher, intergranular corrosion resistance, anticorrosion stress-resistant, more preferable endurance corrosive nature.
In recent years, influenceed by market economy, two phase stainless steel shows two development trends.First, give full play to two-phase
The characteristics of stainless steel high intensity, good corrosion resistance energy, develop super-duplex stainless steel, to replace the super austenitics such as 904L stainless
Steel.Second, giving full play to the resource-effective advantage of two phase stainless steel, develop economizing type two phase stainless steel.As the latter, both at home and abroad
Researcher increases cheap manganese or nitrogen content come the expensive nickel of fictitious hosts with stainless steel manufacturing enterprise by taking
And molybdenum, so as to reach the performance equal or more with other stainless steels.It is important at present as economizing type two phase stainless steel
The nickel-saving type two phase stainless steel of one of development trend, its excellent mechanical property and corrosion resisting property are built upon two-phase chemical composition
Obtain it is well balanced, zero defect and without harmful phase separate out on the basis of.If its mechanical property and decay resistance can improved
On the basis of reduce production cost, this application to resource-saving diphase stainless steel and promote there is certain effect.
The content of the invention
The technical problem to be solved in the present invention is：A kind of two phase stainless steel and its solid solution treatment process are provided to obtain performance
Excellent two phase stainless steel.
The present invention two-phase stainless composition of steel be：As mass fraction, C≤0.03%；Si≤0.75%；Mn：2.00%~
4.00%；S≤0.02%；P≤0.04%；Cr：20.5%~21.5%；Ni：1.5%~2.5%；N：0.15%~0.20%；Remainder is
Iron and inevitable impurity.
The present invention Technology for Heating Processing be：Two phase stainless steel water quenching after 1000-1200 DEG C of progress solution treatment 2h, solid solution
Processing is carried out in chamber type electric resistance furnace.
Solution treatment optimised process is：Water quenching after 1150 DEG C of solid solution 2h.
The excellent effect of the present invention：
（1）By the solution treatment to two-phase stainless steel curved beam, with the rise of solid solubility temperature, secondary austenite fades away,
Austenite gradually becomes most uniform with ferritic structure at 1150 DEG C.Therefore optimal solid solution temperature is 1150 DEG C.
（2）By the solution treatment to two-phase stainless steel curved beam, with the rise of solid solubility temperature, the hardness of material is in first to reduce
After raise and reduce trend again, tensile strength reduces trend in first raising afterwards.But reach maximum at 1150 DEG C, therefore optimal
Solid solution temperature is 1150 DEG C.
（3）By the solution treatment to two-phase stainless steel curved beam, with the rise of solid solubility temperature, the corrosion electric current density of sample
（Icorr）In falling before rear ascendant trend, the minimum at 1150 DEG C, therefore optimal solid solution temperature is 1150 DEG C.
（4）The present invention is relative to existing economizing type two phase stainless steel LDX 2101, and its Cr, Mo constituent content is relatively low, cost
About 100 yuan/ton are reduced, relative to austenitic stainless steel SUS 304, its Ni constituent content substantially reduces, about 800 yuan of cost reduction/
Ton.But it is above above-mentioned 2 kinds of stainless steels in terms of mechanics and pitting resistance, therefore alternative above-mentioned type of stainless steel is applied to
The industries such as oil ＆ gas industry, chemical fertilizer industry, bridge construction, marine industry and chemical tanker.
Brief description of the drawings
Fig. 1 is embodiment 1,2 samples metallographic structure figure after different temperatures solution treatment；A1 figures are embodiment in Fig. 1-1
Metallographic structure of 1 sample at 1000 DEG C after solution treatment；A2 figures are the sample of embodiment 2 at 1000 DEG C at solid solution in Fig. 1-1
Metallographic structure after reason；B1 figures are metallographic structure of the sample of embodiment 1 at 1050 DEG C after solution treatment in Fig. 1-2；In Fig. 1-2
B2 figures are metallographic structure of the sample of embodiment 2 at 1050 DEG C after solution treatment；C1 figures are that the sample of embodiment 1 exists in Fig. 1-3
Metallographic structure at 1100 DEG C after solution treatment；C2 figures are gold of the sample of embodiment 2 at 1100 DEG C after solution treatment in Fig. 1-3
Phase constitution；D1 figures are metallographic structure of the sample of embodiment 1 at 1150 DEG C after solution treatment in Fig. 1-4；D2 figures are real in Fig. 1-4
Apply metallographic structure of the sample of example 2 at 1150 DEG C after solution treatment；E1 figures are that the sample of embodiment 1 is solid at 1200 DEG C in Fig. 1-5
Metallographic structure after molten processing；E2 figures are metallographic structure of the sample of embodiment 2 at 1200 DEG C after solution treatment in Fig. 1-5；From
It can be seen that two kinds of tissues of ferritic phase (ɑ) and austenite phase (γ) in material be present in Fig. 1-1 to Fig. 1-5.
Fig. 2 is spot corrosion (pit) shape appearance figure after material sample corrodes in Murakami solution；A figures are real in Fig. 2-1
Apply the sample GR-1150 of example 1；B figures are the sample GR-1150 of embodiment 2；C figures are the sample of comparative example 1 in Fig. 2-2；D figures are comparative example 2
Sample.
Embodiment
For the further open rather than limitation present invention, below in conjunction with example, the present invention is described in further detail.
The present invention is by Mn-N for reducing production cost in a manner of Ni；It is entered at 1000,1050,1100,1150,1200 DEG C
Row solution treatment（Numbering is GR-1000, GR-1050, GR-1100, GR-1150, GR-1200）, solution treatment is in box resistance
Carried out in stove.
The chemical composition and heat treatment mode of two phase stainless steel of the present invention are as shown in table 1, table 2.（Embodiment 1,2 is invention
Two phase stainless steel, comparative example 1 is the two phase stainless steels of LDX 2101, and comparative example 2 is the stainless steels of SUS 304）
The different material chemical composition of table 1
The solution treatment mode of table 2 and blank size
Influence of the solid solubility temperature to two phase stainless steel microstructure mechanical property and corrosion resisting property is studied, and then determines that its is optimal
Solid solution temperature.
Influence of the solid solution temperature to metallographic structure：
The sample of different solid solubility temperatures corrode in Murakami after metallographic result such as Fig. 1.As seen from Figure 1：Through solid solution
Self-control dual phase steel micro-organization chart after processing is by canescence austenite phase（γ）, grey black ferritic phase（α）、γ2Composition.
Influence of the solid solution temperature of table 3 to mechanical property
The tensile strength of sample and Rockwell hardness reach peak value after 1150 DEG C of solution treatment.Therefore, optimal solution treatment temperature
Spend for 1150 DEG C.
Influence of the solid solution temperature of table 4 to pitting resistance
Sample I after 1150 DEG C of solution treatmentcorrFor minimum value, IcorrIts pitting resistance, I can be characterizedcorrIt is bigger, resistance to point
Corrosion can be poorer.Therefore, optimal solid solution temperature is 1150 DEG C.
Know through above-mentioned mechanical property and pitting resistance testing result, sample performance reaches optimum state at 1150 DEG C.
Therefore comparative study is carried out using GR-1150 samples when contrast properties detect.
The two phase stainless steel of table 5 contrasts with LDX 2101,304 stainless steel mechanical properties of SUS
It can be seen that embodiment sample tensile strength, hardness are maximum, mechanical property is preferable.
The two phase stainless steel of table 6 and LDX 2101, the Corrosion of Stainless Steel performance comparisons of SUS 304
It can be seen that embodiment sample corrosion electric current density is minimum, thus pitting resistance better than the two phase stainless steels of LDX 2101 and
The stainless steels of SUS 304.
Three kinds of material samples corrode in Murakami solution after pit morphology such as Fig. 2.As seen from Figure 2：Through
Two phase stainless steel point corrosion pit minimum number after 1150 DEG C of solution treatment, size is minimum, therefore its pitting resistance is optimal.
The present invention can envoy's Ni type two phase stainless steels there is excellent mechanical property and corrosion resisting property, with common two-phase stainless
Steel compared with austenitic stainless steel cost is lower, performance more preferably, have very big market application potential, can be widely applied to oil gas production
The industries such as industry, chemical fertilizer industry, bridge construction, marine industry and chemical tanker.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (3)
- A kind of 1. two phase stainless steel, it is characterised in that：Its composition as mass fraction, C≤0.03%；Si≤0.75%；Mn： 2.00%~4.00%；S≤0.02%；P≤0.04%；Cr：20.5%~21.5%；Ni：1.5%~2.5%；N：0.15%~0.20%；It is remaining Part is iron and inevitable impurity.
- A kind of 2. solid solution treatment process of two phase stainless steel as claimed in claim 1, it is characterised in that：Two phase stainless steel exists 1000-1200 DEG C carries out water quenching after solution treatment 2h, and solution treatment is carried out in chamber type electric resistance furnace.
- 3. the solid solution treatment process of two phase stainless steel according to claim 2, it is characterised in that：Two phase stainless steel is 1150 DEG C solid solution 2h after water quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711042958.7A CN107779788A (en) | 2017-10-31 | 2017-10-31 | A kind of two phase stainless steel and its solid solution treatment process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711042958.7A CN107779788A (en) | 2017-10-31 | 2017-10-31 | A kind of two phase stainless steel and its solid solution treatment process |
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| CN107779788A true CN107779788A (en) | 2018-03-09 |
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| CN201711042958.7A Pending CN107779788A (en) | 2017-10-31 | 2017-10-31 | A kind of two phase stainless steel and its solid solution treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045439A (en) * | 2021-11-19 | 2022-02-15 | 福州大学 | Titanium-containing economical duplex stainless steel and preparation method thereof |
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| CN102027147A (en) * | 2008-05-16 | 2011-04-20 | 奥托库姆普联合股份公司 | Stainless steel product, use of the product and method of its manufacture |
| CN102605284A (en) * | 2011-01-25 | 2012-07-25 | 宝山钢铁股份有限公司 | Duplex stainless steel and manufacturing method thereof |
| CN102634740A (en) * | 2012-04-27 | 2012-08-15 | 宝山钢铁股份有限公司 | High-plasticity economical duplex stainless steel and manufacturing method thereof |
| JP5288980B2 (en) * | 2008-10-02 | 2013-09-11 | 新日鐵住金ステンレス株式会社 | Duplex stainless steel with excellent impact toughness and its manufacturing method |
| CN103547695A (en) * | 2011-04-18 | 2014-01-29 | 奥托库姆普联合股份公司 | Method for manufacturing and utilizing ferritic-austenitic stainless steel |
| CN103890214A (en) * | 2011-09-07 | 2014-06-25 | 奥托库姆普联合股份公司 | Duplex stainless steel |
| CN105821346A (en) * | 2015-01-06 | 2016-08-03 | 宝钢特钢有限公司 | Resource-saving duplex stainless steel wire rod and production method thereof |
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2017
- 2017-10-31 CN CN201711042958.7A patent/CN107779788A/en active Pending
Patent Citations (7)
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| CN102027147A (en) * | 2008-05-16 | 2011-04-20 | 奥托库姆普联合股份公司 | Stainless steel product, use of the product and method of its manufacture |
| JP5288980B2 (en) * | 2008-10-02 | 2013-09-11 | 新日鐵住金ステンレス株式会社 | Duplex stainless steel with excellent impact toughness and its manufacturing method |
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| CN103547695A (en) * | 2011-04-18 | 2014-01-29 | 奥托库姆普联合股份公司 | Method for manufacturing and utilizing ferritic-austenitic stainless steel |
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Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045439A (en) * | 2021-11-19 | 2022-02-15 | 福州大学 | Titanium-containing economical duplex stainless steel and preparation method thereof |
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Application publication date: 20180309 |