CN106636862A - Technology for smelting super duplex stainless steel for argon oxygen furnace - Google Patents
Technology for smelting super duplex stainless steel for argon oxygen furnace Download PDFInfo
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- CN106636862A CN106636862A CN201610057816.7A CN201610057816A CN106636862A CN 106636862 A CN106636862 A CN 106636862A CN 201610057816 A CN201610057816 A CN 201610057816A CN 106636862 A CN106636862 A CN 106636862A
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of smelting and mainly relates to a technology for smelting super duplex stainless steel for an argon oxygen furnace. A smelting manner for adopting an electric arc furnace or an induction furnace and the argon oxygen furnace is adopted, wherein smelted super duplex stainless steel comprises, by mass percent, smaller than or equal to 0.05% of C, 24%-26% of Cr, 6.0%-8.0% of Ni, 3.0%-4.0% of Mo, 0.5%-1.0% of W, 0.5%-1% of Cu, 0.20%-0.30% of N, 0.20%-1.0% of Si, 0.20%-1.0% of Mn and the balance Fe and a small number of other alloy elements. The technology for smelting the super duplex stainless steel for the argon oxygen furnace is high in alloy yield, stable in C and N component control, low in production cost and accurate in chemical component control.
Description
Technical field
The invention belongs to technical field of smelting, relates generally to the technique that a kind of Ar-O_2 furnace smelts super-duplex stainless steel.
Background technology
Super-duplex stainless steel, refers to spot corrosion drag equivalent（PRE）One group of two phase stainless steel more than 40, PRE=wt%Cr+
3.3(wt%Mo)+16(wt%N).Ocean engineering, desalinization, chemical industry, photo-thermal energy storage etc. are mainly used in severe corrosive
In working environment, such as desalinization pump shaft, photo-thermal energy storage pressure piping and shaft forgings.Because workpiece working environment is disliked
It is bad, it is very strict for the requirement of steel product quality, not only require there is higher comprehensive mechanical property, stronger corrosion-resistant ability,
And have strict requirements to metallographic structure, nonmetallic inclusionsin steel, grain size, mechanical property, ultrasonic examination etc..
Super-duplex stainless steel has strong σ and M2The trend that the precipitated phases such as N are separated out, to avoid separating out, typically can be by closing
The constituent adjustment and rational heat treating regime of gold is solving.When two-phase proportion close 1 in super duplex steel：When 1, material has
Preferable mechanical property and decay resistance.Therefore, to control two-phase structure's ratio and avoiding the precipitated phases such as σ and M2N from separating out,
Chemical composition, especially N compositions need to accurately be controlled.
S32760 super-duplex stainless steels, are earliest to be developed by Mather and Platt Ltd companies of Britain, in the eighties
Mid-term occurs i.e. in the form of foundry goods, and it has the advantage of high temperature resistant seawater and halogen-containing medium, is by its development evolvement progressively
Malleability super-duplex stainless steel.
For super-duplex stainless steel, material introduces later, so far GB/T1220-2007 standards, without corresponding steel for the country
Plant corresponding, for super-duplex stainless steel, C, N chemical composition is wayward, accurately control even more difficulty is larger.
Patent document CN101476078A discloses the manufacture method of super two-phase stainless steel large-sized sea water pump shaft, adopts
VOD is smelted, and nitrided ferro-chromium adjustment N content is added before tapping；Because N content is relatively low and unstable in nitrided ferro-chromium, cause N
Rate of recovery extremely unstable, causes the control of super-duplex stainless steel N content unstable, easily causes super-duplex stainless steel two to compare
Example is unstable, so as to cause product rejection.In addition nitrided ferro-chromium alloy price is higher, for comparing cheap nitrogen, does not have into
This advantage.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency of the prior art to provide a kind of yield of alloy height, C and N compositions
Control is stable, the technique that low production cost and the accurate Ar-O_2 furnace of chemical Composition Control smelt super-duplex stainless steel.
The technical scheme is that what is be achieved in that：A kind of Ar-O_2 furnace smelts the technique of super-duplex stainless steel, adopts
Electric arc furnaces or induction furnace+Ar-O_2 furnace smelt mode；The super-duplex stainless steel composition of smelting is by mass percentage：C is not more than
0.05%, Cr=24% ~ 26%, Ni=6.0 ~ 8.0%, Mo=3.0 ~ 4.0%, W=0.5 ~ 1.0%, Cu=0.5 ~ 1.0%, N=0.20 ~
0.30%, Si=0.20 ~ 1.0%, Mn=0.20 ~ 1.0%, balance of Fe and a small amount of other alloying elements.
W, Cu alloy is added in the Ar-O_2 furnace decarburization later stage, and using nitrogen the alloying of nitrogen is carried out.
Processing step is as follows：
Step one：Just refining：Furnace charge is made up of low-phosphorous carbon, conjunction knot steel, stainless steel stub bar and Ni, Mo alloy, in electric arc furnaces or sensing
Just refining in stove, takes complete analysis sample after furnace charge fine melt, temperature, composition are tapped after meeting the requirements, and are blended into Ar-O_2 furnace；
Step 2：The Ar-O_2 furnace heat of oxidation：Ar-O_2 furnace is converted and the lime for accounting for molten steel amount 2～3% is added in steel forehearth；Ar-O_2 furnace is opened and blows temperature
>=1500 DEG C of degree, mixed carbon comtent：2.0～3.0%；Early stage is blown into pure oxygen and carries out decarburization, heats up；Temperature >=1600 DEG C, be blown into oxygen,
Nitrogen mixed gas 3:1 carries out decarburization, heats up；When molten steel temperature >=1680 DEG C, [C]≤0.20%, oxygen, nitrogen mixing are blown into
Gas 1:1 carries out decarburization, heats up, and adds W, Cu alloy；When molten steel temperature >=1720 DEG C, [C]≤0.06%, oxygen, nitrogen are blown into
Mixed gas 1:3 carry out decarburization, heat up；When [C]≤0.01%, blow off oxygen, change nitrogen blowing, add ferrosilicon, wherein aluminium ingot, silicon
Iron 15～30Kg/ tons, aluminium ingot 2～5Kg/ tons, 4～8 minutes time carries out prereduction；Take complete analysis sample and skim to seeing molten steel；
Step 3：Ar-O_2 furnace reduction period：Lime, fluorite, aluminium ingot, wherein 15～30Kg/ of lime consumption tons, fluorite is added to account for lime
Weight 1/10～1/5, aluminium ingot 2～5Kg/ tons, Argon is stirred 2～3 minutes and the argon gas stirring afterwards of nitrogen flushing 2～3 minutes 0.5～
Deoxidation and nitrogen pick-up, and evening chemical composition are carried out within 1 minute, complete analysis sample is taken；1580～1620 DEG C of tappings of temperature；
Step 4：Steel is gone out, static ingot, electroslag remelting electrode billet or continuous casting billet has been poured into Jing after the weak stirring of argon gas.
The good effect that technical scheme is produced is as follows：Using Ar-O_2 furnace（AOD）Smelt production super duplex not
Rust steel is smelted than VOD and is more beneficial for realizing large-scale industrial production, and production efficiency height, low cost, stable operation, technique are easy
Grasp.Ferrochrome all adopts high carbon ferro-chrome, and W, Cu alloy is in Ar-O_2 furnace（AOD）The decarburization later stage adds, and is entered by being blown into nitrogen
Row nitrogen alloying, yield of alloy is high, and chemical Composition Control is accurate, low production cost.
Specific embodiment
A kind of Ar-O_2 furnace smelts the technique of super-duplex stainless steel, using 8 tons of Ar-O_2 furnaces（AOD）Smelt super duplex stainless
Steel S32760, technological process is：It is quick that 6 tons of intermediate frequency furnace smelting → AOD refine → pour into a mould 2 3.4t electrode billets → electrode billets
Air cooling after the demoulding.
W, Cu alloy is added in the Ar-O_2 furnace decarburization later stage, and using nitrogen the alloying of nitrogen is carried out.
Processing step is as follows：
Step one：Just refining：Allocate carbon steel stub bar 3120kg, high carbon ferro-chrome 3000kg just refining, furnace charge in electric arc furnaces or induction furnace into
Complete analysis sample is taken after fine melt, temperature, composition are tapped after meeting the requirements, melting down rear tapping is blended into Ar-O_2 furnace；
Step 2：The Ar-O_2 furnace heat of oxidation：Ar-O_2 furnace is blended into molten steel 6400kg being blended into before molten steel into stove addition 200kg lime；
Convert oxygen after steel：Nitrogen=560m3/h：135m3/h blows, and decarburization, hyperthermic treatment are carried out in AOD furnace, and period adds lime 400kg
And the alloy that needs are added；When molten steel temperature >=1680 DEG C, [C]≤0.20%, oxygen is adjusted：Nitrogen=350m3/h：350m3/h blows
Refining, period adds lime 200kg；When molten steel temperature >=1720 DEG C, [C]≤0.06%, W, Cu alloy is added, adjust oxygen：Argon=
160m3/h：480m3/h blows；When [C]≤0.01%, temperature are at 1700～1740 DEG C, into prereduction stage.Plus ferrosilicon
350kg, aluminium 18.5kg argon gas change nitrogen gas stirring 5 minutes after stirring 2 minutes, and afterwards again argon gas is stirred two minutes, is skimmed, and is now taken
Sample analyzes N：0.18%, finely tune other compositions, nitrogen gas stirring nitrogen pick-up in 3 minutes, now sample analysis N：0.31%；
Step 3：Ar-O_2 furnace reduction period：Add reduction slag charge and aluminium 90kg, micro- chromium 170kg, molybdenum-iron 35kg, lime 100kg, firefly
Stone 20kg, nitrogen gas stirring 3 minutes, afterwards straight argon gas agitating 1 minute, accurate adjustment composition and N content, now sample N：0.29%, nitrogen
30 seconds, argon gas stirring in 1 minute, 1600 DEG C of temperature prepares tapping；
Step 4：Steel is gone out, static ingot, electroslag remelting electrode billet or continuous casting billet, bull ladle has been poured into Jing after the weak stirring of argon gas
Pouring temperature is 1550 DEG C, and electrode billet adds carbon-less protecting slag, is cast for 3.4 tons of electrode billets two.
Designing chemical composition and smelting endpoint chemical composition（Mass percent, %）
The present invention smelts the super-duplex stainless steel for after implementing, and two-phase proportion is close to 1:1, N content 0.28%（Desired value
0.27%）, PRE=41.75（Require >=40）, meet the requirement of industrialized production super-duplex stainless steel.
Claims (3)
1. the technique that a kind of employing Ar-O_2 furnace smelts super-duplex stainless steel, it is characterised in that：Using electric arc furnaces or induction furnace+argon
Oxygen stove smelts mode；The super-duplex stainless steel composition of smelting is by mass percentage：C≤0.05%, Cr=24% ~ 26%, Ni=
6.0 ~ 8.0%, Mo=3.0 ~ 4.0%, W=0.5 ~ 1.0%, Cu=0.5 ~ 1.0%, N=0.20 ~ 0.30%, Si=0.20 ~ 1.0%, Mn=0.20
~ 1.0%, balance of Fe and a small amount of other alloying elements.
2. the technique that a kind of employing Ar-O_2 furnace according to claim 1 smelts super-duplex stainless steel, it is characterised in that：
W, Cu alloy is added in the Ar-O_2 furnace decarburization later stage, and using nitrogen the alloying of nitrogen is carried out.
3. the technique that a kind of employing Ar-O_2 furnace according to claim 1 smelts super-duplex stainless steel, it is characterised in that：Work
Skill step is as follows：
Step one：Just refining：Furnace charge is made up of low-phosphorous carbon, conjunction knot steel, stainless steel stub bar and Ni, Mo alloy, in electric arc furnaces or sensing
Just refining in stove, takes complete analysis sample after furnace charge fine melt, temperature, composition are tapped after meeting the requirements, and are blended into Ar-O_2 furnace；
Step 2：The Ar-O_2 furnace heat of oxidation：Ar-O_2 furnace is converted and the lime for accounting for molten steel amount 2～3% is added in steel forehearth；Ar-O_2 furnace is opened and blows temperature
>=1500 DEG C of degree, mixed carbon comtent：2.0～3.0%；Early stage is blown into pure oxygen and carries out decarburization, heats up；Temperature >=1600 DEG C, be blown into oxygen,
Nitrogen mixed gas 3:1 carries out decarburization, heats up；When molten steel temperature >=1680 DEG C, [C]≤0.20%, oxygen, nitrogen mixing are blown into
Gas 1:1 carries out decarburization, heats up, and adds W, Cu alloy；When molten steel temperature >=1720 DEG C, [C]≤0.06%, oxygen, nitrogen are blown into
Mixed gas 1:3 carry out decarburization, heat up；When [C]≤0.01%, blow off oxygen, change nitrogen blowing, add ferrosilicon, wherein aluminium ingot, silicon
Iron 15～30Kg/ tons, aluminium ingot 2～5Kg/ tons, 4～8 minutes time carries out prereduction；Take complete analysis sample and skim to seeing molten steel；
Step 3：Ar-O_2 furnace reduction period：Lime, fluorite, aluminium ingot, wherein 15～30Kg/ of lime consumption tons, fluorite is added to account for lime
Weight 1/10～1/5, aluminium ingot 2～5Kg/ tons, Argon is stirred 2～3 minutes and the argon gas stirring afterwards of nitrogen flushing 2～3 minutes 0.5～
Deoxidation and nitrogen pick-up, and evening chemical composition are carried out within 1 minute, complete analysis sample is taken；1580～1620 DEG C of tappings of temperature；
Step 4：Steel is gone out, static ingot, electroslag remelting electrode billet or continuous casting billet has been poured into Jing after the weak stirring of argon gas.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107245637A (en) * | 2017-06-26 | 2017-10-13 | 永兴特种不锈钢股份有限公司 | A kind of AOD smelts the method and a kind of AOD furnace of high manganese stainless steel |
| CN107829029A (en) * | 2017-11-10 | 2018-03-23 | 洛阳双瑞特种装备有限公司 | A kind of ZG022Cr22Ni5Mo3N materials two phase stainless steel smelting process method |
| CN109055661A (en) * | 2018-09-14 | 2018-12-21 | 中航上大高温合金材料有限公司 | A kind of production technology of low-phosphorous stainless steel |
| CN109554614A (en) * | 2018-12-26 | 2019-04-02 | 无锡市优工精密阀门有限公司 | A kind of formula of bidirectional stainless steel pump case |
| CN110541060A (en) * | 2019-10-08 | 2019-12-06 | 安徽富凯特材有限公司 | Nitrogen control method for stainless steel AOD smelting |
| CN111893370A (en) * | 2020-07-09 | 2020-11-06 | 洛阳双瑞特种装备有限公司 | Preparation method of high-nitrogen double-phase stainless steel for high-humidity and high-heat marine environment |
| CN113136523A (en) * | 2021-04-26 | 2021-07-20 | 河南中原特钢装备制造有限公司 | Process for smelting nitrogen-containing duplex stainless steel in argon-oxygen furnace |
| CN113278871A (en) * | 2021-04-29 | 2021-08-20 | 共享铸钢有限公司 | Smelting method of super duplex stainless steel |
| CN113737095A (en) * | 2021-08-30 | 2021-12-03 | 温州瑞银不锈钢制造有限公司 | High-strength corrosion-resistant duplex stainless steel, and preparation method and application thereof |
| CN113981304A (en) * | 2021-09-30 | 2022-01-28 | 江西宝顺昌特种合金制造有限公司 | Production method for smelting F55 dual-phase steel by intermediate frequency furnace |
| CN114015889A (en) * | 2021-10-19 | 2022-02-08 | 河南中原特钢装备制造有限公司 | Nitrogen-filled electroslag process for hollow billet cavity of nitrogen-containing steel |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107245637A (en) * | 2017-06-26 | 2017-10-13 | 永兴特种不锈钢股份有限公司 | A kind of AOD smelts the method and a kind of AOD furnace of high manganese stainless steel |
| CN107245637B (en) * | 2017-06-26 | 2019-04-12 | 永兴特种不锈钢股份有限公司 | A kind of AOD smelts the method and a kind of AOD furnace of high manganese stainless steel |
| CN107829029A (en) * | 2017-11-10 | 2018-03-23 | 洛阳双瑞特种装备有限公司 | A kind of ZG022Cr22Ni5Mo3N materials two phase stainless steel smelting process method |
| CN109055661A (en) * | 2018-09-14 | 2018-12-21 | 中航上大高温合金材料有限公司 | A kind of production technology of low-phosphorous stainless steel |
| CN109554614A (en) * | 2018-12-26 | 2019-04-02 | 无锡市优工精密阀门有限公司 | A kind of formula of bidirectional stainless steel pump case |
| CN110541060A (en) * | 2019-10-08 | 2019-12-06 | 安徽富凯特材有限公司 | Nitrogen control method for stainless steel AOD smelting |
| CN111893370A (en) * | 2020-07-09 | 2020-11-06 | 洛阳双瑞特种装备有限公司 | Preparation method of high-nitrogen double-phase stainless steel for high-humidity and high-heat marine environment |
| CN113136523A (en) * | 2021-04-26 | 2021-07-20 | 河南中原特钢装备制造有限公司 | Process for smelting nitrogen-containing duplex stainless steel in argon-oxygen furnace |
| CN113278871A (en) * | 2021-04-29 | 2021-08-20 | 共享铸钢有限公司 | Smelting method of super duplex stainless steel |
| CN113737095A (en) * | 2021-08-30 | 2021-12-03 | 温州瑞银不锈钢制造有限公司 | High-strength corrosion-resistant duplex stainless steel, and preparation method and application thereof |
| CN113981304A (en) * | 2021-09-30 | 2022-01-28 | 江西宝顺昌特种合金制造有限公司 | Production method for smelting F55 dual-phase steel by intermediate frequency furnace |
| CN114015889A (en) * | 2021-10-19 | 2022-02-08 | 河南中原特钢装备制造有限公司 | Nitrogen-filled electroslag process for hollow billet cavity of nitrogen-containing steel |
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Application publication date: 20170510 |
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| WD01 | Invention patent application deemed withdrawn after publication |