CN107164609A - A kind of method for controlling stainless molten steel sulfur content - Google Patents
A kind of method for controlling stainless molten steel sulfur content Download PDFInfo
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- CN107164609A CN107164609A CN201710338876.0A CN201710338876A CN107164609A CN 107164609 A CN107164609 A CN 107164609A CN 201710338876 A CN201710338876 A CN 201710338876A CN 107164609 A CN107164609 A CN 107164609A
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- molten steel
- sulfur content
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- 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
- C21C7/0685—Decarburising of stainless steel
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of method for controlling stainless molten steel sulfur content, including following preparation process：1) preparation of molten steel, stainless steel material is poured into electric furnace and slightly refined, and molten steel is made；2) AOD furnace is smelted, by step 1) in obtained molten steel be blended into AOD furnace, add one-level metallurgy lime, it is 1.5 2.0 control basicity of slag, is then added into the AOD furnace after high chromium nickel plate alloy, progress oxygen decarburization processing；Phosphorus content in the molten steel is taken off to mass ratio below 0.03%, ferrosilicon is added and is reduced, after sampling, skimming, reduction slag charge is added into AOD furnace, stirring is tapped；3) LF stoves are smelted, and the molten steel from AOD furnace out is hung into LF machining positions, add the quartz sand of drying moisture so that clinker is in alkalescent, and molten steel then is fed into CaSi lines, adds carbonization rice husk, then are hung out and poured into a mould.The present invention is directed to the technical problem of the bad control of sulfur content in free cutting stainless steel of the prior art, and disclosing a kind of can accurately control the preparation method of sulfur content in stainless steel.
Description
Technical field
The present invention relates to field of iron and steel smelting, more particularly to a kind of method for controlling stainless molten steel sulfur content.
Background technology
Stainless steel with its excellent performance, corrosion resistant is antirust it is heat-resisting the characteristics of should be through being widely used in nation-building and resident day
With etc. every field.Free cutting stainless steel is to add the elements such as sulphur, lead, calcium into steel to improve the stainless steel of its cutting ability.
It is wherein the most universal to add the free cutting stainless steel of element sulphur.S and Mn in S automatic steels are combined and are formed MnS, this field trash
Worked in machining high-speed deformation as breach, chip is disconnected using stress concentration, so as to improve steel
Cutting ability.These easy element of contact can improve the cutting ability of steel, but often reduce the mechanical property and fatigue strength of steel.
MnS in S automatic steels exists because of hot rolling and cold rolling and deform as thin extension field trash.Therefore, than basic steel,
The ductility step-down of right angle orientation is flowed into hot forging with Forging Plasticity, i.e., is often produced in forging along steel flow direction
Raw crackle.Due to being dispersed with the MnS extended along rolling direction on S automatic steels, therefore the elongation percentage, section perpendicular to rolling direction are received
Shrinkage, impact value deterioration it is big, show obvious anisotropy.Therefore, make material big in the extension difference of different directions, therefore
Often cracked during cold forging.The selection of suitable S contents is very big to free machining performance impact.But S contents are higher, respectively to different
Property it is more notable, therefore should in view of with machinability improvement balance on the basis of select suitable S contents.But it is how smart
Really control S contents propose at a relatively high requirement to technique.Company summarizes by production, and have developed one kind can control stainless steel
The method of middle S contents.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of side of control stainless molten steel sulfur content
Method, to solve the technical problem that sulfur content is not easily controlled in free cutting stainless steel of the prior art；The present invention, which has, to be prepared
Technique is simple, the characteristics of control sulfur content is accurate, substantially improves the cutting ability of steel, reduces sulfur-bearing steel different directions
Extend difference.
The present invention is achieved by the following technical solutions：The invention discloses a kind of control stainless molten steel sulfur content
Method, it is characterised in that including following preparation process：
1) preparation of molten steel, stainless steel material is poured into electric furnace and slightly refined, and molten steel is made；
2) AOD furnace is smelted, by step 1) in obtained molten steel be blended into AOD furnace, add one-level metallurgy lime, control clinker
Basicity is 1.5-2.0 (CaO/SiO2), then add after Gao Ge-nickel plate alloy, carried out at oxygen decarburization into the AOD furnace
Reason；Wherein, in oxygen decarburization processing procedure, the phosphorus content in molten steel is taken off to mass ratio below 0.03%, ferrosilicon is added and enters
Row reduction, after sampling, skimming, adds reduction slag charge into AOD furnace, stirring, by temperature control at 1640-1680 DEG C, tapping；
3) LF stoves smelt, by from step 2) AOD furnace in out molten steel be hung to LF machining positions, thermometric, sampling so that in LF stoves
Temperature maintains 1660-1700 DEG C, adds the quartz sand of drying moisture so that clinker is in alkalescent, the sulfur content in sample it is big
Small to be finely adjusted again so that sulfur recovery rate maintains 70%, computational methods are：
Then the qualified molten steel of sulfur content is fed into 100-150 meter of CaSi lines, addition carbonization rice husk, after soft blow 8-10 minutes, molten steel temperature
Degree maintains 1520-1530 DEG C, then hangs out and poured into a mould.
Further, step 1) in stainless steel melting be element quality hundred in the steel of control sulphur austenitic stainless steel 303, molten steel
Point ratio is：Carbon 1.5-2.0%, silicon 0.2-0.6%, chromium 16.30-16.8%, nickel 7.5-8.0%, copper≤0.50%, surplus is
Iron.
Further, step 2) in reduction slag charge be：The mixture of superfine metallurgy lime, fluorite and fine aluminium.
Further, step 3) in alkalescent be basicity 1.6-1.8 (CaO/SiO2)。
Further, step 3) in the method for sulfur content size fine setting in sample be：When sulfur content lacks, in LF stoves
The middle sulfur content that adds carries out increasing sulphur for 26% sulphur iron；When sulfur content is excessive, increases lime in LF stoves or fine aluminium is taken off
Sulphur.
Further, in order to preferably realize optimal production, step 1) in electric furnace be 30 tonnes, the quality of molten steel discharging
For 29.5 tons；Step 2) in one-level metallurgy lime quality be 1500-2500 kilograms, reduction slag charge in：Superfine metallurgy lime
300-400 kilograms, 30-60 kilograms of 100-150 kilograms of fluorite and fine aluminium；Step 3) in quartz sand quality be 200-300 thousand
Gram, the quality of sulphur iron is 450kg-550 kilograms, and the quality of carbonization rice husk is 30-40 kilograms.
The invention discloses a kind of method for controlling molten steel sulfur content, the present invention has preparation technology simple, controls sulfur-bearing
The characteristics of measuring accurate, substantially improves the cutting ability of steel, reduces the extension difference of sulfur-bearing steel different directions.More than
The product that method is produced, preferable effect is obtained in terms of oxygen content detection, field trash grading and the experiment of hairline tower.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementations
Example.
Embodiment 1
Embodiment 1 discloses a kind of method for controlling stainless molten steel sulfur content, it is characterised in that prepare step including following
Suddenly：
1st, the preparation of molten steel：By taking the steel of austenitic stainless steel 303 as an example, electric furnace steel tapping molten steel element mass percent is：Carbon
1.7%, silicon 0.25%, chromium 16.37%, nickel 7.6%, copper 0.30%, surplus is iron；Wherein electric furnace is 30 tons of magnitudes, molten steel
Quality is 29.5 tons.
2nd, AOD smelts：Electric furnace molten steel is blended into AOD furnace, adds 1800kg one-level metallurgy limes, and basicity of slag 1.8 is added high
Chromium, nickel plate alloy, oxygen decarburization are smelted by AOD distributions, and molten steel phosphorus content is taken off to mass ratio 0.02%, ferrosilicon is added also
Original, stirs 5 minutes, samples, skims, and ensures that remaining slag amount is less than 100kg after end of skimming, adds reduction slag charge：Superfine smelting
Metal and stone ash 350kg, fluorite 120kg, fine aluminium 40kg, are stirred 5 minutes.1640 DEG C of tapping temperature, 29.5 tons of molten steel.
3rd, LF smelts：The molten steel that AOD comes out, is hung to LF machining positions, thermometric, sampling.It is powered 20 minutes, temperature is at 1670 DEG C
It is stable to maintain, quartz sand (baking 30 minutes) 250kg is added, it is in alkalescent (basicity 1.6) to make clinker.According still further to the rate of recovery
70% plus sulphur iron (content 26%) 500kg.It is powered 18 minutes, sampling.Sulfur content 0.295%, adds sulphur iron 100kg, is powered
10 minutes, sampling, sulfur content 0.350%, 120 meters of feeding CaSi lines added carbonization rice husk 30kg.Soft blow 10 minutes.Molten steel
1520 DEG C of temperature, hangs out cast.
Wherein product predominantly detects index in embodiment 1
Hairline testing result
Material：303 specifications：∮65
Embodiment 2
Embodiment 2 discloses a kind of method for controlling stainless molten steel sulfur content, it is characterised in that prepare step including following
Suddenly：
1st, the preparation of molten steel：By taking the steel of austenitic stainless steel 303 as an example, electric furnace steel tapping molten steel element mass percent is：Carbon
1.6%, silicon 0.5%, chromium 16.5%, nickel 7.7%, copper 0.35%, surplus is iron；Wherein electric furnace is 30 tons of magnitudes, the matter of molten steel
Measure as 29.5 tons.
2nd, AOD smelts：Electric furnace molten steel is blended into AOD furnace, adds 1500kg one-level metallurgy limes, and basicity of slag 1.6 is added high
Chromium, nickel plate alloy, oxygen decarburization are smelted by AOD distributions, and molten steel phosphorus content is taken off to mass ratio 0.028%, ferrosilicon is added also
Original, stirs 5 minutes, samples, skims, remaining slag amount about 100kg after end of skimming, and adds reduction slag charge：Superfine metallurgy lime
300kg, fluorite 100kg, fine aluminium 30kg, are stirred 5 minutes.1684 DEG C of tapping temperature, 29.1 tons of molten steel.
3rd, LF smelts：The molten steel that AOD comes out, is hung to LF machining positions, thermometric, sampling.It is powered 11 minutes, temperature is at 1680 DEG C
It is stable to maintain, quartz sand (baking 40 minutes) 200kg is added, it is in alkalescent (basicity 1.7) to make clinker.According still further to the rate of recovery
70% plus sulphur iron (content 26%) 450kg.It is powered 20 minutes, sampling.Sulfur content 0.310%, adds sulphur iron 80kg, energization 10
Minute, sampling, sulfur content 0.340%, 120 meters of feeding CaSi lines add carbonization rice husk 30kg.Soft blow 11 minutes.Molten steel temperature
1534 DEG C of degree, hangs out cast.
Wherein product predominantly detects index in embodiment 2
Hairline testing result
Material：303 specifications：∮75
Embodiment 3
Embodiment 3 discloses a kind of method for controlling stainless molten steel sulfur content, it is characterised in that prepare step including following
Suddenly：
1st, the preparation of molten steel：By taking the steel of austenitic stainless steel 303 as an example, electric furnace steel tapping molten steel element mass percent is：Carbon
1.7%, silicon 0.45%, chromium 16.4%, nickel 7.6%, copper 0.28%, surplus is iron；Wherein electric furnace is 30 tons of magnitudes, the matter of molten steel
Measure as 29.5 tons.
2nd, AOD smelts：Electric furnace molten steel is blended into AOD furnace, adds 2500kg one-level metallurgy limes, and basicity of slag 1.7 is added high
Chromium, nickel plate alloy, oxygen decarburization are smelted by AOD distributions, and molten steel phosphorus content is taken off to mass ratio 0.026%, ferrosilicon is added also
Original, stirs 5 minutes, samples, skims, remaining slag amount about 100kg after end of skimming, and adds reduction slag charge：Superfine metallurgy lime
400kg, fluorite 150kg, fine aluminium 60kg, are stirred 5 minutes.1682 DEG C of tapping temperature, 29.8 tons of molten steel.
3rd, LF smelts：The molten steel that AOD comes out, is hung to LF machining positions, thermometric, sampling.It is powered 13 minutes, temperature is at 1675 DEG C
It is stable to maintain, quartz sand (baking 40 minutes) 300kg is added, it is in alkalescent (basicity 1.7) to make clinker.According still further to the rate of recovery
70% plus sulphur iron (content 26%) 550kg.It is powered 20 minutes, sampling.Sulfur content 0.280%, adds sulphur iron 120kg, is powered
15 minutes, sampling, sulfur content 0.345%, 130 meters of feeding CaSi lines added carbonization rice husk 40kg.Soft blow 14 minutes.Molten steel
1530 DEG C of temperature, hangs out cast.
Wherein product predominantly detects index in embodiment 3
Hairline testing result
Material：303 specifications：∮80
Embodiment 4
Embodiment 4 discloses a kind of method for controlling stainless molten steel sulfur content, it is characterised in that prepare step including following
Suddenly：
1st, the preparation of molten steel：By taking the steel of austenitic stainless steel 303 as an example, electric furnace steel tapping molten steel element mass percent is：Carbon
1.6%, silicon 0.42%, chromium 16.5%, nickel 7.5%, copper 0.31%, surplus is iron；
2nd, AOD smelts：Electric furnace molten steel is blended into AOD furnace, adds 1900kg one-level metallurgy limes, and basicity of slag 1.7 is added high
Chromium, nickel plate alloy, oxygen decarburization are smelted by AOD distributions, and molten steel phosphorus content is taken off to mass ratio 0.028%, ferrosilicon is added also
Original, stirs 5 minutes, samples, skims, remaining slag amount about 100kg after end of skimming, and adds reduction slag charge：Superfine metallurgy lime
340kg, fluorite 110kg, fine aluminium 40kg, are stirred 5 minutes.1685 DEG C of tapping temperature, 29.6 tons of molten steel.
3rd, LF smelts：The molten steel that AOD comes out, is hung to LF machining positions, thermometric, sampling.It is powered 10 minutes, temperature is at 1673 DEG C
It is stable to maintain, quartz sand (baking 40 minutes) 250kg is added, it is in alkalescent (basicity 1.7) to make clinker.According still further to the rate of recovery
70% plus sulphur iron (content 26%) 500kg.It is powered 20 minutes, sampling.Sulfur content 0.290%, adds sulphur iron 100kg, is powered
12 minutes, sampling, sulfur content 0.350%, 120 meters of feeding CaSi lines added carbonization rice husk 30kg.Soft blow 12 minutes.Molten steel
1536 DEG C of temperature, hangs out cast.
Wherein product predominantly detects index in embodiment 4
Hairline testing result
Material：303 specifications：∮75
It is with 30 tonnes of electric smelters, to austenitic stainless steel the invention discloses a kind of method for controlling molten steel sulfur content
The control sulphur methods of 303 steel, work is illustrated.Other serial austenitic stainless steels and different tons can also be used for using this method
The electric smelter of level, as long as according to the weight of molten steel, in corresponding ratio materials, can also reach same effect.
Claims (6)
1. a kind of method for controlling stainless molten steel sulfur content, it is characterised in that including following preparation process：
1) preparation of molten steel, stainless steel material is poured into electric furnace and slightly refined, and molten steel is made；
2) AOD furnace is smelted, by step 1) in obtained molten steel be blended into AOD furnace, add one-level metallurgy lime, control basicity of slag
For 1.5-2.0, then added into the AOD furnace after Gao Ge-nickel plate alloy, carry out oxygen decarburization processing；Wherein, blown described
During oxygen carbonization treatment, the phosphorus content in the molten steel is taken off to mass ratio below 0.03%, ferrosilicon is added and is reduced, taken
Sample, skim after, into AOD furnace add reduction slag charge, stirring, by temperature control at 1640-1680 DEG C, tapping；
3) LF stoves smelt, by from step 2) AOD furnace in out molten steel be hung to LF machining positions, thermometric, sampling so that in LF stoves
Temperature maintains 1660-1700 DEG C, adds the quartz sand of drying moisture so that clinker is in alkalescent, the sulfur-bearing in sample
The size of amount is finely adjusted again so that sulfur recovery rate maintains 70%, and the qualified molten steel of sulfur content then is fed into CaSi lines
100-150 meters, add after carbonization rice husk, soft blow 8-10 minutes, liquid steel temperature maintains 1520-1530 DEG C, then hang out and poured
Note.
2. as claimed in claim 1 control stainless molten steel sulfur content method, it is characterised in that step 1) described in it is stainless
Steel is that the element mass percent in the steel of control sulphur austenitic stainless steel 303, the molten steel is：Carbon 1.5-2.0%, silicon 0.2-
0.6%, chromium 16.30-16.8%, nickel 7.5-8.0%, copper≤0.50%, surplus is iron.
3. as claimed in claim 1 control stainless molten steel sulfur content method, it is characterised in that step 2) described in reduce
Slag charge is：The mixture of superfine metallurgy lime, fluorite and fine aluminium.
4. as claimed in claim 1 control stainless molten steel sulfur content method, it is characterised in that step 3) described in weak base
Property be basicity 1.6-1.8.
5. as claimed in claim 3 control stainless molten steel sulfur content method, it is characterised in that step 3) described in sample
In sulfur content size fine setting method be：When sulfur content lacks, sulfur content is added in LF stoves and is carried out for 26% sulphur iron
Increase sulphur；When sulfur content is excessive, increases lime in LF stoves or fine aluminium carries out desulfurization.
6. as claimed in claim 5 control stainless molten steel sulfur content method, it is characterised in that step 1) described in electric furnace
For 30 tonnes, the quality of the molten steel is 29.5 tons；Step 2) described in one-level metallurgy lime quality be 1500-2500 thousand
Gram, in the reduction slag charge：30-60 kilograms of superfine 300-400 kilograms of metallurgy lime, 100-150 kilograms of fluorite and fine aluminium；Step
It is rapid 3) described in the quality of quartz sand be 200-300 kilograms, the quality of the sulphur iron is 450kg-550 kilograms, the carbonization rice
The quality of shell is 30-40 kilograms.
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| CN201710338876.0A CN107164609A (en) | 2017-05-15 | 2017-05-15 | A kind of method for controlling stainless molten steel sulfur content |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669900A (en) * | 2019-10-08 | 2020-01-10 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN110819913A (en) * | 2019-11-27 | 2020-02-21 | 攀钢集团江油长城特殊钢有限公司 | Chalcogenide free-cutting stainless steel and preparation method thereof |
| CN113684345A (en) * | 2021-08-27 | 2021-11-23 | 安徽工业大学 | Preparation method of free-cutting electroslag remelting stainless steel and stainless steel prepared by method |
| CN115044774A (en) * | 2022-06-08 | 2022-09-13 | 山东工业职业学院 | Preparation method of chromium alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768701A (en) * | 2010-01-15 | 2010-07-07 | 山西太钢不锈钢股份有限公司 | Nickel heat-resistance stainless steel and manufacturing method thereof |
| CN105567907A (en) * | 2016-01-06 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for controlling plastic inclusions of austenitic stainless steel |
-
2017
- 2017-05-15 CN CN201710338876.0A patent/CN107164609A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768701A (en) * | 2010-01-15 | 2010-07-07 | 山西太钢不锈钢股份有限公司 | Nickel heat-resistance stainless steel and manufacturing method thereof |
| CN105567907A (en) * | 2016-01-06 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for controlling plastic inclusions of austenitic stainless steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669900A (en) * | 2019-10-08 | 2020-01-10 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN110669900B (en) * | 2019-10-08 | 2021-08-06 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN110819913A (en) * | 2019-11-27 | 2020-02-21 | 攀钢集团江油长城特殊钢有限公司 | Chalcogenide free-cutting stainless steel and preparation method thereof |
| CN113684345A (en) * | 2021-08-27 | 2021-11-23 | 安徽工业大学 | Preparation method of free-cutting electroslag remelting stainless steel and stainless steel prepared by method |
| CN115044774A (en) * | 2022-06-08 | 2022-09-13 | 山东工业职业学院 | Preparation method of chromium alloy |
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Application publication date: 20170915 |