CN108823506A - A kind of tensile strength >=1000MPa cored steel and production method - Google Patents
A kind of tensile strength >=1000MPa cored steel and production method Download PDFInfo
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- CN108823506A CN108823506A CN201810645214.2A CN201810645214A CN108823506A CN 108823506 A CN108823506 A CN 108823506A CN 201810645214 A CN201810645214 A CN 201810645214A CN 108823506 A CN108823506 A CN 108823506A
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
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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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Abstract
A kind of tensile strength >=1000MPa cored steel, component and wt% are：C：0.05-0.15%, Si：No more than 0.01%, Mn：0.03-0.20%, P≤0.020%, S≤0.010%, Als：0.02-0.06%, Cu+Ni+Cr+Mo≤0.050%；Production method：Converter smelting is carried out according to clean steel；Tapping；Top of the slag deoxidation is carried out into argon station；Determine oxygen twice in succession for the first time；RH application of vacuum；It is casting continuously to form base；Slab is heated under reducing atmosphere；High pressure descaling；Roughing；Finish rolling；Subtract sizing；Spinning；It is cooling.The present invention not only tensile strength >=1000MPa, and conductivity also has good cold drawing performance 14% or more.
Description
Technical field
The present invention relates to a kind of high-altitude erection high tensile steel wire and production method, definitely belong to tensile strength >=
1000MPa cored steel and production method.
Background technique
Tensile strength >=1000MPa cored steel is mainly used for field wide span coaxial cable, tramcar sliding transmission of electricity
The production of cable.It is to the requirement of tensile strength >=1000MPa cored steel：Its tensile strength is tempered after cold working to be reached
1000Mpa or more, and its conductivity is also required 14% or more, drawing property will also be got well simultaneously.These requirements not only produce
Difficulty is big, and between each other there is also influencing each other, for example, between conductivity and intensity be exactly in this way, i.e. when intensity is high,
Conductivity then can be relatively low, and when conductivity is high, intensity again can be relatively low, cannot meet the requirements simultaneously, this just brings to production very big
It is difficult.
About tensile strength >=1000MPa cored steel, there is presently no retrieve pertinent literature content.Market survey, mesh
Before, tensile strength >=1000MPa cored steel producer uses Q235 wire rod as raw material.But due to carbon in Q235 wire rod,
Silicon, manganese content are higher, although intensity can satisfy, cause to be also easy to produce hardening in drawing process, and conductivity is low, only 12%.
Therefore market demands are not able to satisfy.
The chemical component of Q235, C：0.1-0.20%, Si：0.03-0.1%, Mn：0.20-0.55%, P≤0.025%, S≤
0.015%,
Q235 wire rod tensile property, tensile strength 400-500MPa, elongation percentage is in 30-40（%）, reduction of area is in 70-75（%）.
Tensile strength >=1000MPa cored steel is replaced with Q235, major defect is very low in the conductivity of the steel, and only 12%,
Drawing property is poor.Therefore user wishes to find new steel grade.It is required to meet user, has carried out tensile strength >=1000MPa
The exploitation of cored steel.
Summary of the invention
The invention reside in the shortcomings of the prior art is overcome, a kind of not only tensile strength >=1000MPa is provided, and conductive
Rate also has good cold drawing performance, and cored steel and production method without carrying out pickling 14% or more.
Realize the measure of above-mentioned purpose：
A kind of tensile strength >=1000MPa cored steel, component and weight percent content are：C：0.05-0.15%, Si：Do not surpass
Cross 0.01%, Mn：0.03-0.20%, P≤0.020%, S≤0.010%, Als：0.02-0.06%, Cu+Ni+Cr+Mo≤0.050%,
Remaining is Fe and inevitable impurity.
Preferably：The weight percent content of Si is ≤0.0085%.
Preferably：The weight percent content of Als is in 0.02-0.05%.
Preferably：Weight percent content≤0.032% of Cu+Ni+Cr+Mo.
A kind of method for producing tensile strength >=1000MPa cored steel, step：
1）Converter smelting is carried out according to clean steel：And it controls into S≤0.001% in the molten iron of converter；When making steel terminal, C≤
0.06%, O content is 0.040~0.070%；
2）Tapping：Slag thickness is controlled when tapping and is no more than 50mm, and finishing slag basicity is 3.0 ~ 4.0；
3）Ladle enters argon station and carries out top of the slag deoxidation：If iron oxide is no more than 5% in slag, without carrying out top of the slag deoxidation；When in slag
When iron oxide is more than 5%, aluminum shots are added according to 0.1 ~ 0.5kg/ tons of steel into slag when tapping, is down to when the iron oxide in slag and does not surpass
When 5%, 0.5 ~ 3min of soft blow argon is carried out；
4）It carries out determining oxygen twice in succession for the first time, and controls the difference for determining oxygen twice no more than 50PPm；
5）RH application of vacuum is carried out, is carried out in the case where vacuum degree is no more than 100Pa：
A, decarburization is first carried out, and controls the Ar flow during decarburization in 700 ± 10L/min；O content after decarburization in molten steel is not
More than 400PPm, decarburization is terminated after carbon content is less than or equal to setting value；
B, it carries out determining oxygen twice in succession for the second time, and controls the difference for determining oxygen twice no more than 50PPm；
C, final deoxidizing and deep desulfurization are carried out, aluminum shot is added according to the oxygen content in steel and carries out final deoxidizing, circulation time is not less than
5min；Lime and fluorite is added according to conventional setting value and carries out Argon circulation, circulation time is not less than 5min；
D, manganese addition iron and carbon dust in steel manganese and carbon be finely adjusted, 4 ~ 6min is recycled after fine tuning；
E, it carries out third time and determines oxygen twice in succession：It is carried out in 2~3 minutes before fine tuning circulation terminates, and is controlled in steel certainly
By oxygen in 15ppm or less；
6）It is casting continuously to form base, and controls drawing speed in 0.5 ~ 10.m/min；
7）Slab is heated under reducing atmosphere, and controls the soaking temperature of slab at 1100 ~ 1200 DEG C, the section temperature difference is no more than
30 DEG C, time inside furnace is in 120 ~ 180min；
8）High pressure descaling is carried out in the state of high pressure water maximum；
9）Roughing is carried out, controls its start rolling temperature at 1020 ~ 1080 DEG C；
10）Finish rolling is carried out, controls its start rolling temperature at 885 ~ 915 DEG C；
11）It carries out subtracting sizing, controls the temperature of reducing sizing mill entrance at 880 ~ 900 DEG C；
12）It spins, controls its laying temperature at 850 ~ 870 DEG C；
13）Carry out conventional stelmor cooling.
It is：In tapping, if the difference of carbon content is positive value when the carbon content setting value of steel and steel-making terminal, tap
When aluminum shot pre-deoxidations are added according to 0.1 ~ 0.5kg/ tons of steel into slag；If carbon content when the carbon content setting value of steel and steel-making terminal
Difference be negative value, without plus aluminum shot pre-deoxidation.
It is：In RH application of vacuum, decarburization time is no more than 8min.
It is：When for the first time or when determining oxygen twice in succession not in control range for the second time, then deoxidation should be continued,
Until meet the requirements carries out subsequent processing again.
The effect and mechanism of each element and main technique in the present invention
C：For carbon, carbon is main intensified element in steel, and every increase by 0.01% in steel, then hardness of steel increases 8-9MPa, substantially
For linear relationship.And its content determines the setting rate that wire rod is further cold worked, if lower than range, final products intensity is limited
It does not reach requirement；Range is limited if being higher than, processing setting rate can cause drawing that can not go on quickly.
Mn：Manganese is set primarily directed to Mn/S >=10, is prevented hot-short.Modern mass production steel-smelting technology generally can only
Sulphur is taken off 0.003%-0.01%, manganese not only prevents hot-short effect, manganese or pearlite formation element in steel.If lower than limit
Determine range, not having prevents hot-short effect, and processing setting rate is slower；If be higher than limit range, processing setting rate can quickly,
Cause drawing that can not go on.
Si：Harmful element for element silicon, if be higher than limit range, processing setting rate can quickly, cause drawing without
Method goes on.
P:Phosphorus is harmful element, more lower better, limits range if being higher than, and will lead to cold short quickening when steel cold working, causes
Drawing fracture of wire is frequent.
S:Sulphur is harmful element, more lower better, limits range if being higher than, will lead to hot-short when rolling, lead to drawing fracture of wire
Frequently.
Als:How much is the content of Als in steel, depends primarily on drawing property, as tensile strength >=1000MPa cored
Steel, it is desirable that its drawing property is very good, no matter comes from the drawing property that steel-making, slab do not occur rimhole and improve steel
It says, the Als in steel should be >=0.02%.If not having prevents the heating crystal grain effect of growing up lower than range is limited, deteriorate steel
Drawing property；Range is limited if being higher than, steel conductivity can be made to reduce very much.
Cu+Ni+Cr+Mo：Cu+Ni+Cr+Mo≤0.05% is required for residual elements Cu, Ni, Cr, Mo in steel, for state
Interior steel mill Cu, Ni, Cr, Mo are mainly residual elements in molten iron, according to our test, Cu+Ni+Cr+Mo≤0.06% pair steel
Conductivity influence is simultaneously little；Range is limited if being higher than, distortion of lattice can be very big in steel, deteriorates drawing property.
Compared with prior art, the present invention not only tensile strength >=1000MPa, and conductivity also has good 14% or more
Good cold drawing performance.
Specific embodiment
The present invention is described in detail below：
Table 1 is the chemical component list of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is the capabilities list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention follow the steps below production：
1）Converter smelting is carried out according to clean steel：And it controls into S≤0.001% in the molten iron of converter；When making steel terminal, C≤
0.06%, O content is 0.040~0.070%；
2）Tapping：Slag thickness is controlled when tapping and is no more than 50mm, and finishing slag basicity is 3.0 ~ 4.0；
3）Ladle enters argon station and carries out top of the slag deoxidation：If iron oxide is no more than 5% in slag, without carrying out top of the slag deoxidation；When in slag
When iron oxide is more than 5%, aluminum shots are added according to 0.1 ~ 0.5kg/ tons of steel into slag when tapping, is down to when the iron oxide in slag and does not surpass
When 5%, 0.5 ~ 3min of soft blow argon is carried out；
4）It carries out determining oxygen twice in succession for the first time, and controls the difference for determining oxygen twice no more than 50PPm；
5）RH application of vacuum is carried out, is carried out in the case where vacuum degree is no more than 100Pa：
A, decarburization is first carried out, and controls the Ar flow during decarburization in 700 ± 10L/min；O content after decarburization in molten steel is not
More than 400PPm, decarburization is terminated after carbon content is less than or equal to setting value；
B, it carries out determining oxygen twice in succession for the second time, and controls the difference for determining oxygen twice no more than 50PPm；
C, final deoxidizing and deep desulfurization are carried out, aluminum shot is added according to the oxygen content in steel and carries out final deoxidizing, circulation time is not less than
5min；Lime and fluorite is added according to conventional setting value and carries out Argon circulation, circulation time is not less than 5min；
D, manganese addition iron and carbon dust in steel manganese and carbon be finely adjusted, 4 ~ 6min is recycled after fine tuning；
E, it carries out third time and determines oxygen twice in succession：It is carried out in 2~3 minutes before fine tuning circulation terminates, and is controlled in steel certainly
By oxygen in 15ppm or less；
6）It is casting continuously to form base, and controls drawing speed in 0.5 ~ 10.m/min；
7）Slab is heated under reducing atmosphere, and controls the soaking temperature of slab at 1100 ~ 1200 DEG C, the section temperature difference is no more than
30 DEG C, time inside furnace is in 120 ~ 180min；
8）High pressure descaling is carried out in the state of high pressure water maximum；
9）Roughing is carried out, controls its start rolling temperature at 1020 ~ 1080 DEG C；
10）Finish rolling is carried out, controls its start rolling temperature at 885 ~ 915 DEG C；
11）It carries out subtracting sizing, controls the temperature of reducing sizing mill entrance at 880 ~ 900 DEG C；
12）It spins, controls its laying temperature at 850 ~ 870 DEG C；
13）Carry out conventional stelmor cooling.
The chemical component of 1 various embodiments of the present invention of table and comparative example（wt.%）
The main technologic parameters comparative example of 2 various embodiments of the present invention of table and comparative example
The main technologic parameters comparative example of 2 various embodiments of the present invention of continued and comparative example（One）
The capabilities list of 3 various embodiments of the present invention of table and comparative example
From table 3 it can be seen that the wire rod diameter of institute's embodiment is in 9-12mm, corresponding excellent in mechanical performance, conductivity is high, tension
Intensity, elongation percentage and reduction of area are all satisfied requirement, wherein tensile strength is distributed in 350-410（MPa）, elongation percentage is in 30-55（%）,
Reduction of area is in 70-80（%）, conductivity is in 14.1-15, hence it is evident that is higher than comparative example（Q195 and Q235）, product tensile strength after tempering
For 1050-1200MPa, minimum drawing diameter in 0.5mm, is better than the 0.9mm of comparative example.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (8)
1. a kind of tensile strength >=1000MPa cored steel, component and weight percent content are：C：0.05-0.15%, Si：No
More than 0.01%, Mn：0.03-0.20%, P≤0.020%, S≤0.010%, Als：0.02-0.06%, Cu+Ni+Cr+Mo≤
0.050%, remaining is Fe and inevitable impurity.
2. a kind of tensile strength >=1000MPa cored steel as described in claim 1, it is characterised in that：The weight percent of Si
Content is ≤0.0085%.
3. a kind of tensile strength >=1000MPa cored steel as described in claim 1, it is characterised in that：The weight percent of Als
Content is in 0.02-0.05%.
4. a kind of tensile strength >=1000MPa cored steel as described in claim 1, it is characterised in that：The weight of Cu+Ni+Cr+Mo
Measure degree≤0.032%.
5. producing a kind of method of tensile strength >=1000MPa cored steel as described in claim 1, step：
1）Converter smelting is carried out according to clean steel：And it controls into S≤0.001% in the molten iron of converter；When making steel terminal, C≤
0.06%, O content is 0.040~0.070%；
2）Tapping：Slag thickness is controlled when tapping and is no more than 50mm, and finishing slag basicity is 3.0 ~ 4.0；
3）Ladle enters argon station and carries out top of the slag deoxidation：If iron oxide is no more than 5% in slag, without carrying out top of the slag deoxidation；When in slag
When iron oxide is more than 5%, aluminum shots are added according to 0.1 ~ 0.5kg/ tons of steel into slag when tapping, is down to when the iron oxide in slag and does not surpass
When 5%, 0.5 ~ 3min of soft blow argon is carried out；
4）It carries out determining oxygen twice in succession for the first time, and controls the difference for determining oxygen twice no more than 50PPm；
5）RH application of vacuum is carried out, is carried out in the case where vacuum degree is no more than 100Pa：
A, decarburization is first carried out, and controls the Ar flow during decarburization in 700 ± 10L/min；O content after decarburization in molten steel is not
More than 400PPm, decarburization is terminated after carbon content is less than or equal to setting value；
B, it carries out determining oxygen twice in succession for the second time, and controls the difference for determining oxygen twice no more than 50PPm；
C, final deoxidizing and deep desulfurization are carried out, aluminum shot is added according to the oxygen content in steel and carries out final deoxidizing, circulation time is not less than
5min；Lime and fluorite is added according to conventional setting value and carries out Argon circulation, circulation time is not less than 5min；
D, manganese addition iron and carbon dust in steel manganese and carbon be finely adjusted, 4 ~ 6min is recycled after fine tuning；
E, it carries out third time and determines oxygen twice in succession：It is carried out in 2~3 minutes before fine tuning circulation terminates, and is controlled in steel certainly
By oxygen in 15ppm or less；
6）It is casting continuously to form base, and controls drawing speed in 0.5 ~ 10.m/min；
7）Slab is heated under reducing atmosphere, and controls the soaking temperature of slab at 1100 ~ 1200 DEG C, the section temperature difference is no more than
30 DEG C, time inside furnace is in 120 ~ 180min；
8）High pressure descaling is carried out in the state of high pressure water maximum；
9）Roughing is carried out, controls its start rolling temperature at 1020 ~ 1080 DEG C；
10）Finish rolling is carried out, controls its start rolling temperature at 885 ~ 915 DEG C；
11）It carries out subtracting sizing, controls the temperature of reducing sizing mill entrance at 880 ~ 900 DEG C；
12）It spins, controls its laying temperature at 850 ~ 870 DEG C；
13）Carry out conventional stelmor cooling.
6. producing a kind of method of tensile strength >=1000MPa cored steel as claimed in claim 5, it is characterised in that：Going out
When steel, if the difference of carbon content is positive value when the carbon content setting value of steel and steel-making terminal, when tapping into slag according to 0.1 ~
Aluminum shot pre-deoxidation is added in 0.5kg/ tons of steel；If the difference of carbon content is negative value when the carbon content setting value and steel-making terminal of steel, it is not necessarily to
Add aluminum shot pre-deoxidation.
7. producing a kind of method of tensile strength >=1000MPa cored steel as claimed in claim 5, it is characterised in that：In RH
In vacuum processing, decarburization time is no more than 8min.
8. producing a kind of method of tensile strength >=1000MPa cored steel as claimed in claim 5, it is characterised in that：When
It when once or for the second time determining oxygen twice in succession not in control range, then should continue deoxidation, be carried out again until meeting the requirements
Subsequent processing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112210720A (en) * | 2020-09-29 | 2021-01-12 | 武汉钢铁有限公司 | Hot-rolled wire rod for high-speed rail protection line and production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294147A (en) * | 2014-10-30 | 2015-01-21 | 武汉钢铁(集团)公司 | Super high strength cable steel and production method thereof |
| CN107326281A (en) * | 2017-07-12 | 2017-11-07 | 武汉钢铁有限公司 | High welding performance Socket for electrical appliance steel and its production method |
| CN107675068A (en) * | 2017-09-27 | 2018-02-09 | 武汉钢铁有限公司 | The production method of superfine welding wire steel wire rod |
-
2018
- 2018-06-21 CN CN201810645214.2A patent/CN108823506A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294147A (en) * | 2014-10-30 | 2015-01-21 | 武汉钢铁(集团)公司 | Super high strength cable steel and production method thereof |
| CN107326281A (en) * | 2017-07-12 | 2017-11-07 | 武汉钢铁有限公司 | High welding performance Socket for electrical appliance steel and its production method |
| CN107675068A (en) * | 2017-09-27 | 2018-02-09 | 武汉钢铁有限公司 | The production method of superfine welding wire steel wire rod |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112210720A (en) * | 2020-09-29 | 2021-01-12 | 武汉钢铁有限公司 | Hot-rolled wire rod for high-speed rail protection line and production method |
| CN112210720B (en) * | 2020-09-29 | 2021-12-14 | 武汉钢铁有限公司 | Hot-rolled wire rod for high-speed rail protection line and production method |
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Application publication date: 20181116 |