CN107475608A - Manufacturing method for improving surface quality of low-carbon boron-added steel wire rod - Google Patents
Manufacturing method for improving surface quality of low-carbon boron-added steel wire rod Download PDFInfo
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- CN107475608A CN107475608A CN201710633044.1A CN201710633044A CN107475608A CN 107475608 A CN107475608 A CN 107475608A CN 201710633044 A CN201710633044 A CN 201710633044A CN 107475608 A CN107475608 A CN 107475608A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 title abstract description 26
- 239000010959 steel Substances 0.000 title abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000009749 continuous casting Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 4
- 229910000712 Boron steel Inorganic materials 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 8
- 239000000443 aerosol Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052796 boron Inorganic materials 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The application discloses a manufacturing method for improving the surface quality of a low-carbon boron-added steel wire rod, which comprises continuous casting and hot rolling, wherein the control conditions in the continuous casting process are as follows: the degree of superheat is controlled to be 25-40 ℃, the continuous casting pulling speed is 2.6-2.85 m/min, the cooling water quantity of the crystallizer is 1680-1720L/min, the vibration frequency of the crystallizer is 160-200 Hz, and the amplitude is 6.5-8.0 mm. According to the invention, the surface temperature of the continuous casting billet is subjected to preliminary step cooling by optimizing and adjusting the process parameters of the continuous casting crystallizer and the secondary cooling process parameters, so that the thermal stress in the continuous casting process is reduced, and meanwhile, a high-temperature brittle region caused by adding boron element in low-carbon boron-added steel is avoided, so that the formation of surface crack defects of the low-carbon boron-added steel continuous casting billet can be effectively prevented, and the control of the surface quality of a subsequent low-carbon boron-added steel wire rod finished product is facilitated; the influence of BN on high-temperature plasticity of the low-carbon boron-added steel blank in the heating and rolling processes is reduced or eliminated, and the influence of improper rolling temperature control on the surface quality of a finished wire rod product of the low-carbon boron-added steel is reduced or eliminated.
Description
Technical field
The application is related to technical field of ferrous metallurgy, adds boron steel wire rod surface quality more particularly to a kind of raising low-carbon
Manufacture method.
Background technology
Boron-containing steel refers to the steel using boron as main alloy element, and boron element can be carried significantly due to indivisible (5~30ppm)
Gao Gang quenching degree, the combination property of steel can be improved while production cost is reduced.But B addition is also great
The steel grade crack sensitivity is improved, therefore, the method by adding Al or Ti elements in the steel, reduces B element to low-carbon
The influence of boron-containing steel surface quality, both approaches are all different according to thermodynamic condition, are easier to and [N] element by adding
With reference to member BN formation is usually reduced or avoided, assemble so as to reduce BN in crystal boundary.But the AlN formed is added after Al elements,
Equally readily along crystal boundary segregation, can also large effect be caused to the high temperature plastic of steel, simply its Precipitation Temperature section
It is different from BN, therefore casting process surface temperature control scope is different；And after adding Ti elements, TiN can be in crystalline substance in process of setting
Boundary and transgranular precipitation, less in crystal boundary aggregation, its influence to high-temp plastic is less, but the chemism of Ti elements is larger,
Easily TiO is combined to form with O, N elementxNozzle clogging is caused with TiN, so as to influence casting process castability energy, to crystallizer
Liquid level will also result in larger influence of fluctuations, so as to influence surface quality of continuously cast slab.Therefore, by adding Al or Ti members in steel
The method of element, can not very well improve and solve low-carbon and add boron steel surface quality problems, while also increase production cost.
The content of the invention
It is an object of the invention to provide a kind of manufacture method for improving low-carbon and adding boron steel wire rod surface quality, by even
The control and optimization of process parameter and rolling process heating furnace and start rolling temperature are cast, boron element is reduced or eliminated so as to realize
The purpose of influence to low-carbon plus boron steel surface quality, improve the product qualified rate of wire rod.
To achieve the above object, the present invention provides following technical scheme：
The embodiment of the present application discloses a kind of manufacture method for improving low-carbon and adding boron steel wire rod surface quality, and low-carbon adds boron steel disk
The chemical composition of bar includes by percentage to the quality：0.05%≤C≤0.30%, 8ppm≤B≤30ppm, 0.08%≤Si≤
0.20%th, Mn≤0.80%, 0≤Al≤0.005%, remaining is Fe and inevitable impurity element；Its manufacture method includes
Continuous casting and hot rolling, control condition in casting process：The degree of superheat control be 25 DEG C~40 DEG C, pulling speed of continuous casting be 2.6m/min~
2.85m/min, crystallizer cooling water inflow are 1680L/min~1720L/min, and mold oscillation frequency is 160Hz~200Hz,
Amplitude is 6.5mm~8.0mm.
Preferably, in above-mentioned raising low-carbon adds the manufacture method of boron steel wire rod surface quality, in casting process, control
Condition：The specific water of secondary cooling is 0.75L/kg~1.00L/kg.
Preferably, in above-mentioned raising low-carbon adds the manufacture method of boron steel wire rod surface quality, secondary cooling is divided into four
But pattern, the area of secondary cooling 3 and 4th area use aerosol refrigerating mode using full water cooling for area, the wherein area of secondary cooling 1 and 2nd area.
Further, according to the different Stepped control principles gradually reduced using intensity of cooling of each area's cooling length, carry out
Two cold subregion water operations.
Preferably, in above-mentioned raising low-carbon adds the manufacture method of boron steel wire rod surface quality, described secondary cooling
In, subregion cooling water inflow accounts for the cold partition length L of total Water ratio R and two and meets following relation：
1st area, 105≤R1/L1≤128；
2nd area, 16≤R2/L2≤25；
3rd area, 4.5≤R3/L3≤8.0；
4th area, 2.5≤R4/L4≤5.0。
Preferably, in above-mentioned raising low-carbon adds the manufacture method of boron steel wire rod surface quality, in the hot rolling technology,
Control condition：Heating furnace soaking zone temperature control is 1050 DEG C~1150 DEG C, and the control of blank start rolling temperature is 950 DEG C~1050
℃。
Compared with prior art, the advantage of the invention is that：
1. the present invention realizes continuous casting billet table by being optimized and revised to continuous cast mold technological parameter and two cold technological parameters
The preliminary staged cooling of face temperature, reduces casting process thermal stress, while avoids low-carbon and add in boron steel because boron element addition is made
Into high-temperature brittleness region, can effectively prevent low-carbon from adding the formation of boron steel continuous casting billet face crack defect, be advantageous to follow-up low
Carbon adds the control of boron steel wire rod finished surface quality；
2. subtracted in the present invention by adding the influences of BN to high-temp plastic during heating and open rolling of boron steel blank to low-carbon
Less or eliminate low-carbon add boron steel because rolling temperature control the improper influence to wire rod finished surface quality.
3. the present invention adds the combined influence of boron steel wire rod surface quality by the innovation of technique to avoid BN to low-carbon, relatively
In by increase Al, Ti etc. member usually consolidate N method, there is the characteristics of simple economy, will not also bring nozzle clogging etc. other
Quality problems.
Embodiment
The present invention is described further by the following example：According to following embodiments, the present invention may be better understood.
However, as it will be easily appreciated by one skilled in the art that specific material ratio, process conditions and its result described by embodiment are only used
In the explanation present invention, without should be also without limitation on the present invention described in detail in claims.
The steel grade of various embodiments of the present invention does not add Ti elements, and Al content is micro or is free of.Steel wire rod surface quality master
To include wire rod face crack, scab, pit, the defects of folding, these defect incidences are lower, show that wire rod surface quality is got over
It is good.
Embodiment 1
The present embodiment steel grade is SAE1006B, by smelting molten steel, controls the chemical composition mass percent to be：
0.05%≤C≤0.10%, 12ppm≤B≤20ppm, 0.08%≤Si≤0.20%, Mn≤0.80%, Al≤0.005%,
Remaining is Fe and inevitable impurity element.
The steel grade produces on billet caster, Cross Section of CC Billet 140mm*140mm, in casting process, by the degree of superheat
Control is in the range of 25~35 DEG C, and pulling speed of continuous casting is stable in 2.7 ± 0.05m/min, and crystallizer cooling water inflow is 1700 ± 20L/
Min, mold oscillation FREQUENCY CONTROL are 180Hz, amplitude controlling 7.0mm.
Continuous casting two cold specific water control is 0.90L/kg, wherein two cold 1st area and 2nd area use full water cooling but pattern, two cold 3rd area
Aerosol refrigerating mode is used with 4th area, and two cold subregion cooling water inflows account for total Water ratio R (unit %) and grown with two cold subregions
Spending L, (unit m) meets following relation：Two cold 1st area, R1/L1=115；Two cold 2nd area, R2/L2=24；Two cold 3rd area, R3/L3=
4.5；Two cold 4th area, R4/L4=2.5.
It is 1060 DEG C ± 10 DEG C by heating furnace soaking zone temperature control in rolling process control, blank start rolling temperature control
It is made as 970 DEG C ± 10 DEG C.
The low-carbon of the present embodiment production adds boron steel surface quality of continuously cast slab preferable, and oscillation mark mean depth is 0.28mm, blank
Surface acid-washing is not found the defects of crackle, and it is only 0.35% that wire rod finished product, which averagely returns useless rate, after rolling.
Embodiment 2
The present embodiment steel grade is SAE1015B, by smelting molten steel, controls the chemical composition mass percent to be：
0.12%≤C≤0.18%, 12ppm≤B≤18ppm, 0.10%≤Si≤0.16%, Mn≤0.80%, Al≤0.005%,
Remaining is Fe and inevitable impurity element.
The steel grade produces on billet caster, Cross Section of CC Billet 140mm*140mm, in casting process, by the degree of superheat
Control is in the range of 25~40 DEG C, and pulling speed of continuous casting is stable in 2.75 ± 0.05m/min, and crystallizer cooling water inflow is 1700 ± 20L/
Min, mold oscillation FREQUENCY CONTROL are 200Hz, amplitude controlling 6.5mm.
Continuous casting two cold specific water control is 0.98L/kg, wherein two cold 1st area and 2nd area use full water cooling but pattern, two cold 3rd area
Aerosol refrigerating mode is used with 4th area, and two cold subregion cooling water inflows account for total Water ratio R (unit %) and two cold partition lengths
(unit m) meets following relation to L：Two cold 1st area, R1/L1=108；Two cold 2nd area, R2/L2=23；Two cold 3rd area, R3/L3=
5.2；Two cold 4th area, R4/L4=3.0.
It is 1100 DEG C ± 10 DEG C by heating furnace soaking zone temperature control in rolling process control, blank start rolling temperature control
It is made as 990 DEG C ± 10 DEG C.
The low-carbon of the present embodiment production adds boron steel surface quality of continuously cast slab preferable, and oscillation mark mean depth is 0.25mm, blank
Surface acid-washing is not found the defects of crackle, and it is only 0.27% that wire rod finished product, which averagely returns useless rate, after rolling.
Comparative example 1
The steel grade of this comparative example is SAE1015B, by smelting molten steel, controls chemical composition mass percent
For：0.12%≤C≤0.18%, 12ppm≤B≤18ppm, 0.10%≤Si≤0.16%, Mn≤0.80%, Al≤
0.005%, remaining is Fe and inevitable impurity element；
The steel grade produces on billet caster, Cross Section of CC Billet 140mm*140mm, and its casting process parameter is as follows：
The degree of superheat is controlled in the range of 25~35 DEG C, and pulling speed of continuous casting is stable in 2.65 ± 0.05m/min, and crystallizer cooling water inflow is 1800
± 20L/min, mold oscillation FREQUENCY CONTROL are 180Hz, amplitude controlling 7.8mm.
Continuous casting two cold specific water control is 1.22L/kg, wherein two cold 1st area and 2nd area use full water cooling but pattern, two cold 3rd area
Aerosol refrigerating mode is used with 4th area, and two cold subregion cooling water inflows account for total Water ratio R (unit %) and two cold partition lengths
(unit m) meets following relation to L：Two cold 1st area, R1/L1=98；Two cold 2nd area, R2/L2=27；Two cold 3rd area, R3/L3=
6.6；Two cold 4th area, R4/L4=4.2.
It is 1100 DEG C ± 10 DEG C by heating furnace soaking zone temperature control in rolling process control, blank start rolling temperature control
It is made as 900 ± 30 DEG C.
The low-carbon of the present embodiment production adds boron steel surface quality of continuously cast slab poor, and oscillation mark mean depth is 0.38mm, blank
There is more net claw-like crack defect in adjacent corner, blank sample surfaces cracking frequency is up to 20.5%, after rolling wire rod into
Product averagely return useless rate as 3.99%.
Finally, it is to be noted that, term " comprising ", "comprising" or its any other variant be intended to it is non-exclusive
Property includes, so that process, method, article or equipment including a series of elements not only include those key elements, and
Also include the other element that is not expressly set out, or also include for this process, method, article or equipment inherently
Key element.
Claims (5)
1. a kind of manufacture method for improving low-carbon and adding boron steel wire rod surface quality, it is characterised in that low-carbon adds the change of boron steel wire rod
Study point includes by percentage to the quality：0.05%≤C≤0.30%, 8ppm≤B≤30ppm, 0.08%≤Si≤0.20%,
Mn≤0.80%, 0≤Al≤0.005%, remaining is Fe and inevitable impurity element；Its manufacture method includes continuous casting and heat
Roll, control condition in casting process：Degree of superheat control is 25 DEG C~40 DEG C, and pulling speed of continuous casting is 2.6m/min~2.85m/min, knot
Brilliant device cooling water inflow is 1680L/min~1720L/min, and mold oscillation frequency is 160Hz~200Hz, amplitude be 6.5mm~
8.0mm。
2. the manufacture method according to claim 1 for improving low-carbon and adding boron steel wire rod surface quality, it is characterised in that：Continuous casting
During, control condition：The specific water of secondary cooling is 0.75L/kg~1.00L/kg.
3. the manufacture method according to claim 2 for improving low-carbon and adding boron steel wire rod surface quality, it is characterised in that：It is secondary
Cooling is divided into 4th area, and wherein but pattern, the area of secondary cooling 3 and 4th area are cold using aerosol using full water cooling for the area of secondary cooling 1 and 2nd area
But pattern.
4. the manufacture method according to claim 3 for improving low-carbon and adding boron steel wire rod surface quality, it is characterised in that：It is described
Secondary cooling in, subregion cooling water inflow accounts for the cold partition length L of total Water ratio R and two and meets following relation：
1st area, 105≤R1/L1≤128；
2nd area, 16≤R2/L2≤25；
3rd area, 4.5≤R3/L3≤8.0；
4th area, 2.5≤R4/L4≤5.0。
5. the manufacture method according to claim 1 for improving low-carbon and adding boron steel wire rod surface quality, it is characterised in that：It is described
In hot rolling technology, control condition：Heating furnace soaking zone temperature control is 1050 DEG C~1150 DEG C, and the control of blank start rolling temperature is
950 DEG C~1050 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710633044.1A CN107475608A (en) | 2017-07-28 | 2017-07-28 | Manufacturing method for improving surface quality of low-carbon boron-added steel wire rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710633044.1A CN107475608A (en) | 2017-07-28 | 2017-07-28 | Manufacturing method for improving surface quality of low-carbon boron-added steel wire rod |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118387A (en) * | 2019-12-13 | 2020-05-08 | 河钢乐亭钢铁有限公司 | Method for improving surface quality of boron-containing steel continuous casting slab |
| CN111347020A (en) * | 2018-12-24 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Method for controlling internal quality of 82B steel type continuous casting billet in steelmaking continuous casting process |
| CN111992686A (en) * | 2020-09-03 | 2020-11-27 | 福建三钢闽光股份有限公司 | Aerial fog full-water combined cooling high-carbon steel continuous casting production method |
| CN115679222A (en) * | 2022-11-01 | 2023-02-03 | 包头钢铁（集团）有限责任公司 | Production method of cold heading steel wire rod for making nails |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347020A (en) * | 2018-12-24 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Method for controlling internal quality of 82B steel type continuous casting billet in steelmaking continuous casting process |
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| CN115679222A (en) * | 2022-11-01 | 2023-02-03 | 包头钢铁（集团）有限责任公司 | Production method of cold heading steel wire rod for making nails |
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Application publication date: 20171215 |