CN105463309B - A kind of production method for eliminating low carbon mild steel cross breaks defect - Google Patents
A kind of production method for eliminating low carbon mild steel cross breaks defect Download PDFInfo
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- CN105463309B CN105463309B CN201510863326.1A CN201510863326A CN105463309B CN 105463309 B CN105463309 B CN 105463309B CN 201510863326 A CN201510863326 A CN 201510863326A CN 105463309 B CN105463309 B CN 105463309B
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Materials Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
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Abstract
The invention belongs to field of iron and steel smelting, and in particular to a kind of production method of elimination low carbon mild steel cross breaks defect.A kind of production method for eliminating low carbon mild steel cross breaks defect of the present invention, the production method is comprised the following steps：Steel billet → hot rolling → section cooling → batch, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.06%~0.10%, Si≤0.05%, Mn≤0.40%, P≤0.025%, S≤0.025%, Ti≤0.03%, remaining is Fe and inevitable impurity.The invention provides a kind of production method for eliminating low carbon mild steel cross breaks defect, by the yield strength for controlling carbon content to properly increase low carbon mild steel, C, N interstitial atom for recycling trace amount of titanium to fix in steel, the purpose of low carbon mild steel cross breaks defect is eliminated to reach so as to eliminate yield point elongation, has the advantages that method is simple, low production cost, product high comprehensive performance.
Description
Technical field
The invention belongs to field of iron and steel smelting, and in particular to a kind of production method of elimination low carbon mild steel cross breaks defect.
Background technology
Cross break refer to hot-rolled sheet coil in uncoiling process, coiled sheet certain position occur perpendicular to roll to strip roll over
Trace, even wide through whole plate when serious, being touched with hand has obvious concave-convex sense.There is cross break and lacks in low-carbon hot-rolled steel after winding off
It is a kind of common phenomenon to fall into.According to industrial production experience have shown that, in the low coil of strip of yield strength (such as SPHC, Q235) easily
There is cross break phenomenon.
Eliminate or mitigate the conventional method of yield phenomenon have control uncoiling mode, it is smooth and eliminate solid solution interstitial atom (carbon,
Nitrogen etc.).For mild steel, eliminating solid solution interstitial atom need to add substantial amounts of alloy, and cost is too high；Control uncoiling mode lacks general
All over property, even fashion needs to increase investment and process cost.
Application No. " 200410022466.8 ", entitled " one kind eliminates hot rolling carbon steel structural steel cross breaks defect
Production method ", disclose it is a kind of by hot rolling, air cooling, water-cooled, batch, in the steel billet C content be 0.13%~
0.19%, the coiling temperature in the hot-rolled step is 580~640 DEG C.The patent is by adjusting the carbon of hot rolling carbon structural steels
Content and hot rolling technology, obtain " quasi- acicular ferrite " tissue, eliminate the cross breaks defect of hot rolling carbon structural steels.The patent pin
To be carbon structural steels, wherein carbon content is higher, and the strength of materials is higher, cross breaks defect produce probability it is smaller, and by control
Make " quasi- acicular ferrite " tissue to solve cross breaks defect, control difficulty is big.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of low production cost, and the elimination low carbon mild steel of process is simple is horizontal
Roll over the production method of defect.
A kind of production method for eliminating low carbon mild steel cross breaks defect of the present invention, the production method is comprised the following steps：Steel billet
→ hot rolling → section cooling → batch, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.06%~
0.10%, Si≤0.05%, Mn≤0.40%, P≤0.025%, S≤0.025%, Ti≤0.03%, remaining is Fe and can not
The impurity for avoiding.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.06%~0.10%, Si 0.01%~
0.03%, Mn0.15%~0.40%, P≤0.015%, S≤0.010%, Ti0.012%~0.025%, remaining is for Fe and not
Evitable impurity.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.10%, Si 0.02%, Mn 0.15%, P
0.012%, S 0.010%, Ti 0.019%, remaining is Fe and inevitable impurity.
A kind of production method for eliminating low carbon mild steel cross breaks defect described above, wherein finish rolling is opened in the hot-rolled step
Temperature is rolled for 950~1050 DEG C, and finishing temperature is 830~900 DEG C in hot-rolled step；Coiling temperature is 600~660 DEG C.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein in the hot-rolled step finish rolling start rolling temperature be 952~1048 DEG C, in hot-rolled step finishing temperature be 834~
897℃；Coiling temperature is 600~660 DEG C.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein the start rolling temperature of finish rolling is 1048 DEG C in the hot-rolled step, finishing temperature is 897 DEG C in hot-rolled step；Batch
Temperature is 660 DEG C.
The invention provides a kind of production method for eliminating low carbon mild steel cross breaks defect, by controlling carbon content suitably to carry
The yield strength of height carbon soft steel, C, N interstitial atom for recycling trace amount of titanium to fix in steel, so as to eliminate yield point elongation to reach
The purpose of low carbon mild steel cross breaks defect is eliminated, has the advantages that method is simple, low production cost, product high comprehensive performance.
Brief description of the drawings
Fig. 1 low carbon mild steel stress strain curve figures of the present invention.
Specific embodiment
A kind of production method for eliminating low carbon mild steel cross breaks defect of the present invention, the production method is comprised the following steps：Steel billet
→ hot rolling → section cooling → batch, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.06%~
0.10%, Si≤0.05%, Mn≤0.40%, P≤0.025%, S≤0.025%, Ti≤0.03%, remaining is Fe and can not
The impurity for avoiding.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.06%~0.10%, Si 0.01%~
0.03%, Mn0.15%~0.40%, P≤0.015%, S≤0.010%, Ti0.012%~0.025%, remaining is for Fe and not
Evitable impurity.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein the steel billet is made up of following percentage by weight chemical composition：C 0.10%, Si 0.02%, Mn 0.15%, P
0.012%, S 0.010%, Ti 0.019%, remaining is Fe and inevitable impurity.
A kind of production method for eliminating low carbon mild steel cross breaks defect described above, wherein finish rolling is opened in the hot-rolled step
Temperature is rolled for 950~1050 DEG C, and finishing temperature is 830~900 DEG C in hot-rolled step；Coiling temperature is 600~660 DEG C.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein in the hot-rolled step finish rolling start rolling temperature be 952~1048 DEG C, in hot-rolled step finishing temperature be 834~
897℃；Coiling temperature is 600~660 DEG C.
Further, as preferred technical scheme, a kind of production for eliminating low carbon mild steel cross breaks defect described above
Method, wherein the start rolling temperature of finish rolling is 1048 DEG C in the hot-rolled step, finishing temperature is 897 DEG C in hot-rolled step；Batch
Temperature is 660 DEG C.
Wherein, finish rolling start rolling temperature is 950~1050 DEG C in the hot-rolled step, and temperature is too low, and rolling rhythm is too slow, raw
Produce efficiency low；Temperature is too high, and operation of rolling cooling velocity is too fast, uneven microstructure, causes finished product combination property poor.
Finishing temperature is 830~900 DEG C in the hot-rolled step, and temperature is too low, and ultra-thin gauge rolling stability is poor, is also easy to produce
Broken belt or surface defect；Temperature is too high, and cooling velocity is too fast, uneven microstructure, and is also easy to produce three iron scales.
The temperature batched in step is 600~660 DEG C, and temperature is too low, is also easy to produce bainite structure, and elongation percentage is low；
Temperature is too high, and finished product coarse grains, dislocation density is small.
Accompanying drawing 1 is low carbon mild steel stress strain curve figure of the present invention, as can be seen from Figure 1：Stress strain curve surrender of the invention
Platform is eliminated completely.
Specific embodiment of the invention is further described with reference to embodiment, is not therefore limited the present invention
System is among described scope of embodiments.
Embodiment 1
The production method of low carbon mild steel cross breaks defect is eliminated, is comprised the following steps：Steel billet → hot rolling → section cooling → volume
Take.
Wherein, the chemical component weight percentage of steel billet is：C：0.06%, Si：0.01%, Mn：0.39%, P：
0.015%, S：0.009%, Ti：0.025%, remaining is Fe and inevitable impurity.
Finish rolling start rolling temperature is 952 DEG C in hot-rolled step, and finishing temperature is 834 DEG C in hot-rolled step；In batching step
Temperature is 600 DEG C.
The low carbon mild steel mechanical property Rel of above method production：239MPa, Rm：333MPa, A%：48%；Lack without cross break
Fall into.
Embodiment 2
The production method of low carbon mild steel cross breaks defect is eliminated, is comprised the following steps：Steel billet → hot rolling → section cooling → volume
Take.
Wherein, the chemical component weight percentage of steel billet is：C：0.08%, Si：0.03%, Mn：0.20%, P：
0.013%, S：0.008%, Ti：0.012%, remaining is Fe and inevitable impurity.
Finish rolling start rolling temperature is 1005 DEG C in hot-rolled step, and finishing temperature is 872 DEG C in hot-rolled step；In batching step
Temperature is 630 DEG C.
The low carbon mild steel mechanical property Rel of above method production：252MPa, Rm：360MPa, A%：46%；Lack without cross break
Fall into.
Embodiment 3
The production method of low carbon mild steel cross breaks defect is eliminated, is comprised the following steps：Steel billet → hot rolling → section cooling → volume
Take.
Wherein, the chemical component weight percentage of steel billet is：C：0.10%, Si：0.02%, Mn：0.15%, P：
0.012%, S：0.010%, Ti：0.019%, remaining is Fe and inevitable impurity.
Finish rolling start rolling temperature is 1048 DEG C in hot-rolled step, and finishing temperature is 897 DEG C in hot-rolled step；In batching step
Temperature is 660 DEG C.
The low carbon mild steel mechanical property Rel of above method production：267MPa, Rm：354MPa, A%：45%；Lack without cross break
Fall into.
Claims (1)
1. a kind of production method for eliminating low carbon mild steel cross breaks defect, the production method comprises the following steps：Steel billet → hot rolling →
Section cooling → batch, it is characterised in that：The steel billet is made up of following percentage by weight chemical composition：C 0.10%, Si
0.02%, Mn 0.15%, P 0.012%, S 0.010%, Ti 0.019%, remaining is Fe and inevitable impurity；
The start rolling temperature of finish rolling is 1048 DEG C in the hot-rolled step, and finishing temperature is 897 DEG C in hot-rolled step；Coiling temperature is
660℃；
The low carbon mild steel mechanical property Rel of above method production：267MPa, Rm：354MPa, A%：45%；Without cross breaks defect.
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| CN201510863326.1A CN105463309B (en) | 2015-12-01 | 2015-12-01 | A kind of production method for eliminating low carbon mild steel cross breaks defect |
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| CN201510863326.1A CN105463309B (en) | 2015-12-01 | 2015-12-01 | A kind of production method for eliminating low carbon mild steel cross breaks defect |
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| CN105463309A CN105463309A (en) | 2016-04-06 |
| CN105463309B true CN105463309B (en) | 2017-07-07 |
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| CN114645195B (en) * | 2020-10-31 | 2023-01-31 | 日照宝华新材料有限公司 | Hot-rolled pickled sheet band without transverse crease defect |
| CN114160576B (en) * | 2021-11-15 | 2023-09-15 | 山东钢铁集团日照有限公司 | Control method for transverse fold lines of low-carbon steel hot rolled commodity coil for structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757783A (en) * | 2005-11-04 | 2006-04-12 | 东北大学 | Manufacturing method of 700MPa grade F/B high strength band steel |
| CN101096740A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Carbon steel double-roller thin-belt continuous metal cast process |
| CN103540845A (en) * | 2013-11-07 | 2014-01-29 | 武汉钢铁(集团)公司 | Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof |
| CN104694824A (en) * | 2015-03-26 | 2015-06-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-cost automobile girder hot rolled steel plate and production method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3806958B2 (en) * | 1995-11-10 | 2006-08-09 | Ｊｆｅスチール株式会社 | Manufacturing method of high-tensile hot-rolled steel sheet |
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- 2015-12-01 CN CN201510863326.1A patent/CN105463309B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757783A (en) * | 2005-11-04 | 2006-04-12 | 东北大学 | Manufacturing method of 700MPa grade F/B high strength band steel |
| CN101096740A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Carbon steel double-roller thin-belt continuous metal cast process |
| CN103540845A (en) * | 2013-11-07 | 2014-01-29 | 武汉钢铁(集团)公司 | Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof |
| CN104694824A (en) * | 2015-03-26 | 2015-06-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-cost automobile girder hot rolled steel plate and production method |
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