CN107419191A - Ultra-thin weathering steel and its production method - Google Patents
Ultra-thin weathering steel and its production method Download PDFInfo
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- CN107419191A CN107419191A CN201710701198.XA CN201710701198A CN107419191A CN 107419191 A CN107419191 A CN 107419191A CN 201710701198 A CN201710701198 A CN 201710701198A CN 107419191 A CN107419191 A CN 107419191A
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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
- C22C38/18—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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of Ultra-thin weathering steel and its production method, belongs to Ferrous Metallurgy and hot-rolling plate band production technical field.Present invention solves the technical problem that it is to provide a kind of Thin Specs weathering steel of the excellent performance produced based on conventional hot continuous rolling machine unit, using traditional hot-rolled production process.The weathering steel chemical component weight percentage is：C≤0.12%, Si：0.25~0.45%, Mn：0.20~0.45%, P：0.060~0.090%, S≤0.015%, Cr：0.30~0.40%, Ni：0.15~0.20%, Cu：0.25~0.30%, surplus is Fe and inevitable impurity.Production method comprises the following steps：→ packaging and storage is batched in desulfurizing iron → converter smelting → LF refining → sheet billet continuous casting → hot rolling → section cooling →.Weathering steel of the present invention has that production cost is low, and technique is simple without separately building the production of special producing line, and product qualification rate is high, the features such as weathering steel excellent combination property.
Description
Technical field
The invention belongs to Ferrous Metallurgy and hot-rolling plate band production technical field, and in particular to a kind of Ultra-thin weathering steel
And its production method.
Background technology
Weathering steel, also known as weather resisting steel, the fields such as building, vehicle, container, bridge are now widely used in, are one
Class has the low-alloy steel of good corrosion resistance in an atmosphere, and its C content is less than 0.2wt.%, Cu, Cr, Ni, P, Si, Mn etc.
3-5wt.% is less than as main alloy element and total content.By substantial amounts of research both at home and abroad, generally believe now through long
Temporally be exposed in air, weather-proof steel surface will generate one layer of densification and the good oxidation product of tack make steel matrix with it is outer
Boundary's corrosive substance isolation, so as to significantly improve the decay resistance of weathering steel.
Chinese patent application 201610766086.8 discloses a kind of weather-proof based on the production of ESP bar strip continuous casting and rolling flow paths
The method of steel, the alloying component and weight percent content of the weathering steel are：C：0.01~0.06%, Si：0.30~0.60%,
Mn：0.30~0.60%, P：0.05~0.12%, S≤0.01%, Cu：0.25~0.45%, Cr：0.30~0.80%, Ni≤
0.30%, surplus is Fe and inevitable impurity.The production of Thin Specs weathering steel is based on ESP production lines, adopted in the patent
With strip endless casting rolling technique, it is not suitable for based on conventional hot continuous rolling machine unit, using the thin of traditional hot-rolled production process
Specification weathering steel produces.
Chinese patent application 201410591781.6 discloses weathering steel hot rolled thin strip and its manufacturer of a kind of no P segregations
Method, its chemical composition of the weathering steel hot rolled thin strip include by mass percentage：C：0.07~0.12%, Si：0.30~0.60%,
Mn：0.40~0.55%, P：0.06~0.15%, S≤0.02%, Cu：0.20~0.50%, Cr：0.60~0.80%, Ni：
0.03~0.11%, Al≤0.046%, B≤0.003%, surplus are Fe and inevitable impurity.Thin Specs are resistance in the patent
Wait steel to be produced based on sheet billet continuous casting and rolling production line, be not also suitable for based on conventional hot continuous rolling machine unit, using control
Roll the Thin Specs weathering steel production for controlling cold technique.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of Thin Specs weathering steel of excellent performance and its based on routines
Hot tandem, the production method using traditional hot-rolled production process.
Technical scheme there is provided a kind of Ultra-thin weathering steel, the pole used by the present invention solves above-mentioned technical problem
The chemical component weight percentage of Thin Specs weathering steel is：C≤0.12%, Si：0.25~0.45%, Mn：0.20~0.45%,
P：0.060~0.090%, S≤0.015%, Cr：0.30~0.40%, Ni：0.15~0.20%, Cu：0.25~0.30%,
Surplus is Fe and inevitable impurity.
Preferably, the chemical component weight percentage of above-mentioned Ultra-thin weathering steel is：C：0.06~0.09%, Si：
0.25~0.35%, Mn：0.20~0.30%, P：0.060~0.090%, S≤0.015%, Cr：0.30~0.40%, Ni：
0.15~0.20%, Cu：0.25~0.30%, surplus is Fe and inevitable impurity.
Wherein, the thickness of above-mentioned Ultra-thin weathering steel is 1.5~2.0mm.
Wherein, above-mentioned Ultra-thin weathering steel, its yield strength >=345MPa, tensile strength >=480MPa, elongation percentage >=
24%, 180 ° of cold bending test D=a, relatively corrosive rate (with respect to Q345B)≤60%.
Present invention also offers the production method of above-mentioned Ultra-thin weathering steel, this method comprises the following steps：Molten iron takes off
→ packaging and storage is batched in sulphur → converter smelting → LF refining → sheet billet continuous casting → hot rolling → section cooling →.
Wherein, in the production method of above-mentioned Ultra-thin weathering steel, 1190~1300 DEG C of tapping temperature, roughing centre base thickness
Degree is controlled by 38 ± 1mm, and finishing temperature is 840~900 DEG C, and coiling temperature is 620~680 DEG C.
Preferably, in the production method of above-mentioned Ultra-thin weathering steel, 1260~1300 DEG C of tapping temperature, roughing centre base
Thickness is controlled by 38 ± 1mm, and finishing stands F2~F4 is using 0.28% oil mixing with water than improving rolling lubricant effect, finish to gauge temperature
Spend for 860~900 DEG C, coiling temperature is 640~680 DEG C.
Wherein, in the production method of above-mentioned Ultra-thin weathering steel, the section cooling be using the leading portion type of cooling, on
Collector opens 25%, and lower collector pipe opens 50%.
Beneficial effects of the present invention：
Compared with prior art, the present invention can be based on conventional hot continuous rolling machine unit, using cooling controlling and rolling controlling process Rolling Production 1.5~
Ultra-thin weathering steel thick 2.0mm, without separately building special producing line, significantly reduces production cost；Improve weather-proof tempering
Study point and content, by controlled rolling technological parameter, produce the Ultra-thin weathering steel of high comprehensive performance, reduce simultaneously
Machine utilization.
Embodiment
A kind of Ultra-thin weathering steel provided by the present invention, its chemical component weight percentage are：C≤0.12%, Si：
0.25~0.45%, Mn：0.20~0.45%, P：0.060~0.090%, S≤0.015%, Cr：0.30~0.40%, Ni：
0.15~0.20%, Cu：0.25~0.30%, surplus is Fe and inevitable impurity.
Preferably, a kind of Ultra-thin weathering steel, its chemical component weight percentage are：C：0.06~0.09%, Si：
0.25~0.35%, Mn：0.20~0.30%, P：0.060~0.090%, S≤0.015%, Cr：0.30~0.40%, Ni：
0.15~0.20%, Cu：0.25~0.30%, surplus is Fe and inevitable impurity.
Due to ultra-thin gauge rolling process and cooling procedure deflection is big, cooling rate is fast, organizes more tiny, Strength surplus amount
Greatly, and rolling load is added, therefore reduces alloy content and be advantageous to the stability of rolling and reduce cost, therefore C content is put down
Reducing by 0.02%, Si contents and averagely reducing by 0.10%, Mn contents averagely reduces by 0.15%.
C is effective intensified element in steel, can dissolve in and play a part of solution strengthening in matrix, and can be formed tiny
Carbide Precipitation particle, play a part of precipitation strength, improve carbon content, it is favourable to improving intensity, but too high carbon contains
Amount can form more thick brittle carbide particle in steel, and unfavorable to plasticity and toughness, carbon content is too high can also be in steel plate
Central segregation band, carbon content unfavorable to bending property mouldability while too high increase welding carbon equivalent, is unfavorable for welding and adds
Work, therefore present invention design C≤0.12%, preferably C：0.06~0.09%.
Si has higher solid solubility in steel, is advantageous to refine rusty scale tissue, reduces the overall corrosion rate of steel, improves
Toughness, but too high levels can cause welding performance to decline, and the optimum range of present invention design Si contents is 0.35~0.45%, excellent
The optimum range for selecting Si contents is 0.25~0.35%.
Mn has stronger solution strengthening effect, can significantly reduce the phase transition temperature of steel, refines the microscopic structure of steel, is weight
The Strengthening and Toughening element wanted, but Mn contents excessively increase quenching degree, so as to cause solderability and welding heat influence area toughness to deteriorate,
The optimum range of present invention design Mn contents is 0.35~0.45%, and preferably the optimum range of Mn contents is 0.20~0.30%.
P can effectively improve the atmospheric corrosion resistance of steel, when P combines with Cu to be added in steel, can show preferably multiple
Close effect, but the too high toughness and plasticity that can reduce steel of P content.The optimum range of P content of the present invention is 0.060~0.090%.
S can form sulphide inculsion, easily form pitting propagation in corrosion process, corrosive nature is adversely affected, therefore
Present invention design S≤0.015%.
Cr has remarkable result to the passivation ability for improving steel, and steel surface can be promoted to carry out fine and close passivating film or protectiveness
Rusty scale, its enrichment in rusty scale can effectively improve rusty scale and characteristic, present invention design Cr passed through to the selectivity of Korrosionsmedium
The optimum range of content is 0.30~0.40%.
Ni can significantly improve the low-temperature flexibility of steel, while can effectively prevent that Cu's is hot-short, but Ni is precious metal element,
And too high Ni can increase the adhesiveness of oxide skin, hot rolling defect can be formed on surface by being pressed into steel.Ni contents of the present invention are most
Good scope is 0.15~0.20%,.
Cu, which is added, is advantageous to non-crystal oxide (hydrocarbyl oxide) guarantor that densification is formed on the surface of steel, that adhesiveness is good
Sheath, it is that corrosive medium is difficult to pass through, corrodes so as to preventing the interface zone between steel surface and amorphous state protective layer
Occur, the time is longer, and protective layer is finer and close, and anti-corrosion effect is more obvious.In addition, Cu can also offset the illeffects of S in steel, Cu
The sulfide of indissoluble is generated with S, so as to offset S to the corrosion proof illeffects of steel.The optimum range of Cu contents of the present invention is
0.25~0.30%.
The thickness of above-mentioned Ultra-thin weathering steel is 1.5~2.0mm.
Above-mentioned Ultra-thin weathering steel, its yield strength >=345MPa, tensile strength >=480MPa, elongation percentage >=24%,
180 ° of cold bending test D=a (D is Bend diameter, and a is sample thickness), relatively corrosive rate (with respect to Q345B)≤60%.
The production method of above-mentioned Ultra-thin weathering steel, comprises the following steps：Desulfurizing iron → converter smelting → LF refining
→ packaging and storage is batched in → sheet billet continuous casting → hot rolling → section cooling →.
Wherein, in hot-rolled process, Ultra-thin is come out of the stove using high temperature, to reduce rolling load and keep the operation of rolling stable
Property.F2~F4 (i.e. the frame of mm finishing mill unit the 2nd~the 4th) uses lubrication and rolling, and lubrication and rolling oil mixing with water ratio is 0.28%.Due to
Thin slab product draught pressure is big, and steel edge portion position roll wear is severe, increases the production difficulty of product, it is therefore desirable to carry
High rolling lubricant effect, to reduce steel edge portion position roll wear, reach the mesh for reducing draught pressure and improving strip shape quality
's.Finish to gauge and coiling temperature are properly increased, rolling load can be effectively reduced in the case where being influenceed less on end properties.
Preferably, 1190~1300 DEG C of tapping temperature, roughing workpiece thickness are controlled by 38 ± 1mm, finishing temperature 840
~900 DEG C, coiling temperature is 620~680 DEG C.
It is furthermore preferred that 1260~1300 DEG C of tapping temperature, roughing workpiece thickness is controlled by 38 ± 1mm, finishing stands F2
~F4 is 860~900 DEG C than improving rolling lubricant effect, finishing temperature using 0.28% oil mixing with water, coiling temperature 640
~680 DEG C.
Lower collector pipe water can not be too low on section cooling in cooling procedure, otherwise can not ensure coiling temperature, also can not mistake
Height, the too fast tissue for causing bainite etc. to be not intended to obtain of cooling rate can otherwise occurred, influences end properties.
Section cooling process, using the leading portion type of cooling, upper header opens 25%, and lower collector pipe opens 50%, is cooled down by controlling
Technique ensures that Ultra-thin weathering steel obtains tiny, uniform " polygonal ferrite+a small amount of pearlite " tissue.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
Embodiment 1
The preparation of Ultra-thin weathering steel：Desulfurizing iron → converter smelting → LF refining → sheet billet continuous casting → hot rolling → laminar flow
Cool down → batch → packaging and storage.Wherein, finishing stands F2~F4 is imitated using 0.28% oil mixing with water than improving rolling lubrication
Fruit；Section cooling process, using the leading portion type of cooling, upper header opens 25%, and lower collector pipe opens 50%.Specific hot rolling and coiling temperature
Control situation is as shown in table 1.
The hot rolling of 1 embodiment of table 1 and oiler temperature control situation
Gained weathering steel chemical component weight percentage：C：0.08%, Si：0.28%, Mn：0.24%, P：0.070%,
S：0.007%, Cr：0.34%, Ni：0.15%, Cu：0.26%, surplus is Fe and inevitable impurity.Its combination property is such as
Shown in table 2.
The weathering steel combination property of 2 embodiment of table 1
Embodiment 2
The preparation of titaniferous think gauge weathering steel：Desulfurizing iron → converter smelting → LF refining → sheet billet continuous casting → hot rolling → layer
Stream cools down → batched → packaging and storage.Wherein, finishing stands F2~F4 improves rolling lubrication using 0.28% oil mixing with water ratio
Effect；Section cooling process, using the leading portion type of cooling, upper header opens 25%, and lower collector pipe opens 50%.Specific hot rolling and batch temperature
It is as shown in table 3 to spend control situation.
The hot rolling of 3 embodiment of table 2 and oiler temperature control situation
Gained weathering steel chemical component weight percentage：C：0.08%, Si：0.28%, Mn：0.26%, P：0.070%,
S：0.005%, Cr：0.33%, Ni：0.15%, Cu：0.26%, surplus is Fe and inevitable impurity.Its combination property is such as
Shown in table 4.
The weathering steel combination property of 4 embodiment of table 2
From embodiment 1,2, the present invention can by conventional hot continuous rolling machine unit, using cooling controlling and rolling controlling process, using routine
Production line, the Ultra-thin weathering steel of high comprehensive performance thick 1.5~2.0mm of production, production cost is low, and machine utilization is small.
Claims (8)
1. Ultra-thin weathering steel, it is characterised in that：Its chemical component weight percentage is：C≤0.12%, Si：0.25~
0.45%, Mn：0.20~0.45%, P：0.060~0.090%, S≤0.015%, Cr：0.30~0.40%, Ni：0.15~
0.20%, Cu：0.25~0.30%, surplus is Fe and inevitable impurity.
2. Ultra-thin weathering steel according to claim 1, it is characterised in that：Its chemical component weight percentage is：C：
0.06~0.09%, Si：0.25~0.35%, Mn：0.20~0.30%, P：0.060~0.090%, S≤0.015%, Cr：
0.30~0.40%, Ni：0.15~0.20%, Cu：0.25~0.30%, surplus is Fe and inevitable impurity.
3. Ultra-thin weathering steel according to claim 1 or 2, it is characterised in that：The thickness of the Ultra-thin weathering steel
Spend for 1.5~2.0mm.
4. according to the Ultra-thin weathering steel described in claim 1,2 or 3 any one, it is characterised in that：The Ultra-thin is resistance to
Hou Gang, its yield strength >=345MPa, tensile strength >=480MPa, elongation percentage >=24%, 180 ° cold bending test D=a are relatively rotten
Erosion rate≤60%.
5. the production method of the Ultra-thin weathering steel described in any one of Claims 1 to 4, it is characterised in that：Including following step
Suddenly：→ packaging and storage is batched in desulfurizing iron → converter smelting → LF refining → sheet billet continuous casting → hot rolling → section cooling →.
6. the production method of Ultra-thin weathering steel according to claim 5, it is characterised in that：Tapping temperature 1190~
1300 DEG C, roughing workpiece thickness is controlled by 38 ± 1mm, and finishing temperature is 840~900 DEG C, and coiling temperature is 620~680 DEG C.
7. the production method of Ultra-thin weathering steel according to claim 6, it is characterised in that：Tapping temperature 1260~
1300 DEG C, roughing workpiece thickness is controlled by 38 ± 1mm, and finishing stands F2~F4 is rolled using 0.28% oil mixing with water than raising
Lubricant effect processed, finishing temperature are 860~900 DEG C, and coiling temperature is 640~680 DEG C.
8. the production method of the Ultra-thin weathering steel according to any one of claim 5~7, it is characterised in that：The layer
Stream is cooled to use the leading portion type of cooling, and upper header opens 25%, and lower collector pipe opens 50%.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108971225A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of weather-proof checkered steel plate and its production method |
| CN109234617A (en) * | 2018-09-12 | 2019-01-18 | 河钢股份有限公司承德分公司 | A kind of no nickel hot rolling thin gauge weathering steel volume and its production method |
| CN110592486A (en) * | 2019-10-21 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Niobium-containing 550 MPa-grade thick weathering resistant steel and production method thereof |
| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
| CN111850406A (en) * | 2020-07-29 | 2020-10-30 | 攀钢集团研究院有限公司 | 380MPa grade high-phosphorus weathering steel and preparation method thereof |
| CN112522592A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | High-strength thin-specification fire-resistant weather-resistant steel plate/belt and production method thereof |
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| CN115161547A (en) * | 2022-04-27 | 2022-10-11 | 日照钢铁控股集团有限公司 | Manufacturing method of atmospheric corrosion resistant checkered plate |
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| CN109234617A (en) * | 2018-09-12 | 2019-01-18 | 河钢股份有限公司承德分公司 | A kind of no nickel hot rolling thin gauge weathering steel volume and its production method |
| CN108971225B (en) * | 2018-09-27 | 2020-10-30 | 武汉钢铁有限公司 | Production method of weather-resistant patterned steel plate |
| CN108971225A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of weather-proof checkered steel plate and its production method |
| CN112522592A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | High-strength thin-specification fire-resistant weather-resistant steel plate/belt and production method thereof |
| CN110592486A (en) * | 2019-10-21 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Niobium-containing 550 MPa-grade thick weathering resistant steel and production method thereof |
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Application publication date: 20171201 |