CN104313491A - Weathering steel hot-rolled thin belt without P segregation and manufacturing method thereof - Google Patents
Weathering steel hot-rolled thin belt without P segregation and manufacturing method thereof Download PDFInfo
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- CN104313491A CN104313491A CN201410591781.6A CN201410591781A CN104313491A CN 104313491 A CN104313491 A CN 104313491A CN 201410591781 A CN201410591781 A CN 201410591781A CN 104313491 A CN104313491 A CN 104313491A
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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
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- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
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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
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
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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
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Abstract
The invention discloses a weathering steel hot-rolled thin belt without P segregation and a manufacturing method thereof. The weathering steel hot-rolled thin belt comprises the following chemical components in percentage by mass: C: 0.07-0.12%; Si: 0.30-0.50%; Mn: 0.4-0.55%; P: 0.06-0.15%; S: not more than 0.02 % and more than 0; Cr: 0.6-0.8%; Ni: 0.03-0.11%; Cu: 0.2-0.5%; Al: not more than 0.046% and more than 0; B: not more than 0.003% and more than 0, and the balance of iron and impurity elements. The weathering steel hot-rolled thin belt disclosed by the invention is low in cost and free from central P segregation and flaky MnS inclusions.
Description
Technical field
The application belongs to steel alloy and manufactures field, particularly relates to a kind of weathering steel hot rolled thin strip without P segregation and manufacture method thereof.
Background technology
Weathering steel can be divided into P content to be less than the welded construction weathering steel of 0.04wt% at the high-weatherability steel of 0.04 ~ 0.15wt% and P content.Environment for use due to freight container is outdoor and oceanic climate etc., be exposed to for a long time in corrosive gases, therefore freight container weathering steel mainly adopts the high-weatherability weathering steel of high P.
When adopting traditional slab CC machine continuous rolling process to produce high P weathering steel, often there is P segregation line at steel plate thickness of slab center, affect the container plate processability in follow-up use procedure.The center segregation of P is mainly due in traditional slab CC machine process, early solidification die wall Quench, define the Quench that is made up of fine isometric crystal grains brilliant, the flowing that the liquid phase of solute does not also form long-range is just solidified, thus the distribution of the P massfraction of early solidification comparatively balances.Proceed along with solidifying, produce column crystal thick in a large number, the liquid phase of solute is had ready conditions and is carried out the flowing of long-range, and the phase after solidification, namely the centre P massfraction of ingot casting sharply raises, and just defines serious center segregation.Traditional slab CC machine characteristic makes the existence of P segregation line inevitable.This segregation line is retained in follow-up Hot Strip Rolling, and final hot-rolled sheet center also exists wider P segregation line.In container plate cold roll forming, easily cause cold bend cracking, affect the service efficiency of container plate.
The patent No. is that the patent of CN101671797B proposes to adopt thin-belt casting rolling technique and the high phosphorus weathering steel producing a kind of surperficial negative segregation phosphorus in conjunction with cold rolled annealed operation, and its Production Flow Chart is longer, and cost is higher.
The weathering steel strip of the patent No. involved by the patent of CN201210067075.2 and CN201210066978.9, with the addition of the alloying constituents such as Vb, V, Ti, Mo, cost is higher.
The patent No. is the production method of the thin-belt casting rolling weathering steel that the patent of CN200910048141.X proposes, and the draught of its hot rolled thin strip is greater than 30%, the more difficult control of template.
In addition, in traditional thick sheet billet continuous casting, easily occur that a large amount of larger-size MnS is mingled with, after the large pressure distortion of hot rolling, form sheet to be mingled with and to be retained in steel plate, this by the transverse toughness of steel and anisotropy energy unfavorable, in the steel plate cutting use procedure in later stage, easily form Laminated steel.Because the S content in steel exists all the time, it is inevitable that this makes MnS be mixed in casting process, and only in steel-making and course of hot rolling, control MnS form effectively could improve the use properties of steel plate.
Summary of the invention
The object of the present invention is to provide a kind of weathering steel hot rolled thin strip without P segregation and manufacture method thereof, to overcome deficiency of the prior art.
For achieving the above object, the invention provides following technical scheme:
The embodiment of the present application discloses a kind of weathering steel hot rolled thin strip without P segregation, and its chemical composition comprises by mass percentage:
C：0.07～0.12％；
Si：0.30～0.50％；
Mn：0.4～0.55％；
P：0.06～0.15％；
S :≤0.02% and be greater than 0;
Cr：0.6～0.8％；
Ni：0.03～0.11％；
Cu：0.2～0.5％；
Al :≤0.046% and be greater than 0;
B :≤0.003% and be greater than 0,
Surplus is iron and impurity element.
Accordingly, the embodiment of the present application also discloses a kind of manufacture method of the weathering steel hot rolled thin strip without P segregation, comprises step:
1), according to chemical composition according to claim 1 and ratio batching, smelt and obtain molten steel;
2), by step 1) molten steel that obtains carries out thin strap continuous casting, obtains Cast Strip;
3), to step 2) in Cast Strip carry out hot rolling, finally cool.
Preferably, in the manufacture method of the above-mentioned weathering steel hot rolled thin strip without P segregation, described step 1) in, adopt molten iron pre-desulfurization, converter top bottom blowing, RH vacuum cycle deoxidization technique, carries out Calcium treatment simultaneously, LF refining, obtains the qualified molten steel of composition.
Preferably; in the manufacture method of the above-mentioned weathering steel hot rolled thin strip without P segregation; described step 2) in; double roll strip casting rolling plant is adopted by molten steel to carry out casting; it is 1500 ~ 1600 DEG C that the opening of molten steel waters temperature; roll casting speed is 30 ~ 100m/min, and molten steel carries out thin strap continuous casting under protection of inert gas.
Preferably, in the manufacture method of the above-mentioned weathering steel hot rolled thin strip without P segregation, the thickness of described Cast Strip is 1.2 ~ 3.0mm.
Preferably, in the manufacture method of the above-mentioned weathering steel hot rolled thin strip without P segregation, described step 3) in, a time hot rolling that described Cast Strip is 5% ~ 20% through draught becomes strip, and hot-rolled temperature is 850 ~ 1050 DEG C.
Preferably, in the manufacture method of the above-mentioned weathering steel hot rolled thin strip without P segregation, the thickness of described strip is 1.0 ~ 2.6mm.
Preferably, in the manufacture method of the above-mentioned weathering steel hot rolled thin strip without P segregation, the strip after described hot rolling is cooled to 500 ~ 600 DEG C with the speed of 5 ~ 50 DEG C/s, obtains hot rolled coil after batching, and then air cooling is to room temperature.
Compared with prior art, the invention has the advantages that:
1, weathering steel cost of the present invention is low.When Composition Design, reduce the Ni element that cost of alloy is higher; In weathering steel preparation process, adopt the short-flow production method of thin-belt casting rolling, production process is few, and production cost and manpower composition significantly reduce.
2, weathering steel processability of the present invention is high.Weathering steel hot rolled thin strip in process of production, due to Cast Strip thinner thickness and setting rate is very fast, in Thin Strip Steel, be mingled with band without the MnS of obvious center P segregation line and strip, show higher toughness and processability, avoid occurring cracking in the Cold Bending of follow-up use.
3, weathering steel strip of the present invention, adopts high P composition, has excellent corrosion resistance nature.Meanwhile, weathering steel strip is made to have higher mechanical property by adding the alloying elements such as Cr, B, its yield strength >=390MPa, tensile strength >=490MPa, elongation after fracture >=21%.
4, adopt the hot rolling of a time light reduction, effectively improve surface quality and the template of hot rolled thin strip.A time hot rolling draught of weathering steel of the present invention is 5% ~ 20%, and Cast Strip relative elongation is in the hot rolling less, and hot rolled strip can be avoided to occur serious shape wave, and relative heavy reduction hot rolling effectively can improve the template of band steel.In addition, the hot rolling of a time light reduction effectively can improve strip surface quality, eliminates strip surface defect, makes Surfaces of Hot Rolled Strip smooth.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Figure 1 shows that the metallograph of the weathering steel obtained in the embodiment of the present invention 1;
Figure 2 shows that the metallograph of the weathering steel obtained in comparative example;
Figure 3 shows that the clod wash photo of the weathering steel obtained in comparative example;
Figure 4 shows that and infiltrate after test through 72 hours periods, the comparison diagram of weathering steel and comparative example weathering steel and Q235B general carbon weathering steel performance in the embodiment of the present invention 1.
Embodiment
The embodiment of the invention discloses a kind of weathering steel hot rolled thin strip without P segregation, its chemical composition comprises by mass percentage: C:0.07 ~ 0.12%; Si:0.30 ~ 0.50%; Mn:0.4 ~ 0.55%; P:0.06 ~ 0.15%; S :≤0.02% and be greater than 0; Cr:0.6 ~ 0.8%; Ni:0.03 ~ 0.11%; Cu:0.2 ~ 0.5%; Al :≤0.046% and be greater than 0; B :≤0.003% and be greater than 0, surplus is iron and impurity element.
C: carbon is the most most economical alloying element improving steel grade intensity, for ensureing the working strength of weathering steel of the present invention, the optimum range of carbon content is: 0.07 ~ 0.12%.
Si: add appropriate silicon and there is resistance to chloride corrosion, resistance to spot corrosion, resistance to dense hot nitric acid in the steel containing certain alloy, anti-oxidant, the performances such as seawater corrosion resistance.When silicone content reaches a certain amount of, element silicon can impel steel surface to form Silicon-rich protective membrane, thus makes steel grade have good solidity to corrosion.In addition, when silicon and copper, chromium with the use of time, the resistance to sea atmosphere corrosion ability of steel can be improved.Silicon also can accelerate the setting rate of steel, is conducive to a certain extent reducing phosphorous segregation.The optimum range of silicone content of the present invention is: 0.30 ~ 0.50%.
Mn: manganese is good highly malleablized element and austenite stabilizer element.The manganese element adding certain content in steel can make steel grade have higher intensity and excellent low-temperature flexibility.The optimum range of Fe content of the present invention is: 0.4 ~ 0.55%.
P: be improve one of the most effective alloying element of atmospheric corrosion resistance.When P and Cu combine add in steel time, demonstrate better complex effect.Under atomospheric corrosion condition; P in steel is anode depolarizer; it can accelerate the uniform dissolution of steel and the rate of oxidation of iron in steel; contribute to steel surface and form uniform FeOOH rusty scale; promote to generate the fine and close protective membrane of non-crystalline state alkali formula ferric oxide Fex (OH) 3-2x; become the protective barrier that slowing down corrosion medium enters steel matrix, make steel exempt from atomospheric corrosion.When P is formed
also play corrosion inhibition, research recently shows
formation can stop Cl
-to the infiltration of rusty scale, in oceanic climate, be conducive to the formation of protective rust.The optimum range of phosphorus content of the present invention is: 0.06 ~ 0.15%.
S: high sulphur content can increase substantially the weathering resistance of steel, but the too high meeting of sulphur content makes steel grade MnS be mingled with quantity and size increases sharply.The optimum range of sulphur content of the present invention is :≤0.02%.
Cr: chromium element can impel steel surface to form fine and close oxide film, improves the passivation ability of steel.When Cr and Cu adds in steel simultaneously, effect is particularly evident.The raising of Cr content is beneficial to refinement alpha-feooh, when Cr content is more than 5% in the alpha-feooh of rusty scale/metal interface, can effectively suppress corrodibility negatively charged ion, particularly Cl
-the intrusion of ion.The optimum range of chromium content of the present invention is: 0.6 ~ 0.8%.
Ni: nickel element can improve the hardening capacity of steel, intensity and low-temperature flexibility.In addition, nickel effectively can also improve the weather resistance of steel, especially sea water corrosion resistant.The optimum range of nickel content of the present invention is: 0.03 ~ 0.11%.
Cu: add Cu element in steel, can make steel grade no matter in rural atmosphere, industrial atmosphere or marine atmosphere, have the corrosion resistance nature superior compared with plain carbon stool.And in serious pollution environment, effect is more obvious.Cathode contacts between the Cu that steel and surface second are separated out, can impel steel anode passivation, and forms the good rusty scale of protectiveness; Various harmful impurity element is there is in weathering steel matrix, interior rusty scale inevitably causes the defects such as a lot of tiny cracks, cavity in formation, the anticorrosion effect of rusty scale in reducing, at this moment Cu element fault location enrichment in rusty scale, the compactness of rusty scale in improving, blocking external agency leads to the road of matrix, the overall solidity to corrosion of rusty scale in improving.Cu hinders the growth of rusty scale in addition, promotes that in rusty scale, alpha-feooh is formed, and reduces the grain-size of FeOOH and the size of deposit seeds, plays refining effect to rusty scale.The optimum range of copper content of the present invention is: 0.2 ~ 0.5%.
Al: aluminium is the main deoxidant element of steel grade, but aluminium too high levels will cause oxide inclusion to increase, reduces the purity of steel, is unfavorable for the toughness of steel grade.The optimum range of aluminium content of the present invention is :≤0.046%.
B: the B element adding trace in steel can improve the hot rolling performance of steel, and can improve the intensity of steel.The optimum range of Boron contents of the present invention is :≤0.003%.
Accordingly, the embodiment of the present application also discloses a kind of manufacture method of the weathering steel hot rolled thin strip without P segregation, comprises step:
1), according to chemical composition according to claim 1 and ratio batching, smelt and obtain molten steel;
2), by step 1) molten steel that obtains carries out thin strap continuous casting, obtains Cast Strip;
3), to step 2) in Cast Strip carry out hot rolling, finally cool.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.The example of these preferred implementations illustrates in the accompanying drawings.Shown in accompanying drawing and the embodiments of the present invention described with reference to the accompanying drawings be only exemplary, and the present invention is not limited to these embodiments.
At this, also it should be noted that, in order to avoid the present invention fuzzy because of unnecessary details, illustrate only in the accompanying drawings with according to the closely-related structure of the solution of the present invention and/or treatment step, and eliminate other details little with relation of the present invention.
Embodiment 1
(1) smelt: adopt molten iron pre-desulfurization, converter top bottom blowing, RH vacuum cycle deoxidization technique, carry out Calcium treatment simultaneously, LF refining, obtain the qualified molten steel of composition, be by weight percentage: C:0.08%, Si:0.30%, Mn:0.48%, P:0.08%, S:0.005%, Cr:0.60%, Ni:0.04%, Cu:0.27%, Al:0.03%, B:0.003%, surplus are iron and impurity element.
(2) thin strap continuous casting: adopt double roll strip casting rolling plant to carry out casting on molten steel qualified for composition, it is 1510 DEG C that the opening of molten steel waters temperature, and roll casting speed is 35m/min, and molten steel carries out thin strap continuous casting under protection of inert gas.Obtaining thickness is the Cast Strip of 3mm.
(3) hot rolling: a time hot rolling that Cast Strip is 13% through draught subsequently becomes the strip of 2.6mm, hot-rolled temperature is 1050 DEG C.
(4) cool and batch: hot rolled thin strip is cooled to 600 DEG C with the speed of 45 DEG C/s, obtains hot rolled coil after batching, and then air cooling is to room temperature.
Table 1 embodiment 1 weathering steel mechanical property
Fig. 1 is the metallograph of the weathering steel that embodiment 1 obtains.As can be seen from the figure, steel, in whole thickness direction homogeneous microstructure, is mingled with existence without P segregation line and banded MnS.
Embodiment 2
(1) smelt: adopt molten iron pre-desulfurization, converter top bottom blowing, RH vacuum cycle deoxidization technique, carry out Calcium treatment simultaneously, LF refining, obtain the qualified molten steel of composition, be by weight percentage: C:0.07%, Si:0.33%, Mn:0.46%, P:0.09%, S:0.008%, Cr:0.80%, Ni:0.08%, Cu:0.3%, Al:0.04%, B:0.001%, surplus are iron and impurity element.
(2) thin strap continuous casting: adopt double roll strip casting rolling plant to carry out casting on molten steel qualified for composition, it is 1550 DEG C that the opening of molten steel waters temperature, and roll casting speed is 55m/min, and molten steel carries out thin strap continuous casting under protection of inert gas.Obtaining thickness is the Cast Strip of 2.0mm.
(3) hot rolling: a time hot rolling that Cast Strip is 19.9% through draught subsequently becomes the strip of 1.6mm, hot-rolled temperature is 950 DEG C.
(4) cool and batch: hot rolled thin strip is cooled to 520 DEG C with the speed of 30 DEG C/s, obtains hot rolled coil after batching, and then air cooling is to room temperature.
Table 2 embodiment 2 weathering steel mechanical property
Embodiment 3
(1) smelt: adopt molten iron pre-desulfurization, converter top bottom blowing, RH vacuum cycle deoxidization technique, carry out Calcium treatment simultaneously, LF refining, obtain the qualified molten steel of composition, be by weight percentage: C:0.11%, Si:0.46%, Mn:0.50%, P:0.13%, S:0.005%, Cr:0.70%, Ni:0.11%, Cu:0.4%, Al:0.03%, B:0.002%, surplus are iron and impurity element.
(2) thin strap continuous casting: adopt double roll strip casting rolling plant to carry out casting on molten steel qualified for composition, it is 1570 DEG C that the opening of molten steel waters temperature, and roll casting speed is 80m/min, and molten steel carries out thin strap continuous casting under protection of inert gas.Obtaining thickness is the Cast Strip of 1.2mm.
(3) hot rolling: a time hot rolling that Cast Strip is 5% through draught subsequently becomes the strip of 1.14mm, hot-rolled temperature is 860 DEG C.
(4) cool and batch: hot rolled thin strip is cooled to 550 DEG C with the speed of 20 DEG C/s, obtains hot rolled coil after batching, and then air cooling is to room temperature.
Table 3 embodiment 3 weathering steel mechanical property
Comparative example
Adopt molten iron pre-desulfurization, converter top bottom blowing, RH vacuum cycle deoxidization technique, carry out Calcium treatment simultaneously, LF refining, the weathering steel ingot casting that continuous casting becomes 220mm thick, composition is by weight percentage: the iron of C:0.07%, Si:0.33%, Mn:0.46%, P:0.09%, S:0.004%, Cr:0.60%, Ni:0.11%, Cu:0.3%, Al:0.03% and surplus and impurity element.
Above-mentioned ingot casting be heated to 1200 DEG C and be incubated 2h, carrying out equal thermal treatment.Become 35mm intermediate blank by the roughing of R1 with R2 two frame, and be incubated through Coil Box rewinding.Roughing draft is 85%, and roughing temperature out is 1050 DEG C.Again intermediate blank is become the band steel of 4mm through F1 ~ F7 seven frame tandem rolling.Strip finishing temperature is 880 DEG C, and coiling temperature is 660 DEG C.
Table 4 comparative example weathering steel mechanical property
Fig. 2 is the metallograph of comparative example weathering steel.As can be seen from the figure, there is obvious banded structure in steel, white band shape is organized as P segregation line, and the MnS that P segregation line inside comprises black is mingled with band.
Fig. 3 is the clod wash photo of comparative example weathering steel.As can be seen from the figure, there is P segregation line and MnS is mingled with the weathering steel of band in 90 ° of Cold Roll Forming Process, outside steel plate bending, occur serious cold bend cracking.
Fig. 4 infiltrates after test through 72 hours periods, the contrast of embodiment 1 weathering steel and comparative example weathering steel and Q235B straight carbon steel weather resistance.
In sum, the invention provides weathering steel hot rolled thin strip that a kind of novel low cost, non-stop layer P segregation and sheet MnS be mingled with and preparation method thereof.The mechanical property of comprehensive weathering steel and high durable performance, in the composition configuration of weathering steel, adopt high P to fill a prescription and improve weather resistance, add B element to improve the intensity of weathering steel simultaneously, in addition, reduces the content of Ni element to control the cost of weathering steel.Adopt method for continuous casting sheet band, the as-cast structure of weathering steel Cast Strip is made to avoid there is P segregation line and larger-size MnS is mingled with, Cast Strip adopts short-flow production method, directly obtain weathering steel hot rolled thin strip through the hot rolling of a time light reduction, while ensure that weathering steel performance and template, reduce the production cost of weathering steel.The weathering steel that the present invention relates to is applicable to the fields such as Production Container, railcar manufacture, building.
Finally, also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.
Claims (8)
1. without a weathering steel hot rolled thin strip for P segregation, it is characterized in that, its chemical composition comprises by mass percentage:
C：0.07～0.12％；
Si：0.30～0.50％；
Mn：0.4～0.55％；
P：0.06～0.15％；
S :≤0.02% and be greater than 0;
Cr：0.6～0.8％；
Ni：0.03～0.11％；
Cu：0.2～0.5％；
Al :≤0.046% and be greater than 0;
B :≤0.003% and be greater than 0,
Surplus is iron and impurity element.
2. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 1, is characterized in that, comprise step:
1), according to chemical composition according to claim 1 and ratio batching, smelt and obtain molten steel;
2), by step 1) molten steel that obtains carries out thin strap continuous casting, obtains Cast Strip;
3), to step 2) in Cast Strip carry out hot rolling, finally cool.
3. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 2, is characterized in that: described step 1) in, adopt molten iron pre-desulfurization, converter top bottom blowing, RH vacuum cycle deoxidization technique, carries out Calcium treatment simultaneously, LF refining, obtains the qualified molten steel of composition.
4. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 2; it is characterized in that: described step 2) in; double roll strip casting rolling plant is adopted by molten steel to carry out casting; it is 1500 ~ 1600 DEG C that the opening of molten steel waters temperature; roll casting speed is 30 ~ 100m/min, and molten steel carries out thin strap continuous casting under protection of inert gas.
5. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 4, is characterized in that: the thickness of described Cast Strip is 1.2 ~ 3.0mm.
6. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 2, is characterized in that: described step 3) in, a time hot rolling that described Cast Strip is 5% ~ 20% through draught becomes strip, and hot-rolled temperature is 850 ~ 1050 DEG C.
7. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 6, is characterized in that: the thickness of described strip is 1.0 ~ 2.6mm.
8. the manufacture method of the weathering steel hot rolled thin strip without P segregation according to claim 6, is characterized in that: the strip after described hot rolling is cooled to 500 ~ 600 DEG C with the speed of 5 ~ 50 DEG C/s, obtains hot rolled coil after batching, and then air cooling is to room temperature.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893950A (en) * | 2017-01-13 | 2017-06-27 | 唐山钢铁集团有限责任公司 | Low yield strength ratio cold rolling weather resisting steel and its production method |
| CN109338210A (en) * | 2017-09-27 | 2019-02-15 | 江苏沙钢集团有限公司 | A kind of acid-cleaning plate and its production method |
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| CN109338210A (en) * | 2017-09-27 | 2019-02-15 | 江苏沙钢集团有限公司 | A kind of acid-cleaning plate and its production method |
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| CN109338238B (en) * | 2018-04-18 | 2021-10-29 | 江苏沙钢集团有限公司 | Low-carbon steel for stamping based on thin strip casting and rolling and manufacturing method thereof |
| CN109881085A (en) * | 2018-08-08 | 2019-06-14 | 江苏沙钢集团有限公司 | Easy welding hot-rolled strip Q345 and its manufacturing method based on double-roller rolling |
| WO2020169077A1 (en) * | 2019-02-21 | 2020-08-27 | 江苏沙钢集团有限公司 | Low-cost weathering steel and production method thereof |
| CN110093568A (en) * | 2019-05-10 | 2019-08-06 | 包头钢铁（集团）有限责任公司 | A kind of high strength low yield ratio weathering resistant compartment weathering steel and preparation method thereof |
| CN111014603A (en) * | 2019-12-30 | 2020-04-17 | 江苏沙钢集团有限公司 | Double-roller casting-rolling production method of boron-added steel |
| CN111014603B (en) * | 2019-12-30 | 2022-02-25 | 江苏沙钢集团有限公司 | Double-roller casting-rolling production method of boron-added steel |
| CN111218607A (en) * | 2020-04-16 | 2020-06-02 | 江苏沙钢集团有限公司 | High-strength steel for seat sliding rail and method for producing high-strength steel based on thin strip casting |
| 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 |
| CN113201685A (en) * | 2021-03-25 | 2021-08-03 | 马鞍山钢铁股份有限公司 | Economical low-yield-ratio hot-rolled weather-resistant steel plate and manufacturing method thereof |
| CN113201685B (en) * | 2021-03-25 | 2022-06-14 | 马鞍山钢铁股份有限公司 | Economical low-yield-ratio hot-rolled weather-resistant steel plate and manufacturing method thereof |
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Effective date of registration: 20200512 Address after: Suzhou City, Jiangsu province 215625 Zhangjiagang City Jin Fengzhen road Yongxin Shagang Technology Building Co-patentee after: INSTITUTE OF RESEARCH OF IRON AND STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Patentee after: JIANGSU SHAGANG GROUP Co.,Ltd. Co-patentee after: ZHANGJIAGANG SINO-US ULTRA-THIN BELT TECHNOLOGY Co.,Ltd. Address before: Suzhou City, Jiangsu province 215625 Zhangjiagang City Jin Fengzhen Shagang science and technology building, Jiangsu Shagang Group Co. Co-patentee before: INSTITUTE OF RESEARCH OF IRON AND STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Patentee before: JIANGSU SHAGANG GROUP Co.,Ltd. |