CN1639371A - Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof - Google Patents
Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof Download PDFInfo
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- CN1639371A CN1639371A CNA03804658XA CN03804658A CN1639371A CN 1639371 A CN1639371 A CN 1639371A CN A03804658X A CNA03804658X A CN A03804658XA CN 03804658 A CN03804658 A CN 03804658A CN 1639371 A CN1639371 A CN 1639371A
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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
- 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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The present invention: provides a steel material that withstands bending work after blasting or the like and has weather resistance while securing an ultra-high strength of 700 MPa or higher in terms of yield strength, and a method for producing said steel sheet; and is a weather-resistant high strength steel sheet excellent in bendability, said steel sheet containing, in mass, C: 0.05 to 0.15%, Si: 0.5% or less, Mn: 0.5 to 2.0%, p: 0.02% or less, S: 0.005% or less, Ni: 0.2 to 2.0%, Cu: 0.2 to 0.5%, and Cr: 0.2 to 1.0%, and one or more of Ti: 0.03 to 0.2%, Nb: 0.01 to 0.07%, V: 0.01 to 0.07%, and B: 0.0005 to 0.0050%, with the balance consisting of Fe and unavoidable impurities, and being produced by heating it to a temperature of 1,200 DEG C or higher, thereafter finish-rolling it in the temperature range from 850 DEG C to 950 DEG C, and coiling it in the temperature range from 500 DEG C to 650 DEG C.
Description
Technical field
The processability, the rolling stock of weatherability and steel for container material and the manufacture method thereof that land route transportation, marine transportation are used that the present invention relates to behind desired strength, the shot-peening etc.
Background technology
In the past, be the material that requirement possesses light weight, long-life and weatherability for container, use the material of aluminium to become main flow. But, because price is high, intensity is low, so an urgent demand high strength and steel with weatherability. Up to the present weatherability steel have the hot strength of JIS G3125 regulation at 50kgf/mm2(490MPa) the high-weatherability rolled steel of level. In addition, as high strength steel, hot strength was once disclosed at 60kgf/mm in Unexamined Patent 3-2321 communique2Or the manufacture method of the good weather-resistant hot rolled steel sheet of above cold-workability.
And, follow the increase of the use actual achievement of marine container, the harsher Stuff (to) that is coated with even environment for use becomes, the situation that cannot stand long-term use owing to the generation of local corrosion increases. To this, in once disclosing for high P steel, JP 63-72853 communique added Nb, Ti, V, B can realize long lifetime.
But, in recent years the requirement of high strength and light-weighted container further improved, require yield strength at 700MPa or superhigh intensity weatherability steel above and that bendability is good. And the coating tack during take application and fatigue properties and surperficial hardening are target, wait after bead and carry out bending machining, and be therefore all very strict to intensity and the processability of steel requirement. Desired intensity is not hot strength but yield strength, even be owing to reach with superhigh intensity that light weight turns to target, therefore thickness of slab is thinner still needs to guarantee to keep rigidity. So disclosed composition and manufacture method can not satisfy this specification requirement in Unexamined Patent 3-2321 communique.
In addition, the composition system that proposes in the JP 63-72853 communique take the high life as target can be guaranteed the weatherability life-span, but cracks in shot-peening-bending machining of making container, so it does not satisfy this specification yet.
Summary of the invention
The objective of the invention is, guarantee that in order to solve above problem, to provide yield strength is in 700MPa or above superhigh intensity, the bending machining behind the anti-shot-peening etc. and possess steel and the manufacture method thereof of weatherability simultaneously.
The present invention's means to achieve these goals are as follows:
(1) a kind of weatherability high-strength steel sheet of has excellent bending properties is characterized in that: contain C:0.05～0.15%, Si:0.5% or following, Mn:0.5～2.0%, P:0.02 or following, S:0.005% or following, Ni:0.2～2.0%, Cu:0.2～0.5%, Cr:0.2～1.0% and contain among Ti:0.03～0.2%, Nb:0.01～0.07%, V:0.01～0.07%, B:0.0005～0.0050% a kind, 2 kinds or above, surplus as Fe and inevitable impurity take quality %.
(2) a kind of manufacture method of weatherability high-strength steel sheet of has excellent bending properties, it is characterized in that: used steel contains C:0.05～0.15%, Si:0.5% or following, Mn:0.5～2.0%, P:0.02% or following, S:0.005% or following, Ni:0.2～2.0%, Cu:0.2～0.5%, Cr:0.2～1.0% and contains among Ti:0.03～0.2%, Nb:0.01～0.07%, V:0.01～0.07%, B:0.0005～0.0050% a kind, 2 kinds or above, surplus as Fe and inevitable impurity take quality %, and described manufacture method comprises described steel after 1200 ℃ or above heating, make rolling termination, reel at 500 ℃～650 ℃ in 850 ℃～950 ℃ temperature ranges.
Below, be described in detail with regard to the restriction reason of steel plate of the present invention and manufacture method.
Description of drawings
Fig. 1 is that expression Ni amount and P measure the figure to the impact effect of corrosion decrement.
Fig. 2 is the schematic diagram of expression bending ram test.
Fig. 3 is that expression P is on the figure of the impact of corrosion decrement and bending radius (R).
The specific embodiment
The present inventor investigates the steel plate manufacture method of many steel grades in order to solve above-mentioned problem, has finally realized the present invention. Below, just the present invention is elaborated.
Usually, the weatherability steel are exposed between initial stage in the atmosphere as broad as long with common iron, get rusty equally. But, subsequently the part iron rust of weatherability steel become fine and close and adherence in the iron rust of mother metal, this iron rust becomes diaphragm, can stop environment to cause the development of iron rust. Making it contain Cu-Cr-P is effective to making such iron rust.
As in the past, be 50～60kgf/mm with hot strength2(490MPa～590MPa) is the occasion of the material of object, may be applicable to container weatherability steel according to this composition system. In recent years, be complementary with the earth environment problem, propose to improve fuel cost as the lightweight of the automobile of target, for the container that land route transportation, marine transportation are used, light-weighted requirement is also very strong. Therefore, in order to realize than in the past more light-weighted purpose, wish steel the attenuation of thickness of slab desired value, in order to ensure rigidity require yield strength 700MPa or more than. In addition, in the manufacturing of container, for better de-scaling and application are adhered to, surface of steel plate is given concavo-convex by the shot-peening of projection ball ball, sand grains, quartz sand etc. on steel plate. By means of this operation, harden in the surface, therefore causes easily bending crack in bending forming thereafter. Particularly yield strength surpasses the material of 700MPa, and crack sensitivity is remarkable, and the selected impact of adding element increases.
As mentioned above, for the steel of yield strength above 700MPa, when the weatherability steel of the bending machining of making ability shot-peening material, require to satisfy simultaneously:
1. the raising of steel strength;
2. guarantee the bending machining characteristic;
3. guarantee weatherability.
Manufacturing with high strength steel of such weatherability produces various problems when using the P of volume. At first, in manufacturing process, during to the slab of 300mm, P causes center segregation easily, to the thickness of slab centre enrichment of final set in casting 200mm. The enrichment positions of P causes brittle crack easily. And the crack sensitivity of high strength steel own is higher, and the weatherability high-strength steel sheet that therefore adds P often produces the slab crackle, and lumber recovery is very low.
In addition, even be processed into steel plate, because its material characteristic of interpolation of P is more crisp, processability is bad. Usually, high strength steel, percentage elongation is lower, the processability of steel of therefore adding P is lower, and current to as if behind shot-peening, wait and carry out bending machining, so cause easily bending crack. In addition, the occasion that container is assembled by welding also causes weld crack easily. Cu, the Cr that in the past steel is used as the weatherability element, the characteristic of P are distinguished through the result of probe: for high strength steel, P is very large to above-mentioned adverse effect 2., can not use. The present inventor changes the bending radius (R) of nose of punch, the generation condition of investigation P amount and bending crack in 90 ° of bending ram tests shown in Figure 2. Also investigated simultaneously and added P and the relation of corroding decrement, be shown in Fig. 3. The result shows, follows the increase of P, and the corrosion decrement reduces, and weather resisteant improves, but along with the bending radius (R) of the increase bending crack limit of P increases, it is severe that the bendability of steel plate becomes. Therefore, in order to ensure bendability, be necessary to discuss the method for not using P and guaranteeing weatherability. About Cu and Cr, less to the adverse effect of bendability, but the amount that only increases them guarantees that weatherability also is difficult to. And, can not bear the bending machining that waits behind the shot-peening.
Therefore, through repeatedly carrying out found that of various experiments, guarantee that by replacing P it is possible that weatherability is used Ni; For guaranteeing that the bending machining characteristic when seeking to improve processability by low carbonization, reduces the interpolation of P as far as possible, and for reduce to flexural property bring adverse effect MnS generation and reduce S as far as possible; The intensity adjustment is then replenished by means of the utilization of separating out effect of a kind among Ti, Nb, V, the B, 2 kinds or above combination, and discovery can be reached this purpose.
Fig. 1 represents that Ni and P measure the comparison to the impact effect of corrosion decrement. Can see, follow the increase of Ni, the corrosion decrement reduces, and can access the same effect of occasion of adding with P.
And Ni is different from P, does not occur segregation when slab casting, needn't worry the slab crackle, and lumber recovery is good. Nor produce the problem of processability, weldability, bending machining and the weld crack that therefore needn't worry to wait behind the shot-peening, be the weatherability steel high-strength steel sheet of has excellent bending properties very suitable element on making. About weatherability, by bringing into play its effect with also using of Cu, Cr.
The present inventor tests repeatedly take these conditions as benchmark, realizes the present invention. Restriction reason about interpolation element of the present invention is described in detail as follows.
C:C uses as carrying high-intensity element. Except using as solution strengthening, form carbide with Ti and Nb, also can use as precipitation strength. But, processability is reduced. Steel strength is higher, and processability is lower, so C measures low being advisable. Lower limit determine 0.05% be since when lower than it yield strength be difficult to guarantee 700MPa or above cause. And, the upper limit determine 0.15% or below be crackle in order to prevent that bending machining from causing.
Si:Si forms fayalite (2FeOSiO at surface of steel plate2), make the remaining fine Fe of outmost surface2O
3, be the element that produces easily the red oxidization skin. When surface of steel plate forms the red oxidization skin, become the pit shape, kept someone at a respectful distance by the user. In order to prevent pit, the Si upper content limit is determined 0.5%.
Mn: be the essential elements that improves steel strength. When being less than 0.5%, be difficult to make high strength steel. In addition, when addition surpasses 2.0%, keep the processability difficult, therefore determine the scope 0.5～2.0%.
P: be intensity to be raise effectively and to weatherability improve useful element, be used for the weatherability steel in the past always. But, for the manufacturing of the yield strength superhigh intensity steel such above 700MPa, when making, steel become the cause of slab embrittlement, and weldability is also deteriorated. And also variation of bendability, therefore be not added to suitablely as far as possible, the upper limit is determined 0.02%.
S:S and Mn form sulfide M nS. This sulfide is out of shape easily, elongates by rolling, is present in the steel. MnS makes the bendability of steel, processability deteriorated. High strength steel particularly in order to improve crack sensitivity, is reduced to suitablely as far as possible, as the commercial limit that may reach, determines 0.005%.
Ni:Ni is to raising intensity, simultaneously to improving weatherability, preventing that embrittlement from also being effective element. Effective for the weatherability under the large environment of salinity effect particularly. In high strength steel as described above, effective P demonstrates obvious adverse effect to processability to weatherability, therefore can not use. Ni can use as its substitute element, can not resemble to occur the slab crackle the P and make the processability of steel deteriorated. In order effectively to use the feature of weatherability, need to add 0.2% or more than. On the other hand, Ni is the metal of high price, even surpass 2.0%, effect does not change yet, so the upper limit is determined 2.0%. Container all can use in sea-freight and land route transportation, the impact of the salinity of the defrost salt that be subjected to the impact of the salinity of seawater at sea, fallen apart by cold district to spread on land, so Ni is the important element of weatherability. Under the environment beyond the salt, in order to bring into play the effect of following Cu, Cr element, it is effective adding in the lump weatherability.
Cu:Cu is very important to improving weatherability, is effective element to the formation of stablizing iron rust. As the effect to corrosive environment, 0.2% or more than be necessary, if but surpass 0.5%, then cause easily blemish, therefore determine 0.2～0.5%.
Cr:Cr is also very important to improving weatherability, also is effective element to the formation of stablizing iron rust. As the effect to corrosive environment, 0.2% or more than be necessary. But even surpass 1.0%, effect does not change yet, and therefore determines 0.2～1.0%. Surpass the steel of 700MPa in order to make yield strength, the utilization of separating out intensity is effective. For utilizing following 4 kinds of elements of separating out effect, undercapacity is replenished, use a kind, 2 kinds or above can achieving the goal.
Ti: form carbide and nitride with C and N, the intensity of steel is improved. 0.03% or above interpolation show its effect, even add 0.2% or above its effect also constant.
Nb: form carbide and nitride with C and N, the intensity of steel is improved. 0.01% or above interpolation show its effect, even add 0.07% or above its effect also constant.
V: form carbide and nitride with C and N, the intensity of steel is improved. 0.01% or above interpolation show its effect, even add 0.07% or above its effect also constant.
B: form carbide and nitride with C and N, effective to the raising of hardenability simultaneously, be that intensity is improved effective element. 0.0005% or above interpolation show its effect, even add 0.0050% or above its effect also constant.
Secondly, the restriction reason of just creating conditions is narrated.
Heating-up temperature determine 1200 ℃ or more than, be in order to utilize the effect of separating out of Ti, Nb, V, B, generate fine precipitate when making carbide and nitride solid solution that steel plate is made in the slab stage and take full advantage of and separate out effect.
In order to make the precipitate miniaturization, final rolling temperature 850 ℃ or above be necessary, if surpass 950 ℃, produce easily the problems such as thickization of crystal grain and scale, so the final rolling temperature scope is determined at 850 ℃～950 ℃.
The coiling temperature exerts an influence to the size of precipitate, and the situation of separating out effect is changed. When high temperature was reeled, precipitate was grown up, and growing up excessively reduces intensity effect. In addition, the coiling temperature is crossed when hanging down, and then the generation of precipitate is insufficient, can not wish that intensity raises. Therefore, the temperature range that is expected the appropriateness of intensity rising is determined at 500 ℃～650 ℃.
During fabrication, there is not any problem in the utilization of the utilization of high pressure descaling and made-up belt heater (バ one ヒ one one), the hot rolling serialization of the joint made-up belt after the rolling roughing yet, makes the heating process ability improve, can seek simultaneously the raising of preventing of scale and lumber recovery by using these equipment.
Embodiment
After steel numbering system 1～12 tapping according to the various compositions shown in the table 1, make steel, cut test portion with the rolling condition shown in the table 2, its characteristic of bead post-evaluation is carried out on the surface. Evaluation is by stretching test measurement yield strength, hot strength, percentage of total elongation. And using angle of bend is that 90 ℃, the bending radius (R) of end carry out bending machining as the drift of 3mm, and the investigation crooked position has flawless.
Weldability is to be judged by the flawless that has of the welding position after the arc welding. Weatherability is to carry out repeatedly doing after brine spray is processed the test of moistening～dry promotion corrosion, removes the test portion weight behind the iron rust after the test portion weight before the determination test and the test, obtains the corrosion decrement. As a comparison, take the data of commercially available 490MPa level Cole smooth (Cor-ten) atmospheric corrosion resistant steel as benchmark, the occasion of Duoing than this benchmark in the corrosion decrement is estimated with " zero " in equal or following occasion with " * " evaluation.
In addition, observe the surperficial evaluation table surface state of the steel after rolling. The rolling condition of test number 1～12 is all implemented in condition of the present invention. The Ni content of test number 7 is few, and weatherability is poor. The good weatherability of numbering 8, but owing to contain more P, therefore when welding and bending machining, crack. Cu amount many owing to the Si amount of numbering 9, numbering 10 is too much, so the folding and decorative pattern of their surface generation squamous, and surface state is bad. Numbering 11 C, Mn amount is too high, so bending machining and weldability are bad. The S amount of numbering 12 is high, therefore cracks in bend test.
Test number 13～17 uses the steel numbering system 2 of the scope of the invention and changes rolling condition. Therefore numbering 13 can not utilize precipitation strength because heating-up temperature is excessively low, and fails to surpass the Yield strength 700 MPa of target. Numbering 14 is because rolling temperature is high, so surface state is bad. In addition, therefore numbering 15 does not produce the invigoration effect that the precipitate miniaturization causes because rolling temperature is low, fails to obtain the intensity of target. Therefore numbering 16 causes the softening of steel because the coiling temperature is high, still can not obtain target strength. Numbering 17 is because the coiling temperature is excessively low, so the intensity rising, but hardened layer increases, and cracks after the bending machining.
Satisfy the test number 1 to 6 of composition range of the present invention and rolling condition, satisfy various characteristics, obtained good evaluation result.
And, test number 18 to 20 of the present invention, when being hot rolling after roughing its thick made-up belt remove the oxide skin on surface, then heat thick made-up belt by the made-up belt heater and carry out thick made-up belt to engage and use the example of hot rolling serialization through high pressure descaling, all satisfy material behavior value of the present invention, and have each operation produce an effect of flexible utilization. Numbering 18 is utilized the made-up belt heater, because the temperature of thick made-up belt is higher and even before finish rolling, therefore separate out control and carry out equably, the material inhomogeneities in the material reduces, and the percentage elongation inhomogeneities about 6% is reduced to 3.8% from what this rank had usually. The examples that utilize high pressure descaling and hot rolling serialization and number 19. By high pressure descaling, the steel surface state has been improved extraordinarily. And because the hot rolling serialization, the shape of steel roll end is good, and the lumber recovery of material brings up to 97% from common about 95%. In addition, numbering 20 is the examples that utilize made-up belt heater and hot rolling serialization, the inhomogeneities of percentage elongation be reduced to 3.2% and the material lumber recovery bring up to 98%.
Table 1 material composition (quality %)
| Steel numbering system | C | Si | Mn | P | S | Al | N | Cu | Ni | Cr | Ti | Nb | V | B | |
| Example | 1 | 0.07 | 0.29 | 1.41 | 0.006 | 0.002 | 0.033 | 0.006 | 0.25 | 1.80 | 0.31 | 0.078 | 0.031 | - | - |
| 2 | 0.11 | 0.18 | 0.88 | 0.011 | 0.001 | 0.025 | 0.004 | 0.28 | 1.00 | 0.39 | 0.085 | 0.037 | - | - | |
| 3 | 0.08 | 0.10 | 1.22 | 0.008 | 0.002 | 0.011 | 0.003 | 0.23 | 0.50 | 0.39 | 0.082 | 0.024 | 0.025 | 0.0012 | |
| 4 | 0.09 | 0.03 | 1.11 | 0.006 | 0.002 | 0.030 | 0.004 | 0.48 | 0.25 | 0.81 | 0.142 | 0.055 | - | - | |
| 5 | 0.14 | 0.43 | 0.62 | 0.016 | 0.004 | 0.022 | 0.003 | 0.44 | 0.65 | 0.30 | 0.180 | - | - | - | |
| 6 | 0.05 | 0.04 | 1.86 | 0.005 | 0.003 | 0.056 | 0.005 | 0.31 | 1.20 | 0.52 | 0.052 | 0.043 | 0.045 | - | |
| Comparative example | 7 | 0.08 | 0.22 | 1.33 | 0.012 | 0.002 | 0.032 | 0.004 | 0.42 | 0.18 | 0.17 | 0.089 | 0.033 | - | - |
| 8 | 0.09 | 0.30 | 2.10 | 0.091 | 0.004 | 0.017 | 0.006 | 0.27 | 0.35 | 0.38 | 0.080 | 0.040 | - | - | |
| 9 | 0.12 | 0.75 | 0.95 | 0.011 | 0.002 | 0.043 | 0.004 | 0.41 | 0.65 | 0.82 | 0.090 | 0.033 | 0.033 | - | |
| 10 | 0.09 | 0.25 | 0.20 | 0.005 | 0.001 | 0.020 | 0.003 | 0.55 | 0.23 | 0.30 | 0.120 | 0.052 | - | 0.0036 | |
| 11 | 0.23 | 0.48 | 2.50 | 0.028 | 0.004 | 0.017 | 0.006 | 0.48 | 1.90 | 0.90 | - | - | - | - | |
| 12 | 0.08 | 0.21 | 1.50 | 0.007 | 0.008 | 0.380 | 0.005 | 0.38 | 0.85 | 0.55 | 0.090 | 0.041 | - | 0.0008 |
(notes): the part that indicates horizontal line below it represents the condition that the scope of the invention is outer.
Table 2 is created conditions and is estimated
| Test number | Steel numbering system | Heating-up temperature ℃ | Rolling temperature ℃ | Coiling temperature ℃ | Yield strength (MPa) | Hot strength (MPa) | Percentage elongation (%) | Bending machining | Weldability | Weatherability | Surface state | Remarks | |
| Example | 1 | 1 | 1220 | 900 | 530 | 740 | 830 | 22 | ○ | ○ | ○ | ○ | |
| 2 | 2 | 1220 | 910 | 520 | 746 | 857 | 22 | ○ | ○ | ○ | ○ | ||
| 3 | 3 | 1220 | 870 | 550 | 708 | 805 | 23 | ○ | ○ | ○ | ○ | ||
| 4 | 4 | 1250 | 920 | 620 | 878 | 1009 | 20 | ○ | ○ | ○ | ○ | ||
| 5 | 5 | 1250 | 900 | 590 | 876 | 1007 | 20 | ○ | ○ | ○ | ○ | ||
| 6 | 6 | 1230 | 900 | 520 | 712 | 814 | 23 | ○ | ○ | ○ | ○ | ||
| Comparative example | 7 | 7 | 1230 | 890 | 510 | 707 | 813 | 23 | ○ | ○ | × | ○ | Ni is few |
| 8 | 8 | 1250 | 880 | 630 | 711 | 818 | 19 | × | × | ○ | ○ | The P amount is many | |
| 9 | 9 | 1210 | 910 | 550 | 776 | 892 | 21 | ○ | ○ | ○ | × | The Si amount is many | |
| 10 | 10 | 1210 | 910 | 600 | 834 | 959 | 20 | ○ | ○ | ○ | × | The Cu amount is many | |
| 11 | 11 | 1230 | 900 | 530 | 537 | 618 | 18 | × | × | ○ | ○ | C, the Mn volume | |
| 12 | 12 | 1260 | 900 | 520 | 771 | 886 | 21 | × | ○ | ○ | ○ | The S amount is many | |
| 13 | 2 | 1150 | 900 | 530 | 680 | 755 | 24 | ○ | ○ | ○ | ○ | Heating-up temperature is low | |
| 14 | 2 | 1220 | 980 | 520 | 692 | 807 | 23 | ○ | ○ | ○ | × | Rolling temperature is high | |
| 15 | 2 | 1230 | 820 | 590 | 672 | 805 | 19 | × | ○ | ○ | ○ | Rolling temperature is low | |
| 16 | 2 | 1220 | 930 | 680 | 690 | 782 | 21 | ○ | ○ | ○ | ○ | The coiling temperature is high | |
| 17 | 2 | 1240 | 920 | 450 | 802 | 890 | 17 | × | ○ | ○ | ○ | The coiling temperature is low | |
| Example | 18 | 2 | 1210 | 870 | 530 | 752 | 862 | 23 | ○ | ○ | ○ | ○ | By utilizing the made-up belt heater, the percentage elongation inhomogeneities is reduced to 3.8%. |
| 19 | 3 | 1220 | 920 | 560 | 705 | 810 | 21 | ○ | ○ | ○ | ○ | Especially improved surface state by high pressure descaling. The hot rolling serialization makes the material lumber recovery bring up to 97%. | |
| 20 | 5 | 1210 | 920 | 600 | 877 | 982 | 20 | ○ | ○ | ○ | ○ | Utilize in the time of by made-up belt heater and rolling serialization, the elongation inhomogeneities is reduced to 3.8%, the material lumber recovery brings up to 98%. |
Bending machining: there is flawless judgement 90 ° of crooked punching press rear bending parts. Bending radius (R)=3mm; There is the occasion of crackle to represent with " * "; Flawless occasion represents with " zero ".
Weldability: the welding position after the arc welding has the occasion of crackle to represent with " * "; Flawless occasion represents with " zero ".
Weatherability: take in the past the smooth atmospheric corrosion resistant steel of 490MPa level Cole as benchmark, the corrosion decrement represents with " * " than its occasion of Duoing; Represent with " zero " than its occasion of lacking.
(notes): the part that indicates horizontal line below it represents the condition that the scope of the invention is outer.
Steel constructed in accordance have high strength, possess bendability and weatherability simultaneously. By using these steel can seek the lightweight that container etc. requires the steel of weatherability, and owing to possess weatherability, so the life-span is long. So, can obtain because the economic effect that lightweight is favourable to environmental protection and the long-life brings.
Claims (2)
1. the weatherability high-strength steel sheet of a has excellent bending properties is characterized in that: contain C:0.05～0.15%, Si:0.5% or following, Mn:0.5～2.0%, P:0.02 or following, S:0.005% or following, Ni:0.2～2.0%, Cu:0.2～0.5 %, Cr:0.2～1.0% and contain among Ti:0.03～0.2%, Nb:0.01～0.07%, V:0.01～0.07%, B:0.0005～0.0050% a kind, 2 kinds or above, surplus as Fe and inevitable impurity take quality %.
2. the manufacture method of the weatherability high-strength steel sheet of a has excellent bending properties, it is characterized in that: used steel contains C:0.05～0.15%, Si:0.5% or following, Mn:0.5～2.0%, P:0.02% or following, S:0.005% or following, Ni:0.2～2.0 %, Cu:0.2～0.5%, Cr:0.2～1.0% and contains among Ti:0.03～0.2%, Nb:0.01～0.07%, V:0.01～0.07%, B:0.0005～0.0050% a kind, 2 kinds or above, surplus as Fe and inevitable impurity take quality %, and described manufacture method comprises described steel after 1200 ℃ or above heating, make rolling termination, reel at 500 ℃～650 ℃ in 850 ℃～950 ℃ temperature ranges.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP050869/2002 | 2002-02-27 | ||
| JP2002050869A JP3940301B2 (en) | 2002-02-27 | 2002-02-27 | Blasting weathering high-strength steel plate with excellent bending resistance and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1639371A true CN1639371A (en) | 2005-07-13 |
| CN1297681C CN1297681C (en) | 2007-01-31 |
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ID=27764290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB03804658XA Expired - Fee Related CN1297681C (en) | 2002-02-27 | 2003-01-24 | Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1486580B2 (en) |
| JP (1) | JP3940301B2 (en) |
| CN (1) | CN1297681C (en) |
| ES (1) | ES2381356T5 (en) |
| TW (1) | TWI284154B (en) |
| WO (1) | WO2003072841A1 (en) |
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2002
- 2002-02-27 JP JP2002050869A patent/JP3940301B2/en not_active Expired - Lifetime
-
2003
- 2003-01-24 WO PCT/JP2003/000676 patent/WO2003072841A1/en active Application Filing
- 2003-01-24 EP EP03742886.9A patent/EP1486580B2/en not_active Expired - Fee Related
- 2003-01-24 CN CNB03804658XA patent/CN1297681C/en not_active Expired - Fee Related
- 2003-01-24 ES ES03742886.9T patent/ES2381356T5/en not_active Expired - Lifetime
- 2003-02-10 TW TW092102678A patent/TWI284154B/en not_active IP Right Cessation
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1297681C (en) | 2007-01-31 |
| EP1486580A4 (en) | 2006-08-30 |
| EP1486580A1 (en) | 2004-12-15 |
| ES2381356T5 (en) | 2017-04-05 |
| EP1486580B9 (en) | 2015-04-22 |
| TW200303367A (en) | 2003-09-01 |
| EP1486580B2 (en) | 2016-09-07 |
| TWI284154B (en) | 2007-07-21 |
| JP2003253382A (en) | 2003-09-10 |
| WO2003072841A1 (en) | 2003-09-04 |
| EP1486580B1 (en) | 2012-03-07 |
| ES2381356T3 (en) | 2012-05-25 |
| JP3940301B2 (en) | 2007-07-04 |
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