KR20150101733A - Hot-rolled steel sheet and method of manufacturing the same - Google Patents
Hot-rolled steel sheet and method of manufacturing the same Download PDFInfo
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- KR20150101733A KR20150101733A KR1020140023377A KR20140023377A KR20150101733A KR 20150101733 A KR20150101733 A KR 20150101733A KR 1020140023377 A KR1020140023377 A KR 1020140023377A KR 20140023377 A KR20140023377 A KR 20140023377A KR 20150101733 A KR20150101733 A KR 20150101733A
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- hot
- steel sheet
- cooling
- rolled steel
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- 229910000831 Steel Inorganic materials 0.000 title abstract description 35
- 239000010959 steel Substances 0.000 title abstract description 35
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 33
- 239000010949 copper Substances 0.000 claims description 21
- 239000011651 chromium Substances 0.000 claims description 20
- 239000010955 niobium Substances 0.000 claims description 17
- 239000011572 manganese Substances 0.000 claims description 16
- 229910001563 bainite Inorganic materials 0.000 claims description 14
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 229910052758 niobium Inorganic materials 0.000 claims description 10
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 abstract description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
-
- 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
-
- 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
-
- 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
Description
The present invention relates to a hot rolled steel sheet manufacturing technique, and more particularly, to a hot rolled steel sheet having high strength, high solidity formation and weather resistance and a manufacturing method thereof.
A steel sheet having excellent weather resistance has a characteristic of having high atmospheric corrosion resistance compared to a general steel sheet. These weathering steels are mainly used in the atmosphere exposed to the air, such as bridges, transmission towers, containers, and power plant dust collector plates.
On the other hand, automobile hot-rolled steel sheets are required to have various properties such as high strength and high porosity, excellent durability, welding characteristics and corrosion resistance, depending on the application. Parts such as chassis components are exposed to the corrosive environment and require corrosion resistance.
The background art related to the present invention is a high-strength weather-resistant steel sheet excellent in low-temperature toughness welded joints disclosed in Korean Patent Laid-Open Publication No. 10-2012-0044139 (published on May 21, 2012).
An object of the present invention is to provide a hot-rolled steel sheet excellent in strength, moldability and weather resistance and a method for producing the same.
(A) 0.05 to 0.09% of carbon (C), 0.12 to 0.18% of silicon (Si), and manganese (Mn) in weight percent, (S): 0.02% or less, copper (Cu): 0.2-0.4%, chromium (Cr): 0.4-0.6%, nickel (Ni) 0.18% and niobium (Nb): 0.03-0.1%, and reheating the slab plate made of the remaining iron (Fe) and unavoidable impurities at 1200 ° C or higher; (b) hot rolling the reheated plate at a finish rolling temperature of 860 to 900 캜; And (c) cooling the hot-rolled plate material at 440 to 480 ° C.
At this time, it is preferable that the cooling in the step (c) is performed by a shear quenching method. In this case, the cooling in the step (c) may include a step of firstly cooling the hot-rolled plate to 600 to 700 ° C at an average cooling rate of 50 ° C / sec or more, a step of cooling the primary cooled plate at a temperature of 10 to 50 ° C / It is more preferable to include a step of secondary cooling to the coiling temperature at an average cooling rate.
In order to achieve the above object, the hot-rolled steel sheet according to an embodiment of the present invention includes 0.05 to 0.09% of carbon (C), 0.12 to 0.18% of silicon (Si), 1.2 to 1.8% of manganese (Mn) (P): not more than 0.02%, sulfur (S): not more than 0.02%, copper (Cu): 0.2 to 0.4%, chromium (Cr): 0.4 to 0.6%, nickel (Ni) Nb): 0.03 to 0.1%, and is composed of the remaining iron (Fe) and unavoidable impurities, and has a composite structure containing ferrite and bainite.
At this time, it is preferable that the area ratio of the bainite is 15 to 20%.
The hot-rolled steel sheet may exhibit a tensile strength of 600 MPa or more and an elongation of 20% or more.
According to the method of manufacturing a hot-rolled steel sheet according to the present invention, strength and weather resistance can be secured through control of synthetic components such as copper (Cu), chrome (Cr), and nickel (Ni) By forming a composite structure containing a nitride, high moldability and high moldability can be secured.
1 is a flowchart schematically showing a method of manufacturing a hot-rolled steel sheet according to an embodiment of the present invention.
Fig. 2 shows the tensile test results of the specimen according to Example 1 and Comparative Example 1. Fig.
Fig. 3 shows the microstructure of the specimen produced according to Comparative Example 1. Fig.
Fig. 4 shows the microstructure of the specimen produced according to Example 1. Fig.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.
Hereinafter, a hot rolled steel sheet according to an embodiment of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.
Hot-rolled steel sheet
The hot-rolled steel sheet according to the present invention contains 0.05 to 0.09% of carbon (C), 0.12 to 0.18% of silicon (Si), 1.2 to 1.8% of manganese (Mn) , Sulfur (S): 0.02% or less, copper (Cu): 0.2 to 0.4%, chromium (Cr): 0.4 to 0.6%, nickel (Ni): 0.12 to 0.18%, and niobium (Nb) .
The rest of the above components are composed of iron (Fe) and impurities inevitably included in the steelmaking process and the like.
Hereinafter, the role and content of each component included in the hot-rolled steel sheet according to the present invention will be described.
Carbon (C)
Carbon contributes to securing strength.
The carbon is a structure in which the martensite structure of the total weight of the steel sheet contains supersaturated carbon due to the non-diffusion transformation in the austenite structure, and carbon contributes to formation of the martensite structure.
The carbon is preferably added in an amount of 0.05 to 0.09% by weight based on the total weight of the steel sheet. When the addition amount of carbon is less than 0.05% by weight, the effect of addition is insufficient. On the other hand, when the addition amount of carbon is more than 0.09% by weight, it is difficult to secure an elongation of 20% or more together with deterioration of weldability.
Silicon (Si)
Silicon (Si) acts as a deoxidizer and contributes to strength improvement.
The silicon is preferably added in an amount of 0.12 to 0.18% by weight based on the total weight of the steel sheet. If the addition amount of silicon is less than 0.12% by weight, the effect of the addition is insufficient. On the contrary, when the addition amount of silicon exceeds 0.18% by weight, there is a problem in lowering of weldability and lowering of plating ability.
Manganese (Mn)
Manganese contributes to strength improvement.
The manganese is preferably contained in an amount of 1.2 to 1.8% by weight based on the total weight of the steel sheet. When the content of manganese is less than 1.2% by weight, the effect of addition thereof is insufficient. On the other hand, when the content of manganese exceeds 1.8 wt%, the moldability is deteriorated and surface quality of the manganese can be caused by oxidation of the surface.
Phosphorus (P), sulfur (S)
Phosphorus (P) and sulfur (S) are elements that degrade the durability of the steel sheet.
Therefore, in the present invention, the content of phosphorus and sulfur is limited to 0.02 wt% or less of the total weight of the steel sheet.
Copper (Cu), chromium (Cr), nickel (Ni)
Copper (Cu), chromium (Cr), and nickel (Ni) are elements contributing to improvement in strength as well as improvement in weather resistance.
The copper, chromium and nickel are preferably added in an amount of 0.2 to 0.4% by weight of copper (Cu), 0.4 to 0.6% by weight of chromium (Cr) and 0.12 to 0.18% by weight of nickel (Ni) . If the content of copper, chromium or nickel is less than the above range, it may become difficult to secure weatherability. Conversely, when the content of copper, chromium or nickel exceeds the above range, only the formability can be lowered without further improving the weatherability.
Niobium (Nb)
Niobium (Nb) contributes to the improvement of the strength of the steel sheet through the formation of precipitates.
The niobium is preferably contained in an amount of 0.03 to 0.1% by weight based on the total weight of the steel sheet. When the content of niobium is less than 0.03% by weight, the effect of the addition is insufficient. On the other hand, when the content of niobium exceeds 0.1 wt%, the yield strength may excessively increase, and excessively large precipitates may be formed during hot rolling, so that the rolling property may be deteriorated.
The hot-rolled steel sheet according to the present invention can exhibit a composite structure including ferrite and bainite by the above-described alloy components and the process control described later, and can exhibit excellent moldability together with high strength.
In addition, the hot-rolled steel sheet according to the present invention can exhibit a tensile strength of 600 MPa or more, an elongation of 20% or more, and a hole expansion ratio of 70% or more in terms of mechanical properties. These mechanical properties can be obtained from microstructures where the bainite is 15 to 20% by area and the remainder is substantially ferrite. When the bainite content is in the above range and the bainite content is less than 15% or the bainite content is more than 20%, it is difficult to secure a tensile strength of 600 MPa or more and to secure an elongation of 20% or more.
Hot-rolled steel sheet manufacturing method
1 is a flowchart schematically showing a method of manufacturing a steel sheet according to an embodiment of the present invention.
Referring to FIG. 1, a steel sheet manufacturing method according to the present invention includes a slab reheating step (S110), a hot rolling step (S120), and a cooling / winding step (S130).
First, in the slab reheating step S110, the slab plate having the above-described alloy composition is reheated. The reheating is preferably performed at a temperature of 1200 ° C or higher, more specifically, 1200 to 1300 ° C for about 1 to 3 hours so that niobium can be reused.
Next, in the hot rolling step (S120), the reheated plate is subjected to hot rolling at about 1000 to 1050 DEG C, followed by finish rolling at 860 to 900 DEG C. If the finishing rolling temperature exceeds 900 캜, it may be difficult to secure moldability. If the finishing rolling temperature is lower than 860 캜, the quality of the steel sheet may deteriorate due to abnormal reverse rolling.
Next, in the cooling / winding step (S130), the hot-rolled plate is cooled and wound at 440 to 480 캜. When the cooling end temperature is less than 440 캜, it is difficult to secure an elongation of 20% or more. When the cooling end temperature exceeds 480 캜, it may be difficult to secure a tensile strength of 600 MPa or more.
At this time, it is preferable that the cooling is performed by a shear-quenching method. When performing cooling on ROT (Run Out TaBle), there are STEP cooling method that maintains a constant cooling rate throughout the process, and shear quenching method where it is quenched at the front end and gradually cooled at the rear end. At this time, the inventors of the present invention have found that although the tensile strength is excellent but the elongation is less than 20% in the case of the step cooling method, when the shear quenching method is used, a tensile strength of 600 MPa or more and an elongation of 20% I found out.
More preferably, the cooling is performed by first cooling the hot-rolled plate to 600-700 占 폚 at an average cooling rate of 50 占 폚 / sec or higher, cooling the primary cooled plate at an average cooling rate of 10-50 占 폚 / sec Lt; RTI ID = 0.0 > temperature. ≪ / RTI > It is possible to secure a sufficient ferrite fraction while suppressing the grain growth and to ensure the formability by performing the primary cooling at a temperature of 600 ° C to 700 ° C at a rate of 50 ° C / By performing secondary cooling at a cooling rate, a bainite structure can be formed while suppressing pearlite transformation.
Example
Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense. The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.
1. Manufacture of steel sheet
The slab plate containing the components listed in Table 1 and consisting of the remaining iron and impurities was reheated at 1250 占 폚 for 2 hours and then hot rolled at 1020 占 폚 and finish-rolled at 880 占 폚.
Thereafter, in Examples 1 and 2, the hot-rolled plate was first cooled at an average cooling rate of 100 ° C / sec up to 600 ° C, and then cooled to 460 ° C at an average cooling rate of 20 ° C / sec.
In Comparative Example 1, the hot-rolled plate was cooled to 460 DEG C at a constant cooling rate of 50 DEG C / sec.
In Comparative Example 2, the hot-rolled plate was cooled to 640 DEG C at a constant cooling rate of 50 DEG C / sec.
[Table 1] (unit:% by weight)
2. Evaluation of mechanical properties
Table 2 shows the results of the tensile test and the hole expandability test for the specimens according to Examples 1 and 2 and Comparative Examples 1 and 2.
[Table 2]
Referring to Table 2, in the case of the specimens according to Examples 1 and 2 satisfying the alloy composition and process conditions described in the present invention, a tensile strength of 600 MPa or more and an elongation of 20% or more can be achieved at the same time.
On the contrary, the specimen according to Comparative Example 1 to which the step cooling was applied showed excellent strength but the elongation was less than 20%. In addition, the tensile strength of the specimens according to 2 was less than 600 MPa in comparison with the coiling temperature being relatively high.
Figs. 3 and 4 show the microstructure of the specimen prepared according to Comparative Example 1 and Example 1. Fig.
3 and 4, the specimen according to Comparative Example 1 (FIG. 3) and the specimen according to Example 1 are common in that they are microstructures composed of ferrite and bainite. However, in the case of the test piece according to Comparative Example 1, the bainite area ratio was about 43%, which was relatively higher than that of Example 1, which was about 18%.
In the case of the microstructure including the high bainite as in Comparative Example 1, as can be seen from Table 2, it is greatly helpful to improve the strength, but the tensile strength of 600 MPa or more and the elongation of 20% Is difficult. However, in the case of a microstructure containing 15 to 20% bainite at the same area ratio as in Example 1, it is possible to achieve a tensile strength of 600 MPa or more and an elongation of 20% or more at the same time.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Such changes and modifications are intended to fall within the scope of the present invention unless they depart from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.
Claims (6)
(b) hot rolling the reheated plate at a finish rolling temperature of 860 to 900 캜; And
(c) cooling the hot-rolled plate and winding the hot-rolled plate at 440 to 480 ° C.
Wherein the cooling in the step (c) is performed by a shear-quenching method.
The cooling in step (c)
Firstly cooling the hot-rolled plate to 600 to 700 占 폚 at an average cooling rate of 50 占 폚 / sec or more,
And secondarily cooling the primary cooled plate to a coiling temperature at an average cooling rate of 10 to 50 DEG C / sec.
And a composite structure containing ferrite and bainite.
Wherein said bainite has an area ratio of 15 to 20%.
The hot-
A tensile strength of 600 MPa or more, and an elongation of 20% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140023377A KR20150101733A (en) | 2014-02-27 | 2014-02-27 | Hot-rolled steel sheet and method of manufacturing the same |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020140023377A KR20150101733A (en) | 2014-02-27 | 2014-02-27 | Hot-rolled steel sheet and method of manufacturing the same |
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| KR20150101733A true KR20150101733A (en) | 2015-09-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881091A (en) * | 2019-02-21 | 2019-06-14 | 江苏沙钢集团有限公司 | A kind of high-strength weathering steel strip and its production method |
| CN115109990A (en) * | 2021-03-17 | 2022-09-27 | 宝山钢铁股份有限公司 | High-strength hot-rolled weather-resistant steel plate and manufacturing method thereof |
-
2014
- 2014-02-27 KR KR1020140023377A patent/KR20150101733A/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881091A (en) * | 2019-02-21 | 2019-06-14 | 江苏沙钢集团有限公司 | A kind of high-strength weathering steel strip and its production method |
| WO2020169075A1 (en) * | 2019-02-21 | 2020-08-27 | 江苏沙钢集团有限公司 | High-strength weather-proof thin steel strip and production method therefor |
| CN115109990A (en) * | 2021-03-17 | 2022-09-27 | 宝山钢铁股份有限公司 | High-strength hot-rolled weather-resistant steel plate and manufacturing method thereof |
| CN115109990B (en) * | 2021-03-17 | 2023-11-14 | 宝山钢铁股份有限公司 | High-strength hot-rolled weather-resistant steel plate and manufacturing method thereof |
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