CN109881083A - Strip cast-rolled 700 MPa-grade weathering steel and production method thereof - Google Patents
Strip cast-rolled 700 MPa-grade weathering steel and production method thereof Download PDFInfo
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- CN109881083A CN109881083A CN201810587493.1A CN201810587493A CN109881083A CN 109881083 A CN109881083 A CN 109881083A CN 201810587493 A CN201810587493 A CN 201810587493A CN 109881083 A CN109881083 A CN 109881083A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 229910000870 Weathering steel Inorganic materials 0.000 title abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 238000009749 continuous casting Methods 0.000 claims abstract description 34
- 238000005098 hot rolling Methods 0.000 claims abstract description 26
- 238000005266 casting Methods 0.000 claims abstract description 14
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 239000000443 aerosol Substances 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 229910000906 Bronze Inorganic materials 0.000 claims description 5
- 241001417490 Sillaginidae Species 0.000 claims description 5
- 239000010974 bronze Substances 0.000 claims description 5
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 8
- 239000010949 copper Substances 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
一种薄带连铸700MPa级耐候钢及其生产方法，该生产方法包括如下步骤：1)冶炼，钢水化学成分为：C<0.03％，Si:0.20‑0.80％，Mn<1.0％，P:0.03‑1.50％，S≤0.008％，N≤0.008％，Cu:0.40‑1.50％，Cr:0.80‑1.50％，Ni<0.10％，Nb:0.05‑0.20％，V:0.05‑0.20％，其余为Fe和不可避免杂质；2)薄带连铸，将冶炼合格的钢水经过一对相向旋转的铜铸辊连铸成厚度为1.4‑2.5mm的铸带，钢水过热度控制在80℃以下；3)铸带在线热轧，热轧压下量为15‑65％，带钢轧后温度为950‑1050℃；4)冷却及卷取，热轧带钢通过气雾冷却至300‑450℃，获得均匀细小的铁素体和少量珠光体组织。根据本发明的700MPa级耐候钢具有生产流程短、生产成本低、带钢板形好，焊接容易的特点。
A thin strip continuous casting 700MPa grade weathering steel and a production method thereof, the production method comprising the following steps: 1) smelting, the chemical composition of molten steel is: C<0.03%, Si: 0.20-0.80%, Mn<1.0%, P: 0.03‑1.50%, S≤0.008%, N≤0.008%, Cu: 0.40‑1.50%, Cr: 0.80‑1.50%, Ni<0.10%, Nb: 0.05‑0.20%, V: 0.05‑0.20%, the rest are Fe and unavoidable impurities; 2) Thin strip continuous casting, continuous casting of qualified molten steel through a pair of oppositely rotating copper casting rolls into a casting strip with a thickness of 1.4-2.5mm, and the molten steel superheat is controlled below 80 °C; 3 ) On-line hot rolling of cast strip, the hot rolling reduction is 15-65%, and the temperature after strip rolling is 950-1050 ℃; 4) Cooling and coiling, the hot-rolled strip is cooled to 300-450 ℃ by aerosol, Obtain uniform and fine ferrite and a small amount of pearlite. The 700MPa grade weathering steel according to the present invention has the characteristics of short production process, low production cost, good strip shape and easy welding.
Description
Technical field
The invention belongs to Hi-Stren steel manufacturing field, particularly a kind of low cost, short route, easily welding,
High durable, high-intensitive weathering steel strip and its production method.
Background technique
Weathering steel has characteristics and the significant advantages such as green, environmental protection, longevity, is applicable not only to a variety of weathers and environment, and
And had both the performances such as high intensity, high tenacity, solderable, fire resisting, wear-resisting, be widely used in making case tank, vehicle, building,
The all trades and professions such as bridge, pipeline, machinery.
Currently, the 700MPa grade weathering steel produced both at home and abroad, mostly uses Nb, V, Ti, Mo combined microalloying technology, lead to
Refined crystalline strengthening and precipitation strength are crossed to improve the comprehensive mechanical property of weathering steel.
Patent document CN200610030713.8 discloses a kind of manufacturing method of 700MPa grades of weathering steel, steel grade addition
At least two in Nb, Ti, Mo to improve the intensity of weathering steel.Patent document CN201010246778.2 discloses a kind of 700MPa
The production method of grade weathering steel forms precipitation strength by addition Nb, Ti microalloy element to improve the intensity of weathering steel.Patent
The B of 0.0005-0.003% is added in 700MPa disclosed in document CN200610125125.2 grades of weathering steel to improve weathering steel
Intensity.Above-mentioned three productions method is all made of traditional hot continuous rolling process production, the finger gauge of usual weathering steel produced
Lattice produce 2mm high-strength weather-proof steel product below and there is very big difficulty in 2mm or more.It is produced in traditional hot continuous rolling
In high-strength weathering steel, be frequently present of following problems: process flow is long, energy consumption is high, unit equipment is more, capital construction is at high cost, production
Overall cost is high；During slab CC machine, it is be easy to cause the segregation of the elements such as P, Cu, leads to each of slab and hot-strip
Anisotropy and macroscopic cracking etc., so that lumber recovery is low；In heating of plate blank and course of hot rolling, it be easy to cause Cu element in slab
Surface, which is in a liquid state, to be distributed and penetrates into crystal boundary, is formed hot-short crackle during the rolling process, is seriously affected the surface matter of hot-strip
Amount and cold-bending property etc.；Overall reduction is big in the hot rolling for high-strength weathering steel, and hot-rolling draught pressure is big, traditional hot continuous rolling
Machine produces high-intensitive thin gauge weathering steel, and there are bigger difficulty, and in addition the plate shape of thin gauge weathering steel is also difficult to control.
A kind of production method of 700MPa grades of weathering steels according to the present invention, using sheet-band continuous casting and rolling technique, significantly
Production procedure is shortened, production cost is reduced, reduces element segregation, avoids hot-short defect, ensure that the resistance to of weathering steel
Performance is waited, and improves the welding performance of weathering steel by the design of low C ingredient, in addition, being mentioned by Nb element solid solution strengthening mechanism
The high intensity of weathering steel, also avoids the conventional problem added V, Mo element and cause welding performance low.
Summary of the invention
The center segregation of casting blank that is easy to appear for existing 700MPa grades of weathering steel, surface quality be poor, thin gauge production
Long flow path, high production cost, production efficiency is low, the control of thin slab product plate shape difficulty, the problems such as welding performance is poor, the present invention provides
A kind of novel weathering steel and its production method, it is therefore an objective to shorten the production procedure of weathering steel, reduce production cost, improve thin rule
The production efficiency of lattice weathering steel, improves weathering steel welding performance at the plate shape for improving thin gauge strip.
To achieve the goals above, on the one hand, the invention discloses a kind of productions of thin strap continuous casting 700MPa grades of weathering steels
Method follows the steps below:
1) it smelts
Ladle chemistry are as follows: C < 0.03%, Si:0.20-0.80%, Mn < 1.0%, P:0.03-1.50%, S≤
0.008%, N≤0.008%, Cu:0.40-1.50%, Cr:0.80-1.50%, Ni < 0.10%, Nb:0.05-0.20%, V:
0.05-0.20%, remaining is Fe and inevitable impurity；
2) thin strap continuous casting
Qualified molten steel will be smelted and be casting continuously to form Cast Strip by the casting in bronze roller of a pair of of opposite direction rotating；
3) the online hot rolling in Cast Strip
By 1 passage hot rolling at Thin Strip Steel, it is 950-1050 DEG C that strip, which rolls rear temperature, for Cast Strip；
4) it cools down and batches
Hot-strip is cooled to 300-450 DEG C by aerosol, and batches coiled.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 2),
Cast Strip is with a thickness of 1.4-2.5mm.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 2),
Degree of superheat when molten steel continuous casting is controlled at 80 DEG C or less.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 3),
Drafts of the Cast Strip Jing Guo hot-rolling mill hot rolling is 15-65%.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 3),
Cast Strip is by hot rolling formation hot rolling thin strip with a thickness of 0.6-1.9mm.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 3),
The width of hot-strip is 600-1500mm.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 4),
The yield strength of Thin Strip Steel is in 700MPa or more, and tensile strength is in 780MPa or more, and elongation percentage is 18% or more.
A kind of production method of thin strap continuous casting 700MPa grades of weathering steels according to the present invention, it is preferable that in the step 4),
The microstructure of strip is uniformly tiny ferrite and a small amount of pearlite.
To achieve the goals above, on the other hand, the invention also discloses a kind of thin strap continuous casting 700MPa grades of weathering steels,
It is produced using a kind of production method of thin strap continuous casting 700MPa grades of weathering steels above-mentioned.
A kind of thin strap continuous casting 550MPa grades of weathering steel strips according to the present invention, it is preferable that the yield strength of Thin Strip Steel exists
700MPa or more, tensile strength is in 780MPa or more, and for elongation percentage 18% or more, the microstructure of strip is uniformly tiny iron
Ferritic and a small amount of pearlite.
Beneficial technical effect
Compared with prior art, the features of the present invention and beneficial effect include at least:
(1) C content in weathering steel is reduced, ensure that the surface quality of Cast Strip and hot rolling thin strip, ensure that resistance to
Wait the bending property of steel；
(2) C, Ni content in weathering steel are reduced, the welding performance of weathering steel is improved；
(3) by addition Nb, V element solution strengthening, the intensity and welding performance of weathering steel are improved；
(4) molten steel overheat when thin strap continuous casting is reduced, Cast Strip austenite grain is refined, so that weathering steel hot rolled thin strip shape
At uniform small grains, the forming property of weathering steel is improved while improving weather-proof hardness of steel；
(5) drafts for improving strip tandem rolling, ensure that the convexity and plate shape of strip；
(6) hot rolling pass for reducing traditional hot rolling and thin slab continuous casting and rolling shortens production procedure and process, drop
Low production cost.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the embodiment of the present invention, the attached drawing of embodiment will be made simply below
It introduces.It should be evident that the accompanying drawings in the following description merely relates to some embodiments of the present invention, rather than to limit of the invention
System.
Fig. 1 is the metallographic structure of 700MPa grades of weathering steel according to the present invention.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be to the embodiment of the present invention
Technical solution is clearly and completely described.Obviously, described embodiment is a part of the embodiments of the present invention, rather than
Whole embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art are without creative work
Under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical term or scientific term used in the disclosure are should be in fields of the present invention
The ordinary meaning that personage with general technical ability is understood.
Embodiment 1
The present embodiment follows the steps below:
1) it smelts
Ladle chemistry are as follows: C:0.28%, Si:0.58%, Mn:0.75%, P:0.05%, S:0.002%, N:
0.002%, Cu:0.80%, Cr:1.40%, Ni:0.07%, Nb:0.08%, V:0.05%, remaining is Fe and inevitable miscellaneous
Matter；
2) thin strap continuous casting
Qualified molten steel will be smelted and be casting continuously to form the Cast Strip with a thickness of 2.3mm, molten steel by the casting in bronze roller of a pair of of opposite direction rotating
The degree of superheat is 58 DEG C；
3) the online hot rolling in Cast Strip
Hot rolling drafts is 52%, and it is 1025 DEG C that strip, which rolls rear temperature,；
4) it cools down and batches
Hot-strip is cooled to 350 DEG C by aerosol, and batches coiled.
It is 1.1mm by the obtained weathering steel strip thickness of above step, Mechanics Performance Testing, surrender is carried out to strip
Intensity is 743MPa, tensile strength 836MPa, elongation percentage 19%.
Embodiment 2
The present embodiment follows the steps below:
1) it smelts
Ladle chemistry are as follows: C:0.17%, Si:0.66%, Mn:0.55%, P:0.06%, S:0.003%, N:
0.002%, Cu:1.20%, Cr:1.10%, Ni:0.03%, Nb:0.11%, V:0.07 remaining be Fe and inevitable impurity；
2) thin strap continuous casting
Qualified molten steel will be smelted and be casting continuously to form the Cast Strip with a thickness of 2.0mm, molten steel by the casting in bronze roller of a pair of of opposite direction rotating
The degree of superheat is 32 DEG C；
3) the online hot rolling in Cast Strip
Hot rolling drafts is 45%, and it is 1015 DEG C that strip, which rolls rear temperature,；
4) it cools down and batches
Hot-strip is cooled to 410 DEG C by aerosol, and batches coiled.
It is 1.1mm by the obtained weathering steel strip thickness of above step, Mechanics Performance Testing, surrender is carried out to strip
Intensity is 721MPa, tensile strength 796MPa, elongation percentage 23%.
Embodiment 3
The present embodiment follows the steps below:
1) it smelts
Ladle chemistry are as follows: C:0.22%, Si:0.47%, Mn:0.35%, P:0.04%, S:0.002%, N:
0.003%, Cu:0.70%, Cr:0.90%, Ni:0.05%, Nb:0.90%, V:0.18%, remaining is Fe and inevitable miscellaneous
Matter；
2) thin strap continuous casting
Qualified molten steel will be smelted and be casting continuously to form the Cast Strip with a thickness of 2.1mm, molten steel by the casting in bronze roller of a pair of of opposite direction rotating
The degree of superheat is 49 DEG C；
3) the online hot rolling in Cast Strip
Hot rolling drafts is 33%, and it is 975 DEG C that strip, which rolls rear temperature,；
4) it cools down and batches
Hot-strip is cooled to 380 DEG C by aerosol, and batches coiled.
It is 1.4mm by the obtained weathering steel strip thickness of above step, Mechanics Performance Testing, surrender is carried out to strip
Intensity is 732MPa, tensile strength 815MPa, elongation percentage 21%.
The above is only exemplary embodiment of the invention, protection scope and is not intended to limit the present invention, this hair
Bright protection scope is determined by the attached claims.
Claims (10)
1. a kind of production method of thin strap continuous casting 700MPa grades of weathering steels, includes the following steps:
1) it smelts
Ladle chemistry are as follows: C < 0.03%, Si:0.20-0.80%, Mn < 1.0%, P:0.03-1.50%, S≤0.008%,
N≤0.008%, Cu:0.40-1.50%, Cr:0.80-1.50%, Ni < 0.10%, Nb:0.05-0.20%, V:0.05-
0.20%, remaining is Fe and inevitable impurity；
2) thin strap continuous casting
Qualified molten steel will be smelted and be casting continuously to form Cast Strip by the casting in bronze roller of a pair of of opposite direction rotating；
3) the online hot rolling in Cast Strip
By 1 passage hot rolling at Thin Strip Steel, it is 950-1050 DEG C that strip, which rolls rear temperature, for Cast Strip；
4) it cools down and batches
Hot-strip is cooled to 300-450 DEG C by aerosol, and batches coiled.
2. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 2)
In, Cast Strip is with a thickness of 1.4-2.5mm.
3. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 2)
In, degree of superheat when molten steel continuous casting is controlled at 80 DEG C or less.
4. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 3)
In, drafts of the Cast Strip Jing Guo hot-rolling mill hot rolling is 15-65%.
5. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 3)
In, Cast Strip is by hot rolling formation hot rolling thin strip with a thickness of 0.6-1.9mm.
6. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 3)
In, the width of hot-strip is 600-1500mm.
7. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 4)
In, the yield strength of Thin Strip Steel is in 700MPa or more, and tensile strength is in 780MPa or more, and elongation percentage is 18% or more.
8. the production method of thin strap continuous casting 700MPa grades of weathering steels as described in claim 1, which is characterized in that the step 4)
In, the microstructure of strip is uniformly tiny ferrite and a small amount of pearlite.
9. a kind of thin strap continuous casting 700MPa grades of weathering steels, which is characterized in that using as described in any one in claim 1-8
Production method produced.
10. thin strap continuous casting 700MPa grades of weathering steels as claimed in claim 9, which is characterized in that the yield strength of Thin Strip Steel exists
700MPa or more, tensile strength is in 780MPa or more, and for elongation percentage 18% or more, the microstructure of strip is uniformly tiny iron
Ferritic and a small amount of pearlite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810587493.1A CN109881083A (en) | 2018-06-08 | 2018-06-08 | Strip cast-rolled 700 MPa-grade weathering steel and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810587493.1A CN109881083A (en) | 2018-06-08 | 2018-06-08 | Strip cast-rolled 700 MPa-grade weathering steel and production method thereof |
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| Publication Number | Publication Date |
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| CN109881083A true CN109881083A (en) | 2019-06-14 |
Family
ID=66924777
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810587493.1A Pending CN109881083A (en) | 2018-06-08 | 2018-06-08 | Strip cast-rolled 700 MPa-grade weathering steel and production method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110358976A (en) * | 2019-08-22 | 2019-10-22 | 江苏沙钢集团有限公司 | High-carbon steel thin strip and production method thereof |
| CN110983193A (en) * | 2019-12-25 | 2020-04-10 | 江苏沙钢集团有限公司 | 800 MPa-grade high-strength steel based on thin strip casting and rolling and production method thereof |
| CN111218607A (en) * | 2020-04-16 | 2020-06-02 | 江苏沙钢集团有限公司 | A kind of high-strength seat slide rail steel and its production method based on thin strip casting and rolling |
| EP4039381A1 (en) * | 2021-02-05 | 2022-08-10 | Ali Mashi | Method for reducing the thickness of a strip of metal by hot-roll-forming and system for roll-forming a strip of metal by hot-roll-forming |
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| CN110358976A (en) * | 2019-08-22 | 2019-10-22 | 江苏沙钢集团有限公司 | High-carbon steel thin strip and production method thereof |
| CN110983193A (en) * | 2019-12-25 | 2020-04-10 | 江苏沙钢集团有限公司 | 800 MPa-grade high-strength steel based on thin strip casting and rolling and production method thereof |
| CN111218607A (en) * | 2020-04-16 | 2020-06-02 | 江苏沙钢集团有限公司 | A kind of high-strength seat slide rail steel and its production method based on thin strip casting and rolling |
| EP4039381A1 (en) * | 2021-02-05 | 2022-08-10 | Ali Mashi | Method for reducing the thickness of a strip of metal by hot-roll-forming and system for roll-forming a strip of metal by hot-roll-forming |
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