CN106350735B - Think gauge Q450NQR1 steel plates and its roughing method - Google Patents
Think gauge Q450NQR1 steel plates and its roughing method Download PDFInfo
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- CN106350735B CN106350735B CN201611007328.1A CN201611007328A CN106350735B CN 106350735 B CN106350735 B CN 106350735B CN 201611007328 A CN201611007328 A CN 201611007328A CN 106350735 B CN106350735 B CN 106350735B
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to weathering steel and its milling method, and in particular to the present invention relates to think gauge Q450NQR1 steel plates and its roughing method, belongs to steel technical field.The roughing method of think gauge Q450NQR1 steel plates, chemical component weight percentage are C：0.05~0.08%, Si：0.25~0.40%, Mn：0.8~1.45%, P：≤ 0.018%, S：≤ 0.008%, Cr：0.32~0.38%, Ni：0.12~0.20, Cu：0.20~0.25%, V：0.05~0.06%, Nb：0.03~0.045%, remaining is Fe and inevitable impurity；Wherein, the roughing method is using the whole total de-scaling of odd even passage, odd even passage de-scaling water standard-sized sheet, low speed rolling.The present invention, which solves cooling procedure, can not eliminate the uneven problem of original grain, and cost is low.
Description
Technical field
The present invention relates to weathering steel and its milling method, and in particular to think gauge Q450NQR1 steel plates and its roughing method,
Belong to steel technical field.
Background technology
Microscopic structure is that the uneven microstructure of surface and center portion often results in an important factor for determining hot continuous rolling steel products
The poor mechanical property fluctuation of product is big.Particularly in low-temperature impact test, uneven microscopic structure size often causes
The difference of ductile-brittle transition temperature, so as to cause the poor impact toughness of material or impact flexibility to fluctuate greatly.
Due to deforming the limitation of rule itself in course of hot rolling, in the case where deflection is certain, the strain rate on top layer begins
It is greater than center portion eventually, so as to cause the original austenite grains degree difference on surface and center portion, ultimately results in surface and the heart of material
The structure property difference in portion.Want to improve surface and the uniformity of core structure performance, optimal thinking is to reduce surface and the heart
The strain rate difference in portion.
CN102199697A discloses a kind of method for improving high-strength engineering machines steel low-temperature impact toughness.Its technique control
The emphasis of system is：Using Process of Hot Transfering And Hot Charging, hot charging temperature is 500~600 DEG C；The degree of superheat of casting is 18~20 DEG C, pulling rate control
System is in 1.2~1.4m/min.Using two frame roughing and six frame finish rolling, roughing uses six passes, and austenite is not tied again
Crystalline region drafts 65~70%.Using leading portion refrigerating mode, cooling velocity brings up to 10~15 DEG C/s.By increasing refined crystalline strengthening
Improve low-temperature impact toughness.
CN104525588A discloses a kind of thick steel plates course of hot rolling that improves and deforms infiltrative method.Its technique is
Close to setting evenly and rapidly cooling device at heavy and medium plate mill or tropical roughing mill mouth, its length is 5~15m, cooling water
3000~6000m3/h of total amount；The asymmetrical uniformly quick cooling of upper and lower surface, the temperature ladder of acquisition are carried out to slab before rolling
Spend for 2~3 DEG C/mm, and return it is red before rapidly enter milling train and carry out differential temperature rolling, improve the deformation of slab center portion.
In summary, in the production process of cut deal, technical staff is more to set about from cooling technique, carries out structure property control
System, but the control of the cooldown rate of surface and center portion is very difficult when slab thickness is larger.Moreover, rough rolling process causes
Surface and the original grain degree difference of center portion can not possibly be completely eliminated.In addition, also have by adding equipment to obtain table
Face carries out differential temperature rolling with center portion temperature difference, or adds the stronger milling train of ability by improving workpiece thickness, and then improves thick
Roll the process of deformation total amount.But add equipment and restricted by cost control and field condition.Therefore, the invention provides
A kind of inexpensive, simple to operation roughing method, by the control of roughing de-scaling water, the temperature of raising surface and center portion
Difference, materials microstructure uniformity is improved by differential temperature rolling mill practice and improves material property.
The content of the invention
First technical problem to be solved by this invention is to provide a kind of roughing method of think gauge Q450NQR1 steel plates,
This method can improve materials microstructure uniformity.
In order to solve the above technical problems, technical scheme is as follows：
The roughing method of the think gauge Q450NQR1 steel plates of the present invention, chemical component weight percentage is C：0.05~
0.08%, Si：0.25~0.40%, Mn：0.80~1.45%, P：≤ 0.018%, S：≤ 0.008%, Cr：0.32~
0.38%, Ni：0.12~0.20%, Cu：0.20~0.25%, V：0.05~0.06%, Nb：0.03~0.045% remaining be
Fe and inevitable impurity, are produced using hot continuous rolling production line；
Wherein, the roughing method is rolled using the whole total de-scaling of odd even passage, odd even passage de-scaling water standard-sized sheet, low speed
System；
The previous three passes rolling rate reduction 3~10% of the low speed rolling, preferably previous three passes reduce by 10% respectively,
8%th, 3%.
Further, the hot continuous rolling sotck thinkness of the think gauge Q450NQR1 steel plates is 230~230mm.
Further, the thickness of the think gauge Q450NQR1 steel plates is 12~16mm, and it is thick that the roughing method does not change its
The compression ratio rolled.
Further, the roughing Preform surface temperature of the think gauge Q450NQR1 steel plates and center portion temperature difference theoretical value
30~200 DEG C.
Preferably, 10~20mm of cooling depth of the think gauge Q450NQR1 steel plates.
Preferably, the cooling depth of the think gauge Q450NQR1 steel plates is that surface temperature reaches 30 DEG C with center portion temperature difference
The distance of position.
Surface of steel plate temperature is the maximum position of area, it is preferred that surface temperature is preferred in more than Ar3, Q450NQR1 steel
900℃。
The invention solves second technical problem be to provide a kind of think gauge Q450NQR1 steel plates.The steel plate is using upper
The roughing method for stating think gauge Q450NQR1 steel plates is prepared.
The center portion deflection about 5%~11% of the think gauge Q450NQR1 steel plates, as shown in Figure 1.
Further, the think gauge Q450NQR1 steel plates, structural homogenity is improved by the above method, is obtained good
Good low temperature impact properties, surface and center portion grain size difference are reduced to less than 1 grade by original 2 grades.
Beneficial effect：
The present invention has also considered deformation heat in theoretical calculating process, material under red situation different temperatures is returned on surface
Strength problem, there is good promotional value to steel grade similar in other physical parameters, have the following advantages that：
1st, the present invention can just improve materials microstructure performance well without additionally increase equipment cost, well should have
With value；
2nd, the present invention can effectively improve the original austenite grains uniformity of slab, and original can not be eliminated by solving cooling procedure
The uneven problem of beginning crystal grain.The surface of composition steel grade is reduced within 1 grade with center portion grain size difference by two-stage, impact property by compared with
It is low and fluctuate that larger to be improved as impact property steady redundancy larger.
Brief description of the drawings
Fig. 1 slab thicknesses direction Temperature Distribution figure compared with deforming distribution；
Transverse and longitudinal be apart from slab center portion distance, the longitudinal axis be strain rate
Fig. 2 original roughing rolling mill practice Q450NQR1 tissue topographies；
Fig. 3 improves roughing rolling mill practice Q450NQR1 tissue topographies.
Embodiment
The roughing method of the think gauge Q450NQR1 steel plates of the present invention, chemical component weight percentage is C：0.05~
0.08%, Si：0.25~0.40%, Mn：0.80~1.45%, P：≤ 0.018%, S：≤ 0.008%, Cr：0.32~
0.38%, Ni：0.12~0.20%, Cu：0.20~0.25%, V：0.05~0.06%, Nb：0.03~0.045% remaining be
Fe and inevitable impurity, are produced using hot continuous rolling production line；
Wherein, the roughing method is rolled using the whole total de-scaling of odd even passage, odd even passage de-scaling water standard-sized sheet, low speed
System；
The previous three passes rolling rate reduction 3~10% of the low speed rolling, preferably previous three passes reduce by 10% respectively,
8%th, 3%.
Further, the hot continuous rolling sotck thinkness of the think gauge Q450NQR1 steel plates is 230~230mm.
Further, the thickness of the think gauge Q450NQR1 steel plates is 12~16mm, and it is thick that the roughing method does not change its
The compression ratio rolled.
Further, the roughing Preform surface temperature of the think gauge Q450NQR1 steel plates and center portion temperature difference theoretical value
30~200 DEG C.
Preferably, 10~20mm of cooling depth of the think gauge Q450NQR1 steel plates.
Preferably, the cooling depth of the think gauge Q450NQR1 steel plates is that surface temperature reaches 30 DEG C with center portion temperature difference
The distance of position.
Surface of steel plate temperature is the maximum position of area, it is preferred that surface temperature is preferred in more than Ar3, Q450NQR1 steel
900℃。
The think gauge Q450NQR1 steel plates of the present invention, are prepared into using the roughing method of above-mentioned think gauge Q450NQR1 steel plates
Arrive；
The center portion deflection about 5%~11% of the think gauge Q450NQR1 steel plates, as shown in Figure 1.
Further, the think gauge Q450NQR1 steel plates, structural homogenity is improved by the above method, is obtained good
Good low temperature impact properties, surface and center portion grain size difference are reduced to less than 1 grade by original 2 grades.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
Embodiment 1-5
Chemical composition according to table 1 smelts the Q450NQR1 steel billets of embodiment 1-5, the sotck thinkness point of embodiment 1-5
Wei not 200mm, 230mm, 230mm, 230mm, 230mm.
The steel billet chemical composition % of the embodiment 1-5 of table 1
Using the whole total de-scaling of odd even passage, rolling speed refers to table 2, does not change the compression ratio of its roughing, roughing removes
Squama water odd even passage standard-sized sheet.The surface temperature of embodiment 1-5 is respectively 910,930,930,940,920；Cooling down depth is respectively
10mm, 18mm, 16mm, 18mm, 20mm, which is calculated, must control top layer and center portion temperature difference between 30~200 DEG C.
The rolling parameter of the embodiment 1-5 of table 2
The finished product thickness of rolling embodiment 1-5 is respectively 12mm.Surface and center portion grain size are as shown in Figure 3.-
40 DEG C of impact values refer to table 4.
Comparative example 1-2
Using the technique of former strange passage de-scaling, the identical steel plate with Examples 1 and 2 is rolled respectively, wherein, comparative example 1
In triplicate, the product surface and center portion grain size obtained is as shown in Figure 2.- 40 DEG C of impact values refer to table 3.
Table 3 comparative example, 1-2-40 DEG C of impact value
Table 4 embodiment, 1-6-40 DEG C of impact value
As can be seen from Table 3, the cold impact value of former technique is low, and fluctuation range is larger, and performance is unstable.And table 4 can
To find out that the cold impact value of the present invention is high, fluctuation is small, considerably beyond standard value >=60J, is fully able to meet standard.In addition,
It is reduced to it can be seen from Fig. 2 and Fig. 3 using technical scheme, surface and center portion grain size difference by original 2 grades
Less than 1 grade.
It can be seen that can effectively improve the strain rate of slab center portion using the roughing technique of the present invention, rolled without changing other
Technological parameter processed just can effectively improve the structural homogenity and low temperature impact properties of product.
Claims (3)
1. the roughing method of think gauge Q450NQR1 steel plates, it is characterised in that the chemical component weight percentage of the steel plate is
C：0.05~0.08%, Si：0.25~0.40%, Mn：0.80~1.45%, P：≤ 0.018%, S：≤ 0.008%, Cr：0.32~
0.38%, Ni：0.12~0.20%, Cu：0.20~0.25%, V：0.05~0.06%, Nb：0.03~0.045%, remaining be Fe and
Inevitable impurity；
Wherein, the roughing method is using the whole total de-scaling of odd even passage, odd even passage de-scaling water standard-sized sheet, low speed rolling；
The previous three passes rolling speed of the low speed rolling reduces by 10%, 8%, 3% respectively；The think gauge Q450NQR1 steel plates
Hot continuous rolling sotck thinkness is 200 or 230 mm；The thickness of the think gauge Q450NQR1 steel plates is 12~16mm；The think gauge
30 DEG C of the roughing Preform surface temperature of Q450NQR1 steel plates and center portion temperature difference theoretical value；
10~20mm of cooling depth of the think gauge Q450NQR1 steel plates；
900 DEG C of the surface temperature.
2. think gauge Q450NQR1 steel plates, it is characterised in that it is prepared using the roughing method described in claim 1, it is described
The center portion deflection of think gauge Q450NQR1 steel plates improves 5%~11%.
3. think gauge Q450NQR1 steel plates according to claim 2, it is characterised in that the think gauge Q450NQR1 steel plates
Surface and center portion grain size difference are reduced to less than 1 grade.
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| CN110527810B (en) * | 2019-08-28 | 2021-09-07 | 唐山钢铁集团有限责任公司 | Method for improving core toughness of thick plate by utilizing descaling box |
| CN112453051A (en) * | 2020-09-28 | 2021-03-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for producing high-strength steel by high permeability of conventional rolling mill |
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| JP2003221640A (en) * | 2002-01-30 | 2003-08-08 | Nippon Steel Corp | Steel plate showing excellent laser cuttability and its manufacturing process |
| CN101338401A (en) * | 2008-08-29 | 2009-01-07 | 攀钢集团研究院有限公司 | High strength weathering steel and producing method thereof |
| CN101618398A (en) * | 2009-08-06 | 2010-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling internal defects of steel |
| CN102102141A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Hot rolling process for improving structural homogeneity of oriented silicon steel plate |
| CN103042055A (en) * | 2012-12-27 | 2013-04-17 | 攀钢集团西昌钢钒有限公司 | Hot-rolled billet steel rough-rolling descaling method |
| CN105734236A (en) * | 2016-03-16 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving falling performance of thick-gauge pipeline steel |
-
2016
- 2016-11-16 CN CN201611007328.1A patent/CN106350735B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003221640A (en) * | 2002-01-30 | 2003-08-08 | Nippon Steel Corp | Steel plate showing excellent laser cuttability and its manufacturing process |
| CN101338401A (en) * | 2008-08-29 | 2009-01-07 | 攀钢集团研究院有限公司 | High strength weathering steel and producing method thereof |
| CN101618398A (en) * | 2009-08-06 | 2010-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling internal defects of steel |
| CN102102141A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Hot rolling process for improving structural homogeneity of oriented silicon steel plate |
| CN103042055A (en) * | 2012-12-27 | 2013-04-17 | 攀钢集团西昌钢钒有限公司 | Hot-rolled billet steel rough-rolling descaling method |
| CN105734236A (en) * | 2016-03-16 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving falling performance of thick-gauge pipeline steel |
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Effective date of registration: 20230918 Address after: 617000 Taoyuan street, East District, Panzhihua, Sichuan Province, No. 90 Patentee after: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. Patentee after: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Address before: 617000 Taoyuan street, East District, Panzhihua, Sichuan Province, No. 90 Patentee before: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. |