CN109604338A - A kind of manufacturing method reducing hot rolling pipe line steel edge hairline defect width - Google Patents
A kind of manufacturing method reducing hot rolling pipe line steel edge hairline defect width Download PDFInfo
- Publication number
- CN109604338A CN109604338A CN201811542049.4A CN201811542049A CN109604338A CN 109604338 A CN109604338 A CN 109604338A CN 201811542049 A CN201811542049 A CN 201811542049A CN 109604338 A CN109604338 A CN 109604338A
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- Prior art keywords
- continuous casting
- casting billet
- pipe line
- hot rolling
- width
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Classifications
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- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Abstract
The invention discloses a kind of manufacturing methods for reducing hot rolling pipe line steel edge hairline defect width, comprising the following steps: uses shape for the continuous casting billet of obtuse shape；Continuous casting billet is heated to target heating temperature；Continuous casting billet is come out of the stove de-scaling；Fixed width side pressure is carried out to continuous casting billet；Continuous casting billet multi-pass roughing, out button cover heat preservation after roughing；Continuous casting billet finish rolling；Continuous casting billet is cooled down to target cooling temperature；The strip for having manufactured completion is rolled into coil of strip.The invention has the benefit that being significantly reduced the width of hot rolling pipe line steel edge hairline, product quality problem caused by edge hairline can be eliminated substantially, improve downstream user lumber recovery and production efficiency.
Description
Technical field
The invention belongs to hot rolling pipeline steel product technical field of surface, and in particular to a kind of reduction hot rolling pipe line steel side
The manufacturing method of portion's hairline defect width.
Background technique
Hot rolling pipeline roll of steel plate is widely used in petroleum, natural gas transportation, is the foundation engineering of national energy artery, generally with
The delivery of hot rolling reel, downstream user carry out the hot rolling pipeline that tubulation uses common process to produce at present using spiral submerged arc welded mode
Steel edge hairline is generally wider (10~25mm), will cause and increases resection in downstream user use process or not can be removed, one
Aspect increases client and uses difficulty, reduces lumber recovery, increases cost；On the other hand may because caused by hairline defect product quality ask
It inscribes and sentences useless, or even cause the serious accidents such as pipe explosion.Therefore, reduce hairline width for improve product lumber recovery,
Product quality ensures that product service safety is of great significance.
Producing cause industry about hairline has been reached common understanding substantially, it is believed that mainly in the operation of rolling strip seamed edge due to
Two-Dimensional Heat causes the spot temperature lower, and plasticity is poor, thickness direction it is metal rolled during part down tilt to surface of steel plate
Produced, schematic diagram is as shown in Figure 1.Therefore reduce hot-strip edge hairline width mainly to start in terms of two: 1) subtracting
Overall compression ratio of the small slab to finished product；2) improve the big feature of belt steel rolling process edge temperature drop, promote slab thickness direction
Metal more flows to rolling direction.
Through retrieving, before the present patent application, application publication number is that CN 107096795A Chinese patent discloses a kind of reduction
The manufacturing method of edge defects of hot rolled strip steel.It only passes through the side for changing optimization roughing sharing of load and reducing edger roll cooling water
Method reduces edge temperature drop and reduces edge fault, from the point of view of its implementation result: the edge fault amount of changing the original sentence to only reduces by 60%, and
The not degree that specifically quantization defect reduces, it is difficult to the purpose of effectively control edge hairline defect be not achieved.Separately have, Shen Qing Publication
Number for CN 106734370A Chinese patent disclose it is a kind of prevent wide specification steel plate edge from generating the method folded, be directed to
The steel plate than (finished width/slab width) >=1.5 is spreaded in Plate rolling take carry out chamfering mode with liquefaction gas spray gun
It is cleared up, one side this method is only applicable to wide plate production (hot-strip spreads ratio≤1.0), on the other hand using artificial clear
It manages, not only low efficiency, high labor cost, and working environment is severe.
Summary of the invention
It is an object of the present invention to which in view of the deficiencies of the prior art, providing one kind can control hairline width less than 5mm
The method of reduction hot rolling pipe line steel edge hairline defect width in range.
The technical solution adopted by the present invention are as follows: a kind of manufacturing method for reducing hot rolling pipe line steel edge hairline defect width,
The following steps are included:
Step 1: using shape for the continuous casting billet of obtuse shape；
Step 2: continuous casting billet is heated to target heating temperature；
The de-scaling Step 3: continuous casting billet is come out of the stove；
Step 4: carrying out fixed width side pressure to continuous casting billet；
Step 5: continuous casting billet multi-pass roughing, out button cover heat preservation after roughing；
Step 6: continuous casting billet finish rolling；
Step 7: cooling continuous casting billet is to 500~600 DEG C of target cooling temperature.
Step 8: the strip for having manufactured completion is rolled into coil of strip.
According to the above scheme, in step 1, the obtuse angle angle of continuous casting billet edge is 125~135 °.
According to the above scheme, in step 3, continuous casting billet two sides edge is blocked while continuous casting billet de-scaling.
According to the above scheme, arc constant width machine fixed width is taken, and arc constant width machine is less than the unilateral lateral pressure amount of continuous casting billet
20mm。
According to the above scheme, in step 5, the overall compression ratio of roughing is less than 70%
According to the above scheme, in step 5, using 7 passage reversible rollings, wherein discharging squama from when 1,3,5,7 passes
Water, the reduction ratio of each passage are respectively 30%, 25%, 15%, 10%, 8%, 8%, the 4% of roughing overall compression ratio.
According to the above scheme, in step 6, using 7 rack finishing mill finish rolling, wherein the loop tension of preceding 4 rack be 4~
8MPa。
According to the above scheme, in step 2, target heating temperature is 1210~1250 DEG C.
According to the above scheme, in step 7, target cooling temperature is 500~600 DEG C.
The invention has the benefit that
1) it is significantly reduced the width of the edge hairline of hot rolling pipe line steel, product matter caused by edge hairline can be eliminated substantially
Amount problem improves downstream user lumber recovery and production efficiency；
2) whole process is controlled using mechanization, does not increase human cost additionally, working environment is good, stable product quality；
3) do not change existing production technology and control method, be applicable in stable mass metaplasia and produce；
Detailed description of the invention
Fig. 1 is existing hot-strip edge hairline mechanism of production schematic diagram.
Fig. 2 is the structural schematic diagram of obtuse angle continuous casting billet in the present invention.
Fig. 3 is the schematic diagram of arc fixed-width pressure machine in the present invention.
Specific embodiment
For a better understanding of the present invention, the present invention is further described in the following with reference to the drawings and specific embodiments.
A kind of manufacturing method reducing hot rolling pipe line steel edge hairline defect width, specifically includes the following steps:
Step 1: continuous casting billet shape is changed to obtuse shape by rectangular-shaped using arc continuous casting base, obtuse angle angle is
125~135 °, as shown in Figure 2；Guarantee that the width of continuous casting billet is more than strip finished width 50mm simultaneously；
Step 2: continuous casting billet is heated to target heating temperature using walking beam heating furnace, which is 1210~
1250℃；
Step 3: continuous casting billet goes out heating furnace de-scaling, de-scaling while, blocks continuous casting billet two sides edge；
Step 4: carrying out fixed width side pressure (specific: this time H >=h) to continuous casting billet using arc fixed-width pressure machine, while single
Side lateral pressure amount≤20mm, as shown in Figure 3；
Step 5: continuous casting billet multi-pass roughing: roughing uses multi-pass reversible rolling；The present embodiment uses 7 passes,
Wherein discharge squama water, roughing overall compression ratio≤70% when 1,3,5,7 passes from；The reduction ratio of each passage is respectively that roughing is total
30%, 25%, 15%, 10%, 8%, 8%, the 4% of compression ratio.Button cover heat preservation is carried out with roller-way insulation cover immediately after roughing out；
Step 6: continuous casting billet finish rolling: continuous casting billet enters the finish rolling of multi-frame finishing mill after cutting off tongue, uses in the present embodiment
7 rack finishing mill F1~F7, wherein the loop tension F of preceding 4 rack is 4~8MPa；
Step 7: cooling: finish rolling terminates to carry out continuous casting billet being cooled to target temperature using laminar cooling system, the temperature
It is 500~600 DEG C.
Step 8: the strip for having manufactured completion is rolled into coil of strip using coiling machine.
The operation principle of the present invention is that:
1) by the shape of continuous casting billet by it is traditional it is rectangular-shaped be changed to obtuse shape, can obviously slow down edge in the operation of rolling
The speed of heat dissipation reduces and unevenly forms wider turn over spread because deforming caused by edge surface temperature is low, plasticity is poor, after
And reduce hairline width；Meanwhile the edge thickness of original slab is reduced using obtuse angle continuous casting billet, overall compression ratio is reduced,
The degree of the metal down tilt in plate thickness direction to upper surface of steel plate will be substantially reduced；
2) since to belong to Two-Dimensional Heat area cooling rate fast at seamed edge position after slab is come out of the stove, therefore edge is hidden during de-scaling
Gear can effectively reduce edge temperature drop speed, reduce steel edge portion hairline width；
3) right angle constant width machine is replaced with arc constant width machine, the chamfering function of arc mould is mainly utilized, by obtuse angle continuous casting billet
Seamed edge position be further pressed into arc-shaped, reduce the radiating rate of the subsequent operation of rolling, improve edge temperature；Meanwhile
Fixed width lateral pressure amount≤20mm is limited, if lateral pressure amount is excessive, it will cause edge metal bump is higher, causes thickness before slab rolling
Increase, the degree of turn over spread will be further exacerbated by, and strip hairline width is caused to increase；
4) go out to roll rear insulating roller way button cover, alleviate the edge temperature drop in steel billet walking process；
5) roughing uses multi-pass, and the metal for being conducive to plate thickness direction more flows to rolling direction；By roughing total compression
Than controlling 70% hereinafter, avoiding rough rolling step edge temperature drop big, the metal in slab thickness direction exists if overall compression ratio is excessive
It is easier to extend to width direction in the operation of rolling, forms turn over spread and finished product hairline width is caused to increase；Simultaneously by roughing
Pressure distribution is adjusted to high temperature section, and the temperature difference for being primarily due to the high edge of temperature and center portion is smaller, it is easier to promote metal to
Rolling direction flowing.It in 58-60mm is to retain as far as possible by more thickness directions by the thickness design of base among roughing
Metal is left to finish rolling compression.
6) suitably increase finishing mill before several racks loop tension, when using rolling with (stock) tension, the metal of thickness direction
Tension stress effect, reduces along rolling to flow resistance, to reduce the amount of turn over spread.
Examples 1 to 10 uses different continuous casting billets, is utilized respectively two methods and (utilizes classical production process manufacture and this hair
The bright manufacturing method) manufacture strip, and to the quality of both strips.The parameter of continuous casting billet is as shown in table 1 in each embodiment；
Main technologic parameters in each embodiment are as shown in table 2.
Continuous casting billet and finished product situation in each embodiment of table 1
| Embodiment | Continuous casting billet width/mm | Thickness of strand/mm | Continuous casting billet shape | Finished width/mm |
| 1 | 1250 | 230 | Obtuse angle | 1200 |
| 2 | 1300 | 230 | Obtuse angle | 1250 |
| 3 | 1400 | 230 | Obtuse angle | 1350 |
| 4 | 1650 | 230 | Obtuse angle | 1600 |
| 5 | 1600 | 230 | Obtuse angle | 1550 |
| 6 | 1800 | 230 | Obtuse angle | 1750 |
| 7 | 1350 | 230 | Obtuse angle | 1300 |
| 8 | 1500 | 230 | Obtuse angle | 1450 |
| 9 | 1600 | 230 | Obtuse angle | 1550 |
| 10 | 1400 | 230 | Obtuse angle | 1350 |
The main technologic parameters of each embodiment of table 2
The implementation result of each embodiment of table 3.
| Embodiment | Before implementation-hairline width/mm | After implementation-hairline width/mm |
| 1 | 15 | 3 |
| 2 | 16 | 3 |
| 3 | 12 | 2 |
| 4 | 13 | 1 |
| 5 | 10 | 0 |
| 6 | 15 | 2 |
| 7 | 18.5 | 3.5 |
| 8 | 19 | 4 |
| 9 | 18 | 4 |
| 10 | 20 | 5 |
Each embodiment is as shown in table 3 using conventional method and manufacturing method of the present invention acquisition its hairline width of strip.
It can be obtained from table 3, using manufacturing method of the present invention, hot rolling pipeline steel strip steel edge hairline width is greatly reduced, and quality is different
View rate be down to 0% as original 9% (Wuhan Iron and Steel Plant in 2017 once occurred because pipe line steel edge hairline it is wide caused by quality objection, should
Objection rate is 9.01%.The quality problems of the cause problem do not occur after implementing within 2018).The reduction heat that the present invention uses in fact
The method for rolling strip width is suitable for all hot-strips, it is not limited to cited product in embodiment.
Finally it should be noted that these are only the preferred embodiment of the present invention, it is not intended to restrict the invention, although
Referring to embodiment, invention is explained in detail, for those skilled in the art, still can be to aforementioned
Technical solution documented by each embodiment is modified or equivalent replacement of some of the technical features, but it is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (9)
1. a kind of manufacturing method for reducing hot rolling pipe line steel edge hairline defect width, which comprises the following steps:
Step 1: using shape for the continuous casting billet of obtuse shape；
Step 2: continuous casting billet is heated to target heating temperature；
The de-scaling Step 3: continuous casting billet is come out of the stove；
Step 4: carrying out fixed width side pressure to continuous casting billet；
Step 5: continuous casting billet multi-pass roughing, out button cover heat preservation after roughing；
Step 6: continuous casting billet finish rolling；
Step 7: cooling continuous casting billet is to 500~600 DEG C of target cooling temperature.
Step 8: the strip for having manufactured completion is rolled into coil of strip.
2. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 1, the obtuse angle angle of continuous casting billet edge is 125~135 °.
3. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 3, continuous casting billet two sides edge is blocked while continuous casting billet de-scaling.
4. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, it is characterised in that adopt
Arc constant width machine fixed width is taken, and arc constant width machine is less than 20mm to the unilateral lateral pressure amount of continuous casting billet.
5. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 5, the overall compression ratio of roughing is less than 70%.
6. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 5, using 7 passage reversible rollings, wherein discharge squama water when 1,3,5,7 passes from, the reduction ratio difference of each passage
It is 30%, 25%, 15%, 10%, 8%, 8%, the 4% of roughing overall compression ratio.
7. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 6, using 7 rack finishing mill finish rolling, wherein the loop tension of preceding 4 rack is 4~8MPa.
8. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 2, target heating temperature is 1210~1250 DEG C.
9. reducing the manufacturing method of hot rolling pipe line steel edge hairline defect width as described in claim 1, which is characterized in that
In step 7, target cooling temperature is 500~600 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811542049.4A CN109604338B (en) | 2018-12-17 | 2018-12-17 | Manufacturing method for reducing width of hairline defect at edge of hot-rolled pipeline steel |
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| CN201811542049.4A CN109604338B (en) | 2018-12-17 | 2018-12-17 | Manufacturing method for reducing width of hairline defect at edge of hot-rolled pipeline steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111633026A (en) * | 2020-05-21 | 2020-09-08 | 武汉钢铁有限公司 | Control method for reducing linear defects at edge of hot-rolled medium-high carbon alloy steel |
| CN111889510A (en) * | 2020-06-29 | 2020-11-06 | 山西太钢不锈钢股份有限公司 | Stainless steel strip production method for reducing side turn line width of hot rolled steel strip |
| CN112474801A (en) * | 2020-11-09 | 2021-03-12 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112496034A (en) * | 2020-11-30 | 2021-03-16 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
| CN112958625A (en) * | 2021-01-28 | 2021-06-15 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy ultra-wide plate |
| CN114669608A (en) * | 2022-03-31 | 2022-06-28 | 湖南华菱涟钢特种新材料有限公司 | Control method for defects of hot-rolled medium-high carbon steel coil edge |
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| CN103484643A (en) * | 2013-08-23 | 2014-01-01 | 安阳钢铁股份有限公司 | Method for preventing hot rolling edge fractures in oriented silicon steel |
| CN103831412A (en) * | 2014-02-26 | 2014-06-04 | 钢铁研究总院 | Production method for controlling straight crack defect of surface edge of medium-thick plate |
| CN207479193U (en) * | 2017-11-03 | 2018-06-12 | 南京净环热冶金工程有限公司 | A kind of constructional device of continuous casting blank temperature the Uniform Control |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111633026A (en) * | 2020-05-21 | 2020-09-08 | 武汉钢铁有限公司 | Control method for reducing linear defects at edge of hot-rolled medium-high carbon alloy steel |
| CN111889510A (en) * | 2020-06-29 | 2020-11-06 | 山西太钢不锈钢股份有限公司 | Stainless steel strip production method for reducing side turn line width of hot rolled steel strip |
| CN112474801A (en) * | 2020-11-09 | 2021-03-12 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112474801B (en) * | 2020-11-09 | 2022-05-17 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112496034A (en) * | 2020-11-30 | 2021-03-16 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
| CN112496034B (en) * | 2020-11-30 | 2022-03-22 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
| CN112958625A (en) * | 2021-01-28 | 2021-06-15 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy ultra-wide plate |
| CN112958625B (en) * | 2021-01-28 | 2023-02-21 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy ultra-wide plate |
| CN114669608A (en) * | 2022-03-31 | 2022-06-28 | 湖南华菱涟钢特种新材料有限公司 | Control method for defects of hot-rolled medium-high carbon steel coil edge |
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