CN106048181B - A kind of low temperature think gauge pipe line steel preparation method suitable for hot continuous rolling producing line - Google Patents
A kind of low temperature think gauge pipe line steel preparation method suitable for hot continuous rolling producing line Download PDFInfo
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- CN106048181B CN106048181B CN201610600025.4A CN201610600025A CN106048181B CN 106048181 B CN106048181 B CN 106048181B CN 201610600025 A CN201610600025 A CN 201610600025A CN 106048181 B CN106048181 B CN 106048181B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention belongs to pipe line steel preparation method technical fields, disclose a kind of low temperature think gauge pipe line steel preparation method suitable for hot continuous rolling producing line, include the following steps：By with a thickness of the heating of the continuous casting billet of 230~250mm, at 1210~1250 DEG C, the strip upper and lower surface temperature difference is controlled within 30 DEG C for temperature control, and the high temperature section time controls by 70min is greater than, and the time in furnace, which presses, is greater than 170min control；Roughing is carried out to the continuous casting billet after heating, tapping temperature is 1010~1030 DEG C；Finish rolling is carried out to the continuous casting billet after roughing, mill speed 1.6~2.2m/s of range accelerates control using perseverance；Using ultrafast cold carry out one-step cooling, cooling velocity is controlled in 50~100 DEG C/s, and two sections are air-cooled to coiling temperature；Batch pipe line steel.It is at low cost the present invention provides a kind of inexpensive pipe line steel production method based on Mn-Nb-Cr system chemical component, while quality is reliable and stable.
Description
Technical field
The present invention relates to pipe line steel preparation method technical field, in particular to a kind of low temperature suitable for hot continuous rolling producing line is thick
Specification pipe line steel preparation method.
Background technique
The typical organization of high-grade pipe line steel is acicular ferrite, in order to obtain this tissue, is using conventional hot continuous rolling machine
Generally using elements such as Mo, the Ni being added to costly when cooling system.
In the prior art, using ultrafast cold big cooling rate, Cr etc. is can be used in control ultralow temperature coiling temperature feature that can be stable
More cheap alloying element similarly obtains identical tissue.But due in the prior art, lacking matched preparation side
Method causes preparation efficiency low, unstable quality.
Summary of the invention
The present invention provides a kind of low temperature think gauge pipe line steel preparation method suitable for hot continuous rolling producing line, solves existing skill
The technical issues of inexpensive high-grade pipe line steel preparation process mismatches in art, inefficiency, unstable quality.
In order to solve the above technical problems, the present invention provides a kind of low temperature think gauge pipe line steels suitable for hot continuous rolling producing line
Preparation method includes the following steps：
Will be with a thickness of the heating of the continuous casting billet of 230~250mm, temperature control is at 1210~1250 DEG C, strip upper and lower surface temperature
Within 30 DEG C, the high temperature section time controls by 70min is greater than for difference control, and the time in furnace, which presses, is greater than 170min control；
Roughing is carried out to the continuous casting billet after heating, tapping temperature is 1010~1030 DEG C；
Finish rolling is carried out to the continuous casting billet after roughing, mill speed 1.6~2.2m/s of range accelerates control using perseverance；
Using ultrafast cold carry out one-step cooling, cooling velocity is controlled in 50~100 DEG C/s, and two sections are air-cooled to coiling temperature；
Batch pipe line steel.
Further, the method also includes：
In carrying out rough rolling process, by adjusting roughing mill speed, the complete temperature of roughing is adjusted.
Further, described by adjusting roughing mill speed, adjusting the complete temperature of roughing includes：
When needing to reduce the temperature of roughing slab, roughing speed is reduced；
When needing to be promoted the temperature of roughing slab, roughing speed is promoted.
Further, in finishing stands, plate thickness is greater than 12mm.
Further, the method also includes：
Between roughing and finish-rolling process, by adjusting water between rack, slab finish rolling charging temperature is adjusted.
Further, the method also includes：
When producing pipe line steel of the plate thickness greater than 14mm, using the method for illusory 6th rack F6, reduce under Strip steel head end
It sticks up.
Further, in finishing stands, the permanent acceleration is 0.002~0.01m/s2。
Further, the method also includes plate rolling side guide control methods；
The plate rolling side guide control method includes：
In process of production, plate rolling side guide puts position in advance and increases 10mm on the basis of setting value.
Further, the plate rolling side guide control method further includes：
In taking-up activities, after metal detector triggering, 4.5 meters of rear side guide plates of strip traveling keep holding action 20mm；
After coiler pinch-roll meets relay triggering, flipper guide keeps holding action 25mm.
Further, the method also includes：Batch pressing roller control method；
The pressing roller control method of batching includes：
2#When pinch roller load is connected, 1#Pressing roller decline；
When pipe line steel end leaves 1#When metal detector HMD, 1#Pressing roller rises.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages：
Low temperature think gauge pipe line steel preparation method provided by the embodiments of the present application suitable for hot continuous rolling producing line, provides one
Kind based on Mn-Nb-Cr system chemical component, using the cooling technique of the big cooling rate of low temperature, and be equipped with corresponding heating, roughing,
Thickness >=12mm, the method for the above pipe line steel of X65 rank are produced in finish rolling, coiling technique；To realize low cost, high-quality
High standard pipe line steel.
Detailed description of the invention
Fig. 1 is the low temperature think gauge pipe line steel preparation method process provided in an embodiment of the present invention suitable for hot continuous rolling producing line
Figure.
Specific embodiment
The embodiment of the present application is solved by providing a kind of low temperature think gauge pipe line steel preparation method suitable for hot continuous rolling producing line
The technical issues of inexpensive high-grade pipe line steel preparation process in the prior art that determined mismatches, inefficiency, unstable quality；
The inexpensive production efficiency of pipe line steel of promotion and the technical effect of quality are reached.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
It states technical solution to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application skill
The detailed description of art scheme, rather than the restriction to technical scheme, in the absence of conflict, the embodiment of the present application
And the technical characteristic in embodiment can be combined with each other.
Referring to Fig. 1, a kind of low temperature think gauge pipe line steel preparation suitable for hot continuous rolling producing line provided in an embodiment of the present invention
Method includes the following steps：
Will be with a thickness of the heating of the continuous casting billet of 230~250mm, temperature control is at 1210~1250 DEG C, strip upper and lower surface temperature
Within 30 DEG C, the high temperature section time controls by 70min is greater than for difference control, and the time in furnace, which presses, is greater than 170min control；
Roughing is carried out to the continuous casting billet after heating, tapping temperature is 1010~1030 DEG C；
Finish rolling is carried out to the continuous casting billet after roughing, mill speed 1.6~2.2m/s of range accelerates control using perseverance；
Using ultrafast cold carry out one-step cooling, cooling velocity is controlled in 50~100 DEG C/s, and two sections are air-cooled to coiling temperature；
Batch pipe line steel.
Further, the method also includes：In carrying out rough rolling process, by adjusting roughing mill speed, adjustment is thick
Roll temperature.
Specifically, described by adjusting roughing mill speed, adjusting the complete temperature of roughing includes：It is cast when needing to reduce roughing
When the temperature of base, roughing speed is reduced；When needing to be promoted the temperature of roughing slab, roughing speed is promoted.
Specifically, plate thickness is greater than the high standard pipe line steel of 12mm the present embodiment provides in finishing stands.
In order to guarantee the efficiency of finish rolling, targetedly, the method also includes：Between roughing and finish-rolling process, pass through
Water between adjustment rack, adjusts slab finish rolling charging temperature.
Specifically, in the preparation of high standard pipe line steel, the method also includes：
When producing pipe line steel of the plate thickness greater than 14mm, using the method for illusory 6th rack F6, reduce under Strip steel head end
It sticks up.
Further, in finishing stands, the permanent acceleration is 0.002~0.01m/s2。
In order to guarantee the quality of coiling process, the method also includes plate rolling side guide control methods；
The plate rolling side guide control method includes：In process of production, plate rolling side guide puts position in the base of setting value in advance
Increase 10mm on plinth.
Further, the plate rolling side guide control method further includes：In taking-up activities, after metal detector triggering, band
4.5 meters of rear side guide plates of steel traveling keep holding action 20mm；After coiler pinch-roll meets relay triggering, flipper guide retaining clip
Hold movement 25mm.So that the operation batched, reliable and stable.
Further, the method also includes：Batch pressing roller control method；It is described to batch pressing roller control method packet
It includes：2#When pinch roller load is connected, 1#Pressing roller decline；When pipe line steel end leaves 1#When metal detector HMD, 1#Pressing roller
Rise.
Logical specific embodiment is introduced into the present invention below.
Embodiment 1：
By with a thickness of the heating of the continuous casting billet of 230mm, 1220 DEG C of heating temperature, high temperature section time 70min are controlled, tapping temperature
1230 DEG C, continuous casting billet each component is by weight percentage：C:0.07%, Si:0.25%, Mn:1.42%, Cr:0.2%, Nb：
0.064%, surplus is Fe and inevitable impurity.
Continuous casting billet is rolled, controls 1230 DEG C of tapping temperature, finish rolling bites 1070 DEG C of temperature, and 810 DEG C of finishing temperature,
Mill speed 2.0m/s, acceleration 0.005m/s2。
Cooling control is carried out after hot rolling, first through ultra-rapid cooling section, using air-cooled, coiling temperature is 450 degree.
Batching structure of steel is acicular ferrite, yield strength RT0.5It is 612MPa, Qu Qiang for 530MPa, tensile strength Rm
Than being 0.87, percentage of total elongation of having no progeny is 40%.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages：
Low temperature think gauge pipe line steel preparation method provided by the embodiments of the present application suitable for hot continuous rolling producing line, provides one
Kind based on Mn-Nb-Cr system chemical component, using the cooling technique of the big cooling rate of low temperature, and be equipped with corresponding heating, roughing,
Thickness >=12mm, the method for the above pipe line steel of X65 rank are produced in finish rolling, coiling technique；To realize low cost, high-quality
High standard pipe line steel.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (9)
1. a kind of low temperature think gauge pipe line steel preparation method suitable for hot continuous rolling producing line, which is characterized in that include the following steps：
By with a thickness of the heating of the continuous casting billet of 230mm, 1220 DEG C of heating temperature, high temperature section time 70min are controlled, tapping temperature 1230
℃；
Continuous casting billet is rolled, controls 1230 DEG C of tapping temperature, finish rolling bites 1070 DEG C of temperature, 810 DEG C of finishing temperature, rolls
Speed 2.0m/s, acceleration 0.005m/s2；
Cooling control is carried out after hot rolling, uses ultrafast cold carry out one-step cooling first, then using air-cooled progress two-step cooling to volume
Take temperature, wherein coiling temperature is 450 degree, and the ultrafast cold cooling velocity is controlled in 50~100 DEG C/s；
Batching structure of steel is acicular ferrite, yield strength RT0.5For 530MPa, tensile strength Rm is 612MPa, and yield tensile ratio is
0.87, percentage of total elongation of having no progeny is 40%；
Wherein, continuous casting billet each component is by weight percentage：C:0.07%, Si:0.25%, Mn:1.42%, Cr:0.2%, Nb：
0.064%, surplus is Fe and inevitable impurity.
2. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as described in claim 1, which is characterized in that
The method also includes：
In carrying out rough rolling process, by adjusting roughing mill speed, the complete temperature of roughing is adjusted.
3. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as claimed in claim 2, which is characterized in that
It is described by adjusting roughing mill speed, adjusting the complete temperature of roughing includes：
When needing to reduce the temperature of roughing slab, roughing speed is reduced；
When needing to be promoted the temperature of roughing slab, roughing speed is promoted.
4. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as claimed in claim 3, it is characterised in that：
In finishing stands, plate thickness is greater than 12mm.
5. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as claimed in claim 4, which is characterized in that
The method also includes：
Between roughing and finish-rolling process, by adjusting water between rack, slab finish rolling charging temperature is adjusted.
6. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as claimed in claim 4, which is characterized in that
The method also includes：
When producing pipe line steel of the plate thickness greater than 14mm, using the method for illusory 6th rack F6, reduces Strip steel head end and have a downwarp.
7. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as described in claim 1, which is characterized in that
The method also includes plate rolling side guide control methods；
The plate rolling side guide control method includes：
In process of production, plate rolling side guide puts position in advance and increases 10mm on the basis of setting value.
8. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as claimed in claim 7, which is characterized in that
The plate rolling side guide control method further includes：
In taking-up activities, after metal detector triggering, 4.5 meters of rear side guide plates of strip traveling keep holding action 20mm；
After coiler pinch-roll meets relay triggering, flipper guide keeps holding action 25mm.
9. being suitable for the low temperature think gauge pipe line steel preparation method of hot continuous rolling producing line as claimed in claim 8, which is characterized in that
The method also includes：Batch pressing roller control method；
The pressing roller control method of batching includes：
2#When pinch roller load is connected, 1#Pressing roller decline；
When pipe line steel end leaves 1#When metal detector HMD, 1#Pressing roller rises.
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| CN109402354A (en) * | 2018-11-30 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | It is a kind of it is efficient produce have superior low temperature block hammer performance think gauge X70M pipeline hot rolled strip preparation method |
| CN109628854B (en) * | 2019-01-17 | 2021-01-29 | 河北敬业中厚板有限公司 | Method for producing steel plate by ultra-fast cooling process |
| CN110479762B (en) * | 2019-08-15 | 2020-10-30 | 武汉钢铁有限公司 | Hot-rolled strip steel full-continuous production device and method for ferrite rolling |
| CN111286672B (en) * | 2020-03-25 | 2022-03-29 | 江苏省沙钢钢铁研究院有限公司 | Needle-shaped ferrite type X60-grade HIC-resistant pipeline steel and rolling method thereof |
| CN112058910A (en) * | 2020-08-31 | 2020-12-11 | 日照钢铁控股集团有限公司 | Production method for improving rolling stability of thick pipeline steel |
| CN112207138B (en) * | 2020-09-25 | 2022-08-05 | 攀钢集团西昌钢钒有限公司 | Method for stably controlling finish rolling temperature of high-grade pipeline steel |
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| CN102653836B (en) * | 2012-05-04 | 2014-05-28 | 湖南华菱涟源钢铁有限公司 | Manufacturing method of X70 pipeline steel hot rolled steel roll |
| CN103243278B (en) * | 2013-05-10 | 2015-05-13 | 武汉钢铁(集团)公司 | X90 pipeline steel and production method thereof |
| CN103233185B (en) * | 2013-05-10 | 2015-10-14 | 武汉钢铁(集团)公司 | A kind of X100 pipeline steel and production method thereof |
| CN103276315B (en) * | 2013-05-17 | 2015-05-20 | 武汉钢铁(集团)公司 | 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof |
| CN103572025B (en) * | 2013-11-19 | 2015-06-17 | 攀钢集团西昌钢钒有限公司 | Production method of low-cost X52 pipeline steel and pipeline steel |
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