CN109402354A - 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 - Google Patents
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 Download PDFInfo
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- CN109402354A CN109402354A CN201811451357.6A CN201811451357A CN109402354A CN 109402354 A CN109402354 A CN 109402354A CN 201811451357 A CN201811451357 A CN 201811451357A CN 109402354 A CN109402354 A CN 109402354A
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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
- C21D8/0226—Hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention discloses a kind of preparation method for efficiently producing and having the think gauge X70M pipeline hot rolled strip of superior low temperature block hammer performance, it include: to smelt, continuous casting, slab is handled using cold charge heating furnace, roughing, finish rolling, cool down and etc., the think gauge pipeline X70M hot-rolled coil for having superior low temperature block hammer performance smelts component weight percentages setting are as follows: C:0.06-0.08%, Si:0.10-0.20%, Mn:1.55-1.75%, P :≤0.015%, S :≤0.004%, Nb:0.060-0.070%, Ti:0.020-0.030%, Al:0.020-0.050%, Mo:0.12-0.20%, Cr:0.15-0.25%, Ca:0.001 0-0.0030%, Ni:0.10-0.20%, N :≤60ppm, H :≤2ppm, O :≤30ppm.The present invention makes full use of the advance of 2250 hot rolling producing line equipment, pass through accurately technology controlling and process, produce the think gauge X70M hot rolled strip for having superior low temperature block hammer performance, the high efficiency of modern hot rolling producing line is improved simultaneously, continuity, the generation for avoiding pendulum steel temperature control phenomenon, shortens the delivery cycle, has won the consistent favorable comment of client.
Description
Technical field
The present invention relates to a kind of efficiently productions to have the think gauge X70M pipeline hot rolled strip of superior low temperature block hammer performance
Preparation method.
Background technique
The features such as pipeline transportation has efficiently, economic, energy conservation, environment friendly and pollution-free, therefore it is defeated to be used as oil and natural gas
The first choice sent.In order to ensure the stability and safety of transportational process, think gauge is generallyd use with high-pressure delivery pipeline over long distances
Pipe line steel.
In order to avoid pipe-line is by the security risk of populated area, the synthesis of pipe-line steel
Performance requirement is especially high, need to have the features such as low-temperature flexibility and good welding performance while having high intensity, need exist for
It is emphasized that the drop weight tearing performance requirement of crack arrest characteristic is quite harsh.DWTT drop weight tearing performance is as pipeline steel
One important indicator of quality judging, drop hammer test can more react stopping for pipeline Steel material itself compared with Charpy-type test
Fragility.In order to guarantee safety of steel for pipe during conveying high-pressure oil gas, need to be mentioned while improving steel for pipe intensity
The thickness of high steel for pipe.But with the increase of steel band material thickness, block hammer performance is deteriorated, tough crisp turn of drop hammer test
Temperature increases.In order to guarantee excellent low temperature block hammer performance, steel mill needs to execute zerolling technique in the actual production process,
Pendulum steel temperature control is carried out before slab enters finish rolling, is greatly reduced hot rolling production capacity, is influenced rhythm of production, not can guarantee pipe factory
Time of delivery.Therefore, develop a kind of production method, can efficiently produce think gauge high-grade pipe line steel X70M and
The low temperature block hammer performance of customer demand, it appears particularly important.
Patent CN106282798A discloses a kind of think gauge X65M pipe line steel and its production method, chemical component:
C:0.03%~0.06%, Si:0.10%~0.30%, Mn:1.40%~1.60%, P :≤0.020%, S :≤0.010%,
Nb:0.030%~0.039%, V:0.06%~0.08%, Ti:0.008%~0.019%, Cr:0.15%~0.30%,
Its chemical component is not added with expensive Mo and Ni element.The patent is cooling using double sections during hot rolling reeling, finish rolling knot
10 DEG C~30 DEG C of medium temperature higher than coiling temperature is cooled to 20 DEG C/s~30 DEG C/s cooling velocity after beam.Then air-cooled
4s~6s is finally cooled to 450 DEG C~530 DEG C of coiling temperature with 8 DEG C/s~12 DEG C/s cooling velocity and batch protecting
Demonstrate,prove excellent low temperature block hammer performance.But in the two section type cooling procedure of the invention, since leading portion coldplate belt surface exists largely
Moisture film and steam blanket, coiling temperature hit rate is poor in back segment cooling procedure, and performance inconsistency phenomenon is serious, is not suitable for batch efficiently
Produce think gauge high-grade pipe line steel.
Patent CN103388110A discloses a kind of method improved compared with think gauge X60 pipeline steel block hammer performance, changes
It studies point: C :≤0.12%, Si :≤0.40%, Mn :≤1.60%, P :≤0.025%, S :≤0.015%, Nb+V+Ti≤
0.15%, Cu≤0.20%, Cr≤0.20%, Ni≤0.10%, As≤0.08%, CE (Pcm)≤0.25%, ∑ Mn:
1.80%~2.05%.The patent is the production for cut deal, and roughing carries out low speed rolling, mill speed 1.5m/s~
2.5m/s, roughing total deformation rate >=60%, rear 3 single pass reduction ratio are greater than 15%；Finish rolling start rolling temperature 880 DEG C~920
DEG C, 760 DEG C~800 DEG C of finish rolling finishing temperature obtains the low temperature block hammer performance for meeting client agreement in turn.But the patent roughing is adopted
With low speed rolling, stringent and lower finish rolling start rolling temperature, it will lead to the generation that steel temperature control technique is put in production process, thus
Stringent and lower finish rolling start rolling temperature is hit, everything all will seriously affect hot rolling production efficiency, and it is thick to be not suitable for efficiently production
Specification high-grade pipe line steel hot-rolled coil.
Patent CN105950973A discloses the excellent think gauge X80 pipeline steel of cut deal ultralow temperature block hammer performance
Plate and its manufacturing method.The characteristics of patent is that TMCP uses two-phase control rolling and intermediate base cooling: the first stage is recrystallization
Area's rolling, for finishing temperature control at 1050 DEG C~1100 DEG C, recrystallization zone controls the single pass of continuous two to three passage when rolling
Reduction ratio is not less than 22%, and intermediate base cooling is that intermediate base is moderately cooled to second stage by intermediate base appropriateness cooling system
Non- recrystallization zone start rolling temperature, intermediate base cooled down in a manner of swinging back and forth in intermediate base appropriateness cooling system,
Two-stage is the rolling of non-recrystallization zone, and start rolling temperature is not higher than 880 DEG C, and finishing temperature control is in phase transformation critical-temperature Ar3 ± 15
℃.The patent can obtain excellent low temperature block hammer performance, but seriously affect production efficiency, and it is high to be not suitable for efficiently production think gauge
Level pipeline pipeline steel hot-rolled coil.
In conclusion the equal Shortcomings of traditional production method and disadvantage: the low-temperature flexibility in order to guarantee customer requirement is wanted
Steel mill need to sacrifice production capacity, reduce rhythm of production execution pendulum steel temperature control technique or steel mill formulates other cumbersome production technologies, surely
Qualitative difference, strip lumber recovery is low with qualification rate to lead to that the production cost increases, and profit space is small.
Therefore, a kind of mode for preparing think gauge line steel hot rolling strip is needed at present, can efficiently be produced, and is maximized full
Sufficient producing line designs capacity requirements, and can guarantee the low-temperature flexibility of think gauge line steel hot rolling roll bending, and what especially low temperature dropped hammer stops
Fragility energy, the invention patent can effectively overcome the shortcomings of traditional mode of production mode, in the stringent low-temperature crack arrest for guaranteeing customer demand
On the basis of performance, the production capacity design for playing hot rolling producing line can be maximized, really efficiently produces think gauge pipe line steel X70M in batches
Hot-rolled coil.
Summary of the invention
Technical problem to be solved by the present invention lies in overcome problems of the prior art, provide a kind of efficient life
Produce the preparation method for having the think gauge X70M pipeline hot rolled strip of superior low temperature block hammer performance.
It is to solve the above-mentioned problems the technical scheme is that such:
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:
Smelting step is as follows:
Step 1 is smelted: molten iron takes off S using KR method, enters the control of converter molten iron S content within 0.005%, in conjunction with high-quality
Steel scrap carries out double refinings of LF refining and RH application of vacuum, and Calcium treatment guarantees soft blow time >=15min after feeding silk；
Step 2, continuous casting: casting machine is using permanent casting speed control, pulling rate 1.0~1.5m/min of range, plate blank coarse micro-grain tissue test piece
On must not have an impact properties of product shrinkage cavity, bubble, crackle, be mingled with, continuous casting billet center segregation is not greater than 0.5 grade of B class, center
It is loose to be not greater than 1.0 grades；
Hot-rolled step is as follows:
Step 1, slab are handled using cold charge heating furnace, 30~60min of soaking time during heating of plate blank, time inside furnace
180~300min, 1160~1170 DEG C of actual temperature of coming out of the stove.
Step 2, roughing, two stand reversible roughing mills, roughing use 6 passage rough rolling process of " 1+5 " mode, and speed is rolled in roughing
R1:1.5m/s, R2:2.0m/s, R3~R6:2.2m/s, roughing dephosphorization water are opened using road road, dephosphorization water pressure 22Mpa；
Step 3, finish rolling: 4 roller of finish rolling, 7 tandem mill, finishing stands use the constant speed rolling of speed 2.35m/s, finish rolling finish to gauge
810 ± 15 DEG C of temperature；
Step 4, cooling: by the pipe line steel after rolling with the cooling velocity cooling temperature of 20~30 DEG C/s to 400~440
DEG C, it is final to obtain the thickness 17.5mm pipe line steel X70M hot-rolled coil with superior low temperature block hammer performance.
The think gauge pipeline X70M hot rolled strip for having superior low temperature block hammer performance smelts component weight percentages setting are as follows:
C:0.06-0.08%, Si:0.10-0.20%, Mn:1.55-1.75%, P :≤0.015%, S :≤0.004%, Nb:
0.060-0.070%, Ti:0.020-0.030%, Al:0.020-0.050%, Mo:0.12-0.20%, Cr:0.15-
0.25%, Ca:0.0010-0.0030%, Ni:0.10-0.20%, N :≤60ppm, H :≤2ppm, O :≤30ppm.
Beneficial effect, the present invention make full use of the advance of 2250 hot rolling producing line equipment, raw by accurately technology controlling and process
Output has the think gauge X70M hot rolled strip of superior low temperature block hammer performance, while improving the high efficiency of modern hot rolling producing line,
Continuity avoids the generation of pendulum steel temperature control phenomenon, shortens the delivery cycle, won the consistent favorable comment of client.
Detailed description of the invention
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments；
Fig. 1 is the metallographic structure figure of 1 pipe line steel of the present embodiment.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
Embodiment 1:
Using KR method desulphurised hot metal and high-quality steel scrap, desulfurization slag takes off the bis- refinings of clear area >=90%, LF+RH, at RH vacuum
After reason, adjustment argon flow makes molten steel be in soft blow state, and feeding calcium silk carries out Calcium treatment, guarantees the soft blow time after feeding silk
Greater than 15min, prevent molten steel exposed.The casting of slab whole process protection carries out continuous casting, using dynamic soft reduction technology, to reduce continuous casting
Base center segregation, slab cold charge enter furnace.
0.5 grade of slab center porosity, 0.5 grade of center segregation B class, cold charge enters furnace, and 1167 DEG C of tapping temperature, soaking time
51min, time inside furnace 182min.Fast R1:1.5m/s, R2:2.0m/s, R3~R6:2.2m/s, roughing dephosphorization hydromining are rolled in roughing
It is opened with road road, dephosphorization water pressure 22Mpa, finishing stands use the constant speed rolling of speed 2.35m/s, finish rolling finishing temperature 818
DEG C, 416 DEG C of coiling temperature, obtain the think gauge X70M pipe line steel for having superior low temperature block hammer performance.
Embodiment 2:
Using KR method desulphurised hot metal and high-quality steel scrap, desulfurization slag takes off the bis- refinings of clear area >=90%, LF+RH, at RH vacuum
After reason, adjustment argon flow makes molten steel be in soft blow state, and feeding calcium silk carries out Calcium treatment, guarantees the soft blow time after feeding silk
Greater than 15min, prevent molten steel exposed.The casting of slab whole process protection carries out continuous casting, using dynamic soft reduction technology, to reduce continuous casting
Base center segregation, slab cold charge enter furnace.
1.0 grades of slab center porosity, 0.5 grade of center segregation B class, cold charge enters furnace, and 1160 DEG C of tapping temperature, soaking time
50min, time inside furnace 187min.Fast R1:1.5m/s, R2:2.0m/s, R3~R6:2.2m/s, roughing dephosphorization hydromining are rolled in roughing
It is opened with road road, dephosphorization water pressure 22Mpa, finishing stands use the constant speed rolling of speed 2.35m/s, finish rolling finishing temperature 825
DEG C, 435 DEG C of coiling temperature, obtain the think gauge X70M pipe line steel for having superior low temperature block hammer performance.
Embodiment 3:
Using KR method desulphurised hot metal and high-quality steel scrap, desulfurization slag takes off the bis- refinings of clear area >=90%, LF+RH, at RH vacuum
After reason, adjustment argon flow makes molten steel be in soft blow state, and feeding calcium silk carries out Calcium treatment, guarantees the soft blow time after feeding silk
Greater than 15min, prevent molten steel exposed.The casting of slab whole process protection carries out continuous casting, using dynamic soft reduction technology, to reduce continuous casting
Base center segregation, slab cold charge enter furnace.
0.5 grade of slab center porosity, 0.5 grade of center segregation B class, cold charge enters furnace, and 1165 DEG C of tapping temperature, soaking time
56min, time inside furnace 180min.Fast R1:1.5m/s, R2:2.0m/s, R3~R6:2.2m/s, roughing dephosphorization hydromining are rolled in roughing
It is opened with road road, dephosphorization water pressure 22Mpa, finishing stands use the constant speed rolling of speed 2.35m/s, finish rolling finishing temperature 820
DEG C, 425 DEG C of coiling temperature, obtain the think gauge X70M pipe line steel for having superior low temperature block hammer performance.
The pipe line steel constituent content that detection Examples 1 to 3 obtains, as a result as follows:
The pipe line steel that Examples 1 to 3 obtains carries out mechanical properties test, and inspection result is as follows:
As it can be seen that the yield strength 545MPa~560MPa for the pipe line steel that the embodiment of the present invention 1~3 obtains, -30 DEG C of Charpy punchings
Function 304.2J~347.4J is hit, -20 DEG C of block hammer performances 99%~100%, while intensity is met customer need, low-temperature flexibility is excellent
It is different.
The pipe line steel obtained to inventive embodiments 1 is observed, and metallographic structure is as shown in Figure 1, tissue is needle-shaped iron element
Body+pearlite+a small amount of bainite structure, the pipeline steel quality that the display embodiment of the present invention 1 obtains are good.
2250 hot rolling producing lines are waited for 16~17 pieces of think gauge L485M of hourly output of temperature by traditional finish rolling forward swing steel, and promotion is arrived
25~26 pieces of hourly output (weighing about 750~780t) of dead beat steel temperature control production, compared to tradition pendulum steel temperature control technique, hourly output
9~10 pieces (270t~300t) is promoted, the delivery cycle is significantly shortened, has obtained the consistent approval of client.
The present invention uses low C, and the design concept of the elements such as high Mn+ microalloy Nb, Mo, Ti gives full play to 2250 hot rollings production
The advance of line equipment has efficiently produced thickness specification 17.5mm pipe line steel X70M in batches, has guaranteed that -20 DEG C of customer demand are low
While warm block hammer performance, series of temperatures test measures drop hammer test ductile-brittle transition temperature lower than -30 DEG C, improves hot rolling
While pipe line steel production capacity, it ensure that the safety and low-temperature flexibility of steel for pipe, greatly increase becoming a useful person for steel for pipe
Rate and qualification rate bring considerable economic benefit for steel mill.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed range of the invention patent is by the attached claims
Book and its equivalent define.
Claims (2)
1. a kind of efficiently production has the preparation method of the think gauge X70M pipeline hot rolled strip of superior low temperature block hammer performance, special
Sign is,
Smelting step is as follows:
Step 1 is smelted: molten iron takes off S using KR method, enters the control of converter molten iron S content within 0.005%, in conjunction with high-quality steel scrap
Double refinings of LF refining and RH application of vacuum are carried out, Calcium treatment guarantees soft blow time >=15min after feeding silk；
Step 2, continuous casting: casting machine is using permanent casting speed control, pulling rate 1.0~1.5m/min of range, in plate blank coarse micro-grain tissue test piece not
The shrinkage cavity for the properties of product that must have an impact, crackle, is mingled with bubble, and continuous casting billet center segregation is not greater than 0.5 grade of B class, center porosity
It is not greater than 1.0 grades；
Hot-rolled step is as follows:
Step 1, slab are handled using cold charge heating furnace, 30~60min of soaking time during heating of plate blank, time inside furnace 180
~300min, 1160~1170 DEG C of actual temperature of coming out of the stove.
Step 2, roughing, two stand reversible roughing mills, roughing use 6 passage rough rolling process of " 1+5 " mode, and fast R1 is rolled in roughing:
1.5m/s, R2:2.0m/s, R3~R6:2.2m/s, roughing dephosphorization water are opened using road road, dephosphorization water pressure 22Mpa；
Step 3, finish rolling, 4 roller of finish rolling, 7 tandem mill, finishing stands use the constant speed rolling of speed 2.35m/s, finish rolling finishing temperature
810±15℃；
Step 4, cooling: by the pipe line steel after rolling with the cooling velocity cooling temperature of 20~30 DEG C/s to 400~440 DEG C, most
The thickness 17.5mm pipe line steel X70M hot-rolled coil with superior low temperature block hammer performance is obtained eventually.
2. the think gauge X70M pipeline hot rolling that a kind of efficiently production according to claim 1 has superior low temperature block hammer performance
The preparation method of strip, characterized in that the think gauge pipeline X70M hot rolled strip for having superior low temperature block hammer performance smelts ingredient
Weight percent setting are as follows: C:0.06-0.08%, Si:0.10-0.20%, Mn:1.55-1.75%, P :≤0.015%, S :≤
0.004%, Nb:0.060-0.070%, Ti:0.020-0.030%, Al:0.020-0.050%, Mo:0.12-0.20%, Cr:
0.15-0.25%, Ca:0.0010-0.0030%, Ni:0.10-0.20%, N :≤60ppm, H :≤2ppm, O :≤30ppm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811451357.6A CN109402354A (en) | 2018-11-30 | 2018-11-30 | 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 |
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| CN201811451357.6A CN109402354A (en) | 2018-11-30 | 2018-11-30 | 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207138A (en) * | 2020-09-25 | 2021-01-12 | 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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| WO2017221690A1 (en) * | 2016-06-22 | 2017-12-28 | Ｊｆｅスチール株式会社 | Hot-rolled steel sheet for thick high strength line pipes, welded steel pipe for thick high strength line pipes, and manfuacturing method therefor |
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| CN102127697A (en) * | 2011-02-22 | 2011-07-20 | 中国石油天然气集团公司 | Production method of X70 steel grade elbow pipes and pipe fittings |
| CN102851590A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Acid resistant low manganese X70 pipeline steel and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112207138A (en) * | 2020-09-25 | 2021-01-12 | 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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