CN105063482B - X60 pipe line steels and its production method - Google Patents
X60 pipe line steels and its production method Download PDFInfo
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Abstract
The present invention relates to hot continuous rolling steel band and its production method, more particularly to a kind of X60 pipe line steels and its production method.The technical proposal for solving the technical problem of the invention is：X60 pipe line steels, its chemical composition constitutes and is by weight percentage：C：0.05 0.10%, Si：0.10 0.30%, Mn：1.20 1.40%, P：≤ 0.020%, S：≤ 0.010%, Nb：0.020 0.034%, V：0.05 0.08%, Ti：0.008 0.019%, remaining is Fe and inevitable impurity.The present invention need not add element, advantage of lower cost, and the rolling mill practices such as Mo, Ni of costliness simple, strong operability.In addition, the X60 pipe line steels of present invention production have a stable mechanical property, obdurability matching is good and the characteristics of excellent welding performance.
Description
Technical field
The invention belongs to hot-rolling plate with production technical field, more particularly to a kind of X60 pipe line steels and its production method.
Background technology
In railway, highway, aviation, 5 kinds of means of transportation of water transport and pipeline, pipeline transportation be a kind of economic, safety not between
Disconnected means of transportation, the characteristics of have efficient, economical, safe and pollution-free with pipeline petroleum gas, be conveying oil gas most
Effective instrument.With developing rapidly for pipeline engineering, developing rapidly for pipe line steel production has been driven.
Oil, natural gas transmission pipeline are divided into long-distance transport pipes and infield gathering line two parts.Long-distance transport pipes are
Raising transfer efficiency, backbone discharge pressure is higher, it is desirable to select higher intensity level other steel grade, such as X70, X80 rank；Collection
Defeated pipeline, branch line and the less pipeline delivery pressure of some throughput rates are relatively low, the general steel grade relatively low from intensity.A large amount of backbones
The construction of line, has driven the demand of below X65 ranks level pipe line steel to sharply increase.
In the prior art, in a kind of X60 pipe line steels disclosed in patent CN101928882A and its production method, its chemistry
Composition：C：0.060~0.080%, Si：0.15~0.30%, Mn：1.35~1.55%, P：≤ 0.020%, S：≤
0.006%, Nb：0.035~0.055%, V：0.035~0.055%, Ti：0.010-0.025%, Als：0.010-
0.040%.Nb contents are up to 0.035~0.055% in its chemical composition, and its alloying component is higher, high cost, and the patent is
Produced in Stand Mill close-coupled steckel rolling system, it is less than roughing steel billet temperature by steel billet time delay 40-60 seconds after roughing
900 DEG C are carrying out the continuous finish rolling of 3 passages, and 790-830 DEG C of finishing temperature is not suitable for hot continuous rolling production.
16~25mm thickness X60 pipe line steels and its production method, its component disclosed in patent CN103526110A：C：0.06~
0.09%th, Si：0.25~0.35%, Mn：1.55~1.60%, (Nb+Ti+V+Mo+Ni)：0.20~0.29%, P≤
0.010%th, S≤0.003%, Als：0.02~0.04%.The pipe line steel is applied on heavy and medium plate mill, the X60 pipelines of production
The tissue of steel contains 42~46% lath columnar ferrites, 32~38% acicular ferrites, 13~15% bainites, a small amount of M-A islands
And some small and dispersed precipitated phases.In addition, containing noble metals such as noble metal Mo, Ni in the pipe line steel, cost is of a relatively high.
Document《The development of X 60 pipeline steel in Jiusteel Company》In, Jiuquan Iron ＆ Steel Co.'s composition design (unit, wt%) is
C≤0.1%, Si≤0.4%, Mn：1.3%th, V：0.05~0.10%, Nb：0.02~0.04%, Ti：0.02~0.05%, P
≤ 0.03%, S≤0.025%, 1020~1080 DEG C of perfect recrystallization area start rolling temperature, Unhydrated cement start rolling temperature during rolling
≤ 950 DEG C, 700~850 DEG C of finishing temperature.Cooling uses ADCO Spray Cooling System rapid cooling, 630~700 DEG C of final cooling temperature.Should
Pipe line steel uses Nb+V+Ti combined microalloyings, its Ti content 0.02~0.05%, the steel-making of Ti-containing steel and hot rolling technology requirement
Height, technological fluctuation is very big to Effect on Mechanical Properties, simultaneously as it is using " low temperature, big pressure " rolling, in hot continuous rolling
Needs treat temperature, low production efficiency.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of low cost, the simple X60 pipe line steels of rolling mill practice.
Technical scheme：X60 pipe line steels, its chemical composition constitutes and is by weight percentage：C：0.05-
0.10%, Si：0.10-0.30%, Mn：1.20-1.40%, P：≤ 0.020%, S：≤ 0.010%, Nb：0.020-
0.034%, V：0.05-0.08%, Ti：0.008-0.019%, remaining is Fe and inevitable impurity.
Preferred scheme is：C：0.07-0.09%, Si：0.15-0.25%, Mn：1.25-1.40%, P：≤ 0.018%,
S：≤ 0.005%, Nb：0.025-0.034%, V：0.05-0.08%, Ti：0.008-0.010%, remaining is Fe and can not keep away
The impurity exempted from.
The production technology of pipe line steel of the present invention is hot continuous rolling production technology：Desulfurizing iron → converter smelting top-bottom blowing → de-
Oxygen, alloying and chain-wales benefit hello Al lines, Ti microalloyings → feed calcium line → continuous casting → plate after the concise slag desulfurization → stove of high alkalinity
Base heating → high-pressure water descaling → roughing → finish rolling → section cooling → batch → packaging and storage.
Specifically, comprise the following steps：
1) slab is prepared：Slab is obtained according to above-mentioned percentage by weight continuous casting；
2) slab rough rolling：Step 1) heating of plate blank that obtains, to middle base is obtained through roughing after 1185~1220 DEG C, both protected
The abundant solid solution of Nb, V is demonstrate,proved, the abnormal growth of austenite crystal is prevented again；Preferred scheme, slab rough rolling uses 5 passages or 7 roads
Secondary rolling, every time deflection is necessary >=and 20%, it is ensured that austenite recrystallization, fining austenite grains.
3) finish rolling：By step 3) through mm finishing mill unit finish rolling, entry temperature at finishing is controlled 960~1000 the middle base of gained
DEG C, finishing temperature scope is 830~870 DEG C, it is ensured that Unhydrated cement deflection, increases phase deformed nucleus core, fining ferrite
Crystal grain；
4) batch：560 DEG C~630 DEG C are cooled to 10-40 DEG C/sec of cooling velocity to batch.
As preferred embodiments of the present invention, step 3) entry temperature at finishing control 980~990 DEG C, finishing temperature scope
It is 840~865 DEG C.
As preferred embodiments of the present invention, step 4) cooling is that cooling velocity with 29-35 DEG C/sec after finish rolling is cooled to
590 DEG C~620 DEG C are batched.
The beneficial effects of the invention are as follows：The X60 pipe line steel low costs that the present invention is provided, rolling mill practice is simple, with mechanics
Stable performance, obdurability matching is good and the characteristics of excellent welding performance.480~565MPa of its yield strength, tensile strength 520
~760MPa, -20 DEG C of ballistic work >=160J, -20 DEG C of sections of shear more than 99% of dropping hammer.
Below by way of specific embodiment, the present invention is described in further detail, but is not intended to limit the present invention, ability
Field technique personnel are variously modified and replace according to the present invention, without departing from spirit of the invention, all should belong to the present invention
Scope of the following claims.
Specific embodiment
The technological process of production of the invention is：Desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying and high-alkali
Spend chain-wales after concise slag desulfurization → stove and mend and feed Al lines, Ti microalloyings → feed calcium line → continuous casting → heating of plate blank → water under high pressure and remove
Squama → roughing → finish rolling → section cooling → batch → packaging and storage.
X60 pipe line steels, by the way that after conventional converter smelting, continuous casting, the chemical composition of finished steel constitutes and is by weight percentage：
C：0.05-0.10%, Si：0.10-0.30%, Mn：1.20-1.40%, P：≤ 0.020%, S：≤ 0.010%, Nb：0.020-
0.034%, V：0.05-0.08%, Ti：0.008-0.019%, remaining is Fe and inevitable impurity.
Preferred scheme is：C：0.07-0.09%, Si：0.15-0.25%, Mn：1.25-1.40%, P：≤ 0.018%,
S：≤ 0.005%, Nb：0.025-0.034%, V：0.05-0.08%, Ti：0.008-0.010%, remaining is Fe and can not keep away
The impurity exempted from.
The production technology of pipe line steel of the present invention comprises the following steps for hot continuous rolling production technology：
1) slab is prepared：Slab is obtained according to above-mentioned percentage by weight continuous casting；
2) slab rough rolling：Step 1) slab heating temperature that obtains is 1185~1220 DEG C of insulations, roughing obtains middle base,
Both the abundant solid solution of Nb, V had been ensured, the abnormal growth of austenite crystal had been prevented again；Preferred scheme is, according to finished product thickness not
Together, 200~250mm thick slab is by 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
3) finish rolling：By step 3) through mm finishing mill unit finish rolling, entry temperature at finishing controls 960~1000 DEG C to the middle base of gained,
Finishing temperature scope is 810~880 DEG C.
4) batch：560 DEG C~630 DEG C are cooled to after finish rolling with 10-40 DEG C/sec of cooling velocity to batch.
As preferred embodiments of the present invention, step 3) entry temperature at finishing control 980~990 DEG C, finishing temperature scope
It is 840~865 DEG C.
As preferred embodiments of the present invention, step 4) cooling is that cooling velocity with 29-35 DEG C/sec after finish rolling is cooled to
590 DEG C~620 DEG C are batched.
Here is 10 embodiments of the invention, and table 1 is the chemical composition of 10 embodiments of the invention, and table 2 is hot rolling
Technology controlling and process value, table 3 is the mechanical property of coil of strip.
The chemical composition of the embodiment of table 1
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti |
| 1 | 0.07 | 0.18 | 1.33 | 0.017 | 0.005 | 0.030 | 0.08 | 0.014 |
| 2 | 0.08 | 0.23 | 1.37 | 0.014 | 0.002 | 0.033 | 0.07 | 0.016 |
| 3 | 0.09 | 0.20 | 1.26 | 0.015 | 0.005 | 0.034 | 0.07 | 0.013 |
| 4 | 0.09 | 0.20 | 1.34 | 0.018 | 0.003 | 0.031 | 0.07 | 0.014 |
| 5 | 0.09 | 0.22 | 1.34 | 0.016 | 0.003 | 0.029 | 0.07 | 0.016 |
| 6 | 0.08 | 0.21 | 1.31 | 0.018 | 0.004 | 0.030 | 0.05 | 0.017 |
| 7 | 0.09 | 0.23 | 1.39 | 0.014 | 0.004 | 0.034 | 0.06 | 0.014 |
| 8 | 0.06 | 0.21 | 1.40 | 0.013 | 0.004 | 0.033 | 0.08 | 0.018 |
| 9 | 0.08 | 0.19 | 1.34 | 0.014 | 0.004 | 0.029 | 0.06 | 0.015 |
| 10 | 0.08 | 0.21 | 1.26 | 0.017 | 0.005 | 0.034 | 0.05 | 0.014 |
The hot rolling technology controlling value of the embodiment of table 2
The mechanical property of the coil of strip of the embodiment of table 3
Claims (6)
1.X60 pipe line steels, it is characterised in that its chemical composition constitutes and is by weight percentage：C：0.07-0.09%, Si：
0.15-0.25%, Mn：1.25-1.40%, P：≤ 0.018%, S：≤ 0.005%, Nb：0.025-0.034%, V：0.07-
0.08%, Ti：0.008-0.010%, remaining is Fe and inevitable impurity；
The X60 pipe line steels are obtained by hot continuous rolling production technology, and its production technology is completed by following steps：
1) slab is prepared：According to above-mentioned percentage by weight slab is obtained through smelting, continuous casting；
2) slab rough rolling：Step 1) heating of plate blank that obtains is through roughing to obtaining middle base after 1185~1220 DEG C；
3) finish rolling：By step 2) through mm finishing mill unit finish rolling, entry temperature at finishing is controlled at 960~1000 DEG C the middle base of gained, eventually
Temperature range is rolled for 830~870 DEG C；
4) cool down：560 DEG C~630 DEG C are cooled to 10-40 DEG C/sec of cooling velocity to batch；
Step 2) slab rough rolling uses 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
2. X60 pipe line steels according to claim 1, it is characterised in that：Step 3) entry temperature at finishing control 980~
990 DEG C, finishing temperature scope is 840~865 DEG C.
3. X60 pipe line steels according to claim 1, it is characterised in that：Step 4) cooling be after finish rolling with 29-35 DEG C/
The cooling velocity of second is cooled to 590 DEG C~620 DEG C and batches.
The production method of 4.X60 pipe line steels, it is characterised in that：The X60 pipe line steels are obtained by hot continuous rolling production technology, its
Production technology is completed by following steps：
1) slab is prepared：Composition according to following weight percents obtains slab through smelting, continuous casting：C：0.07-0.09%, Si：
0.15-0.25%, Mn：1.25-1.40%, P：≤ 0.018%, S：≤ 0.005%, Nb：0.025-0.034%, V：0.07-
0.08%, Ti：0.008-0.010%, remaining is Fe and inevitable impurity；
2) slab rough rolling：Step 1) heating of plate blank that obtains is through roughing to obtaining middle base after 1185~1220 DEG C；
3) finish rolling：By step 2) through mm finishing mill unit finish rolling, entry temperature at finishing is controlled at 960~1000 DEG C the middle base of gained, eventually
Temperature range is rolled for 830~870 DEG C；
4) cool down：560 DEG C~630 DEG C are cooled to 10-40 DEG C/sec of cooling velocity to batch；
Step 2) slab rough rolling uses 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
5. the production method of X60 pipe line steels according to claim 4, it is characterised in that：Step 3) entry temperature at finishing
980~990 DEG C of control, finishing temperature scope is 840~865 DEG C.
6. the production method of X60 pipe line steels according to claim 4, it is characterised in that：Step 4) cooling be after finish rolling
590 DEG C~620 DEG C are cooled to 20-35 DEG C/sec of cooling velocity to batch.
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| CN106282798A (en) * | 2016-09-05 | 2017-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge X65 pipe line steel and production method thereof |
| CN110541109B (en) * | 2019-07-26 | 2021-10-15 | 邯郸钢铁集团有限责任公司 | Acid-resistant pipeline steel X60MOS for seabed and production method thereof |
| CN111451277A (en) * | 2020-03-30 | 2020-07-28 | 包头钢铁（集团）有限责任公司 | X65 pipeline steel plate and plate shape control method thereof |
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| CN104109744A (en) * | 2014-07-28 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Method for improving pipeline steel drop-weight performance |
| CN104404378A (en) * | 2014-12-19 | 2015-03-11 | 山东钢铁股份有限公司 | Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate |
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| CN100549188C (en) * | 2006-06-01 | 2009-10-14 | 上海宝钢工程技术有限公司 | Molten steel refining vacuum channel standby preheating device and method |
| JP5504717B2 (en) * | 2009-07-08 | 2014-05-28 | 新日鐵住金株式会社 | Manufacturing method of ERW steel pipe for sour line pipe |
| 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 |
| CN104046896B (en) * | 2014-03-14 | 2016-05-11 | 武汉钢铁(集团)公司 | A kind of economical X65 petroleum natural gas pipeline steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104109744A (en) * | 2014-07-28 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Method for improving pipeline steel drop-weight performance |
| CN104404378A (en) * | 2014-12-19 | 2015-03-11 | 山东钢铁股份有限公司 | Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate |
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