CN105063494B - Think gauge X60 pipe line steels and its production method - Google Patents
Think gauge 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 think gauge X60 pipe line steels and its production method.It is an object of the invention to provide a kind of cost is low, and the good think gauge X60 pipe line steels such as intensity, toughness, drop weight tearing performance can be kept.The technical proposal for solving the technical problem of the invention is：Think gauge X60 pipe line steels, its chemical composition is constituted by weight percentage is：C：0.05 0.10%, Si：0.10 0.30%, Mn：1.30 1.50%, P：≤ 0.020%, S：≤ 0.010%, Nb：0.020 0.034%, V：0.05 0.08%, Ti：0.008 0.019%, Cr：0.15 0.30%, remaining is Fe and inevitable impurity.The present invention need not add the elements such as Mo, Ni of costliness, it is not required that its entry temperature at finishing, advantage of lower cost, and rolling mill practice be greatly lowered simply, strong operability.In addition, 465~500MPa of yield strength of 12mm 17mm of the present invention think gauge X60 pipe line steels, tensile strength 560~590MPa, 20 DEG C of ballistic work >=140J, 20 DEG C of sections of shear more than 94% of dropping hammer.
Description
Technical field
The present invention relates to hot continuous rolling steel band and its production method, more particularly to a kind of think gauge X60 pipe line steels and its life
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 having efficient, economic, safe and pollution-free with pipeline petroleum gas is to convey 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 the other steel grade of higher intensity level, 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, and cost is high, and the patent is
Produced in Stand Mill close-coupled steckel rolling system, its steel billet after roughing is delayed 40-60 seconds, is less than roughing steel billet temperature
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
Need to treat temperature, low production efficiency.
In method of a kind of raising compared with think gauge X60 pipeline steel block hammer performances that patent CN103388110A is disclosed, change
Control C≤0.12, Si≤0.40, Mn≤1.60, P≤0.025 and S≤0.015 studied point, and meet following condition：(1) also
Combination added with Nb, V, Ti or between them, Nb, V and Ti content sum≤0.15%；(2) be additionally added Cr, Mo, Ni and
Cu or the combination between them, (3) ∑ Mn value must be met between 1.80~2.05, had in the chemical composition of the invention
Cr, Mo, Ni and Cu or the combination between them, its production cost are higher.
In the case where not influenceing its intensity, toughness and drop weight tearing performance, if think gauge X60 pipelines can be reduced further
The cost of steel, is the further object that those skilled in the art pursue.
The content of the invention
It is an object of the invention to provide a kind of cost is low, and the good thickness such as intensity, toughness, drop weight tearing performance can be kept
Specification X60 pipe line steels.
The technical proposal for solving the technical problem of the invention is：Think gauge X60 pipe line steels, its chemical composition is by weight
Percentage is constituted：C：0.05-0.10%, Si：0.10-0.30%, Mn：1.30-1.50%, P：≤ 0.020%, S：≤
0.010%, Nb：0.020-0.034%, V：0.05-0.08%, Ti：0.008-0.019%, Cr：0.15-0.30%, remaining is
Fe and inevitable impurity.
It is preferred that scheme be：C：0.07-0.09%, Si：0.15-0.25%, Mn：1.30-1.42%, P：≤ 0.018%,
S：≤ 0.005%, Nb：0.025-0.034%, V：0.06-0.09%, Ti：0.010-0.017%, Cr：0.20-0.30%, its
Remaining is Fe and inevitable impurity.
The production technology of think gauge X60 pipe line steels of the present invention is hot continuous rolling production technology：Desulfurizing iron → converter smelting is multiple
Chain-wales, which are mended, after conjunction blowing → deoxidation, alloying and the concise slag desulfurization → stove of high alkalinity feeds Al lines, Ti microalloyings → hello calcium line
→ packaging and storage is batched in → continuous casting → heating of plate blank → high-pressure water descaling → roughing → finish rolling → section cooling →.
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) obtained heating of plate blank is through roughing to obtaining middle base after 1185~1220 DEG C；
3) finish rolling：By step 2) the middle base of gained is through mm finishing mill unit finish rolling, and entry temperature at finishing is controlled 960~1000
DEG C, finishing temperature scope is 830~870 DEG C；
4) double sections of coolings：The double section refrigerating modes being combined are cooled down and commonly cool down using reinforcement to be cooled down.Specifically,
10~30 DEG C higher than coiling temperature of medium temperature, air cooling 4~6 seconds are cooled to 15~40 DEG C/s cooling velocity after finish rolling
Afterwards, 560 DEG C~630 DEG C are cooled to 5~15 DEG C/s cooling velocities to batch.
Be used as preferred embodiments of the present invention, step 2) slab rough rolling use 5 passages or 7 passes, every time deflection
Necessary >=20%.
It is used as preferred embodiments of the present invention, step 3) 960~985 DEG C of entry temperature at finishing control, finish rolling road third from the bottom
Secondary deflection more than 20%, the deflection of passage second from the bottom more than 17%, the deflection of last a time 10% with
On, finishing temperature scope is 830~865 DEG C.
It is used as preferred embodiments of the present invention, step 4) double sections of coolings are cold with 20-30 DEG C/sec of cooling velocity after finish rolling
But 10~30 DEG C higher than coiling temperature of medium temperature is arrived, then air cooling is after 4~6 seconds, finally with 8-12 DEG C/sec of cooling velocity
560 DEG C~590 DEG C of coiling temperature is cooled to be batched.
The beneficial effects of the invention are as follows：The present invention need not add the element such as Mo, Ni of costliness, advantage of lower cost, and
Rolling mill practice is simple, strong operability.The present invention is also without being greatly lowered its entry temperature at finishing in addition.It is produced by the invention
465~500MPa of yield strength of 12mm-17mm think gauge X60 pipe line steels, tensile strength 560~590MPa, -20 DEG C are rushed
Hit work(>=140J, -20 DEG C of sections of shear more than 94% of dropping hammer.
Below by way of 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 replaced according to the present invention, without departing from the spirit of the present invention, all should belong to the present invention
Scope of the following claims.
Embodiment
The present invention the technological process of production be：Desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying and high-alkali
Chain-wales benefit hello Al lines, Ti microalloyings → hello calcium line → continuous casting → heating of plate blank → water under high pressure after concise slag desulfurization → stove is spent to remove
→ packaging and storage is batched in squama → roughing → finish rolling → section cooling →.
Think gauge X60 pipe line steels, its chemical composition is constituted by weight percentage is：C：0.05-0.10%, Si：0.10-
0.30%, Mn：1.30-1.50%, P：≤ 0.020%, S：≤ 0.010%, Nb：0.020-0.034%, V：0.05-0.08%,
Ti：0.008-0.019%, Cr：0.15-0.30%, remaining is Fe and inevitable impurity.
It is preferred that scheme be：C：0.07-0.09%, Si：0.15-0.25%, Mn：1.30-1.42%, P：≤ 0.018%,
S：≤ 0.005%, Nb：0.025-0.034%, V：0.06-0.09%, Ti：0.010-0.017%, Cr：0.20-0.30%, its
Remaining is Fe and inevitable impurity.
The production technology of think gauge X60 pipe line steels of the present invention is hot continuous rolling production technology, is comprised 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) obtained heating of plate blank is through roughing to obtaining middle base after 1185~1220 DEG C；
3) finish rolling：By step 2) the middle base of gained is through mm finishing mill unit finish rolling, and entry temperature at finishing is controlled 960~1000
DEG C, finishing temperature scope is 830~870 DEG C, it is ensured that Unhydrated cement deflection, increases Zona transformans, increases phase deformed nucleus core,
Fining ferrite grains；
4) double sections of coolings：The double section refrigerating modes being combined are cooled down and commonly cool down using reinforcement to be cooled down.Specifically,
10~30 DEG C higher than coiling temperature of medium temperature, air cooling 4~6 seconds are cooled to 15~40 DEG C/s cooling velocity after finish rolling
Afterwards, 560 DEG C~630 DEG C are cooled to 5~15 DEG C/s cooling velocities to batch.
Be used as preferred embodiments of the present invention, step 2) slab rough rolling use 5 passages or 7 passes, every time deflection
Necessary >=20%.
It is used as preferred embodiments of the present invention, step 3) 960~985 DEG C of entry temperature at finishing control, finish rolling road third from the bottom
Secondary deflection more than 20%, the deflection of passage second from the bottom more than 17%, the deflection of last a time 10% with
On, finishing temperature scope is 830~865 DEG C.
It is used as preferred embodiments of the present invention, step 4) double sections of coolings are cold with 20-30 DEG C/sec of cooling velocity after finish rolling
But 10~30 DEG C higher than coiling temperature of medium temperature is arrived, then air cooling is finally cold with 8-12 DEG C/sec of cooling velocity after 4~6 seconds
But 560 DEG C~590 DEG C of coiling temperature is arrived to be batched.
Here is 10 embodiments of the present invention, and table 1 is the chemical composition of 10 embodiments of the present 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 | Cr |
| 1 | 0.07 | 0.26 | 1.39 | 0.015 | 0.003 | 0.031 | 0.07 | 0.010 | 0.21 |
| 2 | 0.09 | 0.22 | 1.38 | 0.015 | 0.005 | 0.034 | 0.08 | 0.017 | 0.27 |
| 3 | 0.07 | 0.24 | 1.36 | 0.011 | 0.004 | 0.030 | 0.07 | 0.012 | 0.24 |
| 4 | 0.07 | 0.19 | 1.37 | 0.012 | 0.006 | 0.027 | 0.07 | 0.013 | 0.23 |
| 5 | 0.08 | 0.23 | 1.37 | 0.014 | 0.004 | 0.030 | 0.08 | 0.013 | 0.22 |
| 6 | 0.09 | 0.20 | 1.36 | 0.017 | 0.006 | 0.032 | 0.06 | 0.012 | 0.25 |
| 7 | 0.08 | 0.20 | 1.39 | 0.013 | 0.005 | 0.032 | 0.07 | 0.015 | 0.24 |
| 8 | 0.08 | 0.22 | 1.42 | 0.017 | 0.005 | 0.032 | 0.08 | 0.015 | 0.26 |
| 9 | 0.08 | 0.21 | 1.38 | 0.013 | 0.005 | 0.031 | 0.07 | 0.010 | 0.24 |
| 10 | 0.07 | 0.25 | 1.48 | 0.023 | 0.004 | 0.034 | 0.09 | 0.010 | 0.24 |
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 (4)
1. think gauge X60 pipe line steels, it is characterised in that its chemical composition is by weight percentage：C：0.07-0.09%, Si：
0.15-0.25%, Mn：1.30-1.42%, P：≤ 0.018%, S：≤ 0.005%, Nb：0.025-0.034%, V：0.06-0.09%,
Ti：0.010-0.017%, Cr：0.20-0.30%, 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）Prepare slab：By above-mentioned percentage by weight slab is obtained through smelting, continuous casting；
2）Slab rough rolling：Step 1）Obtained heating of plate blank through roughing to obtaining middle base after 1185~1220 DEG C；
3）Finish rolling：By step 2）Base is in mm finishing mill unit finish rolling in the middle of gained, and entry temperature at finishing is controlled in 960 ~ 985 DEG C, finish rolling
The deflection more than 20% of passage third from the bottom, the deflection of passage second from the bottom is more than 17%, the deflection of last a time
More than 10%, finishing temperature scope is 830 ~ 865 DEG C；
4）Double sections of coolings：After finish rolling with 15~40 DEG C/s cooling velocity be cooled to 10~30 DEG C higher than coiling temperature in the middle of temperature
Degree, air cooling is cooled to 560 DEG C ~ 630 DEG C after 4~6 seconds, with 5~15 DEG C/s cooling velocities and batched；
Wherein, step 2）Slab rough rolling uses 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
2. think gauge X60 pipe line steels according to claim 1, it is characterised in that：Step 4）The cooling of double sections be finish rolling after
10~30 DEG C higher than coiling temperature of medium temperature is cooled to 20~30 DEG C/s cooling velocity, air cooling is after 4~6 seconds, with 8~
12 DEG C/s cooling velocities are cooled to 560 DEG C ~ 590 DEG C and batched.
3. the production method of think gauge X60 pipe line steels, it is characterised in that：The X60 pipe line steels are by hot continuous rolling production technology
Obtain, its production technology is completed by following steps：
1）Prepare slab：Composition according to following weight percents is smelted, continuous casting obtains slab：
C：0.07-0.09%, Si：0.15-0.25%, Mn：1.30-1.42%, P：≤ 0.018%, S：≤ 0.005%, Nb：0.025-
0.034%, V：0.06-0.09%, Ti：0.010-0.017%, Cr：0.20-0.30%, remaining is Fe and inevitable impurity；
2）Slab rough rolling：Step 1）Obtained heating of plate blank through roughing to obtaining middle base after 1185~1220 DEG C；
3）Finish rolling：By step 2）Base is in mm finishing mill unit finish rolling in the middle of gained, and entry temperature at finishing is controlled in 960 ~ 985 DEG C, finish rolling
The deflection more than 20% of passage third from the bottom, the deflection of passage second from the bottom is more than 17%, the deflection of last a time
More than 10%, finishing temperature scope is 830 ~ 865 DEG C；
4）Double sections of coolings：After finish rolling with 15~40 DEG C/s cooling velocity be cooled to 10~30 DEG C higher than coiling temperature in the middle of temperature
Degree, air cooling is cooled to 560 DEG C ~ 630 DEG C after 4~6 seconds, with 5~15 DEG C/s cooling velocities and batched；
Wherein, step 2）Slab rough rolling uses 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
4. the production method of think gauge X60 pipe line steels according to claim 3, it is characterised in that：Step 4）Double sections it is cold
It is to be cooled to 10~30 DEG C higher than coiling temperature of medium temperature after finish rolling with 20~30 DEG C/s cooling velocity, air cooling 4~6
After second, it is cooled to 560 DEG C ~ 590 DEG C with 8~12 DEG C/s cooling velocities and batches.
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| CN105861799B (en) * | 2016-05-31 | 2018-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge pipe line steel containing vanadium and its production method |
| CN106119715A (en) * | 2016-09-05 | 2016-11-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge X60 pipe line steel and production method thereof |
| 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 |
| CN106282799A (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 X52 pipe line steel and production method thereof |
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| CN104109744B (en) * | 2014-07-28 | 2016-11-09 | 攀钢集团西昌钢钒有限公司 | The method improving pipeline steel block hammer 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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