CN107964637B - A kind of CT100 grades of connecting pipes hot rolled strip and production method - Google Patents
A kind of CT100 grades of connecting pipes hot rolled strip and production method Download PDFInfo
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- CN107964637B CN107964637B CN201711325095.4A CN201711325095A CN107964637B CN 107964637 B CN107964637 B CN 107964637B CN 201711325095 A CN201711325095 A CN 201711325095A CN 107964637 B CN107964637 B CN 107964637B
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
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- 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
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C21D2211/002—Bainite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of CT100 grades of connecting pipes hot rolled strip, component and wt%:C:0.10~0.14%, Si:0.10~0.30%, Mn:1.10~1.50%, P :≤0.015%, S :≤0.0020%, Cu:0.25~0.40%, Ni:0.15~0.35%, Cr:0.60~1.00%, Nb:0.020~0.050%, V :≤0.010%, Ti:0.010~0.030%, N :≤0.0050%, Al:0.015~0.060%, Ca:0.0008~0.0025%.Production stage: base is casting continuously to form after the processes such as converter smelting；Slab is heated；Roughing；Finish rolling；It cools down and batches.Theoretical depth of implements of the invention is up to 7000m, actual job depth at least increases by 450 meters, working pressure in well is up to 90 MPa, its yield strength >=640MPa, tensile strength >=740MPa, full plate thickness hardness fluctuations≤23HV1.0, yield tensile ratio≤0.88, elongation percentage >=18%, section vickers hardness hv 1.0≤270, -20 DEG C of low-temperature flexibilities are higher than 100J, and are inclined to without surface copper brittleness.
Description
Technical field
The present invention relates to a kind of pipe line steel and production method, belong to a kind of theoretical depth of implements up to 7000m, underground work pressure
Power reaches the CT100 grade connecting pipes hot rolled strip and production method of 90MPa.
Background technique
Continuous pipe is the novel tube for petroleum drilling and mining industry, is coiled in pipe up to the flexible steel pipe of the supreme myriametre of thousands of rice
On disk, when operation, opens from pipe dish, is coiled in pipe dish again after operation, can Reusability.Compared to conventional oil well
Pipe, continuous oil pipe operation is more flexible, have Operating Pressure, continuously remove, equipment volume is small, duty cycle is fast, at low cost
Advantage.
Before making the present invention, have:
The document that Chinese Patent Application No. is 201611162208.9, discloses a kind of " CT90 grades of connecting pipes hot-rolled steel
Band and its production method ", the product strength level is relatively low, in ultradeep well operation process, is difficult to bear big self weight,
And in operation process steel duct high pressure, with the continuous pipe of the production, theoretical depth of implements is only capable of reaching
6000m, actual job depth is at 3500 meters, and the continuous pipe of this patent production requires theoretical depth of implements to reach 7000m, well
Lower operational pressure reaches 90MPa.
The document that Chinese Patent Application No. is 200710168545.3, disclose " a kind of steel for high-plasticity continuous oil pipe and
Its manufacturing method ", tissue in contain part ferrite and pearlite, this significantly reduces its steel band intensity, according to its whole
Embodiment, yield strength≤590MPa, tensile strength≤700MPa, too low intensity determine that it can not be suitable for ultradeep well and make
Industry；In addition, its alloy and design are so that its steel strip surface is in the presence of the possibility that copper brittleness occurs, easily induction fatigue crack, this can substantially
The fatigue life for reducing steel pipe is also unfavorable to underground work safely.
The document that Chinese Patent Application No. is 200810040895.6, disclose " a kind of CT90 cascade steel for continuous oil pipe and
Its manufacturing method ", intensity are equally insufficient for the needs of ultra-deep well operations；Containing higher in its its ingredient design simultaneously
V, this is unfavorable to the toughness and welding performance of product；For its steel plate yield tensile ratio 0.90 or more, deformability is poor, can not
Meeting in such product operation process needs the requirement being plastically deformed repeatedly.
Summary of the invention
It is an object of the invention to overcome deficiency present in above-mentioned document, a kind of depth of implements is provided and is increased than the prior art
Add no less than 450m, working pressure in well up to 90MPa, yield strength >=640MPa, tensile strength >=740MPa, yield tensile ratio does not surpass
0.88 is crossed, elongation percentage A50mm(tensile sample parallel portion width b=12.5mm) >=18%, section vickers hardness hv 1.0≤270, and
Full plate thickness hardness fluctuations are less than 23HV1.0, CT100 grade connecting pipes hot rolled strip of -20 DEG C of low-temperature flexibilities higher than 100J and life
Production method.
Realize the measure of above-mentioned purpose:
A kind of CT100 grades of connecting pipes hot rolled strip, component and weight percent content are as follows: C:0.10~0.14%,
Si:0.10~0.30%, Mn:1.10~1.50%, P :≤0.015%, S :≤0.0020%, Cu:0.25~0.40%, Ni:0.15~
0.35%, Cr:0.60~1.00%, Nb:0.020~0.050%, V :≤0.010%, Ti:0.010~0.030%, N :≤
0.0050%, Al:0.015~0.060%, Ca:0.0008~0.0025%, surplus are Fe and are inevitably mingled with.
Preferably: the Cu weight percent content is 0.28~0.36%.
Preferably: the Ni weight percent content is 0.18~0.32%.
Preferably: the Cr weight percent content is 0.65~0.93%.
Preferably: the Ca weight percent content is 0.00092~0.002%.
A kind of method for producing CT100 grades of connecting pipes hot rolled strip, step:
1) it is casting continuously to form base after converter, argon station, ladle furnace, vacuum drying oven, Calcium treatment, and by casting blank stacking slow cooling to being no more than
450℃；
2) slab is heated, heating and temperature control keeps the temperature 60~90min at 1260~1320 DEG C at this temperature；
3) roughing is carried out, rolling pass is 6 passages, and controls it and terminate temperature at 1050~1120 DEG C；
4) finish rolling is carried out, and controls finishing temperature at 850~920 DEG C, finish rolling total reduction is not less than 85%；
5) cooled down: being cooled to 550~650 DEG C in the case where cooling velocity is 70~120 DEG C/s, after be air-cooled to 500 again~
600 DEG C are batched.
The effect and mechanism of each element in the present invention
Carbon (C): most economical intensified element promotes the intensity of steel by gap solution strengthening.Increase carbon content, it can be substantially
The harden ability for promoting steel reduces the additional amount of other precious alloys, reduces production cost, while having to the yield tensile ratio for reducing steel
Benefit, therefore C content is unsuitable too low.But carbon content is higher, is more unfavorable for the low-temperature flexibility of steel, while easily being formed in steel grade tighter
The hard phase segregation band of weight, aggravates the structural heterogenity of steel, is unfavorable for the fatigue behaviour of product, therefore carbon content also can not mistake
It is high.The additive amount of convenient carbon is 0.10~0.14%.
Silicon (Si): mainly playing solution strengthening effect, is beneficial to assist desulfurization in smelting process, is also advantageous for promoting the tired of steel
Labor performance.But when too high levels, it is unfavorable for surface quality, easily leads to the iron scale in the operation of rolling and be difficult to remove.Conveniently
Silicon additive amount be 0.10~0.30%.
Manganese (Mn): relatively inexpensive alloy element can be obviously improved the surrender and tensile strength of steel.But manganese content is higher
When, such as inappropriate technology is also easy to produce more serious microstructure segregation, leads to ingredient, the tissue odds of steel.The additive amount of convenient manganese
It is 1.10~1.50%.
Phosphorus, sulphur, nitrogen (P, S, N): phosphorus easily leads to the cold short of steel, and sulphur easily causes hot-short, and nitrogen easily causes the quenching of steel to be failed
It fails with deformation, causes the performance of steel unstable, therefore the content of the phosphorus in steel, sulphur, nitrogen should be reduced as far as possible.
Copper, nickel (Cu, Ni): the intensity of steel can be promoted by solution strengthening, mainly rising in this copper improves the anti-corrosion weather-proof of steel
The effect of performance, general additional amount are 0.25% or more；Nickel can improve the red brittleness because copper is added, and general additional amount is copper content
2/3 or more.Preferably: Cu weight percent content is that 0.28~0.36%, Ni weight percent content is 0.18~0.32%.
Chromium (Cr): the harden ability of steel is effectively promoted, and there is certain solution strengthening effect.Chromium can be in corrosive environment
The surface of steel forms comparatively dense protective layer, plays the role of protecting matrix, effectively improves steel corrosion resistance.But chromium in steel
When too high levels, it is unfavorable for high-frequency resistance welding (HFRW) weldquality, easily formation flat spot, it is necessary to using welding protection, increase weldering
Connect difficulty and cost.The additive amount of convenient easy welding connecting pipes steel chromium is 0.60~1.00%.Preferably Cr weight percent
It is 0.65~0.93% than content.
Niobium, titanium (Nb, Ti): micro alloying element can significantly refine crystal grain and play the role of precipitation strength, be remarkably improved
The austenite recrystallization temperature of steel expands Unhydrated cement range, is easy to implement high temperature controlled rolling, reduces mill load.But it is limited
It is designed in carbon content, when niobium, Ti content are excessively high, is not only difficult to play one's part to the full, while it is coarse not to may cause precipitation particle
Conducive to the toughness of steel.The additive amount of convenient niobium, titanium is respectively 0.020~0.050%, 0.010~0.030%.
Aluminium (Al): aluminium is main deoxidant element in steel, can significantly reduce the oxygen content in steel, while the knot of aluminium and nitrogen
Conjunction forms AlN, can effectively refine crystal grain.But when aluminium content is more than 0.06% in steel, easily lead to aluminium oxide be mingled with it is bright
It is aobvious to increase, the cleanliness of steel is reduced, it is unfavorable to the low-temperature flexibility of steel.The additive amount of convenient aluminium is respectively 0.015~
0.060%。
Calcium (Ca): carrying out Calcium treatment to steel during double refining, can improve the inclusion morphology in steel, improves steel
Impact flexibility, but excessive, the easy cleanliness for reducing steel is added, it is unfavorable to the low-temperature flexibility of steel.Therefore control additive amount is 0.0008
~0.0025%.Preferably Ca weight percent content is 0.00092~0.002%.
In the present invention, why heating temperature is located at 1260~1320 DEG C of ranges to carry out, and kept the temperature at this temperature
60~90min is to realize the homogenization of the easily segregation-alloy element such as Mn, Cr, improves the micro components segregation of steel billet, finally change
The uniformity of the kind final microstructure of steel band.But when heating temperature is lower than 1260 DEG C, element microsegregation improvement is not shown
It writes, or needs too long soaking time to realize the diffusion-homogenization of alloying element, be greatly reduced so as to cause production efficiency；
And as heating temperature increases, austenite grain is gradually roughened, when heating temperature is higher than 1320 DEG C (or heating temperature is higher than
1300 DEG C, but when heating and thermal insulation overlong time), austenite grain is excessively roughened, and leads to final products coarse grains and surrender
Intensity is insufficient.Therefore, convenient heating temperature is at 1260~1320 DEG C, preferred heating temperature at 1260~1300 DEG C,
Soaking time is in 60~90min.
Total reduction >=85% that finish rolling why is set in the present invention, be realize steel band tissue fine and uniformly
Change.It is limited by existing general producing line capacity of equipment, the open rolling in finish rolling stage of the present invention and finishing temperature setting are relatively high, to subtract
Few rolling load, and then guarantee smoothly to produce.But when final rolling temperature is higher, will lead to steel band finishing stands include dynamic again
Crystallization rolling, mixed crystal rolling, non-recrystallization rolling and static recovery, Static Recrystallization, complicated recrystallization and Recovery Process meeting
Lead to the inhomogeneities of steel band crystal grain.And after reduction ratio is promoted, the Recrystallization nucleation point in steel band can be substantially improved, Yi Ji great
It measures high density Zona transformans (providing a large amount of nucleation points for subsequent ferrite transformation), when reduction ratio is more than 85%, sufficient ties again
Brilliant and phase transformation nucleation point, substantially alleviates the influence of the unevenness of crystal grain caused by uneven microdeformation, realizes steel band crystal grain group
The fine and homogenization knitted.
Why batched using Fast Cooling+medium temperature in the present invention, is to obtain the granular bainite microstructure of fine, protect
Demonstrate,prove good comprehensive performance (high intensity, low yield strength ratio, performance uniformity, high tenacity etc.).Pass through Fast Cooling to granular bayesian
Body phase transition temperature interval can avoid high temperature ferrite transformation, form a large amount of polygonal ferrites, causes intensity insufficient, drops simultaneously
Ferritic phase transition temperature in low granular bainite, and realize ferritic refinement, and suitable cooling rate and coiling temperature
Fine with the achievable island Ma Ao, improves the toughness of steel band.But cooling rate is preferably in convenient range, when cooling rate is too low, iron element
Body is excessively coarse；When cooling rate is excessively high, steel strip surface and center portion cooling temperature difference are excessive, lead to thickness direction tissue and hardness not
?；Ingredient design based on product of the present invention, in conventional range (2~7mm), it is proposed that cooling rate works as thickness in 70~120 DEG C/s
When relatively thin, because thickness direction heat transfer is apart from short, steel strip surface and center portion temperature difference can be smaller, can use relatively higher
Cooling rate, on the contrary thickness is more thick and solid, should use relatively low cooling rate.And suitable coiling temperature is at 500~600 DEG C, temperature mistake
Height will lead to the island ferrite Ji Maao organizational coarseness, and the too low formation that will lead to lath-shaped bainite structure of temperature, cause hard
Spend high and toughness reduction.
Why the present invention will demand perfection the fluctuation of plate thickness microhardness less than 23HV1.0, be to guarantee the uniform of steel band performance
Property.Its benefit is that (1) avoids leading to stress raisers in deformation process because locally crossing hard spot in steel band, and then leads to steel pipe mistake
Early failure；(2) nonhomogeneous hardness (or performance difference) for reducing surface and center portion, avoids surface hardness excessively high and deformation is caused to be opened
It splits.
Why the present invention requires the yield tensile ratio of product lower than 0.88, and elongation percentage is not less than 18%, is to guarantee product
Plastic deformation ability.The product needs to be plastically deformed repeatedly in use, and yield tensile ratio is excessively high and elongation percentage is too low, can lead
Cause steel pipe premature fatigue failures.
Compared with prior art, the present invention theoretical depth of implements reaches 7000m, actual depth at least than existing 3500 meters
Increase at least 450 meters, working pressure in well reaches 90MPa, and yield strength >=640MPa, tensile strength >=740MPa, yield tensile ratio is not
More than 0.88, elongation percentage A50mm(tensile sample parallel portion width b=12.5mm) >=18%, section vickers hardness hv 1.0≤270 ,-
20 DEG C of low-temperature flexibilities are higher than 100J, and full plate thickness hardness fluctuations are less than 23HV1.0；And the uniformity of hardness of product is good, toughness is excellent
Good, no surface copper brittleness tendency effectively improves the anti-fatigue performance of product.
Detailed description of the invention
Attached drawing 1 is metallographic structure figure of the invention.
Specific embodiment
The present invention is described in detail below:
Table 1 is the comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example performance text list.
Various embodiments of the present invention produce according to the following steps:
1) it is casting continuously to form base after converter, argon station, ladle furnace, vacuum drying oven, Calcium treatment, and by casting blank stacking slow cooling to being no more than
450℃；
2) slab is heated, heating and temperature control keeps the temperature 60~90min at 1260~1320 DEG C at this temperature；
3) roughing is carried out, rolling pass is 6 passages, and controls it and terminate temperature at 1050~1120 DEG C；
4) finish rolling is carried out, and controls finishing temperature at 850~920 DEG C, finish rolling total reduction is not less than 85%；
5) cooled down: being cooled to 550~650 DEG C in the case where cooling velocity is 70~120 DEG C/s, after be air-cooled to 500 again~
600 DEG C are batched.
The composition value list (wt%) of 1 various embodiments of the present invention of table and comparative example
The main technologic parameters list of 2 various embodiments of the present invention of table and comparative example
3 various embodiments of the present invention of table and comparative example main performance detection statistics table
It can analyze out from table 3, product has high intensity, and in 650MPa or more, tensile strength exists yield strength
760MPa or more；Product yield tensile ratio is lower than 0.88, and elongation percentage is higher than 18.5%, has good deformability；The impact of product
Function is higher than 119J, good-toughness, and full plate thickness hardness fluctuations are less than 23HV1.0.
Above-described embodiment is only the best example, rather than a limitation of the embodiments of the present invention.
Claims (1)
1. a kind of production method of CT100 grades of connecting pipes hot rolled strip, step:
1) it is casting continuously to form base after converter, argon station, ladle furnace, vacuum drying oven, Calcium treatment, and by casting blank stacking slow cooling to being no more than 450
℃；
2) slab is heated, heating and temperature control keeps the temperature 60~90min at 1260~1320 DEG C at this temperature；
3) roughing is carried out, rolling pass is 6 passages, and controls it and terminate temperature at 1050~1120 DEG C；
4) finish rolling is carried out, and controls finishing temperature at 850~920 DEG C, finish rolling total reduction is not less than 85%；
5) cooled down: cooling velocity be 70~120 DEG C/s under be cooled to 550~650 DEG C, after be air-cooled to 500~600 again
It DEG C is batched；
The component and weight percent content of the CT100 grades of connecting pipes hot rolled strip are as follows: C:0.10~0.14%, Si:0.10
~0.30%, Mn:1.10~1.50%, P≤0.015%, S≤0.0020%, Cu:0.25~0.40%, Ni:0.15~0.35%, Cr:
0.60~1.00%, Nb:0.020~0.050%, V≤0.010%, Ti:0.010~0.030%, N≤0.0050%, Al:0.015~
0.060%, Ca:0.0008~0.0025%, surplus are Fe and are inevitably mingled with.
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| CN115386796B (en) * | 2022-08-15 | 2023-03-03 | 马鞍山钢铁股份有限公司 | Hot-rolled steel strip for CT 150-grade continuous oil pipe and production method thereof |
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| US20060060267A1 (en) * | 2004-09-17 | 2006-03-23 | Benson Dan T | Method for extending the life of thin walled tubing and austempered weld stress relieved thin walled tubing |
| JP2006144109A (en) * | 2004-11-24 | 2006-06-08 | Jfe Steel Kk | Electric resistance welded tube having excellent crack resistance in weld zone and its production method |
| WO2013108861A1 (en) * | 2012-01-18 | 2013-07-25 | Ｊｆｅスチール株式会社 | Steel strip for coiled tubing and method for producing same |
| CN102899581B (en) * | 2012-10-29 | 2015-09-02 | 莱芜钢铁集团有限公司 | A kind of CT80 cascade steel for continuous oil pipe material |
| CN106498287B (en) * | 2016-12-15 | 2018-11-06 | 武汉钢铁有限公司 | A kind of CT90 grades of connecting pipes hot rolled strip and its production method |
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