CN107326261A - The high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs and its manufacture method - Google Patents
The high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs and its manufacture method Download PDFInfo
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- CN107326261A CN107326261A CN201710457719.1A CN201710457719A CN107326261A CN 107326261 A CN107326261 A CN 107326261A CN 201710457719 A CN201710457719 A CN 201710457719A CN 107326261 A CN107326261 A CN 107326261A
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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
- 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
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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
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention provides a kind of high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs, its chemical composition is by mass percentage：C:0.04~0.065%, Si:0.15~0.30%, Mn:0.8~1.15%, P:≤ 0.012%, S:≤ 0.0015%, N:≤ 0.006%, Nb:0.025~0.04%, Ti:0.010~0.025%, Cr:0.1~0.3%, Als:0.02~0.05%, remaining is Fe and inevitable impurity.The present invention is controlled by the combination of composition and technique, high intensity, low yield strength ratio, excellent Properties of HIC resistance and the SSCC performances of the high-strength acid-resistant pipeline steel of Thin Specs can be realized, not only cost is lower, intensity is higher, thinner specification can be realized, control to smelting, the operation of rolling is also relatively easy, and the control of production efficiency and process cost is greatly improved.
Description
Technical field
The present invention relates to pipeline steel making field, in particular to a kind of high-strength acid-resistant pipeline steel hot rolling of low yield strength ratio Thin Specs
Roll bending and its manufacture method.
Background technology
Oil, natural gas are still mainly to the dependence of the energy in current world wide, however as " sweet gas " easily exploited
It is progressively exhausted, rich in H2" acid gas " the exploitation dynamics of S gases is just progressively increased.Conventional pipe line steel is due to members such as C, Mn, P, S
Cellulose content is higher, causes easily to form the hydrogen atom agglomerated defects such as banded structure, MA and strip MnS in finished product pipeline structure of steel, from
And cause hydrogen induced cracking (HIC).Though acid-resistant pipeline steel can be prevented effectively from the generation of drawbacks described above, due to take low C, low Mn into
Split system causes finished steel plate yield tensile ratio significantly to raise, especially for being that yield tensile ratio controls difficulty for Thin Specs acid-resistant pipeline steel
It is bigger.Though can improve armor plate strength using addition Cu, Cr, Ni, Mo alloying element, surrender and tension are raised simultaneously, yield tensile ratio
Still difficult control reduced levels, while cost is greatly improved, economy is not good.
In the prior art, Publication No. CN104099522A Chinese patent literature, disclosing one kind, " no cupro-nickel is antiacid
Pipeline steel X52 MS and its hot-rolled sheet coil manufacture method ", its chemical composition is mainly C:0.02~0.06wt%, Si:0.05~
0.35wt%, Mn:1.0~1.4wt%, P≤0.018wt%, S≤0.003wt%, Cr:0.10~0.50wt%, Ti:0.005
~0.10wt%, Nb:0.005~0.10wt%, V:C content is 0.035% in 0~0.05wt%, its preferred finished steel plate,
This requires the content no more than 0.02% of carbon during converter tapping, it is desirable to too high, can major injury converter, reduction furnace life.Together
When embodiment in finished steel plate it is most thin be only 9.4mm, yield tensile ratio reaches 0.91, and the thinner product of specification does not reach technology will
Ask.
Separately there is Publication No. CN102851590A Chinese patent literature, disclose a kind of " low manganese X70 pipe line steels of acid-resisting
And its production method ", its chemical composition uses C：0.05~0.07%, Si：0.10~0.25%, Mn：1.05~1.25%, P：
0~0.019%, S：0~0.006%, Nb：0.06~0.09%, Ti：0.010~0.020%, Mo：0.20~0.30%, Ni：
0.05~0.30%, Cu：0.05~0.30%, Als：0.015~0.040%, although the yield tensile ratio of its 8mm steel plate is as little as
0.84, but Cu, Ni, Mo addition reach 0.20~0.25% simultaneously under its specification, cost of alloy is too high.
In addition, Publication No. CN102021476A Chinese patent literature, discloses a kind of " inexpensive acid-resisting pipe line steel
Hot-rolled coil and its manufacture method ", its chemical composition and main technique are：C：0.04~0.10%, Si：0.05~0.50%,
Mn：1.00~1.70%, P≤0.015%, S≤0.002%, Nb≤0.08%, Ti：0.005~0.030%, Als：0.010
~0.050%, Ca：0.0010-0.0040%, N≤0.0060%, H≤0.0002%, O≤0.0010%, are rolled using two benches
System, 550~700 DEG C of red temperature, its finished steel plate 6.25,7.0mm specifications Rt0.5≤350MPa, Rm≤450MPa belong to low
Intensity rank acid-resistant pipeline steel.
From the point of view of existing low yield strength ratio, the patent of acid-resistant pipeline steel and document, inexpensive Thin Specs acid-resistant pipeline steel
The contradictory requirements of high intensity and low yield strength ratio need to solve by further optimizing composition design and cooling controlling and rolling controlling process.
The content of the invention
It is an object of the invention to provide a kind of high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs and its manufacturer
Method, the hot-rolled coil has acid-resisting, while yield tensile ratio is low, intensity is high, thickness of thin, its manufacture method step is simple, cost is low,
It is suitable for industrialized production.
To achieve the above object, the present invention provides a kind of high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs, it
Chemical composition be by mass percentage：C:0.04~0.065%, Si:0.15~0.30%, Mn:0.8~1.15%, P:
≤ 0.012%, S:≤ 0.0015%, N:≤ 0.006%, Nb:0.025~0.04%, Ti:0.010~0.025%, Cr:0.1
~0.3%, Als:0.02~0.05%, remaining is Fe and inevitable impurity.
It is preferred that, the metallographic structure of the line steel hot rolling roll bending is polygonal ferrite+pearlite.
It is preferred that, [H]+[O]+[N] content≤100ppm of the line steel hot rolling roll bending.
The effect of each element and main technique and mechanism in the present invention：
C：C content is 0.04~0.065% in the present invention.Carbon is most economical, maximally effective intensified element in steel.But carbon exists
Center segregation is easily produced in smelting process, causes steel plate center portion to produce the hydrogen atom agglomerated defects such as pearlite band or M/A islands,
Hic resistance and SSCC performances is caused to decline to a great extent.Present invention design carbon content is 0.04~0.065%, if carbon content is less than
0.04% one side converter decarburization is difficult, and difficulty is smelted in increase；Another aspect loss of strength is larger, and armor plate strength does not reach will
Ask.Corrosion cracking risk is multiplied under HIC the and SSCC environment of steel plate if higher than 0.065%.
Si：Si contents are 0.15~0.30% in the present invention.This yuan have solution strengthening and deoxidation, and content is less than
0.15% can not work, but can deteriorate modeling, the toughness of pipe line steel if higher than 0.30%, especially for welding heat affected zone
Impact reduction it is notable.
Mn：Mn contents are 0.8~1.15% in the present invention, and manganese is the cheap alloy element for being only second to carbon, not only may be used
To significantly improve the intensity of steel, and it can expand austenite stable region, expand hot processing temperature region.But Mn is fallen within easily partially
Element is analysed, in the enrichment of thickness of slab center, M/A or bainite band is formed, if less than 0.8%, strengthening not sufficiently effective, if being higher than
1.15%, easily in strand center portion formation segregated zone, reduces the Antacid effectiveness of steel plate.
Nb：Nb contents are 0.025~0.04% in the present invention, and niobium can significantly improve the austenite recrystallization temperature of steel,
Expand Unhydrated cement scope, be the refinement most effective element of original austenite grain, while being also the essential element of precipitation strength.By
In present invention is generally directed to thin specification steel plate, therefore use relatively low Nb composition designs.If right but Nb contents are less than 0.025%
It is faint in intensity contribution, cause with high costs if higher than 0.040%, waste of resource.
Ti：Ti content is 0.01~0.025% in the present invention.Titanium is that a kind of strong carbide and nitride form member
Element, steel reheat and high temperature austenite area, rough rolling process in can prevent Austenite Grain Growth, in welding process refine
Heat affected area crystal grain, improves impact flexibility.It is not enough to original austenite grain refining effect if its content is less than 0.01%, if
Bulky grain TiN is likely to form higher than 0.025%, steel plate center portion is enriched in, steel plate toughness and Antacid effectiveness is significantly reduced.
N：N≤0.006% in the present invention.Belong to normal remaining in converter steel, can be combined with titanium in steel (Ti), niobium (Nb)
TiN particles and Nb (C, N) miscible precipitate are formed, suppression Austenite Grain Growth and precipitation strength effect is played.Excessive N with
Ti formation bulky grain TiN, deteriorate toughness, damage steel plate Antacid effectiveness.
Cr：Cr content is 0.10~0.30% in the present invention.The stronger solution strengthening effect of chromium, and cheap, energy
It is enough effectively to substitute the expensive alloying elements such as Mo, Ni, reduce production cost.In addition, add certain chromium can also improve steel it is weather-proof,
Decay resistance and quenching degree.If content is less than 0.1%, invigoration effect can not be played；If higher than 0.30%, weldering can be deteriorated
Connect performance.
Als：Als content is 0.02~0.05% in the present invention.Aluminium is main deoxidant element in steel, can significantly be dropped
Oxygen content in low steel, being capable of effectively crystal grain thinning while aluminium and nitrogen combine to form AlN.But aluminium content exceedes in steel
When a certain amount of, the oxide for being easily caused aluminium is mingled with obvious increase, reduces the cleanliness factor of steel, unfavorable to Antacid effectiveness.
P、S:The content of its in the present invention is respectively：[P]≤0.012%, [S]≤0.0015%.Phosphorus is easily caused the cold short of steel,
Sulphur easily causes hot-short, excessive S can also combine to form strip MnS with the Mn in steel and is mingled with, as HIC crackle originating points, therefore
Should be tried one's best the phosphorus reduced in steel, the content of sulphur, while using Ca processing, nodularization field trash.Consider production cost and performance requirement
P, S element in the present invention is limited to the level.
[H]、[O]、[N]：Total content [H]+[O]+[N]≤100ppm of three kinds of gaseous impurities in the present invention.Gaseous impurity
Purity of steel can be reduced, field trash is formed and is present in steel, as hydrogen atom accumulation regions, therefore the reduction that should try one's best.It is less than
100ppm could effectively reduce HIC and SSCC risks.
The present invention also provides a kind of manufacture method of the high-strength acid-resistant pipeline steel hot-rolled coil of above-mentioned low yield strength ratio Thin Specs, its
Step includes：
1) smelted using converter-LF stoves-vacuum drying oven, and be cast into strand；
2) shove charge is again heated to 1150~1250 DEG C after strand slow cooling；
3) roughing is carried out, rolling temperature is controlled at 1020~1100 DEG C；
4) finish rolling is carried out, start rolling temperature is controlled at 950~1000 DEG C, and finishing temperature control is at 850~900 DEG C；
5) cool down：Cold temperature control is opened at 810~850 DEG C, red temperature control is in 500~580 DEG C, cooling velocity control
In 10~15 DEG C/s；
6) it is cooled to after room temperature and obtains the high-strength acid-resistant pipeline steel hot-rolled coil of the low yield strength ratio Thin Specs.
It is preferred that, the step 1) in vacuum processing time be no less than 15min.
It is preferred that, the step 2) in total time inside furnace be 140~160min.
It is preferred that, the step 3) in rough rolling step accumulation reduction ratio >=65%.
It is preferred that, the step 4) in finish rolling stage accumulation reduction ratio >=70%.
It is preferred that, the step 6) in room temperature is cooled to after batching.
The more conventional pipe line steel of acid-resistant pipeline steel solution strengthening element C, Mn is low, causes yield tensile ratio to control difficulty increase.It is low
Cost, high strengthening are the developing direction in pipe line steel field, and this requires that drop this while is solved using the cold process meanses of control control
High strengthening problem, although cooling velocity, which is improved, can greatly improve armor plate strength, but for thin slab product, cooling velocity mistake
Conference causes excessive grain to refine, yield tensile ratio rise, the dangerous increase of engineer applied.The present invention combines the antiacid pipeline of Thin Specs
These characteristics of steel, yield tensile ratio, Thin Specs, high intensity three are solved in the case of a small amount of Nb, Cr is only added by process meanses
Contradictory problems, its main innovation point is：1) acid-resisting feature is directed to, is designed using relatively low C, Mn, wherein Mn contents are
0.8~1.15% reduces Mn center segregation, homogenizes tissue.2) High Clean Steel Melts smelting technique, considered critical steel grade has
HIC, SSCC cracking risk caused by field trash is greatly reduced in the total content of evil gas, [H]+[O]+[N]≤100ppm.3)
Suitable 10~15 DEG C/s of cooling velocity, and 500~580 DEG C of red temperature are set, prevents cooling velocity is excessive from causing crystal grain mistake
Degree refinement, yield tensile ratio rise, simultaneously because using the cooling velocity and red temperature, it is ensured that high-strength under low component system
Spend characteristic.
The present invention is compared with prior art：The problem of Thin Specs pipe line steel low yield strength ratio is not only solved, be ensure that simultaneously
The quality stability of high intensity acid-resistant pipeline steel under the component system of low cost.The low yield strength ratio Thin Specs of the present invention are high-strength anti-
Sour pipe line steel hot-rolled coil：1) mechanical property：Yield strength (transverse direction)：Rt0.5>=450MPa, tensile strength：Rm>=520MPa, prolongs
Stretch rate：A50.8>=30%, yield tensile ratio：Rt0.5/Rm≤ 0.90, -20 DEG C of v-notch ballistic work (impact specimen sizes：5×10×
55mm)：KV2≥110J；- 15 DEG C, drop weight tearing toughness DWTT：SA >=90%；Vickers hardness：HV10≤200.2) acid-resisting
Energy：TM0284-2003A solution, initial p H=2.7 soaks 96h, CSR≤2%, CLR≤15%, CTR≤5%；TM0177-
2005, solution A, four-point bending test, constant load loading stress is 0.72*Rt0.5, amplify × 10 times, low-powered microscope observation nothing
Crackle.
The beneficial effects of the present invention are：
The more conventional pipe line steel of acid-resistant pipeline steel solution strengthening element C, Mn is low, causes yield tensile ratio to control difficulty increase.It is low
Cost, high strengthening are the developing direction in pipe line steel field, and this requires that drop this while is solved using the cold process meanses of control control
High strengthening problem, although cooling velocity, which is improved, can greatly improve armor plate strength, but for thin slab product, cooling velocity mistake
Conference causes excessive grain to refine, yield tensile ratio rise, the dangerous increase of engineer applied.The present invention combines the antiacid pipeline of Thin Specs
These characteristics of steel, yield tensile ratio, Thin Specs, high intensity three are solved in the case of a small amount of Nb, Cr is only added by process meanses
Contradictory problems.The present invention is directed to acid-resisting feature, is designed using relatively low C, Mn, reduces Mn center segregation, homogenizes
Tissue.High Clean Steel Melts smelting technique is used simultaneously, and the considered critical total content of steel grade pernicious gas is greatly reduced because of field trash
Caused HIC (hydrogen induced cracking (HIC)), SSCC (sulfide-stress cracking) cracking risk.And it is suitable to set in the fabrication process
10~15 DEG C/s of cooling velocity, and 500~580 DEG C of red temperature prevents cooling velocity is excessive from causing excessive grain to refine, bends
Strong ratio rise, due to using the cooling velocity and red temperature, it is ensured that high-strength characteristic.The present invention passes through composition and manufacturer
Method technology controlling and process has obtained not only having acid-resisting, and yield tensile ratio is low, intensity is high, thickness of thin is simultaneously lower-cost low in the wrong strong
Acid-resistant pipeline steel hot-rolled coil more high-strength than Thin Specs, with very strong practicality.
Embodiment
Below by way of specific embodiment to the present invention the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs and its
Manufacture method is further described：
Table 1 lists the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs of 1~embodiment of embodiment 10 and right
The acid-resistant pipeline steel hot-rolled coil chemical composition of ratio 1 and comparative example 2
Percetage by weight (surplus is Fe and inevitable impurity).
The chemical composition (wt, %) of the embodiment of table 1
Embodiment 1~10
The high-strength acid-resistant pipeline steel hot-rolled coil of the low yield strength ratio Thin Specs of 1~embodiment of embodiments of the invention 10 is according to as follows
Method manufacture is obtained, and specific process parameter is as shown in table 2：
1) smelted using converter-LF stoves-vacuum drying oven, and be cast into base.Wherein, vacuum processing time is no less than 15min.
2) shove charge is again heated to 1150~1250 DEG C, total 140~160min of time inside furnace after slow cooling 24h.
3) roughing is carried out, rolling temperature is controlled in 1020~1100 DEG C, rough rolling step accumulation reduction ratio >=65%.
4) finish rolling is carried out, start rolling temperature control is at 950~1000 DEG C, and finishing temperature control is at 850~900 DEG C, accumulation pressure
Lower rate >=70%.
5) cool down：Cold temperature control is opened at 810~850 DEG C, red temperature control is in 500~580 DEG C, cooling velocity control
In 10~15 DEG C/s.
6) batched after water outlet, be cooled to room temperature.
Comparative example 1
The acid-resistant pipeline steel hot-rolled coil of comparative example 1 of the present invention is manufactured in the following way to be obtained, and specific process parameter is such as
Shown in table 2：
A) molten iron is pre-processed, it is ensured that S content is less than 40ppm in molten iron, converter smelting, and S mass fraction 8 after RH stoves~
12ppm.Ca/S ratios are more than 2, and casting process uses dynamic soft reduction technology.B) 1200~1280 DEG C of heating furnace relation reheating temperature,
950~1050 DEG C of roughing final temperature, 1010~1027 DEG C of entry temperature at finishing, 820~900 DEG C of finish rolling final temperature.C) adopt
With section cooling, the cooling sparse cooling of leading portion or air cooling, 500~600 DEG C are batched.
Comparative example 2
The acid-resistant pipeline steel hot-rolled coil of comparative example 1 of the present invention is manufactured in the following way to be obtained, and specific process parameter is such as
Shown in table 2：
A) molten steel is cast into base after converter-LF stoves and vacuum drying oven.B) it is direct in 500~850 DEG C of temperature after continuous casting terminates
Into heating stove heat, come out of the stove for 1150~1250 DEG C and rolled；Two-stage control rolling is carried out through roughing mill and finishing mill, slightly
950~1050 DEG C of finishing temperature is rolled, 770~870 DEG C of finish rolling finishing temperature, finish rolling compression ratio >=60% is cold using laminar flow after rolling
But device is controlled cooling, 8~20 DEG C/s of cooling rate, 550~700 DEG C of final cooling temperature.Concrete technology system：Heating-up temperature 1150
~1250 DEG C, roughing finishing temperature be 950~1050 DEG C, finish rolling finishing temperature be 770~870 DEG C, final cooling temperature be 550~
700℃。
The manufacturing approach craft parameter of each embodiment of table 2
Various embodiments above and comparative example steel plate are subjected to performance detection, its main performance testing result is as shown in table 3, main
Want Properties of HIC resistance as shown in table 4, main anti-SSCC performances are as shown in table 5.
Each embodiment main performance testing result of table 3
Each embodiment Properties of HIC resistance testing result of table 4
The anti-SSCC performance test results of each embodiment of table 5
Controlled from can be seen that the present invention with the result of 3~table of upper table 5 by the combination of composition and technique, it is possible to achieve
The high intensity of the high-strength acid-resistant pipeline steel of Thin Specs, low yield strength ratio, excellent Properties of HIC resistance and SSCC performances under low component system,
For comparative example, not only cost is lower for the invention, and intensity is higher, it is possible to achieve thinner specification, to smelting, rolling
The control of journey is also relatively easy, and the control of production efficiency and process cost is greatly improved.
The scientific research personnel of technical field can according to the above-mentioned change for making content and form unsubstantiality without departing from
Institute's essential scope of the present invention, therefore, the present invention is not limited to above-mentioned specific embodiment.
Claims (9)
1. a kind of high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs, it is characterised in that：Its chemical composition presses quality
Percentage is calculated as：C:0.04~0.065%, Si:0.15~0.30%, Mn:0.8~1.15%, P:≤ 0.012%, S:≤
0.0015%th, N:≤ 0.006%, Nb:0.025~0.04%, Ti:0.010~0.025%, Cr:0.1~0.3%, Als:
0.02~0.05%, remaining is Fe and inevitable impurity.
2. the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 1, it is characterised in that：It is described
The metallographic structure of line steel hot rolling roll bending is polygonal ferrite+pearlite.
3. the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 1, it is characterised in that：It is described
[H] of line steel hot rolling roll bending+[O]+[N] content≤100ppm.
4. the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs any one of a kind of manufacturing claims 1~3
Method, it is characterised in that：Its step includes：
1) smelted using converter-LF stoves-vacuum drying oven, and be cast into strand；
2) shove charge is again heated to 1150~1250 DEG C after strand slow cooling；
3) roughing is carried out, rolling temperature is controlled at 1020~1100 DEG C；
4) finish rolling is carried out, start rolling temperature is controlled at 950~1000 DEG C, and finishing temperature control is at 850~900 DEG C；
5) cool down：Cold temperature control is opened at 810~850 DEG C, red temperature control is at 500~580 DEG C, and cooling velocity is controlled 10
~15 DEG C/s；
6) it is cooled to after room temperature and obtains the high-strength acid-resistant pipeline steel hot-rolled coil of the low yield strength ratio Thin Specs.
5. the manufacture method of the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 4, it is special
Levy and be：The step 1) in vacuum processing time be no less than 15min.
6. the manufacture method of the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 4, it is special
Levy and be：The step 2) in total time inside furnace be 140~160min.
7. the manufacture method of the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 4, it is special
Levy and be：The step 3) in rough rolling step accumulation reduction ratio >=65%.
8. the manufacture method of the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 4, it is special
Levy and be：The step 4) in finish rolling stage accumulation reduction ratio >=70%.
9. the manufacture method of the high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs according to claim 4, it is special
Levy and be：The step 6) in room temperature is cooled to after batching.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710457719.1A CN107326261A (en) | 2017-06-16 | 2017-06-16 | The high-strength acid-resistant pipeline steel hot-rolled coil of low yield strength ratio Thin Specs and its manufacture method |
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| CN109047692A (en) * | 2018-08-22 | 2018-12-21 | 江阴兴澄特种钢铁有限公司 | A kind of ultra-thin size high-tensile steel plate that can be used under the conditions of -60 DEG C and its manufacturing method |
| CN109047694A (en) * | 2018-08-23 | 2018-12-21 | 江阴兴澄特种钢铁有限公司 | A kind of economical HIC resistance pipeline steel plate X65MS and its manufacturing method of TMCP delivery |
| CN110284077A (en) * | 2019-07-24 | 2019-09-27 | 宝钢湛江钢铁有限公司 | A kind of manufacturing method of thin gauge high tenacity pipe line steel |
| CN111790753A (en) * | 2020-05-28 | 2020-10-20 | 南京钢铁股份有限公司 | Wide and thin X60 steel grade pipeline steel of single-stand steckel mill and rolling method |
| CN111910126A (en) * | 2020-08-06 | 2020-11-10 | 东北大学 | Thick high-toughness X80 pipeline steel and production method thereof |
| CN112239836A (en) * | 2020-10-31 | 2021-01-19 | 江苏沙钢集团有限公司 | B-grade acid-resistant pipeline steel and preparation method thereof |
| CN113388785A (en) * | 2021-06-25 | 2021-09-14 | 张家港宏昌钢板有限公司 | Acid-resistant pipeline steel plate and preparation method thereof |
| CN113846268A (en) * | 2021-09-26 | 2021-12-28 | 江苏省沙钢钢铁研究院有限公司 | X70MS acid-resistant pipeline steel plate and preparation method thereof |
| CN115298340A (en) * | 2020-03-26 | 2022-11-04 | 杰富意钢铁株式会社 | High-strength steel sheet for acid-resistant line, method for producing same, and high-strength steel pipe using high-strength steel sheet for acid-resistant line |
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| CN109047694A (en) * | 2018-08-23 | 2018-12-21 | 江阴兴澄特种钢铁有限公司 | A kind of economical HIC resistance pipeline steel plate X65MS and its manufacturing method of TMCP delivery |
| CN109047694B (en) * | 2018-08-23 | 2020-05-22 | 江阴兴澄特种钢铁有限公司 | Economic HIC-resistant pipeline steel plate X65MS for TMCP delivery and manufacturing method thereof |
| CN110284077A (en) * | 2019-07-24 | 2019-09-27 | 宝钢湛江钢铁有限公司 | A kind of manufacturing method of thin gauge high tenacity pipe line steel |
| CN110284077B (en) * | 2019-07-24 | 2021-06-01 | 宝钢湛江钢铁有限公司 | Manufacturing method of thin-gauge high-toughness pipeline steel |
| CN115298340A (en) * | 2020-03-26 | 2022-11-04 | 杰富意钢铁株式会社 | High-strength steel sheet for acid-resistant line, method for producing same, and high-strength steel pipe using high-strength steel sheet for acid-resistant line |
| CN115298340B (en) * | 2020-03-26 | 2023-10-31 | 杰富意钢铁株式会社 | High-strength steel sheet for acid-proof pipeline, method for producing same, and high-strength steel pipe using high-strength steel sheet for acid-proof pipeline |
| CN111790753A (en) * | 2020-05-28 | 2020-10-20 | 南京钢铁股份有限公司 | Wide and thin X60 steel grade pipeline steel of single-stand steckel mill and rolling method |
| CN111910126A (en) * | 2020-08-06 | 2020-11-10 | 东北大学 | Thick high-toughness X80 pipeline steel and production method thereof |
| CN112239836A (en) * | 2020-10-31 | 2021-01-19 | 江苏沙钢集团有限公司 | B-grade acid-resistant pipeline steel and preparation method thereof |
| CN113388785A (en) * | 2021-06-25 | 2021-09-14 | 张家港宏昌钢板有限公司 | Acid-resistant pipeline steel plate and preparation method thereof |
| CN113846268A (en) * | 2021-09-26 | 2021-12-28 | 江苏省沙钢钢铁研究院有限公司 | X70MS acid-resistant pipeline steel plate and preparation method thereof |
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