CN104694844B - Production method of X65M pipeline steel - Google Patents
Production method of X65M pipeline steel Download PDFInfo
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- CN104694844B CN104694844B CN201510141936.0A CN201510141936A CN104694844B CN 104694844 B CN104694844 B CN 104694844B CN 201510141936 A CN201510141936 A CN 201510141936A CN 104694844 B CN104694844 B CN 104694844B
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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
- C21D8/0221—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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- 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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a production method of X65M pipeline steel. The production method includes the following steps of smelting, continuous casting of a sheet billet, heating, dephosphorization, recrystallization zone controlled rolling, cooling non-recrystallization zone controlled rolling, controlling cooling and tempering. The chemical component system of the pipeline steel is reasonably designed, the two-stage controlled rolling and controlled cooling process under low-temperature high pressure conditions is adopted, the starting rolling temperature, finish rolling temperature, starting cooling temperature, finish cooling temperature, cooling speed and other process parameters are controlled, a mixture with granular bainite and ferrite is obtained and is fine in grain and good in low-temperature rigidity, and therefore batched production of large-wall-thickness and high-steel-stage pipeline steel is realized, and meanwhile it is guaranteed that produced pipeline steel is high in rigidity and low in production cost.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, especially relate to a kind of x65m pipe line steel and its production method.
Background technology
Recently as the fast development of oil, gas industry, for improving transfer efficiency and security further, long away from
Develop from pipe line steel forward direction Hi-grade steel, big wall thickness, bigbore direction used by feed-line.
Meanwhile, the requirement also more and more higher of the obdurability to pipe line steel for the long distance delivery pipeline.
At present, supply exceed demand for domestic steel, and market competition is extremely miserable, and the production cost reducing pipe line steel is to improve pipeline
The maximally effective approach of the product made from steel market competitiveness.
Therefore, how to provide a kind of production method of pipe line steel, while can producing big wall thickness, Hi-grade steel pipe line steel
Ensure that the pipe line steel of output has a higher obdurability, and production cost relatively low be those skilled in the art's urgent need to resolve technology
Problem.
Content of the invention
In view of this, it is an object of the present invention to provide a kind of production method of x65m pipe line steel, this production method energy
Enough produce the pipe line steel of big wall thickness, Hi-grade steel, ensure that the pipe line steel of output has higher obdurability simultaneously, and production cost is relatively
Low.
For solving above-mentioned technical problem, the technical scheme that the present invention provides is:
A kind of production method of x65m pipe line steel, comprises the following steps:
1) smelt: molten iron is utilized clean steel production technology output molten steel, gained molten steel includes following percentage by weight
Chemical composition: c:0.03%～0.08%, si:0.15%～0.35%, mn:1.10%～1.60%, p:0～0.012%, s:
0～0.003%, nb:0.02%～0.06%, ti:0.015%～0.025%, mo:0～0.25%, cu:0～0.35%,
Ni:0～0.30%, cr:0～0.20%, al:0.015%～0.050%, remaining is fe and inevitable impurity, o in steel,
The total weight percent of n, h, p and s is 0～0.015%；
2) continuous casting steel billet: by step 1) gained molten steel adopt dynamic soft reduction technology continuous casting output slab, gained slab
Center segregation reaches c class below 1.5, then slow cooling；
3) heating: by step 2) gained slab is heated to 1100 DEG C～1220 DEG C；
4) dephosphorization: by step 3) gained slab utilize water dephosphorization with pressure；
5) recrystallization zone controlled rolling: by step 4) gained slab carries out base in the middle of recrystallization zone controlled rolling output, then
During crystal region controlled rolling, the temperature range of slab is 1050 DEG C～980 DEG C, and most end percentage pass reduction is 18%～23%,
Accumulation reduction ratio is 50%-70%；
6) cooling down: by step 5) base utilizes water cooling with pressure in the middle of gained；
7) Unhydrated cement controlled rolling: by step 6) base carries out Unhydrated cement controlled rolling output pipeline in the middle of gained
Steel, during Unhydrated cement controlled rolling, the temperature of middle base is 800 DEG C～900 DEG C, and the rolling temperature of most end passage is 780
DEG C～820 DEG C, accumulation reduction ratio is 65%～75%, and the thickness of gained pipe line steel is 26.97mm～31.75mm.
8) controlling cooling: by step 7) gained pipe line steel is controlled cooling down, and opens 730 DEG C～790 DEG C of cold temperature, eventually cold temperature
300 DEG C～500 DEG C of degree, 15 DEG C/s～25 DEG C of cooldown rate/s；
9) it is tempered: by step 8) gained Pipeline Steel Plate carries out nature tempering using the method for stacking slow cooling, removes internal stress.
Preferably, described step 1) in molten steel composition ni element be that molten iron is remaining.
Preferably, described step 2) in slab thickness be 250mm～300mm, temperature retention time be 48h～72h.
Preferably, described step 3) in the temperature of bringing-up section and soaking zone be 1100 DEG C～1220 DEG C, described soaking zone
Temperature retention time is 30min～40min, described step 3) carry out 250min～300min altogether.
Preferably, described step 4) temperature of slab is 1030 DEG C～1050 DEG C after de-scaling.
Preferably, described step 5) middle rolling 5～6 passages, the reduction ratio of the first passage and the second passage is 6%～8%,
3rd passage and accumulative reduction ratio >=40% of four-pass, the rolling temperature of most end passage is 980 DEG C～1000 DEG C, in gained
Between base thickness be 80mm～120mm.
Preferably, described step 6) cool down middle base to 885 DEG C～900 DEG C.
Preferably, described step 7) in rolling 8～12 passages, the reduction ratio of the first passage to four-pass is 14%～
18%, reduction ratio >=20% of the 5th passage, the accumulative reduction ratio of remaining passage is 35%～39%, the reduction ratio of most end passage
For 8%～10%, the thickness of gained pipe line steel is 26.97mm～31.75mm.
Preferably, described step 9) in tempering rear line steel be organized as granular bainite and ferrite.
Preferably, described step 4) with step 6) in water with pressure pressure be 19mpa～23mpa.
Compared with prior art, the present invention passes through the chemical composition system of appropriate design pipe line steel, using two benches low temperature
Big press control rolling and Controlled cooling process, control start rolling temperature, finishing temperature, open cold temperature, final cooling temperature and cooling speed
The technological parameters such as degree, obtain a kind of granular bainite and ferritic line and staff control, this tissue crystal grain is tiny, have good low
Warm toughness, it is achieved thereby that big wall thickness, the production in enormous quantities of Hi-grade steel pipe line steel, ensure that the pipe line steel of output has relatively simultaneously
High obdurability, and production cost is relatively low.
Brief description
Fig. 1 is 26.97mm specification x65m steel plate thickness direction provided in an embodiment of the present invention surface metallographic structure figure；
Fig. 2 is the metallographic structure figure at 26.97mm specification x65m steel plate thickness direction 1/4 provided in an embodiment of the present invention；
Fig. 3 is the metallographic structure figure at 26.97mm specification x65m steel plate thickness direction 1/2 provided in an embodiment of the present invention；
Fig. 4 is 31.75mm specification x65m steel plate thickness direction provided in an embodiment of the present invention surface metallographic structure figure；
Fig. 5 is the metallographic structure figure at 31.75mm specification x65m steel plate thickness direction 1/4 provided in an embodiment of the present invention；
Fig. 6 is the metallographic structure figure at 31.75mm specification x65m steel plate thickness direction 1/2 provided in an embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of not making creative work, broadly falls into the scope of protection of the invention.
The invention provides a kind of production method of x65m pipe line steel, comprise the following steps:
1) smelt: molten iron is utilized clean steel production technology output molten steel, gained molten steel includes following percentage by weight
Chemical composition: c:0.03%～0.08%, si:0.15%～0.35%, mn:1.10%～1.60%, p:0～0.012%, s:
0～0.003%, nb:0.02%～0.06%, ti:0.015%～0.025%, mo:0～0.25%, cu:0～0.35%,
Ni:0～0.30%, cr:0～0.20%, al:0.015%～0.050%, remaining is fe and inevitable impurity, o in steel,
The total weight percent of n, h, p and s is 0～0.015%；
2) continuous casting steel billet: by step 1) gained molten steel adopt dynamic soft reduction technology continuous casting output slab, gained slab
Center segregation reaches c class below 1.5, then slow cooling；
3) heating: by step 2) gained slab is heated to 1100 DEG C～1220 DEG C；
4) dephosphorization: by step 3) gained slab utilize water dephosphorization with pressure；
5) recrystallization zone controlled rolling: by step 4) gained slab carries out base in the middle of recrystallization zone controlled rolling output, then
During crystal region controlled rolling, the temperature range of slab is 1050 DEG C～980 DEG C, and most end percentage pass reduction is 18%～23%,
Accumulation reduction ratio is 50%-70%；
6) cooling down: by step 5) base utilizes water cooling with pressure in the middle of gained；
7) Unhydrated cement controlled rolling: by step 6) base carries out Unhydrated cement controlled rolling output pipeline in the middle of gained
Steel, during Unhydrated cement controlled rolling, the temperature of middle base is 800 DEG C～900 DEG C, and the rolling temperature of most end passage is 780
DEG C～820 DEG C, accumulation reduction ratio is 65%～75%, and the thickness of gained pipe line steel is 26.97mm～31.75mm；
8) controlling cooling: by step 7) gained pipe line steel is controlled cooling down, and opens 730 DEG C～790 DEG C of cold temperature, eventually cold temperature
300 DEG C～500 DEG C of degree, 15 DEG C/s～25 DEG C of cooldown rate/s；
9) it is tempered: by step 8) gained Pipeline Steel Plate carries out nature tempering using the method for stacking slow cooling, removes internal stress.
The present invention by the chemical composition system of appropriate design pipe line steel, using the rolling of two benches low temperature big press control and
Controlled cooling process, controls start rolling temperature, finishing temperature, opens the technological parameters such as cold temperature, final cooling temperature and cooling velocity, obtain
A kind of granular bainite and ferritic line and staff control, this tissue crystal grain is tiny, has good low-temperature flexibility, it is achieved thereby that
Big wall thickness, the production in enormous quantities of Hi-grade steel pipe line steel, ensure that the pipe line steel of output has higher obdurability simultaneously, and produce
Cost is relatively low.
It is that molten iron is remaining by ni element in the molten steel composition of clean steel production technology output.
Molten steel adopts dynamic soft reduction technology continuous casting output slab it is preferred that slab thickness is 250mm～300mm.Then
Slow cooling, temperature retention time is preferably 48h～72h.
During to above-mentioned heating of plate blank, it is divided into bringing-up section and two subprocess of soaking zone it is preferred that bringing-up section and all
The temperature of hot arc is 1100 DEG C～1220 DEG C, and soaking zone temperature retention time is preferably 30min～40min, and heating process is carried out altogether
250min～300min.Due to element containing niobium titanium alloy in slab, if relation reheating temperature, more than 1220 DEG C, will make austenite
Crystal grain is grown up seriously, and tissue is serious to be roughened, unfavorable to the intensity and toughness of steel plate, and heating-up temperature is high, wastes the energy, increases
Production cost.
Water dephosphorization with pressure is utilized to the slab after above-mentioned heating, water pressure with pressure is preferably 19mpa～23mpa, after de-scaling
The temperature of slab is preferably 1030 DEG C～1050 DEG C.
After dephosphorization, start slab to be controlled roll.Controlled rolling is divided into two stages: recrystallization zone controlled rolling and
Unhydrated cement controlled rolling.Carry out recrystallization zone controlled rolling first, preferably roll 5～6 passages, the first passage and second
The reduction ratio of passage is 6%～8%, accumulative reduction ratio >=40% of the 3rd passage and four-pass, the rolling temperature of most end passage
Spend for 980 DEG C～1000 DEG C, gained workpiece thickness is 80mm～120mm.
Water cooling with pressure is utilized to the middle base after the controlled rolling of above-mentioned recrystallization zone, water pressure with pressure is preferably 19mpa
～23mpa, is preferably cooled to 885 DEG C～900 DEG C, reduces the crystal grain after recrystallization deformation and grows up.
Then, start to carry out Unhydrated cement controlled rolling to middle base, preferably roll 8～12 passages, the first passage
Reduction ratio to four-pass is 14%～18%, reduction ratio >=20% of the 5th passage, and the accumulative reduction ratio of remaining passage is
35%～39%, the reduction ratio of most end passage is 8%～10%.
Control in cooling and can adopt mulpic cooling device, simultaneously using water Crown control, end to end and edge part shading is cold
But technology ensures the uniformity of cooling.
Be tempered rear line steel is organized as granular bainite and ferrite.
For a further understanding of the present invention, a kind of production of the x65m pipe line steel present invention being provided with reference to embodiment
Method is described in detail.
Embodiment 1:
1) smelt: molten iron is utilized clean steel production technology output molten steel, gained molten steel includes following percentage by weight
Chemical composition: c:0.06%, si:0.25%, mn:1.3%, p:0.009%, s:0.001%, nb:0.03%, ti:
0.018%, mo:0.12%, cu:0.05%, ni:0.08%, cr:0.09%, al:0.035%, n:0.0028%, h:
0.0001%, o:0.0016%, remaining is fe and inevitable impurity.
2) continuous casting steel billet: using dynamic soft reduction technology continuous casting step 1) gained molten steel output slab, gained slab thickness
For 250mm, slow cooling 48h, the center segregation of slab reaches c class 1.5.
3) heating: by step 2) gained slab is heated to 1100 DEG C～1200 DEG C, the wherein temperature of bringing-up section and soaking zone
All control at 1180 DEG C, soaking zone temperature retention time is 35min, step 3) carry out 250min altogether.
4) dephosphorization: by step 3) the water dephosphorization with pressure for 21mpa using pressure of gained slab, after de-scaling, the temperature of slab is
1040℃.
5) recrystallization zone controlled rolling: by step 4) gained slab carries out base in the middle of recrystallization zone controlled rolling output, then
During crystal region controlled rolling, the temperature range of slab is 1040 DEG C～990 DEG C, rolls 5 passages, the rolling temperature of most end passage
Spend for 990 DEG C, reduction ratio is 22.8%, accumulation reduction ratio is 58%, gained workpiece thickness is 105mm；Wherein, the first passage
Reduction ratio be 8%, the reduction ratio of the second passage is 8%, and the accumulative reduction ratio of the 3rd passage and four-pass is 40.5%, the
Five percentage pass reductions are 22%, and the rolling temperature of the first passage is 1040 DEG C, and the rolling temperature of most end passage is 998 DEG C.
6) cooling down: by step 5) base is water-cooled to 890 DEG C using with pressure for 21mpa of pressure in the middle of gained.
7) Unhydrated cement controlled rolling: by step 6) base carries out Unhydrated cement controlled rolling output pipeline in the middle of gained
Steel, during Unhydrated cement controlled rolling in the middle of the temperature of base be 800 DEG C～880 DEG C, roll 9 passages, the rolling of most end passage
Temperature processed is 810 DEG C, and reduction ratio is 10%, and accumulation reduction ratio is 75%, and wherein, the reduction ratio of the first passage to four-pass is
14%～18%, the reduction ratio of the 5th passage is 21%, and the accumulative reduction ratio of remaining passage is 38%, the rolling temperature of the first passage
Spend for 815 DEG C, the rolling temperature of most end passage is 810 DEG C, the thickness of gained pipe line steel is 26.97mm.
8) controlling cooling: by step 7) gained pipe line steel is controlled cooling down, and opens 750 DEG C of cold temperature, final cooling temperature 450
DEG C, 23 DEG C/s of cooldown rate；
9) it is tempered: by step 8) gained Pipeline Steel Plate carries out nature tempering using the method for stacking slow cooling, removes internal stress.
After testing, the mechanical property of the 26.97mm specification x65m pipe line steel that embodiment 1 provides is as shown in table 1；Embodiment 1
The 26.97mm specification x65m steel plate thickness direction surface metallographic structure figure providing is as shown in Figure 1；The 26.97mm that embodiment 1 provides
Metallographic structure figure at specification x65m steel plate thickness direction 1/4 is as shown in Figure 2；The 26.97mm specification x65m steel that embodiment 1 provides
Metallographic structure figure at plate thickness direction 1/2 is as shown in Figure 3.
Embodiment 2:
1) smelt: molten iron is utilized clean steel production technology output molten steel, gained molten steel includes following percentage by weight
Chemical composition: c:0.06%, si:0.21%, mn:1.5%, p:0.008%, s:0.002%, nb:0.04%, ti:
0.016%, mo:0.13%, cu:0.06%, ni:0.08%, cr:0.1%, al:0.028%, n:0.0030%, h:
0.00015%, o:0.0016%, remaining is fe and inevitable impurity.
2) continuous casting steel billet: using dynamic soft reduction technology continuous casting step 1) gained molten steel output slab, gained slab thickness
For 250mm, slow cooling 52h, the center segregation of slab reaches c class 1.5.
3) heating: by step 2) gained slab is heated to 1100 DEG C～1200 DEG C, the wherein temperature of bringing-up section and soaking zone
All control at 1190 DEG C, soaking zone temperature retention time is 38min, step 3) carry out 260min altogether.
4) dephosphorization: by step 3) the water dephosphorization with pressure for 21mpa using pressure of gained slab, after de-scaling, the temperature of slab is
1042℃.
5) recrystallization zone controlled rolling: by step 4) gained slab carries out base in the middle of recrystallization zone controlled rolling output, then
During crystal region controlled rolling, the temperature range of slab is 1042 DEG C～980 DEG C, rolls 5 passages, the rolling temperature of most end passage
Spend for 999 DEG C, reduction ratio is 23%, accumulation reduction ratio is 56.8%, gained workpiece thickness is 108mm；Wherein, the first passage
Reduction ratio be 7.8%, the reduction ratio of the second passage is 8.1%, and the accumulative reduction ratio of the 3rd passage and four-pass is
40.5%, the 5th percentage pass reduction is 21.2%, and the rolling temperature of the first passage is 1045 DEG C, and the rolling temperature of most end passage is
998℃
6) cooling down: by step 5) base is water-cooled to 886 DEG C using with pressure for 21mpa of pressure in the middle of gained.
7) Unhydrated cement controlled rolling: by step 6) base carries out Unhydrated cement controlled rolling output pipeline in the middle of gained
Steel, during Unhydrated cement controlled rolling in the middle of the temperature of base be 800 DEG C～880 DEG C, roll 8 passages, the rolling of most end passage
Temperature processed is 815 DEG C, and reduction ratio is 9%, and accumulation reduction ratio is 69.8%, and the reduction ratio of the first passage to four-pass is 14%
～18%, the reduction ratio of the 5th passage is 21%, and the accumulative reduction ratio of remaining passage is 38%, and the rolling temperature of the first passage is
810 DEG C, the rolling temperature of most end passage is 815 DEG C, and the thickness of gained pipe line steel is 31.75mm.
8) controlling cooling: by step 7) gained pipe line steel is controlled cooling down, and opens 748 DEG C of cold temperature, final cooling temperature 420
DEG C, 22 DEG C/s of cooldown rate；
9) it is tempered: by step 8) gained Pipeline Steel Plate carries out nature tempering using the method for stacking slow cooling, removes internal stress.
After testing, the mechanical property of the 31.75mm specification x65m pipe line steel that embodiment 2 provides is as shown in table 1；Embodiment 2
The 31.75mm specification x65m steel plate thickness direction surface metallographic structure figure providing is as shown in Figure 4；The 31.75mm that embodiment 2 provides
Metallographic structure figure at specification x65m steel plate thickness direction 1/4 is as shown in Figure 5；The 31.75mm specification x65m steel that embodiment 2 provides
Metallographic structure figure at plate thickness direction 1/2 is as shown in Figure 6.
The horizontal Main Mechanical detection statistics table of each embodiment of table 1
There is provided a kind of being described in detail of production method of x65m pipe line steel to the present invention above.Used herein
Specific embodiment is set forth to the principle of the present invention and embodiment, and the explanation of above example is only intended to help understand
The method of the present invention and its core concept.It should be pointed out that for those skilled in the art, without departing from this
On the premise of inventive principle, the present invention can also be carried out with some improvement and modify, these improve and modification also falls into the present invention
In scope of the claims.
Claims (1)
1. a kind of production method of x65m pipe line steel is it is characterised in that comprise the following steps:
1) smelt: molten iron is utilized clean steel production technology output molten steel, gained molten steel includes the chemistry of following percentage by weight
Composition: c:0.03%～0.08%, si:0.15%～0.35%, mn:1.10%～1.60%, p:0～0.012%, s:0～
0.003%, nb:0.02%～0.06%, ti:0.015%～0.025%, mo:0.12%～0.25%, cu:0.05%～
0.35%, ni:0.08%～0.30%, cr:0～0.20%, al:0.015%～0.050%, remaining is fe and inevitable
Impurity, in steel the total weight percent of o, n, h, p and s be 0～0.015%；
Described step 1) in molten steel composition ni element be that molten iron is remaining；
2) continuous casting steel billet: by step 1) gained molten steel adopt dynamic soft reduction technology continuous casting output slab, the center of gained slab
Segregation reaches c class below 1.5, then slow cooling；
Described step 2) in slab thickness be 250mm～300mm, temperature retention time be 48h～72h；
3) heating: by step 2) gained slab is heated to 1100 DEG C～1220 DEG C；
Described step 3) in heating process be divided into bringing-up section and soaking zone, the two temperature is 1100 DEG C～1220 DEG C, described all
Hot arc temperature retention time is 30min～40min, described step 3) carry out 250min～300min altogether；
4) de-scaling: by step 3) gained slab utilize water de-scaling with pressure；
Described step 4) temperature of slab is 1030 DEG C～1050 DEG C after de-scaling；
Described step 4) in water with pressure pressure be 19mpa～23mpa；
5) recrystallization zone controlled rolling: by step 4) gained slab carries out base in the middle of recrystallization zone controlled rolling output, recrystallization
During area's controlled rolling, the temperature range of slab is 1050 DEG C～980 DEG C, and most end percentage pass reduction is 18%～23%, accumulation
Reduction ratio is 50%-70%；
Described step 5) in rolling 5～6 passages, the reduction ratio of the first passage and the second passage is 6%～8%, the 3rd passage and
Accumulative reduction ratio >=40% of four-pass, the rolling temperature of most end passage is 980 DEG C～1000 DEG C, and gained workpiece thickness is
80mm～120mm；
6) cooling down: by step 5) base utilizes water cooling with pressure in the middle of gained；
Described step 6) cool down middle base to 885 DEG C～900 DEG C；
Described step 6) in water with pressure pressure be 19mpa～23mpa；
7) Unhydrated cement controlled rolling: by step 6) base carries out Unhydrated cement controlled rolling output pipe line steel in the middle of gained,
In the middle of during Unhydrated cement controlled rolling, the temperature of base is 800 DEG C～900 DEG C, and the rolling temperature of most end passage is 780 DEG C
～820 DEG C, accumulation reduction ratio is 65%～75%, and the thickness of gained pipe line steel is 26.97mm～31.75mm；
Described step 7) middle rolling 8～12 passages, the reduction ratio of the first passage to four-pass is 14%～18%, the 5th passage
Reduction ratio >=20%, the accumulative reduction ratio of remaining passage is 35%～39%, and the reduction ratio of most end passage is 8%～10%；
8) controlling cooling: by step 7) gained pipe line steel is controlled cooling down, and opens 730 DEG C～790 DEG C of cold temperature, final cooling temperature
300 DEG C～500 DEG C, 15 DEG C/s～25 DEG C of cooldown rate/s；
9) it is tempered: by step 8) gained Pipeline Steel Plate carries out nature tempering using the method for stacking slow cooling, removes internal stress；
Described step 9) in tempering rear line steel be organized as granular bainite and ferrite.
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| MX2018015659A (en) * | 2016-06-22 | 2019-03-14 | Jfe Steel Corp | Hot-rolled steel sheet for thick high strength line pipes, welded steel pipe for thick high strength line pipes, and manfuacturing method therefor. |
| CN108265225A (en) * | 2018-03-21 | 2018-07-10 | 包头钢铁（集团）有限责任公司 | A kind of acid-resisting corrosion X65MS pipe line steels and preparation method thereof |
| CN108411194A (en) * | 2018-03-21 | 2018-08-17 | 包头钢铁（集团）有限责任公司 | A kind of acid-resisting corrosion X60MS pipe line steels and preparation method thereof |
| CN110484819A (en) * | 2019-09-05 | 2019-11-22 | 首钢集团有限公司 | A kind of oily pipe line steel and preparation method thereof |
| CN110846565A (en) * | 2019-09-30 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | Low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance and production method thereof |
| CN111534741A (en) * | 2020-04-29 | 2020-08-14 | 鞍钢股份有限公司 | Method for rolling steel X56Mo for submarine pipeline |
| CN112226699B (en) * | 2020-10-28 | 2022-03-01 | 湖南华菱湘潭钢铁有限公司 | Production method of acid-resistant pipeline steel |
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