CN104694844A - Production method of X65M pipeline steel - Google Patents
Production method of X65M pipeline steel Download PDFInfo
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- CN104694844A CN104694844A CN201510141936.0A CN201510141936A CN104694844A CN 104694844 A CN104694844 A CN 104694844A CN 201510141936 A CN201510141936 A CN 201510141936A CN 104694844 A CN104694844 A CN 104694844A
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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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
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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 production method thereof.
Background technology
In recent years along with the fast development of oil, gas industry, for improving transport efficiency and security further, long distance delivery pipeline pipe line steel used forward Hi-grade steel, large wall thickness, bigbore future development.
Meanwhile, the requirement of long distance delivery pipeline to the obdurability of pipe line steel is also more and more higher.
At present, supply exceed demand for domestic steel, and market competition is abnormal miserable, and the production cost reducing pipe line steel improves the most effective approach of pipe line steel product competitiveness in the market.
Therefore, how to provide a kind of production method of pipe line steel, while can producing large wall thickness, Hi-grade steel pipe line steel, ensure that the pipe line steel of output has higher obdurability, and the lower those skilled in the art of being of production cost need the technical problem of solution badly.
Summary of the invention
In view of this, an object of the present invention is to provide a kind of production method of X65M pipe line steel, this production method can produce the pipe line steel of large wall thickness, Hi-grade steel, ensure that the pipe line steel of output has higher obdurability, and production cost is lower simultaneously.
For solving above-mentioned technical problem, technical scheme provided by the invention is:
A production method for X65M pipe line steel, comprises the following steps:
1) smelt: molten iron is utilized Clean Steel production technique output molten steel, gained molten steel comprises the chemical composition of following weight percent: 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%, all the other are Fe and inevitable impurity, O in steel, N, H, the total weight percent of P and S is 0 ~ 0.015%,
2) continuous casting steel billet: by step 1) gained molten steel employing dynamic soft reduction technology continuous casting output slab, the center segregation of gained slab reaches C class less than 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) dephosphorization of gained slab utilization band setting-out;
5) recrystallization zone controlled rolling: by step 4) gained slab carries out recrystallization zone controlled rolling output intermediate blank, in recrystallization zone controlled rolling process, the temperature range of slab is 1050 DEG C ~ 980 DEG C, most end percentage pass reduction is 18% ~ 23%, and accumulation draft is 50%-70%;
6) cooling: by step 5) gained intermediate blank utilizes water cooling with pressure;
7) Unhydrated cement controlled rolling: by step 6) gained intermediate blank carries out Unhydrated cement controlled rolling output pipe line steel, in Unhydrated cement controlled rolling process, the temperature of intermediate blank is 800 DEG C ~ 900 DEG C, the rolling temperature of most end passage is 780 DEG C ~ 820 DEG C, accumulation draft is 65% ~ 75%, and the thickness of gained pipe line steel is 26.97mm ~ 31.75mm.
8) controlled cooling model: by step 7) gained pipe line steel carries out controlled cooling model, opens cold temperature 730 DEG C ~ 790 DEG C, final cooling temperature 300 DEG C ~ 500 DEG C, rate of cooling 15 DEG C/s ~ 25 DEG C/s;
9) tempering: by step 8) gained Pipeline Steel Plate utilizes the method for stacking slow cooling to carry out nature tempering, 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, the slow cooling time is 48h ~ 72h.
Preferably, described step 3) in the temperature of heating zone and soaking zone be 1100 DEG C ~ 1220 DEG C, described soaking zone soaking 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 passage, the draft of the first passage and the second passage is accumulative draft >=40% of the 6% ~ 8%, three passage and four-pass, the rolling temperature of most end passage is 980 DEG C ~ 1000 DEG C, and gained workpiece thickness is 80mm ~ 120mm.
Preferably, described step 6) cooling intermediate blank to 885 DEG C ~ 900 DEG C.
Preferably, described step 7) middle rolling 8 ~ 12 passage, first passage is 14% ~ 18% to the draft of four-pass, draft >=20% of the 5th passage, the accumulative draft of all the other passages is 35% ~ 39%, the draft of most end passage is 8% ~ 10%, and 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 be with the pressure of setting-out to be 19MPa ~ 23MPa.
Compared with prior art, the present invention is by the chemical composition system of appropriate design pipe line steel, adopt the large press control rolling of two benches low temperature and Controlled cooling process, control start rolling temperature, finishing temperature, open the processing parameters such as cold temperature, final cooling temperature and speed of cooling, obtain a kind of granular bainite and ferritic mixed structure, this tissue crystal grain is tiny, there is good low-temperature flexibility, thus achieve the production in enormous quantities of large wall thickness, Hi-grade steel pipe line steel, ensure that the pipe line steel of output has higher obdurability, and production cost is lower simultaneously.
Accompanying drawing explanation
The 26.97mm specification X65M steel plate thickness direction surface metallographic structure figure that Fig. 1 provides for the embodiment of the present invention;
The metallographic structure figure at 26.97mm specification X65M steel plate thickness direction 1/4 place that Fig. 2 provides for the embodiment of the present invention;
The metallographic structure figure at 26.97mm specification X65M steel plate thickness direction 1/2 place that Fig. 3 provides for the embodiment of the present invention;
The 31.75mm specification X65M steel plate thickness direction surface metallographic structure figure that Fig. 4 provides for the embodiment of the present invention;
The metallographic structure figure at 31.75mm specification X65M steel plate thickness direction 1/4 place that Fig. 5 provides for the embodiment of the present invention;
The metallographic structure figure at 31.75mm specification X65M steel plate thickness direction 1/2 place that Fig. 6 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to 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 technique output molten steel, gained molten steel comprises the chemical composition of following weight percent: 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%, all the other are Fe and inevitable impurity, O in steel, N, H, the total weight percent of P and S is 0 ~ 0.015%,
2) continuous casting steel billet: by step 1) gained molten steel employing dynamic soft reduction technology continuous casting output slab, the center segregation of gained slab reaches C class less than 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) dephosphorization of gained slab utilization band setting-out;
5) recrystallization zone controlled rolling: by step 4) gained slab carries out recrystallization zone controlled rolling output intermediate blank, in recrystallization zone controlled rolling process, the temperature range of slab is 1050 DEG C ~ 980 DEG C, most end percentage pass reduction is 18% ~ 23%, and accumulation draft is 50%-70%;
6) cooling: by step 5) gained intermediate blank utilizes water cooling with pressure;
7) Unhydrated cement controlled rolling: by step 6) gained intermediate blank carries out Unhydrated cement controlled rolling output pipe line steel, in Unhydrated cement controlled rolling process, the temperature of intermediate blank is 800 DEG C ~ 900 DEG C, the rolling temperature of most end passage is 780 DEG C ~ 820 DEG C, accumulation draft is 65% ~ 75%, and the thickness of gained pipe line steel is 26.97mm ~ 31.75mm;
8) controlled cooling model: by step 7) gained pipe line steel carries out controlled cooling model, opens cold temperature 730 DEG C ~ 790 DEG C, final cooling temperature 300 DEG C ~ 500 DEG C, rate of cooling 15 DEG C/s ~ 25 DEG C/s;
9) tempering: by step 8) gained Pipeline Steel Plate utilizes the method for stacking slow cooling to carry out nature tempering, removes internal stress.
The present invention is by the chemical composition system of appropriate design pipe line steel, adopt the large press control rolling of two benches low temperature and Controlled cooling process, control start rolling temperature, finishing temperature, open the processing parameters such as cold temperature, final cooling temperature and speed of cooling, obtain a kind of granular bainite and ferritic mixed structure, this tissue crystal grain is tiny, there is good low-temperature flexibility, thus achieve the production in enormous quantities of large wall thickness, Hi-grade steel pipe line steel, ensure that the pipe line steel of output has higher obdurability, and production cost is lower simultaneously.
Be that molten iron is remaining by Ni element in the molten steel composition of Clean Steel production technique output.
Molten steel adopts dynamic soft reduction technology continuous casting output slab, and preferably, slab thickness is 250mm ~ 300mm.Then slow cooling, the slow cooling time is preferably 48h ~ 72h.
To in above-mentioned heating of plate blank process, be divided into heating zone and soaking zone two subprocess, preferably, the temperature of heating zone and soaking zone is 1100 DEG C ~ 1220 DEG C, soaking zone soaking time is preferably 30min ~ 40min, and heat-processed carries out 250min ~ 300min altogether.Due in slab containing niobium titanium alloy element, if reheat temperature more than 1220 DEG C, Austenite Grain Growth will be made serious, organize serious alligatoring, to the intensity of steel plate and toughness unfavorable, and Heating temperature is high, wastes energy, and increases production cost.
Utilize the dephosphorization of band setting-out to the slab after above-mentioned heating, water pressure with pressure is preferably 19MPa ~ 23MPa, and after de-scaling, the temperature of slab is preferably 1030 DEG C ~ 1050 DEG C.
After dephosphorization, start to carry out controlled rolling to slab.Controlled rolling is divided into two stages: recrystallization zone controlled rolling and Unhydrated cement controlled rolling.First recrystallization zone controlled rolling is carried out, preferred rolling 5 ~ 6 passage, the draft of the first passage and the second passage is 6% ~ 8%, accumulative draft >=40% of the 3rd passage and four-pass, the rolling temperature of most end passage is 980 DEG C ~ 1000 DEG C, and gained workpiece thickness is 80mm ~ 120mm.
Utilize water cooling with pressure to the intermediate blank 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 grain growth after recrystallize distortion.
Then, start to carry out Unhydrated cement controlled rolling to intermediate blank, preferred rolling 8 ~ 12 passage, first passage is 14% ~ 18% to the draft of four-pass, draft >=20% of the 5th passage, the accumulative draft of all the other passages is 35% ~ 39%, and the draft of most end passage is 8% ~ 10%.
MULPIC cooling apparatus can be adopted in controlled cooling model, adopt water Crown control simultaneously, end to end and edge part shading cooling technology ensure the homogeneity of cooling.
Tempering rear line steel be organized as granular bainite and ferrite.
In order to understand the present invention further, be described in detail below in conjunction with the production method of embodiment to a kind of X65M pipe line steel provided by the invention.
Embodiment 1:
1) smelt: molten iron is utilized Clean Steel production technique output molten steel, gained molten steel comprises the chemical composition of following weight percent: 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%, all the other are Fe and inevitable impurity.
2) continuous casting steel billet: adopt dynamic soft reduction technology continuous casting step 1) gained molten steel output slab, gained slab thickness is 250mm, slow cooling 48h, and 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, wherein the temperature of heating zone and soaking zone all controls at 1180 DEG C, and soaking zone soaking time is 35min, step 3) carry out 250min altogether.
4) dephosphorization: by step 3) band setting-out dephosphorization that gained slab utilizes pressure to be 21MPa, after de-scaling, the temperature of slab is 1040 DEG C.
5) recrystallization zone controlled rolling: by step 4) gained slab carries out recrystallization zone controlled rolling output intermediate blank, in recrystallization zone controlled rolling process, the temperature range of slab is 1040 DEG C ~ 990 DEG C, rolling 5 passage, the rolling temperature of most end passage is 990 DEG C, draft is 22.8%, accumulation draft is 58%, and gained workpiece thickness is 105mm; Wherein, the draft of the first passage is the draft of the 8%, second passage is 8%, the accumulative draft of the 3rd passage and four-pass is 40.5%, 5th percentage pass reduction is the rolling temperature of the 22%, first passage is 1040 DEG C, and the rolling temperature of most end passage is 998 DEG C.
6) cool: by step 5) gained intermediate blank utilize pressure to be 21MPa be with pressurely water-cooled to 890 DEG C.
7) Unhydrated cement controlled rolling: by step 6) gained intermediate blank carries out Unhydrated cement controlled rolling output pipe line steel, in Unhydrated cement controlled rolling process, the temperature of intermediate blank is 800 DEG C ~ 880 DEG C, rolling 9 passage, the rolling temperature of most end passage is 810 DEG C, draft is 10%, accumulation draft is 75%, wherein, first passage is 14% ~ 18% to the draft of four-pass, the draft of the 5th passage is 21%, the accumulative draft of all the other passages is 38%, the rolling temperature of the first passage is 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) controlled cooling model: by step 7) gained pipe line steel carries out controlled cooling model, opens cold temperature 750 DEG C, final cooling temperature 450 DEG C, rate of cooling 23 DEG C/s;
9) tempering: by step 8) gained Pipeline Steel Plate utilizes the method for stacking slow cooling to carry out nature tempering, removes internal stress.
After testing, the mechanical property of 26.97mm specification X65M pipe line steel that provides of embodiment 1 is as shown in table 1; The 26.97mm specification X65M steel plate thickness direction surface metallographic structure figure that embodiment 1 provides as shown in Figure 1; The metallographic structure figure at 26.97mm specification X65M steel plate thickness direction 1/4 place that embodiment 1 provides as shown in Figure 2; The metallographic structure figure at 26.97mm specification X65M steel plate thickness direction 1/2 place that embodiment 1 provides as shown in Figure 3.
Embodiment 2:
1) smelt: molten iron is utilized Clean Steel production technique output molten steel, gained molten steel comprises the chemical composition of following weight percent: 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%, all the other are Fe and inevitable impurity.
2) continuous casting steel billet: adopt dynamic soft reduction technology continuous casting step 1) gained molten steel output slab, gained slab thickness is 250mm, slow cooling 52h, and 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, wherein the temperature of heating zone and soaking zone all controls at 1190 DEG C, and soaking zone soaking time is 38min, step 3) carry out 260min altogether.
4) dephosphorization: by step 3) band setting-out dephosphorization that gained slab utilizes pressure to be 21MPa, after de-scaling, the temperature of slab is 1042 DEG C.
5) recrystallization zone controlled rolling: by step 4) gained slab carries out recrystallization zone controlled rolling output intermediate blank, in recrystallization zone controlled rolling process, the temperature range of slab is 1042 DEG C ~ 980 DEG C, rolling 5 passage, the rolling temperature of most end passage is 999 DEG C, draft is 23%, accumulation draft is 56.8%, and gained workpiece thickness is 108mm; Wherein, the draft of the first passage is the draft of the 7.8%, second passage is 8.1%, the accumulative draft of the 3rd passage and four-pass is 40.5%, 5th percentage pass reduction is the rolling temperature of the 21.2%, first passage is 1045 DEG C, and the rolling temperature of most end passage is 998 DEG C
6) cool: by step 5) gained intermediate blank utilize pressure to be 21MPa be with pressurely water-cooled to 886 DEG C.
7) Unhydrated cement controlled rolling: by step 6) gained intermediate blank carries out Unhydrated cement controlled rolling output pipe line steel, in Unhydrated cement controlled rolling process, the temperature of intermediate blank is 800 DEG C ~ 880 DEG C, rolling 8 passage, the rolling temperature of most end passage is 815 DEG C, draft is 9%, accumulation draft is 69.8%, first passage is 14% ~ 18% to the draft of four-pass, the draft of the 5th passage is 21%, the accumulative draft of all the other passages is 38%, the rolling temperature of the first passage is 810 DEG C, the rolling temperature of most end passage is 815 DEG C, the thickness of gained pipe line steel is 31.75mm.
8) controlled cooling model: by step 7) gained pipe line steel carries out controlled cooling model, opens cold temperature 748 DEG C, final cooling temperature 420 DEG C, rate of cooling 22 DEG C/s;
9) tempering: by step 8) gained Pipeline Steel Plate utilizes the method for stacking slow cooling to carry out nature tempering, removes internal stress.
After testing, the mechanical property of 31.75mm specification X65M pipe line steel that provides of embodiment 2 is as shown in table 1; The 31.75mm specification X65M steel plate thickness direction surface metallographic structure figure that embodiment 2 provides as shown in Figure 4; The metallographic structure figure at 31.75mm specification X65M steel plate thickness direction 1/4 place that embodiment 2 provides as shown in Figure 5; The metallographic structure figure at 31.75mm specification X65M steel plate thickness direction 1/2 place that embodiment 2 provides as shown in Figure 6.
The horizontal Main Mechanical detection statistics table of each embodiment of table 1
Above to being described in detail of production method that the invention provides a kind of X65M pipe line steel.Apply specific embodiment herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a production method for X65M pipe line steel, is characterized in that, comprises the following steps:
1) smelt: molten iron is utilized Clean Steel production technique output molten steel, gained molten steel comprises the chemical composition of following weight percent: 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%, all the other are Fe and inevitable impurity, O in steel, N, H, the total weight percent of P and S is 0 ~ 0.015%,
2) continuous casting steel billet: by step 1) gained molten steel employing dynamic soft reduction technology continuous casting output slab, the center segregation of gained slab reaches C class less than 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) dephosphorization of gained slab utilization band setting-out;
5) recrystallization zone controlled rolling: by step 4) gained slab carries out recrystallization zone controlled rolling output intermediate blank, in recrystallization zone controlled rolling process, the temperature range of slab is 1050 DEG C ~ 980 DEG C, most end percentage pass reduction is 18% ~ 23%, and accumulation draft is 50%-70%;
6) cooling: by step 5) gained intermediate blank utilizes water cooling with pressure;
7) Unhydrated cement controlled rolling: by step 6) gained intermediate blank carries out Unhydrated cement controlled rolling output pipe line steel, in Unhydrated cement controlled rolling process, the temperature of intermediate blank is 800 DEG C ~ 900 DEG C, the rolling temperature of most end passage is 780 DEG C ~ 820 DEG C, accumulation draft is 65% ~ 75%, and the thickness of gained pipe line steel is 26.97mm ~ 31.75mm;
8) controlled cooling model: by step 7) gained pipe line steel carries out controlled cooling model, opens cold temperature 730 DEG C ~ 790 DEG C, final cooling temperature 300 DEG C ~ 500 DEG C, rate of cooling 15 DEG C/s ~ 25 DEG C/s;
9) tempering: by step 8) gained Pipeline Steel Plate utilizes the method for stacking slow cooling to carry out nature tempering, removes internal stress.
2. the production method of X65M pipe line steel according to claim 1, is characterized in that, described step 1) in molten steel composition Ni element be that molten iron is remaining.
3. the production method of X65M pipe line steel according to claim 1, is characterized in that, described step 2) in slab thickness be 250mm ~ 300mm, the slow cooling time is 48h ~ 72h.
4. the production method of X65M pipe line steel according to claim 1, it is characterized in that, described step 3) in heat-processed be divided into heating zone and soaking zone, the two temperature is 1100 DEG C ~ 1220 DEG C, described soaking zone soaking time is 30min ~ 40min, described step 3) carry out 250min ~ 300min altogether.
5. the production method of X65M pipe line steel according to claim 1, is characterized in that, described step 4) temperature of slab is 1030 DEG C ~ 1050 DEG C after de-scaling.
6. the production method of X65M pipe line steel according to claim 1, it is characterized in that, described step 5) middle rolling 5 ~ 6 passage, the draft of the first passage and the second passage is 6% ~ 8%, accumulative draft >=40% of the 3rd passage and four-pass, the rolling temperature of most end passage is 980 DEG C ~ 1000 DEG C, and gained workpiece thickness is 80mm ~ 120mm.
7. the production method of X65M pipe line steel according to claim 1, is characterized in that, described step 6) cooling intermediate blank to 885 DEG C ~ 900 DEG C.
8. the production method of X65M pipe line steel according to claim 1, it is characterized in that, described step 7) middle rolling 8 ~ 12 passage, first passage is 14% ~ 18% to the draft of four-pass, draft >=20% of the 5th passage, the accumulative draft of all the other passages is 35% ~ 39%, and the draft of most end passage is 8% ~ 10%.
9. the production method of X65M pipe line steel according to claim 1, is characterized in that, described step 9) in tempering rear line steel be organized as granular bainite and ferrite.
10. the production method of X65M pipe line steel according to claim 1, is characterized in that, described step 4) with step 6) in be with the pressure of setting-out to be 19MPa ~ 23MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510141936.0A CN104694844B (en) | 2015-03-27 | 2015-03-27 | Production method of X65M pipeline steel |
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| CN105177423A (en) * | 2015-10-29 | 2015-12-23 | 山东钢铁股份有限公司 | Large-wall-thickness X65M pipeline steel plate and manufacturing method thereof |
| WO2017221690A1 (en) * | 2016-06-22 | 2017-12-28 | Ｊｆｅスチール株式会社 | 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 |
| CN112226699A (en) * | 2020-10-28 | 2021-01-15 | 湖南华菱湘潭钢铁有限公司 | Production method of acid-resistant pipeline steel |
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| CN105177423A (en) * | 2015-10-29 | 2015-12-23 | 山东钢铁股份有限公司 | Large-wall-thickness X65M pipeline steel plate and manufacturing method thereof |
| WO2017221690A1 (en) * | 2016-06-22 | 2017-12-28 | Ｊｆｅスチール株式会社 | Hot-rolled steel sheet for thick high strength line pipes, welded steel pipe for thick high strength line pipes, and manfuacturing method therefor |
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| 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 |
| CN112226699A (en) * | 2020-10-28 | 2021-01-15 | 湖南华菱湘潭钢铁有限公司 | Production method of acid-resistant pipeline steel |
| 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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