CN105803327B - The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance - Google Patents
The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance Download PDFInfo
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- CN105803327B CN105803327B CN201610314574.5A CN201610314574A CN105803327B CN 105803327 B CN105803327 B CN 105803327B CN 201610314574 A CN201610314574 A CN 201610314574A CN 105803327 B CN105803327 B CN 105803327B
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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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Abstract
The invention discloses the X90 Pipeline Steel Plates of economical hic resistance, the chemical composition of the steel plate is that the chemical composition of the steel plate is C by mass percentage by mass percentage：0.02~0.06%, Mn：1.7~1.90%, Si：0.15~0.35%, S：≤ 0.0005%, P：≤ 0.010%, Nb：0.04~0.07%, Ti：0.008~0.03%, V：≤ 0.10%, Al：≤ 0.06%, N：≤ 0.010%, O：≤ 0.006%, Mo：≤ 0.20%, Cu：≤ 0.20%, Ni：≤ 0.20%, Cr≤0.20%, Ca：0.0005~0.0015%, and Ca/S content ratio is 1.0~2.0, surplus is Fe and inevitable impurity element.Behavior law of the present invention according to hydrogen in the tissue, by refining+continuous casting+high temperature reheating+TMCP improved process, makes steel have the tissue of excellent Properties of HIC resistance and excellent low-temperature flexibility.
Description
Technical field
The invention belongs to X90 pipeline steel manufacturing technology fields, and in particular to economical hic resistance X90 pipeline steels
And its manufacture method.
Background technology
Fossil energy is also accounted in energy resource structure in the energy of world demand at present the principal status of public economy, in recent years World Economics
Rapidly increase the rapidly growth for greatly having driven fossil energy demand.The resource such as land and alkaline petroleum gas has been exploited up to a hundred
Year, face increasingly depleted.Therefore the mankind have gradually turned one's attention to acid petroleum gas region, and the characteristic in acid-soluble oil gas field is
Contain certain H in oil or natural gas2The sour gas such as S, cause to corrode to conveyance conduit, its forms of corrosion mainly has HIC
（Hydrogen induced cracking）And SSCC（Stress corrosion）Two ways, hic resistance and the highest grade of steel of anti-SSCC pipe line steels application are in X65 at present
Grade of steel.To reduce pipe-line construction cost, the developing direction of pipeline engineering is high intensity Large Diameter Pipeline, has started to carry out at present both at home and abroad
The test section of X90 grade of steel pipes laying, but X90 grade of steel hic resistance steel plates or steel pipe yet there are no and report for work.
The content of the invention
The technical problems to be solved by the invention are that a kind of X90 pipes of economical hic resistance are provided for above-mentioned prior art
Line steel plate and manufacture method, are designed using low-carbon, while add the micro alloying elements such as micro Nb, V, Ti, and are added a small amount of
The element such as Mo, Cu, Ni, according to the Behavior laws of H in the tissue, by refining+continuous casting+TMCP improved process, utilize tissue
Control technology, make steel that there is the tissue and performance of excellent Properties of HIC resistance.
Technical scheme is a kind of X90 pipe line steels of economical hic resistance used by the present invention solves above-mentioned technical problem
Plate, the chemical composition of the steel plate is C by mass percentage：0.02~0.06%, Mn：1.7~1.90%, Si：0.15~
0.35%, S：≤ 0.0005%, P：≤ 0.010%, Nb：0.04~0.07%, Ti：0.008~0.03%, V：≤ 0.10%, Al：≤
0.06%, N：≤ 0.010%, O：≤ 0.006%, Mo：≤ 0.20%, Cu：≤ 0.20%, Ni：≤ 0.20%, Cr≤
0.20%, Ca：0.0005~0.0015%, and Ca/S content ratio be 1.0~2.0, surplus be Fe and inevitably it is miscellaneous
Prime element.
Further, hic resistance steel plate most thickness specification of the invention is in 20mm.There is excellent high intensity high/low temperature simultaneously
Toughness, as yield tensile ratio is not higher than 0.83, -46 DEG C of low-temperature impacts are 300J or so；- 60 DEG C of low-temperature impacts are in 250J or so；-30℃
The section of shear drop hammer more than 85%, and obtains excellent Properties of HIC resistance..
What the chemical composition of steel plate of the present invention was related such that：
C：It is intensified element most economical, most basic in steel, steel can be significantly improved by solution strengthening and precipitation strength
Intensity, but toughness to steel and ductility and welding performance bring adverse effect, therefore the development trend of pipe line steel is constantly to drop
Low C content, HIC are very sensitive to C content in steel, it is contemplated that grade of steel of the present invention reaches X90, and passes through C and different microalloy elements
The relations such as solid solution and the precipitation of carbonitride are formed, therefore by C content control in steel 0.02~0.06%.
Mn：The intensity of steel is improved by solution strengthening, is to make up to cause loss of strength because C content reduces in pipe line steel
Most important element, Mn still expand the element of γ phase regions simultaneously, can reduce γ → α phase transition temperatures of steel, help to obtain carefully
Small phase-change product, the toughness of steel can be improved, but too high Mn contents can cause Mn to be segregated, in view of grade of steel has reached X90 ranks,
Certain Mn contents are necessary, therefore can only alleviate Mn segregations by subsequent heating process and rolling mill practice, therefore by Mn
Content is controlled 1.7~1.90%.
Nb：It is one of most important micro alloying element in modern micro alloyed steel particularly pipe line steel, to crystal grain refinement
Effect clearly.Pass through the Nb in Nb solid solution towing and course of hot rolling（C,N）Strain induced precipitate can hinder deformation difficult to understand
The recovery and recrystallization of family name's body, the deformed austeaite for rolling Unhydrated cement through TMCP are changed into tiny phase in phase transformation and sold of one's property
Thing, so that steel has high intensity and high tenacity, the present invention mainly determines Nb content models by the relation of C and Nb equal sizes
Enclose.
V：With higher precipitation strength and weaker Grain Refinement Effect, in tri- kinds of micro alloying elements of Nb, V, Ti
When compound on probation, main its precipitation strength effects of V.
Ti：It is strong solid N element, Ti/N stoichiometric proportion is 3.42, can be fixed using 0.02% or so Ti in steel
Below 60ppm N, can form TiN precipitated phases during sheet billet continuous casting, and this tiny precipitated phase can effectively prevent slab
Austenite crystal is grown up in heating process, is favorably improved solid solubility of the Nb in austenite, while can improve sweating heat
The impact flexibility of the zone of influence, it is indispensable element in pipe line steel.
Mo：The formation of ferritic phase is first separated out when can postpone γ → α phase transformations, the main member for promoting acicular ferrite to be formed
Element, control phase transformation is played an important role, while be also the quenching degree element for improving steel.It is cold in certain cooling velocity and end
At a temperature of by adding certain Mo can obtain obvious acicular ferrite or bainite structure.
S、P：It is inevitable impurity element in pipe line steel, it is desirable to it is more low better, changed by super-low sulfur and Ca processing
Oxide morphology, so as to improve the Properties of HIC resistance of steel.
Cu、Ni：The intensity of steel can be improved by solution strengthening, on the one hand Ni addition can improve the toughness of steel, separately simultaneously
Improve Cu easily caused red brittleness in steel.Cu addition can improve the intensity of steel, but under sour environment Cu to Properties of HIC resistance
It is limited.
Cr ：Cr addition can improve the quenching degree of steel, while certain Cr contents can improve Properties of HIC resistance.
It is a further object of the present invention to provide the manufacture method of the X90 Pipeline Steel Plates of above-mentioned economical hic resistance, concrete technology
Step is as follows：
Raw materials for metallurgy is pre-processed through KR molten iron successively first, converter smelting, LF refinings, RH vacuum refinings, refined
In journey control molten steel in S content≤0.0005%, then feed Ca-Si lines, control Ca/S in molten steel content ratio be 1.0~
2.0, then continuous casting go out to meet that chemical composition requirement, thickness are continuous casting billet not less than 350mm, the degree of superheat of molten steel is not during continuous casting
Higher than 15 DEG C；Continuous casting billet is again heated to 1280~1310 DEG C, insulation is not less than 8 hours；Two-phase control rolling is carried out after coming out of the stove：Always
Compression ratio is not less than 15（That is the ratio of sotck thinkness and finished product thickness）；Roll in two stages, the first stage rolls for recrystallization zone
System, for finishing temperature control at 1180~1210 DEG C, recrystallization zone controls the single pass reduction ratio of continuous two passage not low when rolling
In 28%；After first stage rolling terminates, middle base is cooled down using middle base appropriateness cooling system.Middle base cooling uses Mild
Cooling cooling systems（Middle base appropriateness cooling system）, after the completion of recrystallization zone rolling, middle base immediately enters centre
Base appropriateness cooling system, middle base is comparatively fast cooled to the second stage start rolling temperature of needs by appropriateness cooling.Middle base enters
After entering mild cooling systems, blank is moderately cooled down using the mode that swings back and forth in middle base appropriateness cooling system, is made cold
But speed control is in 9~13 DEG C/s.Second stage rolls for non-recrystallization zone, and start rolling temperature is not higher than 900 DEG C, until final
Thickness, finishing temperature control are not higher than 830 DEG C, and non-recrystallization zone adds up deformation rate and is not less than 60%；Then carried out by ACC cold
But, terminate chilling temperature and be not higher than 500 DEG C；Cooling velocity is 15~25 DEG C/s；Room temperature is cooled to afterwards produces steel plate finished product.
The present invention is moderately cooled down by base among being set between hot rolling first stage and second stage, this middle base cooling
Mode is that austenite crystal is no longer grown up after ensureing recrystallization zone rolling deformation, in big thickness steel plate course of hot rolling, in diminution
Between base surface and the center portion temperature difference.As shown in figure 3, middle base appropriateness cooling system is arranged on 4300mm wide and heavy plate mill production lines
Between roughing mill and finishing mill.The system is body structure, altogether long 18m, right in casing top, dense distribution spray spout
Middle base after roughing carries out appropriate cooling, and according to different workpiece thickness, middle the base cooling velocity of acquisition is 4~18 DEG C/
S, workpiece thickness is according to product and production needs, generally in the thick left and right of 40~180mm, it is thick less than 40mm among base due to compared with
It is thin, unless needed for being typically not required to carry out middle base cooling.For base among think gauge, it is contemplated that design limit, maximum cooling speed
Spend in 4 DEG C/s, for Thin Specs, maximum cooling velocity can reach 18 DEG C/s.Why higher cooling rate can not be used, have two because
Element needs to consider：One is due under higher cooling rate, and middle base through-thickness can produce larger temperature difference, this temperature difference
Cause Deformation in thickness uneven due to temperature difference in rolling, finish rolling can produce steel plate and upwarp or lower button when rolling, influence
Productivity ratio；Second, this through-thickness temperature difference will cause through-thickness region austenite deformation different, so as to shadow
Ring and obtain final tissue.
After the completion of blank rolls through the first stage, according to production needs, judge whether that opening middle base moderately cools down.For
Situation about moderately being cooled down using intermediate blank cooling system is needed, middle base after base appropriateness cooling system, is among entering
Corresponding roller-way enters weave mode in system, middle base is swung back and forth in system, while nozzle spray is sprayed water to middle base,
Base is cooled to the start rolling temperature of second stage rolling with specific cooling velocity among control.
After middle base is cooled to the start rolling temperature of second stage rolling, middle base will be out of middle base appropriateness cooling system
Send out, into later procedure.
According to H atom or the characteristic of ion, the diffusion in steel is inevitable, and H can form H traps after entering in steel, have
H will largely assemble in a little hydrogen traps, ultimately form gross imperfection.This kind of hydrogen trap and different tissues, field trash type and shape
Looks, different tissues interface are relevant.
To ensure excellent Properties of HIC resistance, the degree of purity of steel is extremely important, wherein needing to control S contents in steel as far as possible
And S controls 0.0005% and less, while are made MnS with nodularization by S inclusion contents and pattern, the present invention by Ca processing
Mode is present, and such MnS total amounts in steel are seldom, and substantially by nodularization.Practice have shown that when S contents as little as 0.0005% in steel
And it is following, for Ca/S than control at 1~2, nodularization is complete by MnS, and now Ca contents will not be excessive in steel, thus will not be to furnace lining
It is undue to corrode.
Banded structure is to cause one of HIC major reason.For pipe line steel X90 grade of steels, intensity is very high, is usually
Ensure pipe line steel Properties of HIC resistance, Mn contents are no more than 1.45% or so, in the case of this low Mn, to ensure that X90 grade of steels are strong
Degree and Properties of HIC resistance are, it is necessary to more alloy, so as to greatly increase cost.And the present invention is from cost consideration, then still use compared with
High Mn designs, but to be formed from technique to control Mn to be segregated, i.e.,：1）Low overheat is used since continuous casting, during cast, simultaneously
Using slighter compress, the original band in strand can be improved as far as possible；2）Slab reheating is greatly improved in follow-up reheating operation
Temperature（120 DEG C or so are improved than conventional pipeline steel heating-up temperature）With extension rethermalization time, it is segregated further to slow down Mn；
3）Ensure that blank center portion also fully recrystallizes by roughing process high-temperature and continuous 3 passage roughing heavy reduction rate, so as to disappear
Except blank original austenite influences；4）Because roughing end temp is very high, it is necessary to moderately be cooled down by base among mild cooling
System carries out middle base cooling, so as to prevent middle base austenite crystal thick.That is continuous casting+elevated heating processes are passed through
And specific TMCP techniques can control original in steel and secondary banding particularly center portion banded structure, so as in inexpensive situation
Under ensure that the excellent hic resistance energy of superhigh intensity X90 steel grade steel plate center portions.
The present invention has following features：1）Using the higher Mn composition designs of low-carbon, and by from continuous casting and subsequent heat and
Roll to control banded structure to be formed, so as to obtain the hic resistance X90 steel grade steel plates of very economical； 2）Using S≤0.0005%
Composition processing and control Ca/S ratio 1.0~2.0, make MnS nodularizations, Ca contents are not excessive in molten steel, can greatly reduce Ca
Erosion to furnace lining, help to extend the service life of refining furnace, and reduce cost；3）Entered using low overheat and slighter compress
Row continuous casting, improve original band and organize the formation of；4）Specific T MCP techniques are used in follow-up heating of plate blank and rolling, are obtained specific
Tissue, while formed by the secondary banded structure in specific T MCP technology controlling and process steel so that steel plate obtain it is excellent anti-
HIC performances, and there is excellent low-temperature flexibility；3）Using this composition design and technological design, 20mm thickness specifications can be produced
X90 Pipeline Steel Plates.
Brief description of the drawings
Fig. 1 is the organization chart of the light plate of the embodiment of the present invention 1；
Fig. 2 is the hic resistance detection figure of steel plate of the embodiment of the present invention；
Fig. 3 is the operation sketch of middle base appropriateness cooling system in the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, embodiment.
Embodiment 1
The thickness of the X90 Pipeline Steel Plates of the hic resistance of the present embodiment is 20mm, and its chemical composition is by mass percentage：
C：0.06%, Mn：1.70%, Si：0.15%, S：0.0005%, P：0.01%, Nb：0.055%, Ti：0.018%, V：≤ 0.05%,
Al：0.030%, Mo+Cu+Ni+Cr≤0.6%, N≤0.010%, O：≤ 0.006%, Ca：0.0008%, surplus is for Fe and not
Evitable impurity element.
Raw materials for metallurgy is pre-processed through KR molten iron successively first, converter smelting, LF refinings, RH vacuum refinings, refined
In journey control molten steel in S content≤0.0005%, then feed Ca-Si lines, control Ca/S in molten steel content ratio be 1.0~
2.0, then continuous casting go out to meet that chemical composition requirement, thickness are continuous casting billet not less than 350mm, the degree of superheat of molten steel is not during continuous casting
Higher than 15 DEG C, and carry out slighter compress；Overall compression ratio is 15, continuous casting billet is again heated into 1280~1310 DEG C, insulation is small not less than 8
When；Two-phase control rolling is carried out after coming out of the stove：First stage is recrystallization zone rolling, and finishing temperature control is at 1210 DEG C, recrystallization zone
The single pass reduction ratio of continuous two passage is controlled to be not less than 28% during rolling；After first stage rolling terminates, middle base immediately enters
Middle base appropriateness cooling system, the operation sketch of middle base appropriateness cooling system is illustrated in figure 3, middle base is in middle base appropriateness
The appropriateness cooling in a manner of swinging back and forth in cooling system, cooling velocity is controlled in 12 DEG C/s, by appropriate cooling technique by
Between base be comparatively fast cooled to the second stage start rolling temperatures of needs；Second stage is rolled for non-recrystallization zone, and start rolling temperature is not higher than
890 DEG C, until final thickness, finishing temperature is 820 DEG C, and non-recrystallization zone adds up deformation rate and is not less than 60%；Then pass through ACC
Cooled down, terminate chilling temperature and be not higher than 420 DEG C；Cooling velocity is 18 DEG C/s；Room temperature is cooled to afterwards produces steel plate finished product.
Referred to via the thick X90 pipeline steels of 20mm made from above-mentioned manufacturing process, excellent combination property, mechanical performance
Table 1, Properties of HIC resistance is shown in Table 2.
Embodiment 2
The thickness of the X90 Pipeline Steel Plates of the hic resistance of the present embodiment is 19.6mm, and its chemical composition is by mass percentage
For：C：0.04%, Mn：1.90%, Si：0.28%, S：0.0005%, P：0.01%, Nb：0.058%, Ti：0.018%, V：≤
0.05%, Al：0.030%, Mo+Cu+Ni+Cr≤0.9%, N≤0.010%, O：≤ 0.006%, Ca：0.0008%, surplus is
Fe and inevitable impurity element.
Raw materials for metallurgy is pre-processed through KR molten iron successively first, converter smelting, LF refinings, RH vacuum refinings, refined
In journey control molten steel in S content≤0.0005%, then feed Ca-Si lines, control Ca/S in molten steel content ratio be 1.0~
2.0, the continuous casting billet that then continuous casting goes out to meet chemical composition requirement, thickness is 300mm, the degree of superheat of molten steel is not higher than 15 during continuous casting
DEG C, and carry out slighter compress；Continuous casting billet is again heated to 1290~1300 DEG C, is incubated 8 hours；Overall compression ratio is 15.3, after coming out of the stove
Carry out two-phase control rolling：First stage rolls for recrystallization zone, and at 1200 DEG C, recrystallization zone controls finishing temperature control when rolling
The single pass reduction ratio of continuous two passage is not less than 28%；After first stage rolling terminates, middle base immediately enters middle base appropriateness
Cooling system, the appropriateness cooling in a manner of swinging back and forth in middle base appropriateness cooling system of middle base, cooling velocity control exist
10 DEG C/s, middle base is comparatively fast cooled to the second stage start rolling temperature of needs by appropriate cooling technique；Second stage is non-
Recrystallization zone rolls, and start rolling temperature is not higher than 890 DEG C, and until final thickness, finishing temperature is 800 DEG C, and non-recrystallization zone adds up
Deformation rate is not less than 60%；Then cooled down by ACC, terminate chilling temperature and be not higher than 480 DEG C；Cooling velocity is 25 DEG C/s；
Room temperature is cooled to afterwards produces steel plate finished product.
It is detailed via the thick X90 pipeline steels of 19.6mm made from above-mentioned manufacturing process, excellent combination property, mechanical performance
1 is shown in Table, Properties of HIC resistance is shown in Table 2.
Embodiment 3
The thickness of the X90 Pipeline Steel Plates of the hic resistance of the present embodiment is 20mm, and its chemical composition is by mass percentage：
C：0.02%, Mn：1.85%, Si：0.35%, S：0.0005%, P：0.01%, Nb：0.058%, Ti：0.018%, V：≤ 0.05%,
Al：0.030%, Mo+Cu+Ni+Cr≤0.9%, N≤0.010%, O：≤ 0.006%, Ca：0.0008%, surplus is for Fe and not
Evitable impurity element.
Raw materials for metallurgy is pre-processed through KR molten iron successively first, converter smelting, LF refinings, RH vacuum refinings, refined
In journey control molten steel in S content≤0.0005%, then feed Ca-Si lines, control Ca/S in molten steel content ratio be 1.0~
2.0, the continuous casting billet that then continuous casting goes out to meet chemical composition requirement, thickness is 370mm, the degree of superheat of molten steel is not higher than 15 during continuous casting
DEG C, and carry out slighter compress；Continuous casting billet is again heated to 1280~1300 DEG C, is incubated 8 hours；Overall compression ratio is 18.5, after coming out of the stove
Carry out two-phase control rolling：First stage rolls for recrystallization zone, and at 1180 DEG C, recrystallization zone controls finishing temperature control when rolling
The single pass reduction ratio of continuous two passage is not less than 28%；After first stage rolling terminates, middle base immediately enters middle base appropriateness
Cooling system, the appropriateness cooling in a manner of swinging back and forth in middle base appropriateness cooling system of middle base, cooling velocity control exist
10 DEG C/s, middle base is comparatively fast cooled to the second stage start rolling temperature of needs by appropriate cooling technique；Second stage is non-
Recrystallization zone rolls, and start rolling temperature is not higher than 900 DEG C, and until final thickness, finishing temperature is 800 DEG C, and non-recrystallization zone adds up
Deformation rate is not less than 60%；Then cooled down by ACC, terminate chilling temperature and be not higher than 400 DEG C；Cooling velocity is 15 DEG C/s；
Room temperature is cooled to afterwards produces steel plate finished product.
Referred to via the thick X90 pipeline steels of 20mm made from above-mentioned manufacturing process, excellent combination property, mechanical performance
Table 1, Properties of HIC resistance is shown in Table 2.
The mechanical performance for the steel plate that 1 each embodiment of table is produced
2 each embodiment of table produces the hic resistance of steel plate and anti-SSCC performances
Claims (3)
1. a kind of X90 Pipeline Steel Plates of economical hic resistance, the chemical composition of the steel plate is C by mass percentage：0.02~
0.06%, Mn：1.7~1.90%, Si：0.15~0.35%, S：≤ 0.0005%, P：≤ 0.010%, Nb：0.04~
0.07%, Ti：0.008~0.03%, V：≤ 0.10%, Al：≤ 0.06%, N：≤ 0.010%, O：≤ 0.006%, Mo：≤
0.20%, Cu：≤ 0.20%, Ni：≤ 0.20%, Cr≤0.20%, Ca：0.0005~0.0015%, and Ca/S content ratio
It is worth for 1.0~2.0, surplus is Fe and inevitable impurity element；
Manufacturing technology steps are as follows：
Raw materials for metallurgy is pre-processed through KR molten iron successively, converter smelting, LF refining, RH vacuum refinings, steel is controlled in refining process
S content≤0.0005% in water, Ca-Si lines are then fed, the content ratio for controlling Ca/S in molten steel is 1.0~2.0, Ran Houlian
Cast out the continuous casting billet for meeting that chemical composition requirement, thickness are not less than 350mm, the degree of superheat of molten steel is not higher than 15 DEG C during continuous casting；
Continuous casting billet is again heated to 1280~1310 DEG C, insulation is not less than 8 hours；Two-phase control rolling is carried out after coming out of the stove：Blank is thick
The overall compression ratio of degree and finished product thickness is not less than 15；Roll in two stages, the first stage rolls for recrystallization zone, finishing temperature control
For system at 1180~1210 DEG C, recrystallization zone controls the single pass reduction ratio of continuous two passage to be not less than 28% when rolling；First rank
After section rolling terminates, middle base immediately enters middle base appropriateness cooling system, middle base in middle base appropriateness cooling system with
The mode that swings back and forth moderately cools down, and cooling velocity control is in 9~13 DEG C/s, by appropriate cooling technique by middle base compared with rapid cooling
But the second stage start rolling temperature needed is arrived；Second stage rolls for non-recrystallization zone, and start rolling temperature is not higher than 900 DEG C, until
Final thickness, finishing temperature control are not higher than 830 DEG C, and non-recrystallization zone adds up deformation rate and is not less than 60%；Then entered by ACC
Row cooling, terminate chilling temperature and be not higher than 500 DEG C；Cooling velocity is 15~25 DEG C/s；Be cooled to afterwards room temperature produce steel plate into
Product.
2. the X90 Pipeline Steel Plates of economical hic resistance according to claim 1, it is characterised in that：The middle base is moderately cold
But system is arranged between the roughing mill and finishing mill of 4300mm wide and heavy plate mill production lines, and the system is body structure, is amounted to
Long 18m, in casing top, dense distribution spray spout, appropriate cooling is carried out to the middle base after roughing, according to different middle bases
Thickness, the middle base cooling velocity of acquisition is 9~13 DEG C/s, for base among think gauge, it is contemplated that design limit, maximum cooling
Speed is in 13 DEG C/s, and for Thin Specs, maximum cooling velocity can reach 9 DEG C/s.
3. the X90 Pipeline Steel Plates of economical hic resistance according to claim 2, it is characterised in that：The middle base is moderately cold
But the work flow of system：Blank through obtaining middle base after the completion of roughing, middle base among entering after base appropriateness cooling system,
Corresponding roller-way enters weave mode in system, middle base is swung back and forth in system, while nozzle spray sprays to middle base
Water, control middle base to be cooled to the start rolling temperature of second stage rolling with specific cooling velocity, treat that middle base is cooled to second
After the start rolling temperature of stage rolling, middle base will be sent out out of middle base appropriateness cooling system, into later procedure.
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| CN201610314574.5A CN105803327B (en) | 2016-05-13 | 2016-05-13 | The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance |
| PCT/CN2016/102373 WO2017193537A1 (en) | 2016-05-13 | 2016-10-18 | Economical hic-resistant x90 pipeline steel plate and manufacturing method therefor |
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| CN201610314574.5A CN105803327B (en) | 2016-05-13 | 2016-05-13 | The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance |
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| CN105803327B (en) * | 2016-05-13 | 2018-02-23 | 江阴兴澄特种钢铁有限公司 | The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance |
| CN107099744A (en) * | 2017-04-01 | 2017-08-29 | 江阴兴澄特种钢铁有限公司 | The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance |
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| CN109055868B (en) * | 2018-10-10 | 2020-02-18 | 鞍钢股份有限公司 | Production method of X80 thick ultra-wide longitudinal submerged arc welding pipeline steel |
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| CN105803327B (en) * | 2016-05-13 | 2018-02-23 | 江阴兴澄特种钢铁有限公司 | The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance |
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