CN107099744A - The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance - Google Patents
The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance Download PDFInfo
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- CN107099744A CN107099744A CN201710213371.1A CN201710213371A CN107099744A CN 107099744 A CN107099744 A CN 107099744A CN 201710213371 A CN201710213371 A CN 201710213371A CN 107099744 A CN107099744 A CN 107099744A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- 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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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C—ALLOYS
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The invention discloses the X80 bend pipe Pipeline Steel Plates of hic resistance, composition design principle uses appropriate C, Mn, by adding the micro alloying elements such as micro Nb, V, Ti, add the elements such as a small amount of Mo, Cu, Ni simultaneously, with reference to specific T MCP techniques, so as to the final Properties of HIC resistance ensured under every mechanical property, especially carbon equivalent high.Manufacturing process is：Proportioning get the raw materials ready → carry out heap after converter or electric furnace smelting → external refining → continuous casting → slab reheating → specific T MCP techniques+water cooling it is cold → aligning, specific TMCP is to include two-phase control rolling and middle base cooling, solve the problems, such as the Properties of HIC resistance under carbon equivalent high so that X80 bend pipe Pipeline Steel Plates have excellent Properties of HIC resistance.
Description
Technical field
The invention belongs to X80 bend pipes Pipeline Steel Plate manufacturing technology field, and in particular to the X80 bend pipes pipeline of hic resistance is used
Steel plate and its manufacture method.
Background technology
Fossil energy is also accounted in energy resource structure in the energy of current world demand the principal status of public economy, in recent years World Economics
Rapidly increase the rapidly growth for greatly having driven fossil energy demand, this has been also greatly facilitate the hair of long distance delivery pipeline
Exhibition, to improve transfer efficiency, reduction investment, long range petroleum gas delivering pipe line with the development trend of steel be to high intensity or
Superelevation grade of steel develops.The pipe line steel highest grade of steel that current countries in the world are used is X80 steel-grade.One pipeline engineering removes straight length
Outside, bend loss and yard bend pipe in addition to for changing duct orientation etc..Bend pipe generally uses clod wash and hot-bending bends two
Technique productions are planted, by cold bending is influenceed gradually to be substituted by fire bending technique by manufacture craft and Service Environment.Fire bending
Main pipe is heated to more than Ac3 by bend pipe typically by induction heating equipment, is turned fixed under wall and back pressure effect, is made heating
Area is rotated so as to the bend pipe of radius of curvature needed for bending out around fixed center, after roll forming again by annular cooling ring to bend pipe outside
Circle is cooled down, because cooling capacity is limited, therefore the region heated is carried out to be similar to ACC acceleration coolings.After having cooled down
In view of performance uniformity, also need to carry out temper.Whole technique is used, and overall fire bending+cooling technique is similar to TMCP works
Skill, i.e. high temperature deformation（Bending）+ ACC cooling procedures.
There are application X80 steel-grade bend pipe and bend pipe steel plate patent report both at home and abroad at present, such as number of applying for a patent is CN
101880818 are applied for a patent, CN201410239039.9 is applied for a patent, the number of applying for a patent is CN201010199050.9 etc., this
Apply for a patent the hic resistance performance for being not involved with bend pipe steel plate or bend pipe a bit.The number of applying for a patent is
CN201310477888.9, which is applied for a patent, mentions a kind of a kind of heat treatment side that bend pipe Properties of HIC resistance is improved by Technology for Heating Processing
Method, this method and the fire bending technique generally used at present are entirely different,And due to being related to two kinds of large span temperature groups away from progress Heat treatment, thus actual industrial production is extremely difficult and production efficiency is very low, does not possess industrial production feasibility.
Bend pipe whole austenite deformation and is subsequently cooled down relatively easy and not due to consideration that in its fire bending technical process
Foot, therefore carbon equivalent high composition design can only be used at present compared with straight tube steel plate when designing bend pipe with steel plate.High-carbon is worked as
There is HIC high susceptibilities again in amount composition design.
The present patent application patent of invention will use carbon equivalent high composition design, but pass through life due to fire bending process characteristic
Production. art is innovated, and obtains a kind of hic resistance X80 bend pipe Pipeline Steel Plates.
The content of the invention
The present invention relates to the X80 steel-grade bend pipe Pipeline Steel Plate and its manufacture method of hic resistance, for carbon equivalent high into setting up separately
Meter, the production technology to bend pipe pipe line steel steel plate is improved, and technique is terse, lumber recovery is high.
The technical scheme that present invention solution above-mentioned technical problem is used is a kind of X80 bend pipe pipe line steel of hic resistance
Plate, the chemical composition of the steel plate is C by mass percentage：≤0.10%、Mn：1.45~1.80%, Si：≤ 0.45%, S：≤
0.001%, P：≤ 0.010%, Nb：0.045~0.08%, Ti：≤0.012%、V：≤ 0.008%, Alt：≤ 0.06%, N: ≤
0.0040%, O：≤ 0.004%, Mo：≤ 0.40%, Pb≤0.0015%, Zn≤0.003%, Sb≤0.0015%, Sn≤0.0015%,
Cu：≤0.30%、Ni：0.20-1.5%, Cr：≤ 0.35%, Mo+Cu+Ni+Cr≤1.5%, Ca/S >=1：Ceq：0.43-0.54%,
Pcm：0.19-0.27%, surplus is Fe and inevitable impurity member.
Further, the thickness of steel plate is 18.4-37.9mm；Yield strength >=600Mpa of the steel plate；Tensile strength
>=710Mpa, yield tensile ratio≤0.93, plate sample elongation percentage >=29%, -30 DEG C of ballistic work >=300J, -40 DEG C of ballistic work >=200J, -60
DEG C ballistic work >=150J, steel plate has excellent Properties of HIC resistance.
Present component design principle is to use appropriate C, Mn, by adding the micro alloying elements such as micro Nb, V, Ti,
The elements such as a small amount of Mo, Cu, Ni are added simultaneously, it is especially high so as to the every mechanical property of final guarantee with reference to specific T MCP techniques
Properties of HIC resistance under carbon equivalent, the addition principle of its main basic element is as follows：
C：C is most economical, most basic intensified element in steel, and the strong of steel can be significantly improved by solution strengthening and precipitation strength
Degree, but adverse effect is brought to the toughness and ductility and welding performance of steel, therefore the development trend of pipe line steel is may closely to drop
Low C content, but in view of the matching relationship of fire bending technique and intensity and toughness, by C content control not higher than 0.10%.
：The intensity of steel is improved by solution strengthening, is to make up in pipe line steel to cause loss of strength most because C content is reduced
Main element, Mn still expands the element of γ phase regions simultaneously, it is possible to decrease γ → α phase transition temperatures of steel, helps to obtain tiny
Phase-change product, can improve the toughness of steel, reduce tough brittle transition temperature, Mn is also the quenching degree element for improving steel.Consider
Find that Mn segregations are unfavorable to Properties of HIC resistance in checkout procedure, but consider that fire bending technique takes into account intensity requirement simultaneously simultaneously, this
The design of Mn contents is in 1.45~1.85% scopes in invention, to alleviate because of higher the brought center segregations of Mn, using light during continuous casting
Pressure.
：It is one of topmost micro alloying element in modern micro alloyed steel particularly pipe line steel, to crystal grain refinement
Effect is clearly.The Nb in solid solution towing and course of hot rolling by Nb（C, N）Strain induced precipitate can hinder deformation Ovshinsky
The recovery and recrystallization of body, tiny phase-change product is changed into phase transformation through the TMCP deformed austeaites for rolling Unhydrated cement,
So that steel has high intensity and high tenacity, the present invention mainly determines Nb content ranges by the relation of C and Nb contents,
V：With higher precipitation strength and weaker Grain Refinement Effect, it is combined in tri- kinds of micro alloying elements of Nb, V, Ti
In use, V mainly plays precipitation strength.
：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, is indispensable element in pipe line steel, but too high Ti can form big TiN particles, and influence falls
Hammer performance into shape, therefore the application patent controls Ti between not higher than 0.015%.
：The formation of ferritic phase is first separated out when can postpone γ → α phase transformations, promotes the essential element of acicular ferrite formation,
Control phase transformation is played an important role, while being also the quenching degree element for improving steel.In certain cooling velocity and final cooling temperature
Obvious acicular ferrite or bainite structure can be obtained by adding certain Mo, it is contemplated that TMCP techniques and fire bending work down
Skill, Mo contents control is being not less than 0.15%.
、P：It is inevitable impurity element in pipe line steel, it is desirable to more low better, passes through super-low sulfur and Ca processing changes sulphur
Compound form can make pipe line steel have very high impact flexibility.
、Ni：The intensity of steel can be improved by solution strengthening, on the one hand Ni addition can improve the toughness of steel, improve simultaneously
Cu easily caused red brittleness in steel, Ni contents control is being not less than 0.2%.
：Cr addition can improve the quenching degree of steel, and relatively economical.
It is a further object of the present invention to provide the preparation method of the X80 bend pipe Pipeline Steel Plates of above-mentioned hic resistance,
Raw materials for metallurgy is pre-processed through KR molten iron successively, converter smelting, LF refinings, RH vacuum refinings and continuous casting are adopted during refining
With Ca processing, Ca/S is not less than 1, and B classes are mingled with into control at not higher than 1.0 grades, uses slighter compress to improve because of Mn during continuous casting
The core segregation that content height is caused, produces and meets the continuous casting billet that chemical composition requirement, thickness are not higher than 350mm, compress simultaneously
Than being not less than 10；
Continuous casting billet is reheated, two add section temperature control at not higher than 1300 DEG C, and this bringing-up section residence time is not less than 4 hours；
Carry out including the specific T MCP techniques of two-phase control rolling and middle base cooling after coming out of the stove：First stage rolls for recrystallization zone, eventually
Roll temperature and be not higher than 1200 DEG C, recrystallization zone controls the single pass reduction ratio of continuous two to three passage to be not less than 22% when rolling；In
Between base cooling be the non-recrystallization zone open rolling that is moderately cooled to second stage to middle base by Mild cooling cooling systems
Temperature, the type of cooling is to be cooled down in casing by the way of swinging back and forth, and cooling rate is 6-12 DEG C/s, it is ensured that recrystallization zone
Austenite crystal is no longer grown up after rolling deformation, and middle base surface and the center portion temperature difference are smaller；Second stage is that non-recrystallization zone rolls
System, start rolling temperature is not higher than 900 DEG C, until final thickness, and finishing temperature control is not higher than 850 DEG C；It is cold with water-cooling pattern after rolling
But steel plate, begins to cool down temperature control for not higher than 800 DEG C, and it is not higher than 450 DEG C to terminate chilling temperature control, and cooling velocity is
10~35 DEG C/s；Aligned after cooling, finally direct cool to room temperature and produce steel plate finished product.
The Mild cooling cooling systems that the present invention is used are arranged between the roughing mill of production line of rolling mill and finishing mill,
The system is body structure, altogether long 18m, and in casing top, dense distribution spray spout is fitted to the middle base after roughing
Degree cooling, according to different workpiece thickness, the middle base cooling velocity of acquisition is 4~18 DEG C/s, and workpiece thickness is according to product
Needed with production generally in the thick left and right of 40~180mm, it is thick less than 40mm in the middle of base due to relatively thin, unless needed for, be typically not required into
Row is opened middle base and moderately cooled down；For base in the middle of think gauge, it is contemplated that design limit, maximum cooling velocity in 4 DEG C/s, for
Thin Specs, maximum cooling velocity can reach 18 DEG C/s.
Further, the work flow of Mild cooling cooling systems：Blank is obtained after the completion of being rolled through recrystallization zone
Middle base, middle base enters after Mild cooling cooling systems, and corresponding roller-way enters weave mode in system, makes middle base
Swung back and forth in system, while nozzle spray is sprayed water to middle base, base is cooled to the with specific cooling velocity in the middle of control
The start rolling temperature of two-stage rolling, after middle base is cooled to the start rolling temperature of second stage rolling, middle base will be from middle base
Sent out in appropriate cooling system, into second stage rolling process.
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 S contents in control steel as far as possible
And S inclusion contents and pattern, the present invention by S controls 0.0005% and less, while making MnS by Ca processing with nodularization
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, Ca/S is than control at 1~2, and completely, now Ca contents will not be excessive in steel, thus will not be to furnace lining for MnS nodularizations
It is undue to corrode；It is mingled with rank additionally by control B classes, it is extremely beneficial to improving Properties of HIC resistance.
Banded structure is to cause one of HIC major reason.For pipe line steel X80 steel-grade, 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 X80 steel-grade is strong
Degree and Properties of HIC resistance are, it is necessary to more alloy, so as to greatly increase cost.And it is of the invention from cost consideration, still using higher
Mn design, using from technique to Mn segregations formed be controlled, that is to say, that pass through continuous casting+elevated heating processes and spy
Fixed TMCP techniques control original in steel and secondary banding particularly center portion banded structure, so that under low-alloy cost conditions
Ensure the X80 steel-grade bend pipe excellent hic resistance energy of Pipeline Steel Plate center portion.
The present invention has following features：
1）Using suitable composition and special process, the Properties of HIC resistance under carbon equivalent high is solved the problems, such as so that X80 bend pipes are managed
Line steel plate has excellent Properties of HIC resistance.
2）The problem of invention is only fully solved bend pipe steel plate Properties of HIC resistance by technique, it is former without equipment and chemistry
The additional investment of material, site technique is easily realized, with the characteristics of production efficiency is high, technique is simple.
3）Under big heavy wall and carbon equivalent high and containing Mo, Cr it is higher in the case of, aggregation shape grain is readily available under normal circumstances
Shellfish is organized, and this tissue is very unfavorable to HIC performances, and the application patent is by process innovation, carbon equivalent high and containing Mo and
In the case of Cr is higher, obtain compared with granule shellfish tissue, and this grain shellfish tissue is discontinuous, this is can with excellent HIC resistance
Main cause.Referring to Fig. 1.
Brief description of the drawings
Fig. 1 is the organization chart of X80 bend pipes pipe line steel of the present invention；
Fig. 2 is the outline drawing after the HIC experiments of steel plate of the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, embodiment.
Hic resistance X80 steel-grade bend pipe is with the manufacturing process of Pipeline Steel Plate：Proportioning get the raw materials ready → carry out converter or electric furnace smelting
Heap is cold after → external refining → continuous casting → slab reheating → specific T MCP techniques+water cooling → align.
Concrete technology step is as follows：Raw materials for metallurgy is true through the pretreatment of KR molten iron, converter smelting, LF refinings, RH successively
Sky refining and continuous casting, during refining control Ca/S ratios be not less than 1, while by B classes be mingled with control it is at 1.0 grades and following, adopted during continuous casting
Use slighter compress technique, it is therefore intended that improve the core segregation caused by Mn contents are higher.Produce meet chemical composition requirement,
Continuous casting billet thick 350mm；During heating of plate blank two plus section temperature control at not higher than 1300 DEG C, and this bringing-up section residence time not
Less than 4 hours；Then carry out specific T MCP techniques+water cooling+aligning.
Specific T MCP techniques include two-phase control rolling and middle base cooling：First stage rolls for recrystallization zone, finish to gauge temperature
Degree control is at not higher than 1200 DEG C, and recrystallization zone controls the single pass reduction ratio of continuous two to three passage to be not less than 22% when rolling；
Middle base cooling is the non-recrystallization for being quickly cooled to second stage to middle base by Mild cooling cooling systems
Area's start rolling temperature, the type of cooling is is to be cooled down in mild cooling casings using the formula of swinging back and forth, and cooling rate speed is
6-12 DEG C/s, it is ensured that austenite crystal is no longer grown up after recrystallization zone rolling deformation, middle base surface and the center portion temperature difference are smaller；
Second stage rolls for non-recrystallization zone, and start rolling temperature is not higher than 900 DEG C, and finishing temperature control is at not higher than 850 DEG C.
With water-cooling pattern cooling metal sheets after rolling, temperature control is begun to cool down for not higher than 800 DEG C, terminates chilling temperature control
To be not higher than 450 DEG C, cooling velocity is 10~35 DEG C/s；Aligned after cooling, finally direct cool to room temperature and produce steel plate finished product.
The specific chemical composition of steel plate involved by each embodiment is shown in Table 1, and specific TMCP technological parameters are shown in Table 2, main mechanical
Performance is shown in Table 3.
Table 1
| Embodiment | C | Mn | Si | S | P | Nb | Ti | V | Alt | Mo+Cu+ Ni+Cr | Ca/S | B classes are mingled with Grading |
| 1 | ≤0.10 | 1.45-1.85 | ≤0.45 | ≤0.0005 | ≤0.01 | ≤0.08 | ≤0.015 | 0.007 | ≤0.060 | ≤1.5 | ≥1 | ≤1.5 |
| 2 | ≤0.10 | 1.45-1.85 | ≤0.45 | ≤0.0005 | ≤0.010 | ≤0.08 | ≤0.015 | 0.008 | ≤0.068 | ≤1.5 | ≥1 | ≤1.5 |
| 3 | ≤0.05 | 1.45-1.85 | ≤0.45 | ≤0.0005 | ≤0.010 | ≤0.08 | ≤0.015 | 0.007 | ≤0.060 | ≤1.5 | ≥1 | ≤1.5 |
Table 2
Table 3
Each embodiment produces the Properties of HIC resistance such as table 4 of steel plate.
Table 4
Claims (5)
1. a kind of X80 bend pipe Pipeline Steel Plates of hic resistance, the chemical composition of the steel plate is C by mass percentage：≤0.10%、
Mn：1.45~1.80%, Si：≤ 0.45%, S：≤ 0.001%, P：≤ 0.010%, Nb：0.045~0.08%, Ti：≤0.012%、
V：≤ 0.008%, Alt：≤ 0.06%, N:≤ 0.0040%, O：≤ 0.004%, Mo：≤ 0.40%, Pb≤0.0015%, Zn≤
0.003%, Sb≤0.0015%, Sn≤0.0015%, Cu：≤0.30%、Ni：0.20-1.5%, Cr：≤ 0.35%, Mo+Cu+Ni+Cr
≤ 1.5%, Ca/S >=1：Ceq：0.43-0.54%, Pcm：0.19-0.27%, surplus is Fe and inevitable impurity member.
2. the X80 bend pipe Pipeline Steel Plates of hic resistance according to claim 1, it is characterised in that：The thickness of the steel plate is
18.4-37.9mm；Yield strength >=600Mpa of the steel plate；Tensile strength >=710Mpa, yield tensile ratio≤0.93, the extension of plate sample
Rate >=29%, -30 DEG C of ballistic work >=300J, -40 DEG C of ballistic work >=200J, -60 DEG C of ballistic work >=150J, steel plate has excellent
Properties of HIC resistance.
3. a kind of method for the X80 bend pipe Pipeline Steel Plates for manufacturing hic resistance as claimed in claim 1 or 2, it is characterised in that：Work
Skill step is as follows：
Raw materials for metallurgy is pre-processed through KR molten iron successively, converter smelting, LF refinings, RH vacuum refinings and continuous casting are adopted during refining
With Ca processing, Ca/S is not less than 1, and B classes are mingled with into control at not higher than 1.0 grades, uses slighter compress to improve because of Mn during continuous casting
The core segregation that content height is caused, produces and meets the continuous casting billet that chemical composition requirement, thickness are not higher than 350mm, compress simultaneously
Than being not less than 10；
Continuous casting billet is reheated, two add section temperature control at not higher than 1300 DEG C, and this bringing-up section residence time is not less than 4 hours；
Carry out including the specific T MCP techniques of two-phase control rolling and middle base cooling after coming out of the stove：
First stage rolls for recrystallization zone, and finishing temperature is not higher than 1200 DEG C, and recrystallization zone controls continuous two to three when rolling
The single pass reduction ratio of passage is not less than 22%；
Middle base cooling is the non-recrystallization for being moderately cooled to second stage to middle base by Mild cooling cooling systems
Area's start rolling temperature, the type of cooling is to be cooled down in casing by the way of swinging back and forth, and cooling rate is 6-12 DEG C/s, it is ensured that again
Austenite crystal is no longer grown up after the rolling deformation of crystal region, and middle base surface and the center portion temperature difference are smaller；
Second stage rolls for non-recrystallization zone, and start rolling temperature is not higher than 900 DEG C, until final thickness, and finishing temperature control is not
Higher than 850 DEG C；
With water-cooling pattern cooling metal sheets after rolling, temperature control is begun to cool down for not higher than 800 DEG C, terminates chilling temperature control for not
Higher than 450 DEG C, cooling velocity is 10~35 DEG C/s；Aligned after cooling, finally direct cool to room temperature and produce steel plate finished product.
4. the manufacture method of the X80 bend pipe Pipeline Steel Plates of hic resistance according to claim 3, it is characterised in that：It is described
Mild cooling cooling systems are arranged between the roughing mill of production line of rolling mill and finishing mill, and the system is body structure, altogether
Long 18m is counted, in casing top, dense distribution spray spout carries out appropriate cooling to the middle base after roughing, according to different centres
Base thickness, the middle base cooling velocity of acquisition is 4~18 DEG C/s, workpiece thickness needed generally 40 according to product and production~
The thick left and right of 180mm, it is thick less than 40mm in the middle of base due to relatively thin, unless needed for being typically not required to progress and open middle base moderately to cool down；
For base in the middle of think gauge, it is contemplated that design limit, maximum cooling velocity is in 4 DEG C/s, for Thin Specs, and maximum cooling velocity can
Reach 18 DEG C/s.
5. the manufacture method of the X80 bend pipe Pipeline Steel Plates of hic resistance according to claim 3, it is characterised in that：The Mild
The work flow of cooling cooling systems：Blank obtains middle base after the completion of being rolled through recrystallization zone, middle base enters Mild
After cooling cooling systems, corresponding roller-way enters weave mode in system, middle base is swung back and forth in system, simultaneously
Nozzle spray is sprayed water to middle base, and base is cooled to the start rolling temperature of second stage rolling with specific cooling velocity in the middle of control,
After middle base is cooled to the start rolling temperature of second stage rolling, middle base will be sent out out of middle base appropriate cooling system, be entered
Enter second stage rolling process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710213371.1A CN107099744A (en) | 2017-04-01 | 2017-04-01 | The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance |
| PCT/CN2017/105453 WO2018176788A1 (en) | 2017-04-01 | 2017-10-10 | Pipeline steel plate for hic-resistant x80 elbow pipe and manufacturing method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710213371.1A CN107099744A (en) | 2017-04-01 | 2017-04-01 | The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance |
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| CN107099744A true CN107099744A (en) | 2017-08-29 |
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| WO (1) | WO2018176788A1 (en) |
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| WO2018176788A1 (en) * | 2017-04-01 | 2018-10-04 | 江阴兴澄特种钢铁有限公司 | Pipeline steel plate for hic-resistant x80 elbow pipe and manufacturing method therefor |
| CN109234618A (en) * | 2018-09-18 | 2019-01-18 | 江阴兴澄特种钢铁有限公司 | A kind of economical HIC resistance pipeline steel plate X70MS and its manufacturing method |
| CN109234623A (en) * | 2018-09-29 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of strain resistant Pipeline Steel Plate in the deep-sea X80M and rolling mill practice |
| CN109234622A (en) * | 2018-09-29 | 2019-01-18 | 南京钢铁股份有限公司 | The strain resistant pipe line steel in the deep-sea X80M and smelting process |
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| CN112063918A (en) * | 2020-07-29 | 2020-12-11 | 江阴兴澄特种钢铁有限公司 | Pipeline steel plate for low-temperature high-toughness X90 steel grade hot-bending bend pipe and manufacturing method thereof |
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