CN105586529B - A kind of 890MPa grade high-strengths steel, steel pipe and its manufacture method - Google Patents
A kind of 890MPa grade high-strengths steel, steel pipe and its manufacture method Download PDFInfo
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—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
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- 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
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Abstract
The invention discloses a kind of 890MPa grade high-strengths steel, its chemical elements in percentage by mass is：C：0.12 0.18%, Si：0.1 0.4%, Mn：0.8 1.4%, Cr：0.5 0.9%, Mo：0.20 0.60%, W：0.01 0.08%, Ni：0.50 1.30%, Nb：0.01 0.06%, V：0.03 0.12%, Al：0.01 0.05%, Ca：0.0005 0.005%, also meet relational expression：5<Ni/(C*Mo)≤50.The invention also discloses a kind of steel pipe, it uses the 890MPa grade high-strength steels of this case to obtain.The invention also discloses a kind of manufacture method of steel pipe, it includes step：Make steel and be cast into round billet；Round billet is heated；High-pressure water descaling；Tube rolling；Tempering and Quenching；High-pressure water descaling；Thermal straightening.
Description
Technical field
The present invention relates to a kind of alloy steel products and its manufacture method, more particularly to a kind of high-strength alloy steel and its manufacture
Method.
Background technology
Current engineering machinery and steel construction piece develop towards big load-bearing, light-weighted direction.Lightweight direction is to improve material
Expect intensity, can not only reduce the deadweight of structure, save material, be also beneficial to improve the integrated carrying ability of structure.But, it is right
For the steelwork component of top load is born, in order to improve the resisting longitudinal unstability ability of steel pipe, while high intensity is ensured,
Enough thickness is also needed to, for example, the wall thickness of such steel construction will reach more than 16mm.However, heavy caliber thick wall high-strength steel
Often fluctuating range is larger for the properties of product of pipe, and intensity and toughness are difficult often while taking into account.
With the continuous improvement of construction machinery product performance and quality, the continuous enhancing of bearing capacity, market is to weldability
The excellent superhigh intensity of energy, the demand cumulative year after year of thick-walled structure steel pipe, solution solderability is strong, high-strength and high-ductility, thick-walled structure
The production manufacturability problem of steel pipe is very urgent.For example, Publication No. CN102747300A, publication date is October 24 in 2012
Day, the Chinese patent literature of entitled " a kind of high-strength and high-ductility Seamless Steel Structural Tubes and its manufacture method " discloses a kind of height
Strong high tenacity structure use seamless steel pipe and its manufacture method.The manufacture method includes smelting molten steel, continuous casting, Tube Rolling Train rolling step
Suddenly, wherein, smelting molten steel step obtains target molten steel, and the composition of target molten steel is by weight percentage：C：0.14~
0.18%, Si：0.20~0.50%, Mn：0.90~1.30%, P≤0.020%, S≤0.010%, Cr：0.20~1.00%,
Mo：0.20~0.80%, Ni：0.90~1.50%, V：0.02~0.10%, Nb≤0.05%, Al：0.015~0.050%,
Cu≤0.35%, N≤0.020%, Ti≤0.05%, surplus is iron and inevitable impurity.Above-mentioned manufacture method also includes
Tempering and Quenching step, i.e., quenched and temper after the Tube Rolling Train milling step to steel pipe order, wherein, quench
Fiery temperature is 920~960 DEG C, and temperature is 610~660 DEG C.Because the seamless steel pipe disclosed in this patent document contains
Very Ni elements of high content, the oxide skin that steel tube surface is formed in postorder production process is difficult to get rid of, and is had a strong impact on
Steel tube surface quality.
In another example, Publication No. CN101397640A, publication date is on April 1st, 2009, entitled " yield strength
The Chinese patent literature of 960MPa grades of welded structural steels " discloses a kind of yield strength 960MPA grades of welded structural steels, Qi Gehua
Learn component and percentage by weight is：C:0.14~0.19, Si:0.15~0.40, Mn:1.40~<1.7, Mo:0.41~0.60,
B:0.0005~0.002, Cr:0~0.50, Ni:0~0.40, Nb:0~0.03, Ti:0.010~0.050, Als:0.01~
0.06, P≤0.020, S≤0.010, remaining is Fe and inevitable impurity；Meet simultaneously：Carbon equivalent ce V (%)<0.65 or
PCM (%)<0.35.Although the yield strength of the welded structural steel disclosed in the patent document can reach 890MPa level with
On, but -20 DEG C of ballistic works of the welded structural steel are only 52J.
Publication number CN104862613A, publication date is August in 2015 26, entitled " a kind of high strength steel, high strength steel
The Chinese patent literature of pipe and its manufacture method " relate to a kind of high strength steel, and its chemical element mass percentage content is：C：
0.11-0.18%, Si：0.1-0.4%, Mn：1.0-1.6%, Cr：0.25-0.9%, Mo：0.10-0.50%, W：0.10-
0.55%, Nb：0.01-0.08%, V：0.01-0.12%, Ni:0.10-0.40%, 0<B<0.0020%, 0 ＜ N≤
0.004%, 0<Ti≤0.010%, O<0.0030%, S<0.005%, Ca+Mg：0.001-0.005%, surplus is Fe and other
Inevitable impurity.W elements are with the addition of in the high strength steel disclosed in the Chinese patent literature, it can effectively be carried
Rise the intensity of Steel material so that the tensile strength ＞ 980MPa of Steel material, and while intensity is improved, compared to other conjunctions
Gold element (for example, Mo elements), the degree of the welding performance of W reduction steel is relatively low.But, due to the addition of certain content
On the one hand W, thus add steel-making difficulty, improves the difficulty of the manufacturing, on the other hand causes the Steel material after water quenching to hold
It is flexible, even if tempering after be also difficult to align.
On the premise of the intensity of Steel material is ensured, in order to reduce the difficulty of manufacturing process process, and improve steel
The plate shape and surface quality of material, enterprise, which needs badly, obtains a kind of Steel material for having high-strength tenacity and weldability concurrently, to adapt to heavy wall
The manufacturing of structured steel pipe.In addition, the Steel material is also needed to excellent surface quality and good plate shape,
The content of the invention
It is an object of the invention to provide a kind of 890MPa grade high-strengths steel, the 890MPa grade high-strengths steel has higher
Intensity, good quenching degree, excellent low-temperature flexibility and excellent welding performance.In addition, of the present invention 890MPa grades
High strength steel also has good surface quality and plate shape concurrently.
To achieve these goals, the invention provides a kind of 890MPa grade high-strengths steel, its chemical element quality percentage
Match and be：
C：0.12-0.18%；
Si：0.1-0.4%；
Mn：0.8-1.4%；
Cr：0.5-0.9%；
Mo：0.20-0.60%；
W：0.01-0.08%；
Ni：0.50-1.30%；
Nb：0.01-0.06%；
V：0.03-0.12%；
Al：0.01-0.05%；
Ca：0.0005-0.005%；
Also meet following relational expression simultaneously：5<Ni/(C*Mo)≤50；
Surplus is Fe and other inevitable impurity.
The design principle of each chemical element in 890MPa grade high-strengths steel of the present invention is：
Carbon：C is to ensure that the necessary chemical composition of matrix strength.If C content is less than 0.12%, institute's phase cannot be obtained
The intensity of prestige.If C content is higher than 0.18%, the solderability of high strength steel, and being influenced by heat in steel will be influenceed
Cause relatively low toughness in part.In consideration of it, controlling C content to be 0.12- in 890MPa grade high-strengths steel of the present invention
0.18%.
Silicon：Si is used as deoxidier in steel.In order to reach deoxidation effect, at least needed in high strength steel of the present invention
Add more than 0.1% Si.But, once Si contents, which are crossed, can at most reduce the solderability and toughness of steel.Consider deoxidation
Effect and the combination property of steel are, it is necessary to be 0.1-0.4% by the Si contents control in above-mentioned high strength steel.
Manganese：Mn also serves as a kind of deoxidier in steel.Meanwhile, in order to ensure above-mentioned 890MPa grade high-strengths steel have concurrently it is excellent
Intensity and low-temperature flexibility, Mn contents need to reach more than 0.8%.However, excessive Mn elements can also increase the quenching degree of steel,
The HAZ (heat affected area) of steel toughness and solderability can be not only reduced, and can cause to produce center segregation during continuously casting, it is female
The low-temperature flexibility of material can also deteriorate therewith.Therefore, the Mn contents in 890MPa grade high-strengths steel of the present invention should be controlled
For 0.8-1.4%.
Chromium：Cr can increase the intensity of mother metal, welding position, and improve the quenching degree of steel.If Cr too high levels, it can both make
The increase of weld cracking sensitiveness is obtained, the toughness of welding heat affected zone can be reduced again.However, Cr contents are too low, it can be played
Effect it is unobvious.Therefore, the content of the Cr in above-mentioned 890MPa grade high-strengths steel is set as into 0.5-0.9%.
Molybdenum：Mo is also one of main adding elements of the present invention, and it can improve the hardenability of steel.Meanwhile, reinforced alloys member
Plain Mo can effectively improve the intensity of Steel material.In addition, Mo easily forms three oxygen of high volatile in high-temperature oxidation environment
Change molybdenum, can effectively improve the adhesion of oxide skin, make it be easy to peel off under water under high pressure.However, adding Mo too much
The HAZ toughness of steel can be reduced, in order to reach optimal reinforcing effect, and improves the oxide skin situation on the surface of steel, it is necessary to by Mo
Content is controlled between 0.20-0.60% scopes.
Tungsten：The addition of W elements can advantageously improve the hardenability of steel.While the intensity of steel is improved, W is compared to it
His alloy principle (for example, Mo elements), the degree that it reduces the welding performance of steel is relatively low.But, W is added too much can not only show
Increase steel-making difficulty is write, production cost is improved, but also steel can be readily bent in water quenching, is difficult to align after tempering.
In technical scheme, particularly need strictly to be controlled for W elements, i.e., by the control of its content in 0.01-0.08%
Between scope.
Nickel：Ni is one of main adding elements of the present invention, can not only effectively improve the quenching degree of thick walled steel tube, may be used also
To improve the low-temperature flexibility and live solderability of material.Compared to elements such as addition Mn, Cr or Mo, addition Ni will not form unfavorable
In the sclerotic tissue of low-temperature flexibility.If Ni additions are very few, its effect is not notable, if Ni additions are excessive, is manufacturing
Oxide skin generated in process removes difficulty increase.Based on technical scheme, by 890MPa grade high-strength steel
Ni contents are set as 0.5-1.3%.
Niobium and vanadium：Nb is the important element for obtaining fine-grained steel, and it can postpone austenite recrystallization in hot rolling and reach
The purpose of crystal grain thinning.In subsequent cooling and course of hot rolling, NbC particle dispersions are separated out, and the work of precipitation strength can be played again
With.During reheating, Austenite Grain Growth can be hindered again.V has the effect similar with Nb, but its effect compares Nb
It is weaker.However, the precipitating reinforcing effect produced by V is added in high strength steel is bigger, Nb and V compound addition can cause
890MPa grade high-strengths steel of the present invention obtains more excellent comprehensive mechanical property.Consider heat affected area toughness
With live solderability, Nb and V content can not be too high.Based on technical solutions according to the invention, Nb contents should control be
0.01-0.06%, and V content should be controlled as 0.03-0.12%.
Aluminium：Al has deoxidation in steel, and it is conducive to the toughness and processing characteristics of raising steel.When Al content reaches
During to more than 0.01%, the effect of its toughness for improving steel and processing characteristics is more notable.If however, Al content exceedes
0.05%, steel-making difficulty substantially increases.Based on this, Al content needs to control in 890MPa grade high-strengths steel of the present invention
Between 0.01-0.05% scopes.
Calcium：Ca can be with cleaning molten steel so that inclusion modification reaches that acquisition is thin to control the distributional pattern of sulfide in steel
The purpose of the uniform sulfide of pellet shapes, disperse, so as to play a part of improving low-temperature flexibility.For of the present invention
For 890MPa grade high-strength steel, Ca contents should be controlled as 0.0005-0.005%.
In the technical program, in order to reduce steel-making difficulty and avoid steel from easily being bent after water quenching, key exists
In control W content.Compared to Publication No. CN104862613A, publication date is August in 2015 26, entitled " a kind of high
The content of the W in high strength steel disclosed in the Chinese patent literature of strength steel, high tensile steel tube and its manufacture method ", this hair
W content in bright technical scheme is relatively low, however, this, which can weaken W, improves the hardenability of steel and the beneficial effect of intensity.For
Make up and cause because of the reduction of W element additions this not enough, technical scheme accordingly adds adding for Ni elements
Dosage.That is, technical scheme employs the advantageous measures that drop W rises Ni compared to existing technical scheme, fill
Dividing make use of the element between W and Ni to act synergistically.
Ni lattice constant is near with γ-iron phase, can form continuous solid solution, is so advantageous for improving thick walled steel tube
Hardenability.Simultaneously as Ni can reduce critical point and increase the stability of austenite, therefore its hardening heat can be entered one
Step ground reduction, quenching degree is good, and quenching is not allowed flexible.
But inventor further has found, the Ni of addition high content can cause steel tube surface to produce thicker oxide skin,
And easily occur the problem of oxide skin is adhered to.Because Ni is a kind of more dysoxidizable element in steel, typically in steel tube regeneration
The high-temperature oxidation process twice such as 1250 DEG C or so heating of pipe blank of experience and 900 DEG C of Tempering and Quenchings is needed during production, especially
Be during 1250 DEG C or so heating of pipe blank the heat time will be up to 2-4h, steel tube surface often form thicker oxidation
Skin.In this heating process, Fe preferential oxidations just produce Ni enrichment in iron scale internal layer, form richness Ni wire netting
In silk and particle, and wedge shaped immersion metallic matrix, with the adhesiveness for the iron scale for adding the steel containing Ni.Meanwhile, with temperature
The adhesiveness of the rise iron scale of degree will increase.This rich Ni metal twine has coupled iron scale with metallic matrix
Come, because the performance parameters such as its plasticity and thermal coefficient of expansion are similar with metallic matrix, therefore under the impact of water under high pressure, still
So it is unlikely to be peel off.In this case, iron scale of the steel containing Ni formed in heating process is difficult to remove, will be rear
Surface scale defect is produced during continuous perforation, tube rolling, so as to cause steel tube surface presentation quality poor, reconditioning quality is needed greatly,
Production cycle is long, and production cost increase, delivery date such as is difficult to ensure that at many unfavorable defects.
For these reasons, the technical program also defines relational expression 5 in the case where improving Ni constituent contents<Ni/
(C*Mo)≤50, to obtain good scale removal effect, so that the iron scale that the Ni for being effectively prevented from addition high content is brought glues
Attached property phenomenon.C and Mo are effective intensified element for steel.In addition, Mo can also improve the hardenability of steel, and in height
The molybdenum trioxide of high volatile is easily formed in warm oxidation environment, to be effectively reduced the adhesion of iron scale, makes it in height
It is easy to peel off under the impact for pressing water so that iron scale is difficult to adhere to steel material surface, so as to improve the surface matter of Steel material
Amount.
Further, the microstructure of 890MPa grade high-strengths steel of the present invention is tempered sorbite.
Further, carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ of 890MPa grade high-strengths steel of the present invention
Ni/15≤0.65。
Carbon equivalent Ceq is controlled≤0.65, is conducive to improving the welding performance of Steel material, reduces welding pre-heating temperature, subtract
Few weld defect.Once carbon equivalent Ceq is more than 0.65, then welding pre-heating temperature will be unfavorable for field size more than 150 DEG C
Change and manufacture.
Further, in 890MPa grade high-strengths steel of the present invention, the P in other inevitable impurity<
0.013%, S≤0.005%.
Inevitable impurity is primarily referred to as P element and S elements in the technical program.Come for technical scheme
Say, P element and S elements are harmful elements, it is more low better that their contents in steel need, it is contemplated that smelting iron and steel cost
Economy, therefore, it can the control of the contents of S elements is≤0.005%, and is by the content control of P element<0.013%.
Further, the yield strength of 890MPa grade high-strengths steel of the present invention is big more than 890MPa, tensile strength
It is more than 100J in the low-temperature impact toughness at 960MPa, -40 DEG C.
Based on above-mentioned technical proposal, the high strength steel has higher intensity and excellent low-temperature flexibility concurrently.
890MPa grade high-strengths steel of the present invention passes through the alloy members such as compound addition appropriate Ni, Mo, Cr, V, Nb
Element, Ni measure is risen using W is dropped, and is acted synergistically by the element between W and Ni, utilizes relational expression 5<Ni/(C*Mo)≤50
To limit the optimum proportioning between Ni and C, Mo, not only cause Steel material after heating process, under water under high pressure effect just
The iron scale of steel material surface can be effectively removed, also reduction makes steel difficulty and avoids Steel material pole after water quenching process
Easily bend, which thereby enhance the surface quality of Steel material, and improve the plate shape of Steel material.Furthermore, it is of the present invention
890MPa grade high-strengths steel utilizes alloy by obtaining the Steel material with tempered sorbite microstructure after heat treatment step
The solution strengthening and precipitation strength of element improves the strength of parent of material so that Steel material also has while high intensity is kept
There is good low-temperature flexibility.Based on this, obtained by technical scheme with higher-strength, preferable low-temperature flexibility,
The 890MPa grade high-strength steel of excellent surface quality and superior weldability energy.
Another object of the present invention is to provide a kind of steel pipe.The steel pipe possesses higher intensity, good quenching degree with
And excellent low-temperature flexibility.In addition, steel pipe of the present invention has excellent welding performance, steel pipe pipe fitting is difficult bending.This
Outside, the iron scale adhesiveness of steel tube surface of the present invention is low, easily removes so that steel pipe has good surface matter
Amount.Meanwhile, the steel pipe is suitable as bearing the structural steel pipe of top load.
In order to reach foregoing invention purpose, steel pipe proposed by the invention using as mentioned above any one
890MPa grade high-strengths steel and be made.
The obdurability index of welding point and heat affected area after steel-pipe welding of the present invention can reach that pipe fitting is female
The obdurability index level of material.
Correspondingly, present invention also offers a kind of manufacture method of above-mentioned steel pipe.It can be obtained by force by the manufacture method
Degree is high, and quenching degree is good, the steel pipe that low-temperature flexibility can be excellent and excellent welding performance.In addition, obtained by the manufacture method
The excellent surface quality of steel pipe, steel pipe pipe fitting is difficult bending.In addition, the present invention manufacture method be suitable for manufacture tube wall compared with
Thick steel pipe.
In order to realize foregoing invention purpose, a kind of manufacture method of steel pipe proposed by the present invention, it includes step：
(1) make steel and be cast into round billet；
(2) round billet is heated；
(3) high-pressure water descaling；
(4) tube rolling, rolls rear air cooling；
(5) Tempering and Quenching：Hardening heat is 880-930 DEG C, and soaking time is 30-60min, then water quenching.In 580-
650 DEG C of progress high temperings, soaking time is 30-80min；
(6) high-pressure water descaling；
(7) thermal straightening：Thermal straightening temperature control is 500-600 DEG C.
The key of above-mentioned manufacture method is Tempering and Quenching process.By controlling the quenching temperature in Tempering and Quenching process
Degree and soaking time, form martensite microstructure after water quenching in steel pipe.Meanwhile, carried out at a temperature of 580-650 DEG C
High tempering, and control soaking time to be 30-80min, to cause martensite microstructure to be formed back under high temperature temper condition
Fiery sorbite microstructure, so as to make the steel pipe with the microstructure be had concurrently while possessing higher-strength, also preferably
The comprehensive mechanical property such as toughness and plasticity.
Again because the temperature of the high tempering in adjustment heat treatment step is relatively low, soaking time is relatively short, therefore
The iron scale of steel tube surface formation is that can remove by follow-up high-pressure water descaling process, and iron oxide will not be produced on steel pipe
Skin is adhered to.
Furthermore, there is serious flexural deformation to be effectively prevented from steel pipe, thermal straightening temperature controlled in thermal straightening process
Spend for 500-600 DEG C.
Further, the manufacture method of steel pipe of the present invention also includes step (8) welding：Using gas shielded arc
Weldering will be welded after some sections of steel pipe docking, and welding wire deposited metal tensile strength is not less than 960MPa, to ensure that welding point has
Higher tensile strength, 90-150 DEG C of preheating temperature, to prevent steel pipe from HAZ cold cracks occur.
Further, in above-mentioned steps (2), firing rate 9-11min/cm is controlled, soaking temperature is 1220-1240 DEG C
And insulation 60-120min.
Once inventor has found that soaking temperature reaches more than 1250 DEG C in heating stepses, the viscosity of steel pipe iron scale is just
Increase, even if iron scale can not be got rid of by high pressure water impact.Therefore, soaking temperature control is existed in heating stepses
Between 1220-1240 DEG C, so, iron scale can be removed by water under high pressure substantially, so as to improve the surface quality of steel pipe.
Further, in above-mentioned steps (3), control high-pressure water pressure is more than 10MPa, is imitated with obtaining good de-scaling
Really, i.e., the iron scale for being formed at steel tube surface is effectively removed, mass defect is produced to avoid it from being pressed into steel tube surface, from
And improve the surface quality of tube product.In the technical program, control high-pressure water pressure refers to high-pressure water pressure more than 10MPa
The technical program can be just realized higher than 10MPa, and is not controlled in the upper-bound theory of high-pressure water pressure.But, ability
Technical staff in domain knows, the reason for for economical and energy saving, and the upper limit typically also will not be unconfined height, should be in production
In permission or achievable scope.
Further, in above-mentioned steps (4), it is 950-1050 DEG C to control finish to gauge rolling temperature.
The purpose between 950-1050 DEG C is controlled to be the austenite crystal hot rolling for causing deformation finish to gauge rolling temperature
Complete dynamic recrystallization in time afterwards, and form uniform tiny equiax crystal, then obtain and uniformly roll state tissue, be at subsequent thermal
Reason obtains excellent performance and provides organizational structures.
Further, in above-mentioned steps (6), control high-pressure water pressure is more than 6MPa, to obtain good scale removal effect,
The iron scale for being formed at steel tube surface is effectively removed, mass defect is produced to avoid it from being pressed into steel tube surface, so that
Improve the surface quality of tube product.In the technical program, control high-pressure water pressure refers to that high-pressure water pressure is high more than 6MPa
The technical program can be just realized in 6MPa, and is not controlled in the upper-bound theory of high-pressure water pressure.But, in the art
Technical staff know that the reason for for economical and energy saving, the upper limit typically also will not be unconfined height, should allow in production
Or in achievable scope.
The intensity of 890MPa grade high-strengths steel of the present invention is high, and its yield strength is more than 890MPa and tensile strength is big
In 960MPa.
In addition, 890MPa grade high-strengths steel of the present invention has excellent low-temperature flexibility and excellent weldability concurrently
Can, the low-temperature impact toughness at its -40 DEG C is more than 100J.
In addition, compared to existing high strength steel, the W content of 890MPa grade high-strengths steel of the present invention is reduced, Ni
Content increase, advantageously avoid steel plate bending, improves steel-plate shape, efficiently avoid iron scale attachment, improves
The surface quality of steel plate.
Steel pipe of the present invention has higher intensity, good low-temperature flexibility and excellent welding performance, its mother metal
Yield strength is more than 890MPa, and the low-temperature impact toughness that tensile strength is more than at 960MPa, -40 DEG C is more than 100J, after welding
Welding point tensile strength is more than 960MPa, and the low-temperature flexibility of heat affected area reaches more than 80J.
Intensity height can be obtained by the manufacture method of steel pipe of the present invention, quenching degree is good, and low-temperature flexibility can be excellent
The excellent steel pipe of good and welding performance.
In addition, the excellent surface quality of the steel pipe obtained by the manufacture method of steel pipe of the present invention, steel pipe pipe fitting
It is not flexible.
In addition, the manufacture method of steel pipe of the present invention is suitable for manufacturing the thicker steel pipe of tube wall.
Brief description of the drawings
Fig. 1 is the shape appearance figure of the iron scale of embodiment A1 steel tube surface.
Fig. 2 is the shape appearance figure of the iron scale of comparative example B1 steel tube surface.
Fig. 3 is the shape appearance figure of the iron scale of comparative example B2 steel tube surface.
Embodiment
890MPa grade high-strengths steel of the present invention, steel pipe and its manufacture method will be done according to specific embodiment below
Go out to further illustrate, but specific embodiment and related description do not constitute the improper restriction for technical scheme.
Embodiment A1-A7 and comparative example B1-B4
The steel pipe in embodiment and comparative example is manufactured as steps described below, it includes：
(1) make steel：Refining, vacuum outgas are smelted, and controls the percent mass proportioning such as table 1 of each chemical element in molten steel
It is shown；
(2) it is cast into round billet；
(3) round billet is heated：Firing rate 9-11min/cm is controlled, soaking temperature is 1220-1240 DEG C and insulation 60-
120min；
(4) high-pressure water descaling：High-pressure water pressure is controlled to be more than 10MPa；
(5) tube rolling：Perforation tube rolling, rolls rear air cooling and carries out sawing, and it is 950-1050 DEG C to control finish to gauge rolling temperature；
(6) Tempering and Quenching：Hardening heat is 880-930 DEG C, and soaking time is 30-60min, then water quenching.In 580-
650 DEG C of progress high temperings, soaking time is 30-80min, to ensure that steel pipe obtains good comprehensive mechanical property；
(7) high-pressure water descaling：High-pressure water pressure is controlled to be more than 6MPa；
(8) thermal straightening：Thermal straightening temperature control is 500-600 DEG C；
(9) weld：It will be welded using gas shielded arc welding after some sections of steel pipe docking, welding wire deposited metal tensile strength
Not less than 960MPa, 90-150 DEG C of preheating temperature, to prevent steel pipe from HAZ cold cracks occur.
Specific process parameter is referring particularly to table 2 in above steps.
The quality percentage that table 1 lists each chemical element in embodiment A1-A7 and comparative example B1-B4 steel pipe is matched somebody with somebody
Than.
Table 1. (wt.%, surplus is Fe and other inevitable impurity in addition to P and S)
* note：Relational expression is：5<Ni/ (C*Mo), Ceq=C+Mn/6+ (Cr+Mo+V)/5+Ni/15.
Table 2 lists the technological parameter of the manufacture method of embodiment A1-A7 and comparative example B1-B4 steel pipe.
Table 2.
At room temperature, for being measured after embodiment A1-A7 and comparative example B1-B4 samplings, wherein, for above-mentioned steel pipe
Welding point carry out -40 DEG C of pendulum impact tests, to determine the impact property of its heat affected area, and by related mechanical property
Energy parameter is listed in Table 3 below.
Table 3 lists the mechanical property parameters of embodiment A1-A7 and the steel pipe in comparative example B1-B4.
Table 3.
From table 3 it is observed that embodiment A1-A7 yield strengths >=948MPa, tensile strength >=998MPa, extension
Rate >=15%, impact flexibility (- 40 DEG C) AKv >=106J, HAZ toughness (- 40 DEG C) AKv >=84J, welding point tensile strength >=
985MPa, it can be seen that, the yield strength of the steel pipe in above-described embodiment is both greater than 890MPa, and tensile strength is both greater than
960MPa, the HAZ impact flexibility that the low-temperature impact toughness at -40 DEG C is both greater than at 100J, -40 DEG C is both greater than 80J, so as to illustrate
The steel pipe of this case possesses higher intensity, while with excellent low-temperature flexibility, good plasticity and excellent welding performance.
Review, have chemical element in comparative example B1-B4 steel pipe beyond scope, specifically, the C element in comparative example B1, contrast
Scope of the Mo elements beyond restriction in Ni elements in example B2, comparative example B3-B4, even if comparative example B1-B4 uses phase
With technological parameter, and the technological parameter is not departing from the scope of restriction, but the intensity of comparative example B1-B4 steel pipe or tough
Property index and not up to this case requirement level.Wherein, comparative example B1, B3 and B4 mother metal tensile strength and welding point tension
Intensity is no more than 960MPa, and comparative example B3 and B4 mother metal yield strength are also not reaching to 890MPa grades of levels, comparative example B2
Impact flexibility (- 40 DEG C) AKv then be only 27J, HAZ toughness (- 40 DEG C) AKv is only 15J.
To natural cooling after embodiment A1, comparative example B1 and comparative example B2 sampling heating, embodiment and contrast are observed respectively
The pattern of the iron scale of example.
Fig. 1, Fig. 2 and Fig. 3 respectively illustrate the iron scale of embodiment A1, comparative example B1 and comparative example B2 steel tube surface
Pattern.
As shown in figure 1, referring to table 1 if necessary, the outer oxide iron sheet of embodiment A1 steel tube surface is loose porous, internal layer
Adhesion layer is relatively thin, is got rid of easily by high pressure water impact.
As shown in Fig. 2 if necessary refer to table 1, due to comparative example B1 Ni/ (C*Mo) be 65, its more than 50, that is,
Say, the proportion relation between Ni elements and C, Mo does not meet the restriction of relational expression, therefore, the internal layer of comparative example B1 steel tube surface
Adhesion layer is thicker, is also difficult to clean off being attached to the iron scale of steel tube surface even with high pressure water impact.
As shown in figure 3, referring to table 1 if necessary, although comparative example B2 internal layer adhesion layer is relatively thin, easily by high pressure water flushing
Hit and dispose, but be due to that Ni elements do not meet relation beyond the proportion relation limited between scope, and Ni elements and C, Mo
The restriction of formula, therefore, comparative example B2 low-temperature flexibility and HAZ toughness are relatively low, do not meet the mechanical property water that this case requirement reaches
It is flat.
The manufacture method of steel pipe of the present invention is especially suitable for the thicker steel pipe of manufacture tube wall, and the steel pipe can be made
To carry the manufacturing field that the structural steel pipe of top load is applied to correlation.
It should be noted that listed above is only specific embodiment of the invention, it is clear that real the invention is not restricted to more than
Example is applied, the similar change for having many therewith.If those skilled in the art directly exported from present disclosure or
All deformations associated, all should belong to protection scope of the present invention.
Claims (11)
1. a kind of 890MPa grade high-strengths steel, its chemical elements in percentage by mass is：C：0.12-0.18%, Si：0.1-
0.4%, Mn：0.8-1.4%, Cr：0.5-0.9%, Mo：0.20-0.60%, W：0.01-0.08%, Ni：0.50-1.30%,
Nb：0.01-0.06%, V：0.03-0.12%, Al：0.01-0.05%, Ca：0.0005-0.005%, while also meeting as follows
Relational expression：5<Ni/ (C*Mo)≤50, surplus is Fe and other inevitable impurity.
2. 890MPa grade high-strengths steel as claimed in claim 1, it is characterised in that its microstructure is tempered sorbite.
3. 890MPa grade high-strengths steel as claimed in claim 1, it is characterised in that its carbon equivalent Ceq=C+Mn/6+ (Cr+Mo
+V)/5+Ni/15≤0.65。
4. 890MPa grade high-strengths steel as claimed in claim 1, it is characterised in that its yield strength is more than 890MPa, tension
Intensity is more than 100J more than the low-temperature impact toughness at 960MPa, -40 DEG C.
5. a kind of steel pipe, it uses the 890MPa grade high-strength steels as described in any one in claim 1-4 to obtain.
6. the manufacture method of steel pipe as claimed in claim 5, it is characterised in that including step：
(1) make steel and be cast into round billet；
(2) round billet is heated；
(3) high-pressure water descaling；
(4) tube rolling, rolls rear air cooling；
(5) Tempering and Quenching：Hardening heat is 880-930 DEG C, and soaking time is 30-60min, then water quenching, at 580-650 DEG C
High tempering is carried out, soaking time is 30-80min；
(6) high-pressure water descaling；
(7) thermal straightening：Thermal straightening temperature control is 500-600 DEG C.
7. the manufacture method of steel pipe as claimed in claim 6, it is characterised in that also welded including step (8)：Protected using gas
Protecting arc welding will weld after some sections of steel pipe docking, and welding wire deposited metal tensile strength is not less than 960MPa, preheating temperature 90-
150℃。
8. the manufacture method of steel pipe as claimed in claims 6 or 7, it is characterised in that in the step (2), control heating
Speed 9-11min/cm, soaking temperature is 1220-1240 DEG C and insulation 60-120min.
9. the manufacture method of steel pipe as claimed in claims 6 or 7, it is characterised in that in the step (3), controls high pressure
Water pressure is more than 10MPa.
10. the manufacture method of steel pipe as claimed in claims 6 or 7, it is characterised in that in the step (4), controls finish to gauge
Rolling temperature is 950-1050 DEG C.
11. the manufacture method of steel pipe as claimed in claims 6 or 7, it is characterised in that in the step (6), controls high pressure
Water pressure is more than 6MPa.
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| CN110317994B (en) * | 2018-03-30 | 2021-12-17 | 宝山钢铁股份有限公司 | Ultrahigh-strength steel for high heat input welding and manufacturing method thereof |
| CN111748727B (en) * | 2019-03-27 | 2022-01-14 | 宝山钢铁股份有限公司 | Ultrahigh-strength seamless steel pipe with excellent weldability and manufacturing method thereof |
| CN112553526B (en) * | 2020-11-20 | 2022-04-22 | 林州凤宝管业有限公司 | 960 MPa-level ultrahigh-strength structural steel, steel pipe and manufacturing method and application thereof |
| CN113106347B (en) * | 2021-04-13 | 2022-07-15 | 无锡恒丰祥钢管科技有限公司 | High-temperature-resistant seamless steel tube and preparation method thereof |
| CN114892085B (en) * | 2022-05-06 | 2023-03-03 | 鞍钢股份有限公司 | Wide and thick steel plate for advanced nuclear power unit positioning and manufacturing method thereof |
| CN115948699A (en) * | 2022-12-05 | 2023-04-11 | 南京钢铁股份有限公司 | Manufacturing method of 800 MPa-grade high-strength steel plate for stress corrosion resistant spherical tank |
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