CN108251747A - Crane arm support steel pipe and its manufacturing method - Google Patents
Crane arm support steel pipe and its manufacturing method Download PDFInfo
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- CN108251747A CN108251747A CN201810112600.5A CN201810112600A CN108251747A CN 108251747 A CN108251747 A CN 108251747A CN 201810112600 A CN201810112600 A CN 201810112600A CN 108251747 A CN108251747 A CN 108251747A
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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
-
- 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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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Abstract
The present invention provides a kind of crane arm support steel pipe and its manufacturing methods.By weight percentage, steel pipe includes 0.10~0.20% C element, 0.10~0.90% Si elements, 0.008~0.070% Al elements, 0.80~3.60% Cr elements, 0.40~1.80% Mo elements, 0.03~0.16% V element, 0.03~0.35% Nb elements, 0.10~1.50% W elements and 0~0.005% N element, and surplus is Fe elements and inevitable impurity.Under the premise of the alloying element that the present invention easily makes steel tube surface generate dense oxide iron sheet and the bending of water quenching process in stringent control, steel pipe is made to reach 960 grade of steel intensity and toughness reguirements by the carbide of microalloy element and the disperse educt of nitride, make steel pipe that there is good surface quality, straightness, excellent low-temperature flexibility and weldability.
Description
Technical field
The present invention relates to crane gib arm rack pipe technical field, in particular to a kind of crane arm support steel pipe and
Its manufacturing method.
Background technology
Crawler crane is the flow-type that hoisting operation device is mounted on crawler body, is walked by crawler attachment
Crane can carry out the operations such as material lifting, transport, handling and installation, with elevating capacity is big, grounding pressure is small, turning
Radius is small, overline capable of hoisting is walked, to environmental requirement, there are many advantages that combination for low, arm support.Crane arm support is by the seamless of 3~12m
Steel pipe one is welded and is composed successively, is crawler crane carrying and transfer, the critical component of hoisting heavy, therefore crane
Arm rack pipe will not only have high intensity, high tenacity, while must also have good welding performance.
In recent years, as national basis Facilities Construction is medium-and-large-sized, the increase of ultra-large type project under construction quantity, crawler crane
Exploitation gradually develop towards adverse circumstances directions such as large-tonnage, super-tonnage and the ultralow temperature that is applicable in extremely cold area.In complete machine
In weight, arm support occupies larger proportion, and excessive arm support dead weight will serious limitation complete machine elevating capacity, this is just to big
Tonnage, super-tonnage crane main chord propose higher requirement with pipe.Using high intensity, high tenacity, superb low-temperature impact
Arm support dead weight can be not only greatly reduced in the steel pipe of toughness and good welds performance, improve lifting weight, and can guarantee in pole
Job safety in the ultralow temperature adverse circumstances in area of trembling with fear under pressure effect.Therefore exploitation yield strength reaches 960MPa ranks
High-strength and high ductility arm support pipe plays the role of large-tonnage, super-tonnage crawler crane positive.
It is mostly produced both at home and abroad using the C-Mn-W-V series low carbon high-strength steel with sufficient intensity and good welds performance
Heavy-duty machine arm rack pipe.At present, the highest arm support pipe for reaching 890MPa ranks for yield strength of arm support tube material intensity rank, and
And general tube material, with the raising of intensity, toughness has a degree of weakening, as yield strength is more than 960MPa, steel
The toughness index of kind is often more difficult to reach, while the alloying level higher of 960 grade of steel arm support pipes leads to iron scale more
It is fine and close and be difficult to remove.Moreover, steel strength higher, straightener is more difficult to align.So ensure that good straightness is also 960
One of production problem of grade of steel arm support pipe.Therefore, good obdurability matching, excellent surface quality and straightness are 960MPa
The technology of more than grade of steel crane gib arm rack pipe and production problem.
Invention content
It is a primary object of the present invention to provide a kind of crane arm support steel pipe and its manufacturing method, to solve existing skill
Crane arm support steel pipe in the art toughness after yield strength is more than 960MPa is excessively poor, and steel tube surface quality and straightness compared with
The problem of poor.
To achieve these goals, according to an aspect of the invention, there is provided a kind of crane arm support steel pipe, by weight
Percentages are measured, crane arm support includes 0.10~0.20% C element, 0.10~0.90% Si elements, 0.008 with steel pipe
~0.070% Al elements, 0.80~3.60% Cr elements, 0.40~1.80% Mo elements, 0.03~0.16% V members
Element, 0.03~0.35% Nb elements, 0.10~1.50% W elements and 0~0.005% N element, and surplus is Fe elements
With inevitable impurity.
Further, by weight percentage, crane arm support further includes 0.2~1.50% Ni elements with steel pipe.
Further, by weight percentage, crane arm support includes 0.11~0.15% C element, 0.28 with steel pipe
~0.76% Si elements, 0.023~0.060% Al elements, 0.90~1.20% Cr elements, 0.50~0.60% Mo
Element, 0.056~0.12% V element, 0.039~0.12% Nb elements, 0.565~1.23% W elements, 0.34~
1.32% Ni elements and 0~0.005% N element, and surplus is Fe elements and inevitable impurity；Preferably, W members
Weight ratio between element, Nb elements, V element and Al elements is 20~24:1.8~2:2~2.2:1.
Further, by weight percentage, crane arm support further includes 1.00~2.50% Mn elements with steel pipe, excellent
Choosing includes 1.10~1.41% Mn elements.
Further, crane arm support further includes P element, S elements, O elements, H element and As elements with steel pipe, and presses
The weight percent meter of heavy-duty machine arm support steel pipe, content≤0.010%, O element of content≤0.020%, S element of P element
Content≤0.003%, content≤0.0002% of H element, and content≤0.025% of As elements.
Further, crane arm support further includes Sn elements, Pb elements, Sb elements and Bi elements with steel pipe, and Sn elements,
The sum of the weight percent of Pb elements, Sb elements, Bi elements and As elements in crane arm support steel pipe≤0.05%.
Further, the weight content of C element is denoted as a by carbon equivalent Ceq≤0.75% of crane arm support steel pipe,
The weight content of Mn elements is denoted as b, the weight content of Cr elements is denoted as c, the weight content of Mo elements is denoted as d, by V members
The weight content of element is denoted as e, and the weight content of Ni elements is denoted as f, wherein Ceq=a+b/6+ (c+d+e)/5+f/15.
According to another aspect of the present invention, a kind of manufacturing method of above-mentioned crane arm support steel pipe is additionally provided, is wrapped
Include following steps：Dispensing is carried out according to the chemical composition of crane arm support steel pipe, obtains mixed raw material；Mixed raw material is carried out
It smelts, casting, obtains blank；Blank is rolled, obtains hot-rolled pipe；Hot-rolled pipe is subjected to Tempering and Quenching, obtains hot place
Reason pipe；And align heat treatment pipe, obtain crane arm support steel pipe.
Further, the process that blank rolls is included：Blank is heated to 1230~1280 DEG C in annular furnace,
Obtain hot base；To hot base into eleven punch 11, hollow billet is obtained；Hollow billet is rolled into hollow forging, then by hollow forging sizing, obtains hot-rolled pipe.
Further, the process of blank heating is included：Blank is preheated successively, heat up heating and soaking, obtain
Hot base, and by the total time of blank heating >=190min；Preferably, the process of preheating includes：Blank is preheated with furnace temperature；
The process of heating includes five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating successively, wherein one section of heating
Temperature for 1024 ± 10 DEG C, heating time >=30min；The temperature of two sections of heating is 1138 ± 10 DEG C, heating time >=
40min；The temperature of three sections of heating is 1250 ± 10 DEG C, heating time >=20min；The temperature of four sections of heating is 1267 ± 10 DEG C,
Heating time >=20min；The temperature of five sections of heating is 1263 ± 10 DEG C, heating time >=20min；During soaking, soaking
Temperature is 1260 ± 10 DEG C, heating time >=40min.
Further, the step of hot-rolled pipe being carried out Tempering and Quenching includes：At a temperature of 900~1100 DEG C, by hot rolling
Pipe is kept the temperature, then the hot-rolled pipe after heat preservation is quenched successively, first time de-scaling, surface water-spraying control, obtain first
Handle steel pipe；Preferably, de-scaling water pressure >=25MPa of first time de-scaling；At a temperature of 500~600 DEG C, to the first processing steel
Pipe carries out first time tempering, then carries out second of de-scaling, air cooling, obtains second processing steel pipe；Preferably, it removes for the second time
De-scaling water pressure >=20MPa of squama；And at a temperature of 600~730 DEG C, second is carried out to second processing steel pipe and is tempered, so
Third time de-scaling, air cooling are carried out afterwards, obtain heat treatment pipe；Preferably, de-scaling water pressure >=20MPa of third time de-scaling.
Further, the step of smelting includes：Mixed raw material is subjected to electric furnace smelting and external refining successively；Preferably,
The step of casting, includes：Mixed raw material after smelting is subjected to arc continuous casting, obtains blank；It is highly preferred that before arc continuous casting,
Manufacturing method further includes the step of carrying out vacuum outgas to the mixed raw material after smelting.
Further, using whole ar blowing refining technique during external refining, and carbonization is added in refinery systems
Calcium, aluminum shot and carbon dust carry out deoxidation；Preferably, the step of vacuum outgas includes：By the mixed raw material after smelting in vacuum condition
Lower holding 20min or more；Preferably, in the step of arc continuous casting, casting speed be 0.8~1.0m/min, the degree of superheat 35
~44 DEG C.
Further, during heat treatment pipe is aligned, straightening temperature is 600~700 DEG C.
The present invention provides a kind of crane arm support steel pipes, and by weight percentage, crane arm support is included with steel pipe
0.10~0.20% C element, 0.10~0.90% Si elements, 0.008~0.070% Al elements, 0.80~3.60%
Cr elements, 0.40~1.80% Mo elements, 0.03~0.16% V element, 0.03~0.35% Nb elements, 0.10~
1.50% W elements and 0~0.005% N element, and surplus is Fe elements and inevitable impurity.
Crane arm support steel pipe provided by the invention, yield strength have reached the rank of more than 960MPa.It is also, logical
Cross the suitably microalloy elements such as alloying elements and Nb, V, Al such as addition Cr, Mo, W, and pass through Cr, Mo, W, Nb, V, Al, C
Synergistic effect between N element easily makes steel tube surface generate dense oxide iron sheet and the bending of water quenching process in stringent control
Under the premise of alloying element, steel pipe is made to reach 960 grade of steels by the carbide of microalloy element and the disperse educt of nitride strong
Degree and toughness reguirements, not only make steel pipe be not likely to produce dense oxide iron sheet and bending in process of production, have good surface
Quality and straightness, and make steel pipe that also there is excellent low-temperature flexibility and weldability while having superhigh intensity.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.Below in conjunction with embodiment, the present invention will be described in detail.
The application is described in further detail below in conjunction with specific embodiment, these embodiments are it is not intended that limit this
Apply for range claimed.
As background technology part is described, crane arm support of the prior art is more than in yield strength with steel pipe
Toughness is excessively poor after 960MPa, and steel tube surface quality and straightness are poor.
To solve the above-mentioned problems, the present invention provides a kind of crane arm support steel pipes, by weight percentage, packet
Include 0.10~0.20% C element, 0.10~0.90% Si elements, 0.008~0.070% Al elements, 0.80~
3.60% Cr elements, 0.40~1.80% Mo elements, 0.03~0.16% V element, 0.03~0.35% Nb elements,
0.10~1.50% W elements and 0~0.005% N element, and surplus is Fe elements and inevitable impurity.
Crane arm support steel pipe provided by the invention, yield strength have reached the rank of more than 960MPa.It is also, logical
Cross the suitably microalloy elements such as alloying elements and Nb, V, Al such as addition Cr, Mo, W, and pass through Cr, Mo, W, Nb, V, Al, C
Synergistic effect between N element easily makes steel tube surface generate dense oxide iron sheet and the bending of water quenching process in stringent control
Under the premise of alloying element, steel pipe is made to reach 960 grade of steels by the carbide of microalloy element and the disperse educt of nitride strong
Degree and toughness reguirements, not only make steel pipe be not likely to produce dense oxide iron sheet and bending in process of production, have good surface
Quality and straightness, and make steel pipe that also there is excellent low-temperature flexibility and weldability while having superhigh intensity.
C is carbide former, can effectively improve the intensity and quenching degree of steel, the intensity of steel with the increase of carbon content and
Improve, but impact flexibility and elongation percentage are then decreased obviously, especially unfavorable to welding performance, therefore, C content control 0.10~
0.20, the intensity and toughness of steel can be not only kept, but also welding performance will not be had adverse effect on.Si is that deoxidation has in steel
Element is imitated, and delta ferrite can be inhibited to crystallize, the toughness of seamless steel pipe can be improved.Meanwhile silicon can exist in the form of solid solution
In ferrite or austenite, the intensity of solid solution is improved, therefore the intensity of steel can be improved.But silicone content is excessively high, can be notable
Reduce toughness, plasticity and the ductility of steel.Therefore, the present invention is conducive to balance by the control of the content of Si 0.10~0.90%
The toughness and tenacity of steel pipe.
Al is good deoxidier in steel, can with Si coordinate removing raw material in oxygen, and can generate height it is fine crushing,
The oxide of submicroscopic, crystal grain is grown up when can effectively prevent the steel from heating, being capable of crystal grain thinning.Since the deoxidation effect of Al is satisfied
With and field trash is avoided to occur in the form of bulk, while adding in Li-adding Al alloy excessive Al can make steel tube surface form one layer
More fine and close iron scale is not easy to remove under high pressure water.Therefore, the present invention by the control of Al content 0.008~
0.070%, be conducive on the basis of excellent surface quality is kept crystal grain thinning as possible, improve the tough balance of steel pipe.
Cr is carbide former, can improve the intensity and quenching degree of steel pipe, while the complex carbon that Cr and Fe is formed
Compound is tiny and indissoluble solution, crystal grain thinning and can improve temper resistance, but Cr can excessively significantly improve the Transition of Brittleness of steel
Temperature and the low-temperature impact toughness for reducing steel.Mo can improve the quenching degree of steel, and by forming Dispersed precipitate on crystal boundary
Carbide come improve the intensity of steel, crystal grain thinning and improve steel belt roof bolt stability, can reduce or other elements is inhibited to be led
The temper brittleness of cause so significantly improving the impact flexibility of steel simultaneously in the intensity for improving steel, while is more than 800 DEG C in temperature
Volatile molybdenum trioxide is formed in environment, makes the compact iron oxide film to be formed loose porous, so as to be easy to shell under high pressure water
Fall, but not notable to improving the effect of impact flexibility during Mo too high levels, at the same it is excessively high when can also reduce the toughness of steel.
V easy and C, N in steel form extremely stable carbide and nitride, and vanadium carbide and vanadium nitride lead in steel
Often exist in the form of tiny, disperse, so the tissue and crystal grain of steel can be refined significantly, improve grain coarsening temperature, drop
The superheated susceptivity of low steel, so as to improve the intensity and toughness of steel, while can be formed in drawing process when the content is higher simultaneously
Post-curing phenomenon, but vanadium carbide and vanadium nitride can be precipitated in intra-die the toughness of steel be caused to reduce when V content is excessively high.Nb is
A kind of strong Grain refinement element, can form carbide, improve the thermal stability of steel, make blank in heating period austenite
Crystal grain is unlikely to the excessively coarse of growth, makes to make the crystal grain of steel further to refine in subsequent rolling, improves the intensity of steel
And toughness.In drawing process, it is precipitated with highly dispersed [Nb] C, plays the effect of precipitation strength, ensure that the surrender of material is strong
With excellent low-temperature impact toughness while degree reaches 960MPa, and reduce the brittle transition temperature of steel grade and improve weldability
Energy.
W is a kind of fusing point height and carbide, and form special carbide with carbon is dissolved difficult, expense in steel
When, therefore steel belt roof bolt stability and heat resistance can be increased, the heat sensitivity of steel is reduced, and W is notable in solid solution condition
The quenched temper resistance of steel is improved, the alloy carbide W of tungsten during tempering2C disperse educts will promote steel to occur significant two
Underhardening acts on, but when W content is excessively high can fix excessive carbon, so that the carbon content that part is dissolved in austenite is poor, drop
The quenching degree and hardenability of low steel.N is combined to form carbon, oxide together with C with Al, Nb and Ti, and the carbon, oxide are present in crystalline substance
Boundary can play the role of notable crystal grain thinning, so as to improve the toughness of material.
In short, the present invention is coordinated by the dosage between each alloying element and microalloy element, play in large quantities to the greatest extent a
Comprehensive function between element makes crane arm support steel pipe still have excellent toughness after yield strength is more than 960MPa,
And steel tube surface quality and straightness have and largely improve.
In a preferred embodiment, by weight percentage, crane arm support further include 0.2 with steel pipe~
1.50% Ni elements.Ni is a kind of main alloy element formed with stable austenite, can be existed with the form that Fe dissolves each other
Yu Gangzhong and the intensity for improving steel, while improve the low-temperature flexibility of steel by refining the crystal grain of α phases and reduce the black brittleness of steel
Transition temperature, this to 960 grade of steel arm support pipes at low temperature even under ultralow temperature using there is epochmaking effect.And by Ni elements
Content controls within the above range, can not only further improve the cryogenic property of steel pipe, and also be able to make its holding good
Welding performance.
In order to further integrate the performance of steel pipe various aspects, in a preferred embodiment, by weight percentage,
Crane arm support included with steel pipe 0.11~0.15% C element, 0.28~0.76% Si elements, 0.023~0.060%
Al elements, 0.90~1.20% Cr elements, 0.50~0.60% Mo elements, 0.056~0.12% V element, 0.039~
0.12% Nb elements, 0.565~1.23% W elements, 0.34~1.32% Ni elements and 0~0.005% N element,
And surplus is Fe elements and inevitable impurity.
It is highly preferred that the weight ratio between W elements, Nb elements, V element and Al elements is 20~24:1.8~2:2~
2.2:1.It, can be when being tempered first time in steel pipe preparation process after the collaboration addition of the elements such as W, Nb, V, Al of above-mentioned dosage
Disperse educt is formed, generates temper hardening, so as to be conducive to improve temperature when being tempered second, and then advantageously reduce
Aligning drag during aligning, to effectively improve straightness.The particularly following preparation processes of the invention of cooperation at this time, can be further
Improve the comprehensive performance of steel pipe.
In a preferred embodiment, by weight percentage, crane arm support further include 1.00 with steel pipe~
2.50% Mn elements preferably include 1.10~1.41% Mn elements.Mn is austenite former, can improve seamless steel
The intensity of pipe, and the quenching degree of steel pipe can be improved and reduce hardening heat, while there is deoxidation and desulfurization, sulphur can be weakened
Harmful effect.The present invention controls its content within the above range, not only improves the intensity for further improving steel pipe, additionally it is possible to make
Steel pipe keeps crystal grain refinement and good low temperature impact properties.
In seamless steel pipe preparation process, inevitably introduce some impurity elements, implement a kind of preferred
In mode, crane arm support further includes P element, S elements, O elements, H element and As elements, and use by crane arm support with steel pipe
The weight percent meter of steel pipe, the content of content≤0.010%, O element of content≤0.020%, S element of P element≤
0.003%, content≤0.0002% of H element, and content≤0.025% of As elements.The content control of these elements is existed
In above range, the influence of impurity element can be reduced to the greatest extent.
In order to further improve the performance of above-mentioned steel pipe, in a preferred embodiment, crane arm support steel pipe
Sn elements, Pb elements, Sb elements and Bi elements are further included, and Sn elements, Pb elements, Sb elements, Bi elements and As elements are rising
The sum of weight percent in heavy-duty machine arm support steel pipe≤0.05%.
In a preferred embodiment, carbon equivalent Ceq≤0.75% of crane arm support steel pipe, by C element
Weight content is denoted as a, and the weight content of Mn elements is denoted as b, and the weight content of Cr elements is denoted as c, by the weight of Mo elements
Content is denoted as d, and the weight content of V element is denoted as e, and the weight content of Ni elements is denoted as f, wherein Ceq=a+b/6+ (c+d+
e)/5+f/15.By carbon equivalent control within the above range, seamless steel pipe has more excellent performance.
According to another aspect of the present invention, additionally provide a kind of manufacturing method of crane arm support steel pipe, including with
Lower step：Dispensing is carried out according to the chemical composition of crane arm support steel pipe, obtains mixed raw material；Mixed raw material is subjected to smelting
Refining, casting, obtain blank；Blank is rolled, obtains hot-rolled pipe；Hot-rolled pipe is subjected to Tempering and Quenching, is heat-treated
Pipe；And align heat treatment pipe, obtain crane arm support steel pipe.
The crane arm support steel pipe formed using above-mentioned manufacturing method, yield strength have reached the grade of more than 960MPa
Not.Also, by suitably adding the microalloy elements such as the alloying elements such as Cr, Mo, W and Nb, V, Al, and pass through Cr, Mo, W,
Synergistic effect between Nb, V, Al, C and N element easily makes steel tube surface generate dense oxide iron sheet and water quenching in stringent control
Under the premise of the alloying element of journey bending, reach steel pipe by the carbide of microalloy element and the disperse educt of nitride
960 grade of steel intensity and toughness reguirements, not only make steel pipe be not likely to produce dense oxide iron sheet and bending in process of production, have good
Good surface quality and straightness, and make steel pipe that also there is excellent low-temperature flexibility and solderable while having superhigh intensity
Connecing property.
The present invention is further economy, produces seamless steel pipe in bulk and improves the quality of blank and control impurity element
Content, it is preferred that dispensing include molten iron, tube head, pure material, high-quality steel scrap, ferroalloy and aluminium in it is a variety of and control steel scrap
Usage amount, ensure high-quality molten iron addition >=60%.
In a preferred embodiment, the process that blank rolls is included：Blank is heated in annular furnace
To 1230~1280 DEG C, hot base is obtained；To hot base into eleven punch 11, hollow billet is obtained；Hollow billet is rolled into hollow forging, then determines hollow forging
Diameter obtains hot-rolled pipe.
In a preferred embodiment, the process of blank heating is included：Blank is preheated successively, heating up adds
Heat and soaking, obtain hot base, and by the total time of blank heating >=190min.Heat stepwise, and by the total time of blank heating
It controls in >=190min, is conducive to that blank is made more fully to heat.
Preferably, the process of preheating includes：Blank is preheated with furnace temperature；The process of heating includes heating one successively
Five sections of section, two sections of heating, three sections of heating, four sections of heating and heating, wherein the temperature of one section of heating is 1024 ± 10 DEG C, during heating
Between >=30min；The temperature of two sections of heating is 1138 ± 10 DEG C, heating time >=40min；The temperature of three sections of heating is 1250 ± 10
DEG C, heating time >=20min；The temperature of four sections of heating is 1267 ± 10 DEG C, heating time >=20min；The temperature of five sections of heating
It is 1263 ± 10 DEG C, heating time >=20min；During soaking, soaking temperature is 1260 ± 10 DEG C, heating time >=
40min.By above-mentioned heat stepwise, pipe can be made to be gradually increased to set temperature, pipe is fully heated, while advantageous
Too fast hot finished steel pipe is caused to crack defect in avoiding heating up.
In a preferred embodiment, the step of hot-rolled pipe being carried out Tempering and Quenching includes：At 900~1100 DEG C
At a temperature of, hot-rolled pipe is kept the temperature and (preferably keeps the temperature 60~90min), then the hot-rolled pipe after heat preservation is quenched successively,
First time de-scaling, surface water-spraying control obtain the first processing steel pipe；Preferably, the de-scaling water pressure of first time de-scaling >=
25MPa；At a temperature of 500~600 DEG C, first time tempering is carried out to the first processing steel pipe, then carries out second of de-scaling, air
Cooling, obtains second processing steel pipe；Preferably, de-scaling water pressure >=20MPa of second of de-scaling；And in 600~730 DEG C of temperature
Under degree, second is carried out to second processing steel pipe and is tempered, then carries out third time de-scaling, air cooling, obtains heat treatment pipe；It is excellent
Selection of land, de-scaling water pressure >=20MPa of third time de-scaling.
60~90min is kept the temperature at 900~1100 DEG C, is conducive to promote each alloying element (especially tungsten carbide of indissoluble
Particle) more sufficiently and uniformly it is dissolved in austenite grain, be conducive to the uniformity of austenitizing and subsequent seamless steel pipe
Quench cooling effect；Postcooling when using inside and outside water injection system, can ensure the adequacy and uniformity of martensite transfor mation.Two
The alloy carbide W of the tungsten for the Dispersed precipitate being precipitated during first time lonneal in steel grade of the present invention is utilized in secondary tempering process2C
And the age hardening effect that the carbide and nitride of Nb, V generate steel improves secondary temperature, so as to improve
The temperature straight with temperature correction carried out therewith after second of tempering, the resistance of deformation of steel pipe when reducing aligning are finally ensureing performance
The straightness of the superhigh intensity arm support pipe of 960 ranks is improved under the premise of qualification.Steel pipe go out glowing furnace and it is secondary go out tempering furnace
The surface quality of arm support pipe is repeatedly improved by high-pressure water descaling by high-pressure water descaling afterwards.Then at 600~730 DEG C
90~130min of lower tempering heat preservation, can be such that alloying element evenly, disperse is precipitated, and be conducive to from supersaturated solid solution
Improve the stability of tempered structure.
In a preferred embodiment, the step of smelting includes：Mixed raw material is subjected to electric furnace smelting and stove successively
Outer refining；Preferably, the step of casting includes：Mixed raw material after smelting is subjected to arc continuous casting, obtains blank；More preferably
Ground, before arc continuous casting, manufacturing method further includes the step of carrying out vacuum outgas to the mixed raw material after smelting.
In a preferred embodiment, it using whole ar blowing refining technique during external refining, and is refining
Calcium carbide, aluminum shot and carbon dust are added in system and carries out deoxidation；Preferably, the step of vacuum outgas includes：By the mixing after smelting
Raw material keeps 20min or more under vacuum.It is preferred that the vacuum environment of Vacuum Degassing Process is end vacuum environment herein.
Preferably, in the step of arc continuous casting, casting speed is 0.8~1.0m/min, and the degree of superheat is 35~44 DEG C.In arc
In shape casting process, casting speed and the degree of superheat control the segregation for being conducive to control ingredient in steel in above range, so as to improve
The microstructure segregation degree of seamless steel pipe product is conducive to improve impact flexibility.
In a preferred embodiment, during heat treatment pipe is aligned, straightening temperature is 600~700
℃。
The advantageous effect further illustrated the present invention by the following examples：
Embodiment 1 to 18, comparative example 1 and 2
Seamless steel pipe is prepared in above-described embodiment and comparative example, the preparation process of use is identical, the difference lies in
The formula of chemical element is different, specific as follows：
Preparation process is as follows：
Dispensing is carried out according to the chemical composition of crane arm support steel pipe, obtains mixed raw material.
Mixed raw material is smelted successively, vacuum outgas, casting, obtain blank.Specifically, the step of smelting is as follows：
Mixed raw material is subjected to electric furnace smelting and external refining successively, using whole ar blowing refining technique during external refining, and
Calcium carbide, aluminum shot and carbon dust are added in refinery systems and carries out deoxidation.The step of vacuum outgas, includes：Mixing after smelting is former
Material keeps 30min under the conditions of end vacuum.The step of casting use arc continuous casting, casting speed be 0.8~1.0m/min, mistake
Temperature is 35~44 DEG C.
Blank is heated in annular furnace, heating schedule is as follows：Blank is preheated successively, heat up heating and soaking,
Obtain hot base, and by the total time of blank heating >=190min.The process of preheating includes：Blank is preheated with furnace temperature；It rises
The process of temperature includes five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating successively, wherein one section of heating
Temperature is 1024 DEG C, heating time 40min；The temperature of two sections of heating is 1138 DEG C, heating time 50min；The temperature of three sections of heating
It is 1250 DEG C to spend, heating time 30min；The temperature of four sections of heating is 1267 DEG C, heating time 30min；The temperature of five sections of heating
It is 1263 DEG C, heating time 30min；During soaking, soaking temperature is 1260 DEG C, and heating time 50min obtains hot base.
To hot base into eleven punch 11, hollow billet is obtained；Hollow billet is rolled into hollow forging, then by hollow forging sizing, obtains hot-rolled pipe (specification Ф 168
×16mm)。
Hot-rolled pipe is subjected to Tempering and Quenching, specifically, at a temperature of 1100 DEG C, hot-rolled pipe is subjected to heat preservation 60min, so
The hot-rolled pipe after heat preservation is quenched successively afterwards, first time de-scaling, surface water-spraying control, the de-scaling water pressure of first time de-scaling
>=25MPa obtains the first processing steel pipe；At a temperature of 600 DEG C, first time tempering is carried out to the first processing steel pipe, is then carried out
Second of de-scaling, air cooling, de-scaling water pressure >=20MPa of second of de-scaling, obtain second processing steel pipe；In 730 DEG C of temperature
Under degree, second is carried out to second processing steel pipe and is tempered, then carries out third time de-scaling, air cooling, third time de-scaling removes
Squama water pressure >=20MPa obtains heat treatment pipe.
Heat treatment pipe is aligned, obtains crane arm support steel pipe；Wherein straightening temperature is 600~700 DEG C.
Chemical element content (the unit of seamless steel pipe in each embodiment and comparative example：Wt%) as shown in table 1 to table 3：
Table 1
Table 2
Table 3
The performance of seamless steel pipe obtained in above-described embodiment 1 to 18, comparative example 1 and 2 is characterized, characterizing method is such as
Under：
(1) mechanical property：Tensile strength (Rm), yield strength (Rp 0.2), elongation percentage, -40 DEG C of ballistic works, -60 DEG C of punchings
Hit work(, brittle transition temperature；Test method is carried out according to GB/T229-2007
(2) performance is aligned：The rope tightened or line that every meter of straightness is 1m with meter ruler or length is close to steel pipe, at this
The maximum distance of steel pipe range arm or rope or line is every meter of straightness at this in the range of 1m, is continuously measured along steel pipe 1m long whole
Root steel pipe, maximum straightness are every meter of straightness of the root steel pipe.
(3) surface property：Range estimation.
Test result is shown in Table 4 and table 5：
Table 4
Table 5
The intensity of crane arm support seamless steel pipe in comparative example it can be seen from the data in upper table 1 and 2 can lead to
It crosses reduction temperature and reaches 960MPa grade of steels, but impact flexibility is bad, be unable to reach required by 960MPa grade of steel arm support pipes
Good obdurability matching；And rational ingredient is passed through on the basis of common crane arm support seamless steel pipe according to the present invention
Proportioning can be produced more than minimum yield strength 960MPa and with excellent low-temperature impact toughness seamless steel pipe.And by
It is good that steel pipe sizes accuracy data can be seen that the 960MPa grade of steels superhigh intensity arm support pipe size precision after double tempering technique
Well, straightness is excellent, completely solves the problem of superhigh intensity arm support pipe is difficult to align.By the proportion optimizing of alloying element,
Steel-making, hot rolling technology and the heat treatment process of optimization, can it is economical, production surface quality is good in bulk, straightness is excellent
960MPa grade of steel more than crane arm support seamless steel pipes.
Embodiment 21
The embodiment is prepared for seamless steel pipe, and chemical element content, preparation process embodiment 5 are identical, and difference exists
Certain process conditions in preparation process are different, specific as follows：
Blank is heated in annular furnace, heating schedule is as follows：Blank is preheated successively, heat up heating and soaking,
Obtain hot base, and by the total time of blank heating >=190min.The process of preheating includes：Blank is preheated with furnace temperature；It rises
The process of temperature includes five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating successively, wherein one section of heating
Temperature is 1014 DEG C, heating time 40min；The temperature of two sections of heating is 1128 DEG C, heating time 50min；The temperature of three sections of heating
It is 1240 DEG C to spend, heating time 30min；The temperature of four sections of heating is 1257 DEG C, heating time 30min；The temperature of five sections of heating
It is 1253 DEG C, heating time 30min；During soaking, soaking temperature is 1250 DEG C, and heating time 50min obtains hot base.
Embodiment 22
The embodiment is prepared for seamless steel pipe, and chemical element content, preparation process embodiment 5 are identical, and difference exists
Certain process conditions in preparation process are different, specific as follows：
Blank is heated in annular furnace, heating schedule is as follows：Blank is preheated successively, heat up heating and soaking,
Obtain hot base, and by the total time of blank heating >=190min.The process of preheating includes：Blank is preheated with furnace temperature；It rises
The process of temperature includes five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating successively, wherein one section of heating
Temperature is 1034 DEG C, heating time 40min；The temperature of two sections of heating is 1148 DEG C, heating time 50min；The temperature of three sections of heating
It is 1260 DEG C to spend, heating time 30min；The temperature of four sections of heating is 1277 DEG C, heating time 30min；The temperature of five sections of heating
It is 1273 DEG C, heating time 30min；During soaking, soaking temperature is 1270 DEG C, and heating time 50min obtains hot base.
Embodiment 23
The embodiment is prepared for seamless steel pipe, and chemical element content, preparation process embodiment 5 are identical, and difference exists
Certain process conditions in preparation process are different, specific as follows：
Blank is heated in annular furnace, heating schedule is as follows：Blank is preheated successively, heat up heating and soaking,
Obtain hot base, and by the total time of blank heating >=190min.The process of preheating includes：Blank is preheated with furnace temperature；It rises
The process of temperature includes five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating successively, wherein one section of heating
Temperature is 1004 DEG C, heating time 40min；The temperature of two sections of heating is 1118 DEG C, heating time 50min；The temperature of three sections of heating
It is 1230 DEG C to spend, heating time 30min；The temperature of four sections of heating is 1247 DEG C, heating time 30min；The temperature of five sections of heating
It is 1243 DEG C, heating time 30min；During soaking, soaking temperature is 1240 DEG C, and heating time 50min obtains hot base.
Embodiment 24
Blank is heated in annular furnace, heating schedule is as follows：Blank is preheated successively, heat up heating and soaking,
Hot base is obtained, and is 180min by the total time of blank heating.The process of preheating includes：Blank is preheated with furnace temperature；It rises
The process of temperature includes five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating successively, wherein one section of heating
Temperature is 1024 DEG C, heating time 20min；The temperature of two sections of heating is 1138 DEG C, heating time 60min；The temperature of three sections of heating
It is 1250 DEG C to spend, heating time 20min；The temperature of four sections of heating is 1267 DEG C, heating time 30min；The temperature of five sections of heating
It is 1263 DEG C, heating time 20min；During soaking, soaking temperature is 1260 DEG C, and heating time 30min obtains hot base.
The performance of seamless steel pipe obtained in above-described embodiment 21 to 24 is characterized, test result is shown in Table 6 and table 7：
Table 6
Table 7
| Embodiment | Surface property | Outer-diameter accuracy | Wall thickness accuracy | Straightness |
| 21 | Surface is smooth | 167.5~168.6 | 15.3~16.7 | 1.0mm/m |
| 22 | Surface is smooth | 167.4~168.3 | 15.2~16.6 | 1.2mm/m |
| 23 | Surface is smooth | 167.3~168.4 | 15.1~16.6 | 1.5mm/m |
| 24 | Surface is smooth | 167.2~168.4 | 15.2~16.5 | 1.4mm/m |
It can be seen from the above description that the above embodiments of the present invention realize following technique effect：
Crane arm support steel pipe provided by the invention, yield strength have reached the rank of more than 960MPa.It is also, logical
Cross the suitably microalloy elements such as alloying elements and Nb, V, Al such as addition Cr, Mo, W, and pass through Cr, Mo, W, Nb, V, Al, C
Synergistic effect between N element easily makes steel tube surface generate dense oxide iron sheet and the bending of water quenching process in stringent control
Under the premise of alloying element, steel pipe is made to reach 960 grade of steels by the carbide of microalloy element and the disperse educt of nitride strong
Degree and toughness reguirements, not only make steel pipe be not likely to produce dense oxide iron sheet and bending in process of production, have good surface
Quality and straightness, and make steel pipe that also there is excellent low-temperature flexibility and weldability while having superhigh intensity.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of crane arm support steel pipe, which is characterized in that by weight percentage, the crane arm support is included with steel pipe
0.10~0.20% C element, 0.10~0.90% Si elements, 0.008~0.070% Al elements, 0.80~3.60%
Cr elements, 0.40~1.80% Mo elements, 0.03~0.16% V element, 0.03~0.35% Nb elements, 0.10~
1.50% W elements and 0~0.005% N element, and surplus is Fe elements and inevitable impurity.
2. crane arm support steel pipe according to claim 1, which is characterized in that by weight percentage, the lifting
Horn frame further includes 0.2~1.50% Ni elements with steel pipe.
3. crane arm support steel pipe according to claim 2, which is characterized in that by weight percentage, the lifting
Horn frame with steel pipe include 0.11~0.15% the C element, 0.28~0.76% Si elements, 0.023~
The 0.060% Al elements, 0.90~1.20% Cr elements, 0.50~0.60% Mo elements, 0.056~
0.12% V element, 0.039~0.12% Nb elements, 0.565~1.23% W elements, 0.34~
The 1.32% Ni elements and 0~0.005% N element, and surplus is the Fe elements and inevitable impurity；
Preferably, the weight ratio between the W elements, the Nb elements, the V element and the Al elements is 20~24:1.8
~2:2~2.2:1.
4. crane arm support steel pipe according to any one of claim 1 to 3, which is characterized in that by weight percentage
Meter, the crane arm support further includes 1.00~2.50% Mn elements with steel pipe, preferably include 1.10~1.41% it is described
Mn elements.
5. crane arm support steel pipe according to claim 4, which is characterized in that the crane arm support is also wrapped with steel pipe
P element, S elements, O elements, H element and As elements are included, and based on the weight percent of the crane arm support steel pipe, it is described
Content≤0.020% of P element, content≤0.010% of the S elements, content≤0.003% of the O elements, the H
Content≤0.0002% of element, and content≤0.025% of the As elements.
6. crane arm support steel pipe according to claim 5, which is characterized in that the crane arm support is also wrapped with steel pipe
Include Sn elements, Pb elements, Sb elements and Bi elements, and the Sn elements, the Pb elements, the Sb elements, the Bi elements
And the sum of the weight percent of the As elements in the crane arm support steel pipe≤0.05%.
7. crane arm support steel pipe according to claim 4, which is characterized in that the carbon of the crane arm support steel pipe
The weight content of the C element is denoted as a by equivalent Ceq≤0.75%, the weight content of the Mn elements is denoted as b, by described in
The weight content of Cr elements is denoted as c, and the weight content of the Mo elements is denoted as d, the weight content of the V element is denoted as e,
The weight content of the Ni elements is denoted as f, wherein Ceq=a+b/6+ (c+d+e)/5+f/15.
8. the manufacturing method of the crane arm support steel pipe described in a kind of any one of claim 1 to 7, which is characterized in that packet
Include following steps：
Dispensing is carried out according to the chemical composition of crane arm support steel pipe, obtains mixed raw material；
The mixed raw material is smelted, is cast, obtains blank；
The blank is rolled, obtains hot-rolled pipe；
The hot-rolled pipe is subjected to Tempering and Quenching, obtains heat treatment pipe；And
The heat treatment pipe is aligned, obtains the crane arm support steel pipe.
9. manufacturing method according to claim 8, which is characterized in that include the process that the blank rolls：
The blank in annular furnace is heated to 1230~1280 DEG C, obtains hot base；
To the hot base into eleven punch 11, hollow billet is obtained；
The hollow billet is rolled into hollow forging, then by the hollow forging sizing, obtains the hot-rolled pipe.
10. manufacturing method according to claim 9, which is characterized in that include the process of the blank heating：Successively will
The blank is preheated, heat up heating and soaking, obtains the hot base, and by the total time of the blank heating >=
190min；
Preferably, the process of the preheating includes：The blank is preheated with furnace temperature；The process of the heating includes successively
Five sections of one section of heating, two sections of heating, three sections of heating, four sections of heating and heating, wherein the temperature of one section of the heating for 1024 ±
10 DEG C, heating time >=30min；The temperature of two sections of the heating is 1138 ± 10 DEG C, heating time >=40min；The heating
Three sections of temperature is 1250 ± 10 DEG C, heating time >=20min；The temperature of four sections of the heating is 1267 ± 10 DEG C, during heating
Between >=20min；The temperature of five sections of the heating is 1263 ± 10 DEG C, heating time >=20min；During the soaking,
Hot temperature is 1260 ± 10 DEG C, heating time >=40min.
11. the manufacturing method according to any one of claim 8 to 10, which is characterized in that adjust the hot-rolled pipe
The step of matter is heat-treated includes：
At a temperature of 900~1100 DEG C, the hot-rolled pipe is kept the temperature, then the hot-rolled pipe after heat preservation is carried out successively
Quenching, first time de-scaling, surface water-spraying control, obtain the first processing steel pipe；Preferably, the de-scaling hydraulic pressure of the first time de-scaling
Power >=25MPa；
At a temperature of 500~600 DEG C, first time tempering is carried out to the described first processing steel pipe, then carries out second of de-scaling, sky
Air cooling obtains second processing steel pipe；Preferably, de-scaling water pressure >=20MPa of second of de-scaling；And
At a temperature of 600~730 DEG C, second is carried out to the second processing steel pipe and is tempered, then carries out third time de-scaling, sky
Air cooling obtains the heat treatment pipe；Preferably, de-scaling water pressure >=20MPa of the third time de-scaling.
12. the manufacturing method according to any one of claim 8 to 10, which is characterized in that the step of smelting includes：
The mixed raw material is subjected to electric furnace smelting and external refining successively；Preferably, the step of casting includes：After smelting
The mixed raw material carries out arc continuous casting, obtains the blank；It is highly preferred that before the arc continuous casting, the manufacturing method
Further include the step of vacuum outgas is carried out to the mixed raw material after smelting.
13. manufacturing method according to claim 12, which is characterized in that blown during the external refining using whole process
Argon refinery practice, and add in calcium carbide, aluminum shot and carbon dust in refinery systems and carry out deoxidation；Preferably, the vacuum outgas
Step includes：The mixed raw material after smelting is kept into 20min or more under vacuum；Preferably, the arc connects
In the step of casting, casting speed is 0.8~1.0m/min, and the degree of superheat is 35~44 DEG C.
14. the manufacturing method according to any one of claim 8 to 10, which is characterized in that carry out the heat treatment pipe
During aligning, straightening temperature is 600~700 DEG C.
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|---|---|
| CN108251747B (en) | 2020-01-10 |
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