CN108456823A - Steel pipe, its raw material, preparation method and hydraulic cylinder - Google Patents
Steel pipe, its raw material, preparation method and hydraulic cylinder Download PDFInfo
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- CN108456823A CN108456823A CN201810231195.9A CN201810231195A CN108456823A CN 108456823 A CN108456823 A CN 108456823A CN 201810231195 A CN201810231195 A CN 201810231195A CN 108456823 A CN108456823 A CN 108456823A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
The present invention provides a kind of steel pipe, its raw material, preparation method and hydraulic cylinders.By weight percentage, the raw material include 0.1~0.18% C, 0.2~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7% Mo, 1~1.6% Ni, 0.03~0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below, 0.06% Nb below, 0.05% Ti below, 0.05% Al below, remaining is Fe and inevitable impurity.The steel pipe being prepared by above-mentioned raw materials can not only have higher intensity and toughness, additionally it is possible to have excellent weldability, can be used in the cylinder tube steel pipe for producing higher intensity index.
Description
Technical field
The present invention relates to steel pipe processing technique field, in particular to a kind of steel pipe, its raw material, preparation method with
And hydraulic cylinder.
Background technology
Hydraulic cylinder is the important component of hydraulic cylinder, is that hydraulic energy is changed into mechanical energy, does linear reciprocation fortune
The hydraulic actuator of dynamic (or pendulum motion).When realizing reciprocating motion, deceleration device can be removed from, and be not driven with it
Gap, stable movement, therefore be used widely in various machinery hydraulic systems, hydraulic support is used in process of coal mining
Height in control coal working face mine top, and mine top is supported, a moveable down-hole coal excavation space is formed, so that scraper plate is defeated
Send the operation under this space of machine and coalcutter.
Hydraulic cylinder includes cylinder barrel, cylinder cap, piston, piston rod, sealing device and buffer unit, hydraulic cylinder power output and piston
Effective area and its pressure difference on both sides are directly proportional, and cylinder barrel is the key element to form inner cavity and contain fluid, therefore hydraulic cylinder
It is resistance to bear the comprehensive performances such as pressure, wearability, fatigue strength play the role of to the service life of hydraulic cylinder it is key.Typically for
Hydraulic cylinder requirement, highest are resistant to the pressure of 20MPa (continuous) or more, and highest is even up to 55MPa.
According to basic hydraulic pressure relationship (Pascal's law), the size of the line pressure generated by cylinder body is system fluid pressure
The product of the effective area A of power P and piston, i.e. F=PA, frictional force and other active loss can reduce the effect of power.Cylinder barrel is
Inner cavity contains the key element that fluid forms Fluid pressure P, so cylinder barrel is to ensuring that it is key that line pressure F plays the role of.It is existing
Some cylinder body of hydraulic oil cylinder mostly use materials, intensity and the toughness such as 27SiMn, 20MnTiB limited.With hydraulic test
Enlargement, the use intensity of oil cylinder further increases, and the requirement to material is also higher and higher.Therefore, there is an urgent need for exploitations one at present
The cylinder tube pipe of kind higher intensity index.
Invention content
The main purpose of the present invention is to provide a kind of steel pipe, its raw material, preparation method and hydraulic cylinders, to solve
It is used to prepare its intensity of the material of cylinder tube pipe and the limited problem of toughness in the prior art.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of raw material of steel pipe, by weight percentage
Than meter, raw material includes 0.1~0.18% C, 0.2~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2
~0.7% Mo, 1~1.6% Ni, 0.03~0.12% V, 0.02% P below, 0.01% S below, 0.3% with
Under Cu, 0.06% Nb below, 0.05% Ti below, 0.05% Al below, remaining is Fe and inevitably miscellaneous
Matter.
Further, in the raw material of steel pipe, C equivalents CEV is below 0.7%.
Further, by weight percentage, C：0.13~0.18%, Si：0.2~0.37%, Mn：1.1~1.3%,
Cr：0.7~0.85%, Mo：0.5~0.55%, Ni：1.4~1.6%, V：0.04~0.07%, Cu：0.15 or less, Nb：
0.02 hereinafter, Al：0.015~0.05%.
According to another aspect of the present invention, a kind of preparation method of steel pipe is provided, is included the following steps：S1, to right
It is required that the raw material of any one of 1 to 3 steel pipe is smelted, blank is obtained；S2, it by blank heating and perforates, obtains hollow billet；
S3, it by hollow billet tube rolling and is heat-treated, obtains production tube.
Further, step S3 includes：By the rolling hollow forging of hollow billet；By hollow forging heating and sizing, pre- pipe is obtained；It is right
Pre- pipe carries out quenching treatment, obtains production tube, and the preferably hardening heat of quenching treatment is 940~960 DEG C, soaking time 30
~60min, preferably quenching treatment are water quenching.
Further, after step s 3, preparation method further includes the steps that production tube is cooling and carries out temper,
It is preferred that the temperature of temper is 600~700 DEG C, soaking time is 40~90min.
According to another aspect of the present invention, additionally provide a kind of steel pipe, in percentage by weight, steel pipe include 0.1~
0.18% C, 0.2~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7% Mo, 1~
1.6% Ni, 0.03~0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below, 0.06% with
Under Nb, 0.05% Ti below, 0.05% Al below, remaining is Fe and inevitable impurity.
Further, in steel pipe, C equivalents CEV is below 0.7%.
Further, the outer diameter of steel pipe is 400mm or more, and the wall thickness of steel pipe is 40mm or more.
In accordance with a further aspect of the present invention, a kind of hydraulic cylinder, including cylinder barrel pipe, the steel that cylinder barrel is with pipe are additionally provided
The steel pipe that pipe or above-mentioned preparation method obtain.
It applies the technical scheme of the present invention, provides a kind of raw material of steel pipe, by weight percentage, which includes
0.1~0.18% C, 0.2~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7% Mo, 1
~1.6% Ni, 0.03~0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below, 0.06%
Nb below, 0.05% Ti below, 0.05% Al below, remaining is Fe and inevitable impurity, suitable by controlling
The C of amount, to ensure welding performance；By adding suitable Mn, Ni and V, the intensity of steel alloy is improved；By add in right amount Mo and
Cr improves the quenching degree of steel alloy, makes steel alloy high intensity by improving quenching degree while playing solution strengthening effect；It is logical
Appropriate addition Ni is crossed, the toughness of steel alloy is improved, it is higher to make the steel pipe being prepared by above-mentioned raw materials that can not only have
Intensity and toughness, additionally it is possible to have excellent weldability, can be used in produce higher intensity index cylinder tube steel
Pipe.
Description of the drawings
The Figure of description for constituting the part of the present invention is used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows the flow diagram of the preparation method of the steel pipe of the application.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein.In addition, term " comprising " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing series of steps or unit
Process, method, system, product or equipment those of are not necessarily limited to clearly to list step or unit, but may include without clear
It is listing to Chu or for these processes, method, product or equipment intrinsic other steps or unit.
As background technology is introduced, it is used to prepare its intensity of the material of cylinder tube pipe and toughness in the prior art
It is limited.In order to solve technical problem as above, present applicant proposes a kind of raw materials of steel pipe, by weight percentage, raw material
Including 0.1~0.18% C, 0.2~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7%
Mo, 1~1.6% Ni, 0.03~0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below,
0.06% Nb below, 0.05% Ti below, 0.05% Al below, remaining is Fe and inevitable impurity.
By controlling suitable C in the raw material of the above-mentioned steel pipe of the present invention, to ensure welding performance；It is appropriate by adding
Mn, Ni and V, improve the intensity of steel alloy；By adding Mo and Cr in right amount, steel alloy is improved while playing solution strengthening effect
Quenching degree, make steel alloy high intensity by improving quenching degree；By adding Ni in right amount, the toughness of steel alloy is improved, from
And make the steel pipe being prepared by above-mentioned raw materials that can not only there is higher intensity and toughness, additionally it is possible to have excellent solderable
Connecing property can be suitable for the cylinder tube steel pipe of higher intensity index.
The present invention above-mentioned steel pipe raw material in, it is preferable that in the raw material of steel pipe the weight percent of C be 0.13~
0.18%, it is limited to the intensity that above-mentioned preferred parameter area is conducive to improve steel pipe.
In a preferred embodiment, the C equivalents in the raw material of steel pipe are controlled below 0.7%.It can protect in this way
Card steel pipe has preferable intensity, while can guarantee that the calculation formula of above-mentioned C equivalents is CEV=C with preferable welding performance again
+(Mn/6)+[(Cr+Mo+V)/5〕+[(Ni+Cu)/15]。
In the raw material of the above-mentioned steel pipe of the present invention, Si elements can remove the oxygen element in raw material, improve the toughness of steel pipe.
In a preferred embodiment, the weight percent of Si is 0.2~0.37% in the raw material of steel pipe, is limited to above-mentioned
Preferred parameter area is conducive to improve the toughness of steel pipe.
In the raw material of the above-mentioned steel pipe of the present invention, Mn elements can not only improve the intensity of steel pipe, additionally it is possible to improve steel
The quenching degree and reduction hardening heat of pipe.In a preferred embodiment, the weight percent of Mn is in the raw material of steel pipe
1.1~1.3%.It is limited to the intensity for being conducive to further increase steel pipe in above-mentioned preferred parameter area.
In the raw material of the above-mentioned steel pipe of the present invention, V is to generate carbide, nitride, improve steel by precipitation strength
Intensity element.However, if the content of V is excessive, carbide and nitride coarsening can be led to, to influence steel pipe
Toughness, therefore, in a preferred embodiment, the weight percent of V is 0.04~0.07% in the raw material of steel pipe.
In a preferred embodiment, the weight percent of Cr is 0.7~0.85% in the raw material of steel pipe.Above-mentioned
In the raw material of steel pipe, Cr elements can form carbide with C element, and the dosage of Cr elements is limited to above-mentioned preferred parameter model
Be conducive to further increase the intensity and quenching degree of steel pipe, degree of grain refinement and temper resistance in enclosing.
In a preferred embodiment, the weight percent of Mo is 0.5~0.55% in the raw material of steel pipe.Above-mentioned
In the raw material of steel pipe, Mo elements can form carbide with C element, and the dosage of Mo elements is limited to above-mentioned preferred parameter model
Be conducive to further improve the intensity and quenching degree of steel pipe, degree of grain refinement and temper resistance in enclosing.
In a preferred embodiment, the weight percent of Ni is 1.4~1.6% in the raw material of steel pipe.Above-mentioned
In the raw material of steel pipe, Ni is not only to make the element of steel high intensity by improving the quenching degree of steel, still helps to improve toughness
Element, the dosage of Ni elements is limited to be conducive in above-mentioned preferred parameter area further improve steel pipe intensity and
Toughness.
The raw material of the above-mentioned steel pipe of the present invention includes optional P and S, and above-mentioned P and S are impurity, by the content for reducing P
The toughness that steel pipe can be improved, the content by reducing S can be reduced through hot rolling by the MnS of extension, to can also make
The toughness of steel pipe improves.In a preferred embodiment, the weight percent of P is 0.02% hereinafter, S in the raw material of steel pipe
Weight percent be 0.01% or less.
The raw material of the above-mentioned steel pipe of the present invention includes optional Nb, and Nb elements can form carbide with C element, improve steel
Thermal stability, while blank can also be made to be unlikely to grow excessively coarse in heating period austenite grain, and subsequent
The operation of rolling in so that crystal grain is further refined, improve the intensity and toughness of steel.In drawing process, with highly dispersed [Nb]
C is precipitated, and plays the effect of precipitation strength, ensures while the mechanical property of material reaches 140ksi or more intensity with excellent
Low-temperature impact toughness.In a preferred embodiment, the weight percent of Nb is 0.06% hereinafter, more in the raw material of steel pipe
Preferably 0.02 or less.Be conducive to the dosage restriction of Nb elements to make mechanical strength excellent in seamless steel pipe within the above range
It further gets a promotion with low-temperature impact toughness.
The raw material of the above-mentioned steel pipe of the present invention includes optional Al, and Al elements can not only make deoxidier and coordinate with Si elements
Haul out the oxygen in raw material, additionally it is possible to which crystal grain is grown up when effectively steel being inhibited to heat in smelting process, to play crystal grain thinning
Effect.In a preferred embodiment, the weight percent of Al is 0.05%, more preferably 0.015 in the raw material of steel pipe
~0.05%, the time limit is scheduled on above-mentioned preferred parameter area and is conducive to make the crystal grain of steel pipe raw material more to refine, thus into one
Step improves its toughness.
The raw material of the above-mentioned steel pipe of the present invention includes optional Ti, and Ti can form fine nitride (TiN), to press down
The coarsening of austenite grain when heating of plate blank processed and the element for contributing to the miniaturization of tissue.However, if the content of Ti
Excessively, then coarsening and the caused precipitation-hardenings of TiC for generating TiN, to influence the toughness of steel pipe, therefore, a kind of excellent
In the embodiment of choosing, the weight percent of Ti is 0.05% or less in the raw material of steel pipe.
The raw material of the above-mentioned steel pipe of the present invention includes optional Cu, and Cu is to make Cu high intensity by improving the quenching degree of steel pipe
The element of change；In addition, Cu also contributes to the element of solution strengthening.In a preferred embodiment, in the raw material of steel pipe
The weight percent of Cu is 0.3% or less；If the content of Cu is excessive, the surface texture of steel pipe is damaged sometimes, it is therefore, more excellent
It is selected as 0.15 or less.
According to another aspect of the present invention, a kind of preparation method of steel pipe is provided, as shown in Figure 1, including the following steps：
S1, the raw material of above-mentioned steel pipe is smelted, obtains blank；S2, it by blank heating and perforates, obtains hollow billet；S3, by the hollow billet
Tube rolling is simultaneously heat-treated, and obtains production tube.
The steel pipe can have higher intensity and toughness, additionally it is possible to have excellent due to being made of above-mentioned raw material
Weldability, can be used in produce higher intensity index cylinder tube steel pipe.
In above-mentioned steps S1, specifically, the raw material of steel pipe is prepared according to aforementioned proportion；The raw material is refined and cast
It makes and blank is made.It is mingled with smelting using low, wherein：As≤0.025%, Sn≤0.020%, As+Sn+Sb+Pb+Bi≤
0.050%；[H]≤1.5ppm、[O]≤25ppm.
In above-mentioned steps S2, specifically, by above-mentioned blank heating, hot base is obtained；Cone-type piercer is carried out to above-mentioned hot base,
Obtain hollow billet.Heating process to above-mentioned blank includes three phases, specially warm-up phase, heating period and soaking rank
Section, those skilled in the art can carry out reasonable set according to the prior art to the heating temperature in above-mentioned each stage, by upper
The heat stepwise stated, makes pipe be stepped up to soaking temperature, avoids that heating rate is too fast to be caused to crack in hot base
Defect.
Above-mentioned steps S3 may include：By the rolling hollow forging of hollow billet；By hollow forging heating and sizing, pre- pipe is obtained；
The pre- pipe is subjected to quenching treatment, obtains production tube.
In a preferred embodiment, hollow billet is rolled using Pilger rolling unit (pilgrim rolling unit)
System.The operation of rolling carried out using pilgrim rolling machine, the deformation of period tube rolling are to be based on forging, rolling, squeeze Trinitarian deformation
Mode is either forged during period tube rolling, or rolling and crimp, metal in deformed area always all in
Three-dimensional compressive stress state is conducive to that deformed area metal is inhibited to crack, and the rolling that steel pipe can be effectively ensured compares and internal group
The dense uniform knitted.
In a preferred embodiment, quenching treatment is carried out to above-mentioned pre- pipe at a temperature of 940~960 DEG C,
And 30~60min is kept the temperature, the uniformity of steel pipe austenitizing is further ensured in this way, while alloy being made at the uniform velocity to be substantially dissolved in
In austenite, more preferable quenching treatment is water quenching.
After above-mentioned steps S3, above-mentioned preparation method can also include carrying out temper and the step of cooling to production tube
Suddenly.In a preferred embodiment, after the above-mentioned production tube after above-mentioned sizing being cooled down at a temperature of 600~700 DEG C
Be tempered, and keep the temperature 40~90min after it is air-cooled obtain above-mentioned steel pipe, further make alloying element from oversaturated solid solution in this way
It is fully precipitated in body, obtains the carbide of disperse and the tissue after tempering is made to tend to stablize.In the processing procedure, alloying element
Effect fully played, and then improve steel duct metallographic structure stability, improve the plasticity and toughness of steel pipe.
After above-mentioned temper and the step of cooling, above-mentioned preparation method can also include straightening step, preferably rectify
The temperature of straight step is 450~630 DEG C.Straightening temperature after tempering is advantageously reduced in straightening process and is produced within the above range
Raw residual stress.
According to another aspect of the present invention, additionally provide a kind of steel pipe, in percentage by weight, steel pipe include 0.1~
0.18% C, 0.2~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7% Mo, 1~
1.6% Ni, 0.03~0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below, 0.06% with
Under Nb, 0.05% Ti below, 0.05% Al below, remaining is Fe and inevitable impurity.
Due to containing suitable C in the above-mentioned steel pipe of the present invention, to ensure welding performance；Suitable Mn, Ni and V can
Improve the intensity of steel alloy；Suitable Mo and Cr improves the quenching degree of steel alloy while playing solution strengthening effect, pass through raising
Quenching degree and make steel alloy high intensity；Suitable Ni can improve the toughness of steel alloy, higher strong to make steel pipe have
Degree and toughness, additionally it is possible to there is excellent weldability, can be used in the cylinder tube steel pipe for producing higher intensity index.
In the above-mentioned steel pipe of the present invention, it is preferable that the C equivalents in control steel pipe are below 0.7%.It can ensure in this way
Steel pipe has preferable intensity, while can guarantee that the calculation formula of above-mentioned C equivalents is CEV=C+ with preferable welding performance again
(Mn/6)+[(Cr+Mo+V)/5〕+[(Ni+Cu)/15]。
The above-mentioned steel pipe of the present invention can be applied in hydraulic cylinder manage as cylinder barrel, and the outer diameter of steel pipe is at this time
400mm or more, the wall thickness of steel pipe are 40mm or more, compared with the prior art in the cylinder barrel with equivalent specifications manage, it is of the invention
Above-mentioned steel pipe have higher intensity, toughness and excellent weldability, regular size such as 1 institute of table of above-mentioned cylinder barrel pipe
Show.
Table 1
| Specification | Purposes | Outer diameter/mm | Outer diameter tolerance | Wall thickness/mm | Wall thickness tolerance |
| 710*63 | 600 outer cylinders | 710 | ±4 | 63 | (+5, -2) |
| 572*69 | Cylinder barrel in 600 | 572 | ±3 | 69 | (+5, -2) |
| 615*50 | 530 outer cylinders | 615 | (+4, -3) | 50 | (+4, -2) |
| 502*68 | Cylinder barrel in 530 | 502 | ±2 | 68 | (+5, -2) |
| 585*50 | 500 outer cylinders | 585 | ±3 | 50 | (+3, -2) |
| 480*57 | Cylinder barrel in 500 | 480 | ±2 | 57 | (+3, -2) |
| 524*44 | 450 outer cylinders | 524 | ±2 | 44 | ±2 |
| 441*54 | Cylinder barrel in 450 | 441 | ±2 | 54 | (+3, -2) |
In accordance with a further aspect of the present invention, a kind of hydraulic cylinder, including cylinder barrel pipe are additionally provided, cylinder barrel pipe is upper
The steel pipe that the steel pipe or above-mentioned preparation method stated obtain.
The above-mentioned hydraulic cylinder of the present invention is since including above-mentioned steel pipe, above-mentioned steel pipe can not only have higher intensity
And toughness, additionally it is possible to there is excellent weldability, can be used in the cylinder tube steel pipe for producing higher intensity index.
Below in conjunction with specific embodiment, present invention is further described in detail, these embodiments should not be understood as limitation originally
Invent range claimed.
In the application the element composition of steel pipe made from embodiment 1 to 17 and the element of steel pipe in comparative example 1 to 9 at
Point, it is shown in Table 2.
Embodiment 1 to 17 and comparative example 1 to 9 are made by the following method：
The raw material is carried out refining and blank, each embodiment is made in casting by the raw material that steel pipe 1, is prepared according to aforementioned proportion
Middle chemical constituent composition is shown in Table 2；
2, by above-mentioned blank heating, hot base is obtained；Cone-type piercer is carried out to above-mentioned hot base, obtains hollow billet.
3, by the rolling hollow forging of hollow billet；By hollow forging heating and sizing, pre- pipe is obtained；Then to above-mentioned pre- pipe into
Row quenching treatment, obtains production tube.
4, it will be tempered after the production tube cooling after above-mentioned sizing, and air-cooled after heat preservation.
Include specifically：Blank is heated in annular furnace, 1240 DEG C is heated to and obtains hot base, hot base is expanded by taper
Diameter is perforated and pilgrim rolling unit tube rolling obtains the rolled seamless steel pipe that specification is 585 × 50mm of Ф.By the nothing of rolled
Seam steel pipe is heated to 910 DEG C, and keeps the temperature 54min, then comes out of the stove using interior appearance water injection system at a temperature of 930 DEG C water quenching simultaneously
25min is kept the temperature, then sizing obtains production tube；Then air-cooled after fighting keep the temperature 35min next time at 650 DEG C.At 500 DEG C after tempering
Under thermal straightening is carried out to steel pipe, and be air-cooled to room temperature, obtain the seamless steel pipe of embodiment.
Embodiment 14
Difference lies in quench above-mentioned hollow forging at a temperature of 960 DEG C, and keep the temperature 30min with embodiment 1.
Embodiment 15
Difference lies in quench above-mentioned hollow forging at a temperature of 940 DEG C, and keep the temperature 60min with embodiment 1.
Embodiment 16
Difference lies in will carry out after the above-mentioned production tube cooling after above-mentioned sizing at a temperature of 700 DEG C with embodiment 1
Tempering, and keep the temperature air-cooled after 40min.
Embodiment 17
Difference lies in will carry out after the above-mentioned production tube cooling after above-mentioned sizing at a temperature of 660 DEG C with embodiment 1
Tempering, and keep the temperature air-cooled after 90min.
Table 2
Such as to the method for the performance test of steel pipe in steel pipe made from the embodiment of the present application 1 to 17 and comparative example 1 to 9
Under：
Yield strength：Refer to ASTM A370-15.
Tensile strength：Refer to ASTM A370-15.
Elongation percentage：Refer to ASTM A370-15.
Impact flexibility (A kV/J)：Refer to ASTM A370-15.
Non-metallic inclusion grade：Refer to GB/T10561-2005.
The performance test results of steel pipe are shown in Table 3 in steel pipe made from the embodiment of the present application 1 to 17 and comparative example 1 to 9.
Table 3
The non-metallic inclusion grade and grain size number test result of steel pipe made from the embodiment of the present application 1 to 17 are shown in Table
4。
Table 4
Finally, the continuous casting billet low power and surface quality of steel pipe made from above-described embodiment 1 to 17 are tested, from test
As a result it can be seen that the non-metallic inclusion that coarse micro-grain sample is visible by naked eyes, center porosity, shrinkage cavity are not more than 2.0 grades respectively, in
Heart shake line, middle crack, subcrack, rimhole are not more than 1.0 grades respectively.Surface quality meets YB/T4149 requirements.
It can be seen from the above description that the above embodiments of the present invention realize following technique effect：
1, by adding suitable C, to ensure welding performance；By adding suitable Mn, Ni and V, steel alloy is improved
Intensity；By adding Mo and Cr in right amount, the quenching degree of steel alloy is improved while playing solution strengthening effect, by improving quenching degree
And make steel alloy high intensity；By adding Ni in right amount, the toughness of steel alloy is improved, to make to be prepared by above-mentioned raw materials
Steel pipe can not only have higher intensity and toughness, additionally it is possible to have excellent quenching degree and weldability, can be used in giving birth to
Produce the cylinder tube thick walled steel tube of higher intensity and toughness index；
2, the C equivalents in the raw material of control steel pipe are below 0.7%.It can ensure that steel pipe has preferable intensity in this way, together
When can guarantee again with preferable welding performance；
3, above-mentioned steel pipe of the invention can be applied in hydraulic cylinder manage as cylinder barrel, and the outer diameter of steel pipe is at this time
400mm or more, the wall thickness of the steel pipe are 40mm or more, compared with the prior art in the steel pipe with above-mentioned outer diameter and wall thickness,
The above-mentioned steel pipe of the present invention has higher intensity, toughness and excellent weldability.
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, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of raw material of steel pipe, which is characterized in that by weight percentage, the raw material include 0.1~0.18% C, 0.2
~0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7% Mo, 1~1.6% Ni, 0.03~
0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below, 0.06% Nb below, 0.05% or less
Ti, 0.05% Al below, remaining be Fe and inevitable impurity.
2. raw material according to claim 1, which is characterized in that in the raw material of the steel pipe, C equivalents CEV 0.7% with
Under.
3. raw material according to claim 1 or 2, which is characterized in that by weight percentage, C：0.13~0.18%, Si：
0.2~0.37%, Mn：1.1~1.3%, Cr：0.7~0.85%, Mo：0.5~0.55%, Ni：1.4~1.6%, V：0.04
~0.07%, Cu：0.15 or less, Nb：0.02 hereinafter, Al：0.015~0.05%.
4. a kind of preparation method of steel pipe, which is characterized in that include the following steps：
S1, the raw material of the steel pipe described in any one of claims 1 to 3 is smelted, obtains blank；
S2, it by the blank heating and perforates, obtains hollow billet；
S3, it by the hollow billet tube rolling and is heat-treated, obtains production tube.
5. preparation method according to claim 4, which is characterized in that the step S3 includes：
By the rolling hollow forging of the hollow billet；
By hollow forging heating and sizing, pre- pipe is obtained；
Quenching treatment is carried out to the pre- pipe, obtains the production tube, the hardening heat of the preferably described quenching treatment is 940~
960 DEG C, soaking time is 30~60min, and the preferably described quenching treatment is water quenching.
6. preparation method according to claim 4, which is characterized in that after the step S3, the preparation method is also
Include the steps that the production tube is cooling and carry out temper, the temperature of the preferably described temper is 600~700
DEG C, soaking time is 40~90min.
7. a kind of steel pipe, which is characterized in that in percentage by weight, the steel pipe include 0.1~0.18% C, 0.2~
0.5% Si, 0.7~1.5% Mn, 0.4~0.9% Cr, 0.2~0.7% Mo, 1~1.6% Ni, 0.03~
0.12% V, 0.02% P below, 0.01% S below, 0.3% Cu below, 0.06% Nb below, 0.05% or less
Ti, 0.05% Al below, remaining be Fe and inevitable impurity.
8. steel pipe according to claim 7, which is characterized in that in the steel pipe, C equivalents CEV is below 0.7%.
9. steel pipe according to claim 7 or 8, which is characterized in that the outer diameter of the steel pipe is 400mm or more, the steel
The wall thickness of pipe is 40mm or more.
10. a kind of hydraulic cylinder, including cylinder barrel pipe, which is characterized in that the cylinder barrel with pipe be in claim 7 to 9 it is any
The steel pipe that preparation method described in any one of steel pipe or claim 4 to 6 described in obtains.
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| CN201810231195.9A CN108456823A (en) | 2018-03-20 | 2018-03-20 | Steel pipe, its raw material, preparation method and hydraulic cylinder |
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| CN201810231195.9A CN108456823A (en) | 2018-03-20 | 2018-03-20 | Steel pipe, its raw material, preparation method and hydraulic cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619004A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth microalloying cold-drawn high-strength seamless steel tube for hydraulic cylinder and preparation method thereof |
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| CN103320711A (en) * | 2013-06-26 | 2013-09-25 | 衡阳华菱钢管有限公司 | Seamless steel tube and manufacturing method thereof |
| CN104775079A (en) * | 2015-03-24 | 2015-07-15 | 天津市精成伟业机器制造有限公司 | Marine highly weldable, large caliber, thick wall and high steel grade seamless steel pipe and preparation technology thereof |
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| CN102703836A (en) * | 2012-05-21 | 2012-10-03 | 鞍钢股份有限公司 | Manufacturing method for low temperature-used seamless steel tubes |
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| CN114619004A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth microalloying cold-drawn high-strength seamless steel tube for hydraulic cylinder and preparation method thereof |
| CN114619004B (en) * | 2022-02-28 | 2024-06-11 | 包头钢铁（集团）有限责任公司 | Rare earth microalloyed seamless steel tube for cold drawn high-strength hydraulic cylinder barrel and preparation method thereof |
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Application publication date: 20180828 |