CN107747035A - Hydraulic oil tube steel, high-pressure oil pipe and preparation method thereof - Google Patents
Hydraulic oil tube steel, high-pressure oil pipe and preparation method thereof Download PDFInfo
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- CN107747035A CN107747035A CN201710998442.3A CN201710998442A CN107747035A CN 107747035 A CN107747035 A CN 107747035A CN 201710998442 A CN201710998442 A CN 201710998442A CN 107747035 A CN107747035 A CN 107747035A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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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
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
-
- 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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- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention discloses a kind of hydraulic oil tube steel, high-pressure oil pipe and preparation method thereof, its chemical elements in percentage by mass is：C：0.11 0.17%；Si：0.1 0.5%；Mn：1.2 1.7%；Al：0.01 0.05%；Nb：0.01 0.06%；V：0.02 0.09%；Mo：0.05 0.2%；B：0.0005‑0.003；Ti≤0.03%；Cr≤0.2%；Ni≤0.2%；Cu≤0.3%；Ca：0.001 0.01%；And chemical composition meets the ＜ of relational expression 4 (B × Mo)/(C × Mn) × 104＜ 12, surplus are Fe and other inevitable impurity.Oil pipe of the present invention can reach the high-grade performance of more than 670MPa ranks, its is cost-effective with carbide+tempered sorbite that structure of steel is ferrite+Dispersed precipitate.
Description
Technical field
The present invention relates to a kind of high strength steel material, steel pipe and preparation method thereof, more particularly to a kind of oily tube steel, steel
Pipe and preparation method thereof, high-pressure oil pipe equipment and struction machine structures steel pipe equipment skill applied to high-pressure common-rail fuel system
Art field.
Background technology
There is the demand for the medium and heavy engine for surpassing million in China every year, with world energy sources crisis and environmental pollution plus
Weight, in order to save the energy, reduce discharge, new work engine must use high pressure co-rail system.Common-rail technology has significant combustion
Oily economy and low emission characteristic.In common rail fuel combustion system, high pressure fuel is transported to common feeder line by high-pressure oil pump, led to
Cross and accurate control is realized to the oil pressure in common feeder line, make high pressure pipe pressure size unrelated with the rotating speed of engine, can be with
Significantly reduce Fuel Injection Mechanism of Diesel Engine pressure with the change of engine speed, engine is obtained in all ranges of speeds non-
Often high fuel pressure, the pressure ratio conventional diesel engine of this injection system will be higher by 3 times, can reach 200MPa, and
For conventional diesel engine injection pressure in 60-70Mpa, pressure is big, is atomized, and burning is abundant, so as to improve dynamic property, is finally reached
Fuel-efficient purpose.
At present, the ISO8535-2016 that European Countries are generally quoted《The effective steel pipe of diesel engine-high pressure fuel injection
A part：The requirement of seamless cold single wall steel pipe》The high-pressure oil pipe material, its 1-4 intensity etc. of 6 strength grades is defined in standard
The yield strength of level is respectively 205,220,355,430MPa, the corresponding domestic trade mark 16Mn, 16MnV etc., referring to table 6, it is made
High-pressure oil pipe be applicable to below 160MPa operating pressure.But the yield strength of 5-6 strength grades is respectively 670,
770MPa, corresponds respectively to 180MPa, 200MPa oil spout operating pressure, and this high-grade high-pressure oil pipe is external at present related raw
Production technology holds in close confidence, can not obtain relevant information, and the country there is no producer to have ripe production decision.
Patent CN201410210420.2 discloses a kind of high-pressure oil pipe hot rolled circular steel and its manufacture method, its chemistry into
Point mass percent (wt%) is：C:0.10-0.17%, Si:0.25-0.45%, Mn:1.30-1.60%, P≤0.020%, S
≤ 0.010%, Cr:0.20-0.40%, V:0.05-0.10%, Al:0.025-0.050%, Cu:≤ 0.20%, Ni≤
0.20%, remaining is iron and remaining trace impurity, referring to table 6.The sharp document does not disclose the manufacture method of seamless steel pipe.
Patent CN200810242971.1 discloses a kind of production work for the high-pressure oil pipe that technique is simple, production cost is low
Skill, comprise the following steps：The required blank used is subjected to pickling, phosphatization and lubrication, cold group is then carried out, cold group is obtained
Materials in the tube carry out intermediate heat-treatment, the temperature control of intermediate heat-treatment at 760 ± 20 DEG C, until cold group after materials in the tube meet needed for
Specification requirement；Finally materials in the tube are carried out with 920 ± 10 DEG C of normalized treatment again and obtains required finished product.Using of the present invention
Production method.Because normalizing effectively eliminates work-hardening effect caused by cold-drawn process, the yield strength of gained oil pipe is general
Both less than 400MPa, it is impossible to be applicable the requirement to high intensity of 200MPa level common rail high-pressure oil pipes.
Patent CN201510275354.1 discloses a kind of high-strength high-voltage oil tube steel, high-pressure oil pipe and its manufacturer
Method, referring to table 6, it is necessary to which materials in the tube are carried out with the cold working lengthening coefficient of the cold deformation, wherein last passage of multi-pass
Up to 1.6-2.1, steel pipe easily ftractures in deformation process, the serious lumber recovery for reducing product；Furthermore, it desired to last a time heating
Water smoke cooling is to obtain bainite structure afterwards, and cooling velocity is 5-30 DEG C/s, and the requirement to equipment precision is very high, and cooling rate is difficult to control
System, general manufacturer do not possess working condition.
Patent 201610054373.6 discloses a kind of diesel engine high-pressure oil spout tube steel, high pressure spray oil pipe and its manufacturer
Method, available for manufacture more than 160MPa high pressure spray oil pipe, its chemical composition requires excessively strict, and steelmaking process is difficult to control,
Production process does not possess operability, and embodiment can not meet requirements of the ISO 8535 on 5-6 strength grades, referring to
Table 6.
Patent 201610493295.X discloses the manufacturer of a kind of phase transformation strengthening cold working high strength steel, steel pipe and steel pipe
Method, referring to table 6, its yield strength is applicable the high tensile steel tube for producing diameter 20-457 up to 890MPa.But due to being organized as back
Fiery martensite, the high-pressure oil pipe of small-bore is not suitable for producing.
The content of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
Hydraulic oil tube steel, high-pressure oil pipe and preparation method thereof, a kind of more than yield strength 670MPa high grade high-strength can be manufactured
Steel, applied to the effective high-pressure oil pipe of high pressure fuel injection and struction machine structures pipe field, to meet ISO8535-2016
The requirement of 5-6 strength grades is defined in standard, and the manufacturability of the seamless steel pipe is good, it is cost-effective.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
A kind of hydraulic oil tube steel, the chemical elements in percentage by mass of its material component are：
C：0.11-0.17%；Si：0.1-0.5%；Mn：1.2-1.7%；Al：0.01-0.05%；Nb：0.01-
0.06%；V：0.02-0.09%；Mo：0.05-0.2%；B：0.0005-0.003；Ti：≤ 0.03%；Cr：≤ 0.2%；Ni：
≤ 0.2%；Cu：≤ 0.3%；Ca：0.001-0.01%；Surplus is Fe and other inevitable impurity；And chemical composition
Meet the ＜ of relational expression 4 (B × Mo)/(C × Mn) × 104＜ 12, relational expression each element symbology corresponding element composition is as material
Expect the quality of component.The inevitable impurity of hydraulic oil tube steel of the present invention is mainly S, P, O, N element.
The design principle of each chemical element in high-pressure oil pipe of the present invention is：
C：Martensite formation element, it is the one of the chief elements for improving hardness of steel, it can have by the formation of carbide
Effect ground improves the intensity of steel, and it is low to add cost.When C content is less than 0.11wt.%, seamless steel pipe can not reach 670MPa with
On intensity, but when C content is higher than 0.17wt.%, the low temperature impact properties of seamless steel pipe can be affected.In the present invention
Technical scheme in need the control of the content of C element to be 0.11~0.17wt.%.
Si：It is as reducing agent and deoxidier in steelmaking process, it does not form carbide in steel, and it is in steel
Solid solubility it is larger, the ferrite in steel can be strengthened to improve the intensity of steel.However, when silicone content is more than 0.5wt.%
The low-temperature impact toughness of the toughness, especially steel pipe of steel pipe can then be substantially reduced.Therefore, it should by the control of Si contents for 0.10~
0.5wt.%.
Mn：Martensite formation element, the intensity of steel is mainly improved by solution strengthening.Increase Mn contents can make steel
Phase transition temperature reduces, and reduces phase transformation critical cooling rate, when Mn contents reach more than 1.2wt.%, can significantly increase quenching for steel
Permeability；But, if Mn contents are more than 1.7wt.%, the impact flexibility of steel declines more notable therewith.So in this technology
Need Mn contents being set as 1.2~1.7wt.% in scheme.
Al：In steel have deoxidation and its be favorably improved the toughness of steel and processability.When Al content reaches
During more than 0.01wt.%, it improves the toughness of steel and the effect of processability is more notable, but when Al content exceedes
During 0.05wt.%, steel-making difficulty dramatically increases.The present invention is based on this and by Al content control between 0.01~0.05wt.%.
Nb：Strong carbonitride-forming elements, austenite recrystallization can be postponed and reach crystal grain thinning during hot rolling, again plus
In thermal process, Austenite Grain Growth can be hindered, as Nb contents >=0.01wt.%, this additive effect is obvious, no
During excessive Nb contents ＞ 0.06wt.%, the toughness of steel can decrease on the contrary.Therefore, in the inventive solutions should
Nb contents are set as 0.01~0.06wt.%.
V：The formation element of strong carbide, it is very strong with the binding ability of carbon, and the VC particles of the small and dispersed of formation can
Play a part of dispersion-strengtherning, make the intensity of steel substantially increase.If V content is less than 0.02wt.%, dispersion-strengthened action
And unobvious, but if when V content is more than 0.09wt.%, the toughness of steel declines, therefore, the content for controlling the V in steel is
0.02~0.09wt.%.
Ti：Strong carbonitride-forming elements, austenite can be refined during soaking and reheating by forming TiN, TiC
Crystal grain；If content is too high, thick TiN is easily formed, does not reach the purpose of addition.By weight percentage, preferably using content≤
0.03wt.%.
Mo：Bainite formation element, there is solution strengthening in steel and improve the quenching degree of steel.When Mo contents reach
During 0.05wt.%, can just have significant solution strengthening and improve the effect of quenching degree, it is contemplated that cost factor, preferably use and contain
Measure 0.05~0.2wt.%.
Cr：It is the formation element of middle strong carbide.A part of Cr in steel is replaced as iron and forms alloyed cementite, to carry
Its high stability, another part, which is then dissolved in ferrite, plays solution strengthening effect, improves ferritic intensity and hardness.With this
Meanwhile Cr is also the essential element for the quenching degree for improving steel.Consider addition cost factor, by the present invention Cr control for≤
0.2wt.%.
Cu：The toughness of steel can be strengthened, the even less Cu of content can also obtain corresponding effect, if Cu contents surpass
When crossing 0.3wt.%, considerable influence can be produced to the hot-workability of steel, even if addition complex element cannot guarantee that the heat of steel pipe
Processability, therefore, it is≤0.3wt.% to need the control of Cu contents in the inventive solutions.
Ni：It is both the element of the intensity and quenching degree that can improve steel, is the element for the toughness that can improve steel again.It is comprehensive
The cost factor of steel considers, in the inventive solutions, by the control of Ni contents within the scope of≤0.2wt.%, ability
Preferable invigoration effect is can reach with other elements cooperation and improves the toughness of steel simultaneously.
B：Bainite formation element, tradition improve alloy quenching degree element, are present in carbonitride, or mono- as B
Matter is present in crystal boundary, has the effect for strengthening crystal boundary, effectively improves the combination property of material.If too high levels, analysed along crystal boundary
Go out boride, reduce the toughness of material, preferably using content 0.0005-0.003.
Ca:Cleaning molten steel, make inclusion modification to control sulfide distributional pattern, reach obtain it is tiny it is spherical, disperse is equal
The purpose of the sulfide of cloth, by weight percentage, preferably using 0.001~0.01wt.% of content.
In order to obtain the low-carbon dislocation type martensitic structure of preferable deformability, chemical composition of the present invention is required to meet relation
Formula 4<(B×Mo)/(C×Mn)×104<12.P, S, O, N be hydraulic oil tube steel of the present invention material strictly to control it is harmful
Element, they easily form field trash, on the one hand unfavorable to the intensity and toughness of material, on the other hand, when easily causing cold working
Defect is produced so that fracture, it is therefore necessary to strict limitation, control P≤0.010wt.% as far as possible, O≤0.003wt.%, S≤
0.003wt.%, N≤0.004wt.%.
High-pressure oil pipe alloying element content of the present invention is low, and the production cost of product is low, and it passes through to chemical composition
Optimization design, with reference to rational manufacturing process so that the intensity high and low temperature good toughness of high-pressure oil pipe of the present invention, and
And cost is cheap.
The Fine Texture of Material of the above-mentioned hydraulic oil tube steel of the present invention be preferably ferrite, Dispersed precipitate carbide and return
The sorbitic line and staff control of fire.
A kind of high-pressure oil pipe using high-pressure oil pipe steel making of the present invention, using the hydraulic oil tube steel as pipe
Steel, high-pressure oil pipe is manufactured, its oil pipe wall thickness is 1.5-5.5mm；Its oil pipe external diameter is 5-19mm.
It is a kind of using high-pressure oil pipe steel of the present invention for the method for high-pressure oil pipe, comprise the following steps：
A. all heat-treated will be carried out after pipe heat steel as pipe steel using the hydraulic oil tube steel, obtained
Pipe；It is preferred that after pipe steel are heated into 1200-1260 DEG C, then preferred soaking 30-90min, carries out all heat-treated；
B. the pipe prepared in the step a is subjected to hot piercing, then by stretch-reducing mill, pipe subtracted
Footpath, subtract wall thickness, obtain the rolled main pipe that yield strength is not less than 420MPa, processed to completing to roll rolled main pipe
Afterwards, rolled main pipe is subjected to natural cooling, obtains required steel pipe；
C. pickling, phosphatization, saponification process are carried out again to the steel pipe prepared in the step b, obtains the steel pipe of cleaning；
D. the clean steel pipe prepared in the step c is carried out being cold working to fished pipe size, obtains finished steel
Pipe；It is preferred that carrying out cold working to the steel pipe of cleaning by the way of cold-drawn or cold rolling, fished pipe is prepared, using cold-drawn or cold rolling
Mode by steel pipe be machined to as defined in temper after size, be to reduce caused stress during cold working, make
The performance of tube product reaches preferable level；It is preferred that 750-820 DEG C of air cooling is carried out after every time cold working of steel pipe
Intermediate softening annealing heat-treats, lengthening coefficient≤2.0 of every time cold working of steel pipe are preferably controlled, to ensure steel pipe's production
While efficiency, the defects of steel pipe produces cracking after cold working is avoided；It is preferred that at last one of soft annealing heat of steel pipe
It is 760-800 DEG C to manage temperature, then carries out Water Quenching technique to steel pipe, fished pipe is obtained the mixed of ferrite and martensite
It is charge-coupled to knit, reach the effect of martensite strengthening；It is preferred that last a time cold working lengthening coefficient of control steel pipe is in 1.1-1.4 models
In enclosing, the effect of enough strain hardenings is obtained to ensure steel pipe before final heat treatment, if cold working lengthening coefficient is too low
Just do not reach the effect of strain hardening, and if too high, then steel pipe is easy to ftracture under the compound action of phase transformation strengthening；It is preferred that
It is that wall thickness is 1.5-5.5mm to control the fished pipe size after cold working, and external diameter is preferably 5-19mm；
E. the fished pipe prepared in the step d is subjected to temper, finally gives finished product high-pressure oil pipe.High pressure
When the manufacture of oil pipe carries out temper, it is 500-650 DEG C preferably to control temperature, and tempering insulation time is preferably 30-
90min, air cooling is carried out to fished pipe after being preferably tempered.
The heating-up temperature of temper is too high, or soaking time is long can cause steel pipe to be produced during cold working
High density dislocation disappear, Recovery and recrystallization occurs, while martensite decomposes completely so that the intensity of steel pipe is remarkably decreased.
Martensite can neither be made fully to decompose however, heating-up temperature is too low, residual stress caused by cold working process can not again eliminated,
The low-temperature flexibility for causing material can not be reached into requirement.Here, by the manufacture method of high-pressure oil pipe of the present invention
Temper temperature be set as 500-650 DEG C, and it is 30-90min to control soaking time.
The Fine Texture of Material of hydraulic oil tube steel that the present invention is finally prepared in the step e be preferably ferrite,
The carbide of Dispersed precipitate and the line and staff control of tempered sorbite.The manufacture method of high-pressure oil pipe of the present invention, in last a time
Before cold working, the Cooling Method After Heat-treatment of complexity is not used, but by the Water Quenching of simple economy to obtain martensite
The effect of phase transformation strengthening so that the effect of enough working hardenings is achieved with relatively low cold deformation, so as to return
Burning hot treatment conditions get off to preserve the high density dislocation obtained during cold working, are obtained while dislocation strengthening effect is reached
The effect that martensitic traoformation is strengthened, then cause cold-shaping steel pipe that there is high intensity and good low-temperature toughness.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage：
1. high-pressure oil pipe of the present invention is by adopting the above-described technical solution, so that it possesses high intensity and well tough
Property, its yield strength >=670MPa, tensile strength >=750MPa, elongation percentage ＞ 10%；ISO8535-2016 standards can be met
In define the requirements of 5-6 strength grades；
2. high-pressure oil pipe alloy content of the present invention is few, production cost is low；Meanwhile the manufacture of high-pressure oil pipe of the present invention
Method not only ensure that the production effect of manufacture steel pipe by controlling the sofening treatment temperature and lengthening coefficient of every time cold working
Rate, it also efficiently avoid the cracking of steel pipe.
Brief description of the drawings
Fig. 1 is the microstructure morphology of the high-pressure oil pipe material of the embodiment of the present invention one.
Embodiment
Such scheme is described further below in conjunction with specific examples of the implementation, the preferred embodiments of the present invention are described in detail such as
Under：
1~embodiment of the embodiment of the present invention 7
High-pressure oil pipe material described in 1-7 of the embodiment of the present invention is made using following methods, wherein the chemical element matter of steel pipe
Amount per distribution ratio is as shown in table 1, and A1-A7 corresponds to 1-7, B1-B4 of the embodiment of the present invention and corresponds to comparative example 1-4.
1~embodiment of embodiment 7 is prepared for a kind of high-pressure oil pipe, using hydraulic oil tube steel, the chemistry of its material component
Element percent mass proportioning is：
C：0.11-0.17%；Si：0.1-0.5%；Mn：1.2-1.7%；Al：0.01-0.05%；Nb：0.01-
0.06%；V：0.02-0.09%；Mo：0.05-0.2%；B：0.0005-0.003；Ti：≤ 0.03%；Cr：≤ 0.2%；Ni：
≤ 0.2%；Cu：≤ 0.3%；Ca：0.001-0.01%；Surplus is Fe and other inevitable impurity；And chemical composition
Meet the ＜ of relational expression 4 (B × Mo)/(C × Mn) × 104＜ 12, relational expression each element symbology corresponding element composition is as material
Expect the quality of component.The inevitable impurity of hydraulic oil tube steel of the present invention is mainly S, P, O, N element.
The percent mass proportioning of the A1-A7 of the embodiment of the present invention of table 1. and comparative example B1-B4 chemical element
(wt.%, surplus are Fe and other inevitable impurity)
A kind of method using A1~A7 high-pressure oil pipes steel of the embodiment of the present invention for high-pressure oil pipe, including following step
Suddenly：
A. it is the chemical elements in percentage by mass in steel is as shown in table 1, smelt and hydraulic oil tube steel is made, using institute
Hydraulic oil tube steel is stated as pipe steel, and all heat-treated will be carried out after pipe heat steel, will be managed using rotary heating furnace
Base is heated to 1200 DEG C -1260 DEG C, soaking 30-90min, obtains pipe；
B. vertical conical hot punching machine is used, the pipe prepared in the step a is subjected to hot piercing, then pass through three rollers
Stretch-reducing mill, tube reducing is carried out to pipe, subtracts wall thickness, the mechanical property of hot-rolled pipe is shown in Table 2, obtains yield strength and is not less than
420MPa rolled main pipe, after to completing to the rolling processing of rolled main pipe, rolled main pipe is subjected to natural cooling, obtained
To required steel pipe；
C. pickling, phosphatization, saponification process are carried out again to the steel pipe prepared in the step b, obtains the steel pipe of cleaning；
D. by the way of cold-drawn or cold rolling, the clean steel pipe prepared in the step c is cold working into
Product steel pipe sizes, obtain fished pipe；Then by steel pipe be machined to as defined in temper after size, reduce cold working process
In caused stress, the performance of tube product is reached preferable level；750- is carried out after every time cold working of steel pipe
The intermediate softening annealing heat-treats of 820 DEG C of air cooling, the lengthening coefficient for controlling every time cold working of steel pipe are 1.1-1.4, with
While steel pipe's production efficiency is ensured, the defects of steel pipe produces cracking after cold working is avoided；In the last soft together of steel pipe
Annealing heat treatment temperature be 760-800 DEG C, then to steel pipe carry out Water Quenching technique, make fished pipe obtain ferrite and
The line and staff control of martensite, reach the effect of martensite strengthening；Various embodiments of the present invention use lengthening coefficient as 1.1-1.4,
The effect of enough strain hardenings is obtained to ensure steel pipe before final heat treatment, up to not if cold working lengthening coefficient is too low
To the effect of strain hardening, and if too high, then steel pipe is easy to ftracture under the compound action of phase transformation strengthening；Control cold working
Fished pipe size afterwards is that wall thickness is 1.5-5.5mm, and external diameter is preferably 5-19mm；
E. the fished pipe prepared in the step d is subjected to temper, it is 500-650 DEG C to control temperature,
Tempering insulation time is 30-90min, carries out air cooling to fished pipe after tempering, finally gives finished product high-pressure oil pipe, final tissue
For the line and staff control of ferrite, the carbide of Dispersed precipitate and tempered sorbite, Fig. 1 embodiment A1 tissue is seen.
Before the step d, moreover it is possible to further lift the cold of steel pipe using appropriate intermediate heat-treatment technique
Processing characteristics.
Contrast experiment analyzes
Embodiment 1-6 and specific process parameter in comparative example 1-4 and implementation result are referring to table 2.Table 2 shows embodiment
A1~A7 and the rolled in comparative example B1~B4 mechanical property, table 3 provide the technological parameter of each step of steel.Comparative example
Material preparation method step and step of the present invention are essentially identical.
The embodiment 1-6 of table 2 and the hot-rolled pipe in comparative example 1-4 mechanical property
| Sequence number | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| A1 | 465 | 587 | 30 |
| A2 | 491 | 599 | 29 |
| A3 | 426 | 560 | 22 |
| A4 | 430 | 556 | 21 |
| A5 | 501 | 618 | 29 |
| A6 | 454 | 583 | 27 |
| A7 | 436 | 562 | 23 |
| B1 | 390 | 575 | 24 |
| B2 | 415 | 590 | 27 |
| B3 | 445 | 565 | 22 |
| B4 | 560 | 655 | 27 |
The embodiment 1-6 of table 3. and comparative example 1-4 prepares the contrast of the technological parameter of each step of steel
Table 4 be last a time sofening treatment water quenching after and deformation after mechanical property change, it can be seen that, after water quenching
Yield strength and rolled are suitable, but tensile strength significantly improves, and martensite strengthening effect is clearly；In last subsequent
In road extensional, 1.1-1.4 lengthening coefficient causes the yield strength of steel pipe and tensile strength to be obviously improved, caused strain
Strengthen and the effect of martensite strengthening is very notable.
Mechanics after the embodiment 1-6 of table 4. and the last a time sofening treatment water quenching of comparative example 1-4 preparation methods and after deformation
Performance comparison
In a word, the requirement of 5-6 strength grades is defined in ISO8535-2016 standards, strength grade 5 requires yield strength
>=670MPa, tensile strength >=750MPa, elongation percentage ＞ 10%；Strength grade 6 requires yield strength >=770MPa, tensile strength
>=850MPa, elongation percentage ＞ 8%.The comprehensive mechanical property parameter such as table of the seamless steel pipe of the above embodiment of the present invention obtained
Shown in 5, it be can be seen that with reference to table 1-5 by there is each seamless steel pipe in embodiment A1-A7 technical scheme to be advised
Fixed chemical elements in percentage by mass, and it is processed production according to manufacture method provided by the present invention.Implement
The yield strength of high-pressure oil pipe in example A1-A7 is all higher than 670MPa, it can be seen that, high-pressure oil pipe of the present invention is due to adopting
With above-mentioned technical proposal, the requirement that 5-6 strength grades are defined in ISO8535-2016 standards can be met.
However, because some chemical elements in percentage by mass in each seamless steel pipe in comparative example B1-B4 have surpassed
At least one of technical scheme limited range has been crossed, therefore, in the comprehensive mechanical property of these seamless steel pipes
And the standard of 5-6 strength grade high-pressure oil pipes is not met.
The comprehensive mechanical property parameter comparison of seamless steel pipe prepared by the embodiment 1-6 of table 5. and comparative example 1-4 preparation methods
In a word, the chemical composition of steel pipe of the present invention and existing scheme are entirely different, as shown in Table 6, of the invention
Technical scheme passes through the heat treatment mode of rational composition design+rational cold machining process+optimization, especially last a time
Significant complex intensifying effect is generated by strain hardening and martensite strengthening, then obtained by appropriate destressing tempering
Intensity is high, the seamless steel pipe of good percentage elongation, and Product Process is simple, cost-effective, and such seamless steel pipe is particularly suitable for use in manufacture
The high-pressure oil pipe of high grade requirement is defined in ISO8535-2016 standards.
The comparison (wt%) of the composition of 6. chemical composition of the present invention of table and prior art
In a word, compared to technology of enjoying, the manufacture method of high-pressure oil pipe of the present invention, last a time cold working it
Before, the Cooling Method After Heat-treatment of complexity is not used, but is strengthened by the Water Quenching of simple economy to obtain martensitic traoformation
Effect so that the effect of enough working hardenings is achieved with relatively low cold deformation, so as in tempering heat treatment
Under the conditions of preserve the high density dislocation obtained during cold working, while dislocation strengthening effect is reached obtain martensitic phase
Become the effect strengthened, then cause cold-shaping steel pipe that there is high intensity and good low-temperature toughness.Hydraulic oil of the present invention
Pipe is by adopting the above-described technical solution, so that it possesses high intensity and good toughness, its yield strength >=670MPa,
Tensile strength >=750MPa, elongation percentage ＞ 10%.It can meet to define wanting for 5-6 strength grades in ISO8535-2016 standards
Ask.In addition, high-pressure oil pipe alloy content of the present invention is few, production cost is low.Meanwhile high-pressure oil pipe of the present invention
Manufacture method not only ensure that the life of manufacture steel pipe by controlling the sofening treatment temperature and lengthening coefficient of every time cold working
Efficiency is produced, also efficiently avoid the cracking of steel pipe.
The embodiment of the present invention is illustrated above in conjunction with accompanying drawing, but the invention is not restricted to above-described embodiment, can be with
A variety of changes are made according to the purpose of the innovation and creation of the present invention, under all Spirit Essence and principle according to technical solution of the present invention
Change, modification, replacement, combination or the simplification made, should be equivalent substitute mode, as long as meeting the goal of the invention of the present invention,
Technical principle and inventive concept without departing from hydraulic oil tube steel of the present invention, high-pressure oil pipe and preparation method thereof, are belonged to
Protection scope of the present invention.
Claims (10)
1. a kind of hydraulic oil tube steel, it is characterised in that the chemical elements in percentage by mass of its material component is：
C：0.11-0.17%；Si：0.1-0.5%；Mn：1.2-1.7%；Al：0.01-0.05%；Nb：0.01-0.06%；V：
0.02-0.09%；Mo：0.05-0.2%；B：0.0005-0.003；Ti：≤ 0.03%；Cr：≤ 0.2%；Ni：≤ 0.2%；
Cu：≤ 0.3%；Ca：0.001-0.01%；Surplus is Fe and other inevitable impurity；And chemical composition meets relation
The ＜ of formula 4 (B × Mo)/(C × Mn) × 104＜ 12, relational expression each element symbology corresponding element composition is as material component
Quality.
2. hydraulic oil tube steel according to claim 1, it is characterised in that：Its Fine Texture of Material is ferrite, disperse point
The carbide of cloth and the line and staff control of tempered sorbite.
A kind of 3. high-pressure oil pipe using high-pressure oil pipe steel making described in claim 1, it is characterised in that：Using the high pressure
Oily tube steel manufactures high-pressure oil pipe, its oil pipe wall thickness is 1.5-5.5mm as pipe steel；Its oil pipe external diameter is 5-19mm.
4. it is a kind of using high-pressure oil pipe steel described in claim 1 for the method for high-pressure oil pipe, it is characterised in that including as follows
Step：
A. all heat-treated will be carried out after pipe heat steel as pipe steel using the hydraulic oil tube steel, obtains pipe；
B. the pipe prepared in the step a is subjected to hot piercing, then by stretch-reducing mill, tube reducing is carried out to pipe and subtracts wall
Thickness, seamless steel pipe is obtained, after to completing to process roll seamless steel tube, seamless steel pipe is subjected to natural cooling, obtained required
Steel pipe；
C. pickling, phosphatization saponification process are carried out again to the steel pipe prepared in the step b, obtains the steel pipe of cleaning；
D. the clean steel pipe prepared in the step c is carried out being cold working to fished pipe size, obtains fished pipe；
E. the fished pipe prepared in the step d is subjected to temper, finally gives finished product high-pressure oil pipe.
5. the method for high-pressure oil pipe is prepared according to claim 4, it is characterised in that：In the step d, using cold-drawn or
The mode of cold rolling carries out cold working to the steel pipe of cleaning, prepares fished pipe.
6. the method for high-pressure oil pipe is prepared according to claim 4, it is characterised in that：In the step d, the per pass of steel pipe
The intermediate softening annealing heat-treats of 750-820 DEG C of air cooling are carried out after secondary cold working, control every time cold working of steel pipe to prolong
Stretch coefficient≤2.0.
7. the method for high-pressure oil pipe is prepared according to claim 6, it is characterised in that：In the step d, steel pipe it is last
One of soft annealing heat treatment temperature is 760-800 DEG C, then carries out Water Quenching technique to steel pipe, fished pipe is obtained iron
The line and staff control of ferritic and martensite.
8. the method for high-pressure oil pipe is prepared according to claim 6, it is characterised in that：In the step d, steel pipe is controlled
For last a time cold working lengthening coefficient in the range of 1.1-1.4, it is that wall thickness is to control the fished pipe size after cold working
1.5-5.5mm, external diameter 5-19mm.
9. the method for high-pressure oil pipe is prepared according to any one in claim 4~8, it is characterised in that：In the step a
In, after pipe steel are heated into 1200-1260 DEG C, then soaking 30-90min, carries out all heat-treated.
10. the method for high-pressure oil pipe is prepared according to any one in claim 4~8, it is characterised in that：In the step
In e, when the manufacture of high-pressure oil pipe carries out temper, it is 500-650 DEG C to control temperature, tempering insulation time 30-
90min, air cooling is carried out to fished pipe after tempering.
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| CN107747035B (en) | 2020-06-26 |
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