CN104862591B - Steel for high-strength high-pressure oil pipe, high-pressure oil pipe and manufacturing method of high-pressure oil pipe - Google Patents

Steel for high-strength high-pressure oil pipe, high-pressure oil pipe and manufacturing method of high-pressure oil pipe Download PDF

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CN104862591B
CN104862591B CN201510275354.1A CN201510275354A CN104862591B CN 104862591 B CN104862591 B CN 104862591B CN 201510275354 A CN201510275354 A CN 201510275354A CN 104862591 B CN104862591 B CN 104862591B
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strength
steel
pipe
voltage
oil pipe
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CN104862591A (en
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田青超
左宏志
王伟
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention discloses steel for a high-strength high-pressure oil pipe, which comprises the following chemical elements by mass percent: 0.11-0.17% of C, 0.1-0.5% of Si, 1.2-1.7% of Mn, 0.01-0.05% of Al, 0.01-0.06% of Nb, 0.02-0.09% of V, 0.001-0.03% of Ti, 0.001-0.01% of Ca and the balance of Fe and other inevitable impurities. Correspondingly, the invention further discloses the high-pressure oil pipe manufactured by the steel for the high-strength high-pressure oil pipe. In addition, the invention further discloses a manufacturing method of the oil pipe. The steel for the high-strength high-pressure oil pipe and the high-pressure oil pipe have high strength and good low-temperature toughness.

Description

A kind of high-strength high-voltage oil tube steel, high-pressure oil pipe and its manufacture method
Technical field
The present invention relates to a kind of steel grade and its manufacture method, more particularly to a kind of oily tube steel and its manufacture method.
Background technology
With increasing for world energy sources crisis and environmental pollution, for energy saving, discharge is reduced, new work engine is necessary Using high pressure co-rail system.In common rail fuel combustion system, high pressure fuel is transported to common feeder line by high-pressure oil pump, by right Oil pressure in common feeder line realizes precise control, makes high pressure pipe pressure size unrelated with the rotating speed of electromotor, can be significantly Degree reduces Fuel Injection Mechanism of Diesel Engine pressure with the change of engine speed, makes electromotor obtain very high in all ranges of speeds Fuel pressure, the pressure ratio conventional diesel engine of this injection system will be higher by 3 times, can reach 200MPa (and traditional Fuel Injection Pressure of Diesel Engines is in 60-70MPa).
In whole hydraulic system, the bearing capacity of the injection pressure of continuous improvement to high-pressure oil pipe in use is carried Higher requirement is gone out.High-pressure oil pipe is responsible for conveying high-pressure diesel oil, while high operating pressure is born, also anti-by hydraulic oil The alternative cycle stress of multiple impact, easily produces fatigue failure;High-pressure oil pipe belongs to the tubing for typically bearing inner high voltage simultaneously, The stress that endoporus oil pressure is formed on fuel oil tube section is distributed along pipe thickness and uneven, and the circumference on inner surface of tube wall (is cut To) stress, radial stress be in peak level.Therefore, the longitudinal cracking for originating from fuel pipe bore area is high-pressure oil pipe Possible main failure forms.For this purpose, the material of exploitation higher intensity grade is the effective way for lifting high-pressure oil pipe bearing capacity Footpath.
At present, the ISO8535-1 that European Countries are generally quoted《The effective steel pipe of Diesel engine-high pressure fuel injection first Part:Seamless cold single wall steel pipe is required》The high-pressure oil pipe material of 3 strength grades, the correspondence country trade mark is defined in standard 16Mn, 16MnV etc., high-pressure oil pipe made by which are applicable to the operating pressure of below 160MPa.
In addition, Publication No. CN104141097A, publication date is on November 12nd, 2014, a kind of title " high-pressure oil pipe With hot rolled circular steel and its manufacture method " Chinese patent literature disclose a kind of high-pressure oil pipe, its chemical composition mass percent (wt%) it 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 ferrum With remaining trace impurity.The intensity of the oily tube steel disclosed in the sharp document is less than the technical program.
The content of the invention
It is an object of the invention to provide a kind of high-strength high-voltage oil tube steel, which is meeting more than yield strength 600MPa While also have excellent low-temperature flexibility.
To achieve these goals, the present invention proposes a kind of high-strength high-voltage oil tube steel, its chemical element quality hundred Divide and than content be:
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%;
Ti:0.001-0.03%;
Ca:0.001-0.01%;
Balance of Fe and other inevitable impurity.
The design principle of each chemical element in high-strength high-voltage of the present invention oil tube steel is:
C is the one of the chief elements of the intensity for improving steel, and its formation for passing through carbide can effectively improve the strong of steel Degree, and add low cost.In the technical program, when C content is less than 0.11wt.%, seamless steel pipe can not reach 600MPa Intensity above, but when C content is higher than 0.17%, the low temperature impact properties of seamless steel pipe can be affected.Therefore, at this Invention needs for the content of C element to be controlled to 0.11~0.17%.
Si is that, used as reducing agent and deoxidizer, which does not form carbide in steel, and which is in steel in steelmaking process Solid solubility it is larger, the ferrite in steel can be strengthened to improve the intensity of steel.But in the technical program, once silicone content More than 0.5% toughness that can substantially reduce steel pipe, the especially low-temperature impact toughness of steel pipe.Accordingly, it would be desirable to by Si content controls It is made as 0.10~0.5%.
Mn is mainly by solution strengthening improving the intensity of steel.Increasing Mn contents reduces can the phase transition temperature of steel, subtract Little phase transformation critical cooling rate, when Mn contents reach more than 1.2%, can significantly increase the quenching degree of steel;But, if Mn contents During more than 1.7%, the impact flexibility of steel declines more notable therewith.So need to set Mn contents in the technical program For 1.2~1.7%.
Al has deoxidation in steel and which is favorably improved the toughness and processability of steel.In the technical program, when When Al content reaches more than 0.01%, the effect which improves the toughness and processability of steel is more notable, but when Al content exceedes When 0.05%, steel-making difficulty is dramatically increased.The present invention is based on this and controls Al content between 0.01~0.05%.
Nb is strong carbonitride-forming elements, can postpone austenite recrystallization and reach the work of crystal grain thinning during hot rolling With, during reheating, which can hinder Austenite Grain Growth.In the technical program, when Nb content >=0.01%, Above-mentioned beneficial additive effect is obvious, and when not excessive Nb contents are more than 0.06%, the toughness of steel can be decreased on the contrary.Cause This, Nb contents should be set as 0.01~0.06% by the present invention.
V is the formation element of strong carbide, and which is very strong with the binding ability of carbon, the VC particle energy of its small and dispersed for being formed Enough play a part of dispersion-strengtherning, the intensity of steel is substantially increased.If the content of V is less than 0.02%, its dispersion-strengthened action Not substantially, but if the content of V is more than 0.09%, then the toughness of steel can be caused to decline.For this purpose, the technical program control steel In V content be 0.02~0.09%.
Ti is also strong carbonitride-forming elements, and its TiN, TiC for being formed can be thin during soaking and reheating Change austenite crystal.If however, Ti contents are too high, easily forming thick TiN.Therefore Ti contents are controlled to by the present invention 0.001-0.03%.
Ca can make inclusion modification to control the distributional pattern of sulfide with cleaning molten steel, obtain tiny ball so as to reach The purpose of the uniform sulfide of shape, disperse.In order to realize this purpose, the present invention controls Ca contents for 0.001~0.01%.
In the technical program, inevitable impurity is mainly S, P, O, N element.These impurity elements easily form field trash, The field trash of formation is on the one hand unfavorable to the intensity and toughness of material, produce defect when being on the other hand easily caused cold working so that Fracture, it is therefore necessary to strict to limit.
It is therefore preferred that control P≤0.015%, O≤0.003%, S≤0.005%, N≤0.004% as far as possible.
High-strength high-voltage oil tube steel of the present invention does not contain the relatively costly addition unit such as Mo, Ni or rare earth metal Element, its by the optimization design to chemical composition, with reference to follow-up rational manufacturing process so that high-pressure oil pipe of the present invention Intensity high and low temperature good toughness, it is and with low cost.
Further, the microstructure of high-strength high-voltage oil tube steel of the present invention is the ferrite containing dislocation born of the same parents + tempered sorbite.
Dislocation born of the same parents are born of the same parents' shape substructure that dislocation is formed, and above-mentioned microstructure causes steel of the present invention reaching dislocation strengthening Also there is while effect high intensity and good low-temperature toughness.Dislocation is the dislocation of crystal lattices arrangement.Cold deformation The dislocation fast breeding in metallic crystal, when dislocation density is very high, dislocation tangle can be caused and the Asia of similar cell shape is formed Crystal structure, i.e. dislocation born of the same parents, what the technical term was known for those skilled in that art, therefore here is not described in detail.
Further, the microstructure also Nb with Dispersed precipitate of high-strength high-voltage oil tube steel of the present invention Precipitate, the precipitate of V, the precipitate of Ti at least one.
Further, the precipitate of the Ti includes Ti (C, N) (i.e. the carbonitride of titanium).
Further, the precipitate of the V includes VC.
Further, the precipitate of the Nb includes Nb (C, N) (i.e. the carbonitride of niobium).
Yield strength >=the 600MPa of high-strength high-voltage of the present invention oil tube steel, -20 DEG C of low-temperature impact works >= 34J, elongation percentage > 16%.
Another object of the present invention is to provide a kind of high-strength high-voltage oil pipe, which is seamless steel pipe, and which adopts this paper institutes The high-strength high-voltage oil pipe stated is obtained with steel.
Further, the external diameter of high-strength high-voltage oil pipe of the present invention is 8-10mm, and which is than existing high-pressure oil pipe Caliber it is little.
Further, the wall thickness of high-strength high-voltage oil pipe of the present invention is 1.5-3mm.
A further object of the present invention is to provide a kind of manufacture method of above-mentioned high-strength high-voltage oil pipe, and which includes step:
(1) manufacture pipe;
(2) by soaking after heating of pipe blank;
(3) hot piercing and stretch reducing, then natural cooling;
(4) pickling, phosphatization and saponification;
(5) using cold-drawn or it is cold rolling by the way of carry out cold working;
(6) stress relief annealing.
Further, in the step (1), by heating of pipe blank to 1200 DEG C -1260 DEG C, soaking 30-90min.
Further, in the step (5), carry out the cold working of several passages;Wherein last passage is cold Processing lengthening coefficient is 1.6-2.1, to ensure that steel pipe obtains enough processing hardening effects before final stress relief annealing step Really, the cold worked lengthening coefficient of other passages in addition is more than 0 and is less than or equal to 1.5, so as to ensure steel pipe's production While efficiency, it is to avoid the steel pipe after cold working produces the defects such as cracking;And carry out softening heat between two adjacent passages Process, wherein the softening heat treatment temperature of last passage is 740-800 DEG C, and the type of cooling is cooled down for water smoke, rate of cooling For 5-30 DEG C/s;The softening heat treatment temperature of other passages in addition is 760-800 DEG C, and the type of cooling is air cooling;So as to So that obtaining the intermediate structure of ferrite+bainite after the completion of step (5).
Further, in the step (6), stress relief annealing temperature 500-600 DEG C, temperature retention time are 30-90min.
The heating-up temperature of above-mentioned stress relief annealing is too high, or temperature retention time is long can cause steel pipe in cold working process The dislocation born of the same parents of middle generation disappear so that the intensity of steel pipe is remarkably decreased.However, the temperature of stress relief annealing is too low and can not make cold The residual stress that the course of processing is produced is eliminated, and the low-temperature flexibility for causing material can not be reached use requirement.Here, by the present invention Stress relief annealing temperature in the manufacture method of described high-pressure oil pipe is set as 500-600 DEG C, and controls temperature retention time and be 30-90min。
Alternatively, in the manufacture method of high-strength high-voltage oil pipe of the present invention, step (4) and step (5) Between also have intermediate heat-treatment step, so as to be further ensured that the cold-forming property of steel pipe.
Hydraulic oil tube steel of the present invention is as a result of above-mentioned technical proposal so which is possessing the same of high intensity When also there is good low-temperature flexibility, its yield strength >=600MPa, -20 DEG C of low-temperature impacts absorb work(>=34J, elongation percentage > 16%.
High-strength high-voltage oil pipe of the present invention equally has above-mentioned beneficial effect.Additionally, of the present invention high-strength The caliber of degree high-pressure oil pipe is little, and cost performance is high.
Description of the drawings
During Fig. 1 shows that the steel pipe of embodiment of the present invention A3 is obtained after the softening heat treatment for having carried out last a time Between organize.
Fig. 2 shows the microstructure of the fished pipe of embodiment of the present invention A3.
Fig. 3 amplifies the dislocation cell structure with born of the same parents' shape substructure in the ferrite shown in Fig. 2.
Specific embodiment
Below in conjunction with description of the drawings and specific embodiment to high-strength high-voltage of the present invention oil tube steel, high-strength Degree high-pressure oil pipe and its manufacture method make further explanation, however, the explanation and explanation skill not to the present invention The improper restriction of art forecast scheme configuration.
Embodiment A1-A7 and comparative example B1-B4.
High-strength high-voltage oil pipe and comparative example B1-B4 in embodiments of the invention A1-A7 is manufactured according to the following steps Oil pipe, concrete steps include:
(1) pipe is smelted and makes, the chemical elements in percentage by mass controlled in steel is as shown in table 1;
(2) using rotary heating furnace by heating of pipe blank to 1200 DEG C -1260 DEG C, soaking 30-90min;
(3) hot piercing is carried out using vertical conical hot punching machine, tube reducing is carried out to pipe by three-roller tension reducing mill and is subtracted Natural cooling after wall thickness;
(4) phosphatization saponification again after pickling is carried out to steel pipe;
(5) using cold-drawn or it is cold rolling by the way of carry out the cold working of N number of passage, wherein, first to N-1 passages per pass Secondary cold worked lengthening coefficient≤1.5 (nonzero value), last a time cold working lengthening coefficient in the range of 1.6-2.1, cold rnning Steel pipe finished size after work is wall thickness 1.5-3mm, external diameter 8-10mm;Additionally, also needing to carry out between two adjacent passages Softening heat treatment (i.e. to deforming the heat treatment step softened by ferrite), that is, the cold working for corresponding to N number of passage need to carry out The softening heat treatment of N-1 passage, softening heat treatment (the i.e. softening of N-1 passage before wherein last a time cold working Heat treatment, namely the softening heat treatment of last passage) temperature be 740-800 DEG C, water smoke acceleration is carried out to steel pipe then Cooling, cooling rate 5-30 DEG C/s, to obtain ferrite+bainite structure, the softening heat treatment of other N-2 passage (i.e. first Softening heat treatment of the passage to N-2 passage) temperature be 760-800 DEG C, then air cooling;
(6) stress relief annealing:Stress relief annealing temperature 500-600 DEG C, temperature retention time are air cooling after 30-90min, are obtained into The microstructure of product steel pipe is the ferrite+tempered sorbite containing dislocation born of the same parents.
It should be noted that can also be using appropriate intermediate heat-treatment technique come further before above-mentioned steps (5) Ground ensures the cold-forming property of steel pipe.
Fig. 1 shows the intermediate structure of the steel pipe obtained after last a time heat treatment in embodiment A3, can be with from figure Find out now steel pipe microstructure be ferrite+bainite.
Fig. 2 shows the microstructure of the fished pipe in embodiment A3, it can be seen that the steel pipe finished product is micro- Sight is organized as the ferrite+tempered sorbite containing dislocation born of the same parents.
Fig. 3 further amplifies the dislocation cell structure with born of the same parents' shape substructure in the ferrite shown shown in Fig. 2.
Table 1 lists this case embodiment A1-A7 and the chemical element quality percentage of the steel pipe in comparative example B1-B4 is matched somebody with somebody Than.
Table 1. (wt.%, balance of Fe and other the inevitable impurity in addition to S, O, P, N)
Sequence number C Si Mn Al Nb V Ti Ca P S O N
A1 0.11 0.1 1.5 0.01 0.01 0.09 0.001 0.001 0.009 0.003 0.0016 0.002
A2 0.15 0.5 1.7 0.03 0.03 0.02 0.03 0.002 0.012 0.004 0.0022 0.001
A3 0.14 0.45 1.5 0.05 0.04 0.06 0.005 0.003 0.008 0.001 0.0017 0.003
A4 0.16 0.15 1.3 0.03 0.06 0.03 0.01 0.009 0.014 0.002 0.0018 0.004
A5 0.17 0.2 1.2 0.02 0.05 0.04 0.02 0.01 0.007 0.005 0.0024 0.003
A6 0.13 0.37 1.4 0.02 0.02 0.08 0.002 0.005 0.006 0.004 0.002 0.002
A7 0.12 0.5 1.6 0.02 0.03 0.04 0.02 0.004 0.01 0.005 0.0022 0.004
B1 0.16 0.35 1.4 0 0 0 0 0 0.02 0.01 0.006 0.008
B2 0.16 0.35 1.4 0 0 0.11 0 0 0.02 0.01 0.005 0.007
B3 0.09 0.5 1.6 0.02 0.03 0.04 0.02 0.004 0.01 0.005 0.0022 0.004
B4 0.16 0.35 1.4 0.04 0 0.08 0 0 0.008 0.004 0.005 0.006
Note:Also containing 0.3% Cr elements in B4.
Table 2 shows the specific process parameter of each step in this case embodiment A1~A7 and comparative example B1~B4.
Table 2.
Steel pipe in above-described embodiment and comparative example is produced into the impact that size is 2mm*10mm*55mm along rolling direction Sample, and after the standard v-notch that side opens that depth is 2mm, each impact toughness value row obtained after being tested at -20 DEG C In table 3.Additionally, table 3 also list the intensity of each steel pipe in embodiment and comparative example and elongation percentage.
Table 3.
With reference to table 1, table 2 and table 3 as can be seen that each seamless steel pipe in due to this case embodiment A1-A7 has the present invention Technical scheme defined chemical elements in percentage by mass, and which is carried out according to manufacture method provided by the present invention The yield strength of the high-pressure oil pipe in processing, therefore embodiment A1-A7 is all higher than the equal > of 600MPa, elongation percentage 16%.Separately Outward, the high-pressure oil pipe is in -20 DEG C of the minimum 34J of impact absorbing energy.However, each seamless steel pipe in due to comparative example B1-B4 Some of chemical elements in percentage by mass have been over technical scheme limited range, therefore, these At least one in the comprehensive mechanical property of seamless steel pipe can not reach the implementation result of this case.
Content shown in above table, technical scheme is by rational composition design+rational cold The heat treatment mode of processing technique+optimization, obtains the seamless steel pipe of intensity high and low temperature impact property and good percentage elongation.It is such Seamless steel pipe is particularly suited for manufacturing high-pressure oil pipe.
It should be noted that listed above is only specific embodiment of the invention, it is clear that the invention is not restricted to above reality Example is applied, has the similar change of many therewith.If those skilled in the art directly derive from present disclosure or The all deformations associated, all should belong to protection scope of the present invention.

Claims (13)

1. a kind of high-strength high-voltage oil tube steel, it is characterised in that its microstructure is the ferrite containing dislocation born of the same parents+tempering rope Family name's body, its chemical element mass percentage content 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%;
Ti:0.001-0.03%;
Ca:0.001-0.01%;
Balance of Fe and other inevitable impurity.
2. high-strength high-voltage as claimed in claim 1 oil tube steel, it is characterised in that its microstructure also has Dispersed precipitate The precipitate of Nb, the precipitate of V, the precipitate of Ti at least one.
3. high-strength high-voltage as claimed in claim 2 oil tube steel, it is characterised in that the precipitate of the Ti include Ti (C, N)。
4. intensity hydraulic oil tube steel as claimed in claim 2, it is characterised in that the precipitate of the V includes VC.
5. intensity hydraulic oil tube steel as claimed in claim 2, it is characterised in that the precipitate of the Nb includes Nb (C, N).
6. high-strength high-voltage as claimed in claim 1 oil tube steel, it is characterised in that the P in the inevitable impurity ≤ 0.015%, O≤0.003%, S≤0.005%, N≤0.004%.
7. high-strength high-voltage as claimed in claim 1 oil tube steel, it is characterised in that its yield strength >=600MPa, -20 DEG C Low-temperature impact work >=34J, elongation percentage > 16%.
8. a kind of high-strength high-voltage oil pipe, which is seamless steel pipe, it is characterised in which is adopted as any one in claim 1-7 High-strength high-voltage oil pipe described in is obtained with steel.
9. high-strength high-voltage oil pipe as claimed in claim 8, it is characterised in that its external diameter is 8-10mm.
10. high-strength high-voltage oil pipe as claimed in claim 9, it is characterised in that its wall thickness is 1.5-3mm.
The manufacture method of 11. high-strength high-voltage oil pipes as claimed in claim 8, which includes step:
(1) manufacture pipe;
(2) by soaking after heating of pipe blank;
(3) hot piercing and stretch reducing, then natural cooling;
(4) pickling, phosphatization and saponification;
(5) using cold-drawn or it is cold rolling by the way of carry out cold working;Wherein in the step (5), the cold of several passages is carried out Processing;Wherein the cold working lengthening coefficient of last passage is 1.6-2.1, and the cold worked of other passages in addition is prolonged Coefficient is stretched more than 0 and less than or equal to 1.5;And softening heat treatment is carried out between two adjacent passages, wherein last road Secondary softening heat treatment temperature is 740-800 DEG C, and the type of cooling is cooled down for water smoke, and rate of cooling is 5-30 DEG C/s;In addition Other passages softening heat treatment temperature be 760-800 DEG C, the type of cooling is air cooling;So that after the completion of step (5) Obtain the intermediate structure of ferrite+bainite;
(6) stress relief annealing:Stress relief annealing temperature 500-600 DEG C, temperature retention time are 30-90min.
The manufacture method of 12. high-strength high-voltage oil pipes as claimed in claim 11, it is characterised in that in the step (1), By heating of pipe blank to 1200 DEG C -1260 DEG C, soaking 30-90min.
The manufacture method of 13. high-strength high-voltage oil pipes as claimed in claim 11, it is characterised in that step (4) and step Suddenly also there is between (5) intermediate heat-treatment step.
CN201510275354.1A 2015-05-26 2015-05-26 Steel for high-strength high-pressure oil pipe, high-pressure oil pipe and manufacturing method of high-pressure oil pipe Active CN104862591B (en)

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CN109926462A (en) * 2018-04-16 2019-06-25 万向钱潮股份有限公司 Hollow axis production technology of steel tube of swaging
CN110616365A (en) * 2018-06-20 2019-12-27 宝山钢铁股份有限公司 High-strength expansion casing pipe and manufacturing method thereof
CN110760749A (en) * 2018-07-27 2020-02-07 宝山钢铁股份有限公司 Seamless steel tube for high-pressure oil pipe of automobile engine and manufacturing method thereof
CN109604342A (en) * 2018-11-14 2019-04-12 张家港华程特种材料股份有限公司 A kind of processing method of seamless steel pipe
CN109457098A (en) * 2018-12-28 2019-03-12 江苏建中新材料科技有限公司 A kind of process improving mild steel steel strength
CN109778064A (en) * 2019-01-11 2019-05-21 包头钢铁(集团)有限责任公司 A kind of economical 555MPa grades of seamless steel pipes and preparation method thereof

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