CN109576568A - A kind of high-strength weldable casing and its manufacturing method - Google Patents
A kind of high-strength weldable casing and its manufacturing method Download PDFInfo
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- CN109576568A CN109576568A CN201710893928.0A CN201710893928A CN109576568A CN 109576568 A CN109576568 A CN 109576568A CN 201710893928 A CN201710893928 A CN 201710893928A CN 109576568 A CN109576568 A CN 109576568A
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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
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of high-strength weldable casing, chemical element mass percents are as follows: C:0.04~0.12%, Si:0.1%~0.5%, Mo:0.1~0.5%, V:0.03~0.12%, Mn:1.2%~2.5%, surplus are Fe and other inevitable impurity；Wherein, the high-strength weldable casing contains the bainite of Phase Proportion >=80%.In addition, the invention also discloses a kind of manufacturing method of above-mentioned high-strength weldable casing, comprising steps of (1) smelts, refines and casts；(2) forging or rolling pipe；(3) hollow forging is made in pipe；(4) quenching+tempering is heat-treated: wherein hardening heat is 920~1000 DEG C, keeps the temperature 0.3~1h, then be rapidly cooled, and controls average 15~100 DEG C/s of cooling rate, final cooling temperature≤200 DEG C.The high-strength weldable casing strength is high, good toughness, excellent performance after welding.
Description
Technical field
The present invention relates to a kind of casing and its manufacturing method more particularly to a kind of casing that can be used for oil exploitation and its systems
Make method.
Background technique
Petroleum casing pipe is the steel pipe for being used to support oil, the gas well borehole wall, to guarantee that drilling process carries out and oil entire after complete well
The normal operation of well.Traditional petroleum casing pipe, which generallys use screw thread and connects two-by-two, goes into the well, and casing deformation, screw thread damage is occurring
When, junction easily leaks.
Therefore, it is desirable to obtain a kind of casing, which is gone into the well no longer using threaded connection using butt welding mode.
However, underground stress is complicated using the casing of butt welding mode due to geological conditions difference, tensile, compressive, bending,
Torsional stress comprehensive function is in tube body, complicated to cope with it is then desired to sleeve body and welding position obdurability with higher
Military service operating condition.
Therefore, for the casing that welding is gone into the well, on the one hand for alloy system, need to limit material with lower
Welding crack sensibility, to guarantee weldquality.Simultaneously as the influence of welding process, conventional quenched and tempered steel will appear welding
The case where heat affected area performance declines (is commonly called as welding softening), this is because conventional quenched structure of steel is usually tempered martensite group
It knits, after the reaustenitizing of welding process, heat affected zone organization occurs caused by larger change with respect to matrix.
Publication No. FR2042909A5, publication date are on 2 12nd, 1971, entitled " Welding vertical
The french patent document of well casing tubes " discloses a kind of casing gone into the well for straight well welding, but the patent document
Disclosed technical solution do not refer to for weld shell material under operating condition of going into the well and performance how design problem.
Summary of the invention
One of the objects of the present invention is to provide a kind of high-strength weldable casing, the high-strength weldable casing strengths
Height, good toughness are gone into the well suitable for casing welding connecting mode.
In order to achieve the purpose that foregoing invention, the present invention provides a kind of high-strength weldable casing, chemical element matter
Measure percentage are as follows:
C:0.04~0.12%, Surplus is Fe and other inevitable impurity；
Wherein, the high-strength weldable casing contains the bainite of Phase Proportion >=80%.
In technical solutions according to the invention, other inevitable impurity elements mainly include P, S and O element,
In can control P≤0.02%, S≤0.008%, O≤0.01%.
Inventor is by the way that the study found that being arranged in pairs or groups by reasonable alloying element, the bainite of available refinement is
On the other hand main tissue can make on the one hand the intensity of the high-intensity welding casing be made to be increased to 80ksi
High-intensity welding casing property variation after welding is also obviously small compared with conventional steel such as martensite steel, reaches high-strength tenacity
With the balance of high solderability, the needs gone into the well are welded to meet casing.
The design principle of each chemical element in high-strength weldable casing of the present invention is as described below:
C:C is conducive to improve the intensity of steel, but C can improve the welding crack sensibility of steel strongly, while can improve Ms point,
Increase the tendency that steel forms martensite, therefore intensity and solderability in order to guarantee steel, and bainite structure is made to meet this skill
The requirement of art scheme, it is necessary to limit C 0.04~0.12%.
Si:Si is that the element brought into steel by deoxidier can dramatically increase the cold short of steel when content is more than 0.5%
Tendency, therefore Si content should be limited 0.5% hereinafter, needing to keep Si 0.1% or more furthermore in order to guarantee deoxidation effect.
Mo: in technical solutions according to the invention, Mo postpones overcooling austenite to perlitic transformation, for being formed strongly
Tissue based on bainite is highly beneficial, while Mo has preferable solid solution strengthening effect, is conducive to the performance for promoting steel.Therefore
It needs to be added a certain amount of Mo, according to the requirement of tissue and Properties Control, needs to be added the Mo of 0.1% or more mass percent.
In addition, the considerations of for welding crack sensibility to steel, be limited to 0.5% or less for the mass percent of Mo.Therefore, at this
The mass percent of Mo is controlled in the invention high-strength weldable casing 0.1~0.5%.
V: in high-strength weldable casing of the present invention, V is primarily served in bainitic steel when quenching phase transformation
It is precipitated, refines bainite grain structure, and be precipitated in drawing process.The effect of precipitation strength in order to obtain, the matter that V is added
Amount percentage needs effectively be precipitated more than 0.03%, while when the mass percent of V is more than 0.12%, will form coarse
Carbide influences the toughness of steel, and therefore, the mass percent that V is controlled in high-strength weldable casing of the present invention exists
0.03~0.12%.
Mn:Mn, which has, expands austenite phase field, increases harden ability, the beneficial effects such as refinement crystal grain.For the technical program
For, since C content is in reduced levels, it is therefore desirable to enough Mn be added to improve solid solution strengthening effect, but Mn contains simultaneously
After amount is more than a certain amount of, apparent influence can be generated on the hot-working character of steel, is studied according to the present invention, the control of Mn content exists
1.2%~2.5% is more suitable for.
S:S is the harmful element in steel, and existing has unfavorable shadow for the corrosion resistance, hot-workability, toughness etc. of steel
It rings, it is more lower better that therefore, it is necessary to the mass percents of S, in technical solutions according to the invention, controls the mass percent of S
For S≤0.008%.Preferably, the mass percent of S is controlled in S≤0.003%, it is further preferable that the quality percentage of control S
Than for S≤0.002%.
P:P is the harmful element in steel, exists and corrosion resistance, the toughness etc. of steel are all adversely affected, and therefore, is needed
Want the mass percent of P more lower better, in technical solutions according to the invention, control P mass percent be P≤
0.02%.Preferably, the mass percent of P is controlled in P≤0.012%.
O:O will form various oxides in steel and be mingled with, and have adverse effect to toughness, should strictly limit the quality percentage of O
Than.In technical solutions according to the invention, the mass percent for controlling O is O≤0.01%.Preferably, the quality hundred of O is controlled
Divide than being O≤0.005%.
Further, in high-strength weldable casing of the present invention, also meet: C/Mn≤0.07, wherein C and Mn
Indicate its mass percent.
In above scheme, the ratio of C/Mn is controlled, in the case where solid solution strengthening effect difference is little, can be effectively reduced
Overcooling austenite help to obtain the quenching structure based on bainite to the tendency of martensite transfor mation.
It should be noted that numerical value when C and Mn substitute into above-mentioned restriction formula should substitute into the numerical value before percentage sign, such as
When the mass percent that the mass percent of C is 0.09%, Mn is 1.86%, then numerical value when substituting into formula is respectively 0.09 He
The numerical value of 1.86, obtained C/Mn are 0.048.
Further, in high-strength weldable casing of the present invention, also meet: 20 × C+Mn >=2.5, wherein C
Its mass percent is indicated with Mn.
In above-mentioned restriction formula, numerical value when C and Mn substitute into above-mentioned restriction formula should substitute into the numerical value before percentage sign,
Such as when the mass percent that the mass percent of C is 0.09%, Mn is 1.86%, then numerical value when substituting into formula is respectively
0.09 and 1.86, the numerical value for calculating obtained 20 × C+Mn is 3.66.
Further, in high-strength weldable casing of the present invention, welding crack sensibility indices P cm≤
0.24, wherein Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B, each element indicates in formula
Its respective mass percent.
It should be noted that numerical value when each element substitutes into above-mentioned restriction formula should substitute into the numerical value before percentage sign, example
Such as when the matter that the mass percent that the mass percent that the mass percent of C is 0.09%, Mn is 1.86%, Mo is 0.26%, V
Measuring the mass percent that percentage is 0.04%, Si is 0.24%, and when no addition Cu, Ni, Cr and B, then Pcm=0.09+
0.24/30+1.86/20+0/20+0/60+0/20+0.26/15+0.04/10+5 × 0=0.208.
Further, in high-strength weldable casing of the present invention, yield strength >=550MPa, 0 DEG C of full ruler
Very little ballistic work >=50J.
Further, in high-strength weldable casing of the present invention, welding region yield strength >=550MPa,
0 DEG C of welding region full-scale ballistic work >=50J.
Further, in high-strength weldable casing of the present invention, the high-strength weldable casing it is microcosmic
Tissue is bainite+pro-eutectoid ferrite.
In above scheme, distortion of lattice degree is smaller when bainite structure is due to phase transformation, and carbide is when austenite changes
Just most of to be precipitated, welding region heat affecting is smaller on the influence of its structure property, thus, microstructure is the high-strength of bainite
Solderable casing is spent to use more suitable for welding.
Correspondingly, another object of the present invention is to provide a kind of manufacturing method of above-mentioned high-strength weldable casing,
The manufacturing method is cold when especially control quenches to go speed by controlling the technological parameter in each step, to obtain final return
High-strength weldable casing of the fire tissue based on bainite, yield strength >=550MPa of acquired casing.
In order to achieve the purpose that foregoing invention, the present invention provides a kind of manufacturers of above-mentioned high-strength weldable casing
Method, comprising steps of
(1) it smelts, refine and casts；
(2) forging or rolling pipe；
(3) hollow forging is made in pipe；
(4) quenching+tempering is heat-treated: wherein hardening heat is 920~1000 DEG C, keeps the temperature 0.3~1h, then carry out fast quickly cooling
But, average 15~100 DEG C/s of cooling rate, final cooling temperature≤200 DEG C are controlled.
In manufacturing method of the present invention, since the steel grade Ac3 of this case is usually at 890 DEG C hereinafter, therefore, quenching is warm
Degree needs to be higher than 30 DEG C of Ac3 temperature or more.It grows up however, will lead to crystal grain when hardening heat is more than 1000 DEG C, influences steel
Obdurability, therefore, manufacturing method control hardening heat of the present invention is 920~1000 DEG C.
In addition, controlling soaking time in 0.3~1h according to the pipe thickness of high-strength weldable casing, then carry out fast quickly cooling
But.Water cooling can be used for rapid cooling or oil is cold is handled, average 15~100 DEG C/s of cooling rate, final cooling temperature≤200 DEG C, from
And the high-strength weldable casing of Phase Proportion high (such as bayesian phase fraction >=80%) can be obtained.
Further, in manufacturing method of the present invention, in step (3), heating of pipe blank is arrivedIt keepsAfter hour, perforated, tandem rolling, stretch reducing or sizing, hollow forging is made.
According to the condition of different Hot Rolling Mills, heating temperature is controlled at 1150~1300 DEG C, temperature is not less than 1150 DEG C
It is to guarantee to have enough deformabilities, and it is then that burning occurs in order to prevent that temperature, which is no more than 1300 DEG C,.
Further, in manufacturing method of the present invention, in step (4), tempering temperature is controlled
In above scheme, tempering temperature control at 500~680 DEG C, be because when tempering temperature be higher than 680 DEG C when, this case
Steel grade system intensity will appear violent decline, thus, in order to guarantee the intensity of the high-strength weldable casing, control back
Fiery temperature is not higher than 680 DEG C, to eliminate as much as internal stress under the premise of proof strength, obtains enough toughness.
High-strength weldable casing of the present invention is arranged in pairs or groups by reasonable alloying element, and is aided with heat treatment appropriate
Condition obtains the tissue based on the bainite with refinement, so that high-strength weldable casing of the present invention is on the one hand
80Ksi rank can be improved in intensity, and the performance change after on the other hand welding is also obviously small compared with martensite steel, to reach high
The balance of obdurability and high solderability meets casing and welds the needs gone into the well.
High-strength weldable casing of the present invention, yield strength >=550MPa, 0 DEG C of full-scale ballistic work >=50J,
And the casing welding region yield strength >=550MPa, 0 DEG C of welding region full-scale ballistic work >=50J.
In addition, manufacturing method of the present invention provide it is a kind of have a high-intensitive and low welding crack sensibility can
Welding casing may be used in the oil/gas well that welding manner substitution screw joint casing is gone into the well.
Detailed description of the invention
Fig. 1 is the micro-organization chart of the high-strength weldable casing of embodiment 6.
Specific embodiment
It below will according to specific embodiment and Figure of description is to high-strength weldable casing of the present invention and its system
The method of making is described further, but the explanation does not constitute the improper restriction to technical solution of the present invention.
Embodiment 1-6 and comparative example 1-5
Table 1 lists each chemistry in the high-strength weldable casing of embodiment 1-6 and the comparison casing of comparative example 1-5
The mass percent of element.
Table 1. (wt%, surplus are Fe and other inevitable impurity elements other than P, S and O)
| Number | C | Si | Mn | Mo | P | S | O | V | 20×C+Mn | C/Mn | Pcm |
| Embodiment 1 | 0.09 | 0.24 | 1.86 | 0.26 | 0.015 | 0.002 | 0.004 | 0.04 | 3.66 | 0.048 | 0.208 |
| Embodiment 2 | 0.07 | 0.18 | 1.85 | 0.38 | 0.015 | 0.006 | 0.002 | 0.07 | 3.25 | 0.038 | 0.199 |
| Embodiment 3 | 0.06 | 0.46 | 1.53 | 0.43 | 0.015 | 0.004 | 0.004 | 0.09 | 2.73 | 0.039 | 0.191 |
| Embodiment 4 | 0.08 | 0.16 | 1.54 | 0.44 | 0.015 | 0.002 | 0.005 | 0.11 | 3.14 | 0.052 | 0.206 |
| Embodiment 5 | 0.09 | 0.21 | 2.16 | 0.26 | 0.015 | 0.007 | 0.004 | 0.04 | 3.96 | 0.042 | 0.223 |
| Embodiment 6 | 0.04 | 0.2 | 2.34 | 0.46 | 0.015 | 0.003 | 0.006 | 0.05 | 3.14 | 0.017 | 0.197 |
| Comparative example 1 | 0.05 | 0.2 | 1.15 | 0.44 | 0.015 | 0.002 | 0.004 | 0.07 | 2.15 | 0.037 | 0.157 |
| Comparative example 2 | 0.1 | 0.2 | 1.24 | 0.96 | 0.032 | 0.015 | 0.005 | 0.06 | 3.24 | 0.081 | 0.236 |
| Comparative example 3 | 0.08 | 0.16 | 1.54 | 0.44 | 0.015 | 0.002 | 0.005 | 0.08 | 3.14 | 0.052 | 0.196 |
| Comparative example 4 | 0.08 | 0.16 | 1.54 | 0.44 | 0.015 | 0.002 | 0.005 | 0.08 | 3.14 | 0.052 | 0.196 |
| Comparative example 5 | 0.08 | 0.16 | 1.54 | 0.44 | 0.015 | 0.002 | 0.005 | 0.08 | 3.14 | 0.052 | 0.196 |
Note: Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B in table 1, each element in formula
Indicate its respective mass percent.
The high-strength weldable casing of embodiment 1-6 and the comparison casing of comparative example 1-5 include the following steps:
(1) it smelts, refine and casts；
(2) forging or rolling pipe；
(3) hollow forging is made in pipe: by heating of pipe blank to 1150~1300 DEG C keep 1~4 hour after, perforated, tandem rolling,
Stretch reducing or sizing, hollow forging is made；
(4) quenching+tempering is heat-treated: wherein hardening heat is 920~1000 DEG C, keeps the temperature 0.3~1h, then carry out fast quickly cooling
But, average 15~100 DEG C/s of cooling rate, final cooling temperature≤200 DEG C are controlled, control tempering temperature is 500~680 DEG C.
It should be noted that specific process parameter and above-mentioned steps are unsatisfactory in the step of comparative example 3-5 (4), it is specific
Parameter can be found in table 2.
Table 2 lists the manufacturing method of the high-strength weldable casing of embodiment 1-6 and the comparison casing of comparative example 1-5
In specific process parameter.
Table 2.
Note: the high-strength weldable casing of each embodiment and the comparison casing of comparative example is completely cooled down to room in table 2
Warm spent time is carried out using even buried test.
The comparison casing of high-strength weldable casing and comparative example 1-5 to embodiment 1-6 has carried out performance measurement, and
It will the results are shown in tables 3.
Wherein, yield strength data is that the casing of manufactured each embodiment and comparative example is processed into API arc sample, is pressed
API standard is averaged after examining and obtains；
Full-scale Charpy V-type impact absorbing energy data are to take sectional area on the casing of manufactured each embodiment and comparative example
For the full-scale V-type impact specimen of 10*10*55, obtained by being averaged after 229 standard test of GB/T；
Microstructure is used after taking total wall thickness sample sanding and polishing from the sample pipe of the casing of each embodiment and comparative example
It is obtained under the microscope after the corrosion of 4% nitric acid alcohol in metallography microscope.
Table 3 lists the performance test of the high-strength weldable casing of embodiment 1-6 and the comparison casing of comparative example 1-5
As a result.
Table 3
As can be seen from Table 3, the high-strength weldable casing of each embodiment of this case contains the bainite of Phase Proportion >=80%,
Yield strength >=550MPa of each embodiment, 0 DEG C of full-scale ballistic work >=50J, and its welding region yield strength >=
550MPa, 0 DEG C of welding region full-scale ballistic work >=50J.And the performance of the comparison casing of each comparative example is not as good as this case
Each embodiment.
In conjunction with table 1 to table 3 as can be seen that in comparative example 1, since Mn constituent content is too low, and 20C+Mn < 2.5, cause
Its solid solution strengthening effect is insufficient, while influencing bayesian phase fraction, causes yield strength insufficient, and performance is poor after welding, uncomfortable
It goes into the well for welding.In comparative example 2, since the mass percent of Mo in comparison casing is higher, and C/Mn > 0.07 causes pair
Than the Phase Proportion < 80% of the bainite of casing, although toughness is insufficient, weldering so that the yield strength of comparison casing is higher
It is poor to connect rear performance, is not suitable for welding and goes into the well；In comparative example 3, since hardening heat is low in the fabrication process for comparison casing,
So as to cause the Phase Proportion < 80% of bainite, comparison casing yield strength is not high, and performance is poor after welding, is not suitable for welding
It goes into the well；In comparative example 4, due to comparison casing in the fabrication process quench be averaged cooling rate it is too low, so as to cause the phase of bainite
Ratio < 80%, comparison casing yield strength is not high, and performance is poor after welding, is not suitable for welding and goes into the well；In comparative example 5,
Since final cooling temperature is excessively high in the fabrication process for comparison casing, so as to cause the Phase Proportion < 80% of bainite, compares casing and bend
It is not high to take intensity, performance is poor after welding, is not suitable for welding and goes into the well.
Fig. 1 is the micro-organization chart of the high-strength weldable casing of embodiment 6.
As shown in Figure 1, the microstructure of the high-strength weldable casing of embodiment 6 is bainite+pro-eutectoid ferrite.
It should be noted that prior art part is not limited to given by present specification in protection scope of the present invention
Embodiment, all prior arts not contradicted with the solution of the present invention, including but not limited to first patent document, formerly
Public publication, formerly openly use etc., it can all be included in protection scope of the present invention.
In addition, in this case in the combination of each technical characteristic and unlimited this case claim documented combination or
It is combination documented by specific embodiment, all technical characteristics that this case is recorded can be freely combined in any way
Or combine, unless generating contradiction between each other.
It is also to be noted that embodiment enumerated above is only specific embodiments of the present invention.The obvious present invention is not
Above embodiments are confined to, the similar variation or deformation made therewith are that those skilled in the art can be from present disclosure
It immediately arrives at or is easy to just to associate, be within the scope of protection of the invention.
Claims (10)
1. a kind of high-strength weldable casing, which is characterized in that its chemical element mass percent are as follows:
C:Si:Mo:V:Mn:Surplus is Fe and other inevitable impurity；
Wherein, the high-strength weldable casing contains the bainite of Phase Proportion >=80%.
2. high-strength weldable casing as described in claim 1, which is characterized in that also meet: C/Mn≤0.07, wherein C and
Mn indicates its mass percent.
3. high-strength weldable casing as described in claim 1, which is characterized in that also meet: 20 × C+Mn >=2.5, wherein C
Its mass percent is indicated with Mn.
4. high-strength weldable casing as described in claim 1, which is characterized in that its welding crack sensibility indices P cm≤
0.24, wherein Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B, each element indicates in formula
Its respective mass percent.
5. high-strength weldable casing as described in claim 1, which is characterized in that its yield strength >=550MPa, 0 DEG C of full ruler
Very little ballistic work >=50J.
6. high-strength weldable casing as described in claim 1, which is characterized in that its welding region yield strength >=
550MPa, 0 DEG C of welding region full-scale ballistic work >=50J.
7. high-strength weldable casing as described in claim 1, which is characterized in that the high-strength weldable casing it is microcosmic
Tissue is bainite+pro-eutectoid ferrite.
8. the manufacturing method of the high-strength weldable casing as described in any one of claim 1-7, which is characterized in that including
Step:
(1) it smelts, refine and casts；
(2) forging or rolling pipe；
(3) hollow forging is made in pipe；
(4) quenching+tempering is heat-treated: wherein hardening heat isHeat preservation Fast quickly cooling is carried out again
But, average cooling rate is controlledFinal cooling temperature≤200 DEG C.
9. manufacturing method as claimed in claim 8, which is characterized in that in step (3), heating of pipe blank is arrivedIt keepsAfter hour, perforated, tandem rolling, stretch reducing or sizing, hollow forging is made.
10. manufacturing method as claimed in claim 8, which is characterized in that in step (4), control tempering temperature
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910127A (en) * | 2020-08-07 | 2020-11-10 | 安阳钢铁股份有限公司 | Q890 steel plate for hydraulic support meeting welding heat input of 30kJ/cm and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09165620A (en) * | 1995-12-14 | 1997-06-24 | Nkk Corp | Production of building use thick fire resistant steel tube low in yield ratio |
| JP2008274405A (en) * | 2007-03-30 | 2008-11-13 | Jfe Steel Kk | High-strength steel sheet excellent in sr resistant property and deformation performance, and method for manufacturing the same |
| CN106555107A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of manufacture method and bainite type high-strength seamless steel pipe of bainite type high-strength seamless steel pipe |
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| JPH09165620A (en) * | 1995-12-14 | 1997-06-24 | Nkk Corp | Production of building use thick fire resistant steel tube low in yield ratio |
| JP2008274405A (en) * | 2007-03-30 | 2008-11-13 | Jfe Steel Kk | High-strength steel sheet excellent in sr resistant property and deformation performance, and method for manufacturing the same |
| CN106555107A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of manufacture method and bainite type high-strength seamless steel pipe of bainite type high-strength seamless steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111910127A (en) * | 2020-08-07 | 2020-11-10 | 安阳钢铁股份有限公司 | Q890 steel plate for hydraulic support meeting welding heat input of 30kJ/cm and preparation method thereof |
| CN111910127B (en) * | 2020-08-07 | 2022-02-22 | 安阳钢铁股份有限公司 | Q890 steel plate for hydraulic support meeting welding heat input of 30kJ/cm and preparation method thereof |
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