CN109112394A - A kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation method - Google Patents
A kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation method Download PDFInfo
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- CN109112394A CN109112394A CN201810876251.4A CN201810876251A CN109112394A CN 109112394 A CN109112394 A CN 109112394A CN 201810876251 A CN201810876251 A CN 201810876251A CN 109112394 A CN109112394 A CN 109112394A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention discloses a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation methods, the chemical component of the pipe line steel includes: that the weight percent of C is 0.07~0.09%, the weight percent of Si is 0.20~0.30%, the weight percent of Mn is 1.30~1.50%, the weight percent of Alt is 0.01~0.03%, the weight percent of P is≤0.015%, the weight percent of S is≤0.005%, the weight percent of Nb is 0.015~0.035%, the weight percent of Ti is 0.01~0.02%, the weight percent of Cr is 0.20~0.30%, the weight percent of N is≤0.008%, surplus is Fe and inevitable impurity element.It solves quenched and tempered state X60Q pipe line steel in the prior art and requires the low stubborn technical problem that than, low-temperature flexibility to stablize difficulty larger.It is good to have reached quenched and tempered state low yield strength ratio X60Q pipe line steel comprehensive performance provided by the invention, there is low yield strength ratio and low-temperature good toughness, has been applicable to the technical effect of the pipe-line construction in some areas such as Africa, Middle East.
Description
Technical field
The present invention relates to technical field of pipeline steel more particularly to a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation sides
Method.
Background technique
Pipe-line is usually delivered goods with pipe line steel with thermo-mechanical rolling (TMCP) state, but some in Africa, the Middle East etc.
Area, due to the difference of transport environment and medium, owner also can be using the pipe line steel of part quenched and tempered state (Q+T) delivery.
From the point of view of the market demand, the X60Q pipeline of Africa Algeria one phase of pipeline, 1708 tons of quenched and tempered states of project demands
Steel.From the point of view of the Algerian pipeline projects technical conditions of quenched and tempered state X60Q pipe line steel, owner proposes harsh technology
It is required that main technical requirements of the quenched and tempered state X60Q pipe line steel project for material are as follows: 1, how to meet the property of steel plate low yield strength ratio
It can require, the maximum value of yield tensile ratio Rt0.5/Rm is no more than 0.85；2, lateral -25 DEG C of section of shear >=85% that drop hammer of steel plate, especially
It is the stability of -25 DEG C of low-temperature flexibilities in batch production process；3, steel plate Vickers hardness number HV10≤235.
Above-mentioned requirements are mainly reflected in low yield strength ratio and low-temperature flexibility, and difficulty is larger, this just needs the reasonable ingredient of steel plate
Design and Design of Heat Treatment Process.
Summary of the invention
The present invention provides a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation methods, to solve in the prior art
Quenched and tempered state X60Q pipe line steel requires low yield strength ratio, low-temperature flexibility stablizes the larger technical problem of difficulty.
To solve the above-mentioned problems, in a first aspect, the embodiment of the invention provides a kind of quenched and tempered state low yield strength ratio X60Q pipes
Line steel, the chemical component of the pipe line steel include: C weight percent be 0.07~0.09%, Si weight percent be
The weight percent of 0.20~0.30%, Mn are that the weight percent of 1.30~1.50%, Alt is the weight of 0.01~0.03%, P
The weight percent that the weight percent that amount percentage is≤0.015%, S is≤0.005%, Nb is 0.015~0.035%,
The weight percent that the weight percent that the weight percent of Ti is 0.01~0.02%, Cr is 0.20~0.30%, N be≤
0.008%, surplus is Fe and inevitable impurity element.
Preferably, the average value of lateral -25 DEG C of ballistic works of the pipe line steel is greater than 405J.
Preferably, laterally -25 DEG C of sections of shear of dropping hammer are 95%~100% to the pipe line steel, and yield tensile ratio is less than or equal to
0.80, vickers hardness hv 10 is less than or equal to 215.
Preferably, it is tiny polygonal ferrite and ferrite bainite group that the pipe line steel, which rolls the metallographic structure of state steel plate,
It knits.
Preferably, the metallographic structure after the pipe line steel is quenched is tempered sorbite tissue or ferrite and tempered sorbite
Tissue.
Second aspect, the embodiment of the invention provides a kind of preparation method of quenched and tempered state low yield strength ratio X60Q pipe line steel, packets
Include smelting, continuous casting, reheating, rolling, cooling, heat treatment procedure, which comprises steel plate controlled rolling in two stages, the first rank
Section start rolling temperature is 950~1150 DEG C, is then carried out to temperature, to 2~4 times that temperature thickness is finished steel plate thickness, second stage
Start rolling temperature is 860~880 DEG C, and finishing temperature control is in 800~820 DEG C of ranges；Acceleration cooling is carried out, opening cold temperature is 730
~750 DEG C, final cooling temperature is 200~400 DEG C, and cooling velocity is 25~30 DEG C/s；The pipe line steel is heat-treated.
Preferably, which comprises 800~900 DEG C of quenchings are carried out to the pipe line steel, then carry out 500 DEG C~650 DEG C
Tempering.
Said one or multiple technical solutions in the embodiment of the present invention at least have following one or more technology effects
Fruit:
1, in a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel provided in an embodiment of the present invention, the chemistry of the pipe line steel at
It is the weight percent of 0.20~0.30%, Mn that the weight percent for point including: C, which is the weight percent of 0.07~0.09%, Si,
It is the weight percent of 0.01~0.03%, P than the weight percent for 1.30~1.50%, Alt is the weight of≤0.015%, S
The weight percent that the weight percent that amount percentage is≤0.005%, Nb is 0.015~0.035%, Ti is 0.01~
The weight percent that the weight percent of 0.02%, Cr are 0.20~0.30%, N is≤0.008%, and surplus is Fe and can not keep away
Exempt from impurity element.It solves quenched and tempered state X60Q pipe line steel in the prior art and requires low stubborn ratio, low-temperature flexibility stability hardly possible
Larger technical problem is spent, it is good to have reached quenched and tempered state low yield strength ratio X60Q pipe line steel comprehensive performance provided by the invention, can fit
Pipe-line for some areas such as Africa, the Middle East is built, the technology effect with low yield strength ratio and low-temperature good toughness
Fruit.
2, the preparation method of a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel provided in an embodiment of the present invention, including smelt,
Continuous casting, reheating, rolling, cooling, heat treatment procedure, which comprises steel plate controlled rolling in two stages, first stage open rolling temperature
Degree is 950~1150 DEG C, is then carried out to temperature, to 2~4 times that temperature thickness is finished steel plate thickness, second stage start rolling temperature
It is 860~880 DEG C, finishing temperature control is in 800~820 DEG C of ranges；Acceleration cooling is carried out, opening cold temperature is 730~750 DEG C,
Final cooling temperature is 200~400 DEG C, and cooling velocity is 25~30 DEG C/s；The pipe line steel is heat-treated, solves existing skill
Quenched and tempered state X60Q pipe line steel requires to be difficult to meet more in art, -25 DEG C of pipe line steel of drop impact toughness and the technology of low yield strength ratio
Problem.The good duplex structure of acquisition is reached, and suitable heat treatment process is obtained by combination experiment, there are steel excellent
Good low-temperature flexibility and low yield strength ratio is, it can be achieved that the technical effect that engineering is applied.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
Fig. 1 is a kind of process signal of the preparation method of quenched and tempered state low yield strength ratio X60Q pipe line steel of the embodiment of the present invention
Figure；
Fig. 2 is to roll state metallographic structure figure in the embodiment of the present invention；
Fig. 3 is the quenched and tempered state metallographic structure figure after being heat-treated in the embodiment of the present invention.
Specific embodiment
The embodiment of the invention provides a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation methods, solve existing skill
Quenched and tempered state X60Q pipe line steel requires the low stubborn technical problem more larger than, low-temperature flexibility difficulty in art.
Technical method in the embodiment of the present invention, general thought are as follows: the weight percent of C is 0.07~0.09%, Si
Weight percent be 0.20~0.30%, Mn weight percent be 1.30~1.50%, Alt weight percent be 0.01
The weight percent that the weight percent that the weight percent of~0.03%, P are≤0.015%, S is≤0.005%, Nb is
The weight percent that the weight percent of 0.015~0.035%, Ti are 0.01~0.02%, Cr is 0.20~0.30%, N's
Weight percent is≤0.008%, and surplus is Fe and inevitable impurity element.It is low in the wrong quenched and tempered state provided by the invention has been reached
It is better than X60Q pipe line steel comprehensive performance by force, it is applicable to the pipe-line construction in some areas such as Africa, Middle East, tool
There is the technical effect of low yield strength ratio and low-temperature good toughness.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
The embodiment of the present invention provides a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel, the chemical component packet of the pipe line steel
Include: the weight percent that the weight percent that the weight percent of C is 0.07~0.09%, Si is 0.20~0.30%, Mn is
The weight percent of 1.30~1.50%, Alt are that the weight percent of 0.01~0.03%, P is the weight hundred of≤0.015%, S
Dividing the weight percent that ratio is≤0.005%, Nb is 0.015~0.035%, and the weight percent of Ti is 0.01~0.02%,
The weight percent that the weight percent of Cr is 0.20~0.30%, N is≤0.008%, and surplus is Fe and inevitable impurity
Element.
Specifically, the chemical component of pipe line steel described in the present embodiment include: C weight percent be 0.07~
0.09%, C are one of intensified elements most economical in steel, if C content is too high to cannot ensure desired elongation percentage value, steel
Cold formability, low-temperature flexibility and welding performance also reduce, if carbon content is too low, influence matrix wear-resisting property, thus low C content
Guarantee its low-temperature flexibility；The weight percent of Mn is that 1.30~1.50%, Mn is solution strengthening element, and whens Mn too high levels can shape
At serious banded structure, reduction is laterally extended rate, influences cold formability, therefore, comprehensively consider Fracture of Material, the weight of Mn
Than being designed as 1.30~1.50%；The weight percent of Alt is that 0.01~0.03%, Alt is to play deoxidier in steel-making
Effect, the not clean cold formability that will lead to material of deoxidation can decline, but Alt too high levels will lead to AlN type impurity mistake in steel
It is more, the elongation percentage of material is reduced, the weight percent of Alt is set as 0.01~0.03% by the requirement of the comprehensive pipe line steel；
The weight percent that the weight percent of P is≤0.015%, S is≤0.005%, and the lower impurity element the better in steel, in order to obtain
Good low-temperature flexibility is obtained, the embodiment of the present invention carries out a large number of experiments, and discovery impurity element control is in P :≤0.015%, S :≤
0.005%, it is beneficial to the low-temperature flexibility of product；The weight percent of Nb is that the weight percent of 0.015~0.035%, Ti is
The main function of 0.01~0.02%, Nb and Ti element in the present invention is precipitation strength, improves the strength character of material.This hair
Bright to be proved by a large number of experiments, Nb content controls in 0.015~0.035% range, and Ti content is controlled 0.01~0.020%
Range can achieve preferable precipitating reinforcing effect, obtain good comprehensive performance；The weight percent of Cr be 0.20~
0.30%, Cr element are that effectively, can significantly reduce the yield tensile ratio of material to the tensile strength for improving pipe line steel.A large number of experiments card
Bright, Cr content controls in 0.20~0.30% range, and product yield tensile ratio can significantly reduce；The weight percent of N be≤
0.008%, surplus is Fe and inevitable impurity element.Solve -25 DEG C of pipe line steel of drop impact toughness and low yield strength ratio
Problem, it is good to have reached quenched and tempered state low yield strength ratio X60Q pipe line steel comprehensive performance provided by the invention, is applicable to Africa, the Middle East
Pipe-line etc. some areas is built, with the technical effect that low yield strength ratio and low-temperature flexibility are stable.
Further, the average value of lateral -25 DEG C of ballistic works of the pipe line steel is greater than 405J.
Further, laterally -25 DEG C of sections of shear of dropping hammer are 95%~100% to the pipe line steel, and yield tensile ratio is less than or equal to
0.80, vickers hardness hv 10 is less than or equal to 215.
Further, it is tiny polygonal ferrite and ferrite bainite that the pipe line steel, which rolls the metallographic structure of state steel plate,
Tissue.
Further, the metallographic structure after the pipe line steel is quenched is tempered sorbite tissue or ferrite and tempering Soxhlet
Body tissue.
Specifically, the quenched and tempered state low yield strength ratio X60Q pipe line steel can obtain good duplex structure, the pipeline
The metallographic structure that steel rolls state steel plate is tiny polygonal ferrite and ferrite bainite tissue, and duplex structure, which can reduce, bends by force
Than.Quenched and tempered state metallographic structure is most important to product mechanical property, and quenched and tempered state metallographic structure form of the present invention, composition and size are straight
Connect the low-temperature impact toughness for determining product, strength character and yield tensile ratio size.Metallographic structure after the pipe line steel is quenched is
Tempered sorbite tissue or ferrite and tempered sorbite tissue.Make steel that there is excellent low-temperature flexibility and low yield strength ratio, institute
The average value for stating lateral -25 DEG C of ballistic works of pipe line steel is greater than 405J, and laterally -25 DEG C of sections of shear of dropping hammer are 95% to the pipe line steel
~100%, yield tensile ratio is less than or equal to 0.80, and vickers hardness hv 10 is less than or equal to 215, it can be achieved that engineering application, is suitable for non-
The requirement of the pipe-line construction in some areas such as continent, the Middle East.
Embodiment two
Present embodiments provide a kind of preparation method of quenched and tempered state low yield strength ratio X60Q pipe line steel, including smelting, continuous casting, again
Heating, rolling, cooling, heat treatment procedure, which comprises
Step 10: steel plate controlled rolling in two stages, first stage start rolling temperature are 950~1150 DEG C, are then carried out to temperature, to
Temperature thickness is 2~4 times of finished steel plate thickness, and second stage start rolling temperature is 860~880 DEG C, finishing temperature control 800~
820 DEG C of ranges；
Specifically, first stage start rolling temperature is 950~1150 DEG C, then carries out to temperature, be finished steel to temperature thickness
2-4 times of plate thickness, second stage start rolling temperature are 860~880 DEG C, and finishing temperature control is in 800~820 DEG C of ranges, two ranks
The technological parameter of section rolling can guarantee that product fine microstructures with uniformly, have vital effect to subsequent low-temperature flexibility.
Step 20: carrying out acceleration cooling, opening cold temperature is 730~750 DEG C, and final cooling temperature is 200~400 DEG C, cooling speed
Degree is 25~30 DEG C/s；
Specifically, carry out acceleration cooling after hot-rolled steel plate, opening cold temperature is 730~750 DEG C, final cooling temperature is 200~
400 DEG C, cooling velocity is 25~30 DEG C/s.F+B tissue is obtained under cold and final cooling temperature in lower open, and main cause is:
It is lower to open cold temperature and enter ferrite transformation area after rolling in Cooling Process, generate pro-eutectoid ferrite, lower end cold temperature
Degree, obtains hard phase bainite structure, duplex structure can reduce yield tensile ratio.
Step 30: the pipe line steel is heat-treated.
Further, which comprises 800~900 DEG C of quenchings are carried out to the pipe line steel, then carry out 500 DEG C~650
DEG C tempering.
Specifically, be heat-treated to the pipe line steel, heat treatment process be carry out 800 to the pipe line steel~
900 DEG C of quenchings, then carry out 500 DEG C~650 DEG C tempering.Wherein it should be understood that the quenching is that steel is heated to critical-temperature or more,
Then held for some time is cooled down with being greater than critical cooling rate, to obtain the unbalance microstructure based on martensite
A kind of heat-treatment technology method of (also with good grounds to need to obtain bainite or keep single phase austenite).Quenching is steel heat treatment work
The work post process being most widely used in skill, it is most common to have water hardening, oil quenchinng, dry quenching etc., steel heat
Processing substantially has four kinds of annealing, normalizing, quenching and tempering basic technologies.Tempering is the brittleness in order to reduce steel part, after quenching
Steel part kept the temperature for a long time lower than 710 DEG C of a certain proper temperature being higher than room temperature, then cooled down, this technique
Referred to as it is tempered.
Light plate preparation process obtains good duplex structure through the embodiment of the present invention, and is closed by combination experiment
Suitable heat treatment process solves the problems, such as -25 DEG C of pipe line steel of drop impact toughness and low yield strength ratio, of the present invention quenched
State low yield strength ratio X60Q pipeline steel mechanical property are as follows: (1) average value of lateral -25 DEG C of ballistic works of steel plate is greater than 405J；(2) steel plate
Laterally -25 DEG C of sections of shear of dropping hammer are 95%~100%；(3) yield tensile ratio≤0.80；(4) vickers hardness hv 10≤215.Reach
Quenched and tempered state low yield strength ratio X60Q pipe line steel comprehensive performance provided by the invention is good, is applicable to Africa, Middle East etc. somely
The pipe-line in area is built, with the technical effect that low yield strength ratio and low-temperature flexibility are stable.
Embodiment three
A kind of quenched and tempered state low yield strength ratio X60Q pipe line steel and preparation method of the embodiment of the present invention, the smelting in 100 tons of converters
Refining, carries out controlled rolling and controlled cooling on 4300mm production line, then carries out quenching and tempering heat treatment process, below by embodiment to this
Invention is further described.Embodiment light plate chemical component is shown in Table 1, embodiment quenched and tempered state low yield strength ratio X60Q pipeline steel
Preparation Method process system is shown in Table 2, and the mechanical property of embodiment quenched and tempered state low yield strength ratio X60Q pipe line steel is shown in Table 3:
The quenched and tempered state low yield strength ratio X60Q pipe line steel embodiment chemical component (wt%) of the present invention of table 1.
| Embodiment | C | Si | Mn | P | S | Alt | N | Nb | Ti | Cr |
| 1 | 0.077 | 0.25 | 1.36 | 0.009 | 0.003 | 0.020 | 0.0011 | 0.026 | 0.018 | 0.27 |
| 2 | 0.087 | 0.20 | 1.41 | 0.007 | 0.002 | 0.023 | 0.003 | 0.017 | 0.012 | 0.23 |
| 3 | 0.079 | 0.23 | 1.33 | 0.010 | 0.002 | 0.021 | 0.002 | 0.028 | 0.010 | 0.28 |
| 4 | 0.085 | 0.30 | 1.47 | 0.008 | 0.003 | 0.020 | 0.0018 | 0.032 | 0.016 | 0.25 |
| 5 | 0.083 | 0.26 | 1.39 | 0.010 | 0.002 | 0.026 | 0.0027 | 0.025 | 0.019 | 0.21 |
The quenched and tempered state low yield strength ratio X60Q pipe line steel embodiment process system of the present invention of table 2.
It is tiny polygonal ferrite that quenched and tempered state low yield strength ratio X60Q pipe line steel produced by the invention, which rolls state metallographic structure,
With ferrite bainite duplex structure, it is quenched after metallographic structure be tempered sorbite tissue or ferrite and tempered sorbite group
It knits；Many experimental results of the present invention show that quenched and tempered state metallographic structure is most important to product mechanical property, quenched and tempered state gold of the present invention
Phase constitution form, composition and size directly determine low-temperature impact toughness, strength character and the yield tensile ratio size of product.
Quenched and tempered state metallographic structure photo after rolling state metallographic structure photo and Fig. 2 heat treatment referring to attached drawing 1, embodiment mechanics
Performance is as shown in table 3.
3. embodiment quenched and tempered state low yield strength ratio X60Q pipeline steel mechanical property of table
The present invention obtains good metallographic structure, makes steel by control steel plate chemical component and rolling, heat treatment process
With excellent low-temperature flexibility and low yield strength ratio, it can be achieved that engineering application.
The technical solution provided in the embodiment of the present application, has at least the following technical effects or advantages:
1, in a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel provided in an embodiment of the present invention, the chemistry of the pipe line steel at
It is the weight percent of 0.20~0.30%, Mn that the weight percent for point including: C, which is the weight percent of 0.07~0.09%, Si,
It is the weight percent of 0.01~0.03%, P than the weight percent for 1.30~1.50%, Alt is the weight of≤0.015%, S
The weight percent that the weight percent that amount percentage is≤0.005%, Nb is 0.015~0.035%, Ti is 0.01~
The weight percent that the weight percent of 0.02%, Cr are 0.20~0.30%, N is≤0.008%, and surplus is Fe and can not keep away
Exempt from impurity element.It solves quenched and tempered state X60Q pipe line steel in the prior art and requires low stubborn ratio, low-temperature flexibility stability hardly possible
Spend larger technical problem.It is good to have reached quenched and tempered state low yield strength ratio X60Q pipe line steel comprehensive performance provided by the invention, can fit
Pipe-line for some areas such as Africa, the Middle East is built, the technology effect with low yield strength ratio and low-temperature good toughness
Fruit.
2, the preparation method of a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel provided in an embodiment of the present invention, including smelt,
Continuous casting, reheating, rolling, cooling, heat treatment procedure, which comprises steel plate controlled rolling in two stages, first stage open rolling temperature
Degree is 950~1150 DEG C, is then carried out to temperature, to 2~4 times that temperature thickness is finished steel plate thickness, second stage start rolling temperature
It is 860~880 DEG C, finishing temperature control is in 800~820 DEG C of ranges；Acceleration cooling is carried out, opening cold temperature is 730~750 DEG C,
Final cooling temperature is 200~400 DEG C, and cooling velocity is 25~30 DEG C/s；The pipe line steel is heat-treated.Solves existing skill
Quenched and tempered state X60Q pipe line steel requires to be difficult to meet more in art, -25 DEG C of pipe line steel of drop impact toughness and the technology of low yield strength ratio
Problem.The good duplex structure of acquisition is reached, and suitable heat treatment process is obtained by combination experiment, there are steel excellent
Good low-temperature flexibility and low yield strength ratio is, it can be achieved that the technical effect that engineering is applied.
3, the embodiment of the present application is tempered sorbite tissue or ferrite by metallographic structure of the pipe line steel after quenched
With tempered sorbite tissue.Solve quenched and tempered state X60Q pipe line steel in the prior art meet have it is low stubborn more steady than, low-temperature flexibility
The larger technical problem of the realization difficulty of provisioning request, having reached quenched and tempered state metallographic structure form, composition and size of the present invention makes to obtain
The technical effect that there are the product obtained the indexs such as low-temperature impact toughness, strength character and yield tensile ratio to meet engineering demand.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of quenched and tempered state low yield strength ratio X60Q pipe line steel, it is characterised in that: the chemical component of the pipe line steel includes: the weight of C
The weight percent that the weight percent that amount percentage is 0.07~0.09%, Si is 0.20~0.30%, Mn is 1.30~
The weight percent that the weight percent that the weight percent of 1.50%, Alt are 0.01~0.03%, P is≤0.015%, S is
The weight percent of≤0.005%, Nb are that the weight percent of 0.015~0.035%, Ti is the weight of 0.01~0.02%, Cr
Measuring the weight percent that percentage is 0.20~0.30%, N is≤0.008%, and surplus is Fe and inevitable impurity element.
2. pipe line steel as described in claim 1, which is characterized in that the average value of lateral -25 DEG C of ballistic works of the pipe line steel is big
In 405J.
3. pipe line steel as described in claim 1, which is characterized in that laterally -25 DEG C of sections of shear of dropping hammer are the pipe line steel
95%~100%, yield tensile ratio is less than or equal to 0.80, and vickers hardness hv 10 is less than or equal to 215.
4. pipe line steel as described in claim 1, which is characterized in that the metallographic structure that the pipe line steel rolls state steel plate is polygon
Ferrite and ferrite bainite tissue.
5. pipe line steel as described in claim 1, which is characterized in that the metallographic structure after the pipe line steel is quenched is tempering Soxhlet
Body tissue or ferrite and tempered sorbite tissue.
6. a kind of preparation method of quenched and tempered state low yield strength ratio X60Q pipe line steel, including smelting, continuous casting, reheating, rolling, cooling,
Heat treatment procedure, which is characterized in that
The rolling process carries out in two stages, and first stage start rolling temperature is 950~1150 DEG C, then carries out to temperature, to temperature
With a thickness of 2~4 times of finished steel plate thickness, second stage start rolling temperature is 860~880 DEG C, finishing temperature control 800~
820℃；
The cold temperature of opening of the cooling process is 730~750 DEG C, and final cooling temperature is 200~400 DEG C, and cooling velocity is 25~30
℃/s。
7. method as claimed in claim 6, which is characterized in that the heat treatment procedure includes:
800~900 DEG C of quenchings are carried out to the pipe line steel, then carry out 500 DEG C~650 DEG C tempering, to be carried out to the pipe line steel
Heat treatment.
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| EP1918400A1 (en) * | 2005-08-22 | 2008-05-07 | Sumitomo Metal Industries, Ltd. | Seamless steel pipe for line pipe and method for producing same |
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| CN104805367A (en) * | 2015-04-07 | 2015-07-29 | 首钢总公司 | X65 pipeline steel plate with favorable erosion and abrasion resistance and preparation method thereof |
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| EP1918400A1 (en) * | 2005-08-22 | 2008-05-07 | Sumitomo Metal Industries, Ltd. | Seamless steel pipe for line pipe and method for producing same |
| CN102534377A (en) * | 2012-02-29 | 2012-07-04 | 首钢总公司 | X70-degree large deformation resisting pipeline steel plate with excellent tenacity and preparation method for pipeline steel plate |
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