CN110373520A - The heat treatment method of steel pipe - Google Patents
The heat treatment method of steel pipe Download PDFInfo
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- CN110373520A CN110373520A CN201910668515.1A CN201910668515A CN110373520A CN 110373520 A CN110373520 A CN 110373520A CN 201910668515 A CN201910668515 A CN 201910668515A CN 110373520 A CN110373520 A CN 110373520A
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- temperature
- steel pipe
- heat treatment
- tempering
- heating
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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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- C21D9/085—Cooling or quenching
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention provides a kind of heat treatment methods of steel pipe.The heat treatment method includes the steps that executing quenching treatment and tempering to steel pipe sequence, the step of quenching treatment includes that the first heating hardening phase of sequence execution, the first heat preservation hardening phase, the second heating hardening phase and the second heat preservation hardening phase, the first heating hardening phase make the temperature of steel pipe by T0It is warming up to T1, keeping the temperature hardening phase makes the temperature of steel pipe in T1At a temperature of keep the temperature 0.5~2h, second heating hardening phase make the temperature of steel pipe by T1It is warming up to T2；And/or the step of tempering includes that the first heating tempering stage of sequence execution, the first heat preservation tempering stage, the second heating tempering stage and the second heat preservation tempering stage, the first heating tempering stage make the temperature of steel pipe by T0' is warming up to T1', heat preservation tempering stage make the temperature of steel pipe in T10.5~3h is kept the temperature at a temperature of ', the second heating tempering stage makes the temperature of steel pipe by T1' is warming up to T2'.
Description
Technical field
The present invention relates to steel pipe manufacturing fields, in particular to a kind of heat treatment method of steel pipe.
Background technique
Process for heat treatment of steel pipe is that steel pipe workpieces are heated to certain temperature heat preservation a period of time, then makes it with certain
Cooling velocity is cooled down.Steel pipe heat treatment is to be heated to undergo phase transition or partial phase change by steel pipe by certain heating curve
Temperature, via the heat treatment method cooled down after heat preservation with certain cooling velocity.The purpose of heat treatment is to improve tissue, mention
The various performances of high steel pipe are to meet the requirement of steel pipe.
Prior heat treatment process parameter includes normalizing or quenching temperature, soaking time, tempering temperature and soaking time
And cooling velocity etc..When prior art design, parameter is general only related with grade of steel and steel grade, and while heating to large capacity heats
The uniformity of temperature considers less.
Larger in the capacity using large-scale car type furnace or batch-type furnace at present, general furnace length is up to 13m or more, width
Can be in 3m or more, highly up to 5m or more, when steel pipe is heat-treated, many steel pipes need multilayer more placements.
However, since the universal length of steel pipe is longer, about 4~12m；Therefore, entire steel pipe will have severe temperature difference,
Thus bring consequence is as follows:
1, steel pipe is deformed because of the stress that the temperature difference generates；
2, the mechanical property difference of same Zhi Gangguan or different steel pipes is larger.
Summary of the invention
The main purpose of the present invention is to provide a kind of heat treatment methods of steel pipe, are existed with solving steel pipe in the prior art
Easily deformation occurs and the poor problem of mechanical property in heat treatment process.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of heat treatment method of steel pipe, including
Quenching treatment is executed to steel pipe sequence and the step of tempering, wherein the step of quenching treatment includes first that sequence executes
Heat up hardening phase, the first heat preservation hardening phase, the second heating hardening phase and the second heat preservation hardening phase, the first heating quenching
Stage makes the temperature of steel pipe by T0It is warming up to T1, keeping the temperature hardening phase makes the temperature of steel pipe in T1At a temperature of keep the temperature 0.5~2h, the
Two heating hardening phases make the temperature of steel pipe by T1It is warming up to T2；And/or the step of tempering includes first liter that sequence executes
Warm tempering stage, the first heat preservation tempering stage, the second heating tempering stage and the second heat preservation tempering stage, the first heating are tempered rank
Section makes the temperature of steel pipe by T0' is warming up to T1', heat preservation tempering stage make the temperature of steel pipe in T10.5~3h is kept the temperature at a temperature of ', the
Two heating tempering stages make the temperature of steel pipe by T1' is warming up to T2'.
Further, the temperature of quenching treatment is 830~1000 DEG C.
Further, the heating rate of the first heating hardening phase is 50~300 DEG C/h.
Further, T2With T1Temperature difference meet 20~80 DEG C.
Further, the time of the second heat preservation hardening phase is 1~2h.
Further, between the quenching treatment the step of and the step of tempering, heat treatment method further includes to steel pipe
The step of carrying out the first cooling treatment.
Further, the temperature of tempering is 430~780 DEG C.
Further, the heating rate of the first heating tempering stage is 30~200 DEG C/h.
Further, T2' and T1The temperature difference of ' meets 30~50 DEG C.
Further, the time of the second heat preservation tempering stage is 1~3h.
Further, after the tempering the step of, heat treatment method further includes carrying out the second cooling treatment to steel pipe
The step of.
Further, by weight percentage, steel pipe includes 0.06~0.55% C, 0.16~0.65% Si, 0.48
The P of~2.72% Mn, 0.17~2.53% Ni, 0.01~0.03% S and 0.01~0.03%, surplus are Fe and micro- conjunction
Gold element.
It applies the technical scheme of the present invention, provides a kind of heat treatment method of steel pipe, the heat treatment method is at quenching
The temperature rise period of reason and/or tempering increases a holding stage, to eliminate because ordinary heat treatment causes whole furnace steel pipe
Temperature difference, enhance steel pipe heating process in temperature uniformity, avoid steel pipe because heat treatment generate performance inconsistency compared with
Big phenomenon improves steel pipe overall length stability.From experimental result as can be seen that the steel pipe obtained using above-mentioned heat treatment
Overall performance is good, and the final steel pipe performance inconsistency range after heat treatment is small, compared with common heat treatment, the steel of this method processing
Pipe performance indicator concentration degree is high, and performance is stablized, yield strength fluctuation range can≤60MPa, steel tube performance qualification rate is up to 99%
More than.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is in a kind of heat treatment method of steel pipe provided by embodiment of the present invention, the temperature of quenching treatment is at any time
Between change curve；
Fig. 2 is in a kind of heat treatment method of steel pipe provided by embodiment of the present invention, the temperature of tempering is at any time
Between change curve.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
As background technique is introduced, easily deformation occurs and mechanical property in heat treatment process for steel pipe in the prior art
The poor problem of energy.In order to solve technical problem as above, present applicant proposes a kind of heat treatment methods of steel pipe, including to steel
Pipe sequence executes quenching treatment and the step of tempering, wherein the step of above-mentioned quenching treatment includes the first of sequence execution
Heat up hardening phase, the first heat preservation hardening phase, the second heating hardening phase and the second heat preservation hardening phase；And/or above-mentioned time
The step of fire processing includes the first heating tempering stage, the first heat preservation tempering stage, the second heating tempering stage that sequence executes
With the second heat preservation tempering stage.
As shown in Figure 1, the first heating hardening phase makes the temperature of steel pipe by T0It is warming up to T1, keeping the temperature hardening phase makes steel pipe
Temperature in T1At a temperature of keep the temperature 0.5~2h, second heating hardening phase make the temperature of steel pipe by T1It is warming up to T2。
As shown in Fig. 2, the first heating tempering stage makes the temperature of steel pipe by T0' is warming up to T1', heat preservation tempering stage make steel
The temperature of pipe is in T10.5~3h is kept the temperature at a temperature of ', the second heating tempering stage makes the temperature of steel pipe by T1' is warming up to T2'.
Above-mentioned heat treatment method increases a holding stage by the temperature rise period in quenching treatment and/or tempering,
To eliminate because ordinary heat treatment causes the temperature difference of whole furnace steel pipe, enhance the temperature uniformity in steel pipe heating process,
The steel pipe phenomenon larger because of the performance inconsistency of heat treatment generation is avoided, steel pipe overall length stability is improved.It is tied from experiment
It is good that fruit can be seen that the steel pipe overall performance obtained using above-mentioned heat treatment, the final steel pipe performance inconsistency model after heat treatment
Enclose small, compared with common heat treatment, the steel tube performance index concentration degree of this method processing is high, and performance is stablized, yield strength fluctuation
Range can≤60MPa, steel tube performance qualification rate is up to 99% or more.
The illustrative embodiments of the heat treatment method of the steel pipe provided according to the present invention are provided.So
And these illustrative embodiments can be implemented by many different forms, and should not be construed to be limited solely to here
The embodiment illustrated.It should be understood that thesing embodiments are provided so that disclosure herein is thorough and complete
It is whole, and the design of these illustrative embodiments is fully conveyed to those of ordinary skill in the art.
In order to improve quenching effect, it is preferable that the temperature of above-mentioned quenching treatment is 830~1000 DEG C；The first heating quenching
The heating rate in stage is 50~300 DEG C/h, more preferably 55~300 DEG C/h, further preferably 50~100 DEG C/h；Second
The time for keeping the temperature hardening phase is 1~2h.In order to improve temperature uniformity, T2With T1Temperature difference meet 20~80 DEG C.
Preferably, in the above-mentioned quenching treatment the step of, steel pipe is layered to separate as required and is put, is fed through in heating furnace
It is heated by the temperature curve of setting.
Between the quenching treatment the step of and the step of tempering, above-mentioned heat treatment method of the invention can also include
The step of carrying out the first cooling treatment to steel pipe, which can be water cooling.
In order to improve tempering effect, it is preferable that the temperature of tempering is 430~780 DEG C；The first heating tempering stage
Heating rate is 30~200 DEG C/h, more preferably 35~200 DEG C/h, further preferably 35~100 DEG C/h；Second keeps the temperature back
The time in fiery stage is 1~3h.In order to improve temperature uniformity, T2' and T1The temperature difference of ' meets 30~50 DEG C.
Preferably, in the above-mentioned tempering the step of, steel pipe is layered to separate as required and is put, is fed through in heating furnace
It is heated by the temperature curve of setting.
After the tempering the step of, above-mentioned heat treatment method of the invention can also include that carry out second to steel pipe cold
But the step of handling, second cooling treatment can be water cooling.
In order to improve steel tube performance, it is preferable that by weight percentage, the steel used in the above-mentioned heat treatment method of the present invention
Pipe includes 0.06~0.55% C, 0.16~0.65% Si, 0.48~2.72% Mn, 0.17~2.53% Ni, 0.01
The P of~0.03% S and 0.01~0.03%, surplus are Fe and microalloy element.
Below in conjunction with specific embodiment, present invention is further described in detail, these embodiments should not be understood as limitation originally
Invent range claimed.
Embodiment 1~19
Present embodiments provide a kind of heat treatment method of steel pipe, by weight percentage, steel pipe include 0.15% C,
0.4% Si, 1.5% Mn, 1.2% Ni, 0.015% S and 0.025% P, surplus be Fe and microalloy element, should
Heat treatment method includes the steps that executing quenching treatment and tempering to steel pipe sequence:
The step of quenching treatment includes the first heating hardening phase, the first the heat preservation hardening phase, second liter that sequence executes
Warm hardening phase and the second heat preservation hardening phase, the first heating hardening phase make the temperature of steel pipe by T0It is warming up to T1, heat preservation quenching
Stage makes the temperature of steel pipe in T1At a temperature of keep the temperature, second heating hardening phase make the temperature of steel pipe by T1It is warming up to T2；
The step of tempering includes the first heating tempering stage, the first the heat preservation tempering stage, second liter that sequence executes
Warm tempering stage and the second heat preservation tempering stage, the first heating tempering stage make the temperature of steel pipe by T0' is warming up to T1', keeps the temperature back
The fiery stage makes the temperature of steel pipe in T1It is kept the temperature at a temperature of ', the second heating tempering stage makes the temperature of steel pipe by T1' is warming up to T2'.
The process conditions being quenched in above-described embodiment 1~10 are as shown in table 1, the process conditions of tempering such as table 2
It is shown；The process conditions being quenched in above-described embodiment 11~19 are respectively as shown in the embodiment 2~10 in table 1, at tempering
The process conditions of reason are as shown in table 2.
Table 1
Table 2
Comparative example 1
This comparative example provides a kind of heat treatment method of steel pipe, using the steel pipe with specification same in embodiment 1~19,
Its heat treatment method includes the steps that executing quenching treatment and tempering to steel pipe sequence:
In the step of quenching treatment, temperature rises to 930 DEG C by room temperature, and heating rate is 100 DEG C/h, and soaking time is
1.5h；
In the step of tempering, temperature rises to 685 DEG C by room temperature, and heating rate is 100 DEG C/h, and soaking time is
1.5h。
The performance of steel pipe through Overheating Treatment in above-described embodiment 1~19 and comparative example 1 is tested, test result is such as
Shown in table 3.
Table 3
The yield strength of a large amount of steel pipes is for statistical analysis in above-described embodiment 1~19 and comparative example 1, and every kind of example is taken out
The numerical value of the yield strength of 100 groups of samples is taken, input MINITAB software is analyzed, above-described embodiment 1~19 and comparative example 1
Process capability index (Cpk) it is as shown in table 4.
Table 4
As can be seen from the above table, compared to comparative example 1 (Cpk=0.98), 1~19 process capability index of embodiment is II grade
(1.67 Cpk >=1.32 >) are able to demonstrate that process guarantees that ability is abundant, and technical management ability is excellent.
Process capability index refers to actual processing of the process in certain time, under state of a control (stable state)
Ability.It is the intrinsic ability of process, or says it is the ability that process guarantees quality.The rating scale of Cpk: it (can mark accordingly
Standard does Corresponding Countermeasures to the process capability index calculated) Cpk >=2.0 is special excellent, it is contemplated that the reduction of cost；2.0 > Cpk >=
1.67 is excellent, should keep it；The 1.67 intuitive ability power of > Cpk >=1.33 are good, in stable condition, but the promotion that should do the best；1.33 > of B grade
Cpk >=1.0 are general, and processing procedure factor, which slightly makes a variation to have, generates undesirable danger；1.0 Cpk >=0.67 > are poor, deficient manufacturing procedure compared with
It is more, it is necessary to promote its ability；0.67 > Cpk is unacceptable, and ability is too poor, is considered as rectifying and improving design process again.
As can be seen from the above description, the above embodiments of the present invention realized the following chievements:
1, heat treatment method increases a holding stage in the temperature rise period of quenching treatment and/or tempering, to eliminate
Because ordinary heat treatment causes the temperature difference of whole furnace steel pipe, enhance the whole temperature uniformity in steel pipe heating process,
Temperature uniformity including branch different in same furnace steel pipe or the different parts with Zhi Gangguan, avoids what steel pipe was generated by heat treatment
The larger phenomenon of performance inconsistency improves steel pipe overall length stability；
2, it is good to can be seen that the steel pipe overall performance obtained using above-mentioned heat treatment from experimental result, after heat treatment
Final steel pipe performance inconsistency range is small, and compared with common heat treatment, the steel tube performance index concentration degree of this method processing is high, performance
Stablize, can accomplish yield strength fluctuation range can≤60MPa, steel tube performance qualification rate is up to 99% or more.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of heat treatment method of steel pipe, which is characterized in that including being executed at quenching treatment and tempering to the steel pipe sequence
The step of reason, wherein
The step of quenching treatment includes the first heating hardening phase, the first the heat preservation hardening phase, second liter that sequence executes
Warm hardening phase and the second heat preservation hardening phase, the first heating hardening phase make the temperature of the steel pipe by T0It is warming up to T1,
The heat preservation hardening phase makes the temperature of the steel pipe in T1At a temperature of keep the temperature 0.5~2h, it is described second heating hardening phase make
The temperature of the steel pipe is by T1It is warming up to T2；And/or
The step of tempering includes the first heating tempering stage, the first the heat preservation tempering stage, second liter that sequence executes
Warm tempering stage and the second heat preservation tempering stage, the first heating tempering stage make the temperature of the steel pipe by T0' is warming up to
T1', the heat preservation tempering stage make the temperature of the steel pipe in T10.5~3h, the second heating tempering rank are kept the temperature at a temperature of '
Section makes the temperature of the steel pipe by T1' is warming up to T2'.
2. heat treatment method according to claim 1, which is characterized in that the temperature of the quenching treatment is 830~1000
℃。
3. heat treatment method according to claim 1 or 2, which is characterized in that the heating of the first heating hardening phase
Speed is 50~300 DEG C/h.
4. heat treatment method according to claim 1 or 2, which is characterized in that the T2With the T1Temperature difference meet 20
~80 DEG C.
5. heat treatment method according to claim 1 or 2, which is characterized in that the time of the second heat preservation hardening phase
For 1~2h.
6. heat treatment method according to claim 1, which is characterized in that the quenching treatment the step of with the tempering
Between the step of processing, the heat treatment method further includes the steps that carrying out the first cooling treatment to the steel pipe.
7. heat treatment method according to claim 1, which is characterized in that the temperature of the tempering is 430~780
℃。
8. heat treatment method according to claim 1 or claim 7, which is characterized in that the heating of the first heating tempering stage
Speed is 30~200 DEG C/h.
9. heat treatment method according to claim 1 or claim 7, which is characterized in that the T2The ' and T1The temperature difference of ' meets
30~50 DEG C.
10. heat treatment method according to claim 1 or claim 7, which is characterized in that the time of the second heat preservation tempering stage
For 1~3h.
11. heat treatment method according to claim 1, which is characterized in that described after the tempering the step of
Heat treatment method further includes the steps that carrying out the second cooling treatment to the steel pipe.
12. heat treatment method according to claim 1, which is characterized in that by weight percentage, the steel pipe includes
0.06~0.55% C, 0.16~0.65% Si, 0.48~2.72% Mn, 0.17~2.53% Ni, 0.01~
The P of 0.03% S and 0.01~0.03%, surplus are Fe and microalloy element.
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| CN201910668515.1A CN110373520A (en) | 2019-07-23 | 2019-07-23 | The heat treatment method of steel pipe |
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2019
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| CN1924066A (en) * | 2005-08-31 | 2007-03-07 | 住友金属工业株式会社 | Steel for pipeline steel tube with excellent hydrogen sulfide breakage resistance |
| DE102007022487B3 (en) * | 2007-05-14 | 2008-10-09 | FWU Kuang Enterprises Co., Ltd., Jen-Te Hsiang | Manufacturing forged steel screws with excellent tensile strength and high ultimate extension, employs specified sequence of heat treatments and deformation |
| CN101748328A (en) * | 2009-12-31 | 2010-06-23 | 首钢总公司 | Ship structure steel plate capable of being welded with high liner energy and method for producing same |
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| CN102605145A (en) * | 2012-04-12 | 2012-07-25 | 王长文 | Steel isothermal quenching-tempering cooling technology |
| CN104313286A (en) * | 2014-09-23 | 2015-01-28 | 沈阳大学 | Heat treatment process for X70 grade pipeline steel bend pipe |
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Application publication date: 20191025 |