CN105132634B - A kind of process for quenching of self-elevating ocean platform spud leg rack steel plate - Google Patents
A kind of process for quenching of self-elevating ocean platform spud leg rack steel plate Download PDFInfo
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- CN105132634B CN105132634B CN201510599927.6A CN201510599927A CN105132634B CN 105132634 B CN105132634 B CN 105132634B CN 201510599927 A CN201510599927 A CN 201510599927A CN 105132634 B CN105132634 B CN 105132634B
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Abstract
A kind of process for quenching for self-elevating ocean platform spud leg rack steel plate, belongs to steel plate technical field of heat treatment.Its technical scheme is：First stage quenching temperature is AC3+50 ~ 80 DEG C, and soaking is incubated 1.5 ~ 2.0min/mm, then quick Cooling Quenching；Steel plate is reheated to 10 ~ 20 DEG C of AC1 by second stage quenching, is incubated 0.8 ~ 1.2min/mm, is then risen to AC3+100 DEG C with >=180 DEG C/h programming rates, 0.2 ~ 0.3min/mm of isothermal treatment for short time, cool the temperature to AC3+20 ~ 30 DEG C again afterwards, be incubated 1.5 ~ 1.8min/mm, then fast cold quenching.Even tissue inside the big thickness rack steel plate of the present invention on whole thickness section, reaches unanimity, and ratio of martensite, up to more than 90%, is that good organization foundation is established in follow-up tempering especially at thickness of slab 1/2, steel plate is obtained good obdurability matching.
Description
Technical field
The present invention relates to a kind of big thickness rack steel plate quenching technical of self-elevating ocean platform spud leg, belong to big thickness steel
The Heat Treatment Control technical field of plate.
Background technology
Self-elevating ocean platform spud leg tooth bar is the critical material of whole platform lifting device with steel, it is necessary on carrying platform
Whole weight, therefore it is required that with big thickness, high intensity, high rigidity, high tenacity.General yield strength >=690MPa, tension
- 40 DEG C of longitudinal and transverse impacts at 790 ~ 930MPa of intensity, thickness of slab 1/2,1/4 are all higher than 69 Jiao, and Brinell hardness meets more than 260HB.
With the increase of working sea area depth, spline thicknesses used are consequently increased, and most steel plate reaches 210mm using specification.It is in addition
Meet certain solderability, general carbon equivalent ＜ 0.78%.
Theoretical and production practices show, with the increase of heat- treated steel plate thickness, and the matching of steel plate obdurability becomes more tired
Difficulty, especially for use in the rack steel plate of self-elevating ocean platform spud leg, not only thickness is thick, while also requiring strong at thickness of slab 1/2
Toughness is matched, and just to steel plate, structural homogenity, gradient structure control to propose higher requirement on whole thickness section for this.Mesh
Preceding this steel plate easily produces problems with using traditional quenching technical：（1）Steel plate chemical composition composition is Ni-Cr-Mo
Structure Inheritance is easily caused in steel alloy, quenching process, the problems such as causing steel plate coarse grains, uneven microstructure, mixed crystal, typically
Grain size is only 3.5 ~ 5 grades.（2）To ensure certain solderability, steel plate carbon equivalent is relatively low, with the increase of steel plate thickness, quenches
Permeable layers depth is subject to certain restrictions, and is difficult complete through hardening at thickness of slab 1/2, and general thickness of slab center ratio of martensite is only 20% ~
30%, obdurability is difficult to match.Therefore, traditional Technology for Heating Processing can not reach the requirement of plate property, it is necessary to heat treated
The tissue on steel plate thickness section is more effectively regulated and controled in journey, so that steel plate obtains good obdurability, this is current row
Long-term open question, is badly in need of solving in the industry.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of quencher of self-elevating ocean platform spud leg rack steel plate
Skill, this quenching technical, using different heating-up temperatures, can be allowed to according to the corresponding chemical composition of steel plate different-thickness specification
Meet the demand of steel plate interior tissue and contribute to the improvement of crystal grain refinement, so that steel plate different-thickness layer tissue is uniformly tiny,
Structure property reaches unanimity, and obtains good obdurability matching and requires.
Solving the technical scheme of above-mentioned technical problem is：
A kind of process for quenching of self-elevating ocean platform spud leg rack steel plate, quenching process uses two benches quenching technical：
First stage quenching temperature is AC3+50 ~ 80 DEG C, and soaking is incubated 1.5 ~ 2.0min/mm, then quick Cooling Quenching；Second
Steel plate is reheated to AC1-10 ~ 20 DEG C by interrupted hardening, is incubated 0.8 ~ 1.2min/mm, is then heated up with >=180 DEG C/h fast
Degree rises to AC3+100 DEG C, 0.2 ~ 0.3min/mm of isothermal treatment for short time, cools the temperature to AC3+20 ~ 30 DEG C again afterwards, and insulation 1.5 ~
1.8min/mm, then fast cold quenching.
The process for quenching of above-mentioned self-elevating ocean platform spud leg rack steel plate, the first stage quenching and preserving heat temperature is
910~930℃。
First carried out before the process for quenching of above-mentioned self-elevating ocean platform spud leg rack steel plate, the second stage Quench heating
Tempering, temperature is 640 ~ 670 DEG C.
The process for quenching of above-mentioned self-elevating ocean platform spud leg rack steel plate, the second stage quenches the insulation of high temperature section
940 ~ 960 DEG C of temperature, the holding temperature of low-temperature zone is 880 ~ 900 DEG C.
The beneficial effects of the invention are as follows：
Present invention employs the new technology of two interrupted hardenings, this quenching technical can be according to steel plate different-thickness specification
Corresponding chemical composition, using different heating-up temperatures, makes the tissue inside big thickness rack steel plate on whole thickness section equal
It is even, reach unanimity, especially ratio of martensite is up to more than 90% at thickness of slab 1/2, and crystal grain is refined, grain size is 7 ~ 7.5 grades,
Solve uneven microstructure, coarse grains on traditional quenched nickelclad thickness x cross sectional there are problems that, be that follow-up tempering is established
Intensity improves more than 50MPa at good organization foundation, thickness of slab 1/2, and average impact work(improves more than 80 joules, so that steel plate
Obtain good obdurability matching.
The quenching technical of the big thickness rack steel plate of the present invention is a kind of innovation to conventional steel plates quenching technical so that big
The structure property of thickness steel plate different-thickness layer reaches unanimity, and meets good obdurability matching requirement, solves long-term
The problem not solved, the further development for the Technology for Heating Processing of big thickness steel plate provides precedent and experience, significantly improves
The economic benefit of enterprise.
Brief description of the drawings
Fig. 1 is 177.8mm steel plate quenching process curve figures；
Fig. 2 is 210mm rack steel plate quenching technical curve maps.
Embodiment
The quenching technical of the present invention includes two interrupted hardenings：
（1）First stage quenching temperature is AC3+50 ~ 80 DEG C（AC3 is ended warm for the austenite phase transformation of the steel grade
Degree）, traditional quenching temperature is 30 ~ 50 DEG C of more than AC3.
By improving first stage quenching temperature, alloy is obtained abundant solid solution, homogenize tissue, insulation 1.5 ~
Rapid cooling quenching is carried out after 2.0min/mm, the purpose is to obtain distortion of lattice and various crystal defects, and contains high density dislocation
Non-equilibrium microstructure, be second stage quenching establish organization foundation.
（2）When being heated before second stage quenching, when steel billet temperature rises to AC1-10 ~ 20 DEG C, isothermal treatment for short time, insulation are carried out
Time is 0.8 ~ 1.2min/mm.
Make a part of cementite of steel matrix disperse educt and alloy carbide, its purpose one is added for second stage quenching
Hot austenitizing provides more equiax crystals, improves austenitizing nucleation rate；Two be that the carbide separated out breaks original grain
Position to, block second of Quench heating austenitizing when forming core in situ, it is to avoid produce Structure Inheritance.
（3）After being incubated in AC1-10 ~ 20 DEG C, AC3+100 DEG C, isothermal treatment for short time are then risen to >=180 DEG C of programming rate
（0.2 ~ 0.3min/mm of soaking time）.
Be rapidly heated the purpose is to original grain boundary and it is transgranular produce spherical austenite, they are not present with original structure
Crystallography orientation relationship, the generation of spherical austenite will destroy Structure Inheritance；The purpose of the AC3+100 DEG C high degree of superheat is to improve difficult to understand
Family name's body nucleation rate, high heating-up temperature can also make crystal grain grow up simultaneously, therefore soaking time is unsuitable long, be 0.2 ~
0.3min/mm, grain nucleation rate now is more than coarsening rate, the initial grain refined.
（4）AC3+30 ~ 40 DEG C are cooled the temperature to after AC3+100 DEG C of isothermal treatment for short time to be incubated, soaking time 1.5 ~
1.8min/mm。
Purpose is homogenized in austenitizing low-temperature space, then carries out quenching rapid cooling.
The following is two embodiments of the present invention.
Embodiment 1
Steel grade A517GrQModified, chemical composition C：0.11%、Si：0.25%、Mn：1.06%、P：0.008%、S：
0.002%、Ni：2.65%、Cr：0.56%、Mo：0.55%、Nb：0.020%、V：0.045%、TAl（Full aluminium）：0.045%, surplus is
Fe and inevitable impurity.Steel plate thickness is 177.8mm, and AC1 is 690 DEG C, and AC3 is 860 DEG C, and heating curves is shown in Fig. 1, specifically
Quenching technical is as follows：
1. the first stage quenches：Steel plate is heated to 930 DEG C of T1 sections, soaking is incubated 6 hours, then quick cooling is quenched
Fire；
2. the steel plate after the first stage is quenched, which is reheated, is warming up to T2, temperature be 670 DEG C, be incubated 3 hours, then with
180 DEG C/h is warming up to 960 DEG C（That is T3）, isothermal treatment for short time 0.5 hour；
3. 900 DEG C of T4 temperature is cooled to, 5.4 hours are incubated, then quick Cooling Quenching.
Heat- treated steel plate thickness is 177.8mm, and using above-mentioned quenching technical, steel plate whole thickness section structure is even and fine
Small, ratio of martensite is up to 95% at thickness of slab 1/2nd, and more traditional quenched martensite ratio improves more than 50%, and grain size is 7.5
Level, more than 2 grades are improved than tradition quenching.Intensity improves 50MPa at steel plate center 1/2, and -40 DEG C of average impact work(improve 80 joules
More than, steel plate obdurability obtains good matching.
Embodiment 2
Steel grade E690, chemical composition C：0.10%、Si：0.27%、Mn：1.03%、P：0.004%、S：0.001%、Ni：
3.35%、Cr：0.73%、Mo：0.71%、Nb：0.015%、V：0.045%、TAl（Full aluminium）：0.053%, surplus is Fe and can not kept away
The impurity exempted from.Steel plate thickness is 210mm, and AC1 is 675 DEG C, and AC3 is 850 DEG C, and heating curves is shown in Fig. 2, and specific quenching technical is such as
Under：
1. the first stage quenches：Steel plate is heated to 920 DEG C of T1 sections, soaking is incubated 7 hours, then quick cooling is quenched
Fire；
2. the steel plate after the first stage is quenched, which is reheated, is warming up to T2, and temperature is 660 DEG C, is incubated 3.5 hours, then
950 DEG C are warming up to 180 DEG C/h（That is T3）, isothermal treatment for short time 0.7 hour；
3. 900 DEG C of T4 temperature is cooled to, 6.3 hours are incubated, then quick Cooling Quenching.
Claims (3)
1. a kind of process for quenching of self-elevating ocean platform spud leg rack steel plate, it is characterised in that：Quenching process uses two benches
Quenching technical, first stage quenching temperature is AC3+50 ~ 80 DEG C, and soaking is incubated 1.5 ~ 2.0min/mm, then quick cooling
Quenching；First it is tempered before second stage Quench heating, steel plate is reheated to temperature, temperature is 640 ~ 670
DEG C, AC3+100 DEG C then is risen to >=180 DEG C/h programming rates, 0.2 ~ 0.3min/mm of isothermal treatment for short time afterwards again drops temperature
To AC3+20 ~ 30 DEG C, 1.5 ~ 1.8min/mm is incubated, then fast cold quenching.
2. the process for quenching of self-elevating ocean platform spud leg rack steel plate according to claim 1, it is characterised in that：It is described
First stage quenching and preserving heat temperature is 910 ~ 930 DEG C.
3. the process for quenching of self-elevating ocean platform spud leg rack steel plate according to claim 2, it is characterised in that：Second
940 ~ 960 DEG C of the holding temperature of interrupted hardening high temperature section, the holding temperature of low-temperature zone is 880 ~ 900 DEG C.
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| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN109338067A (en) * | 2018-11-01 | 2019-02-15 | 河钢股份有限公司 | The quenching technical of 1000MPa grades of low carbon high-strength steel plates |
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