CN105132634A - Quenching method of self-elevating ocean platform pile leg rack steel plate - Google Patents
Quenching method of self-elevating ocean platform pile leg rack steel plate Download PDFInfo
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- CN105132634A CN105132634A CN201510599927.6A CN201510599927A CN105132634A CN 105132634 A CN105132634 A CN 105132634A CN 201510599927 A CN201510599927 A CN 201510599927A CN 105132634 A CN105132634 A CN 105132634A
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Abstract
The invention discloses a quenching method of a self-elevating ocean platform pile leg rack steel plate, and belongs to the technical field of steel plate heat treatment. The technical scheme of the invention is that in the first phase of quenching, the heating temperature is AC3+ 50-80 DEG C, the soaking heat preservation is 1.5-2.0 min/mm, and then, the quick cooling quenching is performed; in the second phase of quenching, the steel plate is heated to AC1- 10-20 DEG C again, the temperature is preserved by 0.8-1.2 min/mm, then the temperature rises to AC3+ 100 DEG C with the heating speed not lower than 180 DEG C/h, the temperature is preserved by 0.2-0.3 min/mm for a short period of time, then the temperature is reduced to AC3+ 20-30 DEG C and is preserved by 1.5-1.8 min/mm, and then, the quick quenching is performed. Tissues on the whole thickness section in a large-thickness rack steel plate are uniform, and tend to be consistent; and in particular, the martensite ratio in the 1/2 place of the plate thickness is 90% or higher, so that the excellent tissue foundation for subsequent tempering is laid, and thus the steel plate obtains excellent toughness matching.
Description
Technical field
The present invention relates to a kind of heavy thickness rack steel plate quenching technology of self-elevating ocean platform spud leg, belong to the thermal treatment control technical field of heavy thickness steel plate.
Background technology
Self-elevating ocean platform spud leg tooth bar steel is the critical material of whole platform lifting device, needs the whole weight on carrying platform, therefore requires to have heavy thickness, high strength, high rigidity, high tenacity.General yield strength >=690MPa, tensile strength 790 ~ 930MPa ,-40 DEG C of longitudinal and transverse impacts at thickness of slab 1/2,1/4 place are all greater than 69 Jiao, and Brinell hardness meets more than 260HB.Along with the increase of the working sea area degree of depth, spline thicknesses used also increases thereupon, and most Plate Steel uses specification to reach 210mm.In addition for meeting certain weldability, general carbon equivalent < 0.78%.
Theoretical and production practice all show, along with the increase of heat-treated steel plate thickness, steel plate obdurability coupling becomes more difficult, especially for use in the rack steel plate of self-elevating ocean platform spud leg, not only thickness is thick, also require that the obdurability at thickness of slab 1/2 place mates, this just proposes higher requirement to steel plate homogeneity of structure, gradient structure on whole thickness x cross sectional on controlling simultaneously.Current this steel plate adopts traditional quenching technology easily to produce following problem: (1) this steel plate chemical composition consists of Ni-Cr-Mo steel alloy, easily Structure Inheritance is caused in quenching process, cause steel plate coarse grains, the problem such as uneven microstructure, mixed crystal, general grain fineness number is only 3.5 ~ 5 grades.(2) for ensureing certain weldability, steel plate carbon equivalent is lower, and along with the increase of steel plate thickness, through hardening layer depth is subject to certain restrictions, and thickness of slab 1/2 place is difficult to complete through hardening, and general thickness of slab center ratio of martensite is only 20% ~ 30%, and obdurability is difficult to coupling.Therefore, traditional thermal treatment process can not reach the requirement of plate property, must carry out more effective regulation and control in heat treatment process to the tissue on steel plate thickness cross section, obtains good obdurability to make steel plate, this is long-term open question in current industry, is badly in need of solving.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of quenching technology of self-elevating ocean platform spud leg rack steel plate, this quenching technology can be corresponding according to steel plate different thickness specification chemical composition, adopt different Heating temperatures, make it to meet the demand of steel plate interior tissue and contribute to the improvement of grain refining, to make steel plate different thickness layer tissue evenly tiny, structure property reaches unanimity, and obtains good obdurability coupling requirement.
The technical scheme solved the problems of the technologies described above is:
A quenching method for self-elevating ocean platform spud leg rack steel plate, quenching process adopts two benches quenching technology: first stage quenching temperature is AC3+50 ~ 80 DEG C, soaking insulation 1.5 ~ 2.0min/mm, then quick Cooling Quenching; Steel plate reheats to AC1-10 ~ 20 DEG C by subordinate phase quenching, and insulation 0.8 ~ 1.2min/mm, then rises to AC3+100 DEG C with >=180 DEG C/h heat-up rate, isothermal treatment for short time 0.2 ~ 0.3min/mm, cool the temperature to AC3+20 ~ 30 DEG C more afterwards, insulation 1.5 ~ 1.8min/mm, then fast cold quenching.
The quenching method of above-mentioned self-elevating ocean platform spud leg rack steel plate, described first stage quenching and preserving heat temperature is 910 ~ 930 DEG C.
The quenching method of above-mentioned self-elevating ocean platform spud leg rack steel plate, first carries out tempering before described subordinate phase Quench heating, and tempering temperature is 640 ~ 670 DEG C.
The quenching method of above-mentioned self-elevating ocean platform spud leg rack steel plate, the holding temperature 940 ~ 960 DEG C of described subordinate phase quenching high temperature section, the holding temperature of low-temperature zone is 880 ~ 900 DEG C.
The invention has the beneficial effects as follows:
Present invention employs the novel process of two interrupted hardenings, this quenching technology can be corresponding according to steel plate different thickness specification chemical composition, adopt different Heating temperatures, make the homogeneous microstructure on the inner whole thickness x cross sectional of heavy thickness rack steel plate, reach unanimity, especially thickness of slab 1/2 place ratio of martensite reaches more than 90%, crystal grain obtains refinement, grain fineness number is 7 ~ 7.5 grades, solve uneven microstructure on traditional quenched nickelclad thickness x cross sectional, there is the problems such as mixed crystal in coarse grains, for good organization foundation is established in follow-up tempering, thickness of slab 1/2 place intensity improves more than 50MPa, average impact merit improves more than 80 joules, thus make steel plate obtain good obdurability coupling.
The quenching technology of heavy thickness rack steel plate of the present invention is a kind of innovation to conventional steel plates quenching technology, the structure property of heavy thickness steel plate different thickness layer is reached unanimity, and meet good obdurability coupling requirement, solve the difficult problem do not solved for a long time, for the further developing of thermal treatment process of heavy thickness steel plate provides precedent and experience, significantly improve the economic benefit of enterprise.
Accompanying drawing explanation
Fig. 1 is 177.8mm steel plate quenching process curve figure;
Fig. 2 is 210mm rack steel plate quenching technology graphic representation.
Embodiment
Quenching technology of the present invention comprises two interrupted hardenings:
(1) first stage quenching temperature is AC3+50 ~ 80 DEG C (AC3 is the austenite phase transformation finishing temperature of this steel grade), and traditional quenching temperature is more than AC3 30 ~ 50 DEG C.
By improving first stage quenching temperature, alloy is made to obtain abundant solid solution, homogenizing tissue, rapid cooling quenching is carried out after insulation 1.5 ~ 2.0min/mm, its objective is and obtained lattice distortion and various lattice defect, and the non-equilibrium microstructure containing high density dislocation, for organization foundation is established in subordinate phase quenching.
(2), when heating before subordinate phase quenching, when steel billet temperature rises to AC1-10 ~ 20 DEG C, carry out isothermal treatment for short time, soaking time is 0.8 ~ 1.2min/mm.
Make steel matrix disperse educt part cementite and alloy carbide, its object one is for subordinate phase Quench heating austenitizing provides more forming core particle, improves austenitizing nucleation rate; Two be separate out carbide break original grain position to, block second time Quench heating austenitizing time original position forming core, avoid produce Structure Inheritance.
(3) after DEG C insulation of AC1-10 ~ 20, then AC3+100 DEG C is risen to the heat-up rate of >=180 DEG C, isothermal treatment for short time (soaking time 0.2 ~ 0.3min/mm).
Be rapidly heated and its objective is and all produce spherical austenite in original grain boundary and intracrystalline, there is not crystallography orientation relationship in they and original structure, spherical austenitic generation is by disorganize heredity; The object of AC3+100 DEG C of high superheating temperature improves austenitizing nucleation rate, high Heating temperature also can make grain growth simultaneously, and therefore soaking time is unsuitable long, is 0.2 ~ 0.3min/mm, grain nucleation rate is now greater than coarsening rate, obtains the initial grain of refinement.
(4) after AC3+100 DEG C of isothermal treatment for short time, cool the temperature to AC3+30 ~ 40 DEG C to be incubated, soaking time 1.5 ~ 1.8min/mm.
Object carries out homogenizing in austenitizing cold zone, then carries out quenching rapid cooling.
Below two embodiments of the present invention.
Embodiment 1
Steel grade A517GrQModified, chemical composition C:0.11%, the full aluminium of 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(): 0.045%, surplus is Fe and inevitable impurity.Steel plate thickness is 177.8mm, AC1 is 690 DEG C, and AC3 is 860 DEG C, and heating curve is shown in Fig. 1, and concrete quenching technology is as follows:
1. first stage quenching: steel plate is heated to T1 section 930 DEG C, soaking is incubated 6 hours, then quick Cooling Quenching;
2. the steel plate after being quenched the first stage reheats and is warming up to T2, and temperature is 670 DEG C, is incubated 3 hours, is then warming up to 960 DEG C (i.e. T3) with 180 DEG C/h, isothermal treatment for short time 0.5 hour;
3. be cooled to T4 temperature 900 DEG C, be incubated 5.4 hours, then quick Cooling Quenching.
Heat-treated steel plate thickness is 177.8mm, adopts above-mentioned quenching technology, and steel plate whole thickness x cross sectional homogeneous microstructure is tiny, thickness of slab 1/2nd place ratio of martensite reaches 95%, more traditional quenched martensite ratio improves more than 50%, and grain fineness number is 7.5 grades, than tradition quenching raising more than 2 grades.Steel plate center 1/2 place intensity improves 50MPa, and-40 DEG C of average impact merits improve more than 80 joules, and steel plate obdurability obtains good coupling.
Embodiment 2
Steel grade E690, chemical composition C:0.10%, the full aluminium of 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(): 0.053%, surplus is Fe and inevitable impurity.Steel plate thickness is 210mm, AC1 is 675 DEG C, and AC3 is 850 DEG C, and heating curve is shown in Fig. 2, and concrete quenching technology is as follows:
1. first stage quenching: steel plate is heated to T1 section 920 DEG C, soaking is incubated 7 hours, then quick Cooling Quenching;
2. the steel plate after being quenched the first stage reheats and is warming up to T2, and temperature is 660 DEG C, is incubated 3.5 hours, is then warming up to 950 DEG C (i.e. T3) with 180 DEG C/h, isothermal treatment for short time 0.7 hour;
3. be cooled to T4 temperature 900 DEG C, be incubated 6.3 hours, then quick Cooling Quenching.
Claims (4)
1. a quenching method for self-elevating ocean platform spud leg rack steel plate, is characterized in that: quenching process adopts two benches quenching technology, and first stage quenching temperature is AC3+50 ~ 80 DEG C, soaking insulation 1.5 ~ 2.0min/mm, then quick Cooling Quenching; Steel plate reheats to AC1-10 ~ 20 DEG C by subordinate phase quenching, and insulation 0.8 ~ 1.2min/mm, then rises to AC3+100 DEG C with >=180 DEG C/h heat-up rate, isothermal treatment for short time 0.2 ~ 0.3min/mm, cool the temperature to AC3+20 ~ 30 DEG C more afterwards, insulation 1.5 ~ 1.8min/mm, then fast cold quenching.
2. the quenching method of self-elevating ocean platform spud leg rack steel plate according to claim 1, is characterized in that: described first stage quenching and preserving heat temperature is 910 ~ 930 DEG C.
3. the quenching method of self-elevating ocean platform spud leg rack steel plate according to claim 2, is characterized in that: first carry out tempering before subordinate phase Quench heating, and tempering temperature is 640 ~ 670 DEG C.
4. self-elevating ocean platform spud leg rack steel plate quenching method according to claim 3, is characterized in that: the holding temperature 940 ~ 960 DEG C of subordinate phase quenching high temperature section, the holding temperature of low-temperature zone is 880 ~ 900 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119475A (en) * | 2016-08-30 | 2016-11-16 | 芜湖三联锻造有限公司 | A kind of large-scale high alloy mould special thermal treatment technique |
| 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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| CN101876001A (en) * | 2009-11-25 | 2010-11-03 | 首钢总公司 | Method for improving low-temperature impact toughness of high strength thick steel plate |
| CN102337478A (en) * | 2010-07-15 | 2012-02-01 | 宝山钢铁股份有限公司 | Excellent 100 kg-grade quenched and tempered steel plate with strong toughness and plasticity, and manufacturing method thereof |
| CN102605282A (en) * | 2012-03-22 | 2012-07-25 | 宝山钢铁股份有限公司 | 80Kg grade steel plate with ultrahigh toughness and extreme thickness and manufacturing method of the steel plate |
| CN104711488A (en) * | 2015-02-12 | 2015-06-17 | 舞阳钢铁有限责任公司 | Large-thickness high-strength steel plate for F690 ocean engineering and manufacturing method of steel plate |
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Patent Citations (4)
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| CN101876001A (en) * | 2009-11-25 | 2010-11-03 | 首钢总公司 | Method for improving low-temperature impact toughness of high strength thick steel plate |
| CN102337478A (en) * | 2010-07-15 | 2012-02-01 | 宝山钢铁股份有限公司 | Excellent 100 kg-grade quenched and tempered steel plate with strong toughness and plasticity, and manufacturing method thereof |
| CN102605282A (en) * | 2012-03-22 | 2012-07-25 | 宝山钢铁股份有限公司 | 80Kg grade steel plate with ultrahigh toughness and extreme thickness and manufacturing method of the steel plate |
| CN104711488A (en) * | 2015-02-12 | 2015-06-17 | 舞阳钢铁有限责任公司 | Large-thickness high-strength steel plate for F690 ocean engineering and manufacturing method of steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106119475A (en) * | 2016-08-30 | 2016-11-16 | 芜湖三联锻造有限公司 | A kind of large-scale high alloy mould special thermal treatment technique |
| 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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