CN110331332A - It is a kind of to produce the super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method with DQ substitution hardening and tempering process - Google Patents
It is a kind of to produce the super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method with DQ substitution hardening and tempering process Download PDFInfo
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
It is by mass percentage C0.04-0.06 the present invention relates to the super thick pipe part steel plate used under a kind of substitution hardening and tempering process production condition of ultralow temperature with DQ and its manufacturing method, the chemical component of the steel plate；Si0.20-0.40；Mn1.5-1.7；Al0.02-0.04；Nb0.04-0.06；V0.03-0.06；Cr0.1-0.3；Ni0.1-0.3；Mo0.2-0.3；Cu0.1-0.3；Ti0.01-0.02；Pcm≤0.20；Surplus is Fe and inevitable impurity.Manufacturing method includes the processes such as the KR molten iron pretreatment successively carried out, converter smelting, the refining of LF and RH furnace, sheet billet continuous casting, heating of plate blank, rolling, DQ+ACC cooling, hardening and tempering process is substituted with the online DQ of low cost, 30-70mm super thick pipe part steel plate ballistic work >=220J requirement under the conditions of -80 DEG C can be met.
Description
Technical field
The invention belongs to metallurgical technology field, it is related to using under a kind of substitution hardening and tempering process production condition of ultralow temperature with DQ
Super thick pipe part steel plate and its manufacturing method.
Background technique
Recent years, the construction of China's oil natural gas rapidly develop, and have driven greatly improving for pipeline output of steel, simultaneously
Also the rapid development of steel for pipe fittings, such as pressurization, transmission & distribution gas, pigging station and yard has been driven to require a large amount of steel for pipe fittings,
The steel for pipe fittings for more especially thering is particular surroundings to require, such as in some high of the ground such as the Russia of Xinjiang, northeast and foreign countries
Cold area, the limiting temperature of ambient enviroment need to have more on the basis of conventional pipe steel between -30 DEG C to -65 DEG C
The performances such as good cryogenic property, high tenacity, easy welding.Meanwhile such pipe fitting is in entire manufacturing process, the process costs of material
Also critically important, hardening and tempering process is substituted using DQ press quenching, production cost can greatly be reduced.Therefore, a kind of to be replaced with DQ
The super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method are produced for hardening and tempering process, can satisfy requirement of engineering,
The safety that extremely frigid zones Oil and gas station pipe fitting is on active service is improved, easy welding performance is improved, reduces cost.
Pipe fitting generally uses quenched and tempered state delivery after quenching+tempering, is just able to satisfy the performance requirement of steel for pipe fittings.Tradition
Steel for pipe fittings generallys use medium high carbon+raising harden ability design of alloy, as patent announcement CN 108315649 is proposed
A kind of continuous casting billet produces big wall thickness ultralow temperature pipe fitting steel plate and preparation method thereof, 40~62mm under the conditions of can meeting -60 DEG C
The use of thickness steel for pipe fittings, is not available more than -60 DEG C, and the range of C is not belonging to easy weldability 0.06~0.09%
Steel is obviously deteriorated in terms of the solderability of material；Patent CN 102011064 proposes a kind of X80 grade low-temp steel for pipe fittings and its system
Standby and application, can meet and use under -46 DEG C of cryogenic conditions, the range of C in 0.12-0.16%, such steel in limiting temperature is more than -
It is not available at 46 DEG C, and such steel welding performance is poor.
Summary of the invention
It is a kind of raw with DQ substitution hardening and tempering process the technical problem to be solved by the present invention is to be provided for the above-mentioned prior art
The super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method are produced, on the one hand saves subsequent heat treatment cost, simultaneously
Pipe fitting can be met to use under -80 DEG C of cryogenic conditions.
The present invention solves the above problems used technical solution are as follows: a kind of to produce ultralow temperature item with DQ substitution hardening and tempering process
The super thick pipe part steel plate used under part, the steel plate are basic element with Fe, and include following chemical component (quality percentage
Than): C 0.04-0.06；Si 0.20-0.40；Mn 1.5-1.7；Al 0.02-0.04；Nb 0.04-0.06；V 0.03-
0.06；Cr 0.1-0.3；Ni 0.1-0.3；Mo 0.2-0.3；Cu 0.1-0.3；Ti 0.01-0.02；Pcm=C+Si/30+
(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B≤0.20。
The yield strength of the steel plate be >=540MPa, tensile strength be >=620MPa, -80 DEG C of Charpy-V impact powers >=
220J。
This invention takes the design of the ingredient of the microalloy elements such as low-carbon+(Nb, V, Ti, Cr, Mo, Ni, Cu), C≤
0.06%, it can get lower carbon equivalent, excellent ultralow-temperature flexibility, microalloy addition increases online DQ harden ability and refinement
Crystal grain effect.
In addition, the invention patent additionally provides the manufacturing method of above-mentioned steel for pipe fittings, specific production stage are as follows: KR molten iron is pre-
The online DQ+ACC- essence inspection-performance of processing-converter-LF refining-RH vacuum outgas -370-450mm sheet billet continuous casting-slow cooling-rolling -
Detection-storage.
The effect of all components contained in the present invention and its content selection reason are described as follows:
C: carbon is intensified element most economical, most basic in steel, can significantly improve steel by solution strengthening and precipitation strength
Intensity, but toughness to steel and welding performance bring adverse effect, comprehensively consider, C content range of choice of the present invention is
0.04-0.06%.
Si: being added Si in steel, can improve intensity, elastic limit and harden ability, but Si makes in steel with reinforced ferrite
Superheated susceptivity, crackle tendency increase.Comprehensively consider, the range of Si content of the present invention is determined as 0.2-0.4%.
Mn: low-alloy steel grade basic alloy element can expand austenite phase temperature range, improve steel by solution strengthening
Intensity is that the most important element for causing loss of strength because of C content reduction is made up in pipeline steel, and Mn still expands γ simultaneously
The element of phase region can reduce γ → α phase transition temperature of steel, help to obtain tiny phase-change product, and the toughness of steel can be improved, drop
Low tough brittle transition temperature, Mn are also the harden ability element for improving steel.In view of finding Mn segregation to acid-resisting in checkout procedure
Can have an adverse effect, combine intensity requirement, the design of Mn content is in 1.5~1.7% ranges in the present invention.
Al: deoxidant element can play the role of refining crystal grain by forming AlN.The range of choice of Al content of the present invention is
0.02-0.04%.
Mo: having solution strengthening effect, can improve the harden ability of steel, moreover it is possible to and crystal grain is refined, carbide inhomogeneities is improved, from
And improve the intensity and toughness of steel.Mo has significant retardation function to perlitic transformation, and smaller on bainite transformation influence, because
And can get the tissue of a large amount of bainite within the scope of sizable cooling velocity, comprehensively consider, the model of Mo content of the present invention
It encloses and is determined as 0.20~0.30%.
V: carbonitride-forming elements, mainly based on refined crystalline strengthening and precipitation strength, by forming V (C, N) with disperse
Strengthen and the mode of precipitation strength refines crystal grain, improves the intensity and toughness of steel.The range of choice of V content of the present invention is 0.03-
0.06%.
Nb: being one of most important micro alloying element in modern micro alloyed steel especially low-alloy steel, thin to crystal grain
The effect of change is clearly.During normalized treatment, the Nb of solid solution will form NbC and is precipitated in the form of dispersion-strengtherning, can
Intensity is improved without damaging toughness, is comprehensively considered, the range of choice of Nb content of the present invention is 0.04-0.06%.
Cr, Ni, Cu:Cr can improve the inoxidizability and corrosion resistance of steel, and Cr can form fine and close oxidation in steel surface
Film, improves the passivation ability of steel, but reduces low-temperature impact toughness simultaneously；Ni has higher corrosion resistance to soda acid, but compares
It is more rare, price；Cu can improve atmospheric corrosion resistance ability, can improve the corrosion resistance of material, but after addition Cu, steel has
Hot-short tendency, suitable Ni, which is added, can improve the hot-short tendency of the steel containing Cu.Comprehensively consider, the present invention adds using Cr, Ni, Cu are compound
Add, the range of total content is determined as 0.40~0.90%.
Ti: nitrogen killer, 0.02% Ti can fix 60ppm N below in steel, and play analysis by forming TiN
Strengthen the effect with refined crystalline strengthening, effectively refinement crystal grain out.But Ti content is excessively easy to appear coarse precipitated phase, not to toughness
Benefit comprehensively considers, and the range of choice of Ti content of the present invention is 0.01-0.02%.
In ingredient design, the compound adding ingredient design of low-carbon+microalloy, low-carbon of giving prominence to the key points, so that material be made to have are taken
There are good cryogenic property and easy welding performance.
It is a kind of to produce the super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method with DQ substitution hardening and tempering process,
Include following processing step:
(1) steel making working procedure is produced using the pretreatment of KR molten iron, 150t converter smelting, LF refining, RH Fruit storage
Then high-purity molten steel produces special thick continuous casting billet using 370-450mm thickness continuous casting plate billet production technology.Then, to continuous casting billet
Carry out slow cooling, slow cooling time >=48 hour.
(2) continuous casting billet is heated to 1060~1200 DEG C, heat preservation >=30min, continuous casting billet uses high-pressure water descaling after coming out of the stove.
(3) after high-pressure water descaling, two-phase control rolling is carried out, the first stage is rough rolling step, and start rolling temperature is in 1020-
1070 DEG C, cumulative review reduction ratio >=68%, rear three passages single pass is averaged reduction ratio >=20%；Second stage is finish rolling rank
Section, start rolling temperature are 800-860 DEG C, add up percentage pass reduction >=65%；It rolls rear steel plate and carries out DQ press quenching+ACC rapid cooling, it is cold
Speed control is in 15-25 DEG C/s, and 350-450 DEG C of leaving water temperature；It is air-cooled after water outlet.
The present invention substitutes the steel for pipe fittings plate used under quenched and condition of ultralow temperature for use in line DQ, uses low-carbon, micro-
Design of alloy, the smelting of high purity steel, the special thick continuous casting steel billet of 370-450mm thickness take controlled rolling to add as raw material
The cooling method of online DQ+ACC control produces yield strength 540MPa, the ultralow temperature of tension 620MPa or more and easy welded pipe
Part steel plate, the plate property can satisfy the requirement that super thick pipe part is used in -80 DEG C of cryogenic conditions.
Compared with the prior art, the advantages of the present invention are as follows:
1) present invention is using low-carbon, the ingredient design of the compound addition of microalloy, C0.04-0.06%, crack-sensitivity coefficient
The compound addition of Pcm≤0.20 and microalloy, it is ensured that under the premise of armor plate strength, there is excellent easy welding.
2) steel plate provided by the present invention is produced using controlled rolling and online DQ+ACC Controlled cooling process, steel plate metallographic structure
Be mainly low-carbon granular bainite based on (ferrite body be distributed island shape M-A constituent element), this class loading can be mentioned significantly
The intensity and toughness plasticity of high steel plate.Grain size is all >=10 grades, relatively fine, and it is low at -80 DEG C to be able to satisfy 30-70mm super-thick steel plate
Charpy-V impact power >=220J under temperature has good low-temperature impact toughness.
Detailed description of the invention
Fig. 1 is the microstructure picture of 41.8mm thickness steel plate of the present invention；
Fig. 2 is the microstructure picture of 68.7mm thickness steel plate of the present invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment 1-2:
Chemical composition ranges according to the present invention and manufacturing method, through KR molten iron pretreatment-converter smelting-LF refining-
RH vacuum outgas -370-450mm thickness continuous casting billet continuous casting-continuous casting billet slow cooling-continuous casting billet inspection cleaning-slab heating-height
Water de-scaling-rolling-cooling-aligning-warehousing process step is pressed, the ultralow temperature that uses and easy is manufactured under -80 DEG C of cryogenic conditions
Weld-end fittings steel plate.
Above-mentioned heating, rolling, cooling stage specifically comprises the processes of: 370mm thickness continuous casting billet is heated to 1170 DEG C, soaking
Duan Baowen 40min (embodiment 1) or 370mm thickness continuous casting billet are heated to 1190 DEG C, and soaking zone keeps the temperature 50min (embodiment 2), even
Slab uses high-pressure water descaling after coming out of the stove；Then two-phase control rolling is carried out, 1030-1060 DEG C of first stage start rolling temperature adds up
1020-1070 DEG C of comprehensive reduction ratio >=69.7%, workpiece thickness 109mm (embodiment 1) or first stage start rolling temperature, add up
Comprehensive reduction ratio >=68.4%, workpiece thickness 172mm (embodiment 2)；Second stage start rolling temperature is 840 DEG C, adds up passage
Reduction ratio 66.5% (embodiment 1) or 810 DEG C of second stage start rolling temperature add up percentage pass reduction 69.5% (embodiment 2), most
Whole steel plate thickness is 41.8mm (embodiment 1) and 68.7mm (embodiment 2)；Online DQ+ACC rapid cooling, cooling rate are carried out after rolling
21 DEG C/s, 430 DEG C of leaving water temperature (embodiment 1) and 18 DEG C/s of cooling rate, 370 DEG C of leaving water temperature (embodiment 2)；Then thermal straightening,
Steel plate carries out air-cooled after thermal straightening, is put in storage after air-cooled.
The mechanical property of test steel plate is shown in Table 2, and the microscopic structure of steel plate is as depicted in figs. 1 and 2.
The chemical component (wt.%) of pipeline steel in 1 Examples 1 and 2 of table
| Example | C | Si | Mn | P | S | Al | Nb | Ti | V | Cr+Ni+Cu+Mo | Pcm |
| 1 | 0.05 | 0.34 | 1.59 | 0.007 | 0.0010 | 0.035 | 0.053 | 0.015 | 0.005 | 0.87 | 0.192 |
| 2 | 0.06 | 0.35 | 1.67 | 0.008 | 0.0011 | 0.033 | 0.056 | 0.016 | 0.005 | 0.89 | 0.195 |
Wherein: Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B；
The mechanical property of steel for pipe fittings plate in 2 Examples 1 and 2 of table
| Example | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | - 80 DEG C of ballistic work/J |
| 1 | 41.8mm | 574 | 693 | 331,319,270 |
| 2 | 68.7mm | 554 | 679 | 240,248,274 |
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (5)
1. the super thick pipe part steel plate used under a kind of substitution hardening and tempering process production condition of ultralow temperature with DQ, it is characterised in that: institute
Steel plate is stated with Fe as basic element, and includes the chemical component of following mass percent: C 0.04-0.06；Si 0.20-0.40；
Mn 1.5-1.7；Al 0.02-0.04；Nb 0.04-0.06；V 0.03-0.06；Cr 0.1-0.3；Ni 0.1-0.3；Mo
0.2-0.3；Cu 0.1-0.3；Ti 0.01-0.02；Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+
5B≤0.20；The thickness of steel plate reaches 30-70mm.
2. the super thick pipe part used under a kind of substitution hardening and tempering process production condition of ultralow temperature with DQ according to claim 1 is used
Steel plate, it is characterised in that: the yield strength of the steel plate is >=540MPa, and tensile strength is >=620MPa, -80 DEG C of Charpy impacts
Function >=220J；Based on the granular bainite of low-carbon, ferrite body is distributed island shape M-A constituent element, crystal grain for steel plate metallographic structure
>=10 grades of degree.
3. a kind of as described in claim 1 with the super thick pipe part steel used under DQ substitution hardening and tempering process production condition of ultralow temperature
The manufacturing method of plate, it is characterised in that: the method includes following processing step:
Step 1: steel making working procedure, is produced high-purity using the pretreatment of KR molten iron, converter smelting, LF refining, RH Fruit storage
Net molten steel；
Step 2: producing special thick continuous casting billet using 370-450mm thickness continuous casting plate billet production technology；
Step 3: carrying out slow cooling, slow cooling time >=48 hour to continuous casting billet；
Step 4: continuous casting billet is heated to 1060~1200 DEG C, heat preservation >=30min, continuous casting billet uses high-pressure water descaling after coming out of the stove；
Step 5: being rolled after high-pressure water descaling；It rolls rear steel plate and carries out DQ press quenching+ACC rapid cooling, it is air-cooled after water outlet.
4. the super thick pipe part used under a kind of substitution hardening and tempering process production condition of ultralow temperature with DQ according to claim 3 is used
The manufacturing method of steel plate, it is characterised in that: rolling is divided into two stages, and the first stage is rough rolling step, and start rolling temperature is in 1020-
1070 DEG C, cumulative review reduction ratio >=68%, rear three passages single pass is averaged reduction ratio >=20%；Second stage is finish rolling rank
Section, start rolling temperature are 800-860 DEG C, add up percentage pass reduction >=65%.
5. the super thick pipe part used under a kind of substitution hardening and tempering process production condition of ultralow temperature with DQ according to claim 3 is used
The manufacturing method of steel plate, it is characterised in that: cooling rate control is in 15-25 DEG C/s, and 350-450 DEG C of leaving water temperature.
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| CN201910571255.6A CN110331332A (en) | 2019-06-28 | 2019-06-28 | It is a kind of to produce the super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method with DQ substitution hardening and tempering process |
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| CN201910571255.6A CN110331332A (en) | 2019-06-28 | 2019-06-28 | It is a kind of to produce the super thick pipe part steel plate used under condition of ultralow temperature and its manufacturing method with DQ substitution hardening and tempering process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375997A (en) * | 2020-10-10 | 2021-02-19 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803325A (en) * | 2016-04-28 | 2016-07-27 | 江阴兴澄特种钢铁有限公司 | Low-crack-sensitivity and low-yield strength-ratio ultra-thick steel plate and production method thereof |
| CN106567011A (en) * | 2016-11-09 | 2017-04-19 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld ultra-thick steel plate with high strength and high toughness suitable for minus 60 DEG C and manufacturing method thereof |
| CN107641767A (en) * | 2017-08-15 | 2018-01-30 | 河钢股份有限公司邯郸分公司 | A kind of low yield strength ratio Steels for High Rise Buildings Q550GJD and its production method |
| CN109161790A (en) * | 2018-08-22 | 2019-01-08 | 江阴兴澄特种钢铁有限公司 | The high-level high tenacity pipe fitting steel plate and its manufacturing method used under a kind of acid condition |
-
2019
- 2019-06-28 CN CN201910571255.6A patent/CN110331332A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803325A (en) * | 2016-04-28 | 2016-07-27 | 江阴兴澄特种钢铁有限公司 | Low-crack-sensitivity and low-yield strength-ratio ultra-thick steel plate and production method thereof |
| CN106567011A (en) * | 2016-11-09 | 2017-04-19 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld ultra-thick steel plate with high strength and high toughness suitable for minus 60 DEG C and manufacturing method thereof |
| CN107641767A (en) * | 2017-08-15 | 2018-01-30 | 河钢股份有限公司邯郸分公司 | A kind of low yield strength ratio Steels for High Rise Buildings Q550GJD and its production method |
| CN109161790A (en) * | 2018-08-22 | 2019-01-08 | 江阴兴澄特种钢铁有限公司 | The high-level high tenacity pipe fitting steel plate and its manufacturing method used under a kind of acid condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112375997A (en) * | 2020-10-10 | 2021-02-19 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions |
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