CN108728743A - The good Marine Engineering Steel of low temperature fracture toughness and its manufacturing method - Google Patents
The good Marine Engineering Steel of low temperature fracture toughness and its manufacturing method Download PDFInfo
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- CN108728743A CN108728743A CN201810594861.5A CN201810594861A CN108728743A CN 108728743 A CN108728743 A CN 108728743A CN 201810594861 A CN201810594861 A CN 201810594861A CN 108728743 A CN108728743 A CN 108728743A
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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
- 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
-
- 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
- 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
- C22C38/40—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
- C22C38/46—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
Abstract
The present invention discloses the good Marine Engineering Steel of low temperature fracture toughness and its manufacturing method.Contain C in steel：0.05%~0.10%, Si：0.2%~0.5%, Mn：1.0%~1.5%, Cu：0.20%~0.50%, Cr：1.00%~1.50%, Ni：1.6%~1.8%, P≤0.01%, S≤0.01%, Als：0.01%~0.05%, Nb：0.02%~0.04%, Ti：0.01%~0.02%, V：0.05%~0.07%, remaining is Fe and inevitable impurity.It is rolled using two stage controls, first stage rolling temperature is 950~1050 DEG C, single pass reduction ratio >=15%；Second stage rolling temperature is 840~880 DEG C, and single pass reduction ratio is more than 10%；Average cooling rate 3 DEG C/s of >, red temperature are 500~600 DEG C；Heat treatment is using quenching+tempering mode, yield strength >=620MPa of steel plate, 60~100mm of thickness, low temperature fracture toughness are good twice.
Description
Technical field
The invention belongs to steel material preparation fields, especially have high intensity, think gauge, superior low-temperature toughness and fracture tough
The steel plate and its manufacturing method of property.
Background technology
As offshore oil, natural gas resource exploitation are growing, ocean engineering is continuously increased with the demand of equipment material,
It is required that also increasingly improving.Offshore platform steel plate must be wanted with the stringent of high intensity, high tenacity, good welds and think gauge
It asks, especially the fracture toughness performance of material is extremely paid attention to.
High intensity, the manufacturing process of think gauge offshore platform steel generally use hardening and tempering process, and how to use quenched work
The steel plate for ocean engineering that skill produces think gauge, high intensity, excellent low temperature toughness and fracture toughness be study at present it is important
Direction.
The patent of invention of Publication No. CN104726773B proposes a kind of high with good -50 DEG C of low-temperature flexibilities normalizing type
Intensity steel plate of pressure vessel and its manufacturing method, patent composition design are as follows：C：0.10%~0.22%；Si≤0.40%；
Mn：1.10%~1.74%；P≤0.015%；S≤0.010%；Ni≤0.40%；V≤0.18%；N：0.0070%~
0.0190%；Als：0~0.025% and Ti：0~0.018%；Surplus is Fe and is inevitably mingled with.This patent is used
Ingredient and the armor plate strength that obtains of preparation process it is relatively low, low-temperature flexibility is insufficient, is not carried out good fracture toughness, and this is specially
The steel plate thickness that profit is realized cannot be satisfied ocean engineering super-thick steel plate requirement.
A kind of offshore platform steel plate of patent of invention proposition and its manufacturing method of Publication No. CN103436784B, this is specially
Sharp composition design is as follows：C：0.10%~0.15%；Si：0.20%~0.50%；Mn：1.30%~1.60%；P≤
0.015%；S≤0.005%；Als：0.015%~0.055%；Nb：0.030%~0.060%；V：0.040%~
0.080%；Ti：0.008%~0.020%；Ni：0.20%~0.40%；Surplus is Fe and is inevitably mingled with.This patent
The armor plate strength that chemical composition and manufacturing process are realized is relatively low, and low-temperature flexibility is insufficient, is not carried out good fracture toughness.
Invention content
It is an object of the invention to propose a kind of ocean with high intensity, superior low-temperature fracture toughness and big thickness
Engineering steel plate and its manufacturing method, purpose, the present inventors screen clean with proportioning, steel from alloying element to realize the present invention
Several aspects such as cleanliness control, process optimization and parameter selection, microstructure control have carried out a large amount of and system experimental study,
Final determine can meet the object of the invention alloying element with when preparation process.
Specifically technical solution is：
Marine Engineering Steel with good low temperature fracture toughness, by weight percentage, including following component C：
0.05%~0.10%, Si：0.2%~0.5%, Mn：1.0%~1.5%, Cu：0.20%~0.50%, Cr：1.00%~
1.50%, Ni：1.6%~1.8%, P≤0.01%, S≤0.01%, Als：0.010%~0.050%, Nb：0.020%~
0.040%, Ti：0.010%~0.020%, V：0.050%~0.070%, remaining is Fe and inevitable impurity.
The mechanism of action of each alloying component is as follows in steel of the present invention：
C：It is the essential elements of proof strength, has apparent work to the intensity for improving steel by solution strengthening and precipitation strength
With, but ductility, toughness of the excessively high C content to steel, especially weldability have negative effect.From economy and properties of product angle
Degree considers that the present invention controls C content 0.05%~0.10%.
Si：It is main deoxidation ingredient in steelmaking process, sufficient deoxidation effect must contain 0.10% or more in order to obtain,
But the toughness that base material and welding position can be reduced if being more than the upper limit, with Si existing for solution while improving intensity
Ductile-brittle transition temperature can be improved, therefore the control of Si contents is 0.2%~0.5% by the present invention.
Mn：It is the essential elements of the intensity and toughness that ensure steel.In order to improve the obdurability of material of the present invention, therefore this hair
Bright control Mn content ranges is 1.0%~1.5%.
Cu：Cu is added in steel, corrosion resistance, the intensity of steel can be improved, improves weldability, mouldability and machinability
Deng.It is used simultaneously with Ni, red brittleness can also be avoided.Therefore, the control of Cu contents is 0.20%~0.50% by the present invention.
Ni：With solution strengthening effect, steel alloy can be promoted to form stable austenite tissue, the intensity of steel can be improved, it is special
It is not low-temperature flexibility, and improves Cu caused red brittleness in steel, therefore Ni contents of the present invention control is 1.6%~1.8%.
Cr：The important element for improving the quenching degree of steel, for thick-standard ship plate and Marine Engineering Steel, addition is appropriate
Cr contents can effectively improve quenching degree to make up the loss of strength of gauge strips, improve the uniformity of performance on thickness direction；
But too high chromium and manganese is added in steel simultaneously, and low melting point Cr-Mn composite oxides can be caused to be formed, formed in hot procedure
Face crack, while can severe exacerbation welding performance.Therefore the Cr contents control in the present invention is 1.00%~1.50%.
P：It is the element for bringing adverse effect to impact value, can be segregated in slab centre and in crystal boundary aggregation etc.
Low-temperature flexibility is damaged, the present invention controls P content not higher than 0.01%.
S：It is the element for bringing adverse effect to impact value, sulphide inculsion can be formed, become formation of crack, the present invention will
S contents are controlled not higher than 0.01%.
Als：The deoxidation that must be added as the present invention and crystal grain thinning element, addition content surpass 0.01% or more
Strand fire check is easy tod produce when 0.08%, while the toughness of steel reduces.Therefore, the present invention controls Als contents
0.01%~0.05%.
Nb：The effectively crystallite dimension of refinement steel, the element added as the intensity and toughness that improve steel.When Nb contents are small
It is small to the performance function and effect of steel when 0.01%, and when more than 0.05%, the welding performance and toughness of steel reduce, therefore this
Invention controls Nb contents 0.02%~0.04%.
Ti：The ingredient added as the toughness and welding position toughness that improve steel exists in the form of TiN and plays and make
With but easily forming bulky grain TiN when more than 0.04% and lose effect, therefore the present invention will add the control of Ti content ranges and be
0.01%~0.02%.
V：It can play the role of solution strengthening in steel, the precipitation when lower temperature rolls can hinder the movement of dislocation,
Make have a large amount of dislocation in austenite, promote phase deformed nucleus, refine final tissue, but toughness that excess V can be to steel plate and welding
Have an adverse effect, therefore the present invention adds ranging from the 0.05%~0.07% of V content.
A kind of preparation process route of the Marine Engineering Steel with good low temperature fracture toughness is：Smelting-strand adds
Heat-rolling-cooling-Tempering and Quenching.Specifically include following steps：
(1) smelting process：Composition range according to the invention is smelted, and is smelted, is obtained continuous casting billet, LF and RH after continuous casting
Refining furnace handles 10~30min of each needs, middle packet molten steel overheat≤25 DEG C, whole process protection casting；A, B, C, D class are mingled in steel
Object meets：The requirement of A≤1.0, B≤1.0, C≤1.0, D≤1.0.Continuous casting billet formative stage uses dynamic soft reduction technology, has
Effect solves the segregation situation of continuous casting billet.
(2) heating process：To prevent steel billet overheat, original austenite grains in heating process coarse, heating and temperature control
At 1150~1200 DEG C, at 1150~1180 DEG C, soaking time is 30~60min for soaking temperature control；
(3) rolling mill practice：Two stage control rollings are carried out to continuous casting billet, the first stage rolls for recrystallization zone, rolling
Temperature controlling range be 950~1050 DEG C, the operation of rolling using at a slow speed, heavy reduction rolling, single pass reduction ratio 15% with
On, the purpose is to make the austenite recrystallization of steel plate 1/4 and 1/2 thickness position by the deformation of single track heavy reduction, fully refine
Austenite grain；Second stage rolls for Unhydrated cement, and rolling temperature is in Ar3 or more, ranging from 840~880 DEG C, using list
Percentage pass reduction is more than 10%, it is therefore an objective to make austenite grain fully deformed, provide energy storage and position for phase deformed nucleus, improve phase
Deformed nucleus rate.
(4) cooling technique：It is more than the rapid laminar cooling system of 3 DEG C/s using average cooling rate, red temperature is controlled 500
~600 DEG C, phase-change organization is constituted and size, steel plate will carry out slow cooling the purpose is to controlling, and temperature retention time >=for 24 hours.
(5) heat treatment process：Using quenching-and-tempering process, including：Primary quenching temperature is 910~940 DEG C, when heat preservation
Between coefficient：1.0~1.2min/mm, the type of cooling use water cooling；Secondary quenching temperature is 900~930 DEG C, soaking time coefficient：
1.0~1.2min/mm, the type of cooling use water cooling；Temperature is 580~620 DEG C, soaking time coefficient：2.0~
2.5min/mm, the type of cooling is using air-cooled；
The steel plate finished product thickness ranging from 60~100mm, manufacturing method is using controlled rolling, the cooling and quenched heat of control
Processing, in a thickness direction yield strength >=620MPa at 1/4 and 1/2,720~890MPa of tensile strength, -80 DEG C of Charpy punchings
Work(>=200J is hit, zero ductility transition temperature (NDTT) is less than -60 DEG C.Microscopic structure is tempered sorbite, wherein containing has
It is distributed the reversed austenite of Dispersed precipitate, 10~20 μm of crystallite dimension.
Advantageous effect：
The present invention compared with the existing technology, has the beneficial effect that：
(1) present invention is conducive to improve low temperature fracture toughness, control by adding appropriate Cu, Cr, Ni and microalloy element
Sulphur phosphorus content is conducive to promote inside steel billet quality, using controlled rolling and control cooling means and quenching-and-tempering process
The microscopic structure and crystallite dimension of steel plate thickness direction are controlled, especially circulating quenching+tempering process can increase substantially steel
Plate low temperature fracture toughness, 1/4 He of steel plate thickness direction different location can be improved by being combined by chemical composition and preparation process
Low-temperature impact work, intensity and the fracture toughness of 1/2 thickness, can meet the mechanical property of 620MPa grades of think gauge Marine Engineering Steels
It is required that.
(2) steel of the present invention yield strength >=620MPa at 1/4 and 1/2 in a thickness direction, tensile strength 720~
890MPa, elongation after fracture >=20%, -80 DEG C of Charpy-V impact power >=200J, zero ductility transition temperature (NDTT)≤- 60 DEG C, production
60~100mm of product thickness.
(3) manufacturing process of product of the present invention is easily achieved, and properties of product are stablized, and lumber recovery is high.
Description of the drawings
Fig. 1 is microscopic structure at the plate thickness 1/4 of embodiment 1；Fig. 2 is the steel plate center portion microscopic structure of embodiment 1；Micro- group
It is tempered sorbite to knit；
Specific implementation mode
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
The chemical composition of various embodiments of the present invention steel is as shown in table 1；The smelting process of various embodiments of the present invention steel such as 2 institute of table
Show；The rolling technological parameter of various embodiments of the present invention steel is as shown in table 3；The hardening and tempering process of various embodiments of the present invention steel such as 4 institute of table
Show；The mechanical property of steel embodiment steel of the present invention is as shown in table 5.
The chemical composition (wt%) of 1 steel of the embodiment of the present invention of table
| Embodiment | C | Si | Mn | Cu | Ni | Cr | Als | Nb | Ti | V |
| 1 | 0.05 | 0.50 | 1.00 | 0.50 | 1.75 | 1.25 | 0.021 | 0.030 | 0.019 | 0.055 |
| 2 | 0.10 | 0.25 | 1.20 | 0.25 | 1.68 | 1.45 | 0.044 | 0.032 | 0.012 | 0.062 |
| 3 | 0.07 | 0.37 | 1.30 | 0.28 | 1.71 | 1.30 | 0.043 | 0.032 | 0.018 | 0.055 |
| 4 | 0.09 | 0.20 | 1.24 | 0.22 | 1.65 | 1.26 | 0.035 | 0.031 | 0.019 | 0.052 |
| 5 | 0.08 | 0.25 | 1.15 | 0.30 | 1.70 | 1.33 | 0.042 | 0.026 | 0.010 | 0.058 |
| 6 | 0.06 | 0.46 | 1.16 | 0.50 | 1.72 | 1.46 | 0.037 | 0.037 | 0.015 | 0.067 |
| 7 | 0.05 | 0.50 | 1.25 | 0.43 | 1.66 | 1.48 | 0.030 | 0.039 | 0.011 | 0.068 |
| 8 | 0.06 | 0.40 | 1.40 | 0.37 | 1.79 | 1.40 | 0.041 | 0.032 | 0.013 | 0.051 |
Remarks：P≤0.01%, S≤0.01%, N≤0.005%.
1 steel smelting technique of the embodiment of the present invention of table
3 steel rolling technique of the embodiment of the present invention of table
4 steel quenching-and-tempering process of the embodiment of the present invention of table
5 steel conventional mechanical property of the embodiment of the present invention of table
From above example it is found that by the method for the present invention production Marine Engineering Steel, steel plate have high-yield strength (>=
650MPa), excellent low-temperature flexibility (- 80 DEG C of ballistic work >=210J), good fracture toughness (temperature≤- 60 DEG C NDTT) are good
The characteristics of good thickness direction contraction percentage of area (Z >=40%), big thickness (60~100mm of finished product thickness).
Claims (3)
1. a kind of good Marine Engineering Steel of low temperature fracture toughness, which is characterized in that chemical composition is by mass percentage in steel
For：C：0.05%~0.10%, Si：0.2%~0.5%, Mn：1.0%~1.5%, Cu：0.20%~0.50%, Cr：
1.00%~1.50%, Ni：1.6%~1.8%, P≤0.01%, S≤0.01%, Als：0.010%~0.050%, Nb：
0.020%~0.040%, Ti：0.010%~0.020%, V：0.050%~0.070%, remaining is for Fe and inevitably
Impurity, yield strength >=620MPa of steel plate.
2. a kind of good Marine Engineering Steel of low temperature fracture toughness as described in claim 1, which is characterized in that steel plate thickness
For 60~100mm.
3. a kind of manufacturing method of the good Marine Engineering Steel of low temperature fracture toughness as claimed in claim 1 or 2, steel plate
Production technology is：Smelting-heating strand-rolling-cooling-Tempering and Quenching, which is characterized in that
(1) it smelts：LF and RH refining furnaces handle 10~30min of each needs, middle packet molten steel overheat≤25 DEG C, and whole process protection pours
Casting；A, B, C, D type impurity meet in steel：The requirement of A≤1.0, B≤1.0, C≤1.0, D≤1.0；
(2) heating strand：Heating temperature is 1150~1200 DEG C, and soaking temperature is 1150~1180 DEG C, soaking time 30~
60min；
(3) it rolls：Two stage control rollings are carried out to continuous casting billet, the first stage rolls for recrystallization zone, rolling temperature control
Ranging from 950~1050 DEG C, single pass reduction ratio is 15% or more；Second stage rolls for Unhydrated cement, and rolling temperature is
840~880 DEG C, single pass reduction ratio is more than 10%；
(4) cooling：Average cooling rate is more than 3 DEG C/s, and red temperature is 500~600 DEG C, and steel plate carries out slow cooling, temperature retention time later
≥24h；
(5) heat treatment process：Using quenching-and-tempering process, including：Primary quenching temperature is 910~940 DEG C, soaking time system
Number：1.0~1.2min/mm, the type of cooling use water cooling；Secondary quenching temperature is 900~930 DEG C, soaking time coefficient：1.0
~1.2min/mm, the type of cooling use water cooling；Temperature is 580~620 DEG C, soaking time coefficient：2.0~2.5min/
Mm, the type of cooling is using air-cooled.
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