CN110129676A - A kind of LNG storage tank 7Ni steel plate and production technology - Google Patents
A kind of LNG storage tank 7Ni steel plate and production technology Download PDFInfo
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- CN110129676A CN110129676A CN201910445403.XA CN201910445403A CN110129676A CN 110129676 A CN110129676 A CN 110129676A CN 201910445403 A CN201910445403 A CN 201910445403A CN 110129676 A CN110129676 A CN 110129676A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000003860 storage Methods 0.000 title claims abstract description 21
- 238000005516 engineering process Methods 0.000 title abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 18
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 17
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 12
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims description 51
- 238000005496 tempering Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 16
- 229910001566 austenite Inorganic materials 0.000 claims description 15
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005272 metallurgy Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 6
- 238000001953 recrystallisation Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 30
- 239000011572 manganese Substances 0.000 description 15
- 239000011651 chromium Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004686 fractography Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D2211/008—Martensite
Landscapes
- 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 Steel (AREA)
Abstract
The invention discloses a kind of LNG storage tank 7Ni steel plates and production technology, it is related to iron and steel smelting technology field, chemical component and mass percent are as follows: C:0.02%~0.06%, Si:0.20%~0.35%, Ni:4.0%~8.0%, Mn:0.3%~0.7%, P≤0.005%, S≤0.005%, Al:0.03%~0.05%, Nb:0.02%~0.05%, Cr:0.2%~0.4%, surplus are Fe and inevitable impurity.Steel plate 690~790Mpa of tensile strength, 590~700MPa of yield strength, elongation percentage >=24%, the side knock function at -196 DEG C can be used for manufacturing storage and transport the pressure vessel etc. of LNG in >=100J.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of LNG storage tank 7Ni steel plate and production technology.
Background technique
With the development of economy, environment and resource problem have become the most important thing of various countries' development, and LNG is as a kind of clear
The energy clean, pollution-free, quantity of heat production is high, future gradually will occupy greater proportion in the energy in, and expansion makes natural gas
The important means for becoming China's Optimization of Energy Structure with range and preserving the ecological environment.Currently, being widely used in LNG storage both at home and abroad
Deposit, steel plate in means of transport is 9Ni steel, China, for save the cost, is dropped as poor Ni country on the basis of ensuring performance
Low Ni content is one of important channel.The correlative study of content nickel-saving type 7Ni steel is still in infancy, a small amount of pass existing at present
In the patent of 7Ni steel plate, a kind of " nickel-saving type 7Ni steel and its heat for ultra-low temperature surroundings of application number 201711306269.2
The production method for the treatment of process " discloses a kind of nickel-saving type 7Ni steel and its heat treatment process for ultra-low temperature surroundings, 7Ni steel
Ingredient: Ni:7.00%~7.60%, C:0.02%~0.06%, Si:0.03%~0.80%, Mn:0.10%~0.90%,
Cr:0.30%~0.60%, surplus are Fe and are inevitably mingled with that this has excellent strong modeling using the 7Ni steel that QLT is heat-treated
Property combination and outstanding low-temperature flexibility, it is fairly horizontal that performance has reached 9Ni steel." the one of application number 201310285597.4
The Ni mass fraction of steel involved by kind ultralow temperature pressure vessel high nickel steel and its manufacturing method " is 7.00%~7.50%, is adopted
9Ni steel can be substituted for manufacturing LNG storage tank with the 7Ni steel plate that quenching+tempering technique twice obtains.Application number
Steel involved by 201310494688.9 " a kind of the economical low-temperature steel of low Ni high Mn that can be used for -196 DEG C and its manufacturing method "
Mn mass fraction be 1.00%~1.50%, Ni mass fraction be 7.00%~8.00%, using quenching add-back firer twice
Skill, obtained Ni steel is in -196 DEG C of excellent tenacities." inexpensive ultralow temperature nickel steel and its manufacture of application number 201410369201.9
Method " uses normalizing+quenching+tempering technique, obtains the Ni steel of -196 DEG C of excellent tenacities.There are also UFC+TMCP technique is used, roll
Steel plate is directly quickly cooled to martensite transformation temperature or less substitution out-line quenching technique afterwards, simplifies the side of heat treatment procedure
Method improves the low-temperature flexibility of 7Ni steel plate.
Summary of the invention
The present invention in view of the above technical problems, the shortcomings that overcoming the prior art, provide a kind of LNG storage tank 7Ni steel plate and
Production technology reduces the content of Ni under the premise of guaranteeing the performance of LNG storage and transportation steel as far as possible, provides a kind of economical and can
Capable preparation method.
In order to solve the above technical problems, the present invention provides a kind of LNG storage tank 7Ni steel plate, chemical component and quality
Percentage is as follows: C:0.02%~0.06%, Si:0.20%~0.35%, Ni:4.0%~8.0%, and Mn:0.3%~
0.7%, P≤0.005%, S≤0.005%, Al:0.03%~0.05%, Nb:0.02%~0.05%, Cr:0.2%~
0.4%, surplus is Fe and inevitable impurity.
Technical effect: the present invention is designed using Nb, Cr microalloying section Ni type alloy, has innovated a kind of normalizing rolling+two
Phase region quenching+tempering production technology, eliminates and is quickly cooled down process after rolling, not only save energy, and is subsequent quencher
Skill is smoothly implemented to provide good plate shape, is finally obtained the LNG storage tank steel of excellent in mechanical performance.
The technical solution that the present invention further limits is:
Further, with a thickness of 8~30mm.
Another object of the present invention is to provide a kind of LNG storage tank 7Ni Plate Production techniques, including
Slab preparation: being made into raw materials for metallurgy by chemical composition, smelted in vacuum smelting furnace, be cast into ingot casting, then will
Ingot casting forges and presses squarely slab, air-cooled in lee；
Normalizing rolling: by slab in 1150~1250 DEG C of 2~3h of heat preservation；Two-phase control rolling is carried out to slab, wherein roughing is opened
Rolling temperature is 1000~1100 DEG C, and overall compression ratio is 40%~60%, and the start rolling temperature of finish rolling is 850~900 DEG C, overall compression ratio
It is 40%~70%, it is 750~850 DEG C of finishing temperature, then air-cooled；
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, again at 500~580 DEG C at 600~700 DEG C
Tempering, tempering rate are 5~20 DEG C/s, keep the temperature 0.5~2h, air-cooled.
A kind of preceding LNG storage tank 7Ni Plate Production technique, the chemical component and mass percent of steel plate are as follows:
C:0.05%, Si:0.25%, Mn:0.60%, Ni:7.2%, P:0.0045%, S:0.0030%, Al:0.038%, Cr:
0.28%, Nb:0.043%, surplus are Fe and inevitable impurity；
Slab preparation: being made into raw materials for metallurgy by chemical composition, smelted in vacuum smelting furnace, be cast into ingot casting, then will
The rectangular slab that ingot casting forges into a thickness of 80mm, it is air-cooled in lee；
Normalizing rolling: slab is sent to heating furnace, is heated to 1156 DEG C, keeps the temperature 2.6h, and taking-up is rolled；Two are carried out to slab
Stage rolling, wherein roughing rolls in austenite perfect recrystallization area, and start rolling temperature is 1100 DEG C, drafts 60%, finish rolling
It being rolled in austenite Unhydrated cement, start rolling temperature is 900 DEG C, drafts 63%, 790 DEG C of finishing temperature, then air-cooled, shape
It is rolled at 12mm thickness hot rolled steel plate；
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, being tempered again at 560 DEG C, tempering speed at 660 DEG C
Rate is 10 DEG C/s, keeps the temperature 1h, air-cooled.
A kind of preceding LNG storage tank 7Ni Plate Production technique, the chemical component and mass percent of steel plate are as follows:
C:0.06%, Si:0.23%, Mn:0.55%, Ni:7.3%, P:0.0043%, S:0.0031%, Al:0.035%, Cr:
0.25%, Nb:0.040%, surplus are Fe and inevitable impurity；
Slab preparation: being made into raw materials for metallurgy by chemical composition, smelted in vacuum smelting furnace, be cast into ingot casting, then will
The rectangular slab that ingot casting forges into a thickness of 80mm, it is air-cooled in lee；
Normalizing rolling: slab is sent to heating furnace, is heated to 1239 DEG C, keeps the temperature 2.1h, and taking-up is rolled；Two are carried out to slab
Stage rolling, wherein roughing rolls in austenite perfect recrystallization area, and start rolling temperature is 1100 DEG C, drafts 60%, finish rolling
It being rolled in austenite Unhydrated cement, start rolling temperature is 900 DEG C, drafts 45%, 790 DEG C of finishing temperature, then air-cooled, shape
It is rolled at 18mm thickness hot rolled steel plate；
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, being tempered again at 560 DEG C, tempering speed at 660 DEG C
Rate is 10 DEG C/s, keeps the temperature 1h, air-cooled.
The beneficial effects of the present invention are:
(1) nickel is non-carbide forming element in the present invention, can expand γ phase region, is austenite formation and stable element, not
Low-temperature flexibility is improved in the case where reducing intensity；Nickel can be such that the CCT curve of steel moves to right, to reduce critical quenching rate, mention
High-hardenability；Nickel, which is also improved low-temperature flexibility, reduces the important function of ductil-brittle transition temperature, therefore Ni is of the invention main
Alloy element；
(2) carbon is strong solution strengthening element and strong austenite stabilizer element in the present invention, is had actively to the intensity of steel plate
Influence, but have detrimental effect to tough, plasticity and welding performance, therefore, in order to make low-temperature steel plate that there is punching well
Toughness and welding performance are hit, it need to be by carbon content control in lower range；
(3) manganese mainly plays solution strengthening in the present invention, can make up the decline that carbon content reduces the intensity generated；Simultaneously
Manganese is the same with nickel, and the phase transition temperature of steel can be made to reduce, and properly increases the improvement that Mn/C and Mn/S is conducive to toughness, therefore the present invention
Using Mn as one of main alloying element；
(4) silicon is solution strengthening element and deoxidant element in the present invention, and the intensity of steel can be improved, can reduce in steelmaking process
The content of harmful element oxygen；Silicon can also inhibit phosphorus in crystalline substance other than being present in steel with manganese by a certain percentage and inhibiting manganese segregation
Boundary's segregation, but silicon can be such that the Low Temperature Impact Toughness of Heat-affected Zone of steel deteriorates, therefore silicone content control is 0.15~0.3%；
(5) harden ability of steel plate can be improved in the addition of chromium in the present invention, improves the intensity of steel plate；Micro Nb is added, and controls
Certain Nb/Si range is made, it is not only harmless to intensity and plasticity, but also be conducive to improve the welding performance of Wide and Thick Slab；S and P are
Harmful element in steel easily leads to segregation, reduces the low-temperature flexibility of steel, increases fire check sensibility when welding, therefore stringent
Control the content of P, S in steel；
(6) fractography of the invention is to be dispersed with martensite and rotary austenite on ferrite matrix；Mechanical performance index are as follows:
Yield strength is in 590~700MPa, and tensile strength is in 690~790MPa, elongation percentage >=24%, the side knock at -196 DEG C
Function is in >=100J.
Detailed description of the invention
Fig. 1 is 1 metallograph of example；
Fig. 2 is 2 metallograph of example.
Specific embodiment
Embodiment 1
A kind of LNG storage tank 7Ni steel plate and production technology provided in this embodiment, the chemical component and mass percent of steel plate are such as
Under: C:0.05%, Si:0.25%, Mn:0.60%, Ni:7.2%, P:0.0045%, S:0.0030%, Al:0.038%, Cr:
0.28%, Nb:0.043%, surplus are Fe and inevitable impurity.
Slab preparation: it is made into raw materials for metallurgy by chemical composition, is smelted in vacuum smelting furnace, is cast into ingot casting, so
Ingot casting is forged into the rectangular slab with a thickness of 80mm afterwards, it is air-cooled in lee.
Normalizing rolling: slab is sent to heating furnace, is heated to 1156 DEG C, keeps the temperature 2.6h, and taking-up is rolled；To slab into
Row two-phase control rolling, wherein roughing rolls in austenite perfect recrystallization area, and start rolling temperature is 1100 DEG C, drafts 60%,
Finish rolling is rolled in austenite Unhydrated cement, and start rolling temperature is 900 DEG C, drafts 63%, 790 DEG C of finishing temperature, then empty
It is cold, it forms 12mm thickness hot rolled steel plate and rolls.
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, again in 560 DEG C of tempering at 660 DEG C, is returned
Rate is 10 DEG C/s at top speed, keeps the temperature 1h, air-cooled.
The low-temperature steel plate that this example obtains is detected according to concerned countries standard, and testing result is shown in Table 1.
Table 1: 1 low-temperature steel plate performance of example
Embodiment 2
A kind of LNG storage tank 7Ni steel plate and production technology provided in this embodiment, the chemical component and mass percent of steel plate are such as
Under: C:0.06%, Si:0.23%, Mn:0.55%, Ni:7.3%, P:0.0043%, S:0.0031%, Al:0.035%, Cr:
0.25%, Nb:0.040%, surplus are Fe and inevitable impurity.
Slab preparation: it is made into raw materials for metallurgy by chemical composition, is smelted in vacuum smelting furnace, is cast into ingot casting, so
Ingot casting is forged into the rectangular slab with a thickness of 80mm afterwards, it is air-cooled in lee.
Normalizing rolling: slab is sent to heating furnace, is heated to 1239 DEG C, keeps the temperature 2.1h, and taking-up is rolled；To slab into
Row two-phase control rolling, wherein roughing rolls in austenite perfect recrystallization area, and start rolling temperature is 1100 DEG C, drafts 60%,
Finish rolling is rolled in austenite Unhydrated cement, and start rolling temperature is 900 DEG C, drafts 45%, 790 DEG C of finishing temperature, then empty
It is cold, it forms 18mm thickness hot rolled steel plate and rolls.
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, again in 560 DEG C of tempering at 660 DEG C, is returned
Rate is 10 DEG C/s at top speed, keeps the temperature 1h, air-cooled.
The low-temperature steel plate that this example obtains is detected according to concerned countries standard, and testing result is shown in Table 2.
Table 2: 2 low-temperature steel plate performance of example
Compared with prior art, the present invention being designed by the alloy for subtracting nickel, produced using normalizing rolling+two-phase section quenching+tempering
9Ni standard in GB 3531-2014 steel for low-temperature pressure container is fully achieved in performance, substantially reduces production cost for technique.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (5)
1. a kind of LNG storage tank 7Ni steel plate, which is characterized in that its chemical component and mass percent are as follows: C:0.02%~
0.06%, Si:0.20%~0.35%, Ni:4.0%~8.0%, Mn:0.3%~0.7%, P≤0.005%, S≤0.005%, Al:
0.03%~0.05%, Nb:0.02%~0.05%, Cr:0.2%~0.4%, surplus are Fe and inevitable impurity.
2. a kind of LNG storage tank 7Ni steel plate according to claim 1, it is characterised in that: with a thickness of 8~30mm.
3. a kind of LNG storage tank 7Ni Plate Production technique, it is characterised in that: including
Slab preparation: being made into raw materials for metallurgy by chemical composition, smelted in vacuum smelting furnace, be cast into ingot casting, then will
Ingot casting forges and presses squarely slab, air-cooled in lee；
Normalizing rolling: by slab in 1150~1250 DEG C of 2~3h of heat preservation；Two-phase control rolling is carried out to slab, wherein roughing is opened
Rolling temperature is 1000~1100 DEG C, and overall compression ratio is 40%~60%, and the start rolling temperature of finish rolling is 850~900 DEG C, overall compression ratio
It is 40%~70%, it is 750~850 DEG C of finishing temperature, then air-cooled；
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, again at 500~580 DEG C at 600~700 DEG C
Tempering, tempering rate are 5~20 DEG C/s, keep the temperature 0.5~2h, air-cooled.
4. a kind of LNG storage tank according to claim 3 7Ni Plate Production technique, it is characterised in that:
The chemical component and mass percent of steel plate are as follows: C:0.05%, Si:0.25%, Mn:0.60%, Ni:7.2%, P:
0.0045%, S:0.0030%, Al:0.038%, Cr:0.28%, Nb:0.043%, surplus are Fe and inevitable impurity；
Slab preparation: being made into raw materials for metallurgy by chemical composition, smelted in vacuum smelting furnace, be cast into ingot casting, then will
The rectangular slab that ingot casting forges into a thickness of 80mm, it is air-cooled in lee；
Normalizing rolling: slab is sent to heating furnace, is heated to 1156 DEG C, keeps the temperature 2.6h, and taking-up is rolled；Two are carried out to slab
Stage rolling, wherein roughing rolls in austenite perfect recrystallization area, and start rolling temperature is 1100 DEG C, drafts 60%, finish rolling
It being rolled in austenite Unhydrated cement, start rolling temperature is 900 DEG C, drafts 63%, 790 DEG C of finishing temperature, then air-cooled, shape
It is rolled at 12mm thickness hot rolled steel plate；
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, being tempered again at 560 DEG C, tempering speed at 660 DEG C
Rate is 10 DEG C/s, keeps the temperature 1h, air-cooled.
5. a kind of LNG storage tank according to claim 3 7Ni Plate Production technique, it is characterised in that:
The chemical component and mass percent of steel plate are as follows: C:0.06%, Si:0.23%, Mn:0.55%, Ni:7.3%, P:
0.0043%, S:0.0031%, Al:0.035%, Cr:0.25%, Nb:0.040%, surplus are Fe and inevitable impurity；
Slab preparation: being made into raw materials for metallurgy by chemical composition, smelted in vacuum smelting furnace, be cast into ingot casting, then will
The rectangular slab that ingot casting forges into a thickness of 80mm, it is air-cooled in lee；
Normalizing rolling: slab is sent to heating furnace, is heated to 1239 DEG C, keeps the temperature 2.1h, and taking-up is rolled；Two are carried out to slab
Stage rolling, wherein roughing rolls in austenite perfect recrystallization area, and start rolling temperature is 1100 DEG C, drafts 60%, finish rolling
It being rolled in austenite Unhydrated cement, start rolling temperature is 900 DEG C, drafts 45%, 790 DEG C of finishing temperature, then air-cooled, shape
It is rolled at 18mm thickness hot rolled steel plate；
Two-phase section quenching+tempering: the steel plate after rolling is quenched to 300 DEG C hereinafter, being tempered again at 560 DEG C, tempering speed at 660 DEG C
Rate is 10 DEG C/s, keeps the temperature 1h, air-cooled.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910445403.XA CN110129676A (en) | 2019-05-27 | 2019-05-27 | A kind of LNG storage tank 7Ni steel plate and production technology |
| KR1020217040526A KR20220004220A (en) | 2019-05-27 | 2019-10-16 | 7Ni steel plate and production process for LNG storage tank |
| PCT/CN2019/111410 WO2020237975A1 (en) | 2019-05-27 | 2019-10-16 | 7ni steel plate for lng storage tank and production process |
| JP2021569882A JP7340627B2 (en) | 2019-05-27 | 2019-10-16 | Manufacturing method of 7Ni steel plate for LNG storage tank |
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| JP (1) | JP7340627B2 (en) |
| KR (1) | KR20220004220A (en) |
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| WO (1) | WO2020237975A1 (en) |
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| WO2020237975A1 (en) * | 2019-05-27 | 2020-12-03 | 南京钢铁股份有限公司 | 7ni steel plate for lng storage tank and production process |
| WO2021036272A1 (en) * | 2019-08-24 | 2021-03-04 | 江阴兴澄特种钢铁有限公司 | High-strength and low-yield-ratio 9ni steel plate for ship lng storage tanks and manufacturing method therefor |
| CN112941405A (en) * | 2021-01-26 | 2021-06-11 | 南京钢铁股份有限公司 | High-toughness heat-resistant flat-bulb steel for ships and preparation method thereof |
| CN114686760A (en) * | 2022-03-24 | 2022-07-01 | 南京钢铁股份有限公司 | Steel for 7Ni and production method thereof |
| CN114737111A (en) * | 2022-03-24 | 2022-07-12 | 南京钢铁股份有限公司 | Steel for 5Ni and production method thereof |
| CN115747652A (en) * | 2022-11-15 | 2023-03-07 | 北京科技大学 | Nb7 Ni-containing ultralow-temperature steel for nickel-saving LNG storage tank and heat treatment process thereof |
| WO2023155511A1 (en) * | 2022-02-16 | 2023-08-24 | 南京钢铁股份有限公司 | Method for controlling surface quality of nickel-based steel plate |
| CN117758030A (en) * | 2023-12-26 | 2024-03-26 | 湖南华菱湘潭钢铁有限公司 | A kind of 7Ni steel medium-thick plate and its production method and application |
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| CN119053721A (en) * | 2022-05-19 | 2024-11-29 | 杰富意钢铁株式会社 | Steel sheet and method for producing same |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014034708A (en) * | 2012-08-09 | 2014-02-24 | Nippon Steel & Sumitomo Metal | Thick steel plate for ultra-low temperature and production method thereof |
| CN104674110A (en) * | 2015-02-09 | 2015-06-03 | 北京科技大学 | Lower temperature steel plate for pressure vessels and production method thereof |
| CN104854252A (en) * | 2012-12-13 | 2015-08-19 | 株式会社神户制钢所 | Thick steel plate having excellent cryogenic toughness |
| CN105543694A (en) * | 2015-12-29 | 2016-05-04 | 东北大学 | Preparation method of 7Ni steel plate for liquefied natural gas storage tank |
| JP2017160510A (en) * | 2016-03-11 | 2017-09-14 | 新日鐵住金株式会社 | Nickel steel sheet for low temperature and manufacturing method therefor |
| CN107937824A (en) * | 2017-12-11 | 2018-04-20 | 中国科学院金属研究所 | A kind of nickel-saving type 7Ni steel and its heat treatment process for ultra-low temperature surroundings |
| CN109280848A (en) * | 2018-10-17 | 2019-01-29 | 东北大学 | Steel plate for low-nickel liquefied natural gas storage tank and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007080646A1 (en) * | 2006-01-13 | 2007-07-19 | Sumitomo Metal Industries, Ltd. | Cryogenic steel |
| CN102586696A (en) * | 2012-03-14 | 2012-07-18 | 江苏省沙钢钢铁研究院有限公司 | 7Ni steel applied to cryogenic environment and preparation process thereof |
| JP5594329B2 (en) * | 2012-07-23 | 2014-09-24 | Ｊｆｅスチール株式会社 | Ni-containing thick steel plate with excellent low-temperature toughness |
| KR101572786B1 (en) * | 2013-06-19 | 2015-11-27 | 신닛테츠스미킨 카부시키카이샤 | Steel plate, process for producing same, and lng tank |
| CN103556051A (en) * | 2013-10-14 | 2014-02-05 | 唐山学院 | Low-temperature steel realizing toughening based on C and Ni combined effect and preparation method thereof |
| CN110129676A (en) * | 2019-05-27 | 2019-08-16 | 南京钢铁股份有限公司 | A kind of LNG storage tank 7Ni steel plate and production technology |
-
2019
- 2019-05-27 CN CN201910445403.XA patent/CN110129676A/en active Pending
- 2019-10-16 KR KR1020217040526A patent/KR20220004220A/en not_active Ceased
- 2019-10-16 WO PCT/CN2019/111410 patent/WO2020237975A1/en active Application Filing
- 2019-10-16 JP JP2021569882A patent/JP7340627B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014034708A (en) * | 2012-08-09 | 2014-02-24 | Nippon Steel & Sumitomo Metal | Thick steel plate for ultra-low temperature and production method thereof |
| CN104854252A (en) * | 2012-12-13 | 2015-08-19 | 株式会社神户制钢所 | Thick steel plate having excellent cryogenic toughness |
| CN104674110A (en) * | 2015-02-09 | 2015-06-03 | 北京科技大学 | Lower temperature steel plate for pressure vessels and production method thereof |
| CN105543694A (en) * | 2015-12-29 | 2016-05-04 | 东北大学 | Preparation method of 7Ni steel plate for liquefied natural gas storage tank |
| JP2017160510A (en) * | 2016-03-11 | 2017-09-14 | 新日鐵住金株式会社 | Nickel steel sheet for low temperature and manufacturing method therefor |
| CN107937824A (en) * | 2017-12-11 | 2018-04-20 | 中国科学院金属研究所 | A kind of nickel-saving type 7Ni steel and its heat treatment process for ultra-low temperature surroundings |
| CN109280848A (en) * | 2018-10-17 | 2019-01-29 | 东北大学 | Steel plate for low-nickel liquefied natural gas storage tank and preparation method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020237975A1 (en) * | 2019-05-27 | 2020-12-03 | 南京钢铁股份有限公司 | 7ni steel plate for lng storage tank and production process |
| WO2021036272A1 (en) * | 2019-08-24 | 2021-03-04 | 江阴兴澄特种钢铁有限公司 | High-strength and low-yield-ratio 9ni steel plate for ship lng storage tanks and manufacturing method therefor |
| CN112941405A (en) * | 2021-01-26 | 2021-06-11 | 南京钢铁股份有限公司 | High-toughness heat-resistant flat-bulb steel for ships and preparation method thereof |
| CN112941405B (en) * | 2021-01-26 | 2022-04-19 | 南京钢铁股份有限公司 | High-toughness heat-resistant flat-bulb steel for ships and preparation method thereof |
| WO2023155511A1 (en) * | 2022-02-16 | 2023-08-24 | 南京钢铁股份有限公司 | Method for controlling surface quality of nickel-based steel plate |
| CN114686760A (en) * | 2022-03-24 | 2022-07-01 | 南京钢铁股份有限公司 | Steel for 7Ni and production method thereof |
| CN114737111A (en) * | 2022-03-24 | 2022-07-12 | 南京钢铁股份有限公司 | Steel for 5Ni and production method thereof |
| CN115747652A (en) * | 2022-11-15 | 2023-03-07 | 北京科技大学 | Nb7 Ni-containing ultralow-temperature steel for nickel-saving LNG storage tank and heat treatment process thereof |
| CN117758030A (en) * | 2023-12-26 | 2024-03-26 | 湖南华菱湘潭钢铁有限公司 | A kind of 7Ni steel medium-thick plate and its production method and application |
Also Published As
| Publication number | Publication date |
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| KR20220004220A (en) | 2022-01-11 |
| JP2022534079A (en) | 2022-07-27 |
| WO2020237975A1 (en) | 2020-12-03 |
| JP7340627B2 (en) | 2023-09-07 |
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Application publication date: 20190816 |