CN106191686B - A kind of shipping steel 800MPa grades and preparation method thereof - Google Patents
A kind of shipping steel 800MPa grades and preparation method thereof Download PDFInfo
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- CN106191686B CN106191686B CN201610538979.7A CN201610538979A CN106191686B CN 106191686 B CN106191686 B CN 106191686B CN 201610538979 A CN201610538979 A CN 201610538979A CN 106191686 B CN106191686 B CN 106191686B
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
-
- 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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
Abstract
A kind of 800MPa grades shipping steel and preparation method thereof, belongs to steel material technical field.Its chemical ingredients by weight percent is：C：0.05~0.10%, Si：0.10~0.25%, Mn：0.20~1.0%, P≤0.015%, S≤0.010%, B≤0.0015%, Ni：3.5~5.5%, Cr：0.3~0.9%, Mo：0.2~0.7% etc..By converter smelting；1150~1200 DEG C are heated to, 2.5~3.5h is incubated；By recrystallization zone rolling and Unhydrated cement rolling；Then control cold；Last quenching heat treatment, hardening heat is 880~930 DEG C.Advantage is, intensity is high, good plasticity and the characteristics of excellent crack arrest characteristic.
Description
Technical field
The invention belongs to steel material technical field, more particularly to a kind of 800MPa grades shipping steel and its preparation side
Method.More particularly to a kind of shipping steels of 800MPa grades of NDTT less than -80 DEG C and preparation method thereof.
Background technology
With the development of shipbuilding industry, to the intensity of shipping steel material, toughness, weldability and surface quality performance
It is required that improving constantly.Especially for the ton above ship of off-lying sea navigating area, load is improved in order to mitigate deadweight, its hull is needed
Using high-strength steel sheet；While security and reliability in order to ensure ship, it is desirable to which the deck of boat has under low temperature Service Environment
There are good toughness and relatively low NDT temperature.
Current yield strength mainly includes two classes higher than the production method of 700MPa grades of high-strength steel：One class is low-carbon bainite
Steel series, more by adding the alloying elements such as Mo, Ni, Cr to improve solid solution strengthening effect, another kind of steel plate mainly takes addition
Ti, Nb, V micro alloying element, intensity is improved by precipitation strength and refined crystalline strengthening.On the other hand, Ni is to improve steel
The best element of the low-temperature flexibility effect of material, therefore 1.5Ni, 3.5Ni, 5Ni and 9Ni have been developed according to the difference of Ni contents
Deng the cryogenic steel of different stage, these steel grades are generally steel for low-temperature pressure container.
Patent No. CN102644030B provides a kind of production method of 800MPa grade low-temps steel, and the steel grade takes low
C high Si, Mn, Cr and Nb, the composition design of Ti microalloyings, specific composition are C：0.04~0.14%, Si：0.20~
0.50%, Mn：1.0~1.80%, Als：0.015~0.05%, P≤0.01%, S≤0.008%, Cr：0.10~0.50%,
Ti：0.01~0.03%, Nb：0.10~0.50%, B：0.0008~0.0020%, remaining is Fe and inevitable impurity.Adopt
Two-phase control rolling is taken, the PROCESS FOR TREATMENT of rear press quenching+tempering is rolled.Under technique described in the patent, yield strength is more than 800MPa,
Elongation percentage is more than 18%, and -60 DEG C of ballistic works are more than 170J.From the patent from the point of view of intensity and impact flexibility index it is more excellent, but should
Patent does not study its NDTT performance.
Patent No. CN104388838A provides a kind of production method of pressure vessel 5Ni steel plates, steel grade chemistry
Composition is as follows, C：0.07~0.10%, Si：0.15~0.30%, Mn：0.70~0.80%, P≤0.008%, S≤
0.003%th, Ni：4.90~5.25%, Alt：0.020~0.050%, Sn≤0.015%, Sb≤0.003%.Described in the patent
The 5Ni steel yield strength produced under technique is more than 450MPa, and tensile strength is more than 590MPa, and elongation after fracture is more than 25% ,~
125 DEG C of ballistic work averages are higher than 180J.Although the patent low-temperature good toughness, its yield strength is relatively low.
The content of the invention
It is an object of the invention to provide a kind of 800MPa grades shipping steel and preparation method thereof, off-lying sea navigating area is solved
The problem of steel for ship requires high intensity, good toughness, excellent crack arrest characteristic.Realize and controlled rolling+tune is used on generous printed line
Matter technique productions shipping steel, reaches yield strength >=800MPa, tensile strength >=900MPa, elongation after fracture >=17%, -84
DEG C ballistic work >=130J, NDTT≤- 80 DEG C, steel plate thickness specification is 20~40mm.
A kind of shipping steel 800MPa grades, wherein, chemical ingredients by weight percent is：C：0.05~0.10%, Si：
0.10~0.25%, Mn：0.20~1.0%, P≤0.015%, S≤0.010%, B≤0.0015%, Ni：3.5~5.5%,
Cr：0.3~0.9%, Mo：0.2~0.7%, V：0.02~0.13%, remaining is Fe and inevitable impurity.
The preparation method of a kind of 800MPa grades shipping steel, specific steps and parameter are as follows：
1st, heating cycle：By heating steel billet to 1150~1200 DEG C, 2.5~3.5h is incubated；
2nd, rolling mill practice：Using controlled rolling process, the operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement
Rolling；Recrystallization zone stage rolling start rolling temperature is 1070~1120 DEG C, adds up reduction ratio >=50%, and middle base treats that temperature thickness is
2~4 times of finished product thicknesses；Temperature is treated to 850~890 DEG C of progress Unhydrated cement rollings, finishing temperature is 800~840 DEG C, is not tied again
Accumulative reduction ratio >=20% of crystalline substance；
3rd, roller repairing technique：Roller repairing technique is two kinds, that is, is air-cooled to room temperature after rolling, or roll rear water cooling to 420~
470 DEG C, cooling by water speed is 10~15 DEG C/s.
4th, the quenching-and-tempering process of quenching+tempering：Hardening heat is 880~930 DEG C, and soaking time is 2.5min/
Mmt, rear water quenching；Temperature is 610~650 DEG C, and soaking time is 3min/mm*t, is then air-cooled to room temperature, and wherein t is
Finished product thickness.
The composition design thinking of the present invention is as follows：C content:0.05~0.10wt%, had both ensured that steel plate had certain consolidate
Molten reinforcing effect, and relatively low carbon content causes the steel grade to have relatively low ductile-brittle transition temperature and good welding
Property；Higher Ni:3.5~5.5wt% contents, the resistance that dislocation is moved in the base when can reduce low temperature, while improving layer
Wrong energy, suppresses a large amount of formation of dislocation during low temperature, the commutative Banach aglebra of dislocation during promotion low temperature so that the consumption work(of Crack Extension increases
Plus, the ductile-brittle transition temperature of steel is reduced, so as to significantly improve the low-temperature flexibility of material；V：0.02~0.13wt% the side of addition one
Face can form hardening constituent with C and N, so as to ensure the intensity of material, while V addition can ensure the hardness of quenched rear material
Stability；Solution strengthening is played a part of in the addition of Mn, Mo and Cr element, while improving the quenching degree of material；Strict control steel
The degree of purity of water, it is to avoid the influence of impurity element P, S to the mechanical property and low-temperature flexibility of steel plate.
The technological design thinking of the present invention is as follows：First stage recrystallization zone rolling uses higher reduction ratio, it is ensured that steel
The compactness of plate and the uniformity of original austenite grain；The rolling of second stage Unhydrated cement uses controlled rolling process, it is ensured that group
Knit crystal grain tiny；Pass through rational hardening and tempering process, it is ensured that steel plate has high intensity concurrently and good low-temperature flexibility.
It is an advantage of the current invention that the characteristics of the armor plate strength height of production, good plasticity and excellent crack arrest characteristic, embodying
：Yield strength >=800MPa, tensile strength >=900MPa, elongation after fracture >=17%, -84 DEG C of ballistic work >=130J, NDTT
≤-80℃。
Brief description of the drawings
Fig. 1 is the micro-organization chart of embodiment 1.
Embodiment
Embodiment 1
The chemical component weight percentage of steel billet includes, C：0.081%, Si：0.22%, Mn：0.84%, P：0.007%,
S：0.0041%, B：0.001%, Ni：4.78%, Cr：0.74%, Mo：0.62%, V：0.050%, remaining is Fe and can not kept away
Exempt from impurity.
1st, smelt and forge：Made steel using 500Kg vacuum smelting furnaces, 175mm steel billets are forged to after the completion of casting；
2nd, heating cycle：1200 DEG C are heated to, 3h is incubated；
3rd, rolling mill practice：The operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement rolling：Recrystallization zone
Stage rolling start rolling temperature is 1087 DEG C, and 4 passages to middle base is rolled altogether and treats temperature thickness 60mm；Treat that warm to 870 DEG C are carried out not again
Crystal region is rolled, and 817 DEG C of finishing temperature rolls 5 passages to target thickness 20mm altogether；
4th, roller repairing technique：Room temperature is air-cooled to after rolling；
5th, Technology for Heating Processing：Water quenching after 900 DEG C of insulation 50min of hardening heat, 650 DEG C of insulation 60min of temperature, comes out of the stove
Air cooling；
Mechanics properties testing is carried out to the 800MPa levels shipping steel of the present embodiment, mechanical property is：Yield strength
847MPa, tensile strength 913MPa, elongation after fracture 20.0%, -20 DEG C of side knock work(：227J, 210J, 217J, -84 DEG C of horizontal strokes
To ballistic work：139J, 177J, 178J, -80 DEG C of drop hammer test results show that the crackle of formation of crack welding bead formation does not expand to tension
The seamed edge in face, block hammer performance is qualified.
Embodiment 2
The chemical composition of steel billet content by weight percentage includes, C：0.078%, Si：0.21%, Mn：0.69%, P：
0.007%, S：0.0041%, B：0.0006%, Ni：4.5%, Cr：0.667%, Mo：0.527%, V：0.043%, remaining is
Fe and inevitable impurity.
Smelt and forging, heating cycle be the same as Example 1.
Rolling mill practice：The operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement rolling：Recrystallization zone rank
Section rolling start rolling temperature is 1057 DEG C, and 4 passages to middle base is rolled altogether and treats temperature thickness 60mm；Treat that temperature is not tied again to 860 DEG C
Crystalline region is rolled, and 810 DEG C of finishing temperature rolls 5 passages to target thickness 20mm altogether；
Roller repairing technique：Rear water cooling is rolled to 450 DEG C, and then 12 DEG C/s of cooling velocity is air-cooled to room temperature；
Technology for Heating Processing：Water quenching after 900 DEG C of insulation 50min of hardening heat, 640 DEG C of insulation 60min of temperature, sky of coming out of the stove
It is cold；
Mechanics properties testing is carried out to the 800MPa levels shipping steel of the present embodiment, mechanical property is：Yield strength
912MPa, tensile strength 953MPa, elongation after fracture 17.0%, -20 DEG C of side knock work(：203J, 202J, 195J, -84 DEG C of horizontal strokes
To ballistic work：163J, 142J, 150J, -80 DEG C of drop hammer test results show that the crackle of formation of crack welding bead formation does not expand to tension
The seamed edge in face, block hammer performance is qualified.
Embodiment 3
The chemical composition of steel billet content by weight percentage includes, C：0.076%, Si：0.20%, Mn：0.83%, P：
0.007%, S：0.0044%, B：0.0003%, Ni：4.83%, Cr：0.73%, Mo：0.521%, V：0.039%, remaining is
Fe and inevitable impurity.
Smelt and forging, heating cycle be the same as Example 1；
Rolling mill practice：The operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement rolling：Recrystallization zone rank
Section rolling start rolling temperature is 1050 DEG C, and 3 passages to middle base is rolled altogether and treats temperature thickness 85mm；Treat that temperature is not tied again to 850 DEG C
Crystalline region is rolled, and 820 DEG C of finishing temperature rolls 3 passages to target thickness 40mm altogether；
Roller repairing technique：Room temperature is air-cooled to after rolling；
Technology for Heating Processing：Water quenching after 910 DEG C of insulation 100min of hardening heat, 620 DEG C of insulation 120min of temperature, comes out of the stove
Air cooling；
Mechanics properties testing is carried out to the 800MPa levels shipping steel of the present embodiment, mechanical property is：Yield strength
899MPa, tensile strength 942MPa, elongation after fracture 19.0%, -20 DEG C of side knock work(：187J, 195J, 202J, -84 DEG C of horizontal strokes
To ballistic work：147th, 153,159J, -80 DEG C of drop hammer test results show that the crackle of formation of crack welding bead formation does not expand to tension face
Seamed edge, block hammer performance is qualified.
Claims (2)
1. a kind of 800MPa grades shipping steel, it is characterised in that chemical ingredients by weight percent is：C：0.05~0.10%,
Si：0.10~0.25%, Mn：0.20~1.0%, P≤0.015%, S≤0.010%, B≤0.0015%, Ni：3.5~
5.5%th, Cr：0.3~0.9%, Mo：0.2~0.7%, V：0.02~0.13%, remaining is Fe and inevitable impurity；
The performance of described 800MPa grades shipping steel：Yield strength >=800MPa, tensile strength >=900MPa, elongation after fracture
>=17%, -84 DEG C of ballistic work >=130J, NDTT≤- 80 DEG C.
2. the preparation method of the shipping steel described in a kind of claim 1, it is characterised in that specific steps and parameter are as follows：
1) heating cycle：By heating steel billet to 1150~1200 DEG C, 2.5~3.5h is incubated；
2) rolling mill practice：Using controlled rolling process, the operation of rolling is divided into two stages, and recrystallization zone rolling and Unhydrated cement roll
System；
Recrystallization zone stage rolling start rolling temperature is 1070~1120 DEG C, adds up reduction ratio >=50%, and middle base treats that temperature thickness is 2
~4 times of finished product thicknesses；Temperature is treated to 850~890 DEG C of progress Unhydrated cement rollings, finishing temperature is 800~840 DEG C, is not tied again
Accumulative reduction ratio >=20% of crystalline substance；
3) roller repairing technique：Roller repairing technique is air cooling or water cooling；Room temperature is air-cooled to after rolling, or rolls rear water cooling to 420
~470 DEG C, cooling by water speed is 10~15 DEG C/s；
4) quenching-and-tempering process of quenching+tempering：Hardening heat is 880~930 DEG C, and soaking time is 2.5min/mmt,
Water quenching afterwards；Temperature is 610~650 DEG C, and soaking time is 3min/mmt, is then air-cooled to room temperature；T is finished product thickness.
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| CN114395731B (en) * | 2021-12-16 | 2023-01-24 | 南阳汉冶特钢有限公司 | Low-welding crack sensitivity crack arrest steel HY950CF for hydroelectric engineering and production method thereof |
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| JP2003253380A (en) * | 2002-02-26 | 2003-09-10 | Jfe Steel Kk | High-strength steel superior in toughness of heat- affected zone by ultra-high heat input welding |
| CN102337460B (en) * | 2011-11-14 | 2013-01-09 | 首钢总公司 | Ultrahigh-strength structural steel board for ocean engineering and production method thereof |
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| CN104195428A (en) * | 2014-07-31 | 2014-12-10 | 南京钢铁股份有限公司 | High-strength V-containing and low-C 5Ni steel medium plate and manufacturing method of steel medium plate |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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