CN109321838A - High silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method - Google Patents
High silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method Download PDFInfo
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- CN109321838A CN109321838A CN201811006696.3A CN201811006696A CN109321838A CN 109321838 A CN109321838 A CN 109321838A CN 201811006696 A CN201811006696 A CN 201811006696A CN 109321838 A CN109321838 A CN 109321838A
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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
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/12—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses a kind of high silicon content 440MPa grade low-temp ductile structure steel plates, it is related to iron and steel smelting technology field, its chemical component and mass percent are as follows: C:0.08%~0.12%, Mn:1.40%~1.60%, Si:0.50%~0.80%, P≤0.020%, S≤0.005%, Nb:0.020%~0.035%, V≤0.040%, Ti≤0.020%, Alt:0.020%~0.050%, N≤0.006%, CEV≤0.42%, surplus is Fe and impurity, wherein CEV=C+Mn/6+Si/24+Cr/5+Ni/40+Cu/13+V/14+P/2.- 40 DEG C~-70 DEG C low temperature impact properties of steel plate are excellent, meet the requirements such as low temperature military service, the easy welding under severe cold environment.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of high silicon content 440MPa grade low-temp toughness knot
Structure steel plate and manufacturing method.
Background technique
China is energy importation big country, and Russian energy project belongs to Sino-Russian great cooperation in the field of energy project, Russian project industry
Main design uses GOST standard series low temperature structure steel plate, it is desirable that low-carbon, high silicon content design, -20 DEG C~-70 DEG C of guarantee are low
Temperature impact and 10% strain-aging impact property meet the low temperature military service under the severe cold environments such as Russia, the easily use such as welding is wanted
It asks, comprehensive mechanical property index reaches external similar level.
09G2S is the trade mark of steel specified in GOST 19281-2014 standard " high-intensitive stocking ", to C, Si, CEV etc.
Ingredient has harsh requirement, especially Si content requirement 0.50%~0.80%, and strength grade 440MPa is highest in the standard
Rank also comprises -20 DEG C~-70 DEG C KCU of impact grade or -20 DEG C~-40 DEG C KCV impacts and the punching of 10% strain-aging
It hits.Because steel grade Si content 0.50%~0.80% is higher, the relevant criterions steel grade Si upper content limit such as GB/T1591 is exceeded and has wanted
It asks, can be temporarily compared without homogenous quantities grade steel grade.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of high silicon content 440MPa grade low-temp ductile structure steel plate,
Its chemical component and mass percent are as follows: C:0.08%~0.12%, Mn:1.40%~1.60%, Si:0.50%~
0.80%, P≤0.020%, S≤0.005%, Nb:0.020%~0.035%, V≤0.040%, Ti≤0.020%, Alt:
0.020%~0.050%, N≤0.006%, CEV≤0.42%, surplus are Fe and impurity, wherein CEV=C+Mn/6+Si/24
+Cr/5+Ni/40+Cu/13+V/14+P/2。
Technical effect: the present invention is designed on the basis of Si content 0.50%~0.80% using low-carbon ingredient, and addition contains
Lower Nb, V, Ti microalloying is measured, does not add the expensive alloying elements such as Ni, the 440MPa rank low-temperature flexibility knot developed
Structure plate property reaches 19281 standard requirements of GOST, and steel plate low temperature impact properties are excellent, meets the low temperature clothes under severe cold environment
Labour, the easily requirements such as welding.
The technical solution that the present invention further limits is:
The preceding high silicon content 440MPa grade low-temp ductile structure steel plate, steel plate thickness are 6mm~50mm.
The preceding high silicon content 440MPa grade low-temp ductile structure steel plate, steel plate thickness 10mm, chemical component and
Mass percent is as follows: C:0.09%, Mn:1.48%, Si:0.62%, P:0.013%, S:0.002%, Nb:0.025%,
V:0.033%, Ti:0.012%, Alt:0.033%, CEV:0.38%, surplus are Fe and impurity.
The preceding high silicon content 440MPa grade low-temp ductile structure steel plate, steel plate thickness 12mm, chemical component and
Mass percent is as follows: C:0.11%, Mn:1.53%, Si:0.55%, P:0.012%, S:0.002%, Nb:0.028%,
V:0.037%, Ti:0.015%, Alt:0.041%, CEV:0.40%, surplus are Fe and impurity.
The preceding high silicon content 440MPa grade low-temp ductile structure steel plate, steel plate thickness 50mm, chemical component and
Mass percent is as follows: C:0.10%, Mn:1.55%, Si:0.60%, P:0.010%, S:0.003%, Nb:0.032%,
V:0.036%, Ti:0.014%, Alt:0.034%, CEV:0.40%, surplus are Fe and impurity.
Another object of the present invention is to provide a kind of manufacturers of high silicon content 440MPa grade low-temp ductile structure steel plate
Method, comprising the following steps:
S1, steel-making: use converter deep dephosphorization, molten steel P≤0.020%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization, molten steel S≤
0.005%, slab is prepared in continuous casting；
S2, heating: heating temperature is 1220 DEG C~1250 DEG C, and heating time is 150min~300min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1000 DEG C~1050 DEG C；Second stage
Start rolling temperature is 890 DEG C~960 DEG C, and finishing temperature is 800 DEG C~850 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 4 DEG C/s~8 DEG C/s, and red temperature is 640 DEG C~680
℃。
The manufacturing method of the preceding high silicon content 440MPa grade low-temp ductile structure steel plate, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.013%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.002%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1239 DEG C, heating time 244min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1038 DEG C；Second stage start rolling temperature
It is 960 DEG C, finishing temperature is 831 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 4 DEG C/s, and red temperature is 677 DEG C.
The manufacturing method of the preceding high silicon content 440MPa grade low-temp ductile structure steel plate, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.012%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.002%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1233 DEG C, heating time 225min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1027 DEG C；Second stage start rolling temperature
It is 940 DEG C, finishing temperature is 807 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 5 DEG C/s, and red temperature is 666 DEG C.
The manufacturing method of the preceding high silicon content 440MPa grade low-temp ductile structure steel plate, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.010%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.003%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1229 DEG C, heating time 272min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1022 DEG C；Second stage start rolling temperature
It is 890 DEG C, finishing temperature is 816 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 7 DEG C/s, and red temperature is 645 DEG C.
The beneficial effects of the present invention are:
(1) reach 19281 standard of GOST using technologies, performances such as high-temperature heating, controlled rollings in the present invention in the present invention and want
It asks, steel plate low temperature impact properties are excellent, meet the requirements such as low temperature military service, the easy welding under severe cold environment, comprehensive mechanical property
Energy index reaches external similar level；
(2) heating period takes high-temperature heating in the present invention, guarantees that slab homogeneous heating, surface suicide are fully oxidized；
(3) for steel plate maximum gauge of the present invention up to 50mm, intensity meets the requirement of 440MPa rank, and impact meets -20 DEG C~-70
DEG C KCU or -20 DEG C~-40 DEG C KCV impacts and the impact of 10% strain-aging, especially -70 DEG C of KCU impact flexibility >=
120J/cm2, 10% strains impact >=150J/cm after+250 DEG C of timeliness2；
(4) economy of 440MPa rank low-temperature flexibility structural steel and iron can be achieved in the present invention, produce in batches, the huge market demand,
It is good in economic efficiency.
Specific embodiment
Embodiment 1
A kind of high silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method, steel plate thickness provided in this embodiment are
10mm, chemical component and mass percent are as follows: C:0.09%, Mn:1.48%, Si:0.62%, P:0.013%, S:
0.002%, Nb:0.025%, V:0.033%, Ti:0.012%, Alt:0.033%, CEV:0.38%, surplus are Fe and miscellaneous
Matter.
Manufacturing method the following steps are included:
S1, steel-making: converter deep dephosphorization, molten steel P:0.013%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.002%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1239 DEG C, heating time 244min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1038 DEG C；Second stage start rolling temperature
It is 960 DEG C, finishing temperature is 831 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 4 DEG C/s, and red temperature is 677 DEG C.
Embodiment 2
A kind of high silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method, steel plate thickness provided in this embodiment are
12mm, chemical component and mass percent are as follows: C:0.11%, Mn:1.53%, Si:0.55%, P:0.012%, S:
0.002%, Nb:0.028%, V:0.037%, Ti:0.015%, Alt:0.041%, CEV:0.40%, surplus are Fe and miscellaneous
Matter.
Manufacturing method the following steps are included:
S1, steel-making: converter deep dephosphorization, molten steel P:0.012%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.002%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1233 DEG C, heating time 225min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1027 DEG C；Second stage start rolling temperature
It is 940 DEG C, finishing temperature is 807 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 5 DEG C/s, and red temperature is 666 DEG C.
Embodiment 3
A kind of high silicon content 440MPa grade low-temp ductile structure steel plate and manufacturing method, steel plate thickness provided in this embodiment are
50mm, chemical component and mass percent are as follows: C:0.10%, Mn:1.55%, Si:0.60%, P:0.010%, S:
0.003%, Nb:0.032%, V:0.036%, Ti:0.014%, Alt:0.034%, CEV:0.40%, surplus are Fe and miscellaneous
Matter.
Manufacturing method, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.010%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.003%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1229 DEG C, heating time 272min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1022 DEG C；Second stage start rolling temperature
It is 890 DEG C, finishing temperature is 816 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 7 DEG C/s, and red temperature is 645 DEG C.
The mechanical property of 440MPa rank 09G2S steel plate see the table below in 1~embodiment of embodiment 3:
The present invention on the basis of Si content 0.50%~0.80%, using low-carbon ingredient design, be added lower content Nb, V,
Ti microalloying does not add the expensive alloying elements such as Ni, and ingredient design is simple, cost of alloy is low；Using high-temperature heating, control
Technologies, the 440Mpa rank low-temperature flexibility structural steel and iron developed, the maximum gauges such as rolling reach GOST up to 50mm, performance
19281 standard requirements, steel plate low temperature impact properties are excellent, particularly -70 DEG C of KCU impact flexibility >=120J/cm2, 10% strain
>=150 J/cm are impacted after+250 DEG C of timeliness2.Economy, the batch production of steel plate can be achieved, market demand is very big, economic benefit
It is good, it is contemplated that 1200 yuan/ton of benefit of ton steel wool or more；Meet the low temperature military service under the severe cold environments such as Russia, the easily use such as welding is wanted
It asks, comprehensive mechanical property index reaches external similar level, accelerates Energy restructuring to China, ensures that energy security also has
There is significant meaning.
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 (9)
1. a kind of high silicon content 440MPa grade low-temp ductile structure steel plate, which is characterized in that its chemical component and mass percent
It is as follows: C:0.08%~0.12%, Mn:1.40%~1.60%, Si:0.50%~0.80%, P≤0.020%, S≤0.005%, Nb:
0.020%~0.035%, V≤0.040%, Ti≤0.020%, Alt:0.020%~0.050%, N≤0.006%, CEV≤0.42%,
Surplus is Fe and impurity, wherein CEV=C+Mn/6+Si/24+Cr/5+Ni/40+Cu/13+V/14+P/2.
2. high silicon content 440MPa grade low-temp ductile structure steel plate according to claim 1, which is characterized in that steel plate thickness
For 6mm~50mm.
3. the other low-temperature flexibility structural steel and iron of high silicon content 440MPa according to claim 2, which is characterized in that steel plate thickness
For 10mm, chemical component and mass percent are as follows: C:0.09%, Mn:1.48%, Si:0.62%, P:0.013%, S:
0.002%, Nb:0.025%, V:0.033%, Ti:0.012%, Alt:0.033%, CEV:0.38%, surplus are Fe and impurity.
4. high silicon content 440MPa grade low-temp ductile structure steel plate according to claim 2, which is characterized in that steel plate thickness
For 12mm, chemical component and mass percent are as follows: C:0.11%, Mn:1.53%, Si:0.55%, P:0.012%, S:
0.002%, Nb:0.028%, V:0.037%, Ti:0.015%, Alt:0.041%, CEV:0.40%, surplus are Fe and impurity.
5. high silicon content 440MPa grade low-temp ductile structure steel plate according to claim 2, which is characterized in that steel plate thickness
For 50mm, chemical component and mass percent are as follows: C:0.10%, Mn:1.55%, Si:0.60%, P:0.010%, S:
0.003%, Nb:0.032%, V:0.036%, Ti:0.014%, Alt:0.034%, CEV:0.40%, surplus are Fe and impurity.
6. a kind of manufacturing method of high silicon content 440MPa grade low-temp ductile structure steel plate, which comprises the following steps:
S1, steel-making: use converter deep dephosphorization, molten steel P≤0.020%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization, molten steel S≤
0.005%, slab is prepared in continuous casting；
S2, heating: heating temperature is 1220 DEG C~1250 DEG C, and heating time is 150min~300min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1000 DEG C~1050 DEG C；Second stage
Start rolling temperature is 890 DEG C~960 DEG C, and finishing temperature is 800 DEG C~850 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 4 DEG C/s~8 DEG C/s, and red temperature is 640 DEG C~680
℃。
7. the manufacturing method of high silicon content 440MPa grade low-temp ductile structure steel plate according to claim 6, feature exist
In, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.013%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.002%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1239 DEG C, heating time 244min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1038 DEG C；Second stage start rolling temperature
It is 960 DEG C, finishing temperature is 831 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 4 DEG C/s, and red temperature is 677 DEG C.
8. the manufacturing method of high silicon content 440MPa grade low-temp ductile structure steel plate according to claim 6, feature exist
In, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.012%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.002%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1233 DEG C, heating time 225min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1027 DEG C；Second stage start rolling temperature
It is 940 DEG C, finishing temperature is 807 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 5 DEG C/s, and red temperature is 666 DEG C.
9. the manufacturing method of high silicon content 440MPa grade low-temp ductile structure steel plate according to claim 6, feature exist
In, comprising the following steps:
S1, steel-making: converter deep dephosphorization, molten steel P:0.010%, molten iron pretreatment desulfurizing and LF furnace depth desulfurization are used, molten steel S:
0.003%, slab, slab thickness 220mm is prepared in continuous casting；
S2, heating: heating temperature is 1229 DEG C, heating time 272min；
S3, rolling: using two-stage controlled rolling process, and first stage roughing finishing temperature is 1022 DEG C；Second stage start rolling temperature
It is 890 DEG C, finishing temperature is 816 DEG C；
S4, cooling: the steel plate after rolling is cooled down, and cooling velocity is 7 DEG C/s, and red temperature is 645 DEG C.
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Cited By (2)
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| WO2021012512A1 (en) * | 2019-07-25 | 2021-01-28 | 南京钢铁股份有限公司 | S420nl-z35 low-temperature-toughness steel plate with high strength and manufacturing method therefor |
| CN112680672A (en) * | 2021-01-04 | 2021-04-20 | 南京钢铁股份有限公司 | High-toughness high-aging-resistance impact steel plate and manufacturing method thereof |
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Application publication date: 20190212 |