CN109852893A - A kind of low-temperature high-toughness refractory steel and preparation method thereof - Google Patents
A kind of low-temperature high-toughness refractory steel and preparation method thereof Download PDFInfo
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Abstract
A kind of low-temperature high-toughness refractory steel of the invention, chemical composition and its weight percent are C:0.01~0.12%, Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%, Cu:0.02-0.05%, Cr:0.10-0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-0.080%, Ni:0.05-0.30%, B≤0.0040%, P≤0.025%, S≤0.0020%, surplus are Fe and inevitable impurity.The present invention is by adding one or more of microalloy elements, under certain proportion, it is made to obtain good fire resistance and low-temperature flexibility.Yield strength of the steel at 600 DEG C is greater than 2/3, -40 DEG C of ballistic work >=120J of its room temperature standard requirements yield strength, and there is excellent forming property, cold-bending property, welding performance etc..
Description
Technical field
The invention belongs to technical field of steel rolling, it is related to a kind of low-temperature high-toughness refractory steel and preparation method thereof.
Background technique
Common building structural steel yield strength at 600 DEG C will drop to the 1/2 of room-temperature yield strength hereinafter, to
Lose bearing capacity.Existing building standard regulation protects steel construction with fireproof heat-insulating coating.However spray refractory heat insulating coating
Work endangers the health of worker, extends the duration, increases steel construction construction cost.In addition, fireproof heat-insulating coating spraying operation
Splash also create environmental pollution.
Minimum reachable -20 DEG C of northern China winter temperature, reachable -40 DEG C of some areas, steel construction for building is in severe cold
Weather under impact flexibility can drastically reduce, especially under extremely cold weather conditions, steel construction is in certain impact loading
It is lower to be easy to be broken suddenly, so as to cause serious accident.In order to adapt to the weather conditions of northern cold, enhancing high level is built
The safety built needs a kind of refractory steel of low-temperature high-toughness, at high temperature intensity with higher, while having at low temperature
Good impact flexibility.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of low-temperature high-toughness refractory steel and its preparation sides
Method has preferable fire resistance and low-temperature flexibility.
The present invention provides a kind of low-temperature high-toughness refractory steel, chemical composition and its weight percent be C:0.01~
0.12%, Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%, Cu:0.02-0.05%, Cr:
0.10-0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-0.080%, Ni:0.05-0.30%, B
≤ 0.0040%, P≤0.025%, S≤0.0020%, surplus are Fe and inevitable impurity.
In a kind of preparation method of low-temperature high-toughness refractory steel of the invention, include the following steps:
Steel making working procedure: it smelted according to following chemical composition and its weight percent, pour into slab:
Wherein C:0.01~0.12%, Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%,
Cu:0.02-0.05%, Cr:0.10-0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-
0.080%, Ni:0.05-0.30%, B≤0.0040%, P≤0.025%, S≤0.0020%, surplus is for Fe and unavoidably
Impurity；
Heating process: control heating furnace oven cavity atmosphere reduces the generation of slab iron scale, guarantees that heating temperature is uniform,
Slab tapping temperature is 1160~1200 DEG C；
Rolling process: roughing passage selects 3+3 scheme control, and finishing temperature is greater than or equal to 800 DEG C；
Cooling process: using intermittent refrigerating mode, and steel plate begins to water spray in finishing mill out and carries out section cooling, spray
Water halves；
Coiling process: coiling temperature is greater than or equal to 400 DEG C.
In a kind of preparation method of low-temperature high-toughness refractory steel of the invention, in the steel making working procedure, raw material is using essence
Expect steel scrap, when pretreatment of raw material enters furnace, S≤0.005%.
In a kind of preparation method of low-temperature high-toughness refractory steel of the invention, converter smelting is carried out in the steel making working procedure
When converter carbonization treatment when only carry out an oxygen blast；Tapping uses low-carbon low-phosphor manganese iron, ferrosilicon, molybdenum-iron, high-chromium alloy；Converter
It is purged when toppling over molten steel to ladle using argon gas, ladle aluminium content is 0.005~0.015%；It is required that ladle N≤25ppm, pushing off the slag
Tapping, strict control enter the quantity of slag in ladle.
In a kind of preparation method of low-temperature high-toughness refractory steel of the invention, external refining is carried out in the steel making working procedure
Shi Yaoqiu LF treatment process keeps micro-positive pressure, and strict control LF increases N, it is desirable that increases N amount and is less than or equal to 10ppm；LF is using activity
Lime, fluorite make the reducing slag of good fluidity, control Argon intensity, avoid molten steel exposed；Calcareous processing is carried out after RH processing, is increased
Add the soft blow time, controls inclusion content in melting steel.
It is carried out in a kind of preparation method of low-temperature high-toughness refractory steel of the invention, in the steel making working procedure full when continuous casting
Cheng Jinhang molding casting is opened using wrapping in argon gas purging before pouring, and casting process accomplishes that no molten steel is exposed, and N is inhaled at the strict control mouth of a river,
Control increases N≤5ppm；Using the middle cinder inclusion of high alkalinity, so as to the removal of steel inclusion；Pouring molten steel process uses " soft pressure
Under " function, ensure Inner Quality of Billet；Steel pouring process keeps permanent pulling rate；Middle packet is controlled by the degree of superheat≤30 DEG C；Continuous casting billet casting
After the completion, it carries out stacking slow cooling cooling, guarantees slab slow cooling, rolled again after 72 hours.
A kind of low-temperature high-toughness refractory steel of the invention and preparation method thereof the utility model has the advantages that
(1) in ingredient design, compared to the other refractory steel of ad eundem, using low C, without the design of V, and suitable Cr, Mo,
Ni, Cu alloying element, indices reach requirement in mechanical property, and especially impact flexibility is particularly excellent.Do not adding V element
Under the premise of still obtain good fire resistance, product competitiveness is higher, have good economic benefit.
(2) yield strength of the low-temperature high-toughness refractory steel at 600 DEG C is greater than the 2/ of its room temperature standard requirements yield strength
3, meet the index request of modern building fabric steel fire safety.
(3) the low-temperature high-toughness refractory steel produced by this technique, compared to the other general structural steel of ad eundem, in addition to normal
Warm mechanical property meets indices requirement, and every mechanical property meets index and reaches requirement, and low-temperature high-toughness refractory steel is 600
DEG C when yield strength be greater than its room temperature standard requirements yield strength 2/3, meet modern building fabric steel fire safety
Index request, especially impact flexibility are particularly excellent, and ballistic work in kind can achieve >=200J at -40 DEG C.
Specific embodiment
Common building structural steel has good intensity at room temperature, but as the temperature rises, and the surrender of steel is strong
Degree will drop to the 1/2 of room-temperature yield strength hereinafter, to lose bearing capacity.The standard for generalling use Japan in the world is come
Determine the fire resistance of steel: if yield strength of the steel at 600 DEG C is greater than the 2/3 of its room-temperature yield strength, steel just has
Fire resistance.Refractory steel of the invention has preferable by the way that the alloying elements such as Mo, Cr, Cu, Ni are added in steel obtained from
Fire resistance.
The impact energy of common building structural steel is required in >=27J, and ductile-brittle transition temperature is at -20 DEG C, such material
In the environment of temperature is lower than -20 DEG C, brittle fracture easily occurs under the action of shock loading.Low-temperature high-toughness of the invention is resistance to
Fiery steel implements control cooling velocity to it in process by the way that Nb micro alloying element is added in steel to make crystal grain
Structure refinement, final products material object have good low-temperature flexibility in -40 DEG C of ballistic work >=200J.
Low-temperature high-toughness refractory steel will obtain good fire resistance and low-temperature flexibility, must be requested that molten steel has good
Degree of purity and lower C content, and design special alloy addition.
A kind of low-temperature high-toughness refractory steel of the invention, chemical composition and its weight percent are C:0.01~0.12%,
Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%, Cu:0.02-0.05%, Cr:0.10-
0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-0.080%, Ni:0.05-0.30%, B≤
0.0040%, P≤0.025%, S≤0.0020%, surplus are Fe and inevitable impurity.
A kind of low-temperature high-toughness refractory steel of the invention is made under certain proportion by adding several microalloy elements
It obtains good fire resistance and low-temperature flexibility.Yield strength of the refractory steel at 600 DEG C is greater than its room temperature standard requirements
The 2/3 of yield strength, -40 DEG C of ballistic work >=120J, and there is excellent forming property, cold-bending property, welding performance etc..
The refractory mechanism of steel: the Mo element added in refractory steel can significantly increase overcooling austenite in perlitic transformation
The stability in area, to be conducive to the formation of bainite or MA tissue.So refractory steel has obtained ferrite under lower cooling rate
The phase boundary of the line and staff control of+bainite+MA, this line and staff control can effectively hinder dislocation motion, to improve steel
Elevated temperature strength.
Molybdenum and niobium are all carbides.Mo advantageously forms more small stable carbide (Mo2C), this
Carbide is compared with Fe3C is more stable, at high operating temperatures, it is difficult to decompose and grow up.Niobium forms tiny the second phase of NbC in steel, tool
There is very high structure stability.Small and dispersed Nb (C, N), can hinder crystal boundary migration, improve crystal grain and grow up temperature, reach fine grain
The crystal grain of effect, refinement can effectively prevent the extension of crackle, to improve the low-temperature flexibility of refractory steel.
After the microelements such as copper, chromium, nickel are added in steel, steel surface is made to form the fine and close and very strong protective film of adhesion,
It hinders corrosion to spread and develop inward, the matrix below rusty scale is protected, to slow down its corrosion rate.The shape between rusty scale and matrix
At the amorphous state spinel oxides compacted zone of about 50 μm~100 μ m-thicks, this layer of dense oxide film prevents external environment empty
Oxygen and water are penetrated into steel substrate in gas, are slowed down corrosion and are developed in depth and breadth to steel material, improve the corrosion-resistant energy of steel material
Power.
A kind of preparation method of low-temperature high-toughness refractory steel of the invention, includes the following steps:
Steel making working procedure: it smelted according to following chemical composition and its weight percent, pour and build up slab:
Wherein C:0.01~0.12%, Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%,
Cu:0.02-0.05%, Cr:0.10-0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-
0.080%, Ni:0.05-0.30%, B≤0.0040%, P≤0.025%, S≤0.0020%, surplus is for Fe and unavoidably
Impurity；
Heating process: control heating furnace oven cavity atmosphere reduces the generation of slab iron scale, guarantees that heating temperature is uniform,
Slab tapping temperature is 1160~1200 DEG C；
Rolling process: roughing passage selects 3+3 scheme control, and finishing temperature is greater than or equal to 800 DEG C；
Cooling process: using intermittent refrigerating mode, and steel plate begins to water spray in finishing mill out and carries out section cooling, spray
Water halves；
Coiling process: coiling temperature is greater than or equal to 400 DEG C.
When it is implemented, raw material uses fine fodder steel scrap in the steel making working procedure, when pretreatment of raw material enters furnace, S≤
0.005%.
When it is implemented, only carrying out an oxygen blast when converter carbonization treatment when carrying out converter smelting in the steel making working procedure；
Tapping uses low-carbon low-phosphor manganese iron, ferrosilicon, molybdenum-iron, high-chromium alloy；It is purged when converter topples over molten steel to ladle using argon gas, steel
Alclad content is 0.005~0.015%；It is required that ladle N≤25ppm, slag-stopping tapping, strict control enter the quantity of slag in ladle.
When it is implemented, carrying out requiring LF treatment process to keep micro-positive pressure when external refining in the steel making working procedure, strictly
It controls LF and increases N, it is desirable that increase N amount and be less than or equal to 10ppm；LF makes the reducing slag of good fluidity, control using active lime, fluorite
Argon intensity avoids molten steel exposed；Calcareous processing is carried out after RH processing, increases the soft blow time, controls inclusion content in melting steel.
When it is implemented, whole process carries out molding casting when carrying out continuous casting in the steel making working procedure, opens and blown before pouring using argon gas
Middle packet is swept, casting process accomplishes that no molten steel is exposed, and N is inhaled at the strict control mouth of a river, and control increases N≤5ppm；Using the middle packet of high alkalinity
Slag, so as to the removal of steel inclusion；Pouring molten steel process uses " soft pressure " function, ensures Inner Quality of Billet；Pour steel mistake
Journey keeps permanent pulling rate；Middle packet is controlled by the degree of superheat≤30 DEG C；After continuous casting billet casting complete, carries out stacking slow cooling cooling, guarantee casting
Base slow cooling is rolled again after 72 hours.
Embodiment 1
It smelted according to following chemical composition and its weight percent, pour and build up slab
C:0.06%, Mn:0.8%, Si:0.12%, Al:0.030%, Cu:0.31%, Cr:0.32%, Mo:0.4%,
Ti:0.008%, Nb:0.03%, Ni:0.13%, B:0.0002%, P:0.01%, S:0.001%, surplus are Fe and can not keep away
The impurity exempted from；
Slab is passed sequentially through into heating process, rolling process, cooling process, coiling process again and obtains low-temperature high-toughness fire resisting
Steel.
Embodiment 2
It smelted according to following chemical composition and its weight percent, pour and build up slab
C:0.1%, Mn:1.4%, Si:0.28%, Al:0.025%, Cu:0.40%, Cr:0.55%, Mo:0.35%,
Ti:0.030%, Nb:0.01%, Ni:0.18%, B:0.0001%, P:0.012%, S:0.002%, surplus are Fe and can not
The impurity avoided；
Slab is passed sequentially through into heating process, rolling process, cooling process, coiling process again and obtains low-temperature high-toughness fire resisting
Steel.
1 refractory steel of table and ordinary construction steel mechanical property compare
The test of 2 refractory steel series impact of table
As it can be seen from table 1 the fire resistance test steel of embodiment 1 and the fire resistance test steel high-temperature behavior of embodiment 2 are all satisfied
High-temperature flame-proof performance requirement, reaching steel can be with the design object of fire resisting.Since the alloy amount that the steel of embodiment 1 adds is more,
The intensity of steel is higher than the strength character of steel in embodiment 2 in embodiment 1, and in contrast to the common hot-rolled structural steel of Q345B, implements
Steel is tested in example 1 and embodiment 2 and all has better impact flexibility, from table 2 it can be seen that testing in embodiment 1 and embodiment 2
Steel still has good impact flexibility at -60 DEG C, illustrates that refractory steel of the invention is still not up to ductile-brittle transition temperature at -60 DEG C
Point meets the use condition of northern area low temperature military service.
The foregoing is merely presently preferred embodiments of the present invention, the thought being not intended to limit the invention, all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of low-temperature high-toughness refractory steel, which is characterized in that chemical composition and its weight percent are C:0.01~0.12%,
Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%, Cu:0.02-0.05%, Cr:0.10-
0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-0.080%, Ni:0.05-0.30%, B≤
0.0040%, P≤0.025%, S≤0.0020%, surplus are Fe and inevitable impurity.
2. a kind of preparation method of low-temperature high-toughness refractory steel, which comprises the steps of:
Steel making working procedure: it smelted according to following chemical composition and its weight percent, pour into slab:
Wherein C:0.01~0.12%, Mn:0.30~1.60%, Si:0.10-0.50%, Al:0.010-0.050%, Cu:
0.02-0.05%, Cr:0.10-0.90%, Mo:0.10-0.80%, Ti:0.005-0.060%, Nb:0.005-0.080%,
Ni:0.05-0.30%, B≤0.0040%, P≤0.025%, S≤0.0020%, surplus are Fe and inevitable impurity；
Heating process: control heating furnace oven cavity atmosphere reduces the generation of slab iron scale, guarantees that heating temperature is uniform, slab
Tapping temperature is 1160~1200 DEG C；
Rolling process: roughing passage selects 3+3 scheme control, and finishing temperature is greater than or equal to 800 DEG C；
Cooling process: using intermittent refrigerating mode, and steel plate begins to water spray in finishing mill out and carries out section cooling, amount of water sprayed
Halve；
Coiling process: coiling temperature is greater than or equal to 400 DEG C.
3. the preparation method of low-temperature high-toughness refractory steel as claimed in claim 2, which is characterized in that in the steel making working procedure,
Raw material uses fine fodder steel scrap, when pretreatment of raw material enters furnace, S≤0.005%.
4. the preparation method of low-temperature high-toughness refractory steel as claimed in claim 2, which is characterized in that in the steel making working procedure into
An oxygen blast is only carried out when row converter smelting when converter carbonization treatment；Tapping uses low-carbon low-phosphor manganese iron, ferrosilicon, molybdenum-iron, Gao Ge
Alloying；It is purged when converter topples over molten steel to ladle using argon gas, ladle aluminium content is 0.005~0.015%；It is required that ladle N
≤ 25ppm, slag-stopping tapping, strict control enter the quantity of slag in ladle.
5. the preparation method of low-temperature high-toughness refractory steel as claimed in claim 2, which is characterized in that in the steel making working procedure into
LF treatment process is required to keep micro-positive pressure when row external refining, strict control LF increases N, it is desirable that increase N amount and be less than or equal to 10ppm；
LF makes the reducing slag of good fluidity using active lime, fluorite, controls Argon intensity, avoids molten steel exposed；It is carried out after RH processing
Calcareous processing increases the soft blow time, controls inclusion content in melting steel.
6. the preparation method of low-temperature high-toughness refractory steel as claimed in claim 2, which is characterized in that in the steel making working procedure into
Whole process carries out molding casting when row continuous casting, opens using wrapping in argon gas purging before pouring, casting process accomplishes that no molten steel is exposed, stringent to control
N is inhaled at the mouth of a river processed, and control increases N≤5ppm；Using the middle cinder inclusion of high alkalinity, so as to the removal of steel inclusion；Pouring molten steel process
Using " soft pressure " function, Inner Quality of Billet is ensured；Steel pouring process keeps permanent pulling rate；Middle packet is controlled by the degree of superheat≤30 DEG C；
After continuous casting billet casting complete, carries out stacking slow cooling cooling, guarantee slab slow cooling, rolled again after 72 hours.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724878A (en) * | 2019-10-30 | 2020-01-24 | 鞍钢股份有限公司 | 0.5Ni low-temperature steel and manufacturing method thereof |
| CN111101068A (en) * | 2020-02-17 | 2020-05-05 | 本钢板材股份有限公司 | Low-nickel-content atmospheric corrosion resistant steel and preparation method thereof |
| CN111621688A (en) * | 2020-03-24 | 2020-09-04 | 本钢板材股份有限公司 | Novel steel special for steel structure and preparation method thereof |
| CN111647822A (en) * | 2020-03-24 | 2020-09-11 | 本钢板材股份有限公司 | Steel applied to environment-friendly kitchen and preparation method thereof |
| CN111793776A (en) * | 2020-03-31 | 2020-10-20 | 本钢板材股份有限公司 | Acid corrosion resistant X65MS pipeline steel hot-rolled coil and preparation method thereof |
| CN117165872A (en) * | 2023-11-02 | 2023-12-05 | 北京科技大学 | Single titanium microalloyed corrosion-resistant high-strength steel with high hole expansion rate |
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| JPH06316724A (en) * | 1993-03-04 | 1994-11-15 | Kobe Steel Ltd | Production of refractory steel plate for construction use, low in acoustic anisotropy |
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| JPH06316724A (en) * | 1993-03-04 | 1994-11-15 | Kobe Steel Ltd | Production of refractory steel plate for construction use, low in acoustic anisotropy |
| CN101285153A (en) * | 2008-05-09 | 2008-10-15 | 攀钢集团成都钢铁有限责任公司 | Fire-resistant steel fire-resistant seamless steel pipe and production method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724878A (en) * | 2019-10-30 | 2020-01-24 | 鞍钢股份有限公司 | 0.5Ni low-temperature steel and manufacturing method thereof |
| CN111101068A (en) * | 2020-02-17 | 2020-05-05 | 本钢板材股份有限公司 | Low-nickel-content atmospheric corrosion resistant steel and preparation method thereof |
| CN111621688A (en) * | 2020-03-24 | 2020-09-04 | 本钢板材股份有限公司 | Novel steel special for steel structure and preparation method thereof |
| CN111647822A (en) * | 2020-03-24 | 2020-09-11 | 本钢板材股份有限公司 | Steel applied to environment-friendly kitchen and preparation method thereof |
| CN111793776A (en) * | 2020-03-31 | 2020-10-20 | 本钢板材股份有限公司 | Acid corrosion resistant X65MS pipeline steel hot-rolled coil and preparation method thereof |
| CN117165872A (en) * | 2023-11-02 | 2023-12-05 | 北京科技大学 | Single titanium microalloyed corrosion-resistant high-strength steel with high hole expansion rate |
| CN117165872B (en) * | 2023-11-02 | 2024-02-13 | 北京科技大学 | Single titanium microalloyed corrosion-resistant high-strength steel with high hole expansion rate |
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