CN104099517A - Production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance - Google Patents
Production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance Download PDFInfo
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- CN104099517A CN104099517A CN201410335926.6A CN201410335926A CN104099517A CN 104099517 A CN104099517 A CN 104099517A CN 201410335926 A CN201410335926 A CN 201410335926A CN 104099517 A CN104099517 A CN 104099517A
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Abstract
The invention discloses a production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance. The steel comprises the following chemical components in percentage by mass: C not more than 0.03%, Si not more than 0.1%, Mn not more than 1%, 0.02-0.06% of Al, P not more than 0.01%, S not more than 0.004%, N not more than 0.004%, 0.01-0.08% of Ti, Nb not more than 0.05%, and the balance of Fe and inevitable impurities. Through a serial of processes of refining, continuous rolling, heating, rough milling, electromagnetic inductive heating, fine milling, laminar cooling and winding, the yielding strength of the steel having 225 MPa stage of low yield point and used for building earthquake resistance reaches 200-240 MPa stage, and the elongation is greater than 50%; and the steel has excellent plastic deformation and impact toughness, and has the advantages of lower alloy cost, easy process realization, excellent weldability and excellent low-cycle fatigue performance.
Description
Technical field
The application relates to steel production technical field, relates in particular to the manufacture method of a kind of 225MPa rank low-yield building aseismicity steel.
Background technology
Low-yield building aseismicity is mainly used in building deoscillator with steel, can effectively protect major bearing structures, reduces the destruction of vibration to building.These antishock devices bear earthquake load effect prior to body junction member, first surrender, and lag behind and absorb seismic energy, the safety of protection major structure of construction by repeated load.Compared with other power consumption material, have and change the advantages such as convenient and reliability is strong after simple structure, economy and durability, shake, both can be used for the antidetonation of new building, also can be used for the raising of old building aseismicity ability.
Low Yield Point Steel comes from the building aseismicity deoscillator steel of the exploitation nineties in last century, through the development of decades, has now formed 100MPa, 160MPa, the trade mark of tri-ranks of 225MPa, the feature of its significant parameter index, low surrender, low tension, high-elongation, high 0 DEG C of impelling strength, low yield strength ratio, anti-low cycle fatigue, low work hardening rate, and yield-point fluctuation range is very narrow.The chemical composition of original 225MPa rank is mainly with low C, Si, and the Composition Design of Mn, strictly controls N, S, P impurity element, then adds and plant alloying element as Nb, V, Ti, B etc., through hot rolling reeling, then obtains through normalizing heat treatment technique.This technique not only cost of alloy is higher, and must, through Overheating Treatment, increase process costs.
Summary of the invention
The present invention the manufacture method of a kind of 225MPa rank low-yield building aseismicity steel is provided, to solve the higher technical problem of existing steel production technique cost.
In actual applications, these key propertys of low cycle fatigue, impelling strength and unit elongation all have substantial connection with inclusion size and number.The technological improvement that Control and Inclusion Removal is carried out has: reduce impurity element, reduce the amount of inclusions; Reduce slab heating temperature, reduce the formation of fine foreign matter; High temperature coiling, alligatoring has inclusion.The present invention is intended to reduce alloy content, not thermal treatment postmenstruation, and aspect Control and Inclusion Removal, application electromagnetic induction heating technology solves technique contradiction, obtains the low surrender construction(al)steel of the qualified 225MPa rank of stable performance.
In concrete application, the manufacture method that the invention provides a kind of 225MPa rank low-yield building aseismicity steel, its chemical composition is by mass percentage: C :≤0.03%, Si :≤0.1%, Mn :≤1%, Al:0.02%～0.06%, P :≤0.01%, S :≤0.004%, N :≤0.004%, Ti:0.01%～0.08%, Nb≤0.05%, all the other are Fe and inevitable impurity; Described 225MPa level low-yield building aseismicity comprises with the technical process of steel: molten steel by refining after, continuous casting obtain slab; Described slab is heated; Carry out roughing; Pass through electromagnetic induction heating; Carry out finish rolling, to obtain hot-rolled sheet; Described hot-rolled sheet is carried out to laminar flow cooling; Described hot-rolled sheet is batched into hot rolled coil, and wherein, the rolling total deformation of described hot rolled coil is greater than 80%.
Preferably, described described slab is heated, be specially: by described heating of plate blank to 1100 DEG C～1150 DEG C.
Preferably, described by electromagnetic induction heating, be specially: by electromagnetic induction heating to 1050 DEG C～1100 DEG C.
Preferably, the start rolling temperature of described finish rolling is greater than 1000 DEG C.
Preferably, the finishing temperature of described finish rolling is 880 DEG C～950 DEG C.
Preferably, described coiling temperature is 680 DEG C～750 DEG C.
Preferably, described described hot-rolled sheet is batched into hot rolled coil after, described method also comprises: described hot rolled coil is sent into burial pit, to slowly cool to room temperature.
Explanation about composition and technique:
C solution strengthening, improves yield strength, reduces unit elongation; Be controlled at below 0.03%.
Si is deoxidant element, and solution strengthening in steel, is controlled at below 0.01%.
The solution strengthening element that Mn is conventional, improves yield strength, is controlled at below 1%.
P easily makes steel become fragile, and affects toughness, is controlled at below 0.01%.
S affects the low-temperature flexibility of steel, is controlled at below 0.004%.
The N of N solid solution can improve intensity, is controlled at below 0.004%.
The element that must use of Al deoxidation, can form AlN simultaneously and be mingled with, and improves intensity, is controlled at 0.01%-0.06%.
Ti is easily combined with C, N, forms the non-metallic inclusion of Ti (C, N), and appropriate Ti can reduce the C of unbound state, N atom, thus reduce intensity.Add very little, do not have the effect of solid C, N, add too much easily dispersion-strengthened, improve intensity.So be controlled at 0.01%-0.08%.The alligatoring of inclusion simultaneously can effectively reduce its pinning effect to crystal boundary, reduces intensity, improves unit elongation.
Nb has solid C, N effect, and appropriate interpolation can form evenly thick Nb (C, N), to reduce its impact on yield strength, adds too much, and strengthening effect is obvious.Add scope control below 0.03%.
By one or more technical scheme of the present invention, beneficial effect of the present invention is as follows:
The invention provides the manufacture method of a kind of 225MPa rank low-yield building aseismicity steel, the chemical composition of the steel relating to is by mass percentage: C :≤0.03%, Si :≤0.1%, Mn :≤1%, Al:0.02%～0.06%, P :≤0.01%, S :≤0.004%, N :≤0.004%, Ti:0.01%～0.08%, Nb≤0.05%, all the other are Fe and inevitable impurity.Cooling by refining, continuous casting, heating, roughing, electromagnetic induction heating, finish rolling, laminar flow, the series of process such as batch, make the yield strength of 225MPa level low-yield building aseismicity steel reach 200MPa-240MPa level, unit elongation >50%, has good viscous deformation and impelling strength; Cost of alloy is lower simultaneously, and technique easily realizes, and welding property and low cycle fatigue property are good.
In addition, the electromagnetic induction heating technique that the present invention adopts, can improve temperature within a short period of time, impact on rhythm of production is less, well solved low temperature heating of plate blank and the high-temperature final rolling contradiction between batching, and these two aspects are all conducive to inclusion alligatoring, ferrite is grown up, thereby reduction intensity, improves unit elongation.
Brief description of the drawings
The 2250MPa level low-yield building aseismicity that Fig. 1 provides for the embodiment of the present invention process flow sheet of steel.
Embodiment
In order to make the application the technical staff in the technical field more clearly understand the application, below in conjunction with accompanying drawing, by specific embodiment, present techniques scheme is described in detail.
Embodiment 1:
The manufacture method of steel for the 225MPa level low-yield building aseismicity the present invention relates to, the chemical composition of the steel relating to is by mass percentage:
C :≤0.03%, Si :≤0.1%, Mn :≤1%, Al:0.02%～0.06%, P :≤0.01%, S :≤0.004%, N :≤0.004%, Ti:0.01%～0.08%, Nb≤0.05%, all the other are Fe and inevitable impurity.
Preferably, please refer to Fig. 1 below, described 225MPa level low-yield building aseismicity comprises with the technical process (being manufacture method) of steel:
S101, molten steel by refining after continuous casting obtain slab.
S102, heats described slab.
Preferably, described described slab is heated, be specially: by described heating of plate blank to 1100 DEG C～1150 DEG C.
S103, carries out roughing.
S104, passes through electromagnetic induction heating.
Preferably, described by electromagnetic induction heating, be specially: by electromagnetic induction heating to 1050 DEG C～1100 DEG C.
S105, carries out finish rolling, to obtain hot-rolled sheet.
Preferably, the start rolling temperature of described finish rolling is greater than 1000 DEG C.
Preferably, the finishing temperature of described finish rolling is 880 DEG C～950 DEG C.S106, carries out laminar flow by described hot-rolled sheet cooling.
S107, batches into hot rolled coil by described hot-rolled sheet.Wherein, the rolling total deformation of described hot rolled coil is greater than 80%.
Preferably, described coiling temperature is 680 DEG C～750 DEG C.
Preferably, described described hot-rolled sheet is batched into hot rolled coil after, described method also comprises: described hot rolled coil is sent into burial pit, to slowly cool to room temperature.
In actual applications, according to the chemical composition difference of the slab obtaining after continuous casting (that is: continuously cast bloom), having different manufacture crafts, please refer to table 1 below, is the main chemical compositions table (%) of continuously cast bloom.
Table 1
| Continuously cast bloom kind | C | Si | Mn | P | S | Als | N | Ti | Nb |
| A-1 | 0.015 | 0.008 | 0.37 | 0.007 | 0.0025 | 0.054 | 0.0028 | 0.013 | 0.023 |
| A-2 | 0.011 | 0.003 | 0.62 | 0.003 | 0.0032 | 0.035 | 0.0034 | 0.021 | 0.013 |
| A-3 | 0.013 | 0.004 | 0.85 | 0.005 | 0.0034 | 0.043 | 0.0024 | 0.015 | 0.03 |
According to the chemical composition of table 1, there is following implementation process:
The preparation process of A-1 is as follows:
(1) continuously cast bloom of A-1 is sent into process furnace heating, 1150 DEG C of Heating temperatures.
(2) after heating, carry out roughing, after roughing, be heated rapidly to 1080 DEG C through electromagnetism.
(3) carry out finish rolling, finish rolling start rolling temperature is 1010 DEG C, and finishing temperature is 880 DEG C.
(4) carry out laminar flow cooling.
(5) coil into hot rolled coil, coiling temperature is 680 DEG C, then puts into burial pit cool to room temperature, wherein, hot-rolled sheet total reduction >80%, the thickness of hot-rolled sheet is 6mm.
The preparation process of A-2 is as follows:
(1) continuously cast bloom of A-2 is sent into process furnace heating, 1130 DEG C of Heating temperatures.
(2) after heating, carry out roughing, after roughing, be heated rapidly to 1090 DEG C through electromagnetism.
(3) carry out finish rolling, finish rolling start rolling temperature is 1020 DEG C, and finishing temperature is 900 DEG C.
(4) carry out laminar flow cooling.
(5) coil into hot rolled coil, coiling temperature is 700 DEG C, then puts into burial pit cool to room temperature, wherein, hot-rolled sheet total reduction >80%, the thickness of hot-rolled sheet is 15mm.
The preparation process of A-3 is as follows:
(1) continuously cast bloom of A-3 is sent into process furnace heating, 1120 DEG C of Heating temperatures.
(2) after heating, carry out roughing, after roughing, be heated rapidly to 1060 DEG C through electromagnetism.
(3) carry out finish rolling, finish rolling start rolling temperature is 1040 DEG C, and finishing temperature is 930 DEG C.
(4) carry out laminar flow cooling.
(5) coil into hot rolled coil, coiling temperature is 730 DEG C, then puts into burial pit cool to room temperature, wherein, hot-rolled sheet total reduction >80%, the thickness of hot-rolled sheet is 20mm.
The finished product of above-mentioned three groups of continuously cast blooms is carried out to mechanical property measurement, in table 2, is the mechanical property table of the finished product of three groups of continuously cast blooms.
Table 2
By one or more embodiment of the present invention, beneficial effect of the present invention is as follows:
The invention provides the manufacture method of a kind of 225MPa rank low-yield building aseismicity steel, the chemical composition of the steel relating to is by mass percentage: C :≤0.03%, Si :≤0.1%, Mn :≤1%, Al:0.02%～0.06%, P :≤0.01%, S :≤0.004%, N :≤0.004%, Ti:0.01%～0.08%, Nb≤0.05%, all the other are Fe and inevitable impurity.Cooling by refining, continuous casting, heating, roughing, electromagnetic induction heating, finish rolling, laminar flow, the series of process such as batch, make the yield strength of 225MPa level low-yield building aseismicity steel reach 200MPa-240MPa level, unit elongation >50%, has good viscous deformation and impelling strength; Cost of alloy is lower simultaneously, and technique easily realizes, and welding property and low cycle fatigue property are good.
In addition, the electromagnetic induction heating technique that the present invention adopts, can improve temperature within a short period of time, impact on rhythm of production is less, well solved low temperature heating of plate blank and the high-temperature final rolling contradiction between batching, and these two aspects are all conducive to inclusion alligatoring, ferrite is grown up, thereby reduction intensity, improves unit elongation.
Although described the application's preferred embodiment, once one of ordinary skilled in the art obtains the basic creative concept of cicada, can make other change and amendment to these embodiment.So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various changes and modification and the spirit and scope that do not depart from the application to the application.Like this, if these amendments of the application and within modification belongs to the scope of the application's claim and equivalent technologies thereof, the application is also intended to comprise these changes and modification interior.
Claims (7)
1. the manufacture method of a 225MPa rank low-yield building aseismicity use steel, it is characterized in that, described 225MPa rank low-yield building aseismicity by the chemical composition of steel is by mass percentage: C :≤0.03%, Si :≤0.1%, Mn :≤1%, Al:0.02%～0.06%, P :≤0.01%, S :≤0.004%, N :≤0.004%, Ti:0.01%～0.08%, Nb≤0.05%, all the other are Fe and inevitable impurity;
Described 225MPa level low-yield building aseismicity comprises with the technical process of steel:
Molten steel by refining after, continuous casting obtain slab;
Described slab is heated;
Carry out roughing;
Pass through electromagnetic induction heating;
Carry out finish rolling, to obtain hot-rolled sheet;
Described hot-rolled sheet is carried out to laminar flow cooling;
Described hot-rolled sheet is batched into hot rolled coil, and wherein, the rolling total deformation of described hot rolled coil is greater than 80%.
2. the manufacture method of steel for 225MPa rank low-yield building aseismicity according to claim 1, is characterized in that,
Described described slab is heated, is specially:
By described heating of plate blank to 1100 DEG C～1150 DEG C.
3. the manufacture method of steel for 225MPa rank low-yield building aseismicity according to claim 1, is characterized in that,
Described by electromagnetic induction heating, be specially:
By electromagnetic induction heating to 1050 DEG C～1100 DEG C.
4. the manufacture method of steel for 225MPa rank low-yield building aseismicity according to claim 1, is characterized in that,
The start rolling temperature of described finish rolling is greater than 1000 DEG C.
5. the manufacture method with steel according to the 225MPa rank low-yield building aseismicity described in the arbitrary claim of claim 1 or 4, is characterized in that,
The finishing temperature of described finish rolling is 880 DEG C～950 DEG C.
6. the manufacture method of steel for 225MPa rank low-yield building aseismicity according to claim 1, is characterized in that,
Described coiling temperature is 680 DEG C～750 DEG C.
7. the manufacture method of steel for 225MPa rank low-yield building aseismicity according to claim 1, is characterized in that, described described hot-rolled sheet is batched into hot rolled coil after, described method also comprises:
Described hot rolled coil is sent into burial pit, to slowly cool to room temperature.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105420606A (en) * | 2015-12-14 | 2016-03-23 | 武汉钢铁(集团)公司 | High-strength and high-toughness hot rolled magnetic yoke steel with yield strength to be 550MPa grade and production method |
| CN106148831A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | Steel with ultralow yield point for seismic resistance and production method thereof |
| CN107574387A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 225MPa levels and strip production methods |
| CN107574296A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of inexpensive 225MPa levels low-yield point damper steel plate and strip production methods |
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| CN1477214A (en) * | 2003-07-08 | 2004-02-25 | 东北大学 | Production method of low yield strength ratio refactory hot continuously-rolled strip for building |
| CN101775536A (en) * | 2009-01-13 | 2010-07-14 | 宝山钢铁股份有限公司 | 225MPa earthquake-proof low yield strength steel and manufacturing method thereof |
| CN101781736A (en) * | 2010-03-09 | 2010-07-21 | 武汉钢铁(集团)公司 | Yield strength 225MPa-level earthquake-resistant construction steel and production method thereof |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1477214A (en) * | 2003-07-08 | 2004-02-25 | 东北大学 | Production method of low yield strength ratio refactory hot continuously-rolled strip for building |
| CN101775536A (en) * | 2009-01-13 | 2010-07-14 | 宝山钢铁股份有限公司 | 225MPa earthquake-proof low yield strength steel and manufacturing method thereof |
| CN101781736A (en) * | 2010-03-09 | 2010-07-21 | 武汉钢铁(集团)公司 | Yield strength 225MPa-level earthquake-resistant construction steel and production method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148831A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | Steel with ultralow yield point for seismic resistance and production method thereof |
| CN105420606A (en) * | 2015-12-14 | 2016-03-23 | 武汉钢铁(集团)公司 | High-strength and high-toughness hot rolled magnetic yoke steel with yield strength to be 550MPa grade and production method |
| CN107574387A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 225MPa levels and strip production methods |
| CN107574296A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of inexpensive 225MPa levels low-yield point damper steel plate and strip production methods |
| CN107574296B (en) * | 2017-09-23 | 2019-03-19 | 武钢集团昆明钢铁股份有限公司 | A kind of 225MPa grades of low-yield point damper steel plates of low cost and strip production methods |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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