CN108588559A - The cold rolling glassed steel of yield strength 230MPa or more - Google Patents
The cold rolling glassed steel of yield strength 230MPa or more Download PDFInfo
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- CN108588559A CN108588559A CN201810473249.2A CN201810473249A CN108588559A CN 108588559 A CN108588559 A CN 108588559A CN 201810473249 A CN201810473249 A CN 201810473249A CN 108588559 A CN108588559 A CN 108588559A
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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
- 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
- C21D1/26—Methods of annealing
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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
- C21D8/0236—Cold 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/04—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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention provides a kind of cold rolling glassed steel of yield strength 230MPa or more, the chemical component weight percentage of the cold rolling glassed steel is C：≤ 0.07Wt%, Si：≤ 0.03Wt%, Mn：0.25~0.50Wt%, P≤0.02Wt%, S≤0.02Wt%, Alt:0.015~0.035Wt%, N:0.005~0.010Wt%；The product that the present invention obtains has the high quick-fried sensibility TH values of anti-squama, and the water heater liner resistance to pulsating fatigue service life of making is up to 300,000 times or more.
Description
Technical field
The present invention relates to field of metallurgy, and in particular to especially a kind of for the cold rolling glassed steel that water heater liner makes
The cold rolling glassed steel of yield strength 230MPa or more.
Background technology
Water heater liner requires service life to reach 10 years or more, and pulsating fatigue experiment will be more than 260,000 times, through overheat
The design analysis of water heater liner manufacturing factory, the cold rolling glassed steel yield strength for making liner must reach 230MPa or more
It can meet the requirements.
Currently used for the cold rolling enamel Steel material that water heater liner makes, production method is：Blast-melted → converter refining
Steel → continuous casting → hot rolling → pickling cold continuous rolling → continuous annealing → finishing → finished product.This method is suitable for hot tandem and continuously
Annealing furnace unit.Its yield strength cannot meet the production requirement of water heater liner making in 180~210MPa.
In conclusion problems with exists in the prior art：Existing cold rolling glassed steel, yield strength is low, cannot meet
The production requirement that water heater liner makes.
Invention content
The present invention provides a kind of cold rolling glassed steel of yield strength 230MPa or more, to solve existing cold rolling glassed steel,
Yield strength is low, cannot meet water heater liner making production requirement the problem of.
For this purpose, the present invention proposes a kind of cold rolling glassed steel of yield strength 230MPa or more,
The chemical component weight percentage of the cold rolling glassed steel is C：≤ 0.07Wt%, Si：≤ 0.03Wt%, Mn：
0.25~0.50Wt%, P≤0.02Wt%, S≤0.02Wt%, Alt:0.015~0.035Wt%, N:0.005~
0.010Wt%；Surplus is Fe and inevitable trace element.
Further, the cold rolling glassed steel takes following steps to make successively：Blast-melted smelting, desulfurizing iron are located in advance
Reason, converter molten steel smelting, the processing of LF liquid steel refinings, sheet billet continuous casting, hot continuous rolling, pickling cold continuous rolling, cover annealing and smooth；Its
In, in the LF liquid steel refinings processing step：Molten steel carries out deoxidation and alloying processing in LF stoves, increases manganese using mid-carbon fe-mn,
It is added by 0.4-0.8kg/ tons and nitrogenizes silicon alloy, increase the precipitation of nitride.
Further, in the cover annealing step：Holding temperature of annealing is 640~680 DEG C, the rate of heat addition≤50
DEG C/h, 6~8h of soaking time, cooling rate≤20 DEG C/h is controlled, control is cooled to 380 DEG C, tapping temperature≤80 DEG C.
Further, in the planarization step：Using second formation technique, first time, smooth elongation percentage was set as 2.0
~3.0%, second of smooth elongation percentage is set as 2.0~2.5%.
Further, in the hot continuous rolling step：It is 1200~1250 DEG C to control slab heating temperature, to ensure strand
Within the stove inside holding time, so that micro alloying element is dissolved and control autstenitic grain size；Using seven rack continuous hot-rolling mills, finish to gauge
Temperature control is at 860~920 DEG C, 580~660 DEG C of coiling temperature.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.01Wt%, Si：0.022Wt%,
Mn：0.30Wt%, P：0.013Wt%, S：0.004Wt%, Alt:0.024Wt%, N:0.0054Wt%.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.03Wt%, Si：0.024Wt%,
Mn：0.28Wt%, P：0.015Wt%, S：0.006Wt%, Alt:0.030Wt%, N:0.0067Wt%.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.05Wt%, Si：0.015Wt%,
Mn：0.42Wt%, P：0.015Wt%, S：0.010Wt%, Alt:0.032Wt%, N:0.0062Wt%.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.035Wt%, Si：
0.018Wt%, Mn：0.36Wt%, P：0.013Wt%, S：0.008Wt%, Alt:0.028Wt%, N:0.0072Wt%.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.065Wt%, Si：
0.021Wt%, Mn：0.34Wt%, P：0.015Wt%, S：0.006Wt%, Alt:0.026Wt%, N:0.0085Wt%.
The present invention realizes that the steady production of the product, product have high anti-squama by ingredient and the optimization design of technique
Quick-fried sensibility TH values, the cold rolling glassed steel produced, Rp0.2 are 230~260MPa, and tensile strength Rm is 310~360MPa, is prolonged
Rate A50mm >=36% is stretched, the water heater liner resistance to pulsating fatigue service life of making is up to 300,000 times or more.
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, illustrate this hair in conjunction with table
It is bright.
The present invention proposes a kind of cold rolling glassed steel of yield strength 230MPa or more, the chemical composition of the cold rolling glassed steel
Weight percent is C：≤ 0.07Wt%, Si：≤ 0.03Wt%, Mn：0.25~0.50Wt%, P≤0.02Wt%, S≤
0.02Wt%, Alt:0.015~0.035Wt%, N:0.005~0.010Wt%；Surplus is Fe and inevitable micro member
Element；
By determining the chemical composition of cold rolling glassed steel, accurately controlling the content of harmful element and guarantee is beneficial to cold rolling and wards off
The quick-fried content with the element of fatigue performance of the anti-squama of porcelain steel.
Further, the cold rolling glassed steel takes following steps to make successively：Blast-melted smelting, desulfurizing iron are located in advance
Reason, converter molten steel smelting, the processing of LF liquid steel refinings, sheet billet continuous casting, hot continuous rolling, pickling cold continuous rolling, cover annealing and smooth；This
The precipitation that nitridation silicon alloy increases nitride is added by LF refining process for invention, is increased by smooth process elongation percentage smooth greatly
Dislocation density inside steel plate improves material yield strength and fish scaling resistance.The lower annealing holding temperature of bell-type annealing is opposite
In the high annealing temperature of continuous annealing process, the crystallite dimension of annealed sheet is smaller, cementite particle and analysis in ferrite crystal grain
The nitride gone out gets over small and dispersed, more advantageously reduces H and is spread in steel, improves the quick-fried performances of glassed steel Kang Scales.Wherein, described
In LF liquid steel refining processing steps：Molten steel carries out deoxidation and alloying processing in LF stoves, increases manganese using mid-carbon fe-mn, by 0.4-
0.8kg/ tons are added nitridation silicon alloy, increase the precipitation of nitride.
Further, in the cover annealing step：Holding temperature of annealing is 640~680 DEG C, the rate of heat addition≤50
DEG C/h, 6~8h of soaking time, cooling rate≤20 DEG C/h is controlled, control is cooled to 380 DEG C, tapping temperature≤80 DEG C.Pass through cover
Formula furnace annealing and its state modulator optimize the crystallite dimension and internal stress of the steel after hot continuous rolling.
Further, in the planarization step：Using second formation technique, with improve material internal dislocation density and
Yield strength, first time, smooth elongation percentage was set as 2.0~3.0%, and second of smooth elongation percentage is set as 2.0~2.5%.
Further, in the hot continuous rolling step：It is 1200~1250 DEG C to control slab heating temperature, to ensure strand
Within the stove inside holding time, so that micro alloying element is dissolved and control autstenitic grain size；Using seven rack continuous hot-rolling mills, finish to gauge
Temperature control is at 860~920 DEG C, 580~660 DEG C of coiling temperature, to reach every time enough drafts, ensure finishing temperature
And coiling temperature, control crystallite dimension.
Further, in the pickling cold continuous rolling step：Cold rolling is with respect to reduction ratio 55~70%, to reach enough deformations
Amount, cold-rolling thickness control are controlled according to nominal size+0.05mm.
Further, in the converter molten steel smelting step：Enter stove molten iron requirement S≤0.030Wt%, controls containing for sulphur
Amount；Smelting process is using whole argon bottom-blowing.
Further, in the sheet billet continuous casting step:It is detected and is controlled using ladle roughing slag, basket pouring temperature is 1550
~1580 DEG C, it is 1.30~1.48m/min that middle packet, which uses alkaline covering agent, Casting speed, ensures production direct motion, strand corner
Stable quality does not crack.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.01Wt%, Si：0.022Wt%,
Mn：0.30Wt%, P：0.013Wt%, S：0.004Wt%, Alt:0.024Wt%, N:0.0054Wt%.Finishing temperature control exists
910 DEG C, 640 DEG C of coiling temperature, annealing holding temperature is 660 DEG C, and cold rolling is 70% with respect to reduction ratio, for the first time smooth elongation percentage
It is set as 2.0%, second of smooth elongation percentage is set as 2.2%.The cold rolling glassed steel obtained in this way, yield strength reach
256MPa, tensile strength reach 352MPa, elongation percentage A50mmReach 38/%, the anti-quick-fried sensibility TH values (min/mm of squama2) reach
27.6, pulsating fatigue test life number is more than 300,000 times, function admirable.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.03Wt%, Si：0.024Wt%,
Mn：0.28Wt%, P：0.015Wt%, S：0.006Wt%, Alt:0.030Wt%, N:0.0067Wt%.Finishing temperature control exists
892 DEG C, 610 DEG C of coiling temperature, annealing holding temperature is 660 DEG C, and cold rolling is 70% with respect to reduction ratio, for the first time smooth elongation percentage
It is set as 2.2%, second of smooth elongation percentage is set as 2.2%.The cold rolling glassed steel obtained in this way, yield strength reach
251MPa, tensile strength reach 346MPa, elongation percentage A50mmReach 41/%, the anti-quick-fried sensibility TH values (min/mm of squama2) reach
22.6, pulsating fatigue test life number is more than 300,000 times, function admirable.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.05Wt%, Si：0.015Wt%,
Mn：0.42Wt%, P：0.015Wt%, S：0.010Wt%, Alt:0.032Wt%, N:0.0062Wt%.Finishing temperature control exists
880 DEG C, 600 DEG C of coiling temperature, annealing holding temperature is 640 DEG C, and cold rolling is 70% with respect to reduction ratio, for the first time smooth elongation percentage
It is set as 2.5%, second of smooth elongation percentage is set as 2.3%.The cold rolling glassed steel obtained in this way, yield strength reach
248MPa, tensile strength reach 338MPa, elongation percentage A50mmReach 41/%, the anti-quick-fried sensibility TH values (min/mm of squama2) reach
22.6, pulsating fatigue test life number is more than 300,000 times, function admirable.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.035Wt%, Si：
0.018Wt%, Mn：0.36Wt%, P：0.013Wt%, S：0.008Wt%, Alt:0.028Wt%, N:0.0072Wt%.Finish to gauge
At 885 DEG C, 585 DEG C of coiling temperature, annealing holding temperature is 640 DEG C for temperature control, and cold rolling is 67% with respect to reduction ratio, for the first time
Smooth elongation percentage is set as 2.8%, and second of smooth elongation percentage is set as 2.5%.The cold rolling glassed steel obtained in this way, surrender are strong
Degree reaches 242MPa, and tensile strength reaches 325MPa, elongation percentage A50mmReach 40/%, the anti-quick-fried sensibility TH values (min/mm of squama2)
Reach 21.5, pulsating fatigue test life number is more than 300,000 times, function admirable.
Further, the chemical component weight percentage of the cold rolling glassed steel is C：0.065Wt%, Si：
0.021Wt%, Mn：0.34Wt%, P：0.015Wt%, S：0.006Wt%, Alt:0.026Wt%, N:0.0085Wt%.Finish to gauge
At 874 DEG C, 580 DEG C of coiling temperature, annealing holding temperature is 640 DEG C for temperature control, and cold rolling is 58% with respect to reduction ratio, for the first time
Smooth elongation percentage is set as 2.8%, and second of smooth elongation percentage is set as 2.5%.The cold rolling glassed steel obtained in this way, surrender are strong
Degree reaches 246MPa, and tensile strength reaches 330MPa, elongation percentage A50mmReach 42/%, the anti-quick-fried sensibility TH values (min/mm of squama2)
Reach 21.5, pulsating fatigue test life number is more than 300,000 times, function admirable.
The present invention provides following instance and data：
Table 1：Product chemical composition (wt%)
Table 2：Each specific technological parameter of example
Table 3：The mechanical property and the quick-fried sensibility TH values of anti-squama of low-alloy high-strength steel obtained by each example, tired pulse service life examination
Test number
Pass through the example and data of above table, it can be seen that cold rolling enameled steel products yield strength R of the inventionp0.2
It is 310~360MPa, elongation percentage A for 230~260MPa, tensile strength Rm50mm>=36%, the resistance to pulse of water heater liner of making
Fatigue life is up to 300,000 times or more.
The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.For this
Each component part of invention can be combined with each other under conditions of not conflicting, for example, blast-melted smelting, desulfurizing iron are located in advance
Reason, converter molten steel smelting, the processing of LF liquid steel refinings, sheet billet continuous casting, hot continuous rolling, pickling cold continuous rolling, cover annealing and smooth
Parameter in each step can be combined with matched combined, temperature parameter, time parameter, rate parameter, reduction parameters to be formed it is excellent
Change process program and technological parameter system, to reach the preferable impact of performance, any those skilled in the art is not departing from this
Made equivalent variations and modification, should all belong to the scope of protection of the invention under the premise of the design of invention and principle.
Claims (10)
1. a kind of cold rolling glassed steel of yield strength 230MPa or more, which is characterized in that
The chemical component weight percentage of the cold rolling glassed steel is C：≤ 0.07Wt%, Si：≤ 0.03Wt%, Mn：0.25~
0.50Wt%, P≤0.02Wt%, S≤0.02Wt%, Alt:0.015~0.035Wt%, N:0.005~0.010Wt%；Surplus
It is for Fe and inevitably micro-.
2. the cold rolling glassed steel of yield strength 230MPa or more as described in claim 1, which is characterized in that the cold rolling enamel
The chemical component weight percentage of steel is C：0.01Wt%, Si：0.022Wt%, Mn：0.30Wt%, P：0.013Wt%, S：
0.004Wt%, Alt:0.024Wt%, N:0.0054Wt%.
3. the cold rolling glassed steel of yield strength 230MPa or more as described in claim 1, which is characterized in that the cold rolling enamel
The chemical component weight percentage of steel is C：0.03Wt%, Si：0.024Wt%, Mn：0.28Wt%, P：0.015Wt%, S：
0.006Wt%, Alt:0.030Wt%, N:0.0067Wt%.
4. the cold rolling glassed steel of yield strength 230MPa or more as described in claim 1, which is characterized in that the cold rolling enamel
The chemical component weight percentage of steel is C：0.05Wt%, Si：0.015Wt%, Mn：0.42Wt%, P：0.015Wt%, S：
0.010Wt%, Alt:0.032Wt%, N:0.0062Wt%.
5. the cold rolling glassed steel of yield strength 230MPa or more as described in claim 1, which is characterized in that the cold rolling enamel
The chemical component weight percentage of steel is C：0.035Wt%, Si：0.018Wt%, Mn：0.36Wt%, P：0.013Wt%, S：
0.008Wt%, Alt:0.028Wt%, N:0.0072Wt%.
6. the cold rolling glassed steel of yield strength 230MPa or more as described in claim 1, which is characterized in that the cold rolling enamel
The chemical component weight percentage of steel is C：0.065Wt%, Si：0.021Wt%, Mn：0.34Wt%, P：0.015Wt%, S：
0.006Wt%, Alt:0.026Wt%, N:0.0085Wt%.
7. the cold rolling glassed steel of yield strength 230MPa or more as described in claim 1, which is characterized in that the cold rolling enamel
Steel takes following steps to make successively：Blast-melted smelting, desulfurizing iron pretreatment, converter molten steel are smelted, at LF liquid steel refinings
Reason, sheet billet continuous casting, hot continuous rolling, pickling cold continuous rolling, cover annealing and smooth；Wherein, in the LF liquid steel refinings processing step：
Molten steel carries out deoxidation and alloying processing in LF stoves, increases manganese using mid-carbon fe-mn, is added by 0.4-0.8kg/ tons and nitrogenizes silicon alloy,
Increase the precipitation of nitride.
8. the cold rolling glassed steel of yield strength 230MPa or more as claimed in claim 7, which is characterized in that the bell furnace
In annealing steps：Holding temperature of annealing is 640~680 DEG C, the rate of heat addition≤50 DEG C/h, 6~8h of soaking time, controls cooling speed
Rate≤20 DEG C/h, control are cooled to 380 DEG C, tapping temperature≤80 DEG C.
9. the cold rolling glassed steel of yield strength 230MPa or more as claimed in claim 7, which is characterized in that the smooth step
In rapid：Using second formation technique, first time, smooth elongation percentage was set as 2.0~3.0%, and second of smooth elongation percentage is set as
2.0~2.5%.
10. the cold rolling glassed steel of yield strength 230MPa or more as claimed in claim 7, which is characterized in that the heat is even
It rolls in step：It is 1200~1250 DEG C to control slab heating temperature, to ensure that strand within the stove inside holding time, makes microalloying
Element solid solution simultaneously controls autstenitic grain size；Using seven rack continuous hot-rolling mills, finishing temperature control batches temperature at 860~920 DEG C
580~660 DEG C of degree.
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Cited By (4)
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| CN110541123A (en) * | 2019-09-05 | 2019-12-06 | 首钢集团有限公司 | cold-rolled strip steel for battery case and preparation method thereof |
| CN111074052A (en) * | 2019-12-30 | 2020-04-28 | 河钢集团衡水板业有限公司 | Production method of tinned substrate for SPCC deep drawing |
| CN111945059A (en) * | 2020-07-08 | 2020-11-17 | 柳州钢铁股份有限公司 | Cold-rolled high-strength heat-resistant enamel steel |
| CN111945060A (en) * | 2020-07-08 | 2020-11-17 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled high-strength heat-resistant enamel steel |
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| CN110541123A (en) * | 2019-09-05 | 2019-12-06 | 首钢集团有限公司 | cold-rolled strip steel for battery case and preparation method thereof |
| CN111074052A (en) * | 2019-12-30 | 2020-04-28 | 河钢集团衡水板业有限公司 | Production method of tinned substrate for SPCC deep drawing |
| CN111074052B (en) * | 2019-12-30 | 2021-10-15 | 河钢集团衡水板业有限公司 | Production method of tinned substrate for SPCC deep drawing |
| CN111945059A (en) * | 2020-07-08 | 2020-11-17 | 柳州钢铁股份有限公司 | Cold-rolled high-strength heat-resistant enamel steel |
| CN111945060A (en) * | 2020-07-08 | 2020-11-17 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled high-strength heat-resistant enamel steel |
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Application publication date: 20180928 |