CN106086665A - A kind of yield strength 530MPa level Hot Rolling Automobile steel plate and production method - Google Patents
A kind of yield strength 530MPa level Hot Rolling Automobile steel plate and production method Download PDFInfo
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- CN106086665A CN106086665A CN201610660261.5A CN201610660261A CN106086665A CN 106086665 A CN106086665 A CN 106086665A CN 201610660261 A CN201610660261 A CN 201610660261A CN 106086665 A CN106086665 A CN 106086665A
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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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- 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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
Abstract
A kind of yield strength 530MPa level Hot Rolling Automobile steel plate, its component and wt% be: C:0.06～0.10, Si: < 0.08, Mn:1.40～1.65, P≤0.010, S≤0.005, Als:0.02 ~ 0.07, Nb:0.035 ~ 0.055, Ti:0.046～0.065, N≤0.004；Production stage: strand is heated；Roughing；Finish rolling；Carry out leading portion section cooling；Batch.Steel plate of the present invention (1) intensity is high, is applied to automobile structure design weight loss effect up to 10% ~ 40%；(2) good moldability, it is adaptable to the technique such as punching press, bending；(3) welding procedure such as gas shield welding, submerged-arc welding it is applicable to.
Description
Technical field
The present invention relates to a kind of automotive sheet and production method thereof, specifically belong to a kind of yield strength 530MPa level heat
Rolling automobile steel plate and production method, its steel plate thickness is at 3 ~ 10mm.
Background technology
Along with Domestic Automotive Industry and traffic, the developing rapidly of transport service, the quickening of the most high-grade highway
Building, so that visitor, lorry keep the large-scale development, and large-tonnage truck and large-scale palace car demand are continuously increased.
But people conduct oneself with dignity to reduce it for the weight alleviating automobile component, reach to save the energy, alleviate environmental pollution and improve delivery
The purpose of efficiency, thus promote fast development and the application of high performance Hot Rolling Automobile Plate.
The production technology of yield strength 350MPa level Hot Rolling Automobile steel is at present the most ripe, auto industry application also
Wide.Along with the light-weighted development of automobile industry, automobile is more and more higher to the use demand of the beam steel of higher intensity rank.
The use demand of 530MPa grade high-strength beam steel is increasing.
In large-scale bogie designs, use Hot Rolling Automobile steel to make the structural members such as crossbeam, wheel, axle housing, be all to use
Cold stamping forming mode, its assembling mainly uses the techniques such as riveting, welding.It has the highest requirement to performance and formability.Steel
Plate intensity is the highest, and user uses the most difficult.
High-strength steel is owing to improve the percentage composition of alloying element, along with armor plate strength improves further, and the performance of steel plate
The sensitivity of temperature is improved, causes plate property fluctuation big.User is made in use to face a series of performance and surface
Quality problems, such as Mechanical Fluctuation are big, bring stamping cracking, resilience is big, uneven microstructure, internal stress are big problem.
Through retrieval, the patent of current hot continuous-milling steel plate includes alloying element, process for making, roughing temperature, final rolling temperature, volume
Take the content of the aspects such as temperature, often ignore the stability of steel plate, and plate property stability is close with heating furnace system
Cut is closed.As Patent publication No CN200810154866.2 describe more than yield strength 500MPa steel for automobile crossbeam and
Manufacture method, uses Nb-V-Ti alloying element to strengthen in the method, steel rolling process does not announces heating furnace system, steel plate
Can only provide the mechanical property of mono-thickness specification of 7.7mm.
The present invention is by the matched well of composition with technique, while making steel plate have high intensity, performance and surface quality
More stable, product quality meets user's use high request to automobile steel.
Summary of the invention
The invention reside in the deficiency overcoming prior art to exist, it is provided that one is making full use of existing equipment condition
Under, develop not only intensity rank high, and there is good plasticity, low-temperature flexibility, cold stamping, roll forming and resist tired
The 530MPa level Hot Rolling Automobile steel of labor performance and production method.
Realize the measure of above-mentioned purpose:
A kind of yield strength 530MPa level Hot Rolling Automobile steel plate, it uses carbon and manganese solution strengthening and niobium titanium precipitation strength,
Its chemical composition and weight percent content be: C:0.06～0.10, Si: < 0.08, Mn:1.40～1.65, P≤0.010, S≤
0.005, Als:0.02 ~ 0.07, Nb:0.035 ~ 0.055, Ti:0.046～0.065, N≤0.004, surplus is Fe and can not keep away
The impurity exempted from；Metallographic structure is ferrite+pearlite.
A kind of method producing yield strength 530MPa level Hot Rolling Automobile steel plate, it is characterised in that: its step:
1) strand is heated, and control: preheating section furnace temperature is at 500 ~ 700 DEG C, and time inside furnace is no less than 30 minutes；First bringing-up section
Furnace temperature is at 700 ~ 900 DEG C, and time inside furnace is no less than 50 minutes；Second bringing-up section furnace temperature is at 900 ~ 1230 DEG C, and time inside furnace is the lowest
In 50 minutes；Soaking zone furnace temperature is at 1230 ~ 1270 DEG C, and time inside furnace is no less than 30 minutes；Overall time inside furnace is no less than 160 points
Clock；
2) carry out roughing, and control roughing outlet temperature at 1040 ~ 1140 DEG C；
3) carry out finish rolling, and control exit temperature at finishing at 820 ~ 900 DEG C；
4) use leading portion section cooling, in section cooling line leading portion 0 meter to 20 meters, i.e. carry out section cooling, control rate of cooling
Less than 25 DEG C/s, it is cooled to coiling temperature；
5) batch, and control coiling temperature at 590 ~ 630 DEG C.
Each element and the effect of main technique and mechanism in the present invention
C, carbon is cheap solution strengthening element.If its content is more than 0.10%, then press formability can reduce；If it contains
Amount less than 0.06%, then can not meet the material requirement to intensity, so, its content is limited to 0.06%～0.10% scope.
Si, silicon is combined with oxygen, ferrum during heating process, forms olive-shaped iron scale, is tightly attached to surface of steel plate, no
Easily wash out, the operation of rolling is formed oxide skin load mould, deteriorates the surface quality of hot rolled steel plate, so, its content is limited to
0.08% scope.
Als, aluminum adds for deoxidation, when Als content is less than 0.020%, it is impossible to play its effect；The opposing party
Face, easily forms aluminium oxide agglomerate owing to adding the aluminum of volume, so, it is stipulated that the Als upper limit is 0.070%.Therefore, Als content limit
It is scheduled on 0.020%～0.070% scope.
Mn, manganese is to improve intensity and the maximally effective element of toughness, can improve the intensity-extension balance of steel.But add
The manganese of volume, can cause the quenching degree increasing steel, in consideration of it, 1.40% will be defined on it, so, its content is limited to
1.40%～1.65% scope.
P, phosphorus is the harmful element in steel, easily causes center segregation of casting blank, in order to avoid cold bending performance, toughness occur
Deteriorate, set its upper content limit as 0.010%.
S, sulfur is very harmful element.Sulfur in steel often exists with the oxide morphology of manganese, this sulphide inculsion pair
The impact flexibility of steel is the most disadvantageous, and causes the anisotropy of performance, therefore, need to sulfur content in steel be controlled the lowest more
Good.Based on the consideration to steel plate cold bending forming technology and manufacturing cost, plan sulfur content in steel and control below 0.010%.
N, N element is evil element, is easily combined formation metallic inclusion with titanium, weakens the effect of titanium.So, contained
Amount is limited to≤0.004%.
Nb, niobium is indispensable element in non-recrystallization controlled rolling, crystal grain thinning, reduction Austria in thermomechanical processing
Family name's body, to ferritic transition temperature and precipitation strength, therefore adds trace alloying element niobium and can be easy to controlled rolling in steel
Carry out, and improve intensity and the toughness of steel plate.So, the consideration of the aspects such as comprehensive mechanical property of steel plate and cost, by its content
It is limited to 0.035～0.055% scope.
Ti, titanium is micro alloying element, adds the titanium of trace in steel, can well change the pattern of sulphide inculsion,
Obtain good cold-bending property, and, precipitation compound with carbon and nitrogen, crystal grain thinning, play certain strengthening conduct.So, will
Its content is limited to 0.046～0.065% scope.
The present invention compared with prior art, has the advantage that (1) intensity is high, is applied to automobile structure design loss of weight
Effect is up to 10% ~ 40%；(2) good moldability, it is adaptable to the technique such as punching press, bending；(3) weldering such as gas shield welding, submerged-arc welding it is applicable to
Connect technique.
Detailed description of the invention
Below the present invention is described in detail:
Table 1 is various embodiments of the present invention and comparative example component value list；
Table 2 is various embodiments of the present invention and comparative example main technique value list；
Table 3 is various embodiments of the present invention and comparative example performance test results list.
Various embodiments of the present invention all produce according to following steps:
1) strand is heated, and control: preheating section furnace temperature is at 500 ~ 700 DEG C, and time inside furnace is no less than 30 minutes；First bringing-up section
Furnace temperature is at 700 ~ 900 DEG C, and time inside furnace is no less than 50 minutes；Second bringing-up section furnace temperature is at 900 ~ 1230 DEG C, and time inside furnace is the lowest
In 50 minutes；Soaking zone furnace temperature is at 1230 ~ 1270 DEG C, and time inside furnace is no less than 30 minutes；Overall time inside furnace is no less than 160 points
Clock；
2) carry out roughing, and control roughing outlet temperature at 1040 ~ 1140 DEG C；
3) carry out finish rolling, and control exit temperature at finishing at 820 ~ 900 DEG C；
4) use leading portion section cooling, in section cooling line leading portion 0 meter to 20 meters, i.e. carry out section cooling, control rate of cooling
Less than 25 DEG C/s, it is cooled to coiling temperature；
5) batch, and control coiling temperature at 590 ~ 630 DEG C.
Table 1 various embodiments of the present invention chemical composition (wt.%)
Table 2 various embodiments of the present invention main technique value list；
Table 3 various embodiments of the present invention and comparative example performance test results list
From table 3 it can be seen that the present invention is by the matched well of chemical composition with hot rolling technology, the stability contorting of temperature, surrender
Intensity is at more than 530MPa, and strength fluctuation is within 50MPa, and performance inconsistency is little, even tissue, and internal stress is little, and surface quality is excellent
Good, meet automobile factory's requirement to high strength steel stability.
This detailed description of the invention is only and most preferably enumerates, the not restricted enforcement to technical solution of the present invention.
Claims (2)
1. a yield strength 530MPa level Hot Rolling Automobile steel plate, it is strong that it uses carbon and manganese solution strengthening and niobium titanium to separate out
Changing, its chemical composition and weight percent content be: C:0.06～0.10, Si: < 0.08, Mn:1.40～1.65, P≤0.010,
S≤0.005, Als:0.02 ~ 0.07, Nb:0.035 ~ 0.055, Ti:0.046～0.065, N≤0.004, surplus is Fe and can not
The impurity avoided；Metallographic structure is ferrite+pearlite.
2. the method producing a kind of yield strength 530MPa level Hot Rolling Automobile steel plate as claimed in claim 1, its feature
It is: its step:
1) strand is heated, and control: preheating section furnace temperature is at 500 ~ 700 DEG C, and time inside furnace is no less than 30 minutes；First bringing-up section
Furnace temperature is at 700 ~ 900 DEG C, and time inside furnace is no less than 50 minutes；Second bringing-up section furnace temperature is at 900 ~ 1230 DEG C, and time inside furnace is the lowest
In 50 minutes；Soaking zone furnace temperature is at 1230 ~ 1270 DEG C, and time inside furnace is no less than 30 minutes；Overall time inside furnace is no less than 160 points
Clock；
2) carry out roughing, and control roughing outlet temperature at 1040 ~ 1140 DEG C；
3) carry out finish rolling, and control exit temperature at finishing at 820 ~ 900 DEG C；
4) use leading portion section cooling, in section cooling line leading portion 0 meter to 20 meters, i.e. carry out section cooling, control rate of cooling
Less than 25 DEG C/s, it is cooled to coiling temperature；
5) batch, and control coiling temperature at 590 ~ 630 DEG C.
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| CN201610660261.5A CN106086665B (en) | 2016-08-12 | 2016-08-12 | A kind of yield strength 530MPa grades of Hot Rolling Automobile steel plates and production method |
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| CN201610660261.5A CN106086665B (en) | 2016-08-12 | 2016-08-12 | A kind of yield strength 530MPa grades of Hot Rolling Automobile steel plates and production method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107287517A (en) * | 2017-06-09 | 2017-10-24 | 唐山不锈钢有限责任公司 | High-tensile structural steel Q550C and its production method |
| CN107641760A (en) * | 2017-09-26 | 2018-01-30 | 武汉钢铁有限公司 | 460MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good fatigue behaviour |
| CN107641761A (en) * | 2017-09-26 | 2018-01-30 | 武汉钢铁有限公司 | 500MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good welds performance |
| CN107699798A (en) * | 2017-11-24 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 610MPa level hot rollings |
| CN109023111A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN110227713A (en) * | 2019-06-27 | 2019-09-13 | 武汉钢铁有限公司 | The energy-saving milling method of mild steel |
| CN110252804A (en) * | 2019-04-30 | 2019-09-20 | 武汉钢铁有限公司 | The production method of hot continuous rolling production thin gauge ultra-low-carbon steel |
| CN110331344A (en) * | 2019-07-15 | 2019-10-15 | 武汉钢铁有限公司 | A kind of Rm >=600MPa beam steel that strength character is stable and production method |
| CN112517638A (en) * | 2020-10-20 | 2021-03-19 | 江苏省沙钢钢铁研究院有限公司 | Control method of hot-rolled high-strength steel strip-shaped structure for cold roll forming |
| CN113549843A (en) * | 2021-07-29 | 2021-10-26 | 重庆钢铁股份有限公司 | 610L automobile beam steel belt and manufacturing and application thereof |
| CN115637385A (en) * | 2022-11-01 | 2023-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength steel for automobile wheel rim and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007154240A (en) * | 2005-12-02 | 2007-06-21 | Kobe Steel Ltd | High strength spring steel wire with excellent coiling property and hydrogen embrittlement resistance |
| CN104988398A (en) * | 2015-07-17 | 2015-10-21 | 武汉钢铁(集团)公司 | 610MPa-grade automobile frame steel and preparation method thereof |
-
2016
- 2016-08-12 CN CN201610660261.5A patent/CN106086665B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007154240A (en) * | 2005-12-02 | 2007-06-21 | Kobe Steel Ltd | High strength spring steel wire with excellent coiling property and hydrogen embrittlement resistance |
| CN104988398A (en) * | 2015-07-17 | 2015-10-21 | 武汉钢铁(集团)公司 | 610MPa-grade automobile frame steel and preparation method thereof |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107287517A (en) * | 2017-06-09 | 2017-10-24 | 唐山不锈钢有限责任公司 | High-tensile structural steel Q550C and its production method |
| CN107641760A (en) * | 2017-09-26 | 2018-01-30 | 武汉钢铁有限公司 | 460MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good fatigue behaviour |
| CN107641761A (en) * | 2017-09-26 | 2018-01-30 | 武汉钢铁有限公司 | 500MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good welds performance |
| CN107699798A (en) * | 2017-11-24 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 610MPa level hot rollings |
| CN109023111A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN109023111B (en) * | 2018-09-26 | 2020-04-07 | 武汉钢铁有限公司 | 1000 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof |
| CN110252804A (en) * | 2019-04-30 | 2019-09-20 | 武汉钢铁有限公司 | The production method of hot continuous rolling production thin gauge ultra-low-carbon steel |
| CN110227713A (en) * | 2019-06-27 | 2019-09-13 | 武汉钢铁有限公司 | The energy-saving milling method of mild steel |
| CN110331344A (en) * | 2019-07-15 | 2019-10-15 | 武汉钢铁有限公司 | A kind of Rm >=600MPa beam steel that strength character is stable and production method |
| CN110331344B (en) * | 2019-07-15 | 2021-04-06 | 武汉钢铁有限公司 | Automobile girder steel with stable strength performance and Rm of more than or equal to 600MPa and production method thereof |
| CN112517638A (en) * | 2020-10-20 | 2021-03-19 | 江苏省沙钢钢铁研究院有限公司 | Control method of hot-rolled high-strength steel strip-shaped structure for cold roll forming |
| CN113549843A (en) * | 2021-07-29 | 2021-10-26 | 重庆钢铁股份有限公司 | 610L automobile beam steel belt and manufacturing and application thereof |
| CN115637385A (en) * | 2022-11-01 | 2023-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength steel for automobile wheel rim and preparation method thereof |
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| CN106086665B (en) | 2018-08-07 |
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