CN107287505A - A kind of car panel steel and preparation method thereof - Google Patents
A kind of car panel steel and preparation method thereof Download PDFInfo
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- CN107287505A CN107287505A CN201710659894.9A CN201710659894A CN107287505A CN 107287505 A CN107287505 A CN 107287505A CN 201710659894 A CN201710659894 A CN 201710659894A CN 107287505 A CN107287505 A CN 107287505A
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The present invention relates to a kind of car panel steel and preparation method thereof, its component and weight percent content are：C：≤ 0.002%；Si：0.03%~0.05%；Mn：0.24%~0.30%；P：≤ 0.005%；Ti：0.03%~0.05%；Al：0.015%~0.030%；S：≤ 0.006%；N：≤ 0.003%；Nb：0.025%~0.035%；Ce：0.01%~0.015%；Nd：0.008%~0.012%.Processing route：Smelting → continuously casting → hot rolling → cold rolling → annealing；Smelting process uses RH OB mode depth decarburizations, Ce, Nd alloying element to use argon gas after adding to ladle soft blow 15~20 minutes；Slab was in burial pit inside holding 48 hours；Hot incoming slab is heated to 1280 DEG C, 1230 DEG C of breaking down temperature, 950 DEG C of finishing temperature, and hot-rolling coiling temperature is at 620~650 DEG C；Hot rolled coil turns into cold rolled sheet through cold rolling, and cold rolled sheet is heated to 870 degrees Celsius in annealing furnace, rear insulation 2.5 hours, finally with annealing furnace natural cooling.Sheet material produced by the present invention has very high intensity, and can keep good deep drawability.
Description
Technical field
The present invention relates to the Material Field of automobile making, and in particular to a kind of car panel steel and preparation method thereof.
Background technology
Car panel is experienced from boiling steel to aluminum killed steel with steel to current ultra-low-carbon steel, it may be said that automobile steel is sent out
Qualitative leap is given birth to.The pure ferritic steel of Ultra-low carbon gap-free atom, it is developed successfully 1949 earliest, and it is substantially former
Reason is to add the elements such as a certain amount of Ti, Nb in ultralow C, N steel, and interstitial atom C, N in steel are fixed as into carboritride,
The ferrite of cleaning is obtained, so that with good deep drawability.As people require automotive performance to improve constantly, particularly
Consideration in terms of safety, comfortable, oil consumption, this just proposes new requirement to automobile board, mainly including following three points:It is high-strength
It is degree (improve safety mark), thin rule (mitigate automobile product deadweight, save material, reduce the consumption of fuel oil, reduce cost), resistance to
Corrode (process for treating surface such as galvanized sheet or alloy galvanized sheet).The automobile board of production higher intensity is particularly important.
The tensile strength of current Ultra-low carbon car panel steel is universal between 340MPa~400MPa, r values 1.8~
2.0 between.The limit is had practically already been achieved by increasing the method to improve intensity of above-mentioned intensified element content at present, it is lasting to increase
Plus although intensified element can improve tensile strength, the deep drawability of material can drastically decline.Therefore need to design a kind of simultaneous
Car panel steel with the new energy of the high deep-draw of high intensity.
The content of the invention
It is an object of the invention to provide a kind of car panel steel and preparation method thereof, to solve in above-mentioned background technology
The problem of mentioning.
To achieve the above object, the present invention provides following technical scheme：A kind of car panel steel, its component and weight hundred
Divide and be than content：C：≤ 0.002%；Si：0.03%~0.05%；Mn：0.24%~0.30%；P：≤ 0.005%；Ti：
0.03%~0.05%；Al：0.015%~0.030%；S：≤ 0.006%；N：≤ 0.003%；Nb：0.025%~
0.035%；Ce：0.01%~0.015%；Nd：0.008%~0.012%；Remaining is Fe and inevitable impurity.
C atoms play a part of solution strengthening in carbon steel, but are then harmful element for car panel steel, Ying Jia
To control, because C atoms gap is solid-solubilized in steel so that { 111 } component is drastically reduced in recrystallization texture, seriously damages automobile
The deep drawability r values of panel steel, therefore, are limited to below 20PPm.
The main function that alloying element Ti is added in the present invention is to combine to form carbon, nitrogen compound with C, N, so that between eliminating
C, N atom of gap solid solution so that ferrite grain boundaries do not have Second Phase Precipitation, obtain pure ferrite matrix, between eliminating
The adverse effect of gap atom, to ensure deep-draw r values.
The alloying of Nb, Mn and Si element reaches the purpose of solution strengthening.In two kinds of elements, Nb invigoration effect is maximum,
And larger is influenceed on r values, Mn elements reduce the deep drawability of steel, therefore Nb, Mn as the intensified element in steel when addition is high
The scope that element can not be limited beyond formula.Nb is to be remarkably improved intensity and not according to 0.025%~0.035% addition
Reduce the r values of material.
Al elements play a part of deoxidation and crystal grain thinning, but Al elements or when causing the crystal grain ability high temperature in material it is anxious
Speed is grown up, therefore the content of Al elements must be controlled within 0.015%~0.030%, can both ensure deoxidation effect or will not
Excessive grain is caused to be grown up.
Ce elements and Nd elements can not only greatly improve intensity by crystal grain thinning, and not influence the deep drawing quality of material
Can, Ce elements and Nd elements can also be marginally solid-solubilized in eliminate or mitigate the segregation of P, S element in the crystal structure of material,
Reduce car panel steel secondary processing brittleness.By controlling the solid solution ratio of oxygen, sulfur content and Ce elements and Nd elements, Ce is designed
Content is 0.01%~0.015%；Nd constituent contents are 0.008%~0.012%.
Present invention also offers a kind of preparation method of car panel steel, following processing route is included：Smelt → continuous
Casting → hot rolling → cold rolling → annealing；Described smelting process uses RH-OB mode depth decarburizations, wherein Ce, Nd alloying element
Added after decarburization, Ce, Nd alloying element use argon gas to ladle soft blow 15~20 minutes after adding；The slab of continuously casting
In burial pit inside holding 48 hours；Heating of plate blank makes its complete austenitizing to 1280 DEG C, and hot rolling breaking down temperature is 1230 DEG C,
Finishing temperature is 950 DEG C, and hot-rolling coiling temperature is at 620~650 DEG C；Hot rolled coil turns into cold rolled sheet, cold rolled sheet by cold rolling
870 degrees Celsius are heated in annealing furnace, then 2.5 hours are incubated, cold rolled sheet is with annealing furnace natural cooling.
It is preferred that, described RH-OB tapping temperature is controlled at 1590 DEG C~1600 DEG C.
It is preferred that, described continuously casting link, the degree of superheat of molten steel is controlled at 15 DEG C~20 DEG C.
It is preferred that, described smelting and continuous casting link, the B type impurities in steel are controlled below B0.5 ranks.
The technological merit of the present invention is as follows：
The car panel steel produced by inventive formulation and preparation method, its deep drawing quality is outstanding, and deep-draw r values can
To ensure more than 1.9, tensile strength reaches 440~480 MPas.Compared to traditional car panel steel, what the present invention was provided
Automobile steel and existing car panel steel have a similar deep drawability, but the vapour made according to technical solution of the present invention
Car panel steel has higher tensile strength.
Embodiment
The technical scheme of this patent is described in more detail with reference to specific embodiment.
Embodiment 1
A kind of car panel steel, its component and weight percent content are：C：0.002%；Si：0.03%；Mn：
0.24%；P：0.005%；Ti：0.03%；Al：0.015%；S：0.006%；N：0.003%；Nb：0.025%；Ce：
0.01%；Nd：0.008%；Remaining is Fe and inevitable impurity.
A kind of preparation method of car panel steel, is comprised the steps of：
(1) component and weight percent content for smelting the molten steel be：C：0.002%；Si：0.03%；Mn：
0.24%；P：0.005%；Ti：0.03%；Al：0.015%；S：0.006%；N：0.003%；Nb：0.025%；Ce：
0.01%；Nd：0.008%；Remaining is the molten steel of Fe and inevitable impurity；Smelting process is de- using RH-OB modes depth
Carbon, wherein Ce, Nd alloying element is added after decarburization, and Ce, Nd alloying element use argon gas to 20 points of ladle soft blow after adding
Clock；RH-OB tapping temperature is controlled at 1590 DEG C~1600 DEG C, and temperature drop surplus is provided for soft blow.
(2) continuously casting：Continuously casting formation slab is carried out to molten steel using slab caster, slab is protected in burial pit
Temperature can send hot rolling in 48 hours.The degree of superheat of continuous casting is controlled in 20 degrees centigrades.
(3) heating of plate blank makes its complete austenitizing to 1280 DEG C, and hot rolling breaking down temperature is 1230 DEG C, and finishing temperature is
950 DEG C, hot-rolling coiling temperature is at 620~650 DEG C；
(4) sheet material of hot rolled coil is cold rolled to thin plate after pickling.
(5) cold rolled sheet is heated to 870 degrees Celsius in annealing furnace, is then incubated 2.5 hours, cold rolled sheet is with annealing furnace
Natural cooling can obtain target plate.
(6) mechanical property is carried out to target plate made from step (5) and deep drawability is detected, testing result is shown in Table 1
The mechanical property Examined of table 1
Embodiment 2
A kind of car panel steel, its component and weight percent content are：C：0.002%；Si：0.04%；Mn：
0.28%；P：0.005%；Ti：0.04%；Al：0.020%；S：0.006%；N：0.003%；Nb：0.03%；Ce：
0.012%；Nd：0.01%；Remaining is Fe and inevitable impurity.
A kind of preparation method of car panel steel, is comprised the steps of：
(1) component and weight percent content for smelting the molten steel be：C：0.002%；Si：0.04%；Mn：
0.28%；P：0.005%；Ti：0.04%；Al：0.020%；S：0.006%；N：0.003%；Nb：0.03%；Ce：
0.012%；Nd：0.01%；Remaining is Fe and inevitable impurity.Smelting process uses RH-OB mode depth decarburizations, wherein
Ce, Nd alloying element are added after decarburization, and Ce, Nd alloying element use argon gas to ladle soft blow 20 minutes after adding；RH-OB
Tapping temperature control at 1590 DEG C~1600 DEG C, provide temperature drop surplus for soft blow.
(2) continuously casting：Continuously casting formation slab is carried out to molten steel using slab caster, slab is protected in burial pit
Temperature can send hot rolling in 48 hours.The degree of superheat of continuous casting is controlled in 20 degrees centigrades.
(3) heating of plate blank makes its complete austenitizing to 1280 DEG C, and hot rolling breaking down temperature is 1230 DEG C, and finishing temperature is
950 DEG C, hot-rolling coiling temperature is at 620~650 DEG C；
(4) sheet material of hot rolled coil is cold rolled to thin plate after pickling.
(5) cold rolled sheet is heated to 870 degrees Celsius in annealing furnace, is then incubated 2.5 hours, cold rolled sheet is with annealing furnace
Natural cooling can obtain target plate.
(6) mechanical property is carried out to target plate made from step (5) and deep drawability is detected, testing result is shown in Table 2
The mechanical property Examined of table 2
| Sample sequence number | Rel(MPa) | Rm(MPa) | A (%) | R values | N values |
| 1 | 222 | 460 | 36.7% | 1.92 | 0.26 |
| 2 | 225 | 462 | 35.4% | 2.01 | 0.25 |
| 3 | 232 | 467 | 37.3% | 1.99 | 0.26 |
| 4 | 227 | 458 | 36.2% | 1.97 | 0.25 |
Embodiment 3
A kind of car panel steel, its component and weight percent content are：C：0.002%；Si：0.05%；Mn：
0.30%；P：0.005%；Ti：0.05%；Al：0.030%；S：0.006%；N：0.003%；Nb：0.035%；Ce：
0.015%；Nd：0.012%；Remaining is Fe and inevitable impurity.
A kind of preparation method of car panel steel, is comprised the steps of：
(1) component and weight percent content for smelting the molten steel be：C：0.002%；Si：0.05%；Mn：
0.30%；P：0.005%；Ti：0.05%；Al：0.030%；S：0.006%；N：0.003%；Nb：0.035%；Ce：
0.015%；Nd：0.012%；Remaining is Fe and inevitable impurity.Smelting process uses RH-OB mode depth decarburizations, its
Middle Ce, Nd alloying element is added after decarburization, and Ce, Nd alloying element use argon gas to ladle soft blow 20 minutes after adding；RH-
OB tapping temperature is controlled at 1590 DEG C~1600 DEG C, and temperature drop surplus is provided for soft blow.
(2) continuously casting：Continuously casting formation slab is carried out to molten steel using slab caster, slab is protected in burial pit
Temperature can send hot rolling in 48 hours.The degree of superheat of continuous casting is controlled in 20 degrees centigrades.
(3) heating of plate blank makes its complete austenitizing to 1280 DEG C, and hot rolling breaking down temperature is 1230 DEG C, and finishing temperature is
950 DEG C, hot-rolling coiling temperature is at 620~650 DEG C；
(4) sheet material of hot rolled coil is cold rolled to thin plate after pickling.
(5) cold rolled sheet is heated to 870 degrees Celsius in annealing furnace, is then incubated 2.5 hours, cold rolled sheet is with annealing furnace
Natural cooling can obtain target plate.
(6) mechanical property is carried out to target plate made from step (5) and deep drawability is detected, testing result is shown in Table 3
The mechanical property Examined of table 3
| Sample sequence number | Rel(MPa) | Rm(MPa) | A (%) | R values | N values |
| 1 | 231 | 478 | 36.7% | 1.98 | 0.28 |
| 2 | 227 | 481 | 37.2% | 1.95 | 0.28 |
| 3 | 226 | 485 | 39.3% | 2.04 | 0.28 |
| 4 | 233 | 472 | 38.4% | 2.12 | 0.28 |
The preferred embodiment mode to this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party
, can also be on the premise of this patent objective not be departed from formula, the knowledge that one skilled in the relevant art possesses
Make a variety of changes.It should be appreciated that all other specific embodiments based on the present invention program are in the protection of the present invention
Within the scope of.
Claims (5)
1. a kind of car panel steel, its component and weight percent content are：C：≤ 0.002%；Si：0.03%~
0.05%；Mn：0.24%~0.30%；P：≤ 0.005%；Ti：0.03%~0.05%；Al：0.015%~0.030%；S：
≤ 0.006%；N：≤ 0.003%；Nb：0.025%~0.035%；Ce：0.01%~0.015%；Nd：0.008%~
0.012%；Remaining is Fe and inevitable impurity.
2. the preparation method of the car panel steel described in a kind of claim 1, it is characterised in that include following processing route：Smelting
Refining → continuously casting → hot rolling → cold rolling → annealing；Described smelting process uses RH-OB mode depth decarburizations, wherein Ce, Nd
Alloying element is added after decarburization, and Ce, Nd alloying element use argon gas to ladle soft blow 15~20 minutes after adding；Continuous casting
The slab made was in burial pit inside holding 48 hours；Heating of plate blank makes its complete austenitizing to 1280 DEG C, and hot rolling breaking down temperature is
1230 DEG C, finishing temperature is 950 DEG C, and hot-rolling coiling temperature is at 620~650 DEG C；Hot rolled coil passes through cold rolling as cold rolled sheet, cold
Rolling sheets are heated to 870 degrees Celsius in annealing furnace, are then incubated 2.5 hours, cold rolled sheet is with annealing furnace natural cooling.
3. the preparation method of car panel steel according to claim 2, it is characterised in that：Described RH-OB tapping
Temperature control is at 1590 DEG C~1600 DEG C.
4. the preparation method of car panel steel according to claim 2, it is characterised in that：Described continuously casting ring
Section, the degree of superheat of molten steel is controlled at 15 DEG C~20 DEG C.
5. the preparation method of car panel steel according to claim 2, it is characterised in that：Described smelting and continuous casting ring
B type impurities in section, steel are controlled below B0.5 ranks.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710659894.9A CN107287505A (en) | 2017-08-04 | 2017-08-04 | A kind of car panel steel and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115652180A (en) * | 2022-12-02 | 2023-01-31 | 江苏维卡金属合金材料有限公司 | Duplex smelting process for preparing high-deep-drawing cold-heading Fe-Ni42 alloy |
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| CN115652180A (en) * | 2022-12-02 | 2023-01-31 | 江苏维卡金属合金材料有限公司 | Duplex smelting process for preparing high-deep-drawing cold-heading Fe-Ni42 alloy |
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