CN110129669A - A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof - Google Patents
A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof Download PDFInfo
- Publication number
- CN110129669A CN110129669A CN201910340915.XA CN201910340915A CN110129669A CN 110129669 A CN110129669 A CN 110129669A CN 201910340915 A CN201910340915 A CN 201910340915A CN 110129669 A CN110129669 A CN 110129669A
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- Prior art keywords
- steel
- automobile
- tubulose
- trailing arm
- steel pipe
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Classifications
-
- 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
- C21D1/28—Normalising
-
- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- C22C38/12—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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof, automobile tubulose trailing arm steel provided by the invention, by weight percentage, the chemical component of the steel are as follows: C:0.07-0.25%, Si≤0.3%, Mn:0.8-1.6%, P≤0.02%, S≤0.006%, Nb:0.01-0.04%, Ti:0.01-0.04%, V:0.01-0.04%, remaining is Fe and inevitable impurity；The steel metallographic structure is ferrite+pearlite.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe
And preparation method thereof.
Background technique
In order to reduce oil consumption and discharge amount, needs to carry out lightweight to automobile, be replaced using integrally formed hollow unit
Welding cast member is the effective way of automobile lightweight, and trailing arm passes through as the nuclear structure part in chassis suspension
Hollow tubular trailing arm made from hollow unit Simulation Based On Multi-step forming technique successfully realizes car body itself loss of weight, at present automobile pipe
Shape trailing arm is mainly Hi-Stren steel with steel, adds the alloying elements such as a large amount of Nb, Ti, V, Mo, higher cost, and be difficult to
Shape more complicated components.Therefore, this field needs to develop a kind of inexpensive, high formability energy automobile tubulose trailing arm
Use steel.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State automobile tubulose trailing arm steel of problem and preparation method thereof and steel pipe and preparation method thereof.
The embodiment of the present invention provides a kind of automobile tubulose trailing arm steel, which is characterized in that by weight percentage, the steel
Chemical component are as follows: C:0.07-0.25%, Si≤0.3%, Mn:0.8-1.6%, P≤0.02%, S≤0.006%, Nb:
0.01-0.04%, Ti:0.01-0.04%, V:0.01-0.04%, remaining is Fe and inevitable impurity；The steel metallographic group
It is woven to ferrite+pearlite.
Further, tensile strength >=540MPa of the steel.
Further, the elongation percentage A of the steel50>=28%.
Based on the same inventive concept, the embodiment of the present invention also provides a kind of preparation method of automobile tubulose trailing arm steel, packet
Include: molten steel allotment, heating, roughing, finish rolling, section cooling, is batched, smooth and acid pickling step continuous casting, which is characterized in that presses institute
It states chemical component and carries out the molten steel allotment, the roughing final temperature is 1020-1120 DEG C, and the finish rolling final temperature is
830-900 DEG C, the coiling temperature is 500-650 DEG C.
Based on the same inventive concept, the embodiment of the present invention is also provided using steel made from a kind of automobile tubulose trailing arm steel
Pipe, which is characterized in that band-like rank≤1 grade of steel pipe metallographic structure medium pearlite, tensile strength >=500MPa, and yield tensile ratio
≤0.76。
Further, the steel pipe elongation percentage A50>=32%,
Based on the same inventive concept, the embodiment of the present invention also provides a kind of system of steel pipe made from automobile tubulose trailing arm steel
Preparation Method, comprising: 880-980 DEG C of normalized treatment is carried out to steel pipe, after keeping the temperature 5-20min, is air-cooled to room temperature.
One or more technical solutions in the embodiment of the present invention, have at least the following technical effects or advantages:
(1) the application automobile tubulose trailing arm C component system in steel use, and microalloy is carried out by appropriate Nb-V-Ti
Strengthen, guarantee finished steel tensile strength with higher and elongation percentage, organize as ferrite+pearlite, structural homogenity is significant
It improves, finished steel is made to have the characteristics that high intensity, high-ductility, low cost.
(2) preparation method of the application automobile tubulose trailing arm steel, by the control to roughing final temperature, so that Ovshinsky
Body recrystallization can be carried out sufficiently, and austenite grain is refined because recrystallization occurs, and the austenite grain of refinement is conducive to finished iron
Ferritic refinement.By the control to finish rolling final temperature, austenite grain is elongated, forms a large amount of Zona transformans in crystal grain, become
The position of the preferential forming core of ferrite, fetrite grain refinement is more aobvious, promotes product strength and plasticity.By to coiling temperature
Control, it is voxel volume+pearlite that product matrix, which may be implemented, and has good intensity, plasticity matching.
(3) it is heat-treated by homogeneous tube normalizing, matrix is ferrite+pearlite, and structural homogenity significantly improves, and band
Shape is substantially reduced, tensile strength >=500MPa, and elongation percentage improves 4%, has good forming property and fatigue behaviour.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects
It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating
The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field
Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention
The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through
Market is commercially available or can be prepared by existing method.
The application provides a kind of automobile tubulose trailing arm steel, which is characterized in that by weight percentage, the chemistry of the steel
Ingredient are as follows: C:0.07-0.25%, Si≤0.3%, Mn:0.8-1.6%, P≤0.02%, S≤0.006%, Nb:0.01-
0.04%, Ti:0.01-0.04%, V:0.01-0.04%, remaining is Fe and inevitable impurity；The steel metallographic structure is iron
Ferritic+pearlite.
In the application, tensile strength >=540MPa of the steel.
In the application, the elongation percentage A of the steel50>=28%.
Based on the same inventive concept, the application also provides a kind of preparation method of automobile tubulose trailing arm steel, comprising: molten steel
Allotment, heating, roughing, finish rolling, section cooling, is batched, smooth and acid pickling step continuous casting, which is characterized in that by it is described chemistry at
Dividing and carries out the molten steel allotment, the roughing final temperature is 1020-1120 DEG C, and the finish rolling final temperature is 830-900 DEG C,
The coiling temperature is 500-650 DEG C.
Based on the same inventive concept, the application is also provided using steel pipe made from a kind of automobile tubulose trailing arm steel, special
Sign is, band-like rank≤1 grade of steel pipe metallographic structure medium pearlite, tensile strength >=500MPa, and yield tensile ratio≤0.76.
In the application, the steel pipe elongation percentage A50>=32%,
Based on the same inventive concept, the application also provides a kind of preparation side of steel pipe made from automobile tubulose trailing arm steel
Method, comprising: 880-980 DEG C of normalized treatment is carried out to steel pipe, after keeping the temperature 5-20min, is air-cooled to room temperature.
Below in conjunction with five specific embodiments to the method for the heat zinc coating plate of the application and corresponding processing heat zinc coating plate into
Row is described in detail.
Embodiment 1:
A kind of automobile tubulose trailing arm steel of 3mm low cost high formability energy, which is characterized in that press mass percentage
Meter has C:0.07%, Si:0.1%, Mn:1.0%, P:0.02%, S:0.006%, Nb:0.015%, Ti:0.015%, V:
0.04%, remaining is Fe and inevitable impurity.
After molten iron and processing, continuous casting obtains slab after converter smelting, RH refining obtain the molten steel of mentioned component；
After slab is heated, hot rolled plate is obtained by roughing, finish rolling, the roughing final temperature control is 1050 DEG C,
The finish rolling final temperature control is 860 DEG C, batches acquisition hot-strip after section cooling under 620 DEG C of coiling temperatures；By institute
State that hot rolled coil is flattened, finished product is obtained after pickling, microscopic metallographic structure is ferrite+pearlite, and tensile strength 560MPa prolongs
Stretch rate A50=29%.
Embodiment 2
Tubing is prepared into through slitting, welding sequence to pickling coiled sheet obtained by embodiment 1.920 DEG C are being carried out just to homogeneous tube
Fire processing keeps the temperature 10min, is slowly cooled to room temperature in air.By the band-like grade of heat-treated steel pipe matrix medium pearlite
Other 1 grade, tensile strength 510MPa, elongation percentage A50=37%, and yield tensile ratio 0.75.The forming property of product is good, process
In do not occur corrugation, cracking phenomena such as, fatigue behaviour is met the requirements.
Embodiment 3:
A kind of automobile tubulose trailing arm steel of 2mm low cost high formability energy, which is characterized in that press mass percentage
Meter has C:0.18%, Si:0.2%, Mn:1.1%, P:0.018%, S:0.005%, Nb:0.02%, Ti:0.02%, V:
0.01%, remaining is Fe and inevitable impurity.
After molten iron and processing, continuous casting obtains slab after converter smelting, RH refining obtain the molten steel of mentioned component；
After slab is heated, hot rolled plate is obtained by roughing, finish rolling, the roughing final temperature control is 1060 DEG C,
The finish rolling final temperature control is 880 DEG C, batches acquisition hot-strip after section cooling under 580 DEG C of coiling temperatures；By institute
State that hot rolled coil is flattened, finished product is obtained after pickling, microscopic metallographic structure is ferrite+pearlite, and tensile strength 570MPa prolongs
Stretch rate A50=28%.
Embodiment 4
Tubing is prepared into through slitting, welding sequence to pickling coiled sheet obtained by embodiment 3.900 DEG C are being carried out just to homogeneous tube
Fire processing keeps the temperature 8min, is slowly cooled to room temperature in air.By the band-like rank of heat-treated steel pipe matrix medium pearlite
1 grade, tensile strength 530MPa, elongation percentage A50=34%, and yield tensile ratio 0.76.The forming property of product is good, in process
Do not occur phenomena such as corrugation, cracking, fatigue behaviour is met the requirements.
Embodiment 5
A kind of automobile tubulose trailing arm steel of 3mm low cost high formability energy, which is characterized in that press mass percentage
Meter has C:0.07%, Mn:0.8%, Nb:0.01%, Ti:0.01%, V:0.01%, remaining is Fe and inevitable impurity.
After molten iron and processing, continuous casting obtains slab after converter smelting, RH refining obtain the molten steel of mentioned component；
After slab is heated, hot rolled plate is obtained by roughing, finish rolling, the roughing final temperature control is 1020 DEG C,
The finish rolling final temperature control is 830 DEG C, batches acquisition hot-strip after section cooling under 500 DEG C of coiling temperatures；By institute
State that hot rolled coil is flattened, finished product is obtained after pickling, microscopic metallographic structure is ferrite+pearlite, and tensile strength 550MPa prolongs
Stretch rate A50=33%, and yield tensile ratio 0.75.
Embodiment 6
Tubing is prepared into through slitting, welding sequence to pickling coiled sheet obtained by embodiment 5.880 DEG C are being carried out just to homogeneous tube
Fire processing keeps the temperature 5min, is slowly cooled to room temperature in air.By the band-like rank of heat-treated steel pipe matrix medium pearlite
0.5 grade, tensile strength 525MPa, elongation percentage A50=36%, and yield tensile ratio 0.75.The forming property of product is good, process
In do not occur corrugation, cracking phenomena such as, fatigue behaviour is met the requirements.
Embodiment 7
A kind of automobile tubulose trailing arm steel of 3mm low cost high formability energy, which is characterized in that press mass percentage
Meter has C:0.25%, Si:0.3%, Mn:1.6%, P:0.02%, S:0.006%, Nb:0.04%, Ti:0.04%, V:
0.04%, remaining is Fe and inevitable impurity.
After molten iron and processing, continuous casting obtains slab after converter smelting, RH refining obtain the molten steel of mentioned component；
After slab is heated, hot rolled plate is obtained by roughing, finish rolling, the roughing final temperature control is 1120 DEG C,
The finish rolling final temperature control is 900 DEG C, batches acquisition hot-strip after section cooling under 650 DEG C of coiling temperatures；By institute
State that hot rolled coil is flattened, finished product is obtained after pickling, microscopic metallographic structure is ferrite+pearlite, and tensile strength 510MPa prolongs
Stretch rate A50=37%, and yield tensile ratio 0.72.
Embodiment 8
Tubing is prepared into through slitting, welding sequence to pickling coiled sheet obtained by embodiment 7.980 DEG C are being carried out just to homogeneous tube
Fire processing keeps the temperature 20min, is slowly cooled to room temperature in air.By the band-like grade of heat-treated steel pipe matrix medium pearlite
Other 0.5 grade, tensile strength 510MPa, elongation percentage A50=34%, and yield tensile ratio 0.76.The forming property of product is good, processed
Do not occur phenomena such as corrugation, cracking in journey, fatigue behaviour is met the requirements.
Finally, it is to be noted that, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of automobile tubulose trailing arm steel, which is characterized in that by weight percentage, the chemical component of the steel are as follows: C:
0.07-0.25%, Si≤0.3%, Mn:0.8-1.6%, P≤0.02%, S≤0.006%, Nb:0.01-0.04%, Ti:
0.01-0.04%, V:0.01-0.04%, remaining is Fe and inevitable impurity；The steel metallographic structure is ferrite+pearly-lustre
Body.
2. a kind of automobile tubulose trailing arm steel according to claim 1, which is characterized in that the tensile strength of the steel >=
540MPa。
3. a kind of automobile tubulose trailing arm steel according to claim 1, which is characterized in that the elongation percentage A of the steel50≥
28%.
4. a kind of preparation method of automobile tubulose trailing arm steel as described in any one of claims 1-3, which is characterized in that packet
Include: molten steel allotment, heating, roughing, finish rolling, section cooling, is batched, smooth and acid pickling step continuous casting, which is characterized in that presses institute
It states chemical component and carries out the molten steel allotment, the roughing final temperature is 1020-1120 DEG C, and the finish rolling final temperature is
830-900 DEG C, the coiling temperature is 500-650 DEG C.
5. using steel pipe made from a kind of automobile tubulose trailing arm steel as described in any one of claims 1-3, which is characterized in that
Band-like rank≤1 grade of steel pipe metallographic structure medium pearlite, tensile strength >=500MPa, and yield tensile ratio≤0.76.
6. steel pipe according to claim 5, which is characterized in that the steel pipe elongation percentage A50>=32%.
7. the preparation method of steel pipe according to claim 5 or 6 characterized by comprising carry out 880-980 to steel pipe
DEG C normalized treatment is air-cooled to room temperature after keeping the temperature 5-20min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910340915.XA CN110129669A (en) | 2019-04-25 | 2019-04-25 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910340915.XA CN110129669A (en) | 2019-04-25 | 2019-04-25 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
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Family
ID=67571106
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| CN101624676A (en) * | 2009-07-15 | 2010-01-13 | 东北大学 | Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof |
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Application publication date: 20190816 |