CN109112401A - A kind of 380MPa grades of titaniferous rim for automobile wheel steel band and its production method - Google Patents
A kind of 380MPa grades of titaniferous rim for automobile wheel steel band and its production method Download PDFInfo
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- CN109112401A CN109112401A CN201811013968.2A CN201811013968A CN109112401A CN 109112401 A CN109112401 A CN 109112401A CN 201811013968 A CN201811013968 A CN 201811013968A CN 109112401 A CN109112401 A CN 109112401A
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- rim
- steel band
- 380mpa
- titaniferous
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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
-
- 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
- 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
- C22C38/14—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
Abstract
The invention discloses a kind of 380MPa grades of titaniferous rim for automobile wheel steel band and its production methods, the steel band chemical component composition and its mass percentage are as follows: C:0.06~0.10%, Si:0.05~0.15%, Mn:0.70~0.90%, P≤0.020%, S≤0.010%, Als:0.020~0.050%, Ti:0.010~0.030%, N≤0.0060%, surplus are Fe and inevitable impurity；The production method includes steel-making, continuous casting, heating, rolling and cooling process.The present invention uses the low manganese of low-carbon, add the ingredient design of a small amount of alloy element Ti and Si, cooling process uses water cooling+air-cooled+water cooling technique, obtain uniform ferrite+pearlitic structrure, improve material plasticity and obdurability, welding performance is improved, the 380MPa grade titaniferous rim for automobile wheel steel band of function admirable is obtained.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 380MPa grades of titaniferous rim for automobile wheel steel band and its production
Method.
Background technique
Wheel is the important component of vehicle carrying, and quality is directly related to the life security of people, although current aluminium alloy
Wheel has gradually captured wheel market with advantages such as light weight, the big, appearance looks elegants of cooling channel amount, but is based on cost consideration, quotient
With vehicle wheel still based on steel wheel, wherein 380MPa grades of wheel steels are that the manufacture of lorry wheel wheel rim is most widely used
Steel grade.
Since automobile rim is in edge rolling and to postwelding, weld seam will be by flaring, rolling forming, expansion etc. be multiple big three times
Process is deformed, therefore very high to welded seam quality requirement.It is raw that cracking of the wheel rim in forming process will result directly in wheel rim
The quality cost of production improves, if tiny breach occur finds the mass defect for easily causing the slow gas leakage of wheel after filling tire not in time,
Influence the service life and safety of wheel.
380MPa grades of wheel steels mostly use carbon manganese ingredient to design at present, and ingredient design can not inhibit in welding process
Crystal grain is grown up, and leads to weld seam position coarse grains after welding, while being influenced by the part Widmannstatten structure that welding generates, weld seam
Plasticity and toughness are below base material, easily crack in subsequent deformation process.
By further improving ingredient design, improvement production technology improves steel band obdurability, improving welding property effect,
It is imperative to obtain the good rim for automobile wheel hot rolled strip of welding performance, and there will be preferable market prospects.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 380MPa grades of titaniferous rim for automobile wheel steel bands；The present invention also mentions
For a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of 380MPa grades of titaniferous rim for automobile wheel
With steel band, the steel band chemical component composition and its mass percentage are as follows: C:0.06~0.10%, Si:0.05~0.15%,
Mn:0.70~0.90%, P≤0.020%, S≤0.010%, Als:0.020~0.050%, Ti:0.010~0.030%, N≤
0.0060%, surplus is Fe and inevitable impurity.
Thickness of strips of the present invention is 6.0~10.0mm.
380~480MPa of steel band tensile strength of the present invention, yield strength >=235MPa, elongation percentage A >=28%, clod wash
Performance meets d=1a, and the d is Bend diameter, and a is thickness of strips, unit mm.
The present invention also provides a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band, the production method packets
Include steel-making, continuous casting, heating, rolling and cooling process；The cooling process, it is air-cooled using water cooling+air-cooled+water cooling technique
6.0~8.0s.
Cooling process of the present invention, carries out first segment water cooling after finish rolling, cooling rate >=50 DEG C/s, it is cooled to 760~
780 DEG C, later in the air-cooled 6.0~8.0s of the temperature range；Second segment water cooling is carried out after air-cooled, cooling rate >=50 DEG C/s are cold
But it is crimped to 600~650 DEG C of coiling temperature.
Steel making working procedure of the present invention, it is blast-melted first through 100t top and bottom combined blown converter smelting, then through 100tLF refining furnace
Refining, tapping ladle chemistry composition and its mass percentage are as follows: C:0.06~0.10%, Si:0.05~0.15%, Mn:
0.70~0.90%, P≤0.020%, S≤0.010%, Als:0.020~0.050%, Ti:0.010~0.030%, N≤
0.0060%, surplus is Fe and inevitable impurity.
Continuous casting working procedure of the present invention, tapping molten steel carry out continuous casting, continuous casting billet wide 900~1450mm, thick 200mm.
Heating process of the present invention, heating of plate blank tapping temperature are 1060~1100 DEG C.
Rolling process of the present invention, slab passes through de-scaling after heating, enters Coil Box, roughing after carrying out five passage roughing
Total reduction control is >=75%.
Rolling process of the present invention carries out seven rack heat and connects finish rolling, finish rolling total reduction control through de-scaling after roughing uncoiling
It is made as >=75%, 990~1030 DEG C of finish rolling start rolling temperature, finishing temperature is 870~910 DEG C.
Rim for automobile wheel of the present invention is hot rolled strip with steel band.
The mechanism and effect that 380Mpa grades of titaniferous rim for automobile wheel steel band chemical composition content of the present invention controls are as follows:
As cheap solution strengthening element, carbon appropriate, manganese element can guarantee the intensity rank of steel for carbon, manganese.But since C contains
Amount is improved and will be adversely affected to the welding performance of material, therefore using the ingredient design of low-carbon, low manganese, the C of material is contained
0.06~0.10%, manganese content is controlled 0.70~0.90% for amount control.
The addition of element silicon can promote the generation of pro-eutectoid ferrite, expand the process window that ferrite generates, in
Between air-cooled section be easier to obtain polygonal ferrite tissue, be conducive to propose high performance stability, but since Si element adds
It excessively will affect the surface quality of material, therefore Si content controlled 0.05~0.15%.
Niobium, vanadium, titanium are the intensified element being most widely used in current steel material, the addition of niobium, vanadium, titanium elements
To play the role of inhibiting Austenite Grain Growth, the present invention is based on considered below using titanium elements: after 1. titanium elements are added
The TiN of precipitation solubility in steel is very low, therefore is not easy back dissolving in the welding process, can effectively inhibit welding heat affected zone
Austenite grain is grown up, and provides condition for the nucleation of polygonal ferrite, is played the role of improving Weld Performance, is improved weld seam
Intensity and toughness, avoid weld seam in forming process from cracking；2. titanium elements relative low price is more advantageous to control product
Cost improves product benefit；3. the addition of titanium elements improving welding property simultaneously, by refine hot rolling microstructure play raising material
Expect the effect of obdurability, therefore can accordingly reduce manganese content, saves cost of alloy.Ti content of the present invention control 0.010~
0.030%。
Phosphorus, element sulphur are the impurity element in steel, and too high levels will cause adverse effect to the fatigue behaviour of wheel steel, because
This preferably reduces P, S constituent content of material as far as possible under the premise of considering cost, and present invention control is P≤0.020%, and S≤
0.010%。
380MPa grades of titaniferous rim for automobile wheel of the present invention strip product canonical reference YB/T 4151-2015；Properties of product inspection
It surveys method standard and refers to Y/BT 4151-2006 " hot-rolled steel plates and sheets used for automobile wheels ".
The beneficial effects of adopting the technical scheme are that the 1, present invention uses low C, low Mn, a small amount of close is added
The ingredient of alloying element Si and Ti design, and cold section of layer uses the technological design of water cooling+air-cooled+water cooling, longer using one
The transfer of intermediate air-cooled section of promotion carbon, manganese element, obtains more pure ferritic structure, improves material plasticity.2, of the invention
The effect realized refinement crystal grain by adding a small amount of Ti element, improve obdurability, improving welding property.3,380MPa of the present invention
Grade titaniferous rim for automobile wheel steel band 380~480MPa of tensile strength, yield strength >=235MPa, elongation percentage A >=28%, clod wash
It is able to satisfy d=1a, d is Bend diameter, and a is thickness of strips, unit mm, and steel band welding performance is good.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of 1 380MPa grades of titaniferous rim for automobile wheel steel band of embodiment.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 7.8mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.061%, Mn:0.88%, S:0.003%, P:0.012%, Si:0.14%, Als:0.040%, Ti:0.028%, N:
0.0028%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.061%, Mn:0.88%, S:0.003%, P:0.012%, Si:0.14%, Als:
0.040%, Ti:0.028%, N:0.0028%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 1150mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1070 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
80%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 80.5%, finish rolling start rolling temperature
1000 DEG C, finishing temperature is 900 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 60 DEG C/s of cooling rate is cooled to 760 DEG C, later in the temperature
The air-cooled 6.0s of range；Second segment water cooling is carried out after air-cooled, 50 DEG C/s of cooling rate is cooled to 620 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Metallographic specimen is acquired, black portions are pearlite, remaining part after the erosion of 4% nitric acid alcohol using optical microscopy
It is divided into ferrite, Fig. 1 is shown in the metallographic structure of steel band.(the metallographic of the 380MPa grade titaniferous rim for automobile wheel steel band in embodiment 2-8
Organization chart is similar with Fig. 1, therefore omits)
Embodiment 2
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 6.7mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.072%, Mn:0.85%, S:0.001%, P:0.009%, Si:0.11%, Als:0.027%, Ti:0.017%, N:
0.0027%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.072%, Mn:0.85%, S:0.001%, P:0.009%, Si:0.11%, Als:
0.027%, Ti:0.017%, N:0.0027%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 1180mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1090 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
80%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 83.25%, finish rolling start rolling temperature
1030 DEG C, finishing temperature is 910 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 50 DEG C/s of cooling rate is cooled to 770 DEG C, later in the temperature
The air-cooled 8.0s of range；Second segment water cooling is carried out after air-cooled, 50 DEG C/s of cooling rate is cooled to 640 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Embodiment 3
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 9.8mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.096%, Mn:0.82%, S:0.003%, P:0.010%, Si:0.12%, Als:0.035%, Ti:0.025%, N:
0.0033%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.096%, Mn:0.82%, S:0.003%, P:0.010%, Si:0.12%, Als:
0.035%, Ti:0.025%, N:0.0033%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 1220mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1060 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
78%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 77.72%, finish rolling start rolling temperature
990 DEG C, finishing temperature is 870 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 60 DEG C/s of cooling rate is cooled to 760 DEG C, later in the temperature
The air-cooled 6.0s of range；Second segment water cooling is carried out after air-cooled, 70 DEG C/s of cooling rate is cooled to 600 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Embodiment 4
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 8.7mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.075%, Mn:0.74%, S:0.004%, P:0.016%, Si:0.07%, Als:0.031%, Ti:0.012%, N:
0.0034%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.075%, Mn:0.74%, S:0.004%, P:0.016%, Si:0.07%, Als:
0.031%, Ti:0.012%, N:0.0034%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 1180mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1070 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
79%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 79.82%, finish rolling start rolling temperature
1010 DEG C, finishing temperature is 880 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 70 DEG C/s of cooling rate is cooled to 770 DEG C, later in the temperature
The air-cooled 7.0s of range；Second segment water cooling is carried out after air-cooled, 80 DEG C/s of cooling rate is cooled to 610 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Embodiment 5
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 6.0mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.083%, Mn:0.72%, S:0.002%, P:0.014%, Si:0.10%, Als:0.029%, Ti:0.014%, N:
0.0028%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.083%, Mn:0.72%, S:0.002%, P:0.014%, Si:0.10%, Als:
0.029%, Ti:0.014%, N:0.0028%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 980mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1100 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
81%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 84.2%, finish rolling start rolling temperature
1020 DEG C, finishing temperature is 910 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 55 DEG C/s of cooling rate is cooled to 780 DEG C, later in the temperature
The air-cooled 6.0s of range；Second segment water cooling is carried out after air-cooled, 60 DEG C/s of cooling rate is cooled to 650 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Embodiment 6
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 7.3mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.090%, Mn:0.77%, S:0.003%, P:0.011%, Si:0.09%, Als:0.032%, Ti:0.021%, N:
0.0037%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.090%, Mn:0.77%, S:0.003%, P:0.011%, Si:0.09%, Als:
0.032%, Ti:0.021%, N:0.0037%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 1270mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1080 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
80%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 81.75%, finish rolling start rolling temperature
1020 DEG C, finishing temperature is 900 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 80 DEG C/s of cooling rate is cooled to 760 DEG C, later in the temperature
The air-cooled 8.0s of range；Second segment water cooling is carried out after air-cooled, 70 DEG C/s of cooling rate is cooled to 630 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Embodiment 7
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 10.0mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.060%, Mn:0.70%, S:0.010%, P:0.020%, Si:0.15%, Als:0.050%, Ti:0.010%, N:
0.0060%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.060%, Mn:0.70%, S:0.010%, P:0.020%, Si:0.15%, Als:
0.050%, Ti:0.010%, N:0.0060%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 1450mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1080 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
75%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 84%, finish rolling start rolling temperature 1010
DEG C, finishing temperature is 880 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 55 DEG C/s of cooling rate is cooled to 770 DEG C, later in the temperature
The air-cooled 7.0s of range；Second segment water cooling is carried out after air-cooled, 60 DEG C/s of cooling rate is cooled to 630 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
Embodiment 8
380MPa grades of titaniferous rim for automobile wheel of the present embodiment are 6.0mm with thickness of strips, and chemical component composition and quality percentage contain
Amount are as follows: C:0.10%, Mn:0.90%, S:0.005%, P:0.010%, Si:0.05%, Als:0.020%, Ti:0.030%, N:
0.0020%, remaining is iron and inevitable impurity.
380MPa grades of titaniferous rim for automobile wheel of the present embodiment steel band production method includes steel-making, continuous casting, heating, rolling and cold
But process, specific process step are as described below:
(1) steel making working procedure: it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, tapping molten steel chemistry at
It is grouped as and its mass percentage are as follows: C:0.10%, Mn:0.90%, S:0.005%, P:0.010%, Si:0.05%, Als:
0.020%, Ti:0.030%, N:0.0020%, remaining is iron and inevitable impurity；
(2) continuous casting working procedure: tapping molten steel carries out continuous casting, continuous casting billet wide 900mm, thick 200mm；
(3) heating process: heating of plate blank tapping temperature is 1090 DEG C；
(4) rolling process: slab passes through de-scaling after heating, enters Coil Box, roughing total reduction after carrying out five passage roughing
85%；Through de-scaling after roughing uncoiling, then carries out seven rack heat and connect finish rolling, finish rolling total reduction 75%, finish rolling start rolling temperature 1010
DEG C, finishing temperature is 900 DEG C；
(5) cooling process: carrying out first segment water cooling after finish rolling, 65 DEG C/s of cooling rate is cooled to 770 DEG C, later in the temperature
The air-cooled 8.0s of range；Second segment water cooling is carried out after air-cooled, 75 DEG C/s of cooling rate is cooled to 640 DEG C and is crimped.
380MPa grades of titaniferous rim for automobile wheel steel bands of the present embodiment prolong the inspection of width direction a quarter position sample from steel band
Physical property is surveyed, testing result is shown in Table 1.
380MPa grades of titaniferous rim for automobile wheel steel band performance test results in 1 embodiment 1-8 of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (10)
1. a kind of 380MPa grades of titaniferous rim for automobile wheel steel band, which is characterized in that the steel band chemical component composition and its quality
Percentage composition are as follows: C:0.06~0.10%, Si:0.05~0.15%, Mn:0.70~0.90%, P≤0.020%, S≤0.010%,
Als:0.020~0.050%, Ti:0.010~0.030%, N≤0.0060%, surplus are Fe and inevitable impurity.
2. a kind of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 1, which is characterized in that the steel band is thick
Degree is 6.0~10.0mm.
3. a kind of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 1, which is characterized in that the steel band is anti-
380~480MPa of tensile strength, yield strength >=235MPa, elongation percentage A >=28%, cold-bending property meet d=1a, and the d is flexual center
Diameter, a are thickness of strips, unit mm.
4. based on a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band described in claim 1-3 any one,
It is characterized in that, the production method includes steel-making, continuous casting, heating, rolling and cooling process；The cooling process, using water
The technique of cold+air-cooled+water cooling, air-cooled 6.0~8.0s.
5. a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 4, which is characterized in that
The cooling process carries out first segment water cooling after finish rolling, cooling rate >=50 DEG C/s are cooled to 760~780 DEG C, later at this
Air-cooled 6.0~the 8.0s of temperature range；Second segment water cooling is carried out after air-cooled, cooling rate >=50 DEG C/s are cooled to coiling temperature 600
~650 DEG C.
6. a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 4, which is characterized in that
The steel making working procedure, it is blast-melted first through top and bottom combined blown converter smelting, then refined through LF refining furnace, ladle chemistry group of tapping
At and its mass percentage are as follows: C:0.06~0.10%, Si:0.05~0.15%, Mn:0.70~0.90%, P≤0.020%, S
≤ 0.010%, Als:0.020~0.050%, Ti:0.010~0.030%, N≤0.0060%, surplus be Fe and inevitably it is miscellaneous
Matter.
7. a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 4-6 any one,
It is characterized in that, the continuous casting working procedure, tapping molten steel carries out continuous casting, continuous casting billet wide 900~1450mm, thick 200mm.
8. a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 4-6 any one,
It is characterized in that, the heating process, heating of plate blank tapping temperature is 1060~1100 DEG C.
9. a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 4-6 any one,
It is characterized in that, the rolling process, slab passes through de-scaling after heating, enters Coil Box after carrying out five passage roughing, roughing is total
Reduction ratio control is >=75%.
10. a kind of production method of 380MPa grades of titaniferous rim for automobile wheel steel band according to claim 4-6 any one,
It is characterized in that, then the rolling process carries out seven rack heat and connects finish rolling, finish rolling total reduction through de-scaling after roughing uncoiling
Control is >=75%, and 990~1030 DEG C of finish rolling start rolling temperature, finishing temperature is 870~910 DEG C.
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| CN201811013968.2A CN109112401B (en) | 2018-08-31 | 2018-08-31 | Steel strip for 380 MPa-grade titanium-containing wheel rim and production method thereof |
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| CN201811013968.2A CN109112401B (en) | 2018-08-31 | 2018-08-31 | Steel strip for 380 MPa-grade titanium-containing wheel rim and production method thereof |
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| CN109797351A (en) * | 2019-01-17 | 2019-05-24 | 武汉钢铁有限公司 | A kind of cold forming 16mm thickness tubeless rim steel and production method |
| CN114959445A (en) * | 2022-04-01 | 2022-08-30 | 宁波钢铁有限公司 | Steel for anti-transverse-fracture easy-welding rim and production method thereof |
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