CN104532133A - 550MPa-grade hot rolled steel for wheel rims and manufacturing method of hot rolled steel - Google Patents
550MPa-grade hot rolled steel for wheel rims and manufacturing method of hot rolled steel Download PDFInfo
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Abstract
The invention belongs to the technical field of smelting, relates to steel for wheel rims, and further relates to steel for wheel rims and a manufacturing method of the steel. The hot rolled steel for wheel rims is characterized by consisting of the following components in percentage by mass: 0.05-0.09% of C, 0.01-0.30% of Si, 0.80-1.20% of Mn, 0.02-0.06% of Alt, 0.20-0.60% of Cr, 0.008-0.03% of Ti, 0.03-0.06% of P, less than or equal to 0.005% of S, less than or equal to 0.006% of N, and the balance of Fe and inevitable impurities. The hot rolled steel for wheel rims manufactured by the method disclosed by the invention is less than 0.80 in yield ratio, suitable for the roll forming of the wheel rims, and is excellent in forming and welding properties. The steel sheet disclosed by the invention, during using, can be adapted to the production and processing of wheels of automobiles, in particular commercial vehicles, requiring high strength and high fatigue property.
Description
Technical field
The invention belongs to technical field of smelting, relate to a kind of wheel rim steel, also relate to the manufacture method of above-mentioned hot rolled wheel rim steel.
Background technology
China's auto output 2,211 ten thousand in 2013, keeps the first in the world in continuous 5 years.Along with being becoming tight energy day, environmental stress increasingly sharpens, and adds constantly perfect to legislative work for protecting environment of the whole world, facilitates automotive technology development center of gravity towards energy-saving and environmental protection and the development of security aspect.Use modern technologies and method to alleviate the weight of component or car load, under the prerequisite of performances such as ensuring safety, realizing energy-saving and emission-reduction consumption reduction target by loss of weight becomes common recognition.
Wheel is one of parts of key in automobile industry, have and turn to, carry and the function such as braking, particularly commercial vehicle wheel, it affects by Land leveling degree in the process of running up, usually alternation mechanical stress, road shocks load is born, and the local temperature stress that inertia braking causes, these drastically influence the work-ing life of wheel.High-intensity rim steel has become an important automobile steel kind.As material used for automobile wheels, wheel rim steel must have enough intensity, good forming property and welding property, at present, domestic commercial vehicle rim material is mainly based on 380CL, 420CL and 490CL steel, and 540MPa and other high-intensity rim steel of higher level thereof start application on passenger car wheel rim, because yield tensile ratio is higher, only have part equipment and the higher material for rolling wheel production line of production technique level to start research and development, it is restricted in the application aspect of commercial car wheel rim.
CN102586678 A discloses a kind of Wheel steel for high-strength long-fatigue-life heavy-duty truck and treatment process thereof, belongs to heavy load truck Wheel Steel technical field.This Wheel Steel Chemical Composition by weight percentage ratio is: C:0.05-0.30%, Si:0.01-0.06%, Mn:0.50-2.0%, Ni≤1.5%, Mo:0.01-0.20%, V:0.01-0.20%, Nb:0.01-0.20%, Ti:0.01-0.20%, Al:0.01-0.20%, P+S≤0.02%, surplus is Fe and inevitable trace impurity, belong to low carbon low silicon niobium, titanium (vanadium) microalloyed steel, this steel grade production cost is higher, especially the yield tensile ratio of wheel rim steel is high, wheel rim process for processing difficulty is larger, flash welding processing requirement is high, treatment process after optimizing by it, enlarging cracking rate can only be reduced to less than 4%, affect larger on production efficiency and manufacturing cost.
CN101724777 A a kind of tensile strength of openly knowing clearly is hot rolled wheel rim steel and the manufacture method thereof of 550MPa level, the chemical composition mass percent of described wheel rim steel is, C:0.02% ~ 0.07%, Si:0 ~ 0.3%, Mn:0.8% ~ 1.2%, P≤0.035%, S≤0.005%, Al:0.025% ~ 0.060%, N≤0.0060%, Nb:0 ~ 0.10%; All the other are Fe and inevitable impurity.Belong to Nb microalloyed steel, require to process on the special high-strength steel wheel rim production line that equipment is higher, for the processing of passenger car Thin Specs wheel rim (particularly below 4mm), because steel plate yield tensile ratio is generally more than 0.85, be not suitable for the processing and manufacturing of think gauge commercial car wheel rim.
Japanese documentation JP56130455A discloses a kind of hot rolling high-strength plate, and containing Ca and Ce in its composition, intensity reaches 560-580MPa, and unit elongation is 27%, and yield tensile ratio is higher, and the processing and manufacturing of think gauge wheel rim is also restricted; Japanese documentation JP57035663A discloses a kind of hot rolling high-strength plate and manufacture method thereof, belong to low-carbon high-manganese Nb-Ti micro-alloyed steel, adopt the retarded cooling process of 10-20 DEG C/s, F+B two-phase microtexture is defined in steel, production cost is higher, is also unsuitable for the production line that hot roller repairing line length is shorter; Japanese documentation JP57155347A provides a kind of hot rolling high-strength plate, and measuring containing C in its composition is 0.067 ~ 0.082%, is 1.52 ~ 1.70%, but does not relate to hot rolling and process for cooling containing Mn amount; The hot rolling high-strength plate that Japanese documentation JP57155348A provides, measuring containing C in its composition is 0.09 ~ 0.10%, is 1.25 ~ 1.36%, adds the composition of rare earth in the composition of steel containing Mn amount; The hot rolling high-strength plate of Japanese documentation JP59035653A, adopts the higher Mn that contains to measure (1.20-1.88%) and higher Si(0.27-0.81%) content, manufacturing cost is higher, and quality control on the surface difficulty is large.In addition according to the composition characteristic of this several hot rolling high-strength plate, if controlling of production process is improper, easily in think gauge commercial car wheel rim rolling process, there is crack defect at wheel rim end face.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides the suitable wheel rim rolling forming processing below 0.80 of a kind of yield tensile ratio, the hot rolled wheel rim steel of shaping and the excellent 550MPa level of welding property;
Present invention also offers its manufacture method of above-mentioned hot rolled wheel rim steel.
The present invention is on the basis of C-Mn composition of steel, strict control C and Mn content, reduce Si content, appropriate interpolation Cr and P, does not add Nb, V microalloy element, also the precious alloys such as Mo, Ni are not added, only carry out micro-Ti process, significantly reduce cost, adopt specific cooling controlling and rolling controlling process, obtain the hot rolled wheel rim steel of tensile strength 550MPa level, be suitable for the processing of commercial car wheel rim.Its main chemical compositions by mass percent is: 0.05 ~ 0.09%C, 0.01 ~ 0.30%Si, 0.80 ~ 1.20%Mn, 0.02 ~ 0.06%Alt, 0.20 ~ 0.6%Cr, 0.008-0.03%Ti, 0.03 ~ 0.06%P, S≤0.005%, N≤0.006%, surplus is Fe and inevitable impurity; Ferrite volume fraction is 65 ~ 85%, and bainite volume fraction is 10-30%, and other tissue volume mark such as martensite is less than 10%.
In the present invention, each alloys producing is as follows:
C: the important element of intensity improving steel, C content too low martensitic ratio is crossed low strength and is not reached requirement, and C content is too high, and ferrite is difficult to be formed, and welding property and forming property worsen simultaneously.
Si: deoxidant element, plays solution strengthening effect simultaneously in steel, and the too high surface of steel plate that easily makes of content produces " red rust " defect, affects the fatigue property of surface quality and final final product.
Mn: improve hardening capacity is also important solution strengthening element, the too low undercapacity causing body body stability difficult to understand and steel, and too high meeting makes the plasticity of steel and weldability decline.
S: the impurity element in steel, comparatively large to plasticity and Influence of Fatigue Properties, content is more low better.
P: solution strengthening element, adds appropriate P and can promote ferritic generation and keep intensity and moulding well balanced.
Cr: the element improving hardening capacity, is conducive to austenitic stable, too high, is difficult to be formed the ferrite of enough volume fractions and then causes ductility deteriorates.
AL: deoxidant element, can reduce the oxide inclusion in steel and pure steel, is conducive to the forming property improving steel plate; Too high levels will cause ductility deteriorates.
Ti: the element of crystal grain thinning, raising intensity and toughness, preferential nitrogen in steel is combined, and exists with the form of carbide and carbonitride.
In above-mentioned chemical composition, Mn/Si > 3, preferred Mn/Si > 4.
The manufacture method of the hot rolled wheel rim steel of above-mentioned 550MPa level, comprises following step: hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling, wherein hot continuous rolling comprises heating, rolling, cools and batch.
The manufacture method of the hot rolled wheel rim steel of above-mentioned 550MPa level, hot continuous rolling specifically comprises the following steps:
(1) heating process: by the heating of plate blank of thickness 70 ~ 250mm to 1150 ~ 1250 DEG C, soaking time 1-3 hour.
(2) rolling technology: adopt two-stage control rolling, rough rolling step single pass draft >=20%, total reduction is >=70%, and finish rolling stage draft is >=75%; Rough rolling step start rolling temperature is 1100 ~ 1150 DEG C, finishing temperature 1000 ~ 1100 DEG C, and finish rolling stage start rolling temperature is 950 ~ 1050 DEG C, and finishing temperature is 800 ~ 880 DEG C;
(3) process for cooling: the sectional type cooling path control techniques of rolling rear employing first stage water-cooled+air cooling+subordinate phase water-cooled, first stage water-cooled section speed of cooling is 20 ~ 100 DEG C/s, be cooled to 650 ~ 750 DEG C, then air cooling 1-5s, subordinate phase water-cooled section speed of cooling is 20 ~ 100 DEG C/s, is cooled to 200-400 DEG C;
(4) coiling technique: coiling temperature 200-400 DEG C, preferred 300-400 DEG C, finished product thickness is 4 ~ 8mm.
Preferably, hot continuous rolling step is as follows: (1) heating process: by the heating of plate blank of thickness 70 ~ 250mm to 1200 DEG C, soaking time 2 hours;
(2) rolling technology: adopt two-stage control rolling, rough rolling step single pass draft >=20%, total reduction is >=70%, and finish rolling stage draft is >=75%; Rough rolling step start rolling temperature is 1125 DEG C, finishing temperature 1050 DEG C, and finish rolling stage start rolling temperature is 1000 DEG C, and finishing temperature is 850 DEG C;
(3) process for cooling: the sectional type cooling path control techniques of rolling rear employing first stage water-cooled+air cooling+subordinate phase water-cooled, first stage water-cooled section speed of cooling is 60 DEG C/s, is cooled to 700 DEG C, then air cooling 3s, subordinate phase water-cooled section speed of cooling is 60 DEG C/s, is cooled to 300 DEG C;
(4) coiling technique: coiling temperature 300 DEG C, finished product thickness is 6mm.
A kind of hot rolled wheel rim steel yield tensile ratio of low cost 550MPa level that the present invention produces below 0.80, suitable wheel rim rolling forming processing, be shaped and welding property excellent.When using steel plate of the present invention, the process for processing of the automobile that can adapt to require high strength and high fatigue property especially commercial vehicle wheel.
Beneficial effect of the present invention is, the hot rolled wheel rim steel yield tensile ratio adopting method of the present invention to manufacture below 0.80, suitable wheel rim rolling forming processing, be shaped and welding property excellent.When using steel plate of the present invention, the process for processing of the automobile that can adapt to require high strength and high fatigue property especially commercial vehicle wheel.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, so that those skilled in the art more understands the present invention, but does not therefore limit the present invention.
Embodiment 1
A manufacture method for the hot rolled wheel rim steel of low cost 550MPa level, comprises hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling.Hot continuous rolling process is: slab thickness 135mm, Heating temperature 1180 DEG C, soaking time 2h, roughing start rolling temperature 1140 DEG C, finishing temperature 1060 DEG C, 3 passes become the intermediate blank of 33mm, finish rolling stage start rolling temperature 1030 DEG C, finishing temperature 870 DEG C, is then chilled to 736 DEG C with the cooling rate of 58 DEG C/S, air cooling 5S, again with 52 DEG C/S water-cooled to target coiling temperature, coiling temperature is 376 DEG C, steel plate finished product thickness 4mm.
Embodiment 2
A hot rolled wheel rim steel for low cost 550MPa level, its chemical composition is in table 1.
A manufacture method for the hot rolled wheel rim steel of low cost 550MPa level, comprises hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling.Hot continuous rolling process is: slab thickness 135mm, Heating temperature 1160 DEG C, soaking time 2.5h, roughing start rolling temperature 1110 DEG C, finishing temperature 1040 DEG C, 3 passes become the intermediate blank of 33mm, finish rolling stage start rolling temperature 1010 DEG C, finishing temperature 860 DEG C, is then chilled to 728 DEG C with the cooling rate of 59 DEG C/S, air cooling 3S, again with 68 DEG C/S water-cooled to target coiling temperature, coiling temperature is 342 DEG C, steel plate finished product thickness 4.5mm.
Embodiment 3
A hot rolled wheel rim steel for low cost 550MPa level, its chemical composition is in table 1.
A manufacture method for the hot rolled wheel rim steel of low cost 550MPa level, comprises hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling.Hot continuous rolling process is: slab thickness 135mm, Heating temperature 1230 DEG C, soaking time 1.5h, roughing start rolling temperature 1150 DEG C, finishing temperature 1070 DEG C, 3 passes become the intermediate blank of 36mm, finish rolling stage start rolling temperature 1020 DEG C, finishing temperature 840 DEG C, is then chilled to 668 DEG C with the cooling rate of 42 DEG C/S, air cooling 3S, again with 38 DEG C/S water-cooled to target coiling temperature, coiling temperature is 313 DEG C, steel plate finished product thickness 6.0mm.
Embodiment 4
A hot rolled wheel rim steel for low cost 550MPa level, its chemical composition is in table 1.
A manufacture method for the hot rolled wheel rim steel of low cost 550MPa level, comprises hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling.Hot continuous rolling process is: slab thickness 135mm, Heating temperature 1200 DEG C, soaking time 2.0h, roughing start rolling temperature 1130 DEG C, finishing temperature 1060 DEG C, 3 passes become the intermediate blank of 34mm, finish rolling stage start rolling temperature 1020 DEG C, finishing temperature 860 DEG C, is then chilled to 692 DEG C with the cooling rate of 49 DEG C/S, air cooling 5S, again with 46 DEG C/S water-cooled to target coiling temperature, coiling temperature is 297 DEG C, steel plate finished product thickness 5.0mm.
Embodiment 5
A hot rolled wheel rim steel for low cost 550MPa level, its chemical composition is in table 1.
A manufacture method for the hot rolled wheel rim steel of low cost 550MPa level, comprises hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling.Described hot continuous rolling process is: slab thickness 135mm, Heating temperature 1210 DEG C, soaking time 2.0h, roughing start rolling temperature 1110 DEG C, finishing temperature 1020 DEG C, 3 passes become the intermediate blank of 38mm, finish rolling stage start rolling temperature 980 DEG C, finishing temperature 820 DEG C, is then chilled to 698 DEG C with the cooling rate of 32 DEG C/S, air cooling 1S, again with 26 DEG C/S water-cooled to target coiling temperature, coiling temperature is 248 DEG C, steel plate finished product thickness 8.0mm.
The chemical composition of table 1 embodiment
The mechanical property of the hot rolled wheel rim steel of embodiment 1 ~ 5 is as shown in table 2.
The mechanical property of table 2 embodiment
Note: tensile test specimen scale distance is 50mm.
industrial production exploitativeness
As seen from the above embodiment, the hot rolled wheel rim steel cost of a kind of low cost 550MPa level of the present invention is lower, weldability and rolling forming better, the wheel rim of suitable automobile commercial car steel wheel is produced, manufacture method of the present invention all can realize on most hot continuous rolling production line, large industrial production is workable, is easy to produce.
Claims (9)
1. the hot rolled wheel rim steel of a 550MPa level, it is characterized in that, the component of following mass percent drawn together by described ladle: C 0.05 ~ 0.09%, Si 0.01 ~ 0.30%, Mn 0.80 ~ 1.20%, Alt 0.02 ~ 0.06%, Cr 0.20 ~ 0.6%, Ti 0.008-0.03%, P 0.03 ~ 0.06%, S≤0.005%, N≤0.006%, surplus is Fe and inevitable impurity.
2. the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 1, is characterized in that, described Mn/Si > 3.
3. the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 1, is characterized in that, in described steel, ferrite volume fraction is 65 ~ 85%, and bainite volume fraction is 10-30%, and other tissue volume mark such as martensite is less than 10%.
4. the manufacture method of the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 1, comprises following step:
Hot metal pretreatment-converter smelting-LF-continuous casting-hot continuous rolling, it is characterized in that, described hot continuous rolling comprises heating, rolling, cools and batch.
5. the manufacture method of the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 4, is characterized in that, in described heating steps: by the heating of plate blank of thickness 70 ~ 250mm to 1150 ~ 1250 DEG C, soaking time 1-3 hour.
6. the manufacture method of the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 4, it is characterized in that, in described milling step: adopt two-stage control rolling, rough rolling step single pass draft >=20%, total reduction is >=70%, and finish rolling stage draft is >=75%; Rough rolling step start rolling temperature is 1100 ~ 1150 DEG C, finishing temperature 1000 ~ 1100 DEG C, and finish rolling stage start rolling temperature is 950 ~ 1050 DEG C, and finishing temperature is 800 ~ 880 DEG C.
7. the manufacture method of the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 4, it is characterized in that, in described cooling step: the sectional type cooling path control techniques of rolling rear employing first stage water-cooled+air cooling+subordinate phase water-cooled, first stage water-cooled section speed of cooling is 20 ~ 100 DEG C/s, be cooled to 650 ~ 750 DEG C, then air cooling 1-5s, subordinate phase water-cooled section speed of cooling is 20 ~ 100 DEG C/s, is cooled to 200-400 DEG C.
8. the manufacture method of the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 4, is characterized in that, described batches in step: coiling temperature 200-400 DEG C, and finished product thickness is 4 ~ 8mm.
9. the manufacture method of the hot rolled wheel rim steel of a kind of 550MPa level as claimed in claim 4, comprises following step:
(1) heating process: by the heating of plate blank of thickness 70 ~ 250mm to 1200 DEG C, soaking time 2 hours;
(2) rolling technology: adopt two-stage control rolling, rough rolling step single pass draft >=20%, total reduction is >=70%, and finish rolling stage draft is >=75%; Rough rolling step start rolling temperature is 1125 DEG C, finishing temperature 1050 DEG C, and finish rolling stage start rolling temperature is 1000 DEG C, and finishing temperature is 850 DEG C;
(3) process for cooling: the sectional type cooling path control techniques of rolling rear employing first stage water-cooled+air cooling+subordinate phase water-cooled, first stage water-cooled section speed of cooling is 60 DEG C/s, is cooled to 700 DEG C, then air cooling 3s, subordinate phase water-cooled section speed of cooling is 60 DEG C/s, is cooled to 300 DEG C;
(4) coiling technique: coiling temperature 300 DEG C, finished product thickness is 6mm.
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| CN106834915A (en) * | 2016-12-06 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | 800MPa grades of hot-rolled dual-phase steel of 2 ~ 4mm thickness and its processing method |
| CN107587054A (en) * | 2017-09-06 | 2018-01-16 | 河钢股份有限公司承德分公司 | A kind of low-carbon-equivalent easily welds 380CL wheel rims steel and its production method |
| CN109112401A (en) * | 2018-08-31 | 2019-01-01 | 唐山钢铁集团有限责任公司 | A kind of 380MPa grades of titaniferous rim for automobile wheel steel band and its production method |
| CN112458358A (en) * | 2020-10-26 | 2021-03-09 | 首钢集团有限公司 | 500 MPa-grade hot-rolled phase-change reinforced steel and preparation method and application thereof |
| CN112779401A (en) * | 2019-11-07 | 2021-05-11 | 上海梅山钢铁股份有限公司 | High-reaming hot-rolled pickled steel plate with yield strength of 550MPa |
| CN115125432A (en) * | 2022-06-13 | 2022-09-30 | 本钢板材股份有限公司 | Manufacturing method of 650 MPa-grade high-strength and light-weight steel for automobile spoke |
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| CN112458358B (en) * | 2020-10-26 | 2022-03-22 | 首钢集团有限公司 | 500 MPa-grade hot-rolled phase-change reinforced steel and preparation method and application thereof |
| CN115125432A (en) * | 2022-06-13 | 2022-09-30 | 本钢板材股份有限公司 | Manufacturing method of 650 MPa-grade high-strength and light-weight steel for automobile spoke |
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Application publication date: 20150422 |