CN109797336A - The tubeless rim steel and production method of a kind of thickness in 9 ~ 11mm - Google Patents
The tubeless rim steel and production method of a kind of thickness in 9 ~ 11mm Download PDFInfo
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Abstract
A kind of thickness is in 9 ~ 11mm thickness tubeless rim steel, component and wt% are as follows: C:0.040~0.063%, Si:0.045~0.100%, Mn:0.35~0.70%, P :≤0.006%, S :≤0.005%, O :≤0.0020%, N :≤0.0030%, Als:0.035~0.065%；Production method: enter LF furnace after converter smelting and refine；RH application of vacuum；Continuous casting simultaneously heats slab；Roughing；Finish rolling；Carry out ultra-rapid cooling；It batches；It is smooth.The present invention not only guarantees thickness specification in 9 ~ 11mm, material lower yield strength >=275MPa, 370 ~ 470MPa of tensile strength, elongation percentage A50>=40%, Impact energy Ak v >=175J under the conditions of -20 DEG C, material is after flash butt welding, 180 ° of lateral sample, and Bend diameter d=0a is qualified, makes fatigue strength >=140MPa, and cold forming precision is high, and qualification rate improves at least 5%.
Description
Technical field
The present invention relates to a kind of hot-rolled steel and production method, belong to a kind of tubeless rim steel and production method, definitely
For a kind of thickness 9~11mm tubeless rim steel and production method.
Background technique
The structure of wheel mainly includes spoke and wheel rim, and the production method of spoke is generally mechanical stamping forming, so wanting
Ask spoke wheel steel that there is good deep drawability, stretch forming performance and sheared edge tensile property.Wheel rim is then to glisten
Butt welding and then rolling forming, therefore it is required that wheel rim wheel steel has good welding performance, postwelding forming property, it is such as cold
Curved performance, fatigue behaviour etc., tubeless rim wheel steel is in order to guarantee the air-tightness of finished tire, to the surface quality of material
Harsher requirement is proposed with dimensional accuracy.
Now, the exploitation of all kinds of mineral resources, the construction of engineering project provide substance base for the good life of the mankind
Plinth also greatly have stimulated the demand of engineering machinery vehicle, self-tipping type mine car, due to special working environment and work shape
State, engineering machinery vehicle wheel, mine car wheel have the characteristics that volume is big, quality weight, forming complexity, generally use think gauge
Hot-rolled steel manufacture, due to the limitation of material thickness and intensity, substantially increases and shapes difficulty, therefore is forced using hot-working
Mode manufactured, which results in the increase of the increase of process and energy consumption, improve manufacturing cost, and heated
Due to oxidation in journey, the factors such as tissue change change the forming property of material, and product defects rate improves, greatly
Affect economic benefit.On the other hand, hot-working generates a large amount of iron scale dust and thermal radiation phenomena, brings to environment
Serious pollution, this is disagreed with environmentally protective, energy-saving idea of development.Therefore, produce it is a kind of meet cold forming use
Hot rolling wheel steel, and can satisfy engineering machinery vehicle inner tube-free wheel rim steel, self-tipping type mine car inner tube-free wheel wheel
Rim steel applying working condition requirement, is the key point solved the problems, such as.
Through retrieving:
China Patent Publication No. is a kind of 201711156024.6 invention of the CN good thin rule of high intensity of anti-fatigue performance
Lattice wheel-use steel material, ingredient are C:0.05~0.07%, Si:0.15~0.30%, Mn:1.40~1.60%, P :≤
0.008%, S :≤0.002%, Als:0.020~0.060%, Nb:0.046~0.055%, remaining is for Fe and inevitably
Impurity.Manufacturing process carries out refining and Ca processing to enter LF furnace after converter smelting, is casting continuously to form after base to slab heating rolling, adopts
Cool down with the preceding fast rear slow type of cooling and batch, carry out finishing and rear process, which is added to Nb, Mn constituent content
It is relatively high, therefore manufacturing cost is also high, and product produced by the invention belongs to thin slab product, therefore limits product
Use scope, it is impossible to meet the requirements of off-highway wheel steel.
China Patent Publication No. be a kind of think gauge truck spoke steel of CN 201610392108.9 invention and its
Preparation method, ingredient be C:0.07~0.10%, Si:0.01~0.20%, Mn:0.85~1.00%, P:0.01%~
0.025%, S:0.01%~0.015%, Als:0.010~0.050%, remaining is Fe and inevitable impurity.Manufacture work
Skill be desulfurizing iron → converter smelting top-bottom blowing → deoxidation, after alloying → furnace chain-wales mend feed Al line → LF refining heating →
Continuous casting → heating of plate blank → high-pressure water descaling → roughing → Coil Box batches → finish rolling → section cooling → and batches → weld end to end
→ pickling → trimming → oiling → finished product.The invention is a kind of spoke special-purpose steel, and C content is relatively high, and S, P etc. are harmful miscellaneous
Matter is higher, and to the fatigue behaviour of material, the service performances such as forming property are adversely affected.
Tubeless rim steel produced by the invention has excellent forming property, shock resistance and fatigue behaviour, for
Think gauge large size wheel rim forming at this stage can only defect Jing Guo thermoforming, tubeless rim steel produced by the invention can be with
Power consumption of polymer processing and cost thus greatly reduces in cold machine-shaping, reduces environmental pollution, and in nothing produced by the invention
The excellent impact resistance that tire wheel rim steel has can be the indispensable item for coping with the working condition requirement of off-highway wheel cruelty with fatigue behaviour
Part solves the problems, such as that road vehicle wheel steel is unable to satisfy cruel operating condition requirement at this stage.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, one kind is provided and is guaranteeing 9~11mm of thickness specification,
Material lower yield strength >=275MPa, 370~470MPa of tensile strength, elongation percentage A50>=40%, ballistic work under the conditions of -20 DEG C
Akv>=175J, material is after flash butt welding, 180 ° of lateral sample, and Bend diameter d=0a is qualified, makes fatigue strength >=140MPa,
Cold forming precision is high, and qualification rate improves at least 5% thickness in the tubeless rim steel and production method of 9~11mm.
Realize the measure of above-mentioned purpose:
A kind of thickness is in 9~11mm thickness tubeless rim steel, component and weight percent content are as follows: and C:0.040~
0.063%, Si:0.045~0.100%, Mn:0.35~0.70%, P :≤0.006%, S :≤0.005%, O :≤
0.0020%, N :≤0.0030%, Als:0.035~0.065%, surplus are Fe and inevitable impurity.
A kind of method of thickness in 9~11mm thickness tubeless rim steel is produced, step:
1) enter LF furnace after converter smelting and carry out external refining；
2) RH application of vacuum is carried out；At the end of control is vacuum-treated, P≤0.008% in molten steel, S≤0.005%, very
The time is managed not less than 20min in vacancy；；Calcium treatment is carried out after trimming, and feeds Si-Ca according to 650~850g/ tons of steel
Line,
Rate control is fed in 260~320m/min；
3) it is casting continuously to form base to heat slab, heating and temperature control is at 1170~1230 DEG C；
4) roughing is carried out, and control it to terminate temperature at 1040~1080 DEG C；
5) finish rolling is carried out, and controls finishing temperature at 810~840 DEG C；
6) ultra-rapid cooling is carried out, is cooled to coiling temperature in the case where cooling velocity is 160~200 DEG C/s；
7) batched: control coiling temperature is at 510~540 DEG C；
8) smooth: smooth power is set as 2.0%~2.5%.
It is: the ingredient and weight percent content of LF Slag Regime In Conditions of Out-of-furnace Steel Treatment are as follows: CaO:50%~55%,
Al2O3: 25%~28%, MgO:6%~8%, SiO2: 9%~12%, TFe < 0.6%, and the basicity R of control clinker:
4.0~4.5.
In the present invention the reasons why effect and control of each component and main technique:
Carbon: being the very good and cheap solution strengthening element of invigoration effect, and influences the main of steel material obdurability
Element, intensity can be improved in carbon increase, but reduces toughness, and the welding performance to material is also unfavorable.Because this patent steel grade
Application range is engineering machinery vehicle inner tube-free wheel rim part, needs to carry out largely Pressing Deformation and processes, and
In order to energy-saving, avoid heat processing technique process, reduce heating furnace equipment and energy consumption cost, therefore it is required that material meet it is strong
While degree requires, it is necessary to have good cold formability energy.If carbon content is greater than 0.063%, it is not able to satisfy material
Good cold formability energy, and carbon content is less than 0.040%, it is impossible to meet the intensity requirements of material for side.So carbon content is limited
It is scheduled on 0.040~0.063% range.
Silicon: silicon has very strong solution strengthening effect after being dissolved in ferrite, 0.1% weight percent of every increase in carbon steel
Silicon, can make the tensile strength of hot-rolled steel improve 8.0Mpa~9.0Mpa, and yield strength improves 4.0Mpa~5.0Mpa.And micro Si
The addition of element when making wheel rim part flash butt welding, reduces the fusing point of the impurity such as aluminium oxide, forms lower melting-point silicate oxygen
Compound makes it quickly form welding slag, and removes in process of skimming, to improve the weldquality of wheel rim, guarantee material it is cold at
Shape requirement, but silicone content is more than that 0.2% later adversely affects to toughness and surface quality significantly increases, and especially makes hot-rolled steel
Plate generates red iron sheet, leaves point in surface of steel plate after pickling, becomes the formation of crack of Wheel Fatigue process, therefore the present invention is set
Fixed Si content is 0.045%~0.100%.
Manganese: manganese is to improve intensity and the most effective element of toughness, proposes the hardness and strength of ferrite and austenite in steel
It is high；Critical transition temperature in steel is reduced, plays the role of refining pearlite, also improves the work of pearlitic steel intensity indirectly
With；But the violent of volume is added, can have an adverse effect to the component segregation of product；It is simultaneously also to improve weld crack sensitivity system
Several elements.Therefore manganese content is limited to 0.35~0.70% range.
Phosphorus: in order to avoid P elements deteriorate the cold stamping forming property, toughness, fatigue behaviour of material, it is set
Upper content limit is 0.006%, so by the control of its content below 0.006%.
Sulphur: sulphur is very harmful element.Sulphur in steel often exists with the oxide morphology of manganese, this sulphide inculsion pair
The fatigue behaviour of steel is unfavorable, need to control sulfur content in steel more lower better.Therefore, sulfur content control in steel is existed
0.005% or less
Aluminium: being added a small amount of aluminium, can refine crystal grain, improves impact flexibility, it is strong oxygen that aluminium, which can also play the role of deoxidation,
The property changed formation element, He Gangzhong oxygen form Al2O3It is removed in steel-making.Aluminium is excessively high to be will form the excessive Al heart and is mingled with, and the Al heart is mingled with
Rim for automobile wheel steel fatigue behaviour is damaged greatly, rim for automobile wheel, which must be mingled with the Al heart with steel, to be controlled.Therefore, this hair
The bright Als content that limits is 0.035~0.065%.
Oxygen, nitrogen: strict control element seriously affects rim for automobile wheel use to hot-rolled steel coiled sheet tissue, performance and its unfavorable
Steel bursts rate and micro-crack rate.Therefore, the present invention limits oxygen content O :≤0.0020%, nitrogen content N :≤0.0030%.
It is required according to the characteristics of finished-product material, why the ingredient and content of clinker is carried out during LF external refining
Control, and make its basicity in R:4.0~4.5；During LF external refining, influence of the basicity to sulfur partition ratio is the brightest
It is aobvious, and have a great impact to the viscosity of slag.Basicity R value is controlled, the desulphurizing ability for improving clinker is conducive to, it can be more effective
Carry out desulfurization, improve the application performances such as the mechanics of material, such as fatigue behaviour, shock resistance, but can make slag have close
The viscosity of reason improves the dischargeable capacity of ladle, reduces damage of the souring to ladle liner, reduces production cost, increases
Production efficiency and benefit.
RH furnace is vacuum-treated: vacuum degree≤6.5KPa, recycles pure degassing time not less than 12 minutes, vacuum time is not less than
20min.Calcium treatment is carried out after trimming, every furnace molten steel feeds 650~850g/t of Si-Ca line by weight, feeds rate control
It is since recovery rate of the silicon-calcium wire line feeding rate to silicon-calcium wire has a great impact, Calcium treatment can change in 260~320m/min
Kind steel, Calcium treatment make Al2O3It is changed into low melting point 12CaOAl2O3, accelerate to be mingled with floating, reduce Al2O3It is mingled with, and
Make Al2O3Become that spherical aluminium calciate is indeformable to be mingled with from string-like；Calcium treatment makes sulfide (FeS, MnS) be changed into spherical CaS,
To which steel plate impact flexibility greatly improves, anisotropy is greatly improved；Calcium treatment can also improve the mixed casting performance of molten steel,
Prevent middle packet stopper and submersed nozzle by Al2O3It is mingled with blocking.To reduce production cost, increase economic efficiency.
Sheet billet continuous casting: sheet billet continuous casting: use anti-crack plate blank protecting slag, continuous casting secondary cooling system use weak cold mode with
It is cracked when slab being prevented to be poured；Tundish temperature control at 1565 ± 30 DEG C, casting speed control in 1.45 ± 0.3m/min, wherein
Sheet billet continuous casting uses whole process protection casting process, and crystallizer uses electromagnetic agitation (M-EMS) technology, wheel currently in use
Steel material, all without having many restrictions on the service performance of material using M-EMS (M-EMS) technology, from
And lead to material it is impossible to meet harsh service condition requirements, limit is received so as to cause the further genralrlization use of material
System.The present invention is tested by numerous studies, shows that molten steel can be greatly reduced using M-EMS (M-EMS) technology
The degree of superheat, shorten setting time, to generate wide and thin isometric crystalline region, make solidification front forced convertion, before smashing solidification
The dendrite on edge, the fragment refuse of dendrite, reduces liquid steel temperature, increases equiax crystal core, has blocked column crystal
The development in forward position forms roomy isometric crystalline region.The agitation of molten steel reduces the temperature gradient of wick-containing ecto-entad, surrounding knot
Brilliant uniformly development, to improve the equiaxial crystal ratio on casting blank section, is uniformly distributed segregation element, solute element is avoided to gather,
The final segregation for improving slab improves the comprehensive service performance such as shock resistance of material.
Slab computer heating control: cold base shove charge, pre-add hot arc temperature is at 550~700 DEG C, 70~100min of preheating time, one
Bringing-up section temperature 30~50min between 1000~1100 DEG C, an added-time, two bringing-up section temperature are at 1120~1230 DEG C, two added-time
Between 40~55min, soaking section temperature is at 1170~1230 DEG C；Soaking time 30~45min, total heating time control 170~
250min, with the base temperature difference≤30 DEG C, board briquette is uniform, and element is sufficiently dissolved, and the thickness of the effectively raw iron scale of control furnace
With quantity, be conducive to obtain the product material of excellent surface quality.
Why the present invention after the first passage of finish rolling carries out high-pressure water descaling again: being the master due to being formed in continuous tunnel furnace
If by Fe3O4The once oxidation iron sheet of composition can be removed by the descaling mill of the vertical miller entrance side before roughing mill, therefore be set
Determine roughing de-scaling and be no less than five passages, in heat preservation rollgang and between the roller-way and the descaling mill of finishing mill, still can
A large amount of secondary oxidation iron sheet is generated, mainly by Fe2O3、Fe3O4Composition, can be removed, therefore set by the descaling mill before finishing mill
Descaling header unlatching number is no less than two before determining finish rolling, and generates three times in finishing mill De-scaling box between finish rolling finish to gauge rack
Iron scale is relatively difficult to, and FeO content is high in the iron scale especially generated between de-scaling point and F3 rack, therefore
De-scaling mode after F1 rack is devised, the effect of de-scaling is ensured by de-scaling after F1 rack, and reach by F1 rack de-scaling water
To the control into finish rolling plate face temperature, the generation of iron scale three times is reduced, so that better material surface quality is obtained, and by
The effect of de-scaling after F1 rack, reduces the attrition in the operation of rolling to roller surface, so as to the table to steel plate
Surface roughness carries out good control.
Why the present invention controls finish rolling finishing temperature control at 810~840 DEG C, is the shape due in hot procedure
Become final temperature to have a major impact the tissue of steel, deformation final temperature is higher, and the tendentiousness of crystal grain agglomeration is just stronger, institute
Obtained austenite grain is also just coarseer, therefore should reduce deformation final temperature when becoming a useful person as far as possible, but be generally not less than
Ar3 is refined crystal grain by controlled rolling and controlled cooling means and improves product quality, and by finishing temperature control 810~
840 DEG C, be to be adapted to rolling rhythm, fast speed rolling reduces the generation of iron scale three times, obtains the production of great surface quality
Product.
Section cooling, by the way of leading portion ultra-rapid cooling, cooling velocity is 160~200 DEG C/s.The increase of cooling rate,
Ar3 can be made to reduce, phase change core increases, and the crystal grain-growth after phase transformation is suppressed, and therefore, F crystal grain is fined, and rises to material
To the effect of refined crystalline strengthening.
Why the present invention controls coiling temperature at 520~550 DEG C, is by researching and analysing, scale structure is divided into
Three layers, ferrous oxide (FeO) is closest to that layer of iron, and when temperature is lower than 570 DEG C, ferrous oxide (FeO) is in unstable shape
State, the content with the increase ferrous oxide (FeO) of surface of steel plate temperature increase, and temperature is higher than 700 DEG C, ferrous oxide (FeO)
Content in iron scale reaches 95%；Ferroso-ferric oxide (Fe3O4) be iron scale middle layer, temperature be lower than 500 DEG C
When, iron scale is only by ferroso-ferric oxide (Fe3O4) single phase composition, temperature is higher than 700 DEG C, ferroso-ferric oxide (Fe3O4) in
Ferrous oxide (FeO) is initially formed, and at very high temperatures, ferroso-ferric oxide (Fe3O4) only account for the 4% of iron scale.Four oxygen
Change three-iron (Fe3O4) it is a kind of harder, more wear resistant phase；Iron oxide (Fe2O3) it is in the outermost layer of iron scale, usually exist
Exist under high temperature, generally only accounts for the 1% of iron scale thickness.So the present invention passes through many experiments and analysis and research, it is determined
Coiling temperature not only contributes to further be formed on the surface of the material in this way loose based on FeO structure at 550~590 DEG C
Iron scale, and iron scale thickness is reduced, be conducive to following process using the removal to material surface iron scale, thus
Plate surface quality is improved, improves the surface quality of product, and energy consumption can also be reduced.And prior art oiler temperature control is
630~650 DEG C, higher temperature causes iron scale thickness to increase considerably, and material following process is made to become more difficult,
And increase human cost, process cost and facility load, the surface quality of material with iron scale thickness increase and
It is difficult to remove and be deteriorated, surface quality risk increases, and the difficulty of excessively high coiling temperature and subsequent handling increases, and results in
The increase of energy consumption.
Smooth: whole power is set as 2.0%~2.5%, can expand the plastic deformation regime of material, eliminates the surrender of material
Platform prevents from generating skid wire when cold forming.Simultaneously, it is ensured that material adjusts material along the uniformity of rolling direction elongation
Plate shape and surface quality, be conducive to improve material forming property.
Metallographic structure of the invention be ferrite+pearlite, 10.5 grades of ferrite grain size.
Compared with prior art, the present invention not only guarantee thickness specification in 9~11mm, material lower yield strength >=
275MPa, 370~470MPa of tensile strength, elongation percentage A50>=40%, ballistic work A under the conditions of -20 DEG Ckv>=175J, material is through dodging
Light is to postwelding, 180 ° of lateral sample, and Bend diameter d=0a is qualified, keep fatigue strength >=140MPa inner tube-free wheel rim cold at
Type precision is high, and qualification rate improves at least 5%.
Detailed description of the invention
Attached drawing 1 is metallographic structure figure of the invention.
Specific embodiment
The present invention is described in detail below:
Table 1 is the comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example performance text list；
Table 4 is ingredient and the weight percent content situation list of various embodiments of the present invention and comparative example clinker.
Various embodiments of the present invention produce according to the following steps:
1) enter LF furnace after converter smelting and carry out external refining；
2) RH application of vacuum is carried out；At the end of control is vacuum-treated, P≤0.008% in molten steel, S≤0.005%, very
The time is managed not less than 20min in vacancy；；Calcium treatment is carried out after trimming, and feeds Si-Ca according to 650~850g/ tons of steel
Line feeds rate control in 260~320m/min；
3) it is casting continuously to form base to heat slab, heating and temperature control is at 1170~1230 DEG C；
4) roughing is carried out, and control it to terminate temperature at 1040~1080 DEG C；
5) finish rolling is carried out, and controls finishing temperature at 810~840 DEG C；
6) ultra-rapid cooling is carried out, is cooled to coiling temperature in the case where cooling velocity is 160~200 DEG C/s；
7) batched: control coiling temperature is at 510~540 DEG C；
8) smooth: smooth power is set as 2.0%~2.5%.
The chemical component list (wt%) of 1 various embodiments of the present invention of table and comparative example
The main technologic parameters list of 2 various embodiments of the present invention of table and comparative example
Mechanics properties testing the results list of 3 various embodiments of the present invention of table and comparative example
The ingredient and content situation list (wt%) of 4 various embodiments of the present invention of table and comparative example clinker
From table 3 it can be seen that material has good mechanical property, good low temperature impact properties and fatigue behaviour, it is complete
It can satisfy the performance requirement of wheel steel entirely, especially face actual condition complicated and changeable, the requirement to material is also big
The raising of amplitude, and steel grade material of the invention is also that can fully meet needs, in client's use site, tracks statistical
Analysis discovery, using the material production production rim for automobile wheel that this law is bright, the precision of part is high after cold forming, according to statistics, qualification rate
Material relative to early period at least improves 5%.Various embodiments of the present invention are qualification.
Above-described embodiment is only the best example, rather than a limitation of the embodiments of the present invention.
Claims (3)
1. a kind of thickness is in 9 ~ 11mm thickness tubeless rim steel, component and weight percent content are as follows: C:0.040~
0.063%, Si:0.045~0.100%, Mn:0.35~0.70%, P :≤0.006%, S :≤0.005%, O :≤0.0020%, N :≤
0.0030%, Als:0.035~0.065%, surplus are Fe and inevitable impurity.
2. producing a kind of method of the thickness as described in claim 1 in 9 ~ 11mm thickness tubeless rim steel, step:
1) enter LF furnace after converter smelting and carry out external refining；And external refining overall process is carried out in LF furnace and uses Argon
Stirring；
2) RH application of vacuum is carried out；At the end of control is vacuum-treated, P≤0.008% in molten steel, S≤0.005% is vacuum-treated
Time is not less than 20min;；Calcium treatment is carried out after trimming, and feeds Si-Ca line, feeding according to 650~850g/ tons of steel
Rate control is in 260~320m/min；
3) it is casting continuously to form base to heat slab, heating and temperature control is at 1170 ~ 1230 DEG C；
4) roughing is carried out, and control it to terminate temperature at 1040 ~ 1080 DEG C；
5) finish rolling is carried out, and controls finishing temperature at 810 ~ 840 DEG C；
6) ultra-rapid cooling is carried out, is cooled to coiling temperature in the case where cooling velocity is 160~200 DEG C/s；
7) batched: control coiling temperature is at 510~540 DEG C；
8) smooth: smooth power is set as 2.0%~2.5%.
3. a kind of thickness as claimed in claim 2 is in the method for 9 ~ 11mm thickness tubeless rim steel, it is characterised in that: outside LF furnace
The ingredient and weight percent content of clinker in refining process are as follows: CaO:50%~55%, Al2O3: 25%~28%, MgO:6%
~8%, SiO2: 9%~12%, TFe < 0.6%, and basicity R:4.0~4.5 of control clinker.
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| CN201910042594.5A CN109797336B (en) | 2019-01-17 | 2019-01-17 | Tubeless rim steel with thickness of 9-11 mm and production method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112226691A (en) * | 2020-09-30 | 2021-01-15 | 鞍钢股份有限公司 | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof |
| CN112226690A (en) * | 2020-09-30 | 2021-01-15 | 鞍钢股份有限公司 | Pickled steel plate for 1800 MPa-level hot stamping wheel rim and manufacturing method thereof |
| CN112251669A (en) * | 2020-09-30 | 2021-01-22 | 鞍钢股份有限公司 | Hot rolled steel plate for 2000 MPa-level hot stamping wheel spoke and manufacturing method thereof |
| CN112267067A (en) * | 2020-09-30 | 2021-01-26 | 鞍钢股份有限公司 | Hot rolled steel plate for 2000 MPa-level hot stamping wheel rim and manufacturing method thereof |
| CN112267066A (en) * | 2020-09-30 | 2021-01-26 | 鞍钢股份有限公司 | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel rim and manufacturing method thereof |
| CN112267065A (en) * | 2020-09-30 | 2021-01-26 | 鞍钢股份有限公司 | Pickled steel plate for 2000 MPa-level hot stamping wheel rim and manufacturing method thereof |
| CN114559222A (en) * | 2022-03-21 | 2022-05-31 | 张家港今日精锻有限公司 | Method for manufacturing tubeless multi-piece wheel rim for off-highway automobile |
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