CN107937815A - A kind of width cold-bending property good think gauge spoke steel and production method - Google Patents
A kind of width cold-bending property good think gauge spoke steel and production method Download PDFInfo
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- CN107937815A CN107937815A CN201711143637.6A CN201711143637A CN107937815A CN 107937815 A CN107937815 A CN 107937815A CN 201711143637 A CN201711143637 A CN 201711143637A CN 107937815 A CN107937815 A CN 107937815A
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- cold
- steel
- bending property
- think gauge
- spoke steel
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Classifications
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D2211/002—Bainite
-
- 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
Abstract
A kind of good think gauge spoke steel of width cold-bending property, its chemical composition and weight percent content are：C：0.08 ~ 0.10%, Si≤0.02%, Mn：0.70 ~ 0.90%, P≤0.008%, S≤0.002%, Als：0.020 ~ 0.060%, Nb：0.046~0.055%.Production method：Enter RH stoves after converter smelting and carry out application of vacuum；It is casting continuously to form after base to heating strand；Carry out hot rolling；Carry out sub-sectional cooling；Batch；Carry out finishing and rear process.Grain size of the present invention is 13.5 grades, and metallographic structure is ferrite+pearlite+bainite, lower yield strength >=420MPa, 540 ~ 650MPa of tensile strength, elongation percentage to A >=30%；Impact energy Ak v >=180J under the conditions of 40 DEG C, during horizontal 180 ° of cold bending experiments of sample, specimen width 50mm, Bend diameter d=0a are qualified, fully meet the processing request of more high-end user.
Description
Technical field
The present invention relates to a kind of automobile steel and production method, particularly belongs to a kind of good think gauge wheel of wide cold-bending property
Spoke steel and production method.
Background technology
With the sustainable development of domestic steel industry, it is continuously increased for the demand of iron ore, also so that the exploitation in mine
Amount increasingly increases.Mine vehicle is in the mine operation of severe cold area, due to severe low temperature environment, it usually needs in autumn and winter
Steel wheel is changed to aluminum road wheel by section, and steel wheel is gained again in spring and summer season, this not only adds production cost, also to production
Rhythm etc. causes serious influence.Therefore be badly in need of developing it is a kind of can be used in severe cold area have the good low-temperature impact tough
Property think gauge mine wheel-use steel material, and crucial technical problem is how fine grain to be obtained under the rolling condition of think gauge
Steel tissue.It is easily cracking, it is necessary to improve steel in bending and forming at the same time with the increase of steel strength and thickness
Wide cold-bending property.
Through preliminary search, number of patent application is：The document of CN 201610392108.9, it discloses a kind of think gauge load
Weight automobile spoke steel and preparation method thereof.The invention spoke steel, is made of following weight percent composition：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；Its preparation method includes：Slab heating temperature is 1200
~1240 DEG C；Roughing uses 5 passes, every time deflection >=20%；985~1050 DEG C of entry temperature at finishing, finish to gauge temperature
Spend for 830~870 DEG C；Using sub-sectional cooling mode, coiling temperature is 530~580 DEG C.Impacted in the embodiment of the patent disclosure
Performance test temperature is 20 DEG C, can not meet that low temperature environment uses.
Chinese Patent Application No. is the document of CN201410786247.0, discloses think gauge hot rolling 600MPa grades a kind of
Spoke steel and its manufacture method, using C-Si-Mn-Cr systems and roll rear conventional chilling to less than 350 DEG C, due to conventional chilling
Cooling rate is relatively low, and to rolling rear crystal grain, to reply the inhibitory action grown up relatively low, is unfavorable for obtaining fine grain structure, can not meet good low
The requirement of warm impact flexibility.
Chinese Patent Application No. is the document of CN200810016183.0, using C-Si-Mn systems and the back segment type of cooling,
Its back segment type of cooling so that the steel after rolling need to first pass through extremely low air-cooled, the steel in this period of one section of cooling rate
Crystal grain is grown up reply occurs, and makes final finished be difficult to obtain fine grain structure, can not meet wanting for favorable low-temperature impact toughness
Ask.
Chinese Patent Application No. is the document of CN200810176548.6, and using C-Si-Mn-Ti systems, roller repairing is put down
10.5~25.0 DEG C/s of equal speed, cooling velocity is relatively low to be difficult to obtain fine grain structure, can not meet favorable low-temperature impact toughness
Requirement.
Chinese Patent Application No. is the document of CN201310407739.X, using C-Si-Mn systems, using cooling rate 25~30
DEG C/the common section cooling of s, cooling velocity is relatively low to be difficult to obtain fine grain structure, can not meet favorable low-temperature impact toughness
It is required that.
The content of the invention
The invention reside in overcome the shortcomings of the prior art, there is provided a kind of mechanical property：Grain size is 13.5 grades, metallographic
It is organized as ferrite+pearlite+bainite, lower yield strength >=420MPa, 540~650MPa of tensile strength, elongation percentage to A >=
30%；Ballistic work A under the conditions of -40 DEG Ckv>=180J, during horizontal 180 ° of cold bending experiments of sample, specimen width 50mm, Bend diameter d
The wide cold-bending properties of=0a qualifications good think gauge spoke steel and production method.
Realize the measure of above-mentioned purpose：
A kind of good think gauge spoke steel of width cold-bending property, its chemical composition and weight percent content are：C：
0.08~0.10%, Si≤0.02%, Mn：0.70~0.90%, P≤0.008%, S≤0.002%, Als：0.020~
0.060%, Nb：0.046~0.055%, surplus is Fe and inevitable impurity；Mechanical property：Grain size is 13.5 grades, gold
Phase constitution is ferrite+pearlite+bainite, lower yield strength >=420MPa, 540~650MPa of tensile strength, elongation percentage to A
>=30%；Ballistic work A under the conditions of -40 DEG Ckv>=180J, during horizontal 180 ° of cold bending experiments of sample, specimen width 50mm, Bend diameter
D=0a is qualified.
Preferably：Weight percent content≤0.012% of Si.
Preferably：The weight percent content of Mn is 0.75~0.85%.
Preferably：The weight percent content of Nb is 0.048~0.052%.
Preferably：The weight percent content of Als is 0.022~0.055%.
The method for producing a kind of good think gauge spoke steel of wide cold-bending property, its step：
1) enter RH stoves after converter smelting and carry out application of vacuum, processing time is not less than 15min；
2) strand is heated after being casting continuously to form base：At 1250~1290 DEG C, heating time is not less than heating and temperature control
160min；
3) hot rolling is carried out, and controls roughing end temp finish rolling finishing temperature is at 820~860 DEG C at 1040~1080 DEG C；
4) sub-sectional cooling is carried out to the coil of strip after rolling, first segment is cooled to 720 in the case where cooling velocity is 90~130 DEG C/s
~770 DEG C,
Cooling velocity is to be cooled to coiling temperature under 10~25 DEG C/s to second segment again；
5) batched, control coiling temperature is at 540~580 DEG C；
6) finishing and rear process are carried out.
Preferably：First segment cooling velocity is 98~125 DEG C/s in step 4), and cooling velocity is 15~22 to second segment again
℃/s。
The effect of each element and master operation and mechanism in the present invention：
Carbon：Carbon is cheap solution strengthening element.According to the application range of this steel grade, it is mainly used for processing automotive wheel etc.
Part is, it is necessary to carry out largely Pressing Deformation processing, therefore it is required that material while intensity requirement is met, has well
Cold formability energy.If its content is less than 0.08%, it cannot meet the requirement of the strength of materials；If its content is more than
0.10%, then it cannot meet the favorable forming property of material.So its content is limited to 0.08~0.10% scope.
Manganese：Manganese is to improve intensity and the most effective element of toughness.If its content is less than 0.70%, it cannot meet material
Intensity requirement；But the manganese of addition volume, the quenching degree for increasing steel can be caused, make crackle quick due to welding the appearance of hardened layer
Perception increases, and increases the cost of alloy of steel.In consideration of it, 0.90% will be defined to thereon, so, its content is limited to
0.70~0.90% scope.Preferably：The weight percent content of Mn is 0.75~0.85%.
Phosphorus：In order to avoid the welding performance of material, stamping formabilily, toughness, suitability for secondary processing deteriorate, setting
Its upper content limit is 0.008%.So by the control of its content below 0.008%.
Sulphur：Sulphur is very harmful element.Sulphur in steel often exists with the oxide morphology of manganese, this sulphide inculsion pair
The forming property of steel is very unfavorable, and causes the anisotropy of performance, therefore, need to control sulfur content in steel more low better.
Therefore, by sulfur content control in steel below 0.002%.
Niobium：Niobium mainly improves the intensity of steel by crystal grain thinning and precipitation strength, in steel mainly in the form of Nb (C, N)
In the presence of making ferrite grain size diminish, thinning microstructure.When its content is less than 0.045%, it is impossible to meet material high intensity
It is required that；And add niobium be higher than 0.055% when, can meet the requirement of its intensity and processability, if adding again, cost of alloy
Can significantly it rise.So being required according to the performance objective of steel grade, its content is limited to 0.045~0.055% scope.It is preferred that
The weight percent content of ground Nb is 0.048~0.052%.
Silicon：Silicon belongs to harmful element in the present invention.Si elements can produce Fe through peroxidating in high temperature environments2SiO4, increase
Add the adhesive force of iron scale and steel substrate surface, reduced the effect of de-scaling process, deteriorate the surface quality of steel plate.Therefore it is right
Stringent control has been carried out in silicone content, its content is limited to less than 0.02%.Preferably the weight percent content of Si≤
0.012%.
Aluminium：Aluminium adds for deoxidation, when Als contents are less than 0.020%, it is impossible to play its effect；The opposing party
Face, since the aluminium for adding volume easily forms aluminium oxide agglomerate, so, it is specified that the Als upper limits are 0.060%.Preferably：Als's
Weight percent content is 0.022~0.055%.
Why the present invention carries out segmentation rolling, and controls roughing end temp at 1040~1080 DEG C, and control finish rolling is whole
Temperature is rolled at 820~860 DEG C.This is because if roughing end temp is less than 1040 DEG C, it can not ensure finish rolling finishing temperature
Reach setting value, increase rolling load, increase energy consumption；Such as it is higher than 1080 DEG C, then can produces more iron scale, influence steel
Surface quality.If finish rolling finishing temperature is less than 820 DEG C, it can be rolled in the two-phase region of material, cause mixed crystal etc.
Defect；Such as it is higher than 860 DEG C, then the original austenite grains of steel can be excessively thick, reduces the intensity of steel.
Why the present invention after rolling be cooled to 720 in the case where first segment is 90~130 DEG C/s in cooling velocity immediately~
770 DEG C, be to be cooled down in time when the recrystal grain for ensureing in steel does not have started and grows up, avoid the production of thick tissue
It is raw, material is obtained tiny original austenite grains tissue；Cooling velocity is to be cooled to volume under 10~25 DEG C/s to second segment again
Temperature is taken, second segment cooling procedure is cooled down according to cooling velocity for 10~25 DEG C/sec, is so conducive to when uniform gold
Phase constitution, enables the precipitate even dispersion such as carbide to be distributed in base steel, ensures that material possesses good forming property.It is cold
But to 540~580 DEG C, the purpose is to suppress to grow up after crystal grain rolls in steel by high cooling velocity, it is made to be kept before batching
The crystalline form of fine uniform, so as to preferably play the reinforcing effect of the precipitates such as Nb (C, N), has final steel thin
Small crystallite dimension, grain size reach 13 grades.Preferably first segment is 98~125 DEG C/s in cooling velocity, and second segment cools down again
Speed is 15~22 DEG C/s：
Compared with prior art, the present invention mechanical property：Grain size be 13.5 grades, metallographic structure for ferrite+pearlite+
Bainite, lower yield strength >=420MPa, 540~650MPa of tensile strength, elongation percentage to A >=30%；Impacted under the conditions of -40 DEG C
Work(Akv>=180J, during horizontal 180 ° of cold bending experiments of sample, specimen width 50mm, Bend diameter d=0a are qualified, fully meet higher
The processing request of end subscriber.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of the present invention；
Embodiment
The present invention is described in detail below：
Table 1 is the chemical composition list of each case study on implementation of the present invention；
Table 2 is the main technologic parameters list of each case study on implementation of the present invention；
Table 3 is the performance detection list of each case study on implementation of the present invention.
Each case study on implementation of the present invention follows the steps below production：
1) enter RH stoves after converter smelting and carry out application of vacuum, processing time is not less than 15min；
2) strand is heated after being casting continuously to form base：At 1250~1290 DEG C, heating time is not less than heating and temperature control
160min；
3) hot rolling is carried out, and controls roughing end temp finish rolling finishing temperature is at 820~860 DEG C at 1040~1080 DEG C；
4) sub-sectional cooling is carried out to the coil of strip after rolling, first segment is cooled to 720 in the case where cooling velocity is 90~130 DEG C/s
~770 DEG C, cooling velocity is to be cooled to coiling temperature under 10~25 DEG C/s to second segment again；
5) batched, control coiling temperature is at 540~580 DEG C；
6) finishing and rear process are carried out.
The chemical composition list 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
From table 3 it can be seen that component designed by the invention and technique manufacture steel plate, relative to contrast steel plate, its
With thinner grain structure, so that steel obtain excellent low temperature impact properties, impact function ensures under the conditions of -40 DEG C
In more than 180J, while thin grain structure also causes steel to have good wide cold-bending property, can reach d=0 qualifications.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (7)
1. a kind of good think gauge spoke steel of width cold-bending property, its chemical composition and weight percent content are：C：0.08~
0.10%, Si≤0.02%, Mn：0.70 ~ 0.90%, P≤0.008%, S≤0.002%, Als：0.020 ~ 0.060%, Nb：0.046~
0.055%, surplus is Fe and inevitable impurity；Mechanical property：Grain size is 13.5 grades, and metallographic structure is ferrite+pearly-lustre
Body+bainite, lower yield strength >=420MPa, 540 ~ 650MPa of tensile strength, elongation percentage to A >=30%；- 40 DEG C of condition undershoots
Hit work(Akv>=180J, during horizontal 180 ° of cold bending experiments of sample, specimen width 50mm, Bend diameter d=0a are qualified.
A kind of 2. good think gauge spoke steel of wide cold-bending property as claimed in claim 1, it is characterised in that：The weight of Si
Degree≤0.012%.
A kind of 3. good think gauge spoke steel of wide cold-bending property as claimed in claim 1, it is characterised in that：The weight of Mn
Degree is 0.75 ~ 0.85%.
A kind of 4. good think gauge spoke steel of wide cold-bending property as claimed in claim 1, it is characterised in that：The weight of Nb
Degree is 0.048 ~ 0.052%.
A kind of 5. good think gauge spoke steel of wide cold-bending property as claimed in claim 1, it is characterised in that：The weight of Als
It is 0.022 ~ 0.055% to measure degree.
6. a kind of method of the good think gauge spoke steel of production wide cold-bending property as claimed in claim 1, its step：
1）Enter RH stoves after converter smelting and carry out application of vacuum, processing time is not less than 15min；
2）Strand is heated after being casting continuously to form base：At 1250 ~ 1290 DEG C, heating time is not less than heating and temperature control
160min；
3）Hot rolling is carried out, and controls roughing end temp finish rolling finishing temperature is at 820 ~ 860 DEG C at 1040 ~ 1080 DEG C；
4）Carrying out sub-sectional cooling to the coil of strip after rolling, first segment is cooled to 720 in the case where cooling velocity is 90~130 DEG C/s~
770 DEG C, cooling velocity is to be cooled to coiling temperature under 10~25 DEG C/s to second segment again；
5）Batched, control coiling temperature is at 540~580 DEG C；
6）Carry out finishing and rear process.
7. producing a kind of method of the good think gauge spoke steel of wide cold-bending property as claimed in claim 6, its feature exists
In：Step 4）Middle first segment cooling velocity is 98~125 DEG C/s, and cooling velocity is 15~22 DEG C/s to second segment again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711143637.6A CN107937815A (en) | 2017-11-17 | 2017-11-17 | A kind of width cold-bending property good think gauge spoke steel and production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711143637.6A CN107937815A (en) | 2017-11-17 | 2017-11-17 | A kind of width cold-bending property good think gauge spoke steel and production method |
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| CN107937815A true CN107937815A (en) | 2018-04-20 |
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ID=61932686
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| CN201711143637.6A Pending CN107937815A (en) | 2017-11-17 | 2017-11-17 | A kind of width cold-bending property good think gauge spoke steel and production method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136759A (en) * | 2018-09-10 | 2019-01-04 | 武汉钢铁有限公司 | Spoke 1300MPa grades of hot forming steel of think gauge and preparation method |
| CN112522616A (en) * | 2020-11-23 | 2021-03-19 | 首钢集团有限公司 | 650 MPa-grade hot-rolled high-strength steel and preparation method and application thereof |
| CN113073251A (en) * | 2021-03-25 | 2021-07-06 | 山东钢铁集团日照有限公司 | Manufacturing method of 590 MPa-grade hot-rolled complex phase steel for thick-specification high-fatigue-performance automobile spoke |
| CN113073260A (en) * | 2021-03-16 | 2021-07-06 | 武汉钢铁有限公司 | Steel for high-plasticity cold-roll forming with tensile strength of 500MPa and production method thereof |
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|---|---|---|---|---|
| US4388122A (en) * | 1980-08-11 | 1983-06-14 | Kabushiki Kaisha Kobe Seiko Sho | Method of making high strength hot rolled steel sheet having excellent flash butt weldability, fatigue characteristic and formability |
| CN101812637A (en) * | 2009-02-19 | 2010-08-25 | 上海梅山钢铁股份有限公司 | High-strength high-tenacity steel used for automobile wheels and production method thereof |
| WO2013117953A1 (en) * | 2012-02-10 | 2013-08-15 | Ascometal | Process for making a steel part, and steel part so obtained |
| CN104388820A (en) * | 2014-11-17 | 2015-03-04 | 武汉钢铁(集团)公司 | High-strength hot-rolled strip steel having favorable stretch-flangeability and production method thereof |
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2017
- 2017-11-17 CN CN201711143637.6A patent/CN107937815A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4388122A (en) * | 1980-08-11 | 1983-06-14 | Kabushiki Kaisha Kobe Seiko Sho | Method of making high strength hot rolled steel sheet having excellent flash butt weldability, fatigue characteristic and formability |
| CN101812637A (en) * | 2009-02-19 | 2010-08-25 | 上海梅山钢铁股份有限公司 | High-strength high-tenacity steel used for automobile wheels and production method thereof |
| WO2013117953A1 (en) * | 2012-02-10 | 2013-08-15 | Ascometal | Process for making a steel part, and steel part so obtained |
| CN104388820A (en) * | 2014-11-17 | 2015-03-04 | 武汉钢铁(集团)公司 | High-strength hot-rolled strip steel having favorable stretch-flangeability and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136759A (en) * | 2018-09-10 | 2019-01-04 | 武汉钢铁有限公司 | Spoke 1300MPa grades of hot forming steel of think gauge and preparation method |
| CN112522616A (en) * | 2020-11-23 | 2021-03-19 | 首钢集团有限公司 | 650 MPa-grade hot-rolled high-strength steel and preparation method and application thereof |
| CN113073260A (en) * | 2021-03-16 | 2021-07-06 | 武汉钢铁有限公司 | Steel for high-plasticity cold-roll forming with tensile strength of 500MPa and production method thereof |
| CN113073251A (en) * | 2021-03-25 | 2021-07-06 | 山东钢铁集团日照有限公司 | Manufacturing method of 590 MPa-grade hot-rolled complex phase steel for thick-specification high-fatigue-performance automobile spoke |
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Application publication date: 20180420 |