CN106521327A - Hot-rolled pickled steel strip with high broaching performance and production method thereof - Google Patents
Hot-rolled pickled steel strip with high broaching performance and production method thereof Download PDFInfo
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- CN106521327A CN106521327A CN201611232202.4A CN201611232202A CN106521327A CN 106521327 A CN106521327 A CN 106521327A CN 201611232202 A CN201611232202 A CN 201611232202A CN 106521327 A CN106521327 A CN 106521327A
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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
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
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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
- 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
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a hot-rolled pickled steel strip with high broaching performance and a production method thereof, and belongs to the technical field of steelmaking. The hot-rolled pickled steel strip comprises the following chemical components by mass percent: 0.03% to 0.1% of C, 0.1% or fewer of Si, 0.5% to 1.5% of Mn, 0.02% or fewer of P, 0.006% of fewer of S, 0.05% or fewer of Nb, 0.1% or fewer of Ti, 0.15% or fewer of Mo and 0.1% to 0.4% of Re, and the balance being Fe and unavoidable impurities. An internal microscopic structure of the hot-rolled pickled steel strip is ferrite. The production method comprises the steps of molten iron pretreatment, smelting, casting, hot rolling, cooling, reeling, levelling and pickling, a three-stage cooling mode of water cooling, air cooling and water cooling is adopted, and constant-speed rolling is controlled. According to the obtained hot-rolled pickled steel strip, the tensile strength is larger than or equal to 980 MPa, the broaching rate lambda is larger than or equal to 110%, the elongation is larger than or equal to 20%, and the surface quality of the steel strip is excellent.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of hot rolling acid-cleaning strip steel with high reaming performance and its life
Product method.
Background technology
The high reaming steel of hot rolling acid-cleaning as a steel grade in advanced high-strength steel (AHSS), with traditional low-alloy high-strength
Degree, ferrito-martensite dual phase steel are compared, and with its high intensity, high reaming performance, are widely used for manufacturing automobile spoke, bottom
The structural members such as the various frameworks of disk, car body.
As the parts such as the development of automotive light weight technology, automobile spoke, control arm, car body have pole to product strength, hole expansibility
High requirement, the demand of 980MPa grade products can be stepped up.Traditional ferrite+martensite (F+M), although with compared with
High extensibility, but reaming performance is very low；The single-phase steel of homogeneous structure such as bainite, although hole expansibility is very high, but extensibility
Can be relatively low.
The content of the invention
It is an object of the invention to provide a kind of hot rolling acid-cleaning strip steel with high reaming performance and its production method, Neng Goubao
Card tensile strength 980MPa level hot rolling acid-cleaning steel has high hole expansibility and elongation percentage simultaneously.
On the one hand, for achieving the above object, the invention provides a kind of hot rolling acid-cleaning strip steel with high reaming performance, its
Chemical composition mass percent is：C：0.03%～0.1%, Si：≤ 0.1%, Mn：0.5%～1.5%, P≤0.02%, S≤
0.006%th, Nb≤0.05%, Ti≤0.1%, Mo≤0.15%, Re：0.1%～0.4%, remaining is for Fe and inevitably
Impurity；
The internal microstructure of the hot rolling acid-cleaning strip steel is ferrite.
Further, the tensile strength >=980MPa of the hot rolling acid-cleaning strip steel.
Further, hole expansibility λ >=110% of the hot rolling acid-cleaning strip steel, elongation percentage >=20%.
On the other hand, present invention also offers a kind of production method of the hot rolling acid-cleaning strip steel with high reaming performance, bag
Include：
After by molten iron pretreatment, slab is obtained through smelting and casting；
The slab is heated, then Jing rollings obtain hot rolled plate；Wherein, the rolling adopts constant speed rolling, and rolls
Speed controlling processed is in 5～10m/s；The rolling includes roughing and finish rolling, controls roughing final temperature for 1030～1130 DEG C, control
Finish rolling final temperature processed is 850～900 DEG C；
The hot rolled plate is cooled down stage by stage, hot rolled coil after cooling, is coiled into；Wherein, it is described to be cooled to water stage by stage
The three-stage cooling pattern of cold+air cooling+water-cooled；
After the hot rolled coil flattened, pickling, acquisition internal microstructure is ferritic strip steel.
Further, the hot rolled plate thickness specification excursion is controlled in 1.8～5mm.
Further, the three-stage cooling pattern of the water-cooled+air cooling+water-cooled is specially：By hot rolled plate elder generation water-cooled extremely
, the air cooling of 5～10s is then carried out, water-cooled is finally carried out again to 580～620 DEG C by 650～700 DEG C.
Further, the hot rolled coil it is smooth it is front be first cooled to room temperature, control smooth elongation percentage 1%～3%.
Further, the speed of service for controlling the pickling is 60m/min～100m/min.
Further, control last descaling bath pickling temperature and be controlled to 30 for 80～90 DEG C, iron concentration～
40g/L。
Further, the tensile strength >=980MPa of the hot rolling acid-cleaning strip steel, hole expansibility λ >=110%, elongation percentage >=
20%.
One or more technical schemes provided in the embodiment of the present invention, at least have the following technical effect that or advantage：
1st, the hot rolling acid-cleaning strip steel with high reaming performance for providing in the embodiment of the present invention, using C-Mn-Nb-Ti-Mo
Component system, by adding rare earth element Re to optimize steel inclusion shape and size, eliminates to be originally present and rolls along steel
The ribbon MnS of directional spreding processed, improves the hole expansibility of steel；It is single-phase ferrite by optimizing tissue pattern, improves steel
Elongation percentage and hole expansibility；Tensile strength >=980MPa is ensured by the precipitation of second phase particles (Ti, Mo) C；So as to ensure to resist
Tensile strength 980MPa level hot rolling acid-cleaning steel has high hole expansibility and elongation percentage simultaneously.
The production method of the hot rolling acid-cleaning strip steel with high reaming performance for the 2nd, providing in the embodiment of the present invention, by optimization
The chemical composition of strip steel, is separated out using the three-stage cooling Schema control ferrite of water-cooled+air cooling+water-cooled, is made by constant speed rolling
Tissue ratio is stable, and coordinates smooth, acid cleaning process, obtains the hot rolling acid-cleaning that tensile strength 980MPa level has high reaming performance
Strip steel；Tensile strength >=the 980MPa of the hot rolling acid-cleaning strip steel of acquisition, hole expansibility λ >=110%, elongation percentage >=20% possess excellent
Different strip surface quality.
Description of the drawings
Fig. 1 is the organization chartss of the hot rolling acid-cleaning strip steel that the embodiment of the present invention 1 is obtained.
Specific embodiment
The embodiment of the present invention, can by providing a kind of hot rolling acid-cleaning strip steel with high reaming performance and its production method
Ensure that tensile strength 980MPa level hot rolling acid-cleaning steel has high hole expansibility and elongation percentage simultaneously；The hot rolling acid-cleaning strip steel of acquisition it is anti-
Tensile strength >=980MPa, hole expansibility λ >=110%, elongation percentage >=20% possess excellent strip surface quality.
For achieving the above object, the invention provides a kind of hot rolling acid-cleaning strip steel with high reaming performance, its chemistry into
Point mass percent is：C：0.03%～0.1%, Si：≤ 0.1%, Mn：0.5%～1.5%, P≤0.02%, S≤
0.006%th, Nb≤0.05%, Ti≤0.1%, Mo≤0.15%, Re：0.1%～0.4%, remaining is for Fe and inevitably
Impurity；
The internal microstructure of the hot rolling acid-cleaning strip steel is ferrite.
The strip steel organization type that the embodiment of the present invention is obtained is single-phase ferrite, and single-phase ferrite possesses excellent elongation percentage
And hole expansibility, strengthened by second phase particles (Ti, Mo) C is introduced in ferrite matrix, with ferrite+bainite dual-phase steel
Compare, the serial high reaming product made from steel has cooperation, good reaming performance and the fatigue behaviour of good cold formability.
The present invention further forms the hot rolling acid-cleaning strip steel of above chemical composition by optimized alloy element, is based on following original
Reason：
The embodiment of the present invention controls C element content range for 0.03%-0.1%, basic elements of the C as C-Mn systems,
It is the important element for realizing microstructure and mechanical property, its content is difficult to generate second phase particles (Ti, Mo) C less than 0.03%, enters
And make intensity decreases；Content is higher than 0.10%, is also easy to produce thick carbide, and then reduces the elongation percentage and hole expansibility of steel.
The embodiment of the present invention controls Si constituent content≤0.1%, and Si contents are higher to make the red squama of surface of steel plate be difficult to remove,
Affect surface quality.
The embodiment of the present invention controls Mn element content ranges and ensures steel as solution strengthening element for 0.5%～1.5%, Mn
Intensity.Mn too high levels easily cause strand component segregation, it is too low then cannot proof strength.
The embodiment of the present invention controls P element content≤0.02%, and P content produces p more than 0.02% easily in cyrystal boundary segregation
Crisp phenomenon.
The embodiment of the present invention controls S constituent content≤0.006%, and S easily forms MnS with Mn and is mingled with, and affects the reaming of steel
Rate.When S contents are more than 0.006%, the amount of inclusions is excessive, therefore controls its content≤0.006%.
The embodiment of the present invention controls Nb constituent content≤0.05%, and Nb primarily serves the effect of crystal grain thinning, but fine grain is strong
Change and improve yield strength substantially, it is exceeded to easily cause yield tensile ratio, therefore controls its content≤0.05%.
Embodiment of the present invention control Ti constituent content≤0.1%, Mo constituent content≤0.15%, Ti/Mo elements are combined with C
Carbide is formed, product strength is improved.
It is 0.1%～0.4% that the embodiment of the present invention controls Re element content ranges, is optimized by adding rare earth element Re
Steel inclusion shape and size.When addition Re contents are 0.1%～0.4%, spherical rare-earth sulfide still keeps tiny
Spherical or spindle, is relatively evenly distributed in steel, eliminates the ribbon being originally present along steel rolling directional spreding
MnS, so as to improve the hole expansibility of steel.
By the above as can be seen that the present invention optimizes steel inclusion shape and chi by adding rare earth element Re
It is very little, the ribbon MnS being originally present along steel rolling directional spreding is eliminated, the hole expansibility of steel is improve；And optimizing tissue shape
Looks are single-phase ferrite, improve the elongation percentage and hole expansibility of steel；Tension is ensured by the precipitation of second phase particles (Ti, Mo) C
Intensity >=980MPa.The present invention is optimized to chemical composition, is designed using mentioned component, it is possible to obtain with high hole expandability
The hot rolling acid-cleaning strip steel of energy, the tensile strength >=980MPa of strip steel, hole expansibility λ >=110%, elongation percentage >=20%.
For above-mentioned Multiphase Steel, the invention allows for a kind of production method.
A kind of production method of the hot rolling acid-cleaning strip steel with high reaming performance, comprises the following steps：Molten iron pretreatment →
Smelting → casting → hot rolling → cool down → batch → smooth → pickling；
After by molten iron pretreatment, slab is obtained through converter smelting, LF refining and continuous casting；Its chemical composition mass percent
For：C：0.03%～0.1%, Si：≤ 0.1%, Mn：0.5%～1.5%, P≤0.02%, S≤0.006%, Nb≤
0.05%th, Ti≤0.1%, Mo≤0.15%, Re：0.1%～0.4%, remaining is Fe and inevitable impurity.
Slab is heated, then Jing rollings obtain hot rolled plate；In the present embodiment, rolling adopts constant speed rolling, hot rolled plate
Thickness specification excursion is controlled in 1.8～5mm, and mill speed is according to thickness change and controls in 5～10m/s.Using constant speed
Rolling, the organizational controls and tissue ratio that can make entire volume are stablized in target zone, and stability is ensured very well.
Wherein, rolling includes roughing and finish rolling, controls roughing final temperature for 1030～1130 DEG C, and control finish rolling terminates temperature
Spend for 850～900 DEG C.
After hot rolling, the hot rolled plate is cooled down stage by stage, after cooling, is coiled into hot rolled coil.In the present embodiment, institute
State the three-stage cooling pattern for being cooled to water-cooled+air cooling+water-cooled stage by stage；In specific implementation process, by hot rolled plate first quick water-cooled
To 650～700 DEG C, the air cooling of 5～10s is then carried out, water-cooled is finally carried out again to 580～620 DEG C.Using three-stage cooling mould
Formula, controls temperature and air cooling time after suitable one section of water-cooled, realizes that rationally control ferrite is separated out, it is ensured that matrix possesses
Excellent uniformity.Control first stage water-cooled cooling rate be 20～60 DEG C/s, phase III water-cooled cooling rate be 20～60 DEG C/
S, is conducive to ferritic precipitation.
Hot rolled coil is cooled to after room temperature to carry out smooth, controls smooth elongation percentage 1%～3%.
Pickling is carried out to the hot rolled coil after smooth, in the present embodiment, using shallow slot turbulent flow type pickling, strip steel operation speed is controlled
Spend for 60m/min～100m/min, and control last descaling bath pickling temperature for 80～90 DEG C, iron concentration be 30～
40g/L。
After pickling, belt steel surface color is canescence, then through drying, after batching after two-sided electrostatic painting anticorrosive oil, packing
Become finished product, internal microstructure is produced for ferritic hot rolling acid-cleaning strip steel.
By the above as can be seen that the producer of the hot rolling acid-cleaning strip steel with high reaming performance of present invention offer
Method, by the chemical composition for optimizing strip steel, while constant speed rolling is adopted in production technology so that the organizational controls of entire volume and group
Knit ratio stable in target zone, stability is ensured very well；Using three-stage cooling pattern, it is suitable one section to control
Temperature and air cooling time after water-cooled, realize that rationally control ferrite is separated out, and ensure that matrix possesses excellent uniformity.Root
The hot rolling acid-cleaning strip steel produced according to the present embodiment has following performance：Tensile strength >=980MPa, hole expansibility λ >=110% extend
Rate >=20%.
It is for a more detailed description to the present invention by the following examples.These embodiments are only to optimal embodiment party of the invention
The description of formula, does not have any restriction to the scope of the present invention.
The hot rolling acid-cleaning band steel chemical composition of the embodiment of the present invention is as shown in table 1.
1 embodiment hot rolling acid-cleaning of table band composition of steel (%, remaining is Fe and inevitable impurity)
| Embodiment | C | Si | Mn | P | S | Nb | Ti | Mo | Re |
| Embodiment 1 | 0.05 | 0.08 | 1.0 | 0.015 | 0.001 | 0.02 | 0.1 | 0.13 | 0.3 |
| Embodiment 2 | 0.09 | 0.03 | 1.1 | 0.012 | 0.002 | 0.015 | 0.07 | 0.10 | 0.10 |
| Embodiment 3 | 0.03 | 0.08 | 1.4 | 0.015 | 0.002 | 0.035 | 0.09 | 0.13 | 0.20 |
| Embodiment 4 | 0.1 | 0.05 | 0.5 | 0.017 | 0.003 | 0.03 | 0.08 | 0.12 | 0.4 |
The steel Jing of the heterogeneity shown in table 1 is smelted and post-heating is cast, the technique processing as shown in table 2 obtains tension
Intensity 980MPa level has the hot rolling acid-cleaning strip steel of high reaming performance.
The technology controlling and process and hot rolling acid-cleaning strip property of the embodiment of the present invention is as shown in table 2.
2 embodiment technology controlling and process of table and hot rolling acid-cleaning strip property
Fig. 1 is the organization chartss of the hot rolling acid-cleaning strip steel that the embodiment of the present invention 1 is obtained, as seen from Figure 1：The group of the strip steel
Ferrite is woven to, and possesses excellent uniformity, show to obtain using the composition design and technology controlling and process in the embodiment of the present invention
Single-phase ferrite destination organization.
One or more technical schemes provided in the embodiment of the present invention, at least have the following technical effect that or advantage：
1st, the hot rolling acid-cleaning strip steel with high reaming performance for providing in the embodiment of the present invention, using C-Mn-Nb-Ti-Mo
Component system, by adding rare earth element Re to optimize steel inclusion shape and size, eliminates to be originally present and rolls along steel
The ribbon MnS of directional spreding processed, improves the hole expansibility of steel；It is single-phase ferrite by optimizing tissue pattern, improves steel
Elongation percentage and hole expansibility；Tensile strength >=980MPa is ensured by the precipitation of second phase particles (Ti, Mo) C；So as to ensure to resist
Tensile strength 980MPa level hot rolling acid-cleaning steel has high hole expansibility and elongation percentage simultaneously.
The production method of the hot rolling acid-cleaning strip steel with high reaming performance for the 2nd, providing in the embodiment of the present invention, by optimization
The chemical composition of strip steel, is separated out using the three-stage cooling Schema control ferrite of water-cooled+air cooling+water-cooled, is made by constant speed rolling
Tissue ratio is stable, and coordinates smooth, acid cleaning process, obtains the hot rolling acid-cleaning that tensile strength 980MPa level has high reaming performance
Strip steel；Tensile strength >=the 980MPa of the hot rolling acid-cleaning strip steel of acquisition, hole expansibility λ >=110%, elongation percentage >=20% possess excellent
Different strip surface quality.
It should be noted last that, above specific embodiment only to illustrate technical scheme and unrestricted,
Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, which all should be covered
In the middle of scope of the presently claimed invention.
Claims (10)
1. a kind of hot rolling acid-cleaning strip steel with high reaming performance, it is characterised in that its chemical composition mass percent is：C：
0.03%～0.1%, Si：≤ 0.1%, Mn：0.5%～1.5%, P≤0.02%, S≤0.006%, Nb≤0.05%, Ti≤
0.1%th, Mo≤0.15%, Re：0.1%～0.4%, remaining is Fe and inevitable impurity；
The internal microstructure of the hot rolling acid-cleaning strip steel is ferrite.
2. there is the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 1, it is characterised in that the hot rolling acid-cleaning band
Tensile strength >=the 980MPa of steel.
3. there is the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 1, it is characterised in that the hot rolling acid-cleaning band
Hole expansibility λ >=110% of steel, elongation percentage >=20%.
4. it is a kind of as claimed in claim 1 with high reaming performance hot rolling acid-cleaning strip steel production method, it is characterised in that
Including：
After by molten iron pretreatment, slab is obtained through smelting and casting；
The slab is heated, then Jing rollings obtain hot rolled plate；Wherein, the rolling adopts constant speed rolling, and rolls speed
Degree control is in 5～10m/s；The rolling includes roughing and finish rolling, controls roughing final temperature for 1030～1130 DEG C, control essence
Final temperature is rolled for 850～900 DEG C；
The hot rolled plate is cooled down stage by stage, hot rolled coil after cooling, is coiled into；Wherein, it is described be cooled to stage by stage water-cooled+
The three-stage cooling pattern of air cooling+water-cooled；
After the hot rolled coil flattened, pickling, acquisition internal microstructure is ferritic strip steel.
5. there is the production method of the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 4, it is characterised in that described
Hot rolled plate thickness specification excursion is controlled in 1.8～5mm.
6. there is the production method of the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 4, it is characterised in that described
The three-stage cooling pattern of water-cooled+air cooling+water-cooled is specially：Hot rolled plate elder generation water-cooled is carried out into 5 to 650～700 DEG C, then～
The air cooling of 10s, finally carries out water-cooled again to 580～620 DEG C.
7. there is the production method of the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 4, it is characterised in that described
Hot rolled coil it is smooth it is front be first cooled to room temperature, control smooth elongation percentage 1%～3%.
8. there is the production method of the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 4, it is characterised in that control
The speed of service of the pickling is 60m/min～100m/min.
9. the production method of the hot rolling acid-cleaning strip steel with high reaming performance as described in claim 4 or 8, it is characterised in that
In the acid cleaning process, control last descaling bath pickling temperature for 80～90 DEG C, iron concentration and be controlled to 30～
40g/L。
10. there is the production method of the hot rolling acid-cleaning strip steel of high reaming performance as claimed in claim 4, it is characterised in that institute
State the tensile strength >=980MPa of hot rolling acid-cleaning strip steel, hole expansibility λ >=110%, elongation percentage >=20%.
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Cited By (8)
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| CN108048734A (en) * | 2017-11-16 | 2018-05-18 | 首钢集团有限公司 | A kind of tensile strength 700MPa grades of hot rolling Multiphase Steels and its production method |
| CN108570604A (en) * | 2018-04-28 | 2018-09-25 | 唐山钢铁集团有限责任公司 | A kind of high reaming steel band of 780MPa grades of hot rolling acid-cleaning and its production method |
| CN108998739A (en) * | 2018-08-01 | 2018-12-14 | 首钢集团有限公司 | A kind of hot rolling acid-cleaning strip and its production method with high reaming performance |
| CN108998740A (en) * | 2018-08-01 | 2018-12-14 | 首钢集团有限公司 | A kind of water heater liner bracket hot rolling acid-cleaning strip and its production method |
| CN109576569A (en) * | 2018-07-20 | 2019-04-05 | 首钢集团有限公司 | A kind of torsion beam of automobile steel and preparation method thereof |
| CN110512146A (en) * | 2019-09-05 | 2019-11-29 | 首钢集团有限公司 | A kind of super high strength hot rolled pickling reaming steel and its production method with Good All-around Property |
| CN112575267A (en) * | 2019-09-27 | 2021-03-30 | 宝山钢铁股份有限公司 | High-hole-expansion complex phase steel and manufacturing method thereof |
| CN114875337A (en) * | 2022-05-31 | 2022-08-09 | 东风商用车有限公司 | Method for obtaining high-strength steel roll-formed rim |
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| CN109576569A (en) * | 2018-07-20 | 2019-04-05 | 首钢集团有限公司 | A kind of torsion beam of automobile steel and preparation method thereof |
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