CN107299207A - High intensity steel belt for lifting and preparation method thereof - Google Patents
High intensity steel belt for lifting and preparation method thereof Download PDFInfo
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- CN107299207A CN107299207A CN201710576535.7A CN201710576535A CN107299207A CN 107299207 A CN107299207 A CN 107299207A CN 201710576535 A CN201710576535 A CN 201710576535A CN 107299207 A CN107299207 A CN 107299207A
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- band base
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- 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
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
-
- 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
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
- C10M2207/2815—Esters of (cyclo)aliphatic monocarboxylic acids used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
- C10M2219/024—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of esters, e.g. fats
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/243—Cold working
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/244—Metal working of specific metals
- C10N2040/246—Iron or steel
Abstract
The invention discloses a kind of high intensity steel belt for lifting and preparation method thereof, the preparation method includes：Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；The steel band base A is subjected to first time annealing, steel band base B is obtained；The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base C；The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 620 750 DEG C, and the time of second of annealing is 5 8h, obtains steel band base D；The steel band base D is subjected to section cooling, high intensity steel belt for lifting is obtained；Solve existing steel belt for lifting and there is the problem of intensity is not high, stable degree is poor and easily occurs bending.
Description
Technical field
The present invention relates to steel belt for lifting preparation field, in particular it relates to a kind of high intensity steel belt for lifting and preparation method thereof.
Background technology
At present, in order to improve the stable degree after various fuel tanks are installed, fuel tank bottom is generally provided with fuel tank and hung
Steel loading band, existing steel belt for lifting fuel tank has the defects such as intensity is not high, stable degree is poor, in addition in impact test process
In, also easily occur the situation of bending.
Therefore it provides a kind of intensity is higher, the not pliable high intensity to greatly improve the stable degree after fuel tank is installed
The problem of steel belt for lifting and preparation method thereof is urgent need to resolve of the present invention.
The content of the invention
It is an object of the invention to provide a kind of high intensity steel belt for lifting and preparation method thereof, existing steel belt for lifting is solved
It there is the problem of intensity is not high, stable degree is poor and easily occurs bending.
To achieve these goals, the invention provides a kind of preparation method of high intensity steel belt for lifting, the preparation side
Method includes：
（1）Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；
（2）The steel band base A is subjected to first time annealing, wherein, the temperature of annealing is 525-620 DEG C, first for the first time
The time of annealing is 8-12h, obtains steel band base B；
（3）The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base C；
（4）The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 620-750 DEG C, second
The time of secondary annealing is 5-8h, obtains steel band base D；
（5）The steel band base D is subjected to section cooling, high intensity steel belt for lifting is obtained；
Wherein, the raw material steel billet is made up of following weight percent composition：C：0.2%-0.22%, Si：0.05%-0.15%, Mn：
0.55%-0.65%, Ti：0.003%-0.005%, P：0.01%-0.04%, S：0.03%-0.06% and surplus Fe.
Present invention also offers a kind of high intensity steel belt for lifting, the high intensity steel belt for lifting is by above-mentioned preparation method system
.
By above-mentioned technical proposal, the invention provides a kind of preparation method of high intensity steel belt for lifting, the preparation side
Method includes：Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；The steel band base A is carried out the
Once make annealing treatment, wherein, the temperature of annealing is 525-620 DEG C for the first time, and the time of the first annealing is 8-12h, obtains steel band
Base B；The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base C；The steel band base C is carried out the
Double annealing is handled, wherein, the temperature of second of annealing is 620-750 DEG C, and the time of second of annealing is 5-8h, obtains steel band
Base D；The steel band base D is subjected to section cooling, high intensity steel belt for lifting is obtained；The present invention passes through the cold rolling place to raw material steel billet
The optimization of reason and annealing so that obtained steel belt for lifting possesses higher mechanical strength, and not flexible, and its thickness is public
Difference fluctuation is smaller so that the performance of steel band is more stablized.
Other features and advantages of the present invention will be described in detail in subsequent embodiment part.
Embodiment
The embodiment to the present invention is described in detail below.It should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The end points and any value of disclosed scope are not limited to the accurate scope or value herein, these scopes or
Value should be understood to comprising the value close to these scopes or value.For number range, between the endpoint value of each scope, respectively
It can be combined with each other between the endpoint value of individual scope and single point value, and individually between point value and obtain one or more
New number range, these number ranges should be considered as specific open herein.
The invention provides a kind of preparation method of high intensity steel belt for lifting, the preparation method includes：
（1）Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；
（2）The steel band base A is subjected to first time annealing, wherein, the temperature of annealing is 525-620 DEG C, first for the first time
The time of annealing is 8-12h, obtains steel band base B；
（3）The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base C；
（4）The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 620-750 DEG C, second
The time of secondary annealing is 5-8h, obtains steel band base D；
（5）The steel band base D is subjected to section cooling, high intensity steel belt for lifting is obtained；
Wherein, the raw material steel billet is made up of following weight percent composition：C：0.2%-0.22%, Si：0.05%-0.15%, Mn：
0.55%-0.65%, Ti：0.003%-0.005%, P：0.01%-0.04%, S：0.03%-0.06% and surplus Fe.
The present invention it is a kind of preferred embodiment in, in order that obtained steel band to possess more excellent machinery strong
Degree, the raw material of the cold-rolling emulsion includes butyl oleate, sulfuration cottonseed oil, phosphate, dimethicone and petroleum sodium sulfonate；
Wherein, relative to the butyl oleate of 100 parts by weight, the content of the sulfuration cottonseed oil is 5-15 parts by weight, the phosphoric acid
The content of ester is 20-40 parts by weight, and the content of the dimethicone is 5-10 parts by weight, and the consumption of the petroleum sodium sulfonate is
1-3 parts by weight.
The present invention it is a kind of preferred embodiment in, in order that obtained steel band to possess more excellent machinery strong
Degree, the steel band base B needs progress air-cooled before progress is cold rolling for the second time, and the speed of cooling is 15-25 DEG C/s.
The present invention it is a kind of preferred embodiment in, in order to further improve the hardness of obtained steel band, the layer
Stream cooling is using one kind in sparse cooling, sub-sectional cooling or back segment cooling.
The present invention it is a kind of preferred embodiment in, in order that obtained steel band to possess more excellent machinery strong
Degree, and bending resistance, the speed of section cooling is 10-15 DEG C/s.
Present invention also offers a kind of high intensity steel belt for lifting, the high intensity steel belt for lifting is by above-mentioned preparation method system
.
The present invention it is a kind of preferred embodiment in, the yield strength of the high intensity steel belt for lifting is 360-
400Mpa, tensile strength is 500-650Mpa, yield tensile ratio≤0.81, elongation percentage >=25%, welding crack sensibility indices P cm≤
0.25%。
The present invention will be described in detail by way of examples below.
Embodiment 1
Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；The steel band base A is carried out first
Secondary annealing, wherein, the temperature of annealing is 525 DEG C for the first time, and the time of the first annealing is 8h, obtains steel band base B, enters sector-style
Cold, the speed of cooling is 15 DEG C/s；The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base C；
The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 620 DEG C, the time of second of annealing
For 5h, steel band base D is obtained；The steel band base D is subjected to section cooling（Cooling velocity is 10 DEG C/s）, obtain high intensity lifting steel
Band A1；Wherein, the raw material steel billet is made up of following weight percent composition：C：0.2%, Si：0.05%, Mn：0.55%, Ti：
0.003%, P：0.01%, S：0.03% and surplus Fe；The raw material of the cold-rolling emulsion includes butyl oleate, sulfuration cottonseed oil, phosphorus
Acid esters, dimethicone and petroleum sodium sulfonate；Wherein, the butyl oleate relative to 100g, the content of the sulfuration cottonseed oil is
5g, the content of the phosphate is 20g, and the content of the dimethicone is 5g, and the consumption of the petroleum sodium sulfonate is 1g.
Embodiment 2
Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；The steel band base A is carried out first
Secondary annealing, wherein, the temperature of annealing is 620 DEG C for the first time, and the time of the first annealing is 12h, obtains steel band base B, is carried out
Air-cooled, the speed of cooling is 25 DEG C/s；The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base
C；The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 750 DEG C, second of annealing when
Between be 8h, obtain steel band base D；The steel band base D is subjected to section cooling（Cooling velocity is 15 DEG C/s）, obtain high intensity lifting
Steel band A2；Wherein, the raw material steel billet is made up of following weight percent composition：C：0.22%, Si：0.15%, Mn：
0.65%, Ti：0.005%, P：0.04%, S：0.06% and surplus Fe；The raw material of the cold-rolling emulsion include butyl oleate,
Sulfuration cottonseed oil, phosphate, dimethicone and petroleum sodium sulfonate；Wherein, the butyl oleate relative to 100g, the Vulcanizing Cotton
The content of seed oil is 15g, and the content of the phosphate is 40g, and the content of the dimethicone is 10g, the mahogany acid
The consumption of sodium is 3g.
Embodiment 3
Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；The steel band base A is carried out first
Secondary annealing, wherein, the temperature of annealing is 570 DEG C for the first time, and the time of the first annealing is 10h, obtains steel band base B, is carried out
Air-cooled, the speed of cooling is 20 DEG C/s；The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base
C；The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 680 DEG C, second of annealing when
Between be 6h, obtain steel band base D；The steel band base D is subjected to section cooling（Cooling velocity is 12 DEG C/s）, obtain high intensity lifting
Steel band A3；Wherein, the raw material steel billet is made up of following weight percent composition：C：0.21%, Si：0.1%, Mn：0.6%, Ti：
0.004%, P：0.02%, S：0.04% and surplus Fe；The raw material of the cold-rolling emulsion includes butyl oleate, sulfuration cottonseed oil, phosphorus
Acid esters, dimethicone and petroleum sodium sulfonate；Wherein, the butyl oleate relative to 100g, the content of the sulfuration cottonseed oil is
10g, the content of the phosphate is 30g, and the content of the dimethicone is 7g, and the consumption of the petroleum sodium sulfonate is 2g.
Comparative example 1
Carried out according to the method for embodiment 3, unlike, the raw material steel billet is made up of following weight percent composition：C：
0.1%, Si：0.03%, Mn：0.45%, Ti：0.002%, P：0.008%, S：0.02% and surplus Fe.
Comparative example 2
Carried out according to the method for embodiment 3, unlike, the raw material steel billet is made up of following weight percent composition：C：
0.25%, Si：0.2%, Mn：0.7%, Ti：0.006%, P：0.05%, S：0.07% and surplus Fe.
Table 1
| Embodiment is numbered | Yield strength（MPa） | Tensile strength（MPa） | Hardness（HV） |
| Embodiment 1 | 250 | 320 | 88 |
| Embodiment 2 | 245 | 325 | 85 |
| Embodiment 3 | 255 | 326 | 83 |
| Comparative example 1 | 180 | 155 | 65 |
| Comparative example 2 | 210 | 125 | 71 |
Steel belt for lifting A1-A3 obtained within the scope of the present invention, which is can be seen that, by upper table data possesses excellent mechanical performance,
And obtained steel belt for lifting D1 and D2 mechanical performance is relatively low outside the scope of the invention.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (7)
1. a kind of preparation method of high intensity steel belt for lifting, its spy is that the preparation method includes：
（1）Raw material steel billet is carried out in cold-rolling emulsion cold rolling for the first time, obtain steel band base A；
（2）The steel band base A is subjected to first time annealing, wherein, the temperature of annealing is 525-620 DEG C, first for the first time
The time of annealing is 8-12h, obtains steel band base B；
（3）The steel band base B is carried out in cold-rolling emulsion second cold rolling, obtain steel band base C；
（4）The steel band base C is carried out into second to make annealing treatment, wherein, the temperature of second of annealing is 620-750 DEG C, second
The time of secondary annealing is 5-8h, obtains steel band base D；
（5）The steel band base D is subjected to section cooling, high intensity steel belt for lifting is obtained；
Wherein, the raw material steel billet is made up of following weight percent composition：C：0.2%-0.22%, Si：0.05%-0.15%, Mn：
0.55%-0.65%, Ti：0.003%-0.005%, P：0.01%-0.04%, S：0.03%-0.06% and surplus Fe.
2. preparation method according to claim 1, wherein, the raw material of the cold-rolling emulsion includes butyl oleate, vulcanization
Cottonseed oil, phosphate, dimethicone and petroleum sodium sulfonate；
Wherein, relative to the butyl oleate of 100 parts by weight, the content of the sulfuration cottonseed oil is 5-15 parts by weight, the phosphoric acid
The content of ester is 20-40 parts by weight, and the content of the dimethicone is 5-10 parts by weight, and the consumption of the petroleum sodium sulfonate is
1-3 parts by weight.
3. preparation method according to claim 1 or 2, wherein, the steel band base B carry out second it is cold rolling before need into
Sector-style is cold, and the speed of cooling is 15-25 DEG C/s.
4. preparation method according to claim 3, wherein, the section cooling using sparse cooling, sub-sectional cooling or after
One kind in section cooling.
5. preparation method according to claim 4, wherein, the speed of section cooling is 10-15 DEG C/s.
6. a kind of high intensity steel belt for lifting, it is characterised in that high intensity steel belt for lifting any one in claim 1-5
Described preparation method is made.
7. high intensity steel belt for lifting according to claim 6, wherein, the yield strength of the high intensity steel belt for lifting is
360-400Mpa, tensile strength is 500-650Mpa, yield tensile ratio≤0.81, elongation percentage >=25%, welding crack sensibility index
Pcm≤0.25%。
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| CN201710576535.7A CN107299207A (en) | 2017-07-14 | 2017-07-14 | High intensity steel belt for lifting and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112024835A (en) * | 2020-07-27 | 2020-12-04 | 河北博远科技有限公司 | Production method of low-permeability cold-rolled stainless steel strip |
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