CN114622123A - Production method of wire rod for low-carbon steel cotton steel fiber for scraping filament and wire rod - Google Patents
Production method of wire rod for low-carbon steel cotton steel fiber for scraping filament and wire rod Download PDFInfo
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- CN114622123A CN114622123A CN202111278805.9A CN202111278805A CN114622123A CN 114622123 A CN114622123 A CN 114622123A CN 202111278805 A CN202111278805 A CN 202111278805A CN 114622123 A CN114622123 A CN 114622123A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 26
- 238000007790 scraping Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000000835 fiber Substances 0.000 title claims abstract description 23
- 229920000742 Cotton Polymers 0.000 title description 3
- 238000009749 continuous casting Methods 0.000 claims abstract description 25
- 210000002268 wool Anatomy 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000009628 steelmaking Methods 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 239000000498 cooling water Substances 0.000 claims abstract description 4
- 238000010891 electric arc Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000009987 spinning Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 3
- 230000010485 coping Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 239000012783 reinforcing fiber Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Continuous Casting (AREA)
- Inorganic Fibers (AREA)
Abstract
The invention discloses a production method of a wire rod for scraping low-carbon steel wool steel fiber of a filament, which comprises the following steps: steel making: melting furnace burden by using an electric arc furnace or an oxidation converter, and carrying out external refining treatment to obtain refined molten steel; continuous casting: when molten steel is continuously cast, the tundish is heated by induction, and the superheat degree of the molten steel is controlled to be 15-25 ℃; the electromagnetic stirring parameters of the crystallizer are that the current is 300-500A, and the stirring frequency is 1.0-4.0 Hz; the continuous casting cold area is cooled by water, the specific water amount is controlled to be 0.5-0.7L/Kg, and the cooling water flow is 3000 +/-25L/min; the invention discloses a production method of a wire rod for scraping low-carbon rigid fibers of filaments, which controls the heat preservation and feeding by controlling production parameters in production processes of steel making, continuous casting, steel rolling and the like, ensures the compactness of steel ingots, further ensures the strength, the toughness and the drawing length of finally prepared wire rods and the uniformity of the internal structure of the wire rods, and effectively controls the quality of finished wire rod products.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a production method of a wire rod for scraping low-carbon steel wool steel fibers of filaments and the wire rod.
Background
The steel wool steel fiber is mainly used for manufacturing living and industrial cleaning products and the reinforcing fiber of the brake pad of the small automobile; when the cleaning product is manufactured, the cost is low, the cleaning effect is achieved, the service life is effectively prolonged when the brake pad reinforcing fiber is manufactured, and the brake effect is good.
The production process of steel fiber production enterprises has the following characteristics: firstly, drawing with phi 6.5mm to phi 1.5-2.0 mm with large drawing deformation; secondly, the whole drawing process does not have any heat treatment and pickling process, so that the hardening rate of the wire rod in the later drawing stage is higher, and the requirement on the surface quality is very high during cotton scraping.
The existing technology needs the length, so that the hot-rolled wire rod for the steel fiber with high uniformity and high toughness needs to be organized to meet the subsequent production, and in view of the problems of large size of inclusions, large quantity density of the inclusions, low tensile strength and the like of the wire rod prepared by the production process in the technical field, the performance of the existing hot-rolled wire rod cannot meet the market demand.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for producing a wire rod for low carbon steel wool steel fiber for scraping filament, the method comprising the following steps:
steel making: melting furnace burden by using an electric arc furnace or an oxidation converter, carrying out external refining treatment to obtain refined molten steel, and regulating and controlling the components in the molten steel: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.18 percent and less than or equal to 0.23 percent, Mn is more than or equal to 0.95 percent and less than or equal to 1.05 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.02 percent, Fe is more than or equal to 98 percent and other inevitable impurities;
continuous casting: when molten steel is continuously cast, the tundish is heated by induction, and the superheat degree of the molten steel is controlled to be 15-25 ℃; stirring molten steel continuously through electromagnetic stirring of a crystallizer, wherein the electromagnetic stirring parameters of the crystallizer are that the current is 300-500A, and the stirring frequency is 1.0-4.0 Hz; the continuous casting cold area is cooled by water, the specific water amount is controlled to be 0.5-0.7L/Kg, and the cooling water flow is 3000 +/-25L/min; controlling the total reduction of the continuous casting billet to be 8-15 mm;
steel rolling: the steel blank is heated in a zone heating mode: the temperature of the first zone is 900-950 ℃, the temperature of the second zone is 960-1060 ℃, the temperature of the third zone is 1070-1140 ℃, and the initial rolling temperature is 970-1030 ℃; total time of three-zone heating of steel blank: 95 minutes to 115 minutes; precision rolling temperature: 940-970 ℃; spinning: before spinning, the steel wire is pinched by a pinch roll with a groove, and the spinning temperature is 890-910 ℃;
and (3) cooling: and closing all heat preservation degrees of the Stratemo line, closing all wind gears of the fan, and controlling the running speed of the conveying roller way to be 0.320-0.470 m/s.
In a further preferred embodiment of the present invention, the mold surface fluctuation in the continuous casting step is 80 ± 3%.
The wire rod for the low carbon steel wool steel fiber for scraping the filament comprises the following chemical components in percentage by mass: 0.07% of C, 0.19% of Si, 0.93% of Mn, 0.011% of P, 0.008% of S, 0.05% of Cr, 0.03% of Ni, 0.08% of Cu, and the balance of Fe and inevitable impurities, and has a diameter of 5.5mm, a tensile strength of 435MPa and a reduction of area of 78%.
The wire rod for the low carbon steel wool steel fiber for scraping the filament comprises the following chemical components in percentage by mass: 0.09% of C, 0.19% of Si, 0.92% of Mn, 0.011% of P, 0.011% of S, 0.03% of Cr, 0.03% of Ni, 0.08% of Cu, and the balance of Fe and trace impurities, the diameter is 6.5mm, the tensile strength is 472MPa, and the reduction of area is 80%.
The invention has the following beneficial effects:
the invention discloses a production method of a wire rod for scraping low-carbon steel fiber of a filament, which can control the quality of the wire rod by controlling production parameters in production processes of steel making, continuous casting, steel rolling and the like.
Detailed Description
The present invention will be described in further detail with reference to specific preferred embodiments.
A method for producing a wire rod for low carbon steel wool steel fiber for scraping filament, the method comprising the following steps:
steel making: melting furnace burden by using an electric arc furnace or an oxidation converter, carrying out external refining treatment to obtain refined molten steel, and regulating and controlling the components in the molten steel: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.18 percent and less than or equal to 0.23 percent, Mn is more than or equal to 0.95 percent and less than or equal to 1.05 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.02 percent, Fe is more than or equal to 98 percent and other inevitable impurities;
continuous casting: when molten steel is continuously cast, the tundish is heated by induction, and the superheat degree of the molten steel is controlled to be 15-25 ℃; the molten steel is stirred continuously through electromagnetic stirring of a crystallizer, and the electromagnetic stirring parameters of the crystallizer comprise that the current is 300-500A, the stirring frequency is 1.0-4.0 Hz, and the fluctuation of the liquid level of the crystallizer is 80 +/-3%; the continuous casting cold area is cooled by water, the specific water amount is controlled to be 0.5-0.7L/Kg, and the cooling water flow is 3000 +/-25L/min; controlling the total reduction of the continuous casting billet to be 8-15 mm;
steel rolling: the steel blank is heated in a partition heating mode: the temperature of the first zone is 900-950 ℃, the temperature of the second zone is 960-1060 ℃, the temperature of the third zone is 1070-1140 ℃, and the initial rolling temperature is 970-1030 ℃; total time of heating in three zones of steel blank: 95 minutes to 115 minutes; the finish rolling temperature is as follows: 940-970 ℃; spinning: before spinning, the spinning is carried out by a pinch roll with a groove, and the spinning temperature is 890-910 ℃;
and (3) cooling: and closing all heat preservation degrees of the Stratemo line, closing all wind gears of the fan, and controlling the running speed of the conveying roller way to be 0.320-0.470 m/s.
The wire rod for the low-carbon steel wool steel fiber for scraping the filament is prepared by the production method of the wire rod for the low-carbon steel wool steel fiber for scraping the filament, and the wire rod for the low-carbon steel wool steel fiber for scraping the filament comprises the following chemical components in percentage by mass: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.23 percent and less than or equal to 0.18 percent, Mn is more than or equal to 0.95 percent and less than or equal to 1.05 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.02 percent, and the balance is Fe and inevitable impurities, and the diameter of the prepared wire rod is 5.5mm-6.5mm, the tensile strength is less than or equal to 480MPa, and the reduction of area is more than or equal to 65 percent.
Example 1
The embodiment provides a low-carbon steel wool steel wire rod suitable for scraping filaments, which comprises the following chemical components in percentage by mass: 0.07% of C, 0.19% of Si, 0.93% of Mn, 0.011% of P, 0.008% of S, 0.05% of Cr, 0.03% of Ni, 0.08% of Cu, and the balance of Fe and trace impurities.
The embodiment provides a production method of a hot-rolled wire rod, which comprises the process control of steel making, continuous casting, cogging, coping, rolling, cooling and the like, and comprises the following specific process steps:
firstly, a tundish is adopted for induction heating during continuous casting, and the superheat degree of molten steel is controlled to be 23 ℃;
secondly, the electromagnetic stirring current of the crystallizer is 400A, the frequency is 4Hz, the water amount is controlled to be 3000L/min, and the fluctuation of the liquid level of the crystallizer is controlled to be 78 percent;
thirdly, dividing the continuous casting secondary cooling area into four areas, and cooling by water, wherein the specific water amount is controlled to be 0.5L/Kg;
fourthly, the continuous casting billet is lightly pressed, and the total pressing amount is controlled to be 11 mm;
fifthly, adopting a full grinding process to the small square billet with the continuous casting billet size of 140 multiplied by 140mm, and grinding the single side to the depth of 0.5 mm;
sixthly, controlling the rolling start rolling temperature to 990 ℃, the rolling speed to 105m/s, controlling the spinning temperature to 892 ℃, and cooling by adopting a stelmor line; the speed of the stelmor roller way is controlled at 0.40 m/s, the heat-insulating cover is completely closed, the wind gear of the fan is completely closed, and the fan is completely closed.
The method can obtain the low-carbon steel wool steel wire rod with the diameter of 5.5mm and suitable for scraping the filament, the tensile strength of the low-carbon steel wool steel wire rod is 435MPa, the reduction of area is 78%, and the microstructure is uniform ferrite and pearlite.
Example 2
The embodiment provides a low-carbon steel wool steel wire rod suitable for scraping filaments, which comprises the following chemical components in percentage by mass: 0.09% of C, 0.19% of Si, 0.92% of Mn, 0.011% of P, 0.011% of S, 0.03% of Cr, 0.03% of Ni, 0.08% of Cu, and the balance of Fe and trace impurities.
The embodiment provides a production method of a hot-rolled wire rod, which comprises the process control of steel making, continuous casting, cogging, coping, rolling, cooling and the like, and comprises the following specific process steps of:
firstly, a tundish is adopted for induction heating during continuous casting, and the superheat degree of molten steel is controlled to be 22 ℃;
secondly, the electromagnetic stirring current of the crystallizer is 400A, the frequency is 4Hz, the water amount is controlled to be 3000L/min, and the fluctuation of the liquid level of the crystallizer is controlled to be 79 percent;
thirdly, dividing the continuous casting secondary cooling area into four areas, and cooling by water, wherein the specific water amount is controlled to be 0.5L/Kg;
fourthly, the continuous casting billet is lightly pressed, and the total pressing amount is controlled to be 12 mm;
fifthly, adopting a full grinding process to the small square billet with the continuous casting billet size of 140 multiplied by 140mm, and grinding the single side to the depth of 0.6 mm;
sixthly, controlling the rolling start temperature to be 1100 ℃, the rolling speed to be 100m/s, controlling the spinning temperature to be 903 ℃, and cooling by adopting a stelmor line; the stelmor roller way speed is controlled at 0.45m/s, the heat preservation cover is closed completely, the fan wind shield is closed completely, and the fan is closed completely.
The method can obtain the low-carbon steel wool steel wire rod with the diameter of 6.5mm and suitable for scraping the filament, the tensile strength of the low-carbon steel wool steel wire rod is 472MPa, the reduction of area is 80%, and the microstructure is uniform ferrite and pearlite.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (4)
1. A production method of a wire rod for low-carbon steel wool steel fibers for scraping filaments is characterized by comprising the following steps: the production method comprises the following steps:
steel making: melting furnace burden by using an electric arc furnace or an oxidation converter, carrying out external refining treatment to obtain refined molten steel, and regulating and controlling the components in the molten steel: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.18 percent and less than or equal to 0.23 percent, Mn is more than or equal to 0.95 percent and less than or equal to 1.05 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.02 percent, Fe is more than or equal to 98 percent and other inevitable impurities;
continuous casting: when molten steel is continuously cast, the tundish is heated by induction, and the superheat degree of the molten steel is controlled to be 15-25 ℃;
stirring molten steel continuously through electromagnetic stirring of a crystallizer, wherein the electromagnetic stirring parameters of the crystallizer are that the current is 300-500A, and the stirring frequency is 1.0-4.0 Hz;
the continuous casting cold area is cooled by water, the specific water amount is controlled to be 0.5-0.7L/Kg, and the cooling water flow is 3000 +/-25L/min;
controlling the total reduction of the continuous casting billet to be 8-15 mm;
steel rolling: the steel blank is heated in a zone heating mode: the temperature of the first zone is 900-950 ℃, the temperature of the second zone is 960-1060 ℃, the temperature of the third zone is 1070-1140 ℃, and the initial rolling temperature is 970-1030 ℃; total time of heating in three zones of steel blank: 95 minutes to 115 minutes; the finish rolling temperature is as follows: 940-970 ℃; spinning: before spinning, the spinning is carried out by a pinch roll with a groove, and the spinning temperature is 890-910 ℃;
and (3) cooling: and closing all heat preservation degrees of the Stratemo line, closing all wind gears of the fan, and controlling the running speed of the conveying roller way to be 0.320-0.470 m/s.
2. The method for producing a wire rod for a low carbon steel wool steel fiber for a scraping filament as set forth in claim 1, wherein: in the continuous casting process, the fluctuation of the liquid level of the crystallizer is 80 +/-3%.
3. A wire rod for low carbon steel wool steel fiber for scraping filament is characterized in that: the production method of the wire rod for the low carbon steel wool steel fiber for the scraping filament of any one of claims 1-2 is adopted, and the chemical components and the mass percentages of the wire rod for the low carbon steel wool steel fiber for the scraping filament comprise: 0.07% of C, 0.19% of Si, 0.93% of Mn, 0.011% of P, 0.008% of S, 0.05% of Cr, 0.03% of Ni, 0.08% of Cu, and the balance of Fe and inevitable impurities, and has a diameter of 5.5mm,
the tensile strength is 435MPa, and the reduction of area is 78%.
4. A wire rod for low carbon steel wool steel fiber for scraping filament is characterized in that: the production method of the wire rod for the low carbon steel wool steel fiber for the scraping filament of any one of claims 1-2 is adopted, and the chemical components and the mass percentages of the wire rod for the low carbon steel wool steel fiber for the scraping filament comprise: 0.09% of C, 0.19% of Si, 0.92% of Mn, 0.011% of P, 0.011% of S, 0.03% of Cr, 0.03% of Ni, 0.08% of Cu, and the balance of Fe and trace impurities, the diameter is 6.5mm, the tensile strength is 472MPa, and the reduction of area is 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278805.9A CN114622123A (en) | 2021-10-31 | 2021-10-31 | Production method of wire rod for low-carbon steel cotton steel fiber for scraping filament and wire rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278805.9A CN114622123A (en) | 2021-10-31 | 2021-10-31 | Production method of wire rod for low-carbon steel cotton steel fiber for scraping filament and wire rod |
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| CN114622123A true CN114622123A (en) | 2022-06-14 |
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| CN202111278805.9A Pending CN114622123A (en) | 2021-10-31 | 2021-10-31 | Production method of wire rod for low-carbon steel cotton steel fiber for scraping filament and wire rod |
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| Title |
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| 全国造价工程师职业资格考试培训教材编审委员会等: "《全国一级造价工程师职业资格考试培训教材 建设工程技术与计量 土木建筑工程 2019版》", 科学普及出版社, pages: 117 - 118 * |
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