CN114231696A - Alloy cored wire and preparation method and application thereof - Google Patents
Alloy cored wire and preparation method and application thereof Download PDFInfo
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- CN114231696A CN114231696A CN202111463042.5A CN202111463042A CN114231696A CN 114231696 A CN114231696 A CN 114231696A CN 202111463042 A CN202111463042 A CN 202111463042A CN 114231696 A CN114231696 A CN 114231696A
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- alloy
- cored wire
- core layer
- microalloy
- ferrovanadium
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 91
- 239000000956 alloy Substances 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000012792 core layer Substances 0.000 claims abstract description 52
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 44
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims abstract description 40
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims abstract description 40
- 150000004767 nitrides Chemical class 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 239000010955 niobium Substances 0.000 claims description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- XFQFYIBHSMJFSH-UHFFFAOYSA-N [Si].[N].[V] Chemical compound [Si].[N].[V] XFQFYIBHSMJFSH-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 abstract description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 229910001199 N alloy Inorganic materials 0.000 description 8
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 8
- 239000002131 composite material Substances 0.000 description 4
- 229910000640 Fe alloy Inorganic materials 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 229910001337 iron nitride Inorganic materials 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000009036 growth inhibition Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention discloses an alloy cored wire and a preparation method and application thereof, and belongs to the technical field of metallurgical cored wires. It includes: the core layer and the outer layer are positioned outside the core layer and wrap the core layer; the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy. According to the alloy cored wire, the mixture of the core layer is composed of the ferro-silicon nitride alloy and the ferrovanadium powder microalloy, the ferrovanadium powder microalloy with relatively high production price is replaced for steel-making production, the V/N ratio can be adjusted according to the component adjustment requirement of the steel grade, the nitrogen content can be increased according to the requirement without influencing the vanadium content, and the nitrogen recovery rate is high and stable.
Description
Technical Field
The invention relates to the technical field of core-spun yarns for metallurgy, in particular to an alloy core-spun yarn and a preparation method and application thereof, and the alloy core-spun yarn has wide application prospect in the production field of high-strength deformed steel bars such as HRB400, HRB500 and the like.
Background
In recent years, vanadium-nitrogen alloy is used as the most economic and effective additive of high-strength low-alloy steel and is widely applied to the production of low-alloy steel such as high-strength hot-rolled ribbed steel bars and the like. However, the production cost of the vanadium-nitrogen alloy is high in the production process, so that the price of the vanadium-nitrogen alloy is relatively expensive, but the maximum content of N in the alloy is 12-16%, and if a large amount of V in steel is used alone, the effects of precipitation strengthening and grain growth inhibition are not achieved, and the waste of V in the steel is large, so that the alloying cost is high.
The related technical solutions for the core-spun yarn of silicon iron nitride are disclosed, such as: the invention discloses a Chinese patent application number 201210377151.X, which discloses a vanadium-nitrogen microalloying and composite deoxidizing cored wire for metallurgy; the invention of Chinese patent application No. 201410131544.1 discloses composite nitrogen alloy cored wire and a preparation method thereof; the Chinese patent application No. 201320280835.8 is entitled "silicon manganese nitride cored wire for nitrogen increase of vanadium microalloyed steel"; chinese patent application No. 201410705711.9 "A core-spun yarn of ferro-silicon nitride alloy and its manufacturing method". None of the patents disclosed in the above patent documents mention the alloying method of adding ferrosilicon nitride and ferrovanadium to molten steel at the same time.
Disclosure of Invention
The invention aims to provide an alloy cored wire and a preparation method and application thereof, and aims to solve the problem of high cost of the existing vanadium-nitrogen alloy.
The technical scheme for solving the technical problems is as follows:
an alloy cored wire comprising: the core layer and the outer layer are positioned outside the core layer and wrap the core layer;
the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
Based on the enhanced precipitation effect of N element in vanadium-containing steel, in order to reduce production cost, ferrosilicon nitride with reduced production cost can be used as a vanadium-containing alloy steel nitrogen increasing agent, ferrosilicon and ferrosilicon nitride are prepared into alloy cored wires according to a certain proportion, and meanwhile, in the production of high-strength deformed steel bar, a part of ferrosilicon alloy needs to be added, and the use of ferrosilicon nitride can also reduce the usage amount of ferrosilicon. Under the same production process conditions, after the composite alloy cored wire is fed into the steel, the mechanical performance indexes of yield, tensile strength, elongation and the like of the produced RHB400E steel are superior to those of the produced RHB, namely the produced RHB, the produced RHB and the produced steel are superior to those of the produced RHB, the produced RHB and the produced steel, namely the produced RHB, the produced RHB and the produced steel, the produced RHB and the produced steel, the composite alloy and the alloy, the vanadium and the alloy, and the more than the reduction of the equal production process, under the production process, under the equal production process, under the production process, the.
Further, in the mixture of the core layer, by weight, 50-70 parts of ferrovanadium alloy, 30-50 parts of ferrosilicon nitride and 10-15 parts of microalloy are added.
Further, in the mixture of the core layer, by weight, 55-65 parts of ferrovanadium alloy, 35-45 parts of ferrosilicon nitride and 10-15 parts of microalloy.
Further, the microalloy includes: niobium and titanium in a mass ratio of 1: (2-5).
Further, the V content of the ferrovanadium alloy is 50-80%, and the balance is Fe and other inevitable impurity elements.
Further, the silicon iron nitride contains 26-36% of N, 48-58% of Si and the balance of a small amount of Fe and inevitable other impurity elements.
Furthermore, the mixture of the core layer is powder, and the particle size of the powder is less than 3 mm.
Furthermore, the outer layer is made of iron sheet or steel sheet, and the thickness of the outer layer is 0.35-0.45 mm.
The invention also provides a preparation method of the alloy cored wire, which comprises the following steps: and mixing the crushed ferrovanadium alloy, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
The invention also provides application of the alloy cored wire in preparation of vanadium-nitrogen-silicon alloyed molten steel.
The invention has the following beneficial effects:
1. according to the alloy cored wire, the mixture of the core layer is composed of the ferro-silicon nitride alloy and the ferrovanadium powder microalloy, the ferrovanadium powder microalloy with relatively high production price is replaced for steel-making production, the V/N ratio can be adjusted according to the component adjustment requirement of the steel grade, the nitrogen content can be increased according to the requirement without influencing the vanadium content, and the nitrogen recovery rate is high and stable.
2. According to the manufacturing method of the alloy cored wire, the components in the core powder are accurately prepared, the core powder is coated into the alloy cored wire with the diameter of 9-13 mm by the outer layer, the alloy cored wire is fed into the deep part of molten steel by the wire feeding equipment, V, N alloy is more uniformly distributed in the molten steel, the yield is higher, and the production cost of vanadium-nitrogen alloying of the molten steel is reduced.
3. The invention realizes the full precipitation of second phase particles by the microalloy and the combination of the microalloy and the nitrogen element in the molten steel, so that the steel has higher mechanical property.
Detailed Description
The principles and features of this invention are described below in conjunction with embodiments, which are included to explain the invention and not to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that, in the present invention, the ferrosilicon nitride alloy and the ferrovanadium alloy are firstly crushed, and the preparation method thereof is as follows:
preparing the silicon-iron nitride alloy: and crushing the silicon nitride iron alloy by using crushing equipment to prepare powder with the particle size of 0-3 mm, wherein the powder with the particle size of 1-3 mm accounts for 20-40% of the total mass of the silicon nitride iron alloy, and mixing to obtain the silicon nitride iron alloy. In the ferrosilicon nitride, the content of N is 26-36%, the content of Si is 48-58%, and the balance is a small amount of Fe and inevitable other impurity elements.
Preparing a ferrovanadium alloy: crushing the ferrovanadium alloy by using crushing equipment to prepare powder with the particle size of 0-3 mm, wherein the powder with the particle size of 1-3 mm accounts for 20-40% of the total mass of the ferrosilicon nitride alloy, and mixing to obtain the ferrovanadium alloy. The V content in the ferrovanadium alloy is 50-80%, and the balance is Fe and other inevitable impurity elements.
And similarly, crushing the microalloy by using crushing equipment to prepare powder with the particle size of 0-3 mm.
Example 1:
the alloy cored wire of the embodiment comprises: the core layer and the outer layer are positioned outside the core layer and wrap the core layer; the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
In the mixture of the core layer, by weight, 50 parts of ferrovanadium alloy, 30 parts of ferrosilicon nitride and 10-15 parts of microalloy. The microalloy includes: niobium and titanium in a mass ratio of 1: 2.
the preparation method of the alloy cored wire of the embodiment comprises the following steps: and mixing the crushed ferrovanadium alloy, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
Example 2:
the alloy cored wire of the embodiment comprises: the core layer and the outer layer are positioned outside the core layer and wrap the core layer; the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
In the mixture of the core layer, by weight, 55 parts of ferrovanadium alloy, 35 parts of ferrosilicon nitride and 10 parts of microalloy are calculated by weight. The microalloy includes: niobium and titanium in a mass ratio of 1: 3.
the preparation method of the alloy cored wire of the embodiment comprises the following steps: and mixing the crushed ferrovanadium alloy, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
Example 3:
the alloy cored wire of the embodiment comprises: the core layer and the outer layer are positioned outside the core layer and wrap the core layer; the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
In the mixture of the core layer, by weight, 60 parts of crushed ferrovanadium alloy, 40 parts of ferrosilicon nitride and 12 parts of microalloy are calculated. The microalloy includes: niobium and titanium in a mass ratio of 1: 4.
the preparation method of the alloy cored wire of the embodiment comprises the following steps: mixing ferrovanadium, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
Example 4:
the alloy cored wire of the embodiment comprises: the core layer and the outer layer are positioned outside the core layer and wrap the core layer; the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
In the mixture of the core layer, by weight, 65 parts of ferrovanadium alloy, 45 parts of ferrosilicon nitride and 15 parts of microalloy. The microalloy includes: niobium and titanium in a mass ratio of 1: 3.5.
the preparation method of the alloy cored wire of the embodiment comprises the following steps: mixing ferrovanadium, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
Example 5:
the alloy cored wire of the embodiment comprises: the core layer and the outer layer are positioned outside the core layer and wrap the core layer; the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
In the mixture of the core layer, by weight, 70 parts of ferrovanadium alloy, 50 parts of ferrosilicon nitride and 15 parts of microalloy. The microalloy includes: niobium and titanium in a mass ratio of 1: 5.
the preparation method of the alloy cored wire of the embodiment comprises the following steps: mixing ferrovanadium, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
Test example 1
The preparation method of the alloy cored wire of the test example comprises the following specific steps: and uniformly mixing the crushed ferrosilicon nitride, ferrovanadium alloy and microalloy according to 35 parts of ferrosilicon nitride, 65 parts of ferrovanadium alloy and 10 parts of microalloy. The cored wire with the diameter of 13mm is coated by core powder of a steel belt with the thickness of 0.40 mm. The weight of core powder of the prepared core-spun yarn is more than or equal to 210g/m, the weight of the core-spun yarn is more than or equal to 380g/m, specifically, the weight of the core powder is 212g/m in the test example, and the weight of the core-spun yarn of the ferro-silicon nitride alloy is 395 g/m.
When HRB500 steel is produced, alloy cored wires are fed in an LF refining station through a wire feeding machine, the feeding amount is 4.5 m/ton of steel, the yield of V, N, Si elements in molten steel is 91%, 82% and 90% respectively, and the current vanadium-nitrogen alloy yield level is reached.
Test example 2
The preparation method of the alloy cored wire of the test example comprises the following specific steps: and uniformly mixing the crushed ferrosilicon nitride, ferrovanadium alloy and microalloy according to the weight proportion of the ferrosilicon nitride (40 parts), the ferrovanadium alloy (60 parts) and the microalloy (15 parts). The cored wire with the diameter of 13mm is coated by core powder of a steel belt with the thickness of 0.40 mm. The weight of core powder of the prepared core-spun yarn is more than or equal to 205g/m, the weight of the core-spun yarn is more than or equal to 375g/m, specifically, the weight of the core powder is 207g/m in the test example, and the weight of the core-spun yarn of the ferro-silicon nitride alloy is 382 g/m.
When HRB500 steel is produced, alloy cored wires are fed in an LF refining station through a wire feeding machine, the feeding amount is 5.3 m/ton of steel, the yield of V, N, Si elements in molten steel is 92%, 85% and 87%, respectively, and the current vanadium-nitrogen alloy yield level is reached.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An alloy cored wire, comprising: the core layer and the outer layer are positioned outside the core layer and wrap the core layer;
the core layer is a mixture containing ferrovanadium alloy, ferrosilicon nitride and microalloy.
2. The alloy cored wire of claim 1, wherein the mixture of the core layer comprises 50 to 70 parts by weight of ferrovanadium, 30 to 50 parts by weight of ferrosilicon nitride, and 10 to 15 parts by weight of microalloy.
3. The alloy cored wire of claim 2, wherein the mixture of the core layer comprises 55 to 65 parts by weight of ferrovanadium, 35 to 45 parts by weight of ferrosilicon nitride, and 10 to 15 parts by weight of microalloy.
4. An alloy cored wire of any one of claims 1 to 3, wherein the micro alloy comprises: niobium and titanium in a mass ratio of 1: (2-5).
5. The alloy cored wire of claim 4, wherein the V content in the ferrovanadium alloy is 50-80%, and the balance is Fe and other inevitable impurity elements.
6. The alloy cored wire of claim 4, wherein the ferrosilicon nitride contains 26 to 36% of N, 48 to 58% of Si, and a small amount of Fe and inevitable other impurity elements as the rest.
7. The alloy cored wire of claim 4, wherein the mixture of the core layer is powder, and the particle size of the powder is less than 3 mm.
8. The alloy cored wire of claim 4, wherein the outer layer is made of iron sheet or steel sheet, and the thickness of the outer layer is 0.35-0.45 mm.
9. The method of making an alloy cored wire of any of claims 1 to 8, comprising the steps of: and mixing the crushed ferrovanadium alloy, ferrosilicon nitride and microalloy to obtain core powder, and coating the core powder into a core layer with the diameter of 9-13 mm through an outer layer to obtain the alloy cored wire.
10. Use of the alloy cored wire of any one of claims 1 to 9 for the preparation of vanadium nitrogen silicon alloyed molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111463042.5A CN114231696A (en) | 2021-12-02 | 2021-12-02 | Alloy cored wire and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111463042.5A CN114231696A (en) | 2021-12-02 | 2021-12-02 | Alloy cored wire and preparation method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966396A (en) * | 2014-04-03 | 2014-08-06 | 陈来祥 | Compound nitrogen alloy core spun yarn and preparation method thereof |
| CN104032077A (en) * | 2014-06-10 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloyed steel, cored wire containing iron alloys, application of cored wire, molten steel and preparation method of molten steel |
| CN104032072A (en) * | 2014-06-10 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloyed steel, cored wire containing iron alloys and silicon-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
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2021
- 2021-12-02 CN CN202111463042.5A patent/CN114231696A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966396A (en) * | 2014-04-03 | 2014-08-06 | 陈来祥 | Compound nitrogen alloy core spun yarn and preparation method thereof |
| CN104032077A (en) * | 2014-06-10 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloyed steel, cored wire containing iron alloys, application of cored wire, molten steel and preparation method of molten steel |
| CN104032072A (en) * | 2014-06-10 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloyed steel, cored wire containing iron alloys and silicon-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
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Application publication date: 20220325 |