CN109628829A - A kind of spiral and preparation method thereof - Google Patents
A kind of spiral and preparation method thereof Download PDFInfo
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- CN109628829A CN109628829A CN201811620161.5A CN201811620161A CN109628829A CN 109628829 A CN109628829 A CN 109628829A CN 201811620161 A CN201811620161 A CN 201811620161A CN 109628829 A CN109628829 A CN 109628829A
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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
- 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
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of spiral, the chemical component of the spiral are as follows: C is 0.22~0.25wt%；Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；Remaining is Fe and inevitable impurity.The present invention also provides a kind of preparation methods of spiral.It is simple that the invention has the following beneficial effects: technological operations, does not change existing smelting and rolling equipment, reduces temperature on cooling table and promotes cold bed production capacity, thus can suitably increase rolling mill yield, and cost of alloy is greatly reduced；The comprehensive utilization for realizing low price resource reduces the use of niobium, vanadium etc., environmental pressure caused by promoting steel enterprise economic benefit, reducing because of resources such as exploitation niobium, vanadium；The production that spiral low cost can be achieved, greatly improves spiral production level.
Description
[technical field]
The present invention relates to technical field of ferrous metallurgy more particularly to a kind of spiral and preparation method thereof.
[background technique]
Spiral new standard (GB/T 1499.2-2018) is implemented on November 1st, 2018, and new standard increases macro
See metallographic structure, microstructure, the method for inspection of section Vickers hardness.After new standard executes, tempering horse is generated after reinforcing bar rolling
The immediate quenching technique (wearing hydraulic art by force) of family name's body tissue has been eliminated, if without multicomponent alloy optimum organization (alloy strengthening
Combination) and cooling controlling and rolling controlling process Optimal improvements, being bound to can only be by being greatly improved containing for the elements such as silicon in steel, manganese, vanadium, niobium
Amount is to meet requirement of the new standard to microstructure and property.(VN alloy price is more than 60 to recent VN alloy big bulge in price at present
Ten thousand, the vanadium of every increase by 0.01%, ton steel cost increases nearly 80 yuan；Ferrocolumbium price is more than 400,000, the niobium of every increase by 0.01%,
Ton steel cost increases nearly 50 yuan), silicon, manganese alloy price also have biggish rising range, this production cost band to spiral
Heavy pressure is carried out.Therefore, niobium, the vanadium equal size in steel are reduced, to vanadium, niobium resource is saved, promotes Iron and Steel Enterprises in China warp
Ji benefit reduces environmental pressure and has important practical significance.
Under vertical bar spiral (diameter 12-32mm) traditional processing technology and appointed condition, the one of reinforced steel bar strength is improved
As approach are as follows: 1) combine and control cold technique, carry out the microalloy treatments such as Nb, V, Ti, B, increase precipitating reinforcing effect；2) increase C,
The content of the solution strengthening elements such as Si, Mn, Cr improves solid solution strengthening effect；3) it carries out controlled rolling and control cools down, increase phase
Become the effect strengthened with refined crystalline strengthening.
In the related art, after spiral new standard (GB/T 1499.2-2018) executes, using rolling rear immediate quenching
The method of technique (wearing hydraulic art by force) Lai Zengjia phase transformation strengthening and promotion refined crystalline strengthening certainly will be eliminated.Thus do not add it is valuable
On the basis of metal niobium and vanadium, expensive alloying elements are replaced to guarantee precipitating reinforcing effect using relatively inexpensive alloying element, it is excellent
Change combination solution strengthening element and increase solution strengthening, and technique is controlled by cooling control after rolling and roller repairing condition of water quality and is guaranteed
The effect of refined crystalline strengthening prevents reinforcing bar cold bed from corroding, is present invention process under the premise of meeting new national standard performance and organizational requirements
Where key technology, this production method will promote the economic benefit of iron and steel enterprise energetically.
[summary of the invention]
The present invention provides a kind of preparation method of spiral, after set smelting molten steel, slab heating, spiral roll
The innovative technology controlling cold, quality of cooling water control and complex intensifying alloy preparation and using, is the weight for promoting industry technology development
Want method.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
A kind of spiral, the chemical component of the spiral are as follows: C is 0.22~0.25wt%；Si be 0.5~
0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；Remaining is for Fe and unavoidably
Impurity.
The present invention also provides a kind of preparation methods of spiral, include the following steps:
After the completion of smelting molten steel, 0.1-0.5kg/ tons of steel are added in molten steel contains aluminium deoxidizer；
Silicomangan is added in molten steel, and answering for 0.3-0.8kg/ tons of steel is added during silicomangan is added
Reinforced alloys are closed, the complex intensifying alloy is made of nitrogen, titanium, boron, silicon, manganese, carbon and rare earth；
Molten steel enters argon station, stirs 3 minutes or more under big argon atmosphere, the Composition Control of molten steel is existed: C be 0.22~
0.25wt%；Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；
Molten steel is poured and builds up continuous casting billet；
Continuous casting billet is heated, heating time controlled in 180 minutes, and soaking temperature is no more than 1200 DEG C；
By the continuous casting billet milling after heating at reinforcing bar；
Reinforcing bar is cooling in cooling water, water pressure of cooling water in 0.4MPa or more, cooling water ph value in 6.5-7.5, chlorine from
Sub- content is less than 100mg/L, and turbidity is less than 20NTU；
Cold bed on reinforcing bar after cooling is replied, wherein cold bed recovery temperature is in 820-900 on diameter 12-18mm reinforcing bar
DEG C, cold bed recovery temperature cold bed recovery temperature on 830-900 DEG C, diameter 28-40mm reinforcing bar exists on the reinforcing bar of diameter 20-25mm
840-900℃。
Preferably, after the completion of smelting molten steel, if in molten steel carbon content be lower than 0.05%, in molten steel increase by 20% with
On contain aluminium deoxidizer.
The invention has the following beneficial effects:
1, technological operation is simple, does not change existing smelting and rolling equipment, reduces temperature on cooling table and promotes cold bed production
Ability, thus can suitably increase rolling mill yield, cost of alloy is greatly reduced, can be pushed away in the enterprise that any screw-thread steel produces
It is wide to use；
2, the comprehensive utilization for realizing low price resource, reduces the use of niobium, vanadium etc., promoted steel enterprise economic benefit,
Environmental pressure caused by reducing because of resources such as exploitation niobium, vanadium；
3, the production that spiral low cost can be achieved, greatly improves spiral production level, is that spiral is raw
The novel technique that the enterprise of production is worthy to be popularized can bring preferable economic benefit and social benefit.
[Detailed description of the invention]
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, in which:
Fig. 1 is the preparation method flow diagram of spiral of the present invention；
Fig. 2 is the spiral metallographic structure shape appearance figure of embodiment 1 of the present invention preparation；
Fig. 3 is the spiral pictorial diagram of embodiment 1 of the present invention preparation；
Fig. 4 is the spiral metallographic structure shape appearance figure of embodiment 2 of the present invention preparation；
Fig. 5 is the spiral pictorial diagram of embodiment 2 of the present invention preparation.
[specific embodiment]
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of spiral, the chemical component of the spiral are as follows: C is 0.22~0.25wt%；
Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；Remaining for Fe and
Inevitable impurity.
Refering to Figure 1, including the following steps: the present invention also provides a kind of preparation method of spiral
After the completion of smelting molten steel, 0.1-0.5kg/ tons of steel are added in molten steel contains aluminium deoxidizer；
In above-mentioned steps, if being added containing after aluminium deoxidizer, if carbon content is lower than 0.05% in molten steel, completed in smelting molten steel
Afterwards, then in molten steel increase by 20% or more contain aluminium deoxidizer.
Silicomangan is added in molten steel, and answering for 0.3-0.8kg/ tons of steel is added during silicomangan is added
Reinforced alloys are closed, the complex intensifying alloy is made of nitrogen, titanium, boron, silicon, manganese, carbon and rare earth；
In above-mentioned steps, the complex intensifying alloy is added in time after a quarter is added in the silicomangan.
Molten steel enters argon station, stirs 3 minutes or more under big argon atmosphere, the Composition Control of molten steel is existed: C be 0.22~
0.25wt%；Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；
In above-mentioned steps, after molten steel enters argon station, tapping early period and mid-term must be stirred argon gas greatly, and the later period is suitably reduced
Argon gas amount causes slag to prevent the tapping later period from not seeing.
Molten steel is poured and builds up continuous casting billet；
Continuous casting billet is heated, heating time controlled in 180 minutes, and soaking temperature is no more than 1200 DEG C；
By the continuous casting billet milling after heating at reinforcing bar；
Reinforcing bar is cooling in cooling water, water pressure of cooling water in 0.4MPa or more, cooling water ph value in 6.5-7.5, chlorine from
Sub- content is less than 100mg/L, and turbidity is less than 20NTU；
Cold bed on reinforcing bar after cooling is replied, wherein cold bed recovery temperature is in 820-900 on diameter 12-18mm reinforcing bar
DEG C, cold bed recovery temperature cold bed recovery temperature on 830-900 DEG C, diameter 28-40mm reinforcing bar exists on the reinforcing bar of diameter 20-25mm
840-900℃。
Reach 425-470MPa, strong flexor ratio (tensile strength/bend by reinforcement yielding intensity prepared by above-mentioned preparation method
Take intensity) reach 1.38 or more, metallographic structure is pearlite+ferritic structure, and reinforcing bar rolls rear non-corrosive, and surface quality is good,
It realizes and does not add the precious metals such as Nb, V；Use this preparation method opposite plus vanadium technique for ton steel reduce by 150 yuan of cost with
Upper (reducing by 0.02% or more vanadium in steel, reduce by 0.025% or more niobium in steel), relative to add for niobium technique ton steel reduce at
This 80 yuan or more.
Now example is embodied, the present invention is described in detail.
Embodiment 1
Shanxi steel mill (80 tons of converters) produce HRB400E grade of steel reinforcing bar, each specification reinforcing bar yield strength 425MPa with
On, strong flexor ratio is 1.40 or more, rebar surface non-corroding.Diameter is that the chemical component of the HRB400E grade of steel reinforcing bar of 12-28mm is shown in
Table 1.
Table 1
The preparation method of the HRB400E grade of steel reinforcing bar includes the following steps:
After the completion of smelting molten steel, 0.1-0.5kg/ tons of steel are added in molten steel contains aluminium deoxidizer；
Silicomangan is added in molten steel, and answering for 0.3-0.8kg/ tons of steel is added during silicomangan is added
Reinforced alloys are closed, the complex intensifying alloy is made of nitrogen, titanium, boron, silicon, manganese, carbon and rare earth；
Molten steel enters argon station, stirs 3 minutes or more under big argon atmosphere, the Composition Control of molten steel is existed: C be 0.22~
0.25wt%；Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；
Molten steel is poured and builds up continuous casting billet；
Continuous casting billet to be heated, heating time controlled in 180 minutes, and 980-1080 DEG C of soaking temperature；
By the continuous casting billet milling after heating at reinforcing bar；
Reinforcing bar is cooling in cooling water, and in 0.6MPa, cooling water ph value in 6.5-7.5, chloride ion contains water pressure of cooling water
Amount is less than 100mg/L, and turbidity is less than 20NTU；
Cold bed on reinforcing bar after cooling is replied, wherein cold bed recovery temperature is in 820-900 on diameter 12-18mm reinforcing bar
DEG C, cold bed recovery temperature cold bed recovery temperature on 835-900 DEG C, diameter 28-32mm reinforcing bar exists on the reinforcing bar of diameter 20-25mm
840-900℃。
The chemical component such as table 2 of the HRB400E grade of steel reinforcing bar of production, the steel bar mechanics performance testing result such as table 3.
Table 2
Table 3
Seen from table 3, mechanical property fully meets company standard, and opposite national standard surplus capacity is larger.Referring back to shown in Fig. 2,
As it can be seen that the metallographic structure of reinforcing bar is pearlite+ferritic structure, new standard (GB/T 1499.2-2018) requirement is complied fully with.
It is shown in Figure 3 again, it is seen that rebar surface quality fully meets company standard.
Embodiment 2
Anhui steel mill (75 tons of converters) produce HRB400E grade of steel reinforcing bar, each specification reinforcing bar yield strength 430MPa with
On, strong flexor ratio is 1.38 or more, rebar surface non-corroding.Diameter is that the chemical component of the HRB400E grade of steel reinforcing bar of 12-32mm is shown in
Table 4.
Table 4
The preparation method of the HRB400E grade of steel reinforcing bar includes the following steps:
After the completion of smelting molten steel, 0.1-0.5kg/ tons of steel are added in molten steel contains aluminium deoxidizer；
Silicomangan is added in molten steel, and answering for 0.3-0.8kg/ tons of steel is added during silicomangan is added
Reinforced alloys are closed, the complex intensifying alloy is made of nitrogen, titanium, boron, silicon, manganese, carbon and rare earth；
Molten steel enters argon station, stirs 3 minutes or more under big argon atmosphere, the Composition Control of molten steel is existed: C be 0.22~
0.25wt%；Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；
Molten steel is poured and builds up continuous casting billet；
Continuous casting billet to be heated, heating time controlled in 180 minutes, and 1000-1100 DEG C of soaking temperature；
By the continuous casting billet milling after heating at reinforcing bar；
Reinforcing bar is cooling in cooling water, and in 0.6MPa, cooling water ph value in 6.5-7.5, chloride ion contains water pressure of cooling water
Amount is less than 100mg/L, and turbidity is less than 20NTU；
Cold bed on reinforcing bar after cooling is replied, wherein cold bed recovery temperature is in 840-900 on diameter 12-25mm reinforcing bar
DEG C, cold bed recovery temperature is at 850-900 DEG C on diameter 28-40mm reinforcing bar.
The chemical component such as table 5 of the HRB400E grade of steel reinforcing bar of production, the steel bar mechanics performance testing result such as table 6.
Table 5
Table 6
By table 6 as it can be seen that mechanical property fully meets company standard, opposite national standard surplus capacity is larger.Referring back to shown in Fig. 4,
As it can be seen that the metallographic structure of reinforcing bar is pearlite+ferritic structure, new standard (GB/T 1499.2-2018) requirement is complied fully with,
Shown in Figure 5 again, rebar surface quality fully meets company standard.
The invention has the following beneficial effects:
1, technological operation is simple, does not change existing smelting and rolling equipment, reduces temperature on cooling table and promotes cold bed production
Ability, thus can suitably increase rolling mill yield, cost of alloy is greatly reduced, can be pushed away in the enterprise that any screw-thread steel produces
It is wide to use；
2, the comprehensive utilization for realizing low price resource, reduces the use of niobium, vanadium etc., promoted steel enterprise economic benefit,
Environmental pressure caused by reducing because of resources such as exploitation niobium, vanadium；
3, the production that spiral low cost can be achieved, greatly improves spiral production level, is that spiral is raw
The novel technique that the enterprise of production is worthy to be popularized can bring preferable economic benefit and social benefit.
Although the embodiments of the present invention have been disclosed as above, but it is not restricted to listed fortune in specification and embodiment
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily real
Now other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is not limited to
Specific details and the legend herein shown with description.
Claims (3)
1. a kind of spiral, which is characterized in that the chemical component of the spiral are as follows: C is 0.22~0.25wt%；Si is
0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；Remaining is Fe and can not
The impurity avoided.
2. a kind of preparation method of spiral, which comprises the steps of:
After the completion of smelting molten steel, 0.1-0.5kg/ tons of steel are added in molten steel contains aluminium deoxidizer；
Silicomangan is added in molten steel, and the compound strong of 0.3-0.8kg/ tons of steel is added during silicomangan is added
Alloy, the complex intensifying alloy are made of nitrogen, titanium, boron, silicon, manganese, carbon and rare earth；
Molten steel enters argon station, stirs 3 minutes or more under big argon atmosphere, the Composition Control of molten steel is existed: C be 0.22~
0.25wt%；Si is 0.5~0.75wt%；Mn is 1.35~1.55wt%；P is≤0.045wt%；S is≤0.045wt%；
Molten steel is poured and builds up continuous casting billet；
Continuous casting billet is heated, heating time controlled in 180 minutes, and soaking temperature is no more than 1200 DEG C；
By the continuous casting billet milling after heating at reinforcing bar；
Reinforcing bar is cooling in cooling water, and in 0.4MPa or more, cooling water ph value in 6.5-7.5, chloride ion contains water pressure of cooling water
Amount is less than 100mg/L, and turbidity is less than 20NTU；
Cold bed on reinforcing bar after cooling is replied, wherein cold bed recovery temperature is at 820-900 DEG C on diameter 12-18mm reinforcing bar, directly
On the reinforcing bar of diameter 20-25mm cold bed recovery temperature on 830-900 DEG C, diameter 28-40mm reinforcing bar cold bed recovery temperature in 840-
900℃。
3. a kind of preparation method of spiral according to claim 2, which is characterized in that after the completion of smelting molten steel,
If carbon content is lower than 0.05% in molten steel, 20% or more increase contains aluminium deoxidizer in molten steel.
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| CN201811620161.5A CN109628829A (en) | 2018-12-28 | 2018-12-28 | A kind of spiral and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913765A (en) * | 2019-04-29 | 2019-06-21 | 江苏省沙钢钢铁研究院有限公司 | 400MPa grades of reinforcing bars and its manufacturing method |
| CN110257719A (en) * | 2019-08-02 | 2019-09-20 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of micro-alloyed with Nb and Ti HRB400 grades of screw-thread steels and its manufacturing method |
| CN110373610A (en) * | 2019-08-23 | 2019-10-25 | 福建三宝钢铁有限公司 | A kind of fine grain reinforcing bar preparation method producing HRB400E |
| CN114959174A (en) * | 2022-06-07 | 2022-08-30 | 西峡县丰业冶金材料有限公司 | High-strength hot-rolled ribbed steel bar produced by utilizing rare earth elements and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1900325A (en) * | 2006-07-04 | 2007-01-24 | 水城钢铁（集团）有限责任公司 | Composite reinforced producing method for high strength steel |
| CN101275197A (en) * | 2007-07-19 | 2008-10-01 | 天津钢铁有限公司 | High-strength rebar and manufacturing process thereof |
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2018
- 2018-12-28 CN CN201811620161.5A patent/CN109628829A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1900325A (en) * | 2006-07-04 | 2007-01-24 | 水城钢铁（集团）有限责任公司 | Composite reinforced producing method for high strength steel |
| CN101275197A (en) * | 2007-07-19 | 2008-10-01 | 天津钢铁有限公司 | High-strength rebar and manufacturing process thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913765A (en) * | 2019-04-29 | 2019-06-21 | 江苏省沙钢钢铁研究院有限公司 | 400MPa grades of reinforcing bars and its manufacturing method |
| CN110257719A (en) * | 2019-08-02 | 2019-09-20 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of micro-alloyed with Nb and Ti HRB400 grades of screw-thread steels and its manufacturing method |
| CN110373610A (en) * | 2019-08-23 | 2019-10-25 | 福建三宝钢铁有限公司 | A kind of fine grain reinforcing bar preparation method producing HRB400E |
| CN114959174A (en) * | 2022-06-07 | 2022-08-30 | 西峡县丰业冶金材料有限公司 | High-strength hot-rolled ribbed steel bar produced by utilizing rare earth elements and production method thereof |
| CN114959174B (en) * | 2022-06-07 | 2024-01-12 | 西峡县丰业冶金材料有限公司 | High-strength hot rolled ribbed steel bar produced by rare earth element and production method thereof |
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Application publication date: 20190416 |