CN110952021A - Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof - Google Patents

Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof Download PDF

Info

Publication number
CN110952021A
CN110952021A CN201910990264.9A CN201910990264A CN110952021A CN 110952021 A CN110952021 A CN 110952021A CN 201910990264 A CN201910990264 A CN 201910990264A CN 110952021 A CN110952021 A CN 110952021A
Authority
CN
China
Prior art keywords
steel bar
vanadium
percent
temperature
nitrogen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910990264.9A
Other languages
Chinese (zh)
Inventor
吕刚
涛雅
赵晓敏
姜德刚
白月琴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baotou Iron and Steel Group Co Ltd
Original Assignee
Baotou Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baotou Iron and Steel Group Co Ltd filed Critical Baotou Iron and Steel Group Co Ltd
Priority to CN201910990264.9A priority Critical patent/CN110952021A/en
Publication of CN110952021A publication Critical patent/CN110952021A/en
Pending legal-status Critical Current

Links

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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • 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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Abstract

The invention discloses a vanadium-nitrogen microalloyed HRB500E steel bar, which comprises the following chemical components in percentage by mass: 0.22 to 0.25 percent of C, 0.45 to 0.55 percent of Si, 1.40 to 1.50 percent of Mn, 0.07 to 0.09 percent of V, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S, and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The vanadium-nitrogen microalloyed HRB500E steel bar has the advantages that the strength is improved by vanadium-nitrogen microalloying, the cost is reduced compared with the vanadium-iron microalloying, and the mechanical property is excellent and stable.

Description

Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof
Technical Field
The invention relates to the technical field of metallurgy, in particular to a vanadium-nitrogen microalloyed HRB500E steel bar and a production method thereof.
Background
HRB500E is a twisted steel bar mark specified in 'Steel for reinforced concrete' GB 1499.2-2018, and due to the wide range of standard components and the difference of production equipment and process control of manufacturers, the HRB500E hot-rolled ribbed steel bars produced by each manufacturer have different components and the production process of each steel manufacturer is also different. The existing HRB500E steel bar has poor mechanical strength and unstable performance, and the technical problem of how to improve the strength of the steel bar and reduce the production cost is urgently needed to be solved.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a vanadium-nitrogen microalloyed HRB500E steel bar and a production method thereof, wherein the vanadium-nitrogen microalloyed HRB500E steel bar is produced by controlled cooling after being matched with rolling.
In order to solve the technical problems, the invention adopts the following technical scheme:
a vanadium-nitrogen microalloyed HRB500E steel bar comprises the following chemical components in percentage by mass: 0.22 to 0.25 percent of C, 0.45 to 0.55 percent of Si, 1.40 to 1.50 percent of Mn, 0.07 to 0.09 percent of V, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S, and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: 0.23% of C, 0.47% of Si, 1.42% of Mn, 0.07% of V, 0.012% of P, 0.011% of S, and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: 0.22% of C, 0.48% of Si, 1.42% of Mn, 0.075% of V, 0.014% of P, 0.018% of S and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: 0.23% of C, 0.49% of Si, 1.41% of Mn, 0.075% of V, 0.018% of P, 0.020% of S and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: 0.24% of C, 0.51% of Si, 1.42% of Mn, 0.08% of V, 0.024% of P, 0.018% of S, and the balance of Fe and inevitable impurities.
A method for producing vanadium-nitrogen microalloyed HRB500E steel bars comprises the following steps: smelting: the C content in the molten steel at the converter end point is not less than 0.06 wt%, and the P content is not more than 0.03 wt%; the tapping temperature is 1620-1644 ℃; refining; continuous casting: the superheat degree is set to be 25-35 ℃, and the pulling speed is 2.2-2.4 m/min; rolling: the initial rolling temperature is 970-.
Further, in the smelting process, one or more of ferrosilicon, silicomanganese, anthracite and aluminum-silicon-titanium are added for deoxidation alloying; and carrying out bottom argon blowing operation on the ladle in the tapping process.
Further, in the refining process, one or more of ferrosilicon, medium carbon ferromanganese and calcined anthracite is added for fine adjustment of components; adding vanadium-nitrogen alloy in the later stage of refining; the soft blowing time is more than 10 min.
Further, in the rolling process, after rolling, the cold water control tank starts a water pump 1350 revolutions/min, and the temperature of the steel bar with the diameter of 28mm out of the cold water control tank is 830-840 ℃; the temperature of the reinforcing steel bar with the diameter of 25mm out of the controlled cooling water tank is 825 ℃ and 835 ℃; the temperature of reinforcing steel bars with the diameter of phi 20mm after being taken out of the controlled cooling water tank is 820 and 830 ℃; the temperature of the reinforcing steel bar with the diameter of 18mm is 815-.
Compared with the prior art, the invention has the beneficial technical effects that:
the strength is improved by utilizing vanadium-nitrogen microalloying, compared with the method adopting ferrovanadium microalloying, the method achieves the purpose of reducing the cost, and meanwhile, the mechanical property is excellent and stable.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
According to the embodiment of the invention, the HRB400 steel bar comprises the following chemical components in percentage by mass: 0.22 to 0.25 percent of C, 0.45 to 0.55 percent of Si, 1.40 to 1.50 percent of Mn, 0.07 to 0.09 percent of V, and the balance of Fe and inevitable impurities.
Wherein: p in the impurities is less than or equal to 0.045%, and S in the impurities is less than or equal to 0.045%.
The production method comprises the following steps: smelting, wherein the C content in the molten steel at the end point of the converter is not less than 0.06 wt%, and the P content is not more than 0.03 wt%; the tapping temperature is 1620-1644 ℃; refining; continuous casting, wherein the superheat degree is set to be 25-35 ℃, and the drawing speed is 2.2-2.4 m/min; rolling, wherein the initial rolling temperature is 970-.
Wherein: in the smelting process, one or more of ferrosilicon, silicomanganese, anthracite and aluminum-silicon-titanium are added for deoxidation alloying; and carrying out bottom argon blowing operation on the ladle in the tapping process. In the refining process, one or more of ferrosilicon, medium carbon ferromanganese and calcined anthracite are added for fine adjustment of components; adding vanadium-nitrogen alloy in the later stage of refining; the soft blowing time is more than 10 min. In the rolling process, a water pump is started for 1350 revolutions per minute in the controlled cooling water tank after rolling, and the temperature of the reinforcing steel bar with the diameter of 28mm out of the controlled cooling water tank is 830-840 ℃; the temperature of the reinforcing steel bar with the diameter of 25mm out of the controlled cooling water tank is 825 ℃ and 835 ℃; the temperature of reinforcing steel bars with the diameter of phi 20mm after being taken out of the controlled cooling water tank is 820 and 830 ℃; the temperature of the reinforcing steel bar with the diameter of 18mm is 815-.
In addition: the temperature of the reinforcing steel bar with the diameter of phi 28mm after being taken out of the controlled cooling water tank is 830-840 ℃, and the temperature is more preferably 835 ℃; after rolling, the cold water tank is controlled to start a water pump for 1350 revolutions/min; the temperature of the reinforcing steel bar with the diameter of phi 25mm taken out of the cold water control tank is 825-835 ℃, and the more preferable temperature is 830 ℃; after rolling, the cold water tank is controlled to start a water pump for 1350 revolutions/min; the temperature of the reinforcing steel bar with the diameter of phi 20mm taken out of the cold water control tank is 820-830 ℃, and the temperature is more preferably 825 ℃; after rolling, the cold water tank is controlled to start a water pump for 1350 revolutions/min; the temperature of the reinforcing steel bar with the diameter of 18mm taken out of the cold water control tank is 815-825 ℃, and the more preferable temperature is 820 ℃; after rolling, the cold water tank is controlled to start a water pump for 1350 revolutions/min.
10 furnaces of steel are produced in an industrial trial mode, and the specific technological parameters are controlled as follows:
1. smelting in a converter
When smelting in a converter, 5000-6000kg of lime, 3000-4000kg of dolomite and 3000-3000 kg of iron scale balls are added according to component requirements, and 500kg of ferrosilicon and 2800kg of silicomanganese are added in the tapping process.
The carbon content, phosphorus content (mass percent) and tapping temperature of the molten steel at the end of the converter are shown in Table 1.
TABLE 1 composition and temperature of converter tapping
Tapping temperature, DEG C Carbon content of steel tapping, wt% Phosphorus content of tapping, wt%
Example 1 1620 0.06 0.011
Example 2 1644 0.15 0.030
Example 3 1633 0.11 0.020
Example 4 1625 0.07 0.015
Example 5 1640 0.13 0.022
Example 6 1628 0.09 0.019
Example 7 1642 0.14 0.025
Example 8 1630 0.10 0.20
Example 9 1622 0.06 0.013
Example 10 1633 0.12 0.020
2. Refining in LF furnace
Adding auxiliary materials for slagging according to the components and temperature change of the molten steel, and adding alloy for fine adjustment and heating operation. Adding 500-600kg of lime, 200-300kg of bauxite, finely adjusting the alloy according to the in-place components of refining, adding 50-80kg of ferromanganese, 100-300kg of ferrosilicon and 200kg of vanadium-nitrogen alloy, feeding a calcium-silicon wire after refining, and feeding the calcium-silicon wire with the feeding amount of 200-300 m.
3. Continuous casting production
The process parameters are listed in Table 2; the product ingredients are listed in table 3.
TABLE 2 continuous casting Process parameters
Degree of superheat (. degree. C.) Pulling speed (m/min)
Example 1 27 2.2
Example 2 34 2.6
Example 3 30 2.3
Example 4 28 2.3
Example 5 29 2.4
Example 6 33 2.6
Example 7 28 2.2
Example 8 32 2.6
Example 9 32 2.6
Example 10 30 2.4
TABLE 3 Final product composition (wt%, balance iron)
Figure BDA0002238038020000051
4. Production of steel rolling
Producing steel bars with the sizes of phi 28mm, phi 25mm, phi 20mm and phi 18mm respectively; the initial rolling temperature is 970-. Starting a water pump for 1350 revolutions per minute in the controlled cooling water tank after rolling, wherein the temperature of reinforcing steel bars with the diameter of 28mm out of the controlled cooling water tank is 830-840 ℃; the temperature of the reinforcing steel bar with the diameter of 25mm out of the controlled cooling water tank is 825 ℃ and 835 ℃; the temperature of reinforcing steel bars with the diameter of phi 20mm after being taken out of the controlled cooling water tank is 820 and 830 ℃; the temperature of the reinforcing steel bar with the diameter of 18mm is 815-.
TABLE 4 Rolling Process parameters
Figure BDA0002238038020000061
The mechanical properties of the reinforcing steel bars prepared in the above ten examples were tested, and the test results are shown in table 5:
TABLE 5 mechanical Properties test
Figure BDA0002238038020000062
Figure BDA0002238038020000071
As can be seen from Table 5, the HRB500E steel bar produced by the method has good mechanical properties, and all indexes meet the standard requirements, so that the use requirements of users can be met.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (9)

1. A vanadium-nitrogen microalloyed HRB500E steel bar is characterized by comprising the following chemical components in percentage by mass: 0.22 to 0.25 percent of C, 0.45 to 0.55 percent of Si, 1.40 to 1.50 percent of Mn, 0.07 to 0.09 percent of V, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S, and the balance of Fe and inevitable impurities.
2. The vanadium-nitrogen microalloyed HRB500E steel bar as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: 0.23% of C, 0.47% of Si, 1.42% of Mn, 0.07% of V, 0.012% of P, 0.011% of S, and the balance of Fe and inevitable impurities.
3. The vanadium-nitrogen microalloyed HRB500E steel bar as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: 0.22% of C, 0.48% of Si, 1.42% of Mn, 0.075% of V, 0.014% of P, 0.018% of S and the balance of Fe and inevitable impurities.
4. The vanadium-nitrogen microalloyed HRB500E steel bar as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: 0.23% of C, 0.49% of Si, 1.41% of Mn, 0.075% of V, 0.018% of P, 0.020% of S and the balance of Fe and inevitable impurities.
5. The vanadium-nitrogen microalloyed HRB500E steel bar as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: 0.24% of C, 0.51% of Si, 1.42% of Mn, 0.08% of V, 0.024% of P, 0.018% of S, and the balance of Fe and inevitable impurities.
6. A method for producing a vanadium-nitrogen microalloyed HRB500E steel bar as claimed in any one of claims 1 to 5, which comprises the following steps: smelting: the C content in the molten steel at the converter end point is not less than 0.06 wt%, and the P content is not more than 0.03 wt%; the tapping temperature is 1620-1644 ℃; refining; continuous casting: the superheat degree is set to be 25-35 ℃, and the pulling speed is 2.2-2.4 m/min; rolling: the initial rolling temperature is 970-.
7. The production method according to claim 6, wherein one or more of ferrosilicon, silicomanganese, anthracite and aluminum-silicon-titanium are added for deoxidation alloying in the smelting process; and carrying out bottom argon blowing operation on the ladle in the tapping process.
8. The production method according to claim 6, wherein during the refining, one or more of ferrosilicon, medium carbon ferromanganese and calcined anthracite is added for fine adjustment of the components; adding vanadium-nitrogen alloy in the later stage of refining; the soft blowing time is more than 10 min.
9. The production method as claimed in claim 6, wherein in the rolling process, one water pump 1350 rpm is started in the controlled cooling water tank after rolling, and the temperature of the steel bar with the diameter of 28mm out of the controlled cooling water tank is 830-840 ℃; the temperature of the reinforcing steel bar with the diameter of 25mm out of the controlled cooling water tank is 825 ℃ and 835 ℃; the temperature of reinforcing steel bars with the diameter of phi 20mm after being taken out of the controlled cooling water tank is 820 and 830 ℃; the temperature of the reinforcing steel bar with the diameter of 18mm is 815-.
CN201910990264.9A 2019-10-17 2019-10-17 Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof Pending CN110952021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910990264.9A CN110952021A (en) 2019-10-17 2019-10-17 Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910990264.9A CN110952021A (en) 2019-10-17 2019-10-17 Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof

Publications (1)

Publication Number Publication Date
CN110952021A true CN110952021A (en) 2020-04-03

Family

ID=69975604

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910990264.9A Pending CN110952021A (en) 2019-10-17 2019-10-17 Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof

Country Status (1)

Country Link
CN (1) CN110952021A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113957325A (en) * 2021-09-06 2022-01-21 包头钢铁（集团）有限责任公司 Method for solving brittle failure of construction steel bar
CN115341133A (en) * 2022-08-22 2022-11-15 包头钢铁（集团）有限责任公司 Production method of high-strength construction steel bar

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104745968A (en) * 2014-12-24 2015-07-01 福建三宝特钢有限公司 HRB500E seismic steel bar and preparation method thereof
CN105483544A (en) * 2015-12-21 2016-04-13 马鞍山钢铁股份有限公司 500MPa anti-seismic coiled thread steel and processing method thereof
CN108149141A (en) * 2018-01-17 2018-06-12 福建三宝钢铁有限公司 A kind of midium-carbon steel Ф 50HRB500E anti-seismic steel bars and preparation method thereof
CN110029281A (en) * 2019-05-29 2019-07-19 包头钢铁（集团）有限责任公司 A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104745968A (en) * 2014-12-24 2015-07-01 福建三宝特钢有限公司 HRB500E seismic steel bar and preparation method thereof
CN105483544A (en) * 2015-12-21 2016-04-13 马鞍山钢铁股份有限公司 500MPa anti-seismic coiled thread steel and processing method thereof
CN108149141A (en) * 2018-01-17 2018-06-12 福建三宝钢铁有限公司 A kind of midium-carbon steel Ф 50HRB500E anti-seismic steel bars and preparation method thereof
CN110029281A (en) * 2019-05-29 2019-07-19 包头钢铁（集团）有限责任公司 A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113957325A (en) * 2021-09-06 2022-01-21 包头钢铁（集团）有限责任公司 Method for solving brittle failure of construction steel bar
CN115341133A (en) * 2022-08-22 2022-11-15 包头钢铁（集团）有限责任公司 Production method of high-strength construction steel bar

Similar Documents

Publication Publication Date Title
CN103160729B (en) Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof
CN105400927A (en) Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology
CN102776442B (en) Hot rolled steel used for stirrer in automotive stirring tank and production method thereof
CN102383042A (en) Microalloy HRB400E steel bar containing chrome and nitrogen and production method thereof
CN111041354A (en) Titanium microalloyed HRB400E anti-seismic steel bar and preparation method thereof
CN110029281A (en) A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof
CN108950135A (en) The production method of HRB400 reinforcing bar and HRB400 reinforcing bar
CN103205628A (en) Production method of HRB400 (Rockwell Hardness) deformed steel bar
CN113943893A (en) Production method of 700 MPa-grade rare earth-containing welding wire steel
CN110952021A (en) Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof
CN111826497A (en) Microalloy nitrogen increasing agent and application thereof
CN105331895A (en) Chromium-containing tire cord steel and preparation method thereof
CN103667587B (en) The smelting process of austenite steel for engine air valve
CN111893382B (en) Food chain stainless steel and preparation method thereof
CN103643115B (en) Low yield strength ratio steel of boracic and preparation method thereof
CN116121631A (en) Production method of large-specification niobium microalloyed rolled controlled-cooling HRB400E steel bar
CN110284046B (en) Preparation process of low-density steel for automobile
CN104263876A (en) Nitrogen-increasing manganese-increasing method for high-strength steel production
CN111593251A (en) Deformed steel bar and preparation method thereof
CN111485088A (en) Control method for solving problem of unobvious yield strength of niobium microalloyed HRB400E steel bar
CN111041368A (en) High-performance 82B wire rod steel and production method thereof
CN105441631A (en) Multielement nitralloy cored wire, application of multielement nitralloy cored wire, and production method of HRB500E high-strength aseismic steel
CN102732791A (en) Production method of cold-rolled dual phase steel with tensile strength of 450MPa
CN113122779B (en) Fine-grain normalizing-free tool steel and production method thereof
CN113913674B (en) Production method of hot rolled steel strip Q355B for economic welded pipe

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20200403