CN110029281A - A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof - Google Patents
A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof Download PDFInfo
- Publication number
- CN110029281A CN110029281A CN201910454530.6A CN201910454530A CN110029281A CN 110029281 A CN110029281 A CN 110029281A CN 201910454530 A CN201910454530 A CN 201910454530A CN 110029281 A CN110029281 A CN 110029281A
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- Prior art keywords
- reinforcing bar
- microalloying
- temperature
- fine grain
- preparation
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—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
- 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 kind of Nb-microalloying fine grain HRB400 reinforcing bars, chemical component including following mass percent: C 0.22~0.25%, Si 0.40~0.50%, Mn 1.35~1.45%, Nb 0.025~0.035%, surplus are Fe and inevitable impurity.Preparation method is also disclosed.Nb-microalloying fine grain HRB400 reinforcing bar provided by the invention not only increases the intensity of reinforcing bar, and reduces production cost.
Description
Technical field
The present invention relates to metallurgical technology field more particularly to a kind of Nb-microalloying fine grain HRB400 reinforcing bar and its preparations
Method.
Background technique
HRB400 is the spiral trade mark specified in " concrete reinforcement steel " GB 1499.2-2018, because standard at
Divide production equipment, technology controlling and process of wider range and manufacturer etc. different, each producer HRB400 produced is hot-rolled ribbed
The ingredient of reinforcing bar is different, while each steel mill's production technology is also different.The mechanical strength of existing HRB400 reinforcing bar
Bad, performance is unstable, in order to improve the intensity of reinforcing bar, reduces production cost, raw using Nb-microalloying cooperation cooling control after rolling
Produce HRB400 reinforcing bar.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of Nb-microalloying fine grain HRB400 reinforcing bars
And preparation method thereof.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of Nb-microalloying fine grain HRB400 reinforcing bar of the present invention, the chemical component including following mass percent: C
0.22~0.25%, Si 0.40~0.50%, Mn 1.35~1.45%, Nb 0.025~0.035%, surplus are Fe and can not
The impurity avoided.
Further, P≤0.045% in the impurity, S≤0.045% in the impurity.
Further, the chemical component including following mass percent: C 0.23%, Si 0.47%, Mn 1.40%, Nb
0.02%, P 0.012%, S 0.011%, surplus are Fe and inevitable impurity.
Further, the chemical component including following mass percent: C 0.25%, Si 0.45%, Mn 1.43%, Nb
0.02%, P 0.030%, S 0.022%, surplus are Fe and inevitable impurity.
A kind of preparation method of Nb-microalloying fine grain HRB400 reinforcing bar, comprising:
It smelts, C content is no less than 0.06wt% in converter terminal molten steel, and P content is no more than 0.03wt%；Tapping temperature is
1620~1644 DEG C；
Refining；
Continuous casting, the degree of superheat are set as 25~35 DEG C, and pulling rate is 2.2~2.4m/min；
Rolling, start rolling temperature are 970~1000 DEG C, and entry temperature at finishing is 940~960 DEG C.
Further, in the smelting process, be added one of ferrosilicon, silicomanganese, anthracite and aluminium silicon titanium or it is a variety of into
Row deoxidation alloying；Tapping process carries out BOTTOM ARGON BLOWING operation to ladle.
Further, in the refining process, ferrosilicon, mid-carbon fe-mn is added and is calcined one or more progress in anthracite
Trimming；Refine later period addition niobium alloy；The soft blow time is greater than 10min
Further, in the operation of rolling, cooling control after rolling water tank opens a water pump 1350 turns/min, Φ 28mm reinforcing bar
Control cold water storage cistern temperature is 830~840 DEG C out；Φ 25mm reinforcing bar goes out to control 825~835 DEG C of cold water storage cistern temperature；Φ 20mm reinforcing bar goes out to control
820~830 DEG C of cold water storage cistern temperature；Φ 18mm reinforcing bar goes out to control 815~825 DEG C of cold water storage cistern temperature.
Compared with prior art, advantageous effects of the invention:
By improving intensity using Nb-microalloying, achieve the purpose that reduce cost compared to using vanadium iron microalloying.
HRB400 reinforcing bar provided by the invention is stablized with excellent in mechanical performance simultaneously, advantage at low cost.
Specific embodiment
THE INDUSTRIAL TRIAL 10 furnace steel, specific process parameter control are as follows:
1, converter smelting
5000~6000kg of lime, 3000~4000kg of dolomite, iron sheet ball is added according to composition requirements when converter smelting
Ferrosilicon 500kg, silicomanganese 2800kg are added in tapping process by 1000~3000kg.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as shown in table 1.
The ingredient and temperature of 1 converter tapping of table
| Tapping temperature, DEG C | Tapping carbon content, wt% | Tapping phosphorus content, wt% | |
| Embodiment 1 | 1620 | 0.06 | 0.011 |
| Embodiment 2 | 1644 | 0.15 | 0.030 |
| Embodiment 3 | 1633 | 0.11 | 0.020 |
| Embodiment 4 | 1625 | 0.07 | 0.015 |
| Embodiment 5 | 1640 | 0.13 | 0.022 |
| Embodiment 6 | 1628 | 0.09 | 0.019 |
| Embodiment 7 | 1642 | 0.14 | 0.025 |
| Embodiment 8 | 1630 | 0.10 | 0.20 |
| Embodiment 9 | 1622 | 0.06 | 0.013 |
| Embodiment 10 | 1633 | 0.12 | 0.020 |
2, LF furnace refines
It carries out adding auxiliary material slag making according to molten steel composition and temperature change, adduction gold is finely adjusted and warming temperature.Lime is added
500~600kg, 200~300kg of bauxite, alloy are finely adjusted addition 50~80kg of manganese iron, ferrosilicon according to ingredient in place is refined
100~300kg, niobium alloy 65kg feed silicon-calcium wire, 200~300m of feed quantity after refining.
3, continuous casting
Technological parameter is listed in table 2；Product composition is listed in table 3.
2 casting parameters of table
3 finished product ingredient of table (wt%, surplus are iron)
| C | Si | Mn | Nb | P | S | |
| Embodiment 1 | 0.23 | 0.47 | 1.40 | 0.02 | 0.012 | 0.011 |
| Embodiment 2 | 0.25 | 0.45 | 1.43 | 0.02 | 0.030 | 0.022 |
| Embodiment 3 | 0.23 | 0.41 | 1.44 | 0.025 | 0.024 | 0.018 |
| Embodiment 4 | 0.22 | 0.48 | 1.42 | 0.025 | 0.014 | 0.018 |
| Embodiment 5 | 0.24 | 0.43 | 1.40 | 0.025 | 0.020 | 0.021 |
| Embodiment 6 | 0.23 | 0.49 | 1.41 | 0.025 | 0.018 | 0.020 |
| Embodiment 7 | 0.23 | 0.41 | 1.42 | 0.025 | 0.013 | 0.015 |
| Embodiment 8 | 0.24 | 0.40 | 1.39 | 0.025 | 0.026 | 0.021 |
| Embodiment 9 | 0.22 | 0.42 | 1.41 | 0.025 | 0.014 | 0.016 |
| Embodiment 10 | 0.24 | 0.41 | 1.40 | 0.02 | 0.024 | 0.018 |
4, Rolling production
Production size is respectively the reinforcing bar of Φ 28mm, Φ 25mm, Φ 20mm, Φ 18mm；Start rolling temperature is 970~1000
DEG C, entry temperature at finishing is 940~960 DEG C.Cooling control after rolling water tank opens a water pump 1350 turns/min, Φ 28mm reinforcing bar and goes out to control
Cold water storage cistern temperature is 830~840 DEG C；Φ 25mm reinforcing bar goes out to control 825~835 DEG C of cold water storage cistern temperature；Φ 20mm reinforcing bar goes out to control cold water
820~830 DEG C of box temperature degree；Φ 18mm reinforcing bar goes out to control 815~825 DEG C of cold water storage cistern temperature.
4 rolling technological parameter of table
Mechanics Performance Testing is carried out to the reinforcing bar of above-mentioned ten embodiment preparations, test result is listed in table 5:
5 Mechanics Performance Testing of table
As shown in Table 5, HRB400 reinforcing bar indices produced by the invention are all satisfied standard requirements, can satisfy user's
Use demand.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (8)
1. a kind of Nb-microalloying fine grain HRB400 reinforcing bar, which is characterized in that the chemical component including following mass percent:
C 0.22~0.25%, Si 0.40~0.50%, Mn 1.35~1.45%, Nb 0.025~0.035%, surplus is for Fe and not
Evitable impurity.
2. Nb-microalloying fine grain HRB400 reinforcing bar according to claim 1, which is characterized in that the P in the impurity
≤ 0.045%, S≤0.045% in the impurity.
3. Nb-microalloying fine grain HRB400 reinforcing bar according to claim 1, which is characterized in that including following quality hundred
Divide the chemical component of ratio: C 0.23%, Si 0.47%, Mn 1.40%, Nb 0.02%, P 0.012%, S 0.011%, it is remaining
Amount is Fe and inevitable impurity.
4. Nb-microalloying fine grain HRB400 reinforcing bar according to claim 1, which is characterized in that including following quality hundred
Divide the chemical component of ratio: C 0.25%, Si 0.45%, Mn 1.43%, Nb 0.02%, P 0.030%, S 0.022%, it is remaining
Amount is Fe and inevitable impurity.
5. a kind of preparation method of Nb-microalloying fine grain HRB400 reinforcing bar characterized by comprising
It smelts, C content is no less than 0.06wt% in converter terminal molten steel, and P content is no more than 0.03wt%；Tapping temperature is 1620
~1644 DEG C；
Refining；
Continuous casting, the degree of superheat are set as 25~35 DEG C, and pulling rate is 2.2~2.4m/min；
Rolling, start rolling temperature are 970~1000 DEG C, and entry temperature at finishing is 940~960 DEG C.
6. preparation method according to claim 5, which is characterized in that in the smelting process, ferrosilicon, silicomanganese, nothing is added
One of bituminous coal and aluminium silicon titanium or a variety of carry out deoxidation alloyings；Tapping process carries out BOTTOM ARGON BLOWING operation to ladle.
7. preparation method according to claim 5, which is characterized in that in the refining process, ferrosilicon, mid-carbon fe-mn is added
With one or more carry out trimmings in calcination anthracite；Refine later period addition niobium alloy；The soft blow time is greater than 10min.
8. preparation method according to claim 5, which is characterized in that in the operation of rolling, cooling control after rolling water tank is opened
It is 830~840 DEG C that one water pump 1350 turns/min, Φ 28mm reinforcing bar, which goes out to control cold water storage cistern temperature,；Φ 25mm reinforcing bar goes out to control cold water storage cistern
825~835 DEG C of temperature；Φ 20mm reinforcing bar goes out to control 820~830 DEG C of cold water storage cistern temperature；Φ 18mm reinforcing bar goes out to control cold water storage cistern temperature 815
~825 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684931A (en) * | 2019-10-24 | 2020-01-14 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110819907A (en) * | 2019-10-24 | 2020-02-21 | 柳州钢铁股份有限公司 | Niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110952021A (en) * | 2019-10-17 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof |
| CN111041354A (en) * | 2019-12-04 | 2020-04-21 | 包头钢铁（集团）有限责任公司 | Titanium microalloyed HRB400E anti-seismic steel bar and preparation method thereof |
| CN111187969A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Production method of 400 MPa-level niobium-nitrogen microalloyed twisted steel |
| CN111485088A (en) * | 2020-03-13 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Control method for solving problem of unobvious yield strength of niobium microalloyed HRB400E steel bar |
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| CN101302599A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | Niobium microalloyed high strength hot work die steel and preparation thereof |
| CN108950135A (en) * | 2018-09-03 | 2018-12-07 | 包头钢铁（集团）有限责任公司 | The production method of HRB400 reinforcing bar and HRB400 reinforcing bar |
| CN109023041A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN109355565A (en) * | 2018-11-16 | 2019-02-19 | 通化钢铁股份有限公司 | A kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method |
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Patent Citations (4)
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| CN101302599A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | Niobium microalloyed high strength hot work die steel and preparation thereof |
| CN109023041A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110952021A (en) * | 2019-10-17 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof |
| CN110684931A (en) * | 2019-10-24 | 2020-01-14 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110819907A (en) * | 2019-10-24 | 2020-02-21 | 柳州钢铁股份有限公司 | Niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110684931B (en) * | 2019-10-24 | 2020-11-27 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110819907B (en) * | 2019-10-24 | 2020-11-27 | 柳州钢铁股份有限公司 | Niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN111041354A (en) * | 2019-12-04 | 2020-04-21 | 包头钢铁（集团）有限责任公司 | Titanium microalloyed HRB400E anti-seismic steel bar and preparation method thereof |
| CN111187969A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Production method of 400 MPa-level niobium-nitrogen microalloyed twisted steel |
| CN111485088A (en) * | 2020-03-13 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Control method for solving problem of unobvious yield strength of niobium microalloyed HRB400E steel bar |
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