CN110373610A - A kind of fine grain reinforcing bar preparation method producing HRB400E - Google Patents
A kind of fine grain reinforcing bar preparation method producing HRB400E Download PDFInfo
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- CN110373610A CN110373610A CN201910786403.6A CN201910786403A CN110373610A CN 110373610 A CN110373610 A CN 110373610A CN 201910786403 A CN201910786403 A CN 201910786403A CN 110373610 A CN110373610 A CN 110373610A
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- 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C22C38/002—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to technical field of metallurgical manufacturing, and in particular to a kind of fine grain reinforcing bar preparation method for producing HRB400E.The following steps are included: (1) electric furnace smelting: charging slag making, is slagged tap, melting bath stirring, dephosphorization and desulfurization, and molten steel is obtained；(2) external refining: obtained molten steel is refined；(3) vacuum outgas: vacuum suction pours to obtain steel ingot；(4) forge: program heats (5) heat treatment: to after forging forging progressive hardening and tempering, and once annealed before quenching or normalized treatment.Product yield strength, the tensile strength that the present invention obtains are higher, and satisfactory mechanical property, elongation is higher, and anti seismic efficiency is more preferable.And preparation method of the present invention is easy to industrialize, cost is relatively low, there is better application prospect.
Description
Technical field
The present invention relates to technical field of metallurgical manufacturing, and in particular to a kind of fine grain reinforcing bar preparation method for producing HRB400E.
Background technique
The annual concrete for construction engineering scale of construction in China is huge, consumes a large amount of steel.Except a small amount of compressor wire steel twists
Other than line, the overwhelming majority is used in the reinforcing bar in concrete.The trade mark of China's hot rolled ribbed bars have HRB335, HRB400 and
HRB500 tri-, H, R, B respectively indicate hot rolling (Hot rolled), (Ribbled) with ribbing, reinforcing bar (bars), 335,400 and
500 respectively indicate the minimum yield strength of reinforcing bar, unit MPa.The rank of reinforcing bar is higher, and quality is better, either intensity, tough
Property and extension property all enhance therewith, promote high strength cast iron and undoubtedly more advantageously reduce the dosage of reinforcing bar.In recent years, with city
The continuous development and social progress of city's construction, it is low that common hot rolled ribbed bars HRB335 has gradually manifested its yield strength
Weakness not only drops the bearing capacity of building from great in the building such as high-rise building, elevated overpass, road, bridges and culverts
It is low, it is many even to be difficult to meet the requirements in special circumstances, and a large amount of steel will be caused to waste, building cost increases.Mesh
The preceding common hot rolled ribbed bars HRB335 of developed countries is almost eliminated, it is common to use 400MPa, 500MPa's is hot-rolled ribbed
Reinforcing bar.Large-scale popularization uses HRB400 reinforcing bar for domestic many places, especially Beijing-Tianjin Shanghai, East China, Central China.
Shockproof requirements are proposed to reinforcing bar again according to existing national standard, therefore have HRB400E, HRB500E high-strength anti-seismic screw thread again
Reinforcing bar.
With the further sternness of steel situation, " cost efficiency, control lose make up deficits, Resource regeneration, transition and upgrade " etc. thinkings
Have become the main guiding theory in each iron and steel enterprise's reply steel severe winter.Currently, producing HRB400E high-strength anti-seismic steel in industry
Muscle mostly uses microalloying, hot rolling technology, and the steel cost of alloy of technique production is higher, is unfavorable for enterprise and realizes this increasing of drop
Effect.
In addition to this, there is problems at present: start rolling temperature need to reach 1070 DEG C or more, conventional heating stove heating energy
Power is insufficient, in order to promote furnace temperature, needs sufficiently to heat, unavoidably reduces speed of production, only this influence will result in production
Efficiency reduces 20-30%, while it is larger also to will cause power consumption, coal consumption index, for example, ton steel blast furnace gas consumption will be made to exist
500m3Rolling cost is improved in left and right；Existing formula realizes complex intensifying using the elements such as Nb, Cu, V, strong flexor ratio and performance it is steady
Qualitative not strong, even some strong flexor ratios are close to national standard lower limit, and appearance surrender is unobvious once in a while during test, and part is advised
Lattice qualification rate reduces.
Patent of invention CN 109554613A discloses a kind of production method of HRB500E high-strength anti-seismic steel bar, including with
Lower step: production steel billet, component are as follows: C:0.20-0.25%, Si:0.40-0.70%, Mn:1.30-1.60%, P≤
0.045%, S≤0.045%, V:0.020-0.050%, N:0.0050-0.0120%, remaining for Fe and inevitably it is impure
Object；The component and the component formula of production HRB400, HRB400E are essentially identical, realize steel multistage: i.e. same chemical component
Formula, by adjusting rolling mill practice, may be implemented that HRB500E can be produced, can also produce HRB400E.Thus it can prepare original
Using unified production technology when expecting, preparing blank, production efficiency is favorably improved, and it is for example warm to reduce adjustment preparation parameter
The frequency of degree, component ratio, improves the stability of product, and is conducive to improve production efficiency.But it is computed, production cost
It is higher, it consumes energy higher.
Patent of invention CN 101920271A discloses a kind of air-cooled production technology of controlled rolling of HRB400 reinforcing bar, and feature exists
In: the continuous casting billet of 150 × 150 × 6000mm or 165 × 165 × 6000mm rolls after three sections of continuous pusher-type furnace heating
System, start rolling temperature are controlled at 1050-1150 DEG C, are pricked temperature control eventually at 930~970 DEG C, are rolled into the hot rolling of φ 10- φ 32mm
Three sections of water coolers are arranged in Ribbed Bar after finish to gauge, and the temperature after final water cooling is 680~760 DEG C, by cooling → re-heat →
Cooling → re-heat → cooling makes steel to adjust the cooling rate of various specifications hot rolled ribbed bars to obtain required sorbite
Rigidity of soft tissues toughening；Under the premise of guaranteeing the comprehensive mechanical property of reinforcing bar the dosage of major alloy can be significantly reduced, substantially in the present invention
Degree reduces production cost.But its mechanical strength only just reaches national standard, for industrial application special dimension also far from
It is enough.
Currently, a kind of low cost produces the fine grain reinforcing bar preparation method of HRB400E not yet, and obtained product is with good
Good mechanical strength and elongation.
Summary of the invention
In order to solve problem described above in the prior art, the present invention provides a kind of fine grain reinforcing bar for producing HRB 400E
Preparation method, which comprises the following steps:
(1) electric furnace smelting: charging slag making, is slagged tap, melting bath stirring, and molten steel is obtained；
(2) external refining: obtained molten steel is refined；
(3) vacuum outgas: vacuum suction pours to obtain steel ingot；
(4) it forges: program heating, 600-650 DEG C of preheating section, 1000-1100 DEG C of bringing-up section, soaking zone 1100-1200
DEG C, 950-1050 DEG C of start rolling temperature, 900-950 DEG C of temperature after pre- water cooling, 930-970 DEG C of finishing temperature, after final water cooling
680-760 DEG C of temperature, 850-900 DEG C of temperature on cooling table；
(5) be heat-treated: to after forging forging progressive hardening and tempering, and once annealed before quenching or normalizing
Processing.
Further, the step (1), melting bath stirring speed are 50-80r/min, and temperature is 1100-1250 DEG C.
Further, the step (1), the raw material that addition step is added are steel.
Further, the step (2), after refining, by weight, including following element composition: C 0.16-
0.19%, Si 0.40-0.65%, Mn 1.1-1.2%, P≤0.03%, S≤0.03%, V 0.01-0.015%, remaining is
Fe。
Further, the step (2), after refining, by weight, including following element composition: C 0.16%, Si
0.5%, Mn 1.1%, P 0.03%, S 0.02%, V 0.012%, remaining is Fe.
Further, the step (2), after refining, by weight, including following element composition: C 0.17%, Si
0.55%, Mn 1.2%, P 0.02%, S 0.02%, V 0.014%, remaining is Fe.
Further, the step (3), the vacuum suction, vacuum degree 400-600Pa.
Further, the step (3), the vacuum suction, vacuum degree 500Pa.
Further, described program heating is 620-650 DEG C of preheating section, and 1050-1100 DEG C of bringing-up section, soaking zone is
1150-1200 DEG C, 1000-1050 DEG C of start rolling temperature, 910-920 DEG C of temperature after pre- water cooling, 950-970 DEG C of finishing temperature, most
700-760 DEG C of temperature after whole water cooling, 850-880 DEG C of temperature on cooling table.
Further, described program heating is 620 DEG C of preheating section, and 1050 DEG C of bringing-up section, soaking zone is 1170 DEG C, open rolling
1030 DEG C of temperature, 915 DEG C of temperature after pre- water cooling, 960 DEG C of finishing temperature, 720 DEG C of temperature after final water cooling, temperature on cooling table
860℃。
Further, step (5), 750-800 DEG C of the hardening heat, Quenching Soaking Time is based on 0.8-1.0min/mm
It calculates.
Further, step (5), 785 DEG C of the hardening heat, Quenching Soaking Time are calculated by 0.8min/mm.
Further, step (5), 680-720 DEG C of the tempering temperature, tempering insulation time are calculated by 2-2.2min/mm.
Further, step (5), 695 DEG C of the tempering temperature, tempering insulation time are calculated by 2.1min/mm.
Further, step (5), 810-830 DEG C of the annealing temperature, soaking time are calculated by 1.5-1.8min/mm, are protected
After the completion of temperature, natural cooling is powered off in electric furnace.
Further, step (5), 815 DEG C of the annealing temperature, soaking time are calculated by 1.6min/mm.
Further, step (5), 800-820 DEG C of the normalizing temperature, soaking time are calculated by 0.6-1.0min/mm, are protected
It after the completion of temperature, comes out of the stove, in air natural cooling.
Further, step (5), 815 DEG C of the normalizing temperature, soaking time are calculated by 0.8min/mm.
The smelting mode that the present invention is combined using electric furnace smelting, external refining, vacuum outgas, furnace charge use steel, avoid
Excessive impurity is added, improves the degree of purity of raw material, and by the content of the harmful elements such as control P, S, limits vacuum outgas
Vacuum degree in the process improves the low-temperature impact work of product, reduces its temper brittleness tendency, and the performance for improving forging is steady
It is qualitative.
The present invention also provides the fine grain reinforcing bars for the HRB 400E that above-mentioned preparation method obtains.
It is compared with the prior art, the beneficial effects of the present invention are:
1. product yield strength, the tensile strength that the present invention obtains are higher, anti seismic efficiency is more preferable, satisfactory mechanical property.
2. the product elongation that the present invention obtains is higher.
3. preparation method of the present invention is easy to industrialize, cost is relatively low, there is better application prospect.
Specific embodiment
The invention will now be further described with reference to specific embodiments, the advantages and features of the present invention will be with description and
It is apparent, but these examples are merely exemplary, it is not intended to limit the scope of the present invention in any way.Those skilled in the art
Member it should be understood that without departing from the spirit and scope of the invention can details to technical solution of the present invention and form into
Row modifications or substitutions, but these modifications and replacement are fallen within the protection scope of the present invention.
Embodiment 1
(1) electric furnace smelting: being added steel, slag making, slag tap, and in 1100 DEG C, revolving speed to stir under the conditions of 50r/min, obtains
Molten steel；
(2) external refining: obtained molten steel is refined, and obtained molten steel element group becomes C 0.16%, Si
0.5%, Mn 1.1%, P 0.03%, S 0.02%, V 0.012%, Fe 98.178%；
(3) vacuum outgas: vacuum suction to vacuum degree is 500Pa, pours to obtain steel ingot；
(4) forge: program heating, 620 DEG C of preheating section, 1050 DEG C of bringing-up section, soaking zone is 1170 DEG C, start rolling temperature 1030
DEG C, 915 DEG C of the temperature after pre- water cooling, 960 DEG C of finishing temperature, 720 DEG C of temperature, 860 DEG C of temperature on cooling table after final water cooling.
(5) it is heat-treated: successively being annealed, quenched and tempering to the forging after forging.Annealing temperature is 815 DEG C,
Soaking time is 1.6min/mm, and hardening heat is 785 DEG C, soaking time 0.8min/mm, and tempering temperature is 695 DEG C, heat preservation
Time is 2.1min/mm.
Embodiment 2
(1) electric furnace smelting: being added steel, slag making, slag tap, and in 1250 DEG C, revolving speed to stir under the conditions of 80r/min, obtains
Molten steel；
(2) external refining: obtained molten steel is refined, and obtained molten steel element group becomes C 0.17%, Si
0.55%, Mn 1.2%, P 0.02%, S 0.02%, V 0.014%, Fe 98.026%；
(3) vacuum outgas: vacuum suction to vacuum degree is 400Pa, pours to obtain steel ingot；
(4) forge: program heating, 650 DEG C of preheating section, 1100 DEG C of bringing-up section, soaking zone is 1150 DEG C, start rolling temperature 1000
DEG C, 910 DEG C of the temperature after pre- water cooling, 950 DEG C of finishing temperature, 700 DEG C of temperature, 850 DEG C of temperature on cooling table after final water cooling.
(5) it is heat-treated: successively being annealed, quenched and tempering to the forging after forging.Annealing temperature is 810 DEG C,
Soaking time is 1.5min/mm, and hardening heat is 750 DEG C, soaking time 1min/mm, and tempering temperature is 680 DEG C, when heat preservation
Between be 2min/mm.
Embodiment 3
(1) electric furnace smelting: being added steel, slag making, slag tap, and in 1200 DEG C, revolving speed to stir under the conditions of 60r/min, obtains
Molten steel；
(2) external refining: obtained molten steel is refined, and obtained molten steel element group becomes C 0.19%, Si
0.4%, Mn 1.2%, P 0.01%, S 0.01%, V 0.011%, Fe 98.179%；
(3) vacuum outgas: vacuum suction to vacuum degree is 550Pa, pours to obtain steel ingot；
(4) forge: program heating, 630 DEG C of preheating section, 1080 DEG C of bringing-up section, soaking zone is 1200 DEG C, start rolling temperature 1050
DEG C, 920 DEG C of the temperature after pre- water cooling, 970 DEG C of finishing temperature, 760 DEG C of temperature, 880 DEG C of temperature on cooling table after final water cooling.
(5) it is heat-treated: normalizing, quenching and tempering is successively carried out to the forging after forging.Normalizing temperature is 815 DEG C,
Soaking time is 0.8min/mm, and hardening heat is 800 DEG C, soaking time 0.9min/mm, and tempering temperature is 720 DEG C, heat preservation
Time is 2.2min/mm.
Comparative example 1
Compared with Example 1, step (3) vacuum degree is different, and vacuum degree is 800Pa in 1 step of comparative example (3).
Comparative example 2
Compared with Example 1, temperature program is different in step (4), 2 temperature programmed work of comparative example are as follows: preheating section 680
DEG C, 1000 DEG C of bringing-up section, soaking zone is 1300 DEG C, 11000 DEG C of start rolling temperature, 900 DEG C of temperature after pre- water cooling, and finishing temperature
940 DEG C, 690 DEG C of temperature, 890 DEG C of temperature on cooling table after final water cooling.
Comparative example 3
Compared with Example 1, the heat treatment method of step (5) is different.
Specific steps (5) operation are as follows: quenching and tempering are successively carried out to the forging after forging.Hardening heat is 785
DEG C, soaking time 0.8min/mm, tempering temperature is 695 DEG C, soaking time 2.1min/mm.
Effect example 1
According to the material performance requirement of GB1499.2-2018 standard, material is carried out to the product of embodiment 1-3, comparative example 1-3
Expect performance test, test result is as follows:
Effect example 2
According to the metallographic performance requirement of GB1499.2-2018 standard, gold is carried out to the product of embodiment 1-3, comparative example 1-3
Phase performance test, test result is as follows:
Effect example 3
It is evaluated according to GB6394-2002 metal mean grain size ranking method, as a result as follows:
| Group | Grain size grading |
| Embodiment 1 | 11 grades |
| Embodiment 2 | 10 grades |
| Embodiment 3 | 10 grades |
| Comparative example 1 | 6 grades |
| Comparative example 2 | 7 grades |
| Comparative example 3 | 7 grades |
Integration test result is it is found that the application has following advantages:
1. product yield strength, the tensile strength that the present invention obtains are higher, anti seismic efficiency is more preferable, satisfactory mechanical property.
2. the product elongation that the present invention obtains is higher.
3. the product metallographic that the present invention obtains meets newest national standard, and grain size number is higher.
4. preparation method of the present invention is easy to industrialize, cost is relatively low, there is better application prospect.
The technical means disclosed in the embodiments of the present invention is not limited only to above-mentioned disclosed technological means, further includes by the above skill
Technical solution composed by art feature any combination.The foregoing is a specific embodiment of the present invention, it is noted that for this
For the those of ordinary skill of technical field, without departing from the principle of the present invention, it can also make several improvements and repair
Decorations, these also will be regarded as protection scope of the present invention.
Claims (10)
1. a kind of fine grain reinforcing bar preparation method for producing HRB 400E, which comprises the following steps:
(1) electric furnace smelting: charging slag making, is slagged tap, melting bath stirring, and molten steel is obtained；
(2) external refining: obtained molten steel is refined；
(3) vacuum outgas: vacuum suction pours to obtain steel ingot；
(4) forge: program heating, 600-650 DEG C of preheating section, 1000-1100 DEG C of bringing-up section, soaking zone is 1100-1200 DEG C, is opened
Roll 950-1050 DEG C of temperature, 900-950 DEG C of the temperature after pre- water cooling, 930-970 DEG C of finishing temperature, the temperature after final water cooling
680-760 DEG C, 850-900 DEG C of temperature on cooling table；
(5) be heat-treated: to after forging forging progressive hardening and tempering, and once annealed before quenching or normalizing at
Reason.
2. the method according to claim 1, wherein the step (2), after refining, by weight, including with
Lower element composition: C 0.16-0.19%, Si 0.40-0.65%, Mn 1.1-1.2%, P≤0.03%, S≤0.03%, V
0.01-0.015%, remaining is Fe.
3. the method according to claim 1, wherein the step (2), after refining, by weight, including with
Lower element composition: C 0.16%, Si 0.5%, Mn 1.1%, P 0.03%, S 0.02%, V 0.012%, remaining is Fe.
4. the method according to claim 1, wherein the step (3), the vacuum suction, vacuum degree are
400-600Pa。
5. the method according to claim 1, wherein the step (4), described program heating is preheating section 620-
650 DEG C, 1050-1100 DEG C of bringing-up section, soaking zone is 1150-1200 DEG C, 1000-1050 DEG C of start rolling temperature, the temperature after pre- water cooling
910-920 DEG C of degree, 950-970 DEG C of finishing temperature, 700-760 DEG C of temperature, 850-880 DEG C of temperature on cooling table after final water cooling.
6. the method according to claim 1, wherein the step (4), described program heating is preheating section 620
DEG C, 1050 DEG C of bringing-up section, soaking zone is 1170 DEG C, 1030 DEG C of start rolling temperature, 915 DEG C of temperature after pre- water cooling, and finishing temperature 960
DEG C, 720 DEG C of the temperature after final water cooling, 860 DEG C of temperature on cooling table.
7. preparation method according to claim 1, which is characterized in that step (5), 750-800 DEG C of the hardening heat are quenched
Fiery soaking time is calculated by 0.8-1.0min/mm；680-720 DEG C of the tempering temperature, tempering insulation time press 2-2.2min/mm
It calculates.
8. preparation method according to claim 1, which is characterized in that step (5), 810-830 DEG C of the annealing temperature are protected
The warm time is calculated by 1.5-1.8min/mm, and after the completion of heat preservation, natural cooling is powered off in electric furnace.
9. preparation method according to claim 1, which is characterized in that step (5), 800-820 DEG C of the normalizing temperature are protected
The warm time is calculated by 0.6-1.0min/mm, after the completion of heat preservation, is come out of the stove, in air natural cooling.
10. the fine grain reinforcing bar for the HRB 400E that any preparation method of claim 1-9 obtains.
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