CN106319179A - Production technology for HRB400 coiled fine-grain reinforcing steel bar - Google Patents
Production technology for HRB400 coiled fine-grain reinforcing steel bar Download PDFInfo
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- CN106319179A CN106319179A CN201610796076.9A CN201610796076A CN106319179A CN 106319179 A CN106319179 A CN 106319179A CN 201610796076 A CN201610796076 A CN 201610796076A CN 106319179 A CN106319179 A CN 106319179A
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- Prior art keywords
- reinforcing bar
- hrb400
- fine grain
- valve snail
- controlling
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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
- C21D8/065—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
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
Abstract
The invention discloses a production technology for an HRB400 coiled fine-grain reinforcing steel bar. The technology includes the following steps that firstly, converter smelting is conducted, wherein a 20 MnSi steel billet is subjected to converter smelting, argon stirring is conducted during smelting, and the tapping temperature of molten steel is controlled to range from 1620 DEG C to 1700 DEG C; secondly, a square billet is subjected to continuous casting, wherein the molten steel obtained after tapping is subjected to continuous casting, and the square billet is formed; thirdly, rolling is conducted, wherein the square billet obtained after continuous casting is rolled, the temperature of a rolling inlet is controlled to range from 900 DEG C to 950 DEG C, and a steel bar is formed; and fourthly, cooling is conducted, the rolled reinforcing steel bar is cooled, the spinning temperature is controlled to range from 820 DEG C to 840 DEG C, and the finished HRB400 coiled fine-grain reinforcing steel bar is formed. The comprehensive mechanical performance of the HRB400 coiled fine-grain reinforcing steel bar obtained through the technology is better, the overall performance difference of the reinforcing steel bar is also smaller, and the product qualification rate can reach 100%.
Description
Technical field
The present invention relates to reinforcing bar technical field of producing, be specifically related to the production of a kind of HRB400 valve snail fine grain reinforcing bar
Technique.
Background technology
Fine-grained steel has another name called inherent fine grain steel, is that metal material makes its essence by some heat treatment method crystal grain thinnings
Grain size reaches 5 to 8 grades, thus improves the steel of its mechanical performance.Inherent grain size refers to steel austenite under certain condition
The tendency that crystal grain is grown up, measures austenite crystal after 930 ± 10 DEG C of insulations 3～8h.Fine-grained steel can be used for petrochemical industry, coal
Conversion, nuclear power, steam turbine cylinder, thermoelectricity etc. use the main equipment that condition is harsh, corrosive medium is complicated, such as: water scrubber, second
Change furnace, coke drum, desulfurizer, conversion gas waste heat boiler, methanation furnace, reactor, regenerator, hydrogenation reactor, methanation
Heater, conversion gas steam generator.
, as many employing microalloying steel billets such as fine grain valve snail reinforcing bar produce, there is product in fine-grained steel and product at present
Product 90% are without the big problem of yield point elongation and overall poor performance, and mechanical property is poor, and conforming product rate is relatively low；Additionally, its cost
The highest.
Summary of the invention
In view of this, the application provides the production technology of a kind of HRB400 valve snail fine grain reinforcing bar, gained HRB400 valve snail
The comprehensive mechanical property of fine grain reinforcing bar is more preferable, and the overall poor performance of reinforcing bar is the least, and conforming product rate can reach 100%.
For solving above technical problem, the technical scheme that the present invention provides is the life of a kind of HRB400 valve snail fine grain reinforcing bar
Production. art, described technique comprises the following steps:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, control molten steel tapping temperature
It it is 1,620 1700 DEG C；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 900 950 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 820 840 DEG C, forms HRB400 dish
Spiral shell fine grain reinforcing bar finished product.
Preferably, described HRB400 valve snail fine grain reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮
10.0HRB400 valve snail fine grain reinforcing bar.
Preferably, described step (1) converter smelting also includes that controlling molten steel composition is C 0.18 0.25wt%, Si
0.40 0.60wt%, Mn 1.20 1.40wt%, P≤0.045wt%, S≤0.045%, surplus is Fe.
Being more highly preferred to, described step (1) converter smelting also includes that controlling molten steel composition is C 0.21 0.25wt%,
Si0.40 0.50wt%, Mn 1.20 1.30wt%, P≤0.045wt%, S≤0.045%, surplus is Fe.
Preferably, in described step (4) cooling, controlling laying temperature is 820 830 DEG C.
Preferably, described step (4) cooling also includes controlling rollgang linear velocity.
Being more highly preferred to, described control rollgang linear velocity is particularly as follows: control conveying roller diatom front end speed is
0.35 0.40m/s, rear end speed is 0.80 0.90m/s.
Being more highly preferred to, described control rollgang linear velocity is particularly as follows: control conveying roller diatom front end speed is
0.38m/s, rear end speed is 0.83m/s.
In technical scheme, using bloom production HRB400 valve snail fine grain reinforcing bar, concrete steel billet is
20MnSi steel billet, HRB400 valve snail fine grain reinforcing bar be ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail thin
Crystal grain reinforcing bar, controls the composition of molten steel and the tapping temperature of molten steel；Qualified HRB400 dish is gone out with 20MnSi bloom production
Spiral shell fine grain reinforcing bar, uses controlled rolling and Controlled cooling process, owing to intensity, percentage elongation are required higher by HRB400 reinforcing bar,
The reinforcing bar tissue of requirement 20MnSi bloom production should have the ferrite crystal grain of refinement and less pearlite interlaminar spacing, by
Thick pearlite will be generated, so heating, the operation of rolling must control the grain size of austenite in thick austenite.
In the operation of rolling, owing to using strict temperature control measures, thus obtain the fine grain Ovshinsky of uneven components
Body and the most molten a large amount of second phase so that during austenite cooling, the nucleation rate of its catabolic process increases, reduces stablizing of austenite
Property, the C curve of 20MnSi steel moves to left, and creates advantage for subsequent control cooling；In cooling procedure, due to 20MnSi steel
The temperature that Cooling Austenite Transformation is pearlite during for Ar1～500 DEG C, it is therefore desirable to before phase transformation, austenite should have
Bigger degree of supercooling and rate of cooling, to improve phase varying force；After reaching transformation temperature, wire rod Slow cooling should be made, it is ensured that fully
Transformation time, be beneficial to improve pearlite ratio, owing to 20MnSi steel belongs to sub-eutectoid steel, about 900 DEG C cool down time the most raw
Becoming pro-eutectoid ferrite, if Slow cooling during this temperature, ferrite will separate out in a large number at austenite grain boundary, after phase transformation, obtain
The pearlite ratio obtained is relatively low, causes steel bar mechanics performance relatively low；If rate of cooling is relatively in transition process for overcooling austenite
Height, ferrite has little time to separate out completely and just separates out cementite, after phase transformation, it is thus achieved that pearlite ratio higher, it is thus achieved that reinforcing bar power
Learn performance the highest；If overcooling austenite rate of cooling in transition process is higher, reach the rate of cooling after transformation temperature the most relatively
Height, can cause transformation time can not be guaranteed, and transmutation product medium pearlite ratio will be caused to decline；Reach the cooling after transformation temperature
When speed is higher, reinforcing bar tissue there will be hard phase constitution (such as bayesian tissue or Widmannstatten structure), cause reinforcing bar without yield point elongation
Or mechanical performance declines.
Therefore, in technical scheme, when with 20MnSi bloom production HRB400 valve snail fine grain reinforcing bar, control
Rolling sequence uses strict temperature control measures, it is ensured that austenite crystal is the most drastically grown up, and is controlling cooling stage, at supercool Ovshinsky
Body transition process uses quickly cooling, after reaching transformation temperature, uses Slow cooling, on the one hand can reduce the generation of hard phase, separately
On the one hand in turn ensure that sufficient transformation time, improve pearlite ratio, it is thus achieved that preferably mechanical property, the overall property of reinforcing bar
Can be poor the least.
Compared with prior art, its detailed description is as follows for the application: prior art produces HRB400 valve snail fine grain reinforcing bar
Technique, use microalloying steel billets to produce more, there is product 90% without the big problem of yield point elongation and overall poor performance, part
Use the fine grain valve snail reinforcing bar product of 20MnSi bloom production, there is also product 90% without yield point elongation, from reinforcing bar quality testing
Can see, on the premise of same steel billet smelting component, the surrender of the fine grain valve snail reinforcing bar that technical scheme obtains is strong
Degree (R0 el) more than 440MPa, tensile strength (R0 m) more than 600MPa, percentage elongation (A%) is more than 19%, maximum, force percentage of total elongation
(Agt) more than 9.0%, grain size more than 10 grades, comprehensive mechanical property is more preferable, and conforming product rate reaches 100%, saves into simultaneously
This, reinforcing bar per ton can save production cost about 20 yuan.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with specific embodiment pair
The present invention is described in further detail.
Embodiment 1
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar described in the present embodiment, wherein HRB400 valve snail fine grain
Reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail fine grain reinforcing bar, and described technique includes following step
Rapid:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, control molten steel composition is C
0.23wt%, Si 0.45wt%, Mn 1.25wt%, P≤0.045wt%, S≤0.045%, surplus is Fe, controls molten steel and goes out
Furnace temperature is 1,620 1700 DEG C；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 925 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 830 DEG C, controls conveying roller diatom front end
Speed is 0.38m/s, and rear end speed is 0.83m/s, forms HRB400 valve snail fine grain reinforcing bar finished product.
The fine grain valve snail reinforcement property such as table 1 that above-mentioned technique is produced.
Table 1 embodiment 1 technique prepares the performance of fine grain valve snail reinforcing bar
Embodiment 2
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar described in the present embodiment, wherein HRB400 valve snail fine grain
Reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail fine grain reinforcing bar, and described technique includes following step
Rapid:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, control molten steel composition is C
0.18wt%, Si 0.40wt%, Mn 1.20wt%, P≤0.045wt%, S≤0.045%, surplus is Fe, controls molten steel and goes out
Furnace temperature is 1,620 1700 DEG C；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 900 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 820 DEG C, controls conveying roller diatom front end
Speed is 0.35m/s, and rear end speed is 0.80m/s, forms HRB400 valve snail fine grain reinforcing bar finished product.
The fine grain valve snail reinforcement property such as table 2 that above-mentioned technique is produced.
Table 2 embodiment 2 technique prepares the performance of fine grain valve snail reinforcing bar
Embodiment 3
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar described in the present embodiment, wherein HRB400 valve snail fine grain
Reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail fine grain reinforcing bar, and described technique includes following step
Rapid:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, control molten steel composition is C
0.25wt%, Si 0.60wt%, Mn 1.40wt%, P≤0.045wt%, S≤0.045%, surplus is Fe, controls molten steel and goes out
Furnace temperature is 1,620 1700 DEG C；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 950 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 840 DEG C, controls conveying roller diatom front end
Speed is 0.40m/s, and rear end speed is 0.90m/s, forms HRB400 valve snail fine grain reinforcing bar finished product.
The fine grain valve snail reinforcement property such as table 3 that above-mentioned technique is produced.
Table 3 embodiment 3 technique prepares the performance of fine grain valve snail reinforcing bar
Embodiment 4
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar described in the present embodiment, wherein HRB400 valve snail fine grain
Reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail fine grain reinforcing bar, and described technique includes following step
Rapid:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, control molten steel composition is C
0.21wt%, Si 0.40wt%, Mn 1.20wt%, P≤0.045wt%, S≤0.045%, surplus is Fe, controls molten steel and goes out
Furnace temperature is 1,620 1700 DEG C；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 900 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 820 DEG C, controls conveying roller diatom front end
Speed is 0.40m/s, and rear end speed is 0.80m/s, forms HRB400 valve snail fine grain reinforcing bar finished product.
The fine grain valve snail reinforcement property such as table 4 that above-mentioned technique is produced.
Table 4 embodiment 4 technique prepares the performance of fine grain valve snail reinforcing bar
Embodiment 5
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar described in the present embodiment, wherein HRB400 valve snail fine grain
Reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail fine grain reinforcing bar, and described technique includes following step
Rapid:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, control molten steel composition is C
0.25wt%, Si 0.50wt%, Mn 1.30wt%, P≤0.045wt%, S≤0.045%, surplus is Fe, controls molten steel and goes out
Furnace temperature is 1,620 1700 DEG C；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 900 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 840 DEG C, controls conveying roller diatom front end
Speed is 0.35m/s, and rear end speed is 0.90m/s, forms HRB400 valve snail fine grain reinforcing bar finished product.
The fine grain valve snail reinforcement property such as table 5 that above-mentioned technique is produced.
Table 5 embodiment 5 technique prepares the performance of fine grain valve snail reinforcing bar
Below it is only the preferred embodiment of the present invention, it is noted that it is right that above-mentioned preferred implementation is not construed as
The restriction of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, it is also possible to make some improvements and modifications, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (8)
1. the production technology of a HRB400 valve snail fine grain reinforcing bar, it is characterised in that: described technique comprises the following steps:
(1) converter smelting: 20MnSi steel billet is carried out converter smelting, Argon stirring in smelting, controlling molten steel tapping temperature is
1620—1700℃；
(2) continuous casting square billet: the molten steel after coming out of the stove carries out continuous casting, forms square billet；
(3) rolling: being rolled by the square billet after continuous casting, controlled rolling inlet temperature is 900 950 DEG C, forms reinforcing bar；
(4) cooling: cooled down by the reinforcing bar after rolling, controlling laying temperature is 820 840 DEG C, forms HRB400 valve snail thin
Crystal grain reinforcing bar finished product.
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar the most according to claim 1, it is characterised in that: described
HRB400 valve snail fine grain reinforcing bar is ∮ 8.0HRB400 valve snail fine grain reinforcing bar or ∮ 10.0HRB400 valve snail fine grain reinforcing bar.
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar the most according to claim 1, it is characterised in that: described step
Suddenly (1) converter smelting also includes that controlling molten steel composition is C 0.18 0.25wt%, Si 0.40 0.60wt%, Mn 1.20
1.40wt%, P≤0.045wt%, S≤0.045%, surplus is Fe.
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar the most according to claim 3, it is characterised in that: described step
Suddenly (1) converter smelting also includes that controlling molten steel composition is C 0.21 0.25wt%, Si 0.40 0.50wt%, Mn 1.20
1.30wt%, P≤0.045wt%, S≤0.045%, surplus is Fe.
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar the most according to claim 1, it is characterised in that: described step
Suddenly, in (4) cooling, controlling laying temperature is 820 830 DEG C.
The production technology of a kind of HRB400 valve snail fine grain reinforcing bar the most according to claim 1, it is characterised in that: described step
Suddenly (4) cooling also includes controlling rollgang linear velocity.
A kind of technique using bloom production fine grain valve snail reinforcing bar the most according to claim 6, it is characterised in that: described
Controlling rollgang linear velocity particularly as follows: controlling conveying roller diatom front end speed is 0.35 0.40m/s, rear end speed is
0.80—0.90m/s。
A kind of technique using bloom production fine grain valve snail reinforcing bar the most according to claim 7, it is characterised in that: described
Controlling rollgang linear velocity particularly as follows: controlling conveying roller diatom front end speed is 0.38m/s, rear end speed is 0.83m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796076.9A CN106319179A (en) | 2016-08-31 | 2016-08-31 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796076.9A CN106319179A (en) | 2016-08-31 | 2016-08-31 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
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| CN106319179A true CN106319179A (en) | 2017-01-11 |
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ID=57786565
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| CN201610796076.9A Pending CN106319179A (en) | 2016-08-31 | 2016-08-31 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
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Cited By (3)
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| 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 |
| CN111763886A (en) * | 2020-06-30 | 2020-10-13 | 武汉钢铁有限公司 | 400 MPa-grade hot-rolled spiral shell and production method thereof |
| CN111893279A (en) * | 2020-08-12 | 2020-11-06 | 宝武集团鄂城钢铁有限公司 | Stelmor air-cooled wire-controlled cold production method of HRB400(E) deformed steel bar with yield strength of more than or equal to 420MPa |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111763886A (en) * | 2020-06-30 | 2020-10-13 | 武汉钢铁有限公司 | 400 MPa-grade hot-rolled spiral shell and production method thereof |
| CN111763886B (en) * | 2020-06-30 | 2022-01-25 | 武汉钢铁有限公司 | 400 MPa-grade hot-rolled spiral shell and production method thereof |
| CN111893279A (en) * | 2020-08-12 | 2020-11-06 | 宝武集团鄂城钢铁有限公司 | Stelmor air-cooled wire-controlled cold production method of HRB400(E) deformed steel bar with yield strength of more than or equal to 420MPa |
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Application publication date: 20170111 |