CN101417293A - HRB 400 steel bar production method - Google Patents
HRB 400 steel bar production method Download PDFInfo
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- CN101417293A CN101417293A CNA2007101763698A CN200710176369A CN101417293A CN 101417293 A CN101417293 A CN 101417293A CN A2007101763698 A CNA2007101763698 A CN A2007101763698A CN 200710176369 A CN200710176369 A CN 200710176369A CN 101417293 A CN101417293 A CN 101417293A
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Abstract
The invention relates to a production method of an HRB400 steel bar, and the material of steel bloom is 20MnSi by component optimization. The technical process comprises bessemerizing, argon-blowing refinement, continuous casting, lower-temperature rolling, rolling control among machines and stepping cooling control after rolling; and recovering sections are arranged among cooling sections. The adoption of the technology for producing the HRB400 steel bar, not only can greatly reduce cost, but also can degrade the requirements on the capacity of rolling mills and cooling control equipment among the machines so as to improve the applicability thereof. The product specifications range phi 10-phi40mm, the produced HRB400 steel bar has stable structure property and good welding and anti-quake properties.
Description
Technical field
The present invention relates to a kind of production method of HRB400 reinforcing bar, be specially adapted to the method that controlled rolling and controlled cooling is produced the HRB400 reinforcing bar.
Background technology
The national standard " Code for design of concrete structures " that played enforcement on April 1st, 2002 is clearly with the main force reinforcing bar of HRB400 grade reinforcing steel as Chinese reinforced concrete structure, wherein can weld, anti-seismic steel bar not only requires yield strength 〉=400Mpa, tensile strength 〉=570Mpa, but also requiring the actual measurement tensile strength and the ratio σ b/ σ s of actual measurement yield strength to be not less than 1.25, the ratio of reinforcing bar actual measurement yield strength and HRB400 reinforcing bar SMYS 400MPa is not more than 1.30.The production technology of HRB400 grade reinforcing steel mainly is to adopt 20MnSi microalloying (one or more in adding vanadium, niobium, the titanium) at present, production method as the described a kind of HRB400 reinforcing bar of patent application ZL200610081495.0, adopt the Nb microalloying and roll back grading control Nb and separate out process for cooling and produce the HRB400 reinforcing bar, technology comparative maturity and stable, but can increase substantially production cost.
Summary of the invention
The invention provides a kind of production method of HRB400 reinforcing bar, steel billet material composition is 20MnSi, technological process is that converter smelting → ar blowing refining → direct casting → steel billet inspection → heating furnace heating → controlled rolling → rolling the back grading control cools off, start rolling temperature is controlled at 900-1050 ℃, the finish rolling inlet temperature is controlled at 800-950 ℃, finishing temperature is controlled at 900-1000 ℃, roll the back and adopt the two-part grading control type of cooling, go out one cold section temperature and be controlled at 750～850 ℃, go out that cold bed temperature is controlled at 680-750 ℃ on the secondary cooling zone, one is cold, the recovery section that 8-10 rice is arranged between the secondary cooling zone.
The invention provides a kind of production method of HRB400 reinforcing bar, the composition of its steel billet material is controlled at 0.45%≤Ceq≤0.52%.
Adopt the beneficial effect of the production method of a kind of HRB400 reinforcing bar of the present invention:
(1) the present invention does not need to add any microalloy, reduces production costs significantly.
(2) the present invention guarantees that by optimizing composition welding heat affected zone intensity does not descend, and has satisfied the requirement of welding performance and anti-seismic performance.
(3) the present invention adopts lower temperature open rolling, inter-stand cooling technology, omnidistance thinning microstructure is organized homogenising with guaranteeing surface, core, and employing is rolled, and the back is rapid, the also accurate control of classification cooling final cooling temperatures at different levels, not only guaranteed the uniform and stable property of reinforcing bar structure property, and reduced requirement to control-cooling equipment ability between milling train and machine, improved the applicability of this technology.
(4) the present invention takes lower temperature distortion finish to gauge technology, and finish to gauge frame load improves less, and structure property satisfies the requirement of one-level anti-seismic steel bar.
The specific embodiment
Embodiments of the invention, technological process are that converter smelting → ar blowing refining → direct casting → steel billet inspection → heating furnace heating → controlled rolling → rolling the back grading control cools off.Tapping back soft blow argon 15 minutes; Steel billet composition C:0.22%, Si:0.51%, Mn:1.44%, P:0.012%, S:0.010%, Ceq:0.46%; Start rolling temperature 960-980 ℃, the rolling effectively refine austenite crystal grain of lower temperature; 860-870 ℃ of finish rolling inlet temperature, higher final rolling temperature can guarantee that mm finishing mill unit works in the motor load limit of power; Finishing temperature 980-990 ℃, because finishing temperature is higher, cooling control after rolling is very crucial, roll the back and adopt the two-part grading control type of cooling, it is cold that last rolling mill comes out and then to roll back one, and reinforcing bar is in time cooled off, suppress growing up of crystal grain, gone out 770～780 ℃ of one cold section temperature; Go out that cold bed temperature is controlled at 730-740 ℃ on the secondary cooling zone; One, the section of recovery is arranged in the middle of the secondary cooling zone, can reduce the reinforcing bar internal-external temperature difference, improve the inside and outside structural homogenity of reinforcing bar; Roll the back and adopt the grading control process for cooling both to guarantee the cooling target temperature, guaranteed the strength character of reinforcing bar again, avoided rebar surface cold tissue to occur.
The controlled rolling and controlled cooling HRB400 reinforcing bar that the present invention is produced has carried out tension test in enormous quantities, metallographic structure check, impact test, electroslag pressure welding, flash butt welding, overlap welding test, and the result all meets the requirement of relevant criterion.
Composition and performance statistics such as following table 1 in August, 2006 to the 2007 year batch process in May of controlled rolling and controlled cooling HRB400 reinforcing bar.
Table 1. controlled rolling and controlled cooling HRB400 reinforcing bar in August, 2006 to 2007 year production in May statistics
A kind of production method that adopts controlled rolling and controlled cooling to produce the HRB400 reinforcing bar that the present invention relates to is produced the HRB400 reinforcing bar with the Nb microalloying and is compared, and reduces cost of alloy 50-100 unit/ton steel (changing with Nb iron price change).Advantage of the present invention and effect mainly contain following 3 points, and 1, do not add microalloy, significantly reduce production costs; 2, optimize composition and technological design, guarantee to satisfy the requirement of welding and anti-seismic performance; 2, the rolling and post-rolling control cooling process of optimal control guarantees that cold tissue did not appear in rebar surface and performance satisfies under the prerequisite of standard-required, reduces the load of milling equipment as far as possible; 3, solve the specification effect problem; 4, adopt the present invention can produce φ 10～φ 40mm specification HRB400 reinforcing bar.
Claims (2)
1, a kind of production method of HRB400 reinforcing bar, steel billet material composition is 20MnSi, technological process is that converter smelting → ar blowing refining → direct casting → steel billet inspection → heating furnace heating → controlled rolling → rolling the back grading control cools off, it is characterized in that: start rolling temperature 900-1050 ℃, 800-950 ℃ of finish rolling inlet temperature, finishing temperature 900-1000 ℃, roll the back and adopt the two-part grading control type of cooling, go out one cold section temperature and be controlled at 750～850 ℃, go out that cold bed temperature is controlled at 680-750 ℃ on the secondary cooling zone, the recovery section of 8-10 rice is arranged between one cold, the secondary cooling zone.
2, as the production method of claims 1 described a kind of HRB400 reinforcing bar, it is characterized in that: the composition of steel billet material is controlled at 0.45%≤Ceq≤0.52%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101763698A CN101417293A (en) | 2007-10-26 | 2007-10-26 | HRB 400 steel bar production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101763698A CN101417293A (en) | 2007-10-26 | 2007-10-26 | HRB 400 steel bar production method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101417293A true CN101417293A (en) | 2009-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101763698A Pending CN101417293A (en) | 2007-10-26 | 2007-10-26 | HRB 400 steel bar production method |
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| CN (1) | CN101417293A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920271A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar |
| CN102061369A (en) * | 2011-01-24 | 2011-05-18 | 南通宝钢钢铁有限公司 | Method for preparing chloride ion corrosion resistant quake-proof bar |
| CN102345052A (en) * | 2011-11-01 | 2012-02-08 | 莱芜钢铁集团有限公司 | Production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar |
| CN102989763A (en) * | 2012-11-26 | 2013-03-27 | 首钢总公司 | Production method of four-segment high-strength aseismic reinforcement |
| CN103924037A (en) * | 2014-04-28 | 2014-07-16 | 湖南华菱涟源钢铁有限公司 | HRB400 hot-rolled reinforcement bar production technology |
| CN103990648A (en) * | 2014-04-10 | 2014-08-20 | 宝钢集团新疆八一钢铁有限公司 | Anchor rod reinforcing steel bar in 400-MPa level and production method thereof |
| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN115418474A (en) * | 2022-09-02 | 2022-12-02 | 福建三宝钢铁有限公司 | HRB500E sectional aerosol cooling process |
-
2007
- 2007-10-26 CN CNA2007101763698A patent/CN101417293A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920271A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar |
| CN101920271B (en) * | 2010-07-27 | 2012-02-15 | 福建三宝特钢有限公司 | Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar |
| CN102061369A (en) * | 2011-01-24 | 2011-05-18 | 南通宝钢钢铁有限公司 | Method for preparing chloride ion corrosion resistant quake-proof bar |
| CN102061369B (en) * | 2011-01-24 | 2012-10-03 | 南通宝钢钢铁有限公司 | Method for preparing chloride ion corrosion resistant quake-proof bar |
| CN102345052A (en) * | 2011-11-01 | 2012-02-08 | 莱芜钢铁集团有限公司 | Production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar |
| CN102989763A (en) * | 2012-11-26 | 2013-03-27 | 首钢总公司 | Production method of four-segment high-strength aseismic reinforcement |
| CN103990648A (en) * | 2014-04-10 | 2014-08-20 | 宝钢集团新疆八一钢铁有限公司 | Anchor rod reinforcing steel bar in 400-MPa level and production method thereof |
| CN103990648B (en) * | 2014-04-10 | 2016-06-15 | 宝钢集团新疆八一钢铁有限公司 | A kind of 400MPa level anchor pole reinforcing bar and production method thereof |
| CN103924037A (en) * | 2014-04-28 | 2014-07-16 | 湖南华菱涟源钢铁有限公司 | HRB400 hot-rolled reinforcement bar production technology |
| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN115418474A (en) * | 2022-09-02 | 2022-12-02 | 福建三宝钢铁有限公司 | HRB500E sectional aerosol cooling process |
| CN115418474B (en) * | 2022-09-02 | 2023-08-08 | 福建三宝钢铁有限公司 | HRB500E segmented aerosol cooling process |
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Open date: 20090429 |