CN110453145A - High-strength quake-proof reinforcing steel bar and rolling mill practice - Google Patents
High-strength quake-proof reinforcing steel bar and rolling mill practice Download PDFInfo
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- CN110453145A CN110453145A CN201910768556.8A CN201910768556A CN110453145A CN 110453145 A CN110453145 A CN 110453145A CN 201910768556 A CN201910768556 A CN 201910768556A CN 110453145 A CN110453145 A CN 110453145A
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- rolling
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Classifications
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- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of high-strength quake-proof reinforcing steel bars, by weight percentage, it include: C:0.24-0.28%, Si:0.50-0.80%, Mn:1.40-1.60%, S≤0.040%, P≤0.040%, V:0.120-0.160%, Nb:0.010-0.030%, N:0.0140-0.0220%, remaining is Fe and inevitable impurity.Rolling mill practice is comprising steps of (1) prepares ingredient according to each composition by weight percent；(2) prepare the steel billet for being suitble to size.(3) it rolls, wherein 1000-1200 DEG C of billet heating temperature, 1150-1230 DEG C of soaking temperature, 1100-1200 DEG C of start rolling temperature.(4) upper cold bed after heating rolling, natural cooling and bundling are stacked.Reinforcing bar alloy system of the invention is simple, is easy to blank smelting and produces with Optimization of Continuous Casting, not using precious alloys such as nickel, molybdenums, and niobium, content of vanadium are lower, and product cost of alloy is low；The high tensile reinforcement of exploitation has excellent comprehensive performance and security performance, it is ensured that the durability and safety, popularization and application foreground of key project building are good.
Description
Technical field
The present invention relates to high tensile reinforcement technical fields, and in particular to a kind of 630MPa grades and the above hot rolling high-strength quake-proof reinforcing steel bar
And its rolling mill practice.
Background technique
Hot-rolling high-strength steel muscle has high-intensitive, excellent comprehensive performance (processing performance, welding performance, ductility, shock resistance because of it
Can be equal), energy conservation and environmental protection, long service life, it is highly-safe the advantages that can be applied to high-rise, long span building structure, civil air defense constructions and installations
Etc. key projects.Country is advocating energy-saving and emission-reduction, environmentally protective always energetically in recent years, as accounting for national economy critical role
Building trade promotes and applies high tensile reinforcement and not only complies with contemporary green, energy-efficient development trend, but also can significantly improve building
The safety of structure and total quality.Although the yield and growth rate of China's high tensile reinforcement are in the situation of cumulative year after year in recent years,
But comparison European and American developed countries, China 600MPa grades and the above grade high-strength reinforcing bar accounting it is still relatively low.
The more non-antidetonation high-strength quake-proof reinforcing steel bar of the security performance of hot rolling high-strength quake-proof reinforcing steel bar can greatly improve, but produce hardly possible
Degree can increase, and the production difficulty of intensity rank more high anti-seismic reinforcing bar is bigger.It is at the same level in addition to meeting that this is mainly due to anti-seismic steel bars
Outside the performance indicator of not non-anti-seismic steel bar defined, actual measurement tensile strength and the actual measurement yield strength for also needing to meet anti-seismic steel bar are special
The ratio between sign >=1.25；The ratio between yield strength characteristic value as defined in actual measurement yield strength and standard≤1.30；The maximum, force of reinforcing bar is total
The technical requirements of elongation >=9.0%.Above-mentioned technical performance index can ensure that reinforcing bar has good shock resistance, improve building
Durability and safety.
Currently, there are many production method of 630MPa grades of the country and the above high tensile reinforcement, but Composition Control and product shock resistance
It can have a certain difference, mostly be by improving carbon, nitrogen content, the expensive alloying elements ingredient for adding high level designs, though
Right intensity can satisfy requirement, but anti-seismic performance, welding performance, extensibility will receive influence；High tensile reinforcement produces work simultaneously
Skill is compared with regular reinforcement complexity, for example increases the complicated technologies such as cold refinery practice, blank heap, controlled rolling and controlled cooling or burning optimization on line,
The high-volume for greatly limiting high tensile reinforcement promotes and applies, while having some impact on to the safety and stability of building.
Summary of the invention
Goal of the invention: that the present invention provides a kind of rolling mill practices is simple, cost of alloy is low, has excellent comprehensive performance and peace
The 630MPa grade of full performance and the above hot rolling high-strength quake-proof reinforcing steel bar product and production method, to meet long span building engineering, people
The emphasis such as preventing engineering do requirement of the engineering to reinforcing bar comprehensive performance, security performance.
Technical solution: high-strength quake-proof reinforcing steel bar of the invention, by weight percentage, comprising: C:0.24-0.28%, Si:
0.50-0.80%, Mn:1.40-1.60%, S≤0.040%, P≤0.040%, V:0.120-0.160%, Nb:0.010-
0.030%, N:0.0140-0.0220%, remaining is Fe and inevitable impurity.
Wherein:
C:C element is intensified element the most cost-effective in steel, but excessively high carbon content is to the plasticity and weldering of product
Connecing performance has adverse effect.The carbon content upper limit is same as HRB600 hot-rolled strip rib steel in national standard GB/T1499.2-2018 in the present invention
The C content upper limit 0.28% of muscle, comprehensively considers carbon content range being set as 0.24%-0.28%.
Si:Si is present in ferrite or austenite with being dissolved volume morphing, is had stronger solution strengthening effect, can significantly be mentioned
The intensity of Gao Gang, and price is low compared with alloying elements such as manganese, vanadium, sexual valence is relatively high, therefore the present invention sets Si content control range
Si:0.50-0.80%.
Mn:Mn is good deoxidier and desulfurizing agent and effective solution strengthening element.Meanwhile manganese is in steel
Play the role of refining pearlite.Mn content preferred scope in the present invention: 1.40-1.60%.
P, S:P, S are considered as impurity element in steel, and steel is purifying to need to be effectively reduced P, S content, but content
It is required that too low will increase steel-making cost, and therefore, P, S content range in the present invention: P≤0.040%, S≤0.040%, it is desirable that slightly
Requirement higher than national standard to screw-thread steel.
Nb:Nb and C, N have extremely strong binding force, and form corresponding extremely stable compound therewith, have refinement
Crystal grain, solution strengthening and Second Phase Precipitation invigoration effect.Nb content range in the present invention: 0.01-0.03%.
V:V is strong carbonitride-forming elements, extremely strong with the binding force of nitrogen, forms stable VN, and screw-thread steel mainly utilizes
Its precipitation strength effect, while also having thinning microstructure and solution strengthening effect.V content range in the present invention: 0.120-
0.160%.
N:N element is the element for having strong binding ability with vanadium, niobium, and suitable nitrogen can effectively play the alloys such as niobium, vanadium
The Microalloying Effect of element, but nitrogen content is excessively high all to cause adverse effect, therefore nitrogen to aging performance and welding performance
Content should control preferable in suitable range.N content range in the present invention: 0.0140-0.0220%.
The carbon equivalent of the C: Ceq≤0.58%, and Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15.
The yield strength of the reinforcing bar reaches 630MPa or more, and tensile strength reaches 800MPa grades or more, and strong flexor ratio >=
1.26, bend ratio≤1.30 in the wrong.
The rolling mill practice of above-mentioned high-strength quake-proof reinforcing steel bar, comprising the following steps:
(1) division lattice blank is prepared to according to each composition by weight percent；Each ingredient is by weight percentage, comprising: C:
0.24-0.28%, Si:0.50-0.80%, Mn:1.40-1.60%, S≤0.040%, P≤0.040%, V:0.120-
0.160%, Nb:0.010-0.030%, N:0.0140-0.0220%, remaining is Fe and inevitable impurity.
(2) prepare the steel billet for being suitble to size.
(3) it rolls, wherein 1000-1200 DEG C of billet heating temperature, 1150-1230 DEG C of soaking temperature, start rolling temperature 1100-
1200℃。
(4) upper cold bed after heating rolling, natural cooling and bundling are stacked.
In step (3), it is preferred that 1150-1180 DEG C of billet heating temperature, 1190-1220 DEG C of soaking temperature, start rolling temperature
1150-1185℃。
In step (3), controlled rolling and controlled cooling is not required in the operation of rolling.
The rolling mill practice of high tensile reinforcement of the present invention is to make full use of alloying element in heating, rolling and phase transition process
The strengthening mechanism of different existence state plays its purpose for improving the strong plasticity of product and anti-seismic performance；And pass through cost and quality
Optimal ingredient design concept, and suitable rolling mill practice is combined, produce high intensity, high-ductility and excellent anti-seismic performance
630MPa grades of hot rolled ribbed bars.
The utility model has the advantages that 1, reinforcing bar alloy system of the invention is simple, it is easy to blank smelting and is produced with Optimization of Continuous Casting, do not adopted
With precious alloys such as nickel, molybdenums, and niobium, content of vanadium are lower, and product cost of alloy is low；2, the constituent contents such as carbon, nitrogen advanced optimize,
To guarantee the low-alloy cost and excellent comprehensive performance and security performance of product；3, process of producing product do not use controlled rolling and controlled cooling and
Heat treatment, production rolling mill practice is simple, facilitates production operation, convenient for promoting, is suitble to stable mass production；4, using above-mentioned work
The high-strength steel yield strength of skill production reaches 630MPa or more, and tensile strength reaches 800MPa grades or more, and strong flexor ratio >=1.26 are bent
Ratio≤1.30 are bent, microstructure is ferrite+pearlite, meets GB/T1499.2-2018 new standard to hot rolled ribbed bars gold
The requirement of phase constitution；5, the high tensile reinforcement that the present invention develops has excellent comprehensive performance and security performance, it is ensured that emphasis work
The durability of Cheng Jianzhu and safety, popularization and application foreground are good.
Specific embodiment
Embodiment 1
The production technology of reinforcing bar includes the steps that upper cold bed is air-cooled after blank prepares, heats, rolling, rolling, rolling mill practice
Include:
Chemical component proportion, by weight percentage: C:0.25, Si:0.55, Mn:1.48%, P:0.018%, S:
0.025%, Nb:0.015, V:0.125%, N:0.0169%, Ceq:0.52%, other is Fe and inevitable impurity.On
State the Ribbed Bar of ingredient blank rolling specs φ 12mm, 150 × 150 square billet of billet bloom size used.The steel rolling of the specification reinforcing bar
Technological parameter: 1150 DEG C of billet heating temperature, 1190 DEG C of soaking temperature, 1150-1170 DEG C of start rolling temperature.Product performance index:
Rel:645MPa；Rm:820MPa, strong flexor ratio: 1.27, bend ratio 1.02 in the wrong, elongation after fracture 21.5%, maximum, force breaking elongation
(Agt): 10.2%, microstructure is pearlite+ferrite, meets requirement of the new national standard to hot rolling ribbed steel bar.
Embodiment 2
The production technology of reinforcing bar includes the steps that upper cold bed is air-cooled after blank prepares, heats, rolling, rolling, rolling mill practice
Include:
Chemical component proportion, by weight percentage: C:0.27, Si:0.65%, Mn:1.50%, P:0.021%, S:
0.023%, Nb:0.025, V:0.15%, N:0.0205%, Ceq:0.55%, other is Fe and inevitable impurity.It is above-mentioned
The Ribbed Bar of ingredient blank rolling specs φ 32mm, 150 × 150 square billet of billet bloom size used.The rolling work of the specification reinforcing bar
Skill parameter: 1180 DEG C of billet heating temperature, 1220 DEG C of soaking temperature, 1170-1185 DEG C of start rolling temperature.Product performance index:
Rel:650MPa；Rm:835MPa, strong flexor ratio: 1.28, bend ratio 1.03 in the wrong, elongation after fracture 19.5%, maximum, force breaking elongation
(Agt): 10.3%, microstructure is pearlite+ferrite, meets requirement of the new national standard to hot rolling ribbed steel bar.
Claims (6)
1. a kind of high-strength quake-proof reinforcing steel bar, which is characterized in that by weight percentage, comprising: C:0.24-0.28%, Si:0.50-
0.80%, Mn:1.40-1.60%, S≤0.040%, P≤0.040%, V:0.120-0.160%, Nb:0.010-0.030%,
N:0.0140-0.0220%, remaining is Fe and inevitable impurity.
2. high-strength quake-proof reinforcing steel bar according to claim 1, it is characterised in that: the carbon equivalent of the C: Ceq≤0.58%, and
Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15.
3. high-strength quake-proof reinforcing steel bar according to claim 1, it is characterised in that: the yield strength of the reinforcing bar reaches 630MPa
More than, tensile strength reaches 800MPa grades or more, strong flexor ratio >=1.26, bend ratio≤1.30 in the wrong, maximum, force breaking elongation (Agt) >=
10.0%.
4. a kind of rolling mill practice of high-strength quake-proof reinforcing steel bar, which comprises the following steps:
(1) prepare ingredient according to each composition by weight percent；
(2) prepare the steel billet for being suitble to size；
(3) it rolls, wherein 1000-1200 DEG C of billet heating temperature, 1150-1230 DEG C of soaking temperature, start rolling temperature 1100-1200
℃；
(4) upper cold bed after heating rolling, natural cooling and bundling are stacked.
5. rolling mill practice according to claim 4, it is characterised in that: in step (3), it is preferred that billet heating temperature
1150-1180 DEG C, 1190-1220 DEG C of soaking temperature, 1150-1185 DEG C of start rolling temperature.
6. rolling mill practice according to claim 4, it is characterised in that: in step (3), controlled rolling control is not required in the operation of rolling
It is cold.
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| CN201910768556.8A CN110453145A (en) | 2019-08-20 | 2019-08-20 | High-strength quake-proof reinforcing steel bar and rolling mill practice |
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| CN201910768556.8A CN110453145A (en) | 2019-08-20 | 2019-08-20 | High-strength quake-proof reinforcing steel bar and rolling mill practice |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111534750A (en) * | 2020-01-11 | 2020-08-14 | 武钢集团昆明钢铁股份有限公司 | Preparation method of ultra-fine grain high-strength-and-toughness HRB500E anti-seismic steel bar |
| CN111945074A (en) * | 2020-08-28 | 2020-11-17 | 安徽吾兴新材料有限公司 | 635 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof |
| CN111961962A (en) * | 2020-07-24 | 2020-11-20 | 江苏沙钢集团有限公司 | Rolling method of normalized structural steel |
| CN111979486A (en) * | 2020-08-10 | 2020-11-24 | 南京钢铁股份有限公司 | 500 Mpa-grade large-size straight-bar deformed steel bar and preparation method thereof |
| CN112210714A (en) * | 2020-09-01 | 2021-01-12 | 陕钢集团产业创新研究院有限公司 | High-strength anti-seismic reinforcing steel bar with yield strength of more than 650MPa and production method thereof |
| CN113235000A (en) * | 2021-04-29 | 2021-08-10 | 盐城市联鑫钢铁有限公司 | Phi 40mmHRB600 high-strength anti-seismic reinforcing steel bar and production method thereof |
| CN113462965A (en) * | 2021-06-18 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Steel for rolling 635 MPa-grade high-strength anti-seismic reinforcing steel bar in two-phase region and production method thereof |
| CN114836686A (en) * | 2021-06-10 | 2022-08-02 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with yield ratio more than 1.26 |
| CN114875316A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | High-strength deformed steel bar HRB600 and production method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111534750B (en) * | 2020-01-11 | 2021-08-20 | 武钢集团昆明钢铁股份有限公司 | Preparation method of ultra-fine grain high-strength-and-toughness HRB500E anti-seismic steel bar |
| CN111534750A (en) * | 2020-01-11 | 2020-08-14 | 武钢集团昆明钢铁股份有限公司 | Preparation method of ultra-fine grain high-strength-and-toughness HRB500E anti-seismic steel bar |
| CN111961962A (en) * | 2020-07-24 | 2020-11-20 | 江苏沙钢集团有限公司 | Rolling method of normalized structural steel |
| CN111979486B (en) * | 2020-08-10 | 2022-04-19 | 南京钢铁股份有限公司 | 500 Mpa-grade large-size straight-bar deformed steel bar and preparation method thereof |
| CN111979486A (en) * | 2020-08-10 | 2020-11-24 | 南京钢铁股份有限公司 | 500 Mpa-grade large-size straight-bar deformed steel bar and preparation method thereof |
| CN111945074A (en) * | 2020-08-28 | 2020-11-17 | 安徽吾兴新材料有限公司 | 635 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof |
| CN112210714A (en) * | 2020-09-01 | 2021-01-12 | 陕钢集团产业创新研究院有限公司 | High-strength anti-seismic reinforcing steel bar with yield strength of more than 650MPa and production method thereof |
| CN113235000A (en) * | 2021-04-29 | 2021-08-10 | 盐城市联鑫钢铁有限公司 | Phi 40mmHRB600 high-strength anti-seismic reinforcing steel bar and production method thereof |
| CN114836686A (en) * | 2021-06-10 | 2022-08-02 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with yield ratio more than 1.26 |
| CN114836686B (en) * | 2021-06-10 | 2022-09-13 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with strength-to-yield ratio more than 1.26 |
| CN113462965A (en) * | 2021-06-18 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Steel for rolling 635 MPa-grade high-strength anti-seismic reinforcing steel bar in two-phase region and production method thereof |
| CN114875316A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | High-strength deformed steel bar HRB600 and production method thereof |
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Application publication date: 20191115 |
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| RJ01 | Rejection of invention patent application after publication |