CN109576583A - 500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method - Google Patents

500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method Download PDF

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Publication number
CN109576583A
CN109576583A CN201811549695.3A CN201811549695A CN109576583A CN 109576583 A CN109576583 A CN 109576583A CN 201811549695 A CN201811549695 A CN 201811549695A CN 109576583 A CN109576583 A CN 109576583A
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China
Prior art keywords
reinforcing bar
high nitrogen
continuous casting
combined microalloying
nitrogen combined
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CN201811549695.3A
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Chinese (zh)
Inventor
孙彩凤
孙江波
徐斌
张洪春
冯忠贤
高建
任刚
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Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
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Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
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Priority to CN201811549695.3A priority Critical patent/CN109576583A/en
Publication of CN109576583A publication Critical patent/CN109576583A/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • C22C38/001—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
    • C22C38/002—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
    • C22C38/04—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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

500MPa grades of high nitrogen combined microalloying reinforcing bar of the present invention and its production method, the mass percentage of its chemical component is respectively as follows: C:0.18~0.25, Si:0.40~0.80, Mn:1.30~1.60, P≤0.045, S≤0.045, V:0.020~0.040, Nb:0.010~0.040, Ti:0.010~0.040, N:0.0090~0.0150, remaining is iron and inevitable impurity element；In production method, after the completion of continuous casting working procedure, continuous casting billet is heated to 1130~1250 DEG C and keeps the temperature 90~150 minutes again, 1020~1120 DEG C are cooled to later to be rolled, water cooling is carried out after rolling, 0.1~0.5Mpa of hydraulic pressure controls 920~1010 DEG C of temperature on cooling table, reinforcing bar enters natural cooling after cold bed, and high nitrogen combined microalloying reinforcing bar is made.The invention can ensure that steel bar mechanics performance meets national standard, production cost is low and simple production process is easy.

Description

500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method
Technical field
The present invention relates to a kind of reinforcing bar and its production method more particularly to a kind of 500MPa grades of high nitrogen combined microalloying steel Muscle and its production method.
Background technique
Reinforcing bar be most widely used, the steel grade of technology maturation, almost all of iron and steel enterprise can produce.With 2018 The formulation and implementation of year new national standard " concrete reinforcement steel-GB/T1499.2 ", since standard requirements steel area periphery does not permit Perhaps occur being different from the ring of internal contrast, therefore limiting the production for wearing water reinforcing bar to a certain degree, each steel mill largely starts to adopt It is produced with traditional vanadium microalloy technology；Meanwhile with the reinforcement of national environmental protection renovation dynamics, vanadium alloy resource provisioning is nervous, more Aspect reason makes vanadium alloy price rise sharply, and traditional vanadium iron or v n micro alloying technique reinforcing bar production cost is caused to mention significantly It is high.
To reduce production cost, the micro alloying element that 500Mpa grades of reinforcing bar factories mainly use at present is V, V-N, V- Nb is compound, V-Ti is compound, and wherein content of vanadium is higher causes production cost high；Patent publication No. CN102703813 A's Patent application discloses a kind of " vanadium titanium-combined microalloying reinforcing bar and its production method ", and it is main to be directed to 500Mpa grades of reinforcing bars Using vanadium titanium-combined microalloying, although content of vanadium is lower in its ingredient, production cost is reduced to a certain extent, titanium contains More a height of 0.05~0.12wt% is measured, high Ti content causes the precipitation of TiN particle coarse, cannot play pinning austenite grain boundary Effect and so that pourability of molten steel is deteriorated, be easy to cause production accident, in addition, it is 800~860 DEG C that finishing temperature is relatively low, one As milling train be difficult to meet process conditions requirement, production difficulty is big.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of 500MPa grades of high nitrogen combined microalloying reinforcing bar and its lifes Production method by adding a small amount of vanadium, niobium, titanium and suitable nitrogen, and formulates reasonable heating, cooling technique, it is ensured that Steel bar mechanics performance meets national standard, and production cost is low and simple production process is easy.
Solve the technical solution of above-mentioned technical problem are as follows:
500MPa grades of high nitrogen combined microalloying reinforcing bars, the mass percentage of chemical component are respectively as follows: C:0.18~0.25, Si:0.40~0.80, Mn:1.30~1.60, P≤0.045, S≤0.045, V:0.020~0.040, Nb:0.010~0.040, Ti:0.010~0.040, N:0.0090~0.0150, remaining is iron and inevitable impurity element.
Above-mentioned 400Mpa grade high nitrogen combined microalloying reinforcing bar, the mass percentage of chemical component are preferred are as follows: C: 0.20~0.25, Si:0.40~0.60, Mn:1.40~1.60, P≤0.035, S≤0.035, V:0.020~0.035, Nb: 0.010~0.035, Ti:0.010~0.035, N:0.0090~0.0150.
The production technology of above-mentioned 500Mpa grade high nitrogen combined microalloying reinforcing bar, including steel making working procedure, refining procedure, company Foundry work sequence, heating process and rolling process, the chemical component mass percentage of continuous casting billet made of the continuous casting working procedure are as follows: C: 0.18~0.25；Si:0.40~0.80；Mn:1.30~1.60；P≤0.045；S≤0.045；V:0.020~0.040, preferably 0.020~0.035；Nb:0.010~0.040, preferably 0.010~0.035；Ti:0.010~0.040, preferably 0.010~ 0.035；N:0.0090~0.0150, remaining is iron and inevitable impurity element；
The production technology of above-mentioned 500Mpa grade high nitrogen combined microalloying reinforcing bar, after the completion of the continuous casting working procedure, by continuous casting billet It is heated to 1130~1250 DEG C and keeps the temperature 90~150 minutes again, be cooled to 1020~1120 DEG C later and rolled, roll laggard Row water cooling, 0.1~0.5Mpa of hydraulic pressure control 920~1010 DEG C of temperature on cooling table, and reinforcing bar enters natural cooling after cold bed, and height is made Nitrogen combined microalloying reinforcing bar.
The production technology of above-mentioned 500Mpa grade high nitrogen combined microalloying reinforcing bar, the steel making working procedure tapping process use Ferro-niobium, ferrovanadium nitride deoxidation alloying；
The refining procedure, molten steel are sent into refining furnace and carry out refining and trimming, carry out after so that it is met reinforcing bar component requirements Casting, obtains rolling concrete steel bar continuous casting billet.
Theory analysis of the present component with when technique adjustment is as follows:
Carbon of the invention, silicon, manganese content and the 500Mpa grade reinforcing bar in the prior art containing vanadium are substantially suitable, phosphorus, thia prime element Requirement it is also suitable.Present invention employs the vanadium of lower content, niobium and titanium, suitable nitrogen enhances strengthening effect, thus into one Step reduces cost.Effect of the vanadium in reinforcing bar is mainly precipitation strength, if suitable nitrogen is added, nitrogen can increase carbon nitridation The nuclear driving force of vanadium, the volume fraction for causing vanadium carbide nitride to be precipitated increases, to can further improve precipitating reinforcing effect；Niobium Effect in reinforcing bar is mainly crystal grain refinement, precipitation strength and phase transformation strengthening；Although niobium plays crystal grain refinement in steel, is precipitated The effect of reinforcing, but additive amount is more, and under high temperature heating conditions, solid solution niobium is more, and stabilization of austenite enhancing further mentions The high harden ability of steel, is easy to generate a large amount of bainite low temperature phase change product, so that reinforcing bar is easy to cause yield point occur not Obvious phenomenon, therefore the present invention is added to a small amount of niobium element.Effect of the titanium in reinforcing bar is mainly crystal grain refinement and is precipitated strong Change, add a small amount of titanium elements and suitable nitrogen, highly stable small and dispersed distribution can be formed under the high temperature conditions TiN, reheating before hot-working during, inhibit the crystal grain of austenite to grow up, can be higher compared with the steel of not titaniferous It is rolled under heating temperature, reduces mill load, be conducive to improve production efficiency.
The invention has the benefit that
Compared with prior art, the present invention adds vanadium, niobium, a small amount of titanium and fits by using high nitrogen combined microalloying technique The nitrogen of amount, pourability of molten steel are good；It can guarantee reinforcement yielding intensity 530- by reasonable heating process, cooling technique 580Mpa, tensile strength 680-740Mpa, strong flexor ratio 1.27-1.33, Stretching 11-18% meet standard requirements, and iron Ferritic adds pearlitic structrure content >=95%, and stress strain curve has obvious yield point elongation, can substantially reduce the usage amount of expensive vanadium, Significantly reduce production cost；In addition, can roll at high temperature, mill load is smaller, lower to milling equipment Capability Requirement, is suitble to Stablize and produces in enormous quantities.
Specific embodiment
Below by Examples 1 to 10, the present invention will be further described.
Examples 1 to 10 uses ferro-niobium, ferrovanadium nitride deoxidation alloying in tapping process, and the molten steel after tapping is sent into refining Furnace specifies element and content to carry out refining and trimming, is cast into 150mm square billet after meeting reinforcing bar component requirements by table 1；
1 chemical component table of table
150 square billets control 1130~1250 DEG C of heating temperature by bar heating furnace, then keep the temperature 90~150 minutes, cool down later It is rolled to 1020~1120 DEG C, water cooling is carried out after rolling, 0.1~0.5Mpa of hydraulic pressure controls temperature on cooling table 920~1010 DEG C, reinforcing bar enters natural cooling after cold bed, then shearing, bundling, storage；Its technological parameter and performance are shown in Table 2；
2 rolling mill practice of table and mechanical property
The measurement that embodiment 1, embodiment 4, embodiment 7 and embodiment 10 carry out each phase constitution occupied area ratio is had chosen, is used Division lines method measures reinforcing bar sample tissue relative quantity, and under 100 power microscopes, measurement is no less than 50 visual fields；Reinforcing bar sample Tissue relative quantity is shown in Table 3.
Each Phase Proportion of 3 metallographic structure of table
Reinforcement property listed by Examples 1 to 10 fully meets national standard, in metallographic structure ferrite+content of pearlite in alloy be greater than etc. In 95%, ingredient is uniform, performance is stable；Simultaneously using a small amount of vanadium, niobium, few titanium and suitable nitrogen, production can be significantly reduced Cost.

Claims (5)

1.500MPa grades of high nitrogen combined microalloying reinforcing bars, it is characterised in that: the mass percentage of the reinforcing bar chemical component It is respectively as follows: C:0.18~0.25, Si:0.40~0.80, Mn:1.30~1.60, P≤0.045, S≤0.045, V:0.020~ 0.040, Nb:0.010~0.040, Ti:0.010~0.040, N:0.0090~0.0150, remaining for iron and inevitably it is miscellaneous Prime element.
2. 400Mpa grades of high nitrogen combined microalloying reinforcing bar as described in claim 1, it is characterised in that: the reinforcing bar chemistry at The mass percentage divided is preferred are as follows: and C:0.20~0.25, Si:0.40~0.60, Mn:1.40~1.60, P≤0.035, S≤ 0.035, V:0.020~0.035, Nb:0.010~0.035, Ti:0.010~0.035, N:0.0090~0.0150.
The production technology of 3.500Mpa grades of high nitrogen combined microalloying reinforcing bars, including steel making working procedure, refining procedure, continuous casting working procedure, Heating process and rolling process, it is characterised in that: the chemical component mass percentage of continuous casting billet made of the continuous casting working procedure Are as follows: C:0.18~0.25；Si:0.40~0.80；Mn:1.30~1.60；P≤0.045；S≤0.045；V:0.020~0.040, It is preferred that 0.020~0.035；Nb:0.010~0.040, preferably 0.010~0.035；Ti:0.010~0.040, preferably 0.010~ 0.035；N:0.0090~0.0150, remaining is iron and inevitable impurity element.
4. the production technology of 500Mpa grades of high nitrogen combined microalloying reinforcing bar as claimed in claim 3, it is characterised in that: described After the completion of continuous casting working procedure, continuous casting billet is heated to 1130~1250 DEG C and keeps the temperature 90~150 minutes again, it is cooled to 1020 later~ 1120 DEG C are rolled, and water cooling is carried out after rolling, and 0.1~0.5Mpa of hydraulic pressure controls 920~1010 DEG C of temperature on cooling table, reinforcing bar Enter natural cooling after cold bed, high nitrogen combined microalloying reinforcing bar is made.
5. the production technology of 500Mpa grades of high nitrogen combined microalloying reinforcing bar as claimed in claim 3, it is characterised in that: described Steel making working procedure tapping process uses ferro-niobium, ferrovanadium nitride deoxidation alloying；
The refining procedure, molten steel are sent into refining furnace and carry out refining and trimming, carry out after so that it is met reinforcing bar component requirements Casting, obtains rolling concrete steel bar continuous casting billet.
CN201811549695.3A 2018-12-18 2018-12-18 500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method Withdrawn CN109576583A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110029271A (en) * 2019-04-09 2019-07-19 东北大学 A kind of 500MPa grade niobium-containing spiral and its manufacturing method
CN110079728A (en) * 2019-04-09 2019-08-02 东北大学 A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method
CN110951953A (en) * 2019-12-20 2020-04-03 福建三宝钢铁有限公司 HRB500E steel bar and vanadium-nitrogen microalloying process thereof
CN111286674A (en) * 2020-03-31 2020-06-16 湖南华菱湘潭钢铁有限公司 Production method of high-strength anchor rod reinforcing steel bar
CN111500937A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 460 MPa-level bridge channel steel and production method thereof
CN111500938A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 Channel steel with yield strength of 420MPa for bridge and production method
CN116254469A (en) * 2021-06-10 2023-06-13 广西柳钢华创科技研发有限公司 HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28

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JP2006089785A (en) * 2004-09-22 2006-04-06 Jfe Bars & Shapes Corp High-strength steel with excellent toughness for stabilizer, and method for manufacturing stabilizer
CN101423915A (en) * 2008-12-11 2009-05-06 中国钢研科技集团公司 Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same
CN102703812B (en) * 2012-06-27 2013-12-25 攀枝花钢城集团有限公司 Titanium microalloyed 500-MPa high-strength steel bar and production method thereof
CN105088074A (en) * 2015-09-07 2015-11-25 江苏天舜金属材料集团有限公司 High-strength steel bar and method for controlling minimum reinforcement ratio of concrete plate flexural member through high-strength steel bars
CN107815604A (en) * 2017-11-30 2018-03-20 攀钢集团攀枝花钢铁研究院有限公司 Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy
CN107955910A (en) * 2017-11-30 2018-04-24 攀钢集团攀枝花钢铁研究院有限公司 Steel bar and its LF stove production methods are built containing V, Nb, Ti microalloy
CN107955904A (en) * 2017-11-30 2018-04-24 攀钢集团攀枝花钢铁研究院有限公司 Steel bar and its production method are built containing V, Nb, Ti microalloy

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Publication number Priority date Publication date Assignee Title
JP2006089785A (en) * 2004-09-22 2006-04-06 Jfe Bars & Shapes Corp High-strength steel with excellent toughness for stabilizer, and method for manufacturing stabilizer
CN101423915A (en) * 2008-12-11 2009-05-06 中国钢研科技集团公司 Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same
CN102703812B (en) * 2012-06-27 2013-12-25 攀枝花钢城集团有限公司 Titanium microalloyed 500-MPa high-strength steel bar and production method thereof
CN105088074A (en) * 2015-09-07 2015-11-25 江苏天舜金属材料集团有限公司 High-strength steel bar and method for controlling minimum reinforcement ratio of concrete plate flexural member through high-strength steel bars
CN107815604A (en) * 2017-11-30 2018-03-20 攀钢集团攀枝花钢铁研究院有限公司 Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy
CN107955910A (en) * 2017-11-30 2018-04-24 攀钢集团攀枝花钢铁研究院有限公司 Steel bar and its LF stove production methods are built containing V, Nb, Ti microalloy
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110029271A (en) * 2019-04-09 2019-07-19 东北大学 A kind of 500MPa grade niobium-containing spiral and its manufacturing method
CN110079728A (en) * 2019-04-09 2019-08-02 东北大学 A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method
WO2020206743A1 (en) * 2019-04-09 2020-10-15 东北大学 500 mpa niobium-containing ribbed reinforcing bar and manufacturing method therefor
CN110951953A (en) * 2019-12-20 2020-04-03 福建三宝钢铁有限公司 HRB500E steel bar and vanadium-nitrogen microalloying process thereof
CN111286674A (en) * 2020-03-31 2020-06-16 湖南华菱湘潭钢铁有限公司 Production method of high-strength anchor rod reinforcing steel bar
CN111500937A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 460 MPa-level bridge channel steel and production method thereof
CN111500938A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 Channel steel with yield strength of 420MPa for bridge and production method
CN116254469A (en) * 2021-06-10 2023-06-13 广西柳钢华创科技研发有限公司 HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28
CN116254469B (en) * 2021-06-10 2024-06-11 广西柳钢华创科技研发有限公司 HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28

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Application publication date: 20190405