CN110129672A - A kind of low cost 750MPa intensity rank structural carbon steel and production method - Google Patents

A kind of low cost 750MPa intensity rank structural carbon steel and production method Download PDF

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Publication number
CN110129672A
CN110129672A CN201910402957.1A CN201910402957A CN110129672A CN 110129672 A CN110129672 A CN 110129672A CN 201910402957 A CN201910402957 A CN 201910402957A CN 110129672 A CN110129672 A CN 110129672A
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CN
China
Prior art keywords
750mpa
carbon steel
low cost
intensity rank
temperature
Prior art date
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Pending
Application number
CN201910402957.1A
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Chinese (zh)
Inventor
张吉富
杨玉
何士国
乔磊
黄士博
冯艳斌
刘旺臣
王杰
王存
徐立家
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN201910402957.1A priority Critical patent/CN110129672A/en
Publication of CN110129672A publication Critical patent/CN110129672A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • 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

Abstract

A kind of low cost 750MPa intensity rank structural carbon steel and production method, its chemical component is by mass percentage are as follows: C:0.46%~0.50%, Si:0.17%~0.37%, Mn:0.55%~0.80%, P≤0.025%, S≤0.015%, surplus are Fe and inevitable impurity.Heating process time inside furnace 175~240 minutes, 1200~1240 DEG C of tapping temperature, 1000~1050 DEG C of roughing outlet temperature, 850~890 DEG C of finishing temperature, 550~590 DEG C of coiling temperature, 48~50mm of workpiece thickness.The present invention, by zerolling, controls reduction ratio it is not necessary that the microalloy elements such as Nb, V, Ti are added, and is manufactured tensile strength with low common 45 slab using method for rapid cooling and reaches 750MPa hot rolled steel plate, saved quenching process.

Description

A kind of low cost 750MPa intensity rank structural carbon steel and production method
Technical field
The invention belongs to hot-rolled sheet strip steel field more particularly to a kind of low cost 750MPa intensity rank structural carbon steel and Production method.
Background technique
In recent years, with the development of hot rolled strip technology and being growing more intense for market competition, high-intensitive environmentally protective hot rolling Product is increasingly becoming an important developing direction.For quality carbon structural steel 45, national standard " high-quality carbon knot Structure steel hot rolling thick steel plate and steel band " GB/T 711-2008 clearly states: tensile strength reaches 600MPa, elongation percentage after heat treatment Reach 17%.Anshan iron and steel plant, it is demonstrated experimentally that under conditions of not increasing cost of alloy, passes through the rolling temperature of reduction by 45 through undergone mass production Degree, improves cooling velocity and controlled rolling workpiece thickness can increase substantially its tensile strength.Described in the art of this patent Production method can make 45 tensile strength reach 750MPa.After this patent is implemented, high-strength hot-rolled carbon constructional quality steel is reduced The production cost of plate further adapts to the flexibility in market, preferably meets user demand, improve the production efficiency and warp of enterprise Ji benefit.
Summary of the invention
The present invention provides a kind of low cost 750MPa intensity rank structural carbon steel and production methods, are not increasing alloy The rolled tensile strength of quality carbon structural steel 45 is increased to 750MPa or more under conditions of cost, realizes intensity liter Grade reduces client and quenches cost.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of low cost 750MPa intensity rank structural carbon steel, chemical component is by mass percentage are as follows: C: 0.46%~0.50%, Si:0.17%~0.37%, Mn:0.55%~0.80%, impurity element P≤0.025%, S≤ 0.015%, surplus is Fe and inevitable impurity.
The tissue of the 750MPa intensity rank structural carbon steel is thin ferrite+pearlite, and content of pearlite in alloy is greater than 80%.
A kind of production method of low cost 750MPa intensity rank structural carbon steel, steel billet is by converter smelting, external refining And continuous casting forms；Heating process time inside furnace 175~240 minutes, 1200~1240 DEG C of tapping temperature, operation of rolling roughing 1000~1050 DEG C of outlet temperature, 850~890 DEG C of finishing temperature, 550~590 DEG C of coiling temperature, workpiece thickness 48~ 50mm, layer is cold cooling using leading portion, batches rear air-cooled.
Each alloying component mechanism of action of high-quality carbon structural steel of the invention detailed below, wherein percentage symbol % Representation quality percentage fractional:
C:0.46%~0.50%
C is main solution strengthening element in steel.If C content is lower than 0.46%, it is difficult to ensure that the high intensity of steel, another If aspect C content is higher than 0.50%, deteriorate the toughness of steel and beyond 45 composition ranges.Therefore, C content will control 0.46%~0.50%.
Mn:0.55%~0.80%
Mn is good deoxidier and desulfurizing agent, is the essential elements for guaranteeing the intensity and toughness of steel, and manganese and iron form solid Solution can improve the hardness and strength of ferrite and austenite in steel；It is again simultaneously carbide former, into cementite Replace a part of iron atom.Manganese, due to reducing critical transition temperature, plays the role of refining pearlite in steel.Mn is in conjunction with S MnS is formed, avoids grain boundaries from forming fire check caused by FeS, while Mn is also good deoxidier and increases harden ability.Mn The too low requirement for not being able to satisfy high intensity levels steel plate of content, Mn too high levels then increase low-intensity rank Plate Production cost, Therefore, the factors such as considering cost and performance requirement, Mn content should be controlled 0.55%~0.80%.
Si:0.17%~0.37%
Si is one of common elements in steel, and reducing agent and deoxidier are used as in steelmaking process, and the Si for being dissolved form can be mentioned High-yield strength and ductile-brittle transition temperature, if but being more than that upper content limit will reduce toughness and welding performance.Therefore 0.17%~ 0.37% Si, which is retained in steel, to be necessary.
P :≤0.025%, S :≤0.015%
P and S is inevitable objectionable impurities in steel, the toughness of their presence meeting severe exacerbation steel, therefore to be adopted Measure is taken to reduce P the and S content in steel as far as possible.According to the present invention, highest P content is limited in 0.025%, highest S content It is limited in 0.015%.
Compared with prior art, the beneficial effects of the present invention are:
After taking above-mentioned measure, it is not necessary that the microalloy elements such as Nb, V, Ti are added, by zerolling, reduction ratio are controlled, is adopted The hot rolled steel plate that tensile strength reaches 750MPa is produced, can be saved with common 45 slab of low cost with method for rapid cooling Client's quenching process is gone, meets the needs of client is to low-cost high-strength carbon constructional quality steel, while reducing high-strength hot Roll the production cost of carbon constructional quality steel.
Detailed description of the invention
Fig. 1 is the product crystalline phase figure of embodiment 1,5.0mm (500 times) Rm=826N/mm2。
Fig. 2 is the product crystalline phase figure of embodiment 2,4.0mm (500 times) Rm=896N/mm2。
Specific embodiment
Below with reference to embodiment, specific embodiments of the present invention will be further explained:
The present invention relates to the producers for the low-cost high-strength quality carbon structural steel that thickness specification is 4mm~5mm Method.In particular to common 45 slab, the hot rolled steel plate that tensile strength reaches 750MPa is produced by controlled cooling technique.
A kind of low cost 750MPa intensity rank structural carbon steel, chemical component is by mass percentage are as follows: C: 0.46%~0.50%, Si:0.17%~0.37%, Mn:0.55%~0.80%, impurity element P≤0.025%, S≤ 0.015%, surplus is Fe and inevitable impurity.
The tissue of the 750MPa intensity rank structural carbon steel is thin ferrite+pearlite, and content of pearlite in alloy is greater than 80%.
A kind of production method of low cost 750MPa intensity rank structural carbon steel, steel billet is by converter smelting, external refining And continuous casting forms；Heating process time inside furnace 175~240 minutes, 1200~1240 DEG C of tapping temperature, operation of rolling roughing 1000~1050 DEG C of outlet temperature, 850~890 DEG C of finishing temperature, 550~590 DEG C of coiling temperature, workpiece thickness 48~ 50mm, layer is cold cooling using leading portion, batches rear air-cooled.
Increase workpiece thickness in the operation of rolling, and then increase finish rolling stage accumulation drafts, improves ferrite and pearly-lustre Body nucleation rate achievees the purpose that refine crystal grain；To inhibit crystal grain to grow up, the coiling speed after Ying Tigao finish to gauge keeps strip quick It is cooled to lower temperature to be batched, coiling temperature is 550~590 DEG C；Section cooling takes leading portion rapid cooling (laminar flow the first or the Two groups of cooling manifold groups start continuous coo1ing) the type of cooling.The cooling velocity of laminar flow water cooling requires to be shown in Table 1.
Table 1:
Thickness range (mm) 3.5≤thickness < 4.1 4.1≤thickness < 5.1 5.1≤thickness < 7.1
Laminar flow of water speed of cooling DEG C/s ≥45 ≥31 ≥22
It is thin ferrite+pearlite by above-mentioned batch with the 750MPa carbon constructional quality steel tissue of cooling technique production, Content of pearlite in alloy is greater than 80%, much higher than 45 content of pearlite in alloy of equilibrium state.
Coiling temperature and cooling velocity directly affect the structure property of product, and coiling temperature is low, and cooling velocity is fast, when phase transformation Degree of supercooling increases, and nucleation rate improves, fetrite grain refinement, meanwhile, content of pearlite in alloy increases, and improves intensity.Further promoted Product strength grade.
Embodiment is shown in Table 2；
Table 2: produced on-site example

Claims (3)

1. a kind of low cost 750MPa intensity rank structural carbon steel, which is characterized in that its chemical component is by mass percentage Are as follows: C:0.46%~0.50%, Si:0.17%~0.37%, Mn:0.55%~0.80%, impurity element P≤0.025%, S ≤ 0.015%, surplus is Fe and inevitable impurity.
2. a kind of low cost 750MPa intensity rank structural carbon steel according to claim 1, which is characterized in that described The tissue of 750MPa intensity rank structural carbon steel is thin ferrite+pearlite, and content of pearlite in alloy is greater than 80%.
3. a kind of production method of low cost 750MPa intensity rank structural carbon steel as claimed in claim 1 or 2, feature It is, steel billet is formed by converter smelting, external refining and continuous casting；Heating process time inside furnace 175~240 minutes, tapping 1200~1240 DEG C of temperature, 1000~1050 DEG C of operation of rolling roughing outlet temperature, 850~890 DEG C of finishing temperature, coiling temperature 550~590 DEG C, 48~50mm of workpiece thickness, layer is cold cooling using leading portion, batches rear air-cooled.
CN201910402957.1A 2019-05-15 2019-05-15 A kind of low cost 750MPa intensity rank structural carbon steel and production method Pending CN110129672A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113578963A (en) * 2021-07-30 2021-11-02 日照钢铁控股集团有限公司 Method for producing thin 45 steel by continuous casting and rolling production line

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113578963A (en) * 2021-07-30 2021-11-02 日照钢铁控股集团有限公司 Method for producing thin 45 steel by continuous casting and rolling production line

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