CN110284070A - A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method - Google Patents

A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method Download PDF

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Publication number
CN110284070A
CN110284070A CN201910697103.0A CN201910697103A CN110284070A CN 110284070 A CN110284070 A CN 110284070A CN 201910697103 A CN201910697103 A CN 201910697103A CN 110284070 A CN110284070 A CN 110284070A
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260mpa
production method
acid
hot rolling
cleaning
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CN110284070B (en
Inventor
李进
王占业
杨平
汪建威
贾幼庆
吴浩
俞波
汤亨强
何峰
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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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
    • C21D8/02—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
    • 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
    • C22C38/001—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
    • C22C38/02—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D2211/002—Bainite
    • 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)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses a kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method, the production method the following steps are included: molten iron pretreatment, converter smelting, alloy fine tuning, the refining of RH furnace, continuous casting and rolling, batch, pickling.By reasonable Design of Chemical Composition, hot rolling acid-cleaning glassed steel yield strength >=260MPa that Steelmaking, thin slab continuous casting and rolling (CSP technique), acid cleaning process are produced, tensile strength >=360MPa, elongation percentage A50>=30%, application of slip function admirable and economy is higher can satisfy the production requirement of water heater liner.

Description

A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method
Technical field
The invention belongs to hot rolling acid-cleaning glassed steel technical fields, and in particular to a kind of 260MPa rank hot rolling acid-cleaning enamel Steel and its production method.
Background technique
It cuts down cost pressure with the raising of domestic steel mill's production level and downstream user to increase, " cold with the torrid zone " is more next More paid attention to by household electric appliances.By taking water heater as an example, the ratio of the dedicated enamel steel grade hot rolling acid-cleaning plate of liner is just stepped up.
The glassed steel of steel mill, country production at present mostly uses hot rolling production method under traditional slab continuous casting process, and tradition is even The basic process of casting tandem rolling is that molten steel is casting continuously to form to the slab of 200-250mm thickness to be cooled to room temperature or hot to 600 DEG C or so hot sendings Dress, then is reheated to austenite high-temperature region, subsequently by roughing mill and mm finishing mill unit at Continuous mill train roll into broadband Steel, what steel were undergone in this technical process mutually becomes γ → α → γ → α, and slab is before the rolling, needs in heating furnace superintendent Time heating, the consumption energy is big, at high cost.
Summary of the invention
The purpose of the present invention is to provide a kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production methods, pass through conjunction The Design of Chemical Composition of reason, cooperation are related to steel-making, thin slab continuous casting and rolling (CSP technique), the acid cleaning process production of steel plate (band) Hot rolling acid-cleaning plate (band) yield strength >=260MPa out, tensile strength >=360MPa, elongation percentage A50>=30%, application of slip performance Excellent and economy is higher, can satisfy the production requirement of water heater liner.
The technical scheme adopted by the invention is as follows:
A kind of production method of 260MPa grades of hot rolling acid-cleaning glassed steel, the production method is the following steps are included: molten iron is pre- Processing, alloy fine tuning, the refining of RH furnace, continuous casting and rolling, is batched, pickling converter smelting；In casting and rolling process, steel billet before rolling Thickness control is in 65mm-90mm, to guarantee that omission pony roughing mill is directly entered the slab critical thickness of mm finishing mill unit, sheet billet Thickness it is thinner than conventional plate blank very much.
Further, in molten iron pre-treatment step: doing the place of removal impurity element to the molten iron before entering converter smelting Reason, including desiliconization of hot metal, desulfurization, dephosphorization, improve the degree of purity of molten iron.
In converter smelting step: oxidation reaction occurs for the molten iron for being blown into oxygen and high temperature, removes impurity.
In the step of alloy fine tuning station: carrying out BOTTOM ARGON BLOWING to ladle, accelerate molten steel medium motion, promote molten steel composition and temperature Degree is uniformly distributed, and the impurity of molten steel is reduced by chemically reacting, and cleans molten steel.
In RH furnace refinement step: the molten steel advantage of RH processing is obvious: alloy does not react substantially with clinker, and alloy directly adds Enter among molten steel, recovery rate is high；The mixing of molten steel energy Quick uniform；Alloying component can be controlled in it is narrow within the scope of；Gas contains Measure low, field trash is few, and Molten Steel Cleanliness is high；The temperature adjustment that chemical heating can also be carried out with top gun, provides stream for conticaster Dynamic property is good, degree of purity is high, meets the molten steel of cast temperature, in favor of the sequence casting of continuous casting.
In the continuous casting and rolling step, front spring heating and temperature control is rolled at 1100 DEG C~1300 DEG C, rolling, steel If plate temperature is lower than 1100 DEG C, there is mixed crystal in hot rolled coil interior tissue；And if temperature is higher than 1300 DEG C, in coil of strip surface Portion's tissue abnormalities are coarse and scale on surface defect is serious；For finishing temperature control at 850 DEG C~910 DEG C, finishing temperature needs height In Ar3, coil of strip is avoided mixed grain structure occur；But finishing temperature is not above 910 DEG C, the otherwise tendency of crystal grain agglomeration Property it is just stronger, obtained coil of strip crystal grain is also just coarseer.
It in the continuous casting and rolling step, is cooled down using section cooling mode, cooling water is tightly attached to belt steel surface by one Determine direction and do macroscopic motion, cooling water is constantly updated, and takes away a large amount of heat to reach cooling purpose, good cooling results.
Described to batch in step, for oiler temperature control at 600 DEG C~700 DEG C, coiling temperature can control hot-strip crystal grain The amount and form of diameter, precipitate.
In the acid pickling step, 90~150g/L of free acid concentration in pickling solution, concentration is too low, and steel plate owes pickling, surface There is residual oxidization iron sheet；Excessive concentration, the easy overpickling of surface of steel plate；70~90 DEG C of acid liquor temperature, temperature is too low, and steel plate owes acid It washes；Temperature is excessively high, and hydrochloric acid volatilization is too fast, pollutes production environment.
Further, rolling front spring heating temperature is preferably controlled in 1132 DEG C~1212 DEG C；Finishing temperature preferably controls At 881 DEG C~890 DEG C；Coiling temperature is preferably controlled in 687 DEG C~696 DEG C.
Free acid concentration preferably 105~119g/L in pickling solution；Acid liquor temperature preferably 71.4~74 DEG C of
The present invention also provides a kind of 260MPa grade hot rolling acid-cleaning enamel that production method as mentioned is prepared Steel, the 260MPa grades of hot rolling acid-cleaning glassed steel include the chemical component of following weight percent: C:0.030~0.060%, Si≤0.030%, Mn:0.30%~0.60%, P≤0.020%, S≤0.010%, Als :≤0.060%, B:0.0015~ 0.0040%, N:0.0040~0.0100%, remaining is Fe and inevitable impurity element.
Further, the 260MPa grades of hot rolling acid-cleaning glassed steel preferably comprise following weight percent chemistry at Point: C:0.032~0.040%, Si≤0.009%, Mn:0.30%~0.42%, P≤0.015%, S≤0.010%, Als: 0.035~0.051%, B:0.0017~0.0022%, N:0.0069~0.0088%, remaining for Fe and inevitably it is miscellaneous Prime element.
Alloys producing in the present invention is based primarily upon following principle:
C:C is to improve that intensity is most economical and most effective solution strengthening element, C content increase, and the pearlite of formation increases Adding, intensity increases, but the plasticity of steel and formability reduce, and C content is excessively high, during enamel firing, needle pore defect easily occurs, C percentage composition control range is 0.030~0.060%, preferably 0.032~0.040% in the present invention.
Si:Si too high levels, steel surface iron oxide scale are not easy to remove, and Si percentage composition control range is in the present invention ≤ 0.030%, preferably≤0.009%.
Mn:Mn is the effective element of weld seam Strengthening and Toughening, is conducive to deoxidation, but Mn too high levels in weld seam, slab is even Mn degree of segregation increases during casting, and all unfavorable to plasticity, welding performance, fatigue behaviour.Mn percentage composition control in the present invention Range processed is 0.30~0.60%, preferably 0.30%~0.42%.
P:P increases the cold brittleness of steel, and welding performance is made to degenerate, and reduces plasticity, cold-bending property is made to be deteriorated.P hundred in the present invention Divide content control 0.020% hereinafter, preferably≤0.015%.
S: large-sized manganese sulfide is formed, sulfide also will affect weld metal low-temperature impact toughness in steel and the application of slip is attached Performance.The control of S percentage composition is below 0.010% in the present invention.
Al:Al is able to suppress the generation of other oxides as main deoxidier, but the moulding of aluminium oxide is poor, largely Alumina inclusion can damage the processability of steel plate.The control of Al percentage composition is 0.060% hereinafter, preferably 0.035 in the present invention ~0.051%.
B:BN can obviously increase the quantity of the hydrogen trap in glassed steel at crystal boundary and phase boundary, improve enamelling sheet steel performance. B element is resourceful, cheap.Although B element plays beneficial effect in steel, in continuous casting mistake when B content is excessively high Crackle is easy to produce in journey on slab.B percentage composition control range is 0.0015~0.0040% in the present invention, preferably 0.0017~0.0022%.
N:N is solid solution element, and compound BN is beneficial for the fish scaling resistance for improving steel.If the excessively high formation of N content The amount of nitride is also high, can seriously damage the plasticity of steel.N percentage composition control range is 0.0040- in the present invention 0.0100%, preferably 0.0069~0.0088%.
The metallographic structure of the 260MPa grades of hot rolling acid-cleaning glassed steel is ferrite+pearlite+bainite, grain size etc. Grade is 9.5 grades.
Yield strength >=260MPa of the 260MPa grades of hot rolling acid-cleaning glassed steel, tensile strength >=360MPa, elongation percentage A50>=30%, for steel plate after wet-process enamelling of single side, surface does not generate fishscale.
Compared with prior art, the present invention is designed by reasonable ingredient, and the expensive conjunction of addition is avoided in ingredient Golden ingredient reduces production cost, and controls thin slab continuous casting and rolling, the parameter in pickling process, obtained 260MPa grade Suitable for the hot rolling acid-cleaning glassed steel of water heater liner, economy with higher.
Detailed description of the invention
Fig. 1 is the hot rolling glassed steel glaze layer surface in embodiment 1；
Fig. 2 is hot rolling glassed steel glaze layer surface in comparative example 3；
Fig. 3 is 100 times of metallographic structure figures of the hot rolling glassed steel in embodiment 1；
Fig. 4 is 500 times of metallographic structure figures of the hot rolling glassed steel in embodiment 1.
Specific embodiment
The chemical component, thin slab continuous casting and rolling of middle glassed steel, acid cleaning process requirement according to the present invention, have by example Body illustrates this patent.
The chemical component (mass percent) of examples and comparative examples of the present invention is shown in Table 1, remaining is for Fe and unavoidably Impurity element: embodiment 1/2/3/4 uses CSP technique, and ingredient meets design value of the present invention；Comparative example uses CSP technique, C, Mn content are relatively low in the steel-making of comparative example 1/2, do not carry out blowing N technique in the steel-making of comparative example 3/4 and do not add B element.
1 embodiment chemical component of table, wt%
Important technical parameter control in embodiment and comparative example production process is shown in Table 2
2 processing parameter of table
Embodiment and the mechanical property of comparative example are shown in Table 3 in the present invention: the mechanics of embodiment 1/2/3/4 and comparative example 3/4 Performance meets the requirements；1/2 mechanical property of comparative example is relatively low, undesirable.
3 product mechanical property of table
Using enameling process of wet process single side, natural cooling after 860 DEG C of heat preservation 10min places for 24 hours, the results are shown in Table 4: Embodiment 1/2/3/4 and 1/2 glaze layer surface of comparative example are quick-fried without squama, and 3/4 glaze layer surface part squama of comparative example is quick-fried.
4 application of slip firing process and performance evaluation
From examples detailed above as can be seen that yield strength >=260MPa of present invention steel plate (band) mechanical property produced, Tensile strength >=360MPa, elongation percentage A50>=30%, it can satisfy water heater liner and armor plate strength and forming property wanted It asks, after the application of slip of single side wet process, application of slip function admirable and economy is higher.
It is above-mentioned to be retouched in detail referring to embodiment to what a kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method carried out It states, is illustrative without being restrictive, several embodiments can be enumerated according to limited range, therefore do not departing from Change and modification under present general inventive concept should belong within protection scope of the present invention.

Claims (10)

1. a kind of production method of 260MPa grades of hot rolling acid-cleaning glassed steel, which is characterized in that the production method includes following step Rapid: molten iron pretreatment, alloy fine tuning, the refining of RH furnace, continuous casting and rolling, is batched, pickling converter smelting；In casting and rolling process, roll Steel billet thickness control is in 65mm-90mm before making.
2. production method according to claim 1, which is characterized in that in the continuous casting and rolling step, rolling front spring adds Hot temperature control is at 1100 DEG C~1300 DEG C；Finishing temperature control is at 850 DEG C~910 DEG C.
3. production method according to claim 1, which is characterized in that in the continuous casting and rolling step, using section cooling Mode is cooled down.
4. production method according to claim 1, which is characterized in that described to batch in step, oiler temperature control is 600 DEG C~700 DEG C.
5. production method according to claim 1, which is characterized in that in the acid pickling step, free acid is dense in pickling solution Spend 90~150g/L；70~90 DEG C of acid liquor temperature.
6. production method described in -5 any one according to claim 1, which is characterized in that rolling front spring heating and temperature control At 1132 DEG C~1212 DEG C；Finishing temperature control is at 881 DEG C~890 DEG C；Oiler temperature control is at 687 DEG C~696 DEG C.
7. production method described in -5 any one according to claim 1, which is characterized in that free acid concentration 105 in pickling solution ~119g/L；71.4~74 DEG C of acid liquor temperature.
8. a kind of 260MPa grade hot rolling acid-cleaning enamel that the production method as described in claim 1-7 any one is prepared Steel, which is characterized in that the 260MPa grades of hot rolling acid-cleaning glassed steel includes the chemical component of following weight percent: C:0.030 ~0.060%, Si≤0.030%, Mn:0.30%~0.60%, P≤0.020%, S≤0.010%, Als :≤0.060%, B:0.0015~0.0040%, N:0.0040~0.0100%, remaining is Fe and inevitable impurity element.
9. 260MPa grades of hot rolling acid-cleaning glassed steel according to claim 8, which is characterized in that the 260MPa grades of hot rolling The metallographic structure of pickling glassed steel is ferrite+pearlite+bainite, and grain size number is 9.5 grades.
10. 260MPa grades of hot rolling acid-cleaning glassed steel according to claim 8, which is characterized in that the 260MPa grades of hot rolling Yield strength >=260MPa of pickling glassed steel, tensile strength >=360MPa, elongation percentage A50>=30%, steel plate is once wet through single side After the method application of slip, surface does not generate fishscale.
CN201910697103.0A 2019-07-30 2019-07-30 260 MPa-level hot-rolled acid-washed enamel steel and production method thereof Active CN110284070B (en)

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CN110747323A (en) * 2019-10-24 2020-02-04 马鞍山钢铁股份有限公司 Acid-washing cold-formed steel and manufacturing method thereof
CN111014603A (en) * 2019-12-30 2020-04-17 江苏沙钢集团有限公司 Double-roller casting-rolling production method of boron-added steel
CN111455273A (en) * 2020-04-07 2020-07-28 新余钢铁股份有限公司 Base plate for compressor shell and production method thereof
CN112501513A (en) * 2020-11-30 2021-03-16 日照宝华新材料有限公司 Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof
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Cited By (10)

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Publication number Priority date Publication date Assignee Title
CN110747323A (en) * 2019-10-24 2020-02-04 马鞍山钢铁股份有限公司 Acid-washing cold-formed steel and manufacturing method thereof
CN111014603A (en) * 2019-12-30 2020-04-17 江苏沙钢集团有限公司 Double-roller casting-rolling production method of boron-added steel
WO2021136336A1 (en) * 2019-12-30 2021-07-08 Jiangsu Shagang Group Co., Ltd. Method for producing boron-added steel based on twin-roll strip casting
CN111455273A (en) * 2020-04-07 2020-07-28 新余钢铁股份有限公司 Base plate for compressor shell and production method thereof
CN112501513A (en) * 2020-11-30 2021-03-16 日照宝华新材料有限公司 Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof
CN112501513B (en) * 2020-11-30 2022-05-13 日照宝华新材料有限公司 Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof
CN113042563A (en) * 2021-03-17 2021-06-29 包头钢铁（集团）有限责任公司 Manufacturing method of SPHE hot-rolled pickled plate for stamping
CN113198851A (en) * 2021-03-18 2021-08-03 日照钢铁控股集团有限公司 Production method of hot-rolled pickled sheet of enamel steel
CN115537664A (en) * 2022-10-13 2022-12-30 马鞍山钢铁股份有限公司 Hot-rolled acid-pickling steel for enameling with yield strength of more than or equal to 300MPa after enameling and production method thereof
CN115537664B (en) * 2022-10-13 2023-05-30 马鞍山钢铁股份有限公司 Hot-rolled pickled enamel steel with yield strength more than or equal to 300MPa after enameling and production method thereof

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