CN113832392A - Cold-rolled steel plate for enamel and production method thereof - Google Patents

Cold-rolled steel plate for enamel and production method thereof Download PDF

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CN113832392A
CN113832392A CN202110883175.1A CN202110883175A CN113832392A CN 113832392 A CN113832392 A CN 113832392A CN 202110883175 A CN202110883175 A CN 202110883175A CN 113832392 A CN113832392 A CN 113832392A
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rolling
less
cold
temperature
rolled steel
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杨海西
王少博
曹晓运
樊利智
孙志丽
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Jingye Steel Co Ltd
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Jingye Steel Co Ltd
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
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    • C21D6/00—Heat treatment of ferrous alloys
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    • C21D6/00—Heat treatment of ferrous alloys
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    • 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
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    • 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
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    • 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
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    • 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
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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    • 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
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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    • 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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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The cold rolled steel plate for enamel has the microstructure of ferrite, pearlite and C or N containing precipitate, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.

Description

Cold-rolled steel plate for enamel and production method thereof
Technical Field
The invention relates to the technical field of steel smelting, in particular to a cold-rolled steel plate for enamel and a production method thereof.
Background
The enameled pressed steel has the characteristics of cleanness, tidiness, safety, no toxicity, rust prevention and the like after being enameled, can be used in many places in daily life, such as diet appliances, washing appliances and the like, and is obviously low in production cost compared with common practical SUS304 stainless steel. In fact, the enameled steel plate also has the characteristics of high hardness, high temperature resistance, wear resistance and insulation, and is widely applied to industrial production, such as industries of light industry, household appliances, chemical industry, buildings and the like. The scale explosion is the most terrible defect of the enameled steel sheet, and is generally considered to be the reaction of crystal water in the enamel slurry with iron and carbon on the surface of the steel sheet to generate atomic hydrogen during high-temperature enameling. When the steel sheet is cooled, the solubility of hydrogen in the steel is rapidly reduced, and if there is not enough hydrogen storage space in the steel sheet, a large number of hydrogen atoms are released, and the surface area of the steel sheet is accumulated to a certain level, and then the steel sheet is flaked. The scale-explosion resistance of the steel plate is generally influenced by artificially introducing hydrogen traps.
At present, domestic research on enamel steel is not abundant. There are concerns about the fishscale resistance, adherence and pinhole resistance, for example CN109943779A states that "C: 0.010-0.030 percent of Si, less than or equal to 0.030 percent of Si, Mn: 0.12-0.40%, P is less than or equal to 0.015%, S: 0.010% -0.030%, Als: 0.010-0.060%, Ti: 0.010% -0.040%, N: 0.0010 to 0.0070 percent, and the balance of Fe and inevitable impurities, and the low-carbon cold-rolled steel plate for enamel with yield strength of about 270MPa is produced. Some attention is paid to deep drawing forming capability, for example, CN107326268A describes an economical deep drawing cold rolling enamel steel, which comprises the following chemical elements in percentage by weight: c: 0.005-0.015%, Si is less than or equal to 0.030%, Mn: 0.15-0.25%, P is less than or equal to 0.020%, S: 0.010-0.020% of Al: 0.030 to 0.060 percent of the total weight of the alloy and less than or equal to 0.0040 percent of the total weight of N. There is a concern about high strength and excellent fishscale resistance and adhesion, for example, CN110343964A describes a cold rolled steel sheet for enamel with a yield strength of more than 500MPa, comprising the following chemical components in percentage by weight: c: 0.10 to 0.15 percent; si is less than or equal to 0.03 percent; mn: 1.0% -1.5%; p is less than or equal to 0.015 percent; s: 0.010% -0.030%; and Als: 0.010% -0.060%; ti: 0.060% -0.100%; n: 0.0030 to 0.0120 percent; b: 0.0010 to 0.0090 percent, and the balance of iron and inevitable impurities. CN108048735A describes "C: not more than 0.008 percent, not more than 0.03 percent of Si, Mn: 1.0-5.0% ", is relatively stable in the enameling firing process, can not cause the reduction of the scale explosion resistance after the enameling firing, but the high Mn content can cause the increase of Mn segregation degree, and the central part of the thickness of the steel plate is easy to form a pearlite or bainite banded structure, and has plasticity and welding performance.
The invention aims to provide a cold-rolled enameled steel sheet with high yield strength, fish scaling resistance, weldability and corrosion resistance, and hopefully, the cold-rolled enameled steel sheet can meet diversified requirements.
Disclosure of Invention
The invention aims to provide a product and a method of a cold-rolled enameled steel sheet with high yield strength, fish scaling resistance, weldability and corrosion resistance, and hopefully, the product and the method can meet diversified requirements.
The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.08-0.09, Si is less than or equal to 0.03, Mn: 1.7-1.9, P is less than or equal to 0.015, S: 0.06-0.07, Als: 0.010 to 0.060, at least one of Ti, Cu, Nb, B, Cr, and Mo in an amount of 0.01 to 0.1, N: 0.0030-0.0120, and the balance of iron and inevitable impurities.
The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.08-0.09, Si is less than or equal to 0.03, Mn: 1.7-1.9, P is less than or equal to 0.015, S: 0.06-0.07, Als: 0.010 to 0.060 wt% and Ti: 0.120 to 0.130, Cu0.01 to 0.03, Nb0.02 to 0.03, B0.001 to 0.003, Cr0.01 to 0.02, Mo0.1 to 0.15, N: 0.0030-0.0120, and the balance of iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
The production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1180-1200 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1010-1020 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 610-620 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 830-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
The role of the alloying elements in the present invention is mainly based on the following considerations:
c: c is a basic element of steel and also a basic reinforcing element, and increases the strength and decreases the plasticity of the steel. The C content is increased, the formed pearlite is increased, the strength is increased, but the plasticity and the formability of the steel are reduced, the weldability is unfavorable, in addition, the C content is too high, the steel is unstable in high-temperature enameling, and the steel is easy to react with water vapor to generate CO, CO2 and H2 gas, so that the defects of pinholes and scale explosion are caused. Therefore, in the consideration of economy and comprehensive performance, the percentage content control range of C in the invention is 0.08-0.09%.
Si: as a harmful element, the high content can damage the plasticity, and lead the oxide scale on the surface of the steel plate to be difficult to remove and to form micro-cracks easily, thus leading the steel plate to crack in the cold rolling processing or the subsequent stamping forming process, therefore, the control range of the percentage content of Si is less than or equal to 0.03 percent.
Mn: mn can reduce the phase transition temperature of austenite transformed into ferrite, expand the hot working temperature range, be beneficial to refining the ferrite grain size, and play a role in deoxidation to eliminate FeO in steel. Mn is also a good desulfurizer, and Mn and S form MnS with a higher melting point, so that the hot brittleness phenomenon caused by FeS can be prevented, and the Mn can be used as a hydrogen trap to improve the scale-blast resistance of steel. In addition, excessive addition of Mn reduces the adhesion property of the enamel steel, and bubble defects are likely to occur. However, the Mn content is too high, the Mn segregation degree of a casting blank is increased in the continuous casting process, the central part of the thickness of the steel plate is easy to form a pearlite or bainite banded structure, and the plasticity, the welding performance and the fatigue performance are all unfavorable, and the control range of the Mn percentage content is 1.7-1.9 percent in comprehensive consideration.
P: p is added in the steel as an alloy element to play a role in solid solution strengthening, and meanwhile, a 'hydrogen trapping' trap can be increased to improve the anti-scaling performance of the steel. However, P has a low diffusion rate in gamma-Fe and alpha-Fe, and is likely to form segregation, and excessive P significantly deteriorates the formability, low-temperature impact toughness, and weldability of the steel sheet. The percentage content control range of P in the invention is that P is less than or equal to 0.015 percent.
S: s is an impurity element that is inevitable in ordinary steel. When S exists in the form of FeS in steel, hot embrittlement of the steel is induced. S can be combined with Mn to form MnS which is an inclusion with excellent plasticity, is a good hydrogen storage trap and is very beneficial to improving the fish scaling resistance of the steel plate, and the production cost is obviously reduced because the invention does not need to purposely pursue low S content as clean steel. However, the S content is too high, SO2 gas is generated in the welding process, SO that pores and looseness can be generated at a welding seam and a heat affected zone, the welding performance can be deteriorated due to the damage of the welding performance, the welding performance of the steel plate is not good, and the S content is 0.06-0.07% comprehensively considered.
Al: al is a commonly used deoxidizer in steel. A small amount of Al is added into the steel, so that the effect of refining grains can be achieved, the deep drawing performance of the steel is improved, and the processing performance of products is improved. Al also has a disadvantage in that, since the surface quality of aluminum killed steel is poor, there are many fine network cracks, the defects are oxidized seriously during enameling to cause the boiling of enamel, which affects hot workability, weldability, and machinability of steel. Therefore, the content of Als in the cold-rolled enamel steel is limited to 0.01 to 0.06% in the present invention.
Ti: ti is not only widely applied to common alloy steel, but also is an important alloy element in the field of steel for enamel. Has strong affinity with C, N, and can form stable compounds with C and S, such as TiN, TiC, Ti (CN), Ti4C2S2 or TiS. The steel plate can not be decomposed at the enameling temperature, the generation of gases such as CO, CO2 and the like in the enameling process is reduced, and the scale burst resistance, pinholes and bubbles of the cold-rolled steel plate are improved. The fine TiN particles precipitated at a higher temperature can effectively prevent austenite grains from growing up, the strength of the steel plate is improved, and the precipitated TiC particles play a role in precipitating strength in the subsequent lower coiling or annealing process. The stable compounds of Ti and S not only likewise enable the steel to be desulphurized, but also promote a homogeneous sulphur distribution, which avoids the disadvantages caused by sulphur. However, the adhesiveness of the steel sheet having an excessively high Ti content is deteriorated, and the Ti content is controlled in the range of 0.12 to 0.13% in the present invention.
Cu: the steel is widely used in common weathering steel and high temperature resistant steel because of providing corrosion resistance and high temperature resistance, but is not commonly used in enamel steel. The copper can play a role in precipitation strengthening in steel, so that the strength of the steel plate is improved, and the plasticity of the steel plate can be improved by proper amount of copper. A small amount of Cu is deposited on the surface of the steel plate, so that the adherence between the steel plate and the porcelain layer is improved, the sintering bonding strength is improved, and the scaling resistance is improved. When the Cu content is increased, the production cost is increased and the surface scale of the pickling step is difficult to pickle. Therefore, the Cu content is set as follows: 0.01 to 0.03 percent.
Nb: the solid-dissolved Nb can increase the recrystallization temperature of the steel, which precipitates NbC, Nb (C, N) similarly to Ti, and ensures sufficient formation of precipitates in different temperature ranges from the precipitates of Ti due to the difference in precipitation temperature, inhibits growth of austenite and ferrite grains, and increases the yield strength of the steel sheet by refining the grains, which is advantageous for obtaining ultra-fine grained ferrite and high yield strength in the present invention. However, Nb is a precious metal, and adding too much Nb increases the alloy cost, so that Nb is limited to 0.02-0.03%.
B: b combines with N to form BN, and substitutes for AlN to improve the press formability of the steel plate and improve the fish scaling resistance of the steel plate. A small amount of B has great influence on the hardness of the steel, and a trace amount of B can improve the mechanical property of the steel to a great extent. BN can obviously increase the number of hydrogen traps in the enamel steel at the crystal boundary and the phase boundary, and the enamel performance of the steel plate is improved. The B content is too low, BN cannot be generated, and the fish scaling resistance is improved. If the content of B is too high, the excessive B present in the steel as a solid solution lowers the press formability, and the element B is expensive, so that cracks are likely to occur in the cast slab. The percentage content of B in the invention is controlled within the range of 0.001-0.003%.
Cr: in general, Cr can improve the strength and corrosion resistance of steel, and in the field of enamel steel, Cr is beneficial to improving the adherence between a steel plate and an enamel layer and improving the fish scaling resistance. In the present invention, Cr is limited to 0.01 to 0.02%.
Mo: mo is beneficial to improving the adherence between the steel and the glass ceramic layer and can also improve the high-temperature deformation resistance of the steel. But too high a mass percentage increases costs. Therefore, Mo is limited to 0.1 to 0.15% in the present invention.
N: n can improve the strength, low-temperature toughness and weldability of steel and increase aging sensitivity. The compound BN is beneficial to improving the fish scaling resistance of the steel. If the N content is too high, the amount of formed nitrides is also high, and the particles become coarse, which seriously impairs the plasticity of the steel. The percentage content of N in the invention is controlled within the range of 0.003-0.012%.
The effect of the process parameters in the present invention is mainly based on the following considerations:
1. setting of heating temperature of casting blank
In the component design, Ti is added to expect to obtain dispersed fine strengthening phase particles, TiN and Ti4C2S2 are generated in the continuous casting process due to high melting point, the particles have adverse effects on steel, and a high slab heating temperature is needed to ensure that large-particle second phase particles can be re-fused into a substrate and then dispersed and separated out, so that the continuous casting slab heating temperature is set to be 1180-1200 ℃.
2. Setting of rolling temperature
In the rough rolling process, in order to recover and recrystallize crystal grains, the rough rolling finishing temperature should be higher than the austenite recrystallization temperature of the steel, and in order to realize austenite zone rolling by subsequent finish rolling, the rough rolling finishing temperature cannot be too low, but the rough rolling finishing temperature cannot be too high, otherwise, the heating temperature of the continuous casting slab must be increased, and the production energy consumption and the cost are increased. Therefore, the rough rolling finishing temperature is set to 1010 to 1020 ℃. The finish rolling finishing temperature is 910-930 ℃.
3. Setting of coiling temperature
The hot rolling coiling temperature is one of key factors influencing mechanical properties, the precipitation temperature of TiC particles is usually between 600 and 900 ℃, the precipitation temperature of NbC particles is usually between 550 and 800 ℃, and the second phase particles have important influence on grain refinement, strength improvement and plasticity. The coiling temperature is set to be 610-620 ℃.
4. Setting of the reduction
The reduction rate adopted by the invention is relatively close to the common hot rolling reduction rate; the final performance of the product is greatly influenced by cold rolling and annealing, the elongation and r value of the product steel plate are improved along with the increase of the cold rolling reduction, and the secondary recrystallization in the annealing process is influenced by cold rolling deformation. The product with too low reduction rate has large anisotropy, and the loss of rolling equipment is large due to too high reduction rate. The reduction rate has influence on the deep drawing performance of the steel plate, the high reduction rate is beneficial to the formation of a deformation texture, and in addition, for the ultra-low carbon steel, if a small amount of edge mixed crystal tissues are generated due to the insufficient finishing temperature of the steel plate, the mixed crystal tissues can be crushed under the action of the large cold rolling reduction rate, and then the tissues are improved through subsequent annealing, so the cold rolling reduction rate is set to be 80-90 percent.
5. Setting of annealing process
The invention adopts the continuous annealing furnace for annealing, and has high production efficiency, regular steel plate type and good annealing uniformity. The steel sheet after cold rolling has a remarkable fibrous structure, has a low strength and a low plasticity, and requires annealing to obtain a structure having a good plasticity. However, since the annealing time of the annealing process is relatively short, a high annealing temperature is required to ensure complete recovery and recrystallization of the microstructure of the steel sheet. In the design, the annealing temperature is controlled to be 830-850 ℃, and the corresponding annealing time is controlled to be 150-200 s.
Compared with the prior art, the invention has the following positive effects: 1. the microstructure of the invention is ferrite, pearlite and C or N-containing precipitate, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8. By suppressing the generation of the pearlite structure, high-temperature deformation of the steel sheet due to repeated decomposition and solid-state transformation of pearlite during hot working and high-temperature enameling is avoided.
2. According to the invention, specific alloying elements are added to limit large-size precipitates, precipitate phases of dispersed small particles are precipitated as much as possible, and a small amount of Cu is added to improve the adherence, so that the deep drawability, the fishscale resistance and the adherence are fully considered; mn is added in a specific amount.
3. The invention provides a manufacturing method suitable for a continuous annealing process through process matching, and the manufacturing method is low in manufacturing difficulty, stable and low in cost. The cold-rolled enameled steel plate product and the method have the advantages of high yield strength, scale explosion resistance, weldability and corrosion resistance, and the product has wide application.
Detailed Description
Example 1
The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.08, Si is less than or equal to 0.03, Mn: 1.7, P is less than or equal to 0.015, S: 0.06, Als: 0.010, Ti: 0.120, Cu0.01, Nb0.02, B0.001, Cr0.01, Mo0.1, N: 0.003, the balance being iron and inevitable impurities;
the production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1180-1200 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1010-1020 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 610-620 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 830-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
Example 2
The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.085, Si is less than or equal to 0.03, Mn: 1.8, P is less than or equal to 0.015, S: 0.066, Als: 0.04, Ti: 0.12, Cu 0.02, Nb0.02, B0.002, Cr 0.02, Mo 0.13, N: 0.007 and the balance of iron and inevitable impurities;
the production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1180-1200 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1010-1020 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 610-620 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 830-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
Example 3
The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.09, Si is less than or equal to 0.03, Mn: 1.9, P is less than or equal to 0.015, S: 0.07, Als: 0.060, Ti: 0.130, Cu 0.03, Nb 0.03, B0.003, Cr 0.02, Mo 0.15, N: 0.012, the balance being iron and inevitable impurities;
the production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1180-1200 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1010-1020 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 610-620 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 830-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
Comparative example 1
Compared with the example 1, the method only comprises the following components:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.008, Si less than or equal to 0.03, Mn: 0.7, P is less than or equal to 0.015, S: 0.02, Als: 0.010, Ti: 0.070, Cu0.01, B0.001, N: 0.003, the balance being iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is 8-10%, the grain size of the ferrite is 20-30 microns, the yield strength is 270-340MPa, the elongation is 37-42%, the hydrogen penetration time is more than or equal to 10min, and the r value is more than or equal to 1.3.
Comparative example 2
Compared with the example 1, the method only comprises the following components:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.03, Si is less than or equal to 0.03, Mn: 1.0, P is less than or equal to 0.015, S: 0.06, Als: 0.010, Ti: 0.120, B0.001, Cr0.01, Mo0.1, N: 0.003, the balance being iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is 8-13%, the grain size of the ferrite is 20-40 microns, the yield strength is 270-380MPa, the elongation is 38-43%, the hydrogen penetration time is more than or equal to 10min, and the r value is more than or equal to 1.4.
Comparative example 3
Compared with the example 1, the method only comprises the following components:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.08, Si is less than or equal to 0.03, Mn: 2, P is less than or equal to 0.015, S: 0.06, Als: 0.010, Ti: 0.080, Cu0.01, Nb0.02, B0.001, Cr0.01, Mo0.1, N: 0.003, the balance being iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is 8-10%, the grain size of the ferrite is 10-20 microns, the yield strength is 450-510MPa, the elongation is 40-43%, the hydrogen penetration time is more than or equal to 13min, and the r value is more than or equal to 1.4.
Comparative example 4
Compared with the example 2, the method only comprises the following steps:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.085, Si is less than or equal to 0.03, Mn: 1.8, P is less than or equal to 0.015, S: 0.066, Als: 0.04, Ti: 0.12, Cu 0.02, Nb0.02, B0.002, Cr 0.02, Mo 0.13, N: 0.007 and the balance of iron and inevitable impurities;
the production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1220-1250 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1030-1050 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8 times of continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 930-950 ℃, the reduction rate of each time is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 650-680 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 830-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is 9-13%, the grain size of the ferrite is 15-20 microns, the yield strength is 440-520MPa, the elongation is 40-45%, the hydrogen penetration time is more than or equal to 13min, and the r value is more than or equal to 1.4.
Comparative example 5
Compared with the example 2, the method only comprises the following steps:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.085, Si is less than or equal to 0.03, Mn: 1.8, P is less than or equal to 0.015, S: 0.066, Als: 0.04, Ti: 0.12, Cu 0.02, Nb0.02, B0.002, Cr 0.02, Mo 0.13, N: 0.007 and the balance of iron and inevitable impurities;
the production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1180-1200 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1010-1020 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 610-620 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 60-75%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 810-830 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is 8-15%, the grain size of the ferrite is 15-25 microns, the yield strength is 480-530MPa, the elongation is 40-43%, the hydrogen penetration time is more than or equal to 12min, and the r value is more than or equal to 1.5.
Comparative example 6
Compared with the example 2, the method only comprises the following steps:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.085, Si is less than or equal to 0.03, Mn: 1.8, P is less than or equal to 0.015, S: 0.066, Als: 0.04, Ti: 0.12, Cu 0.02, Nb0.02, B0.002, Cr 0.02, Mo 0.13, N: 0.007 and the balance of iron and inevitable impurities;
the production method of the cold rolled steel sheet for enameling is characterized in that,
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1200-1250 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6 times of continuous rolling, the rolling is carried out at a temperature above the austenite recrystallization temperature, the finish temperature of the rough rolling is 1030-1050 ℃, and the reduction rate of each time is 8-10%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 8-10%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 550-610 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the soaking section of the cold rolled steel plate in the continuous annealing furnace is 780-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is 7-10%, the grain size of the ferrite is 8-20 microns, the yield strength is 490-530MPa, the elongation is 38.5-42.5%, the hydrogen penetration time is more than or equal to 12min, and the r value is more than or equal to 1.4.
Comparative example 7
Compared with the embodiment 3, the method mainly comprises the following components:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.09, Si is less than or equal to 0.03, Mn: 1.9, P is less than or equal to 0.015, S: 0.07, Als: 0.060, Ti: 0.030, N: 0.012, the balance being iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 10%, the grain size of the ferrite is 25-30 microns, the yield strength is 250-330MPa, the elongation is 38-43%, the hydrogen penetration time is more than or equal to 10min, and the r value is more than or equal to 1.2.
Comparative example 8
Compared with the embodiment 3, the method mainly comprises the following components:
the cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.09, Si is less than or equal to 0.03, Mn: 1.9, P is less than or equal to 0.015, S: 0.07, Als: 0.060, Ti: 0.130, Cu 0.005, Nb 0.005, B0.003, Cr 0.005, Mo 0.05, N: 0.012, the balance being iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 10%, the grain size of the ferrite is 15-20 microns, the yield strength is 460-510MPa, the elongation is 40-42.5%, the hydrogen penetration time is not less than 8min, and the r value is not less than 1.4.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (3)

1. The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.08-0.09, Si is less than or equal to 0.03, Mn: 1.7-1.9, P is less than or equal to 0.015, S: 0.06-0.07, Als: 0.010 to 0.060, at least one of Ti, Cu, Nb, B, Cr, and Mo in an amount of 0.01 to 0.1, N: 0.0030-0.0120, and the balance of iron and inevitable impurities.
2. The cold-rolled steel plate for enamel is characterized by comprising the following chemical components in percentage by mass:
c: 0.08-0.09, Si is less than or equal to 0.03, Mn: 1.7-1.9, P is less than or equal to 0.015, S: 0.06-0.07, Als: 0.010 to 0.060 wt% and Ti: 0.120-0.130, Cu0.01-0.03, Nb0.02-0.03, B0.001-0.003, Cr0.01-0.02, Mo0.1-0.15, N: 0.0030-0.0120, and the balance of iron and inevitable impurities;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
3. A production method of a cold rolled steel sheet for enamel as set forth in any one of claims 1 to 2, characterized in that:
continuously casting molten steel which is pretreated by molten iron, smelted by a converter and refined by LF to obtain a continuous casting slab,
heating the continuous casting plate blank to 1180-1200 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-6-pass continuous rolling and is carried out at the temperature above the austenite recrystallization temperature, the rough rolling finishing temperature is 1010-1020 ℃, and the reduction rate of each pass is 10-12%; the finish rolling is 7-8-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 910-930 ℃, the reduction rate of each pass is 10-15%, laminar cooling is adopted after rolling, the cooling speed is 15-35 ℃/s, and the coiling temperature is controlled at 610-620 ℃;
the hot rolled steel coil is subjected to acid cleaning, cold rolling and annealing and flattening by a vertical continuous annealing furnace, the total reduction rate of the cold rolling is controlled to be 80-90%, a cold rolled steel plate with the thickness of 1.5-2.0mm is obtained, the annealing temperature of the cold rolled steel plate in the soaking section of the continuous annealing furnace is 830-850 ℃, and the annealing time of the steel strip in the soaking section is 150-200 s; the leveling elongation rate is 1.5-2.0%;
the microstructure of the alloy is ferrite, pearlite and C or N-containing precipitates, wherein the volume fraction of the pearlite is less than 5%, the grain size of the ferrite is 5-10 microns, the yield strength is 550-590MPa, the elongation is 40-45%, the hydrogen penetration time is not less than 15min, and the r value is not less than 1.8.
CN202110883175.1A 2021-08-02 2021-08-02 Cold-rolled steel plate for enamel and production method thereof Pending CN113832392A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115595499A (en) * 2022-08-29 2023-01-13 邯郸钢铁集团有限责任公司（Cn） High-strength hot-rolling acid-washing enameled steel strip with excellent fish scaling resistance and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115595499A (en) * 2022-08-29 2023-01-13 邯郸钢铁集团有限责任公司（Cn） High-strength hot-rolling acid-washing enameled steel strip with excellent fish scaling resistance and preparation method thereof
CN115595499B (en) * 2022-08-29 2023-10-31 邯郸钢铁集团有限责任公司 High-strength hot-rolled pickled enamel steel strip with excellent anti-scaling performance and preparation method thereof

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