CN112063932B - Hot-rolled enamel steel for deep drawing and manufacturing method thereof - Google Patents

Hot-rolled enamel steel for deep drawing and manufacturing method thereof Download PDF

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CN112063932B
CN112063932B CN202010986947.XA CN202010986947A CN112063932B CN 112063932 B CN112063932 B CN 112063932B CN 202010986947 A CN202010986947 A CN 202010986947A CN 112063932 B CN112063932 B CN 112063932B
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CN112063932A (en
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何晋
辛建卿
王艳
赵建伟
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Shanxi Taigang Stainless 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention belongs to the technical field of hot-rolled enamel steel, and particularly relates to hot-rolled enamel steel for deep drawing and a manufacturing method thereof. The hot-rolled enamel steel for deep drawing comprises the following components in percentage by mass: less than 0.01 percent of C, less than or equal to 0.05 percent of Si, 0.10 to 0.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 0.01 to 0.08 percent of Ti, 0.01 to 0.07 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 4 percent of Ti/N, less than or equal to 10 percent of Ca, 0.0010 to 0.0040 percent of Ca, less than or equal to 1.25 percent of Ca/S, and the balance of Fe and inevitable impurities. The hot-rolled enamel steel for deep drawing has no scale explosion defect after enamel, and has the advantages of good scale explosion resistance and high adhesion strength grade (A1 grade).

Description

Hot-rolled enamel steel for deep drawing and manufacturing method thereof
Technical Field
The invention belongs to the technical field of hot-rolled enamel steel, and particularly relates to hot-rolled enamel steel for deep drawing and a manufacturing method thereof.
Background
The hot-rolled enamel steel has the characteristics of excellent formability, deep drawability, scaling resistance and the like, and is widely applied to the fields of kitchenware, sanitary ware, barbecue utensils and the like. The most main defect of the enamel steel is scale explosion, and the reason for generating the scale explosion is that the steel plate absorbs hydrogen atoms decomposed from water in a furnace in the enamel firing process, supersaturated hydrogen can diffuse to the interface of the steel plate and an enamel layer after cooling and generate very high pressure, and when the pressure exceeds the strength of the enamel layer, a fish scale-shaped enamel layer can fall off. The grain boundary, dislocation, inclusion and two-phase particles can be used as a good hydrogen storage trap to improve the fish scaling resistance, but excessive impurity elements can influence the formability and deep drawability of the steel plate, so the hot-rolled enamel steel for deep drawing and the manufacturing method thereof are provided to solve the problem, the stable control of the two-phase particles is realized through reasonable chemical components and process design, and the properties of the enamel steel plate are well matched.
Disclosure of Invention
The invention aims to provide hot-rolled enamel steel for deep drawing and a manufacturing method thereof aiming at the defects of the prior art.
Specifically, the hot-rolled enamel steel for deep drawing comprises the following components in percentage by mass: less than 0.01 percent of C, less than or equal to 0.05 percent of Si, 0.10 to 0.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 0.01 to 0.08 percent of Ti, 0.01 to 0.07 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 4 percent of Ti/N, less than or equal to 10 percent of Ca, 0.0010 to 0.0040 percent of Ca, less than or equal to 1.25 percent of Ca/S, and the balance of Fe and inevitable impurities.
The hot-rolled enamel steel for deep drawing comprises the following components in percentage by mass: 0.002% -0.009% of C, 0.01% -0.05% of Si, 0.10% -0.7% of Mn, less than or equal to 0.025% of P, 0.002% -0.015% of S, 0.02% -0.07% of Ti, 0.01% -0.06% of Al, less than or equal to 0.008% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015% -0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities.
The hot-rolled enamel steel for deep drawing comprises the following components in percentage by mass: 0.005-0.008% of C, 0.01-0.03% of Si, 0.20-0.50% of Mn, less than or equal to 0.015% of P, 0.002-0.010% of S, 0.02-0.06% of Ti, 0.02-0.06% of Al, less than or equal to 0.007% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015-0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities.
On the other hand, the invention provides a preparation method of hot-rolled enamel steel for deep drawing, which comprises the following steps:
(1) continuously casting molten iron with qualified components into a plate blank;
(2) heating the plate blank, and cooling the plate blank after hot rolling;
(3) and obtaining the hot-rolled enamel steel for deep drawing after coiling, leveling and high-pressure water mortar spraying treatment.
In the preparation method of the hot-rolled enamel steel for deep drawing, the heating temperature of the slab is 1150-1190 ℃.
The preparation method of the hot-rolled enamel steel for deep drawing comprises the steps that the final rolling temperature of hot rolling is 800-900 ℃, and the coiling temperature of coiling is 710-760 ℃.
According to the preparation method of the hot-rolled enamel steel for deep drawing, the accumulative deformation rate of rough rolling of hot rolling is controlled to be more than 70%, and the accumulative deformation rate of finish rolling of hot rolling is controlled to be more than 70%.
According to the preparation method of the hot-rolled enamel steel for deep drawing, the leveling pressure is 700-900 tons, and the leveling elongation is 7-12%.
The preparation method of the hot-rolled enamel steel for deep drawing adopts the high-pressure water mortar to spray, the nozzle pressure is 80-190MPa, and the steel grit granularity is 30-80 meshes.
According to the preparation method of the hot-rolled enamel steel for deep drawing, the hot-rolled yield strength ReL of the hot-rolled enamel steel for deep drawing is more than or equal to 330MPa, the tensile strength Rm is more than or equal to 400MPa, the elongation A is more than or equal to 22%, and the cupping depth is more than or equal to 7 mm.
The technical scheme of the invention has the following beneficial effects:
(1) the hot-rolled enamel steel for deep drawing has the hot-rolled yield strength ReL: 359-402MPa, tensile strength Rm: 447-483MPa, elongation A: 30-41%, cupping depth: 10.9-13.7mm, excellent deep drawing property and formability;
(2) the hot-rolled enamel steel for deep drawing is produced by adopting a high-temperature heating and controlled rolling and controlled cooling process, and the obtained hot-rolled tissues are ferrite and pearlite;
(3) the hot-rolled enamel steel for deep drawing has no scale explosion defect after enamel, and has the advantages of good scale explosion resistance and high adhesion strength grade (A1 grade).
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a metallographic structure diagram of hot-rolled enamel steel for deep drawing prepared in example 1.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The hot-rolled enamel steel product has wide market prospect, high technical requirement, high technical difficulty and high control requirement on a process and equipment integrated system of a production line.
The invention relates to hot-rolled enamel steel for deep drawing and a preparation method thereof, in particular to hot-rolled enamel steel for deep drawing with excellent mechanical property and a preparation method thereof. The hot-rolled enamel steel for deep drawing adopts ultra-low carbon and Ti as alloying elements, and obtains the enamel steel plate with excellent mechanical property by the processes of molten steel external refining control, vacuum degassing and continuous casting, heating temperature, finish rolling temperature, coiling, flattening after coiling, high-pressure water mortar spraying surface treatment and the like, wherein the structure of the enamel steel plate is ferrite and pearlite.
Specifically, the hot-rolled enamel steel for deep drawing comprises the following components in percentage by mass: less than 0.01 percent of C, less than or equal to 0.05 percent of Si, 0.10 to 0.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 0.01 to 0.08 percent of Ti, 0.01 to 0.07 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 4 percent of Ti/N and less than or equal to 10 percent of Ca, 0.0010 to 0.0040 percent of Ca, less than or equal to 1.25 percent of Ca/S, and the balance of Fe and inevitable impurities; preferably, the composite material comprises the following components in percentage by mass: 0.002% -0.009% of C, 0.01% -0.05% of Si, 0.10% -0.7% of Mn, less than or equal to 0.025% of P, 0.002% -0.015% of S, 0.02% -0.07% of Ti, 0.01% -0.06% of Al, less than or equal to 0.008% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015% -0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities; more preferably, the composite material comprises the following components in percentage by mass: 0.005-0.008% of C, 0.01-0.03% of Si, 0.20-0.50% of Mn, less than or equal to 0.015% of P, 0.002-0.010% of S, 0.02-0.06% of Ti, 0.02-0.06% of Al, less than or equal to 0.007% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015-0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities.
The hot-rolled enamel steel for deep drawing has the following components:
c is the most economical strengthening element in steel, and in the hot-rolled enamel steel for deep drawing of the present invention, when the carbon content is more than 0.01%, the plasticity, formability and deep drawing property of the steel are reduced as the strength is increased; therefore, the percentage content of C in the invention is controlled below 0.01%. Preferably, the hot-rolled enamel steel for drawing of the present invention has a carbon content of 0.002% to 0.009%, and most preferably 0.005% to 0.008%.
Si acts as a solid solution strengthening effect in steel to increase the strength of steel, but decreases toughness and ductility of steel to make deep drawing of steel difficult, and an excessively high silicon content decreases adhesion between steel and enamel. According to the invention, the silicon content is controlled to be below 0.05%, so that the high strength of the enamel steel is ensured, and the adhesion between the enamel steel and the enamel is improved. Among them, when the silicon content is 0.01-0.05%, the performance of the enamel steel is better, and when the silicon content is 0.01-0.03%, the performance of the enamel steel is optimal.
Mn can improve the yield strength and the tensile strength of the steel and play a certain role in solid solution strengthening, and the increase of Mn content can reduce the plasticity of the steel. Mn can combine with S to generate manganese sulfide, and the manganese sulfide as second phase particles can improve the hydrogen storage performance of the steel. When the content of Mn is more than 0.80%, the plasticity and work formability of the steel are reduced; when the content of Mn is less than 0.10%, the possibility of occurrence of hot shortness is increased. Preferably, the content of Mn in the enamel steel of the present invention is 0.10% to 0.70%, and most preferably, the content of Mn in the enamel steel of the present invention is 0.20% to 0.50%.
P and S are harmful elements in steel, have certain influence on the deep drawability of a steel plate, the lower the content is, the better the content is, but in titanium-added steel, S can generate corresponding compounds with elements such as Ti, C, Mn and the like, and has certain effect on improving the fish scaling resistance.
Ti not only improves the strength of the enamel steel, but also forms compounds such as TiN, Ti (C, N) and Ti with C, N, S in the steel4C2S2And the like. These compounds act as effective hydrogen storage traps and can improve the fishscale resistance of steel sheets. According to the invention, the scale explosion resistance of the steel plate can be effectively improved by controlling the content of Ti to be 0.01-0.08%, when the content of Ti is lower than the minimum value of the range, the strength cannot be ensured, the amount of precipitates is small, and the scale explosion possibility is high; when the content of Ti is more than the maximum of the rangeThe quality of the slab during continuous casting is affected. Preferably, the content of Ti in the enamel steel of the present invention is 0.02% to 0.07%, most preferably 0.02% to 0.06%.
The main function of Al is to deoxidize and reduce the oxygen content in the steel. According to the invention, the content of Al is controlled to be 0.01-0.07%, the scale explosion resistance of the steel plate can be effectively improved, and when the content of Al is lower than the minimum value of the range, a large amount of oxides can be generated, so that the toughness of the steel is reduced; when the content of Al is more than the maximum value of the range, the steel-making cost is increased and surface defects are also generated. Preferably, the content of Al in the enamel steel of the present invention is 0.01% to 0.06%, most preferably 0.02% to 0.06%.
N is easy to form TiN particles with Ti in steel, can inhibit austenite grains from growing and plays a role in precipitation strengthening. In the invention, N is less than or equal to 0.010 percent, and when the content of N is more than 0.010 percent, the plasticity and the formability of the steel plate are reduced. Preferably, the content of N in the enamel steel of the invention is less than 0.008 percent, and most preferably less than or equal to 0.007 percent.
Ti/N is the ratio of the content of titanium element and nitrogen element in the enamel steel, and the control range is more than or equal to 4 and less than or equal to 10. When Ti/N is less than 4, austenite grains are coarse, and the plasticity of the steel is reduced; when Ti/N is more than 10, the probability of forming large TiN lumps is increased, and the plasticity of the steel is deteriorated.
The Ca content is controlled to be 0.0010-0.0040 percent, when the Ca content is lower than the minimum value of the range, the form of the non-metallic inclusion cannot be improved, and the calcium treatment effect cannot be achieved; when the content of Ca is more than the maximum value of the range, the probability of forming non-metallic inclusions increases. Preferably, the content of Ca in the enamel steel of the present invention is 0.0015% to 0.0035%.
Ca/S is the ratio of the contents of calcium element and sulfur element in the enamel steel, and when the Ca/S is less than or equal to 1.25, the anisotropy of plasticity and toughness of the steel can be eliminated; when Ca/S > 1.25, the amount of low plasticity sulfides increases, affecting the plasticity of the steel.
The elements with specific contents exert synergistic effect to ensure that the hot-rolled mechanical property of the hot-rolled enamel steel for deep drawing reaches the following levels: the yield strength ReL is more than or equal to 330MPa, the tensile strength Rm is more than or equal to 400MPa, the elongation A is more than or equal to 22 percent, and the depth of the cupping is more than or equal to 7 mm.
On the other hand, the invention also provides a preparation method of the hot-rolled enamel steel for deep drawing, which comprises the following steps:
(1) continuously casting molten iron with qualified components into a plate blank;
(2) heating the plate blank, and cooling the plate blank after hot rolling;
(3) and obtaining the hot-rolled enamel steel for deep drawing after coiling, leveling and high-pressure water mortar spraying treatment.
The molten iron with qualified components comprises the following components in percentage by mass: less than 0.01 percent of C, less than or equal to 0.05 percent of Si, 0.10 to 0.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 0.01 to 0.08 percent of Ti, 0.01 to 0.07 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 4 percent of Ti/N and less than or equal to 10 percent of Ca, 0.0010 to 0.0040 percent of Ca, less than or equal to 1.25 percent of Ca/S, and the balance of Fe and inevitable impurities; preferably, the composite material comprises the following components in percentage by mass: 0.002% -0.009% of C, 0.01% -0.05% of Si, 0.10% -0.7% of Mn, less than or equal to 0.025% of P, 0.002% -0.015% of S, 0.02% -0.07% of Ti, 0.01% -0.06% of Al, less than or equal to 0.008% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015% -0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities; more preferably, the composite material comprises the following components in percentage by mass: 0.005-0.008% of C, 0.01-0.03% of Si, 0.20-0.50% of Mn, less than or equal to 0.015% of P, 0.002-0.010% of S, 0.02-0.06% of Ti, 0.02-0.06% of Al, less than or equal to 0.007% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015-0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities.
In some preferred embodiments, the method for preparing hot-rolled enamel steel for deep drawing according to the present invention comprises: molten iron pretreatment → converter smelting → external refining (LF + RH) → continuous casting → slab heating → hot rolling → cooling after rolling → coiling → leveling → high pressure water mortar spraying → leveling → packaging mark → warehousing.
Wherein the slab is formed by converter smelting and external refining (LF + RH) continuous casting, and optionally, the thickness of the slab is 200-230 mm.
Preferably, the heating temperature of the slab is 1150-1190 ℃. The deformation resistance can be reduced by heating the plate blank to an austenite area, and simultaneously, the micro-alloy elements are fully dissolved so as to be precipitated again in the rolling and cooling processes to play a role in precipitation strengthening.
The hot rolling includes rough rolling and finish rolling. The slab can be refined austenite grains after being subjected to multi-pass large-deformation rolling by a rough rolling mill, and preferably, the accumulated deformation rate of the rough rolling is controlled to be more than 70%. And (3) rolling the plate blank to a target thickness of 3mm by adopting a multi-stand hot continuous rolling unit in the finish rolling, wherein the finish rolling temperature is 800-900 ℃, and preferably, the accumulated deformation rate of the finish rolling is controlled to be more than 70%.
The accumulated deformation rates in the rough rolling process and the finish rolling process are respectively controlled to be more than 70 percent, so that austenite grains can be elongated and form a deformation zone, the deformation zone can provide a large number of nucleation positions for the transformation from austenite to ferrite, ferrite grains after phase transformation are finer and more uniform, the grains are finer, the grain boundary area is larger, and the improvement on the scale explosion resistance of the steel plate is facilitated.
Preferably, the rolled steel plate is cooled by a laminar cooling method and then coiled at 710-760 ℃. Coiling at the temperature can not only meet the strength requirement, but also ensure that more dispersed precipitates are generated, and is favorable for improving the scale explosion resistance of the enameled pressed steel.
Further, the coiled and cooled steel coil is leveled, the leveling pressure is 700-900 tons, and the leveling elongation is 7-12%, so that the yield platform can be eliminated, and the mechanical property stability of the steel plate can be improved.
Further, the leveled steel coil is subjected to high-pressure water mortar spraying treatment, the water mortar is mixed slurry of water and steel grit, the nozzle pressure is 80-190MPa, the granularity of the steel grit is 30-80 meshes, the iron scale can be effectively removed after treatment, and the uniformity of the surface of the steel plate can be ensured.
According to the preparation method of the hot-rolled enamel steel for deep drawing, during rolling, fine-grained ferrite is obtained by reasonably setting the heating, final rolling and coiling temperatures, so that the precipitation of Ti compounds is realized; during leveling, the reasonable leveling process can eliminate yield plateau and improve the stability of the mechanical properties of the steel plate. When the high-pressure water mortar is sprayed, the reasonable high-pressure water mortar spraying treatment process can not only effectively remove the iron scale, but also ensure the uniformity of the surface of the steel plate.
The hot-rolled enamel steel for deep drawing prepared by the method has the hot-rolled yield strength ReL of more than or equal to 330MPa, the tensile strength Rm of more than or equal to 400MPa, the elongation A of more than or equal to 22 percent and the cupping depth of more than or equal to 7 mm. The hot rolling structure is ferrite and pearlite, and the performance requirement of the hot rolling enamel steel for deep drawing is met.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
Example 1
The hot-rolled enamel steel for deep drawing of the embodiment has a steel plate thickness of 3mm and a width of 1395mm, and comprises the following chemical components in percentage by mass:
c: 0.006%, Si: 0.05%, Mn: 0.65%, P: 0.010%, S: 0.012%, Ti: 0.06%, Al: 0.05%, N: 0.007%, Ti/N: 9, Ca: 0.0020%, Ca/S: 0.17, and the balance of Fe and inevitable impurities.
The embodiment of the manufacturing method of the hot-rolled enamel steel for deep drawing sequentially comprises the following steps:
1. the steel is continuously cast into a plate blank after smelting in a converter and refining outside the converter (LF + RH), and the specification of the plate blank is 230mm multiplied by 1400 mm.
2. And heating the plate blank to 1185 ℃, and rolling the plate blank to the target thickness of 3mm by adopting a multi-stand hot continuous rolling unit, wherein the accumulated deformation rates of the rough rolling and the finish rolling are respectively more than 70%. The finishing temperature is 885 ℃, the coiling temperature is 742 ℃ after the cooling by adopting a laminar cooling mode.
3. And leveling the coiled and cooled steel coil, wherein the leveling pressure is 760 tons, and the leveling elongation is 8%.
4. And (3) spraying high-pressure water mortar on the leveled steel coil, wherein the pressure of a nozzle is 107MPa, and the granularity of steel sand is 50 meshes.
And (4) performance test results: the yield strength ReL of the steel plate is 382MPa, the tensile strength Rm is 475MPa, the elongation A is 35 percent, and the depth of the cupping is 12.5 mm.
Examples 2 to 7
Next, the same rolling process as in example 1 was used to prepare the same size and specification of enamel steel from the same size and specification of continuous cast slab. Wherein, the components of the enamel steel of each embodiment are shown in table 1, the main preparation process parameters of the enamel steel of each embodiment are shown in table 2, and the performance test results of the prepared enamel steel are shown in table 3.
TABLE 1 summary of the composition of the enamelled steels of examples 2 to 7
C Si Mn P S Ti Al N Ti/N Ca Ca/S
Example 2 0.005 0.01 0.26 0.01 0.007 0.02 0.023 0.003 7 0.0018 0.26
Example 3 0.007 0.03 0.47 0.03 0.008 0.03 0.06 0.005 6 0.0029 0.36
Example 4 0.004 0.02 0.8 0.04 0.003 0.04 0.042 0.009 4 0.0034 1.13
Example 5 0.002 0.04 0.52 0.02 0.015 0.01 0.035 0.002 5 0.0010 0.07
Example 6 0.008 0.03 0.35 0.02 0.005 0.05 0015 0.005 10 0.0040 0.80
Example 7 0.009 0.02 0.1 0.01 0.002 0.08 0.07 0.010 8 0.0025 1.25
TABLE 2 summary of process parameters for the preparation of enamelled steels according to examples 2 to 7
Figure BDA0002689572530000091
TABLE 3 summary of the results of the tests for the properties of the enamelled steels of examples 2 to 7
Figure BDA0002689572530000092
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.

Claims (10)

1. The hot-rolled enamel steel for deep drawing is characterized by comprising the following components in percentage by mass: less than 0.01 percent of C, less than or equal to 0.05 percent of Si, 0.52 to 0.8 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 0.01 to 0.03 percent of Ti, 0.01 to 0.07 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 4 percent of Ti/N and less than or equal to 10 percent of Ca, 0.0010 to 0.0040 percent of Ca, less than or equal to 1.25 percent of Ca/S, and the balance of Fe and inevitable impurities;
the preparation method of the hot-rolled enamel steel for deep drawing comprises the following steps: (1) continuously casting molten iron with qualified components into a plate blank; (2) heating the plate blank, and cooling the plate blank after hot rolling; (3) after coiling, leveling and high-pressure water mortar spraying treatment, hot-rolled enamel steel for deep drawing is obtained; wherein the heating temperature of the plate blank is 1150-1190 ℃; the final rolling temperature of the hot rolling is 800-900 ℃, and the coiling temperature of the coiling is 710-760 ℃; the accumulated deformation rate of the rough rolling of the hot rolling is controlled to be more than 70%, and the accumulated deformation rate of the finish rolling of the hot rolling is controlled to be more than 70%; the leveling pressure is 700 tons, and the leveling elongation is 7-12%.
2. The hot-rolled enameled steel for deep drawing according to claim 1, wherein the steel comprises, in mass percent: 0.002% -0.009% of C, 0.01% -0.05% of Si, 0.52% -0.8% of Mn, less than or equal to 0.025% of P, 0.002% -0.015% of S, 0.01% -0.03% of Ti, 0.01% -0.06% of Al, less than or equal to 0.008% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015% -0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities.
3. The hot-rolled enameled steel for deep drawing according to claim 2, wherein it comprises, in mass%: 0.005-0.008% of C, 0.01-0.03% of Si, 0.52-0.8% of Mn, less than or equal to 0.015% of P, 0.002-0.010% of S, 0.01-0.03% of Ti, 0.02-0.06% of Al, less than or equal to 0.007% of N, less than or equal to 4% of Ti/N, less than or equal to 10% of Ca, 0.0015-0.0035% of Ca/S, less than or equal to 1.25% of Ca, and the balance of Fe and inevitable impurities.
4. The method for producing hot-rolled enamel steel for deep drawing as set forth in any one of claims 1 to 3, comprising:
(1) continuously casting molten iron with qualified components into a plate blank;
(2) heating the plate blank, and cooling the plate blank after hot rolling;
(3) and obtaining the hot-rolled enamel steel for deep drawing after coiling, leveling and high-pressure water mortar spraying treatment.
5. The method for preparing hot-rolled enameled steel for deep drawing according to claim 4, wherein the slab is heated at 1150-1190 ℃.
6. The method for preparing hot-rolled enameled steel for deep drawing as claimed in claim 4, wherein the final rolling temperature of the hot rolling is 800-900 ℃, and the coiling temperature of the coiling is 710-760 ℃.
7. The method of claim 4, wherein the hot rolling has a rough rolling cumulative deformation ratio of 70% or more, and the hot rolling has a finish rolling cumulative deformation ratio of 70% or more.
8. The method for preparing hot-rolled enameled steel for deep drawing as claimed in claim 4, wherein the leveling pressure is 700 tons and the leveling elongation is 7-12%.
9. The method for manufacturing hot-rolled enameled steel for deep drawing according to claim 4, wherein the high-pressure water mortar is sprayed, the nozzle pressure is 80-190MPa, and the grit size is 30-80 mesh.
10. The method for preparing the hot-rolled enameled steel for deep drawing according to any one of claims 4-9, characterized in that the hot-rolled yield strength ReL of the hot-rolled enameled steel for deep drawing is not less than 330MPa, the tensile strength Rm is not less than 400MPa, the elongation A is not less than 22%, and the cupping depth is not less than 7 mm.
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CN103540845A (en) * 2013-11-07 2014-01-29 武汉钢铁(集团)公司 Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof
CN103589953A (en) * 2013-11-07 2014-02-19 武汉钢铁(集团)公司 Hot rolled thin plate enamel steel with 245-MPa yield strength and manufacturing method thereof
CN104962810A (en) * 2015-07-08 2015-10-07 武汉钢铁(集团)公司 Sheet enamel steel for subway decoration and production method thereof
CN107663610A (en) * 2016-07-29 2018-02-06 本钢板材股份有限公司 A kind of production method of 330MPa levels one side enamel hot rolling acid-cleaning steel plate

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103540845A (en) * 2013-11-07 2014-01-29 武汉钢铁(集团)公司 Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof
CN103589953A (en) * 2013-11-07 2014-02-19 武汉钢铁(集团)公司 Hot rolled thin plate enamel steel with 245-MPa yield strength and manufacturing method thereof
CN104962810A (en) * 2015-07-08 2015-10-07 武汉钢铁(集团)公司 Sheet enamel steel for subway decoration and production method thereof
CN107663610A (en) * 2016-07-29 2018-02-06 本钢板材股份有限公司 A kind of production method of 330MPa levels one side enamel hot rolling acid-cleaning steel plate

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