CN108796391B - Glass-lined steel with excellent plasticity and toughness and fish scaling resistance and manufacturing method thereof - Google Patents
Glass-lined steel with excellent plasticity and toughness and fish scaling resistance and manufacturing method thereof Download PDFInfo
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
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- 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
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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
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
A glass lining steel with excellent plasticity and toughness and fish scaling resistance and a manufacturing method thereof are disclosed, which comprises the following components by weight percent: 0.02-0.06% of C, 0.15-0.35% of Si, 0.50-1.00% of Mn, less than or equal to 0.035% of P, 0.002-0.035% of S, 0.010-0.055% of Al, 0.001-0.009% of N, 0.15-0.25% of Ti, 0.005-0.10% of Cu, 0.005-0.065% of Cr, less than or equal to 0.05% of Ni, less than or equal to 0.05% of Mo, and the balance of Fe and inevitable impurities, wherein the contents of Ti% + 4.43N% + 1.5S% + (0-0.05%) and 0.15% + 5C% + 2.5S% + 4.43N% + 0.40% are satisfied. The steel for glass lining has excellent plasticity, low-temperature toughness, fish scaling resistance, adherence and weldability, can meet the requirement of double-sided enameling, and is particularly suitable for manufacturing glass lining equipment, accessories, enamel products and the like which have complex processing and forming, service temperature of-20 ℃ or even lower and have high requirement on enameling quality.
Description
Technical Field
The invention relates to a steel for glass lining, in particular to a steel for glass lining with excellent plasticity and toughness and fish scaling resistance and a manufacturing method thereof, which can be used for glass lining equipment and glass lining accessories and can also be used for manufacturing enamel containers, tank bodies, products and the like.
Background
The glass lining process is to coat the surface of the formed steel matrix with vitreous glaze containing high silicon dioxide component, and then to form a composite material by sintering at high temperature to make the glaze firmly adhere to the surface of the steel matrix, and the processing process of the composite material is glass lining. Generally, to obtain a desirable glass layer, the glass layer is repeatedly subjected to enameling and firing about 8 times. The glass lining equipment manufactured by the glass lining process has the advantages of glass stability, steel metal strength and toughness and the like, has good wear resistance, better corrosion resistance to various acidic solutions and organic solvents and certain corrosion resistance to alkaline solutions, and therefore, has extremely wide application.
The highest requirement of the existing steel for glass lining in GB 25832-2010 on impact performance is that the impact energy at-20 ℃ is not less than 31J or 34J, and some standards even have no specific requirement on impact performance at all.
The existing special steel plate for glass lining does not ensure impact toughness at all, or only provides impact energy at the most severe temperature of 20 ℃ below zero. For example, the steel plate most used by domestic glass lining equipment at present is Q245R, and the typical components are C: 0.16%, Si: 0.19%, Mn: 0.80%, P: 0.010%, S: 0.002%, Al: 0.035%, and its composition is characterized by high content of carbon and manganese, and hardly contains other alloy elements. The strength of the steel plate is improved mainly by carbon, manganese and silicon, the impact energy is only ensured to be more than 31J at 0 ℃, and the elongation is about 25-30%. Since the microstructure is composed of zonal pearlite and ferrite and the pearlite content is high, it is liable to cause defects such as severe pinholes and bubbles when enameled.
The glass-lined steel disclosed by the Chinese patent CN102899560B comprises the following components: c: 0.05-0.15%, Si is less than or equal to 0.20%, Mn: 0.50-1.60%, P is less than or equal to 0.025%, S is less than or equal to 0.020%, Ti: 0.06-0.18%, Als: 0.005-0.050%, Ti/C: 1.0-1.5 percent of oxygen, less than or equal to 0.0030 percent of oxygen, less than or equal to 0.0060 percent of nitrogen, normalizing the steel plate, wherein the steel contains a pearlite structure, the elongation is 34-36.5 percent, and impact energy is not provided.
The steel plate disclosed by the Chinese patent CN104233063A comprises the following components: c: 0.05-0.15%, Si is less than or equal to 0.15%, Mn: 0.80-2.0%, P: 0.05-0.12%, S is less than or equal to 0.020%, Ti: 0.09-0.20%, Nb: 0.03-0.07%, V: 0.01-0.05%, Als: 0.005-0.050%, N is less than or equal to 0.0060%, and Ti/C: 1.5-3.0, the steel plate needs normalizing treatment, the steel contains 20-30% of pearlite, the elongation is 31-33.5%, impact energy is not provided, and the fish scaling resistance of the steel plate in actual use basically only meets the requirement of single-side enameling.
With the continuous expansion of the application field of glass lining equipment and glass lining accessories, not only the processing and molding are more complicated, but also the service environment of the equipment is more and more severe, for example, the equipment is required to be used in a lower temperature environment below minus 20 ℃, and especially when the equipment and accessories are alternately used in different temperature environments of low temperature and higher temperature, the glass lining equipment and accessories made of the existing glass lining steel are difficult to meet the use requirements.
Disclosure of Invention
The invention aims to provide glass lining steel with excellent plasticity and fishscale resistance and a manufacturing method thereof, the glass lining steel has excellent plasticity and low-temperature toughness, and also has good fishscale resistance, adherence and weldability, the hydrogen penetration time of the glass lining steel is more than or equal to 5min, the yield strength is more than or equal to 245MPa, the tensile strength is more than or equal to 400MPa, the elongation is more than or equal to 35 percent, and the impact power at minus 40 ℃ is more than 250J; can meet the requirement of double-sided enameling, and is particularly suitable for manufacturing glass lining equipment, accessories, enamel products and the like which have more complex processing and forming, service temperature of-20 ℃ or even lower and have high enameling quality requirement.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the glass lining steel with excellent plasticity and toughness and scale explosion resistance comprises the following components in percentage by weight: c: 0.02-0.06%, Si: 0.15 to 0.35%, Mn: 0.50-1.00%, P is less than or equal to 0.035%, S: 0.002-0.035%, Al: 0.010-0.055%, N: 0.001-0.009%, Ti: 0.15-0.25%, Cu: 0.005-0.10%, Cr: 0.005-0.065 percent of Ni, less than or equal to 0.05 percent of Mo, and the balance of Fe and inevitable impurities, wherein the Ti percent is 4C percent +3.43N percent +1.5S percent + (0-0.05 percent), and the Ti percent is less than or equal to 0.15 percent + 5C percent +2.5S percent +4.43N percent and less than or equal to 0.40 percent.
Furthermore, the steel plate for glass lining also comprises more than one of Nb, V and B which can replace part of Ti, wherein Nb is less than or equal to 0.05 percent, V is less than or equal to 0.05 percent, and B is less than or equal to 0.003 percent.
Further, the microstructure of the steel for glass lining according to the present invention is ferrite or ferrite + a small amount of cementite.
The design principle of the components of each chemical element in the steel for glass lining is as follows:
carbon: the high and low carbon content and the presence of carbon in the steel are closely related to the plasticity, toughness and strength of the steel. The higher the carbon content, the higher the strength of the steel, but the plasticity and toughness decrease. For the technical scheme, because a proper amount of alloy elements such as titanium, niobium or vanadium and the like are added into the steel at the same time, the alloy elements and the carbon form carbide to fix most or even all of the carbon in the steel, so that the microstructure in the steel is composed of pure ferrite or ferrite plus a small amount of cementite, the carbon content can be neither too low nor too high, when the carbon content is too low, enough carbide such as titanium carbide and the like can not be formed in the steel, and meanwhile, the strength of the steel is low; when the carbon content is too high, a pearlite structure is formed in the steel or more alloy amount is added, more inclusions and precipitates are formed, which is not good for improving the plasticity and toughness of the steel, and solid structure transformation such as decomposition and precipitation occurs during the heating and cooling of the pearlite structure in the enameling sintering process, which is not good for the enameling quality. Comprehensively considering, in order to obtain excellent plasticity and low-temperature toughness and improve the enameling quality, the carbon content is controlled to be 0.02-0.06%.
Silicon: the silicon plays a role in solid solution strengthening in the steel, the silicon can also improve the high-temperature deformation resistance of the steel, and is beneficial to improving the softening resistance of a steel plate in the high-temperature enameling and firing process, but when the silicon content is too high, not only the plasticity and the toughness of the steel are deteriorated, but also the enameling is adversely affected, and the silicon content is set to be 0.15-0.35%.
Manganese: manganese is a strengthening matrix element. The main purpose of adding manganese is: the strength of the steel is improved, but the plasticity and the toughness of the steel are reduced when the manganese content is too high, the welding performance is adversely affected when the manganese content is too high, and the enameling adhesion performance is affected when the manganese content is deposited on the surface of the steel. In the invention, the content of manganese is controlled to be 0.5-1.0%.
Aluminum: aluminum is a strong deoxidizing element. Because oxygen can form oxide inclusions with poor ductility in steel and is very unfavorable for improving the plasticity and the toughness of the steel, the aluminum is added mainly for deoxidation, and the content of the aluminum is controlled to be 0.010-0.055%.
Titanium: is a strong carbon and nitride forming element. In contrast, titanium alloys are less expensive. The addition of proper amount of titanium in steel is favorable to fixing carbon and nitrogen in steel, and the formed titanium carbide, titanium nitride and composite compound can prevent austenite grains from growing excessively during heating steel billet and refine original austenite grains. After a large number of experiments and comparisons, the source of hydrogen traps in the steel after hot rolling is greatly different from that of the traditional cold-rolled sheet, and meanwhile, only enough hydrogen traps can avoid the scale explosion. The excessively low titanium content does not play the role, excessively high titanium not only increases the alloy cost, but also is unfavorable for the surface quality of the steel plate, and the titanium content is controlled to be 0.15-0.25%.
Niobium, vanadium and boron: niobium, vanadium and boron can play the same role as titanium, replacing titanium to some extent. Niobium can also play a role in refining grains, which is beneficial to improving the plasticity and toughness of steel, but the alloy cost is higher than that of titanium. In the invention, the contents of niobium, vanadium and boron are controlled to be less than or equal to 0.05 percent of Nb, less than or equal to 0.05 percent of V and less than or equal to 0.003 percent of B.
Nitrogen: nitrogen and titanium are easy to form titanium nitride inclusions at high temperature, and the higher the content of titanium and nitrogen is, the larger the formed inclusion particles are, the more unfavorable is to improve the plasticity and low temperature toughness of steel, but the lower the content of nitrogen is, the higher the cost of nitrogen removal is in production. The titanium nitride is used as one of hydrogen storage traps to play a role in resisting scale explosion to a certain extent, so that the nitrogen content in the steel is controlled to be 0.001-0.009%.
Sulfur: in the steel without titanium, sulfur and manganese and the like form manganese sulfide inclusion with good plasticity in the steel, and the transverse plasticity and the toughness of the steel are seriously damaged. In the titanium-added steel, the manganese sulfide exists in a complex inclusion form of manganese sulfide, titanium sulfide and the like more by controlling the content and the processing technology, and the titanium changes the shape of sulfide, but is still unfavorable for improving the plasticity and the toughness of the steel due to larger particle size. The invention requires that the content of S is as follows: 0.002-0.035%.
Phosphorus: phosphorus is an inevitable impurity element in the steel, the plasticity and the toughness of the steel are damaged, and the phosphorus is controlled to be less than or equal to 0.035%.
Copper, chromium, nickel and molybdenum: the trace copper, chromium, nickel and molybdenum are beneficial to improving the adhesion property between the steel plate and the porcelain layer and improving the scale explosion resistance of the steel, and the nickel can also improve the low-temperature impact property of the steel plate. Therefore, a comprehensive consideration is to control copper, chromium, nickel and molybdenum to be all in the range of Cu: 0.005-0.10%, Cr: 0.005-0.065%, Ni less than or equal to 0.05% and Mo less than or equal to 0.05%.
The proportion of titanium to carbon, nitrogen and sulfur is controlled as follows:
Ti％＝4C％+3.43N％+1.5S％+(0～0.05％) (1)
0.15％≤5C％+2.5S％+4.43N％≤0.40％ (2)
according to the measurement, the hydrogen breakthrough Time (TH) of a general hot rolled steel sheet (e.g., Q245R)2Value) of 3.5min or even lower, which is far from meeting the hydrogen penetration time requirement of double-sided enameling, which is also the reason why the double-sided enameling is impossible and even the single-sided enameling is also flaked.
On the basis of sufficient experiments, the steel ensures that enough and stable hydrogen storage traps exist in the steel through reasonable alloy design and process control. Firstly, the steel is required to contain enough titanium, namely, the content of Ti is 4C% + 3.43N% + 1.5S% + (0-0.05%), the content of the titanium is closely related to the content of carbon, nitrogen and sulfur in the steel, and only when the titanium meets the requirement, the carbon, nitrogen and sulfur in the steel can be completely fixed by the titanium to form stable compounds, thereby on one hand, pearlite and massive cementite are prevented from being formed in the steel, on the other hand, the compounds formed by the titanium, the carbon, the nitrogen and the sulfur are beneficial hydrogen storage traps, and the growth of ferrite grains is also inhibited during high-temperature enameling burning. Of course, niobium and vanadium have the same characteristics as titanium and may be substituted in part for titanium, in which case the amount of titanium added may be reduced when niobium and/or vanadium are added. Secondly, compounds formed by titanium, carbon, nitrogen and sulfur are main hydrogen storage traps, the total content of the compounds largely determines the hydrogen storage performance and the fish scaling resistance of the steel, and the following limiting requirements are provided for the content of the carbon, the nitrogen and the sulfur in the steel on the basis of a large number of experimental determination and summary:
0.15% to 5C% + 2.5S% + 4.43N% to 0.40%, which determines the amount of inclusions and precipitates in the steel.
Particularly, when the content is more than or equal to 0.15 percent and less than or equal to 5C percent, 2.5S percent and 4.43N percent, if proper hot working process parameters are matched, enough hydrogen storage traps can be ensured in the steel, and higher TH can be realized2The scale explosion resistance of the steel is improved; when 5C% + 2.5S% + 4.43N% is less than or equal to 0.40%, the plasticity and toughness in the steel are obviously reduced, and excellent plasticity and low-temperature toughness cannot be realized.
The manufacturing method of the steel for glass lining comprises the following steps:
1) smelting and continuous casting
Smelting and continuously casting the components into a blank;
2) rolling of
Heating the continuous casting slab at 1100-1250 ℃, and then carrying out multi-pass rolling, wherein the final rolling temperature is controlled to be 800-950 ℃;
3) cooling down
And air cooling or water cooling the rolled steel plate, wherein the average cooling rate of the water cooling is not more than 50 ℃/s, and the final cooling temperature is 700-850 ℃.
In the method for producing a steel for glass lining of the present invention:
1. smelting and vacuum degassing: ensuring the basic component requirements of molten steel, removing harmful gases such as hydrogen and the like in the steel, adding necessary alloy elements such as manganese, titanium and the like, and simultaneously adjusting the alloy elements; continuous casting is carried out to ensure that the components in the casting blank are uniform and the surface quality is good;
2. heating the continuous casting slab at 1100-1250 ℃ to homogenize an austenite structure, dissolving part of second-phase particles, then performing multi-pass rolling, controlling the final rolling temperature to be 800-950 ℃, and performing air cooling or water cooling on the rolled steel plate, wherein the average cooling rate of water cooling is not more than 50 ℃/s, and the final cooling temperature is 700-850 ℃;
the microstructure of the steel is almost all ferrite microstructure, so the phase transformation temperature is higher, the high final rolling temperature is adopted during hot rolling to realize solid structure transformation and sufficient precipitation of precipitated phases, but the overhigh final rolling temperature can cause the coarsening of ferrite grains and the coarsening of TiC precipitated phases, thereby not only damaging the plasticity and toughness of the steel, but also greatly reducing the hydrogen storage function of the steel and reducing the hydrogen penetration time. Therefore, fully heating the continuous casting billet at 1100-1250 ℃ and finishing the finish rolling at 800-950 ℃ are extremely critical to controlling the grain size of ferrite and the size and distribution of precipitated phases.
3. The cooling is water cooling or air cooling. In the cooling process, titanium can be precipitated in the form of compounds and is uniformly distributed in a matrix in a fine dispersion state, and simultaneously, the ferrite structure in the steel is refined by controlled cooling. The cooling speed is too high, which is not beneficial to fully separating out titanium compounds and nucleating and growing ferrite grains. Therefore, the average cooling rate of the water cooling is controlled to be not more than 50 ℃/s, and the final cooling temperature is 550-850 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the tensile strength Rm of the steel for glass lining is more than or equal to 400MPa, and the elongation percentage A50Not less than 35 percent, and the impact energy at minus 40 ℃ is more than 250J;
(2) the microstructure of the steel for glass lining is ferrite structure or ferrite plus a small amount of cementite, and the steel for glass lining has single structure and does not generate reactions such as pearlite decomposition and the like during high-temperature lining and burning, particularly after multiple high-temperature lining and burning, so the quality of the surface of the steel for glass lining is good;
(3) the manufacturing method of the invention obtains a uniform austenitizing structure and partially dissolves titanium compounds by heating at 1100-1250 ℃, realizes the nucleation and growth of a ferrite structure in steel and prevents the excessive growth of ferrite grains by controlling the final rolling temperature of rolling and the process parameters of cooling after rolling;
(4) the steel for glass lining has good scale explosion resistance and adherence, particularly has excellent plasticity and low-temperature toughness, is suitable for manufacturing glass lining equipment and glass lining accessories by a single-sided or double-sided enameling process, and can also be used for manufacturing enamel containers, tank bodies, products and the like.
Drawings
FIG. 1 is a graph showing impact toughness at various temperatures for example 1 of the present invention.
Detailed Description
The technical scheme of the present invention is further specifically described below based on examples 1 to 7 and comparative example 1.
Table 1 shows the composition of the inventive steel examples, table 2 shows the process parameters of the inventive steel examples, and table 3 shows the properties of the inventive examples, including tensile properties and impact energy (both in transverse samples).
The steel for glass lining of the present invention is produced by the following steps:
1) carrying out converter blowing and vacuum degassing treatment on the molten steel;
2) continuous casting;
3) heating the casting blank at 1100-1250 ℃, and then carrying out multi-pass rolling, controlling the final rolling temperature to be 800-950 ℃, rolling a steel plate with the finished thickness of 2-15 mm by using a hot continuous rolling mill, and rolling a steel plate with the thickness of more than or equal to 8mm by using a single-frame hot rolling mill;
4) and (3) carrying out slow cooling (air cooling or dump cooling) or water cooling on the rolled steel plate, wherein the average cooling rate of the water cooling is not more than 50 ℃/s, and the final cooling temperature of the water cooling is 550-850 ℃.
As can be seen from tables 1 and 2, the above composition design and process parameters are adopted for smelting and processing, the hydrogen penetration time of the finished steel plate is not less than 5min, the yield strength is not less than 245MPa, the tensile strength is not less than 400MPa, the elongation is not less than 35%, and the impact energy at minus 40 ℃ is more than 250J.
As can be seen from FIG. 1, the impact energy of the steel sheet of example 1 at 20 ℃, 0 ℃, 20 ℃ and-40 ℃ is more than 300J, that is, the impact energy is maintained at a high level and is not reduced with the reduction of the impact test temperature.
The double-sided enamel is carried out by adopting the glass-lined enamel glaze and the firing process, the scale explosion phenomenon does not occur, the adherence grade reaches grade I under the condition of applying the ground coat and the overglaze, the excellent scale explosion resistance and adherence are shown, and the processing requirements of glass-lined equipment such as a reaction kettle and a stirring blade and enamel products such as a chemical reaction tank, a water treatment tank and the like are completely met.
Claims (4)
1. The glass lining steel with excellent plasticity and toughness and scale explosion resistance comprises the following components in percentage by weight: c: 0.02-0.06%, Si: 0.15 to 0.35%, Mn: 0.50-1.00%, P is less than or equal to 0.035%, S: 0.002-0.035%, Al: 0.010-0.055%, N: 0.001-0.009%, Ti: 0.15-0.25%, Cu: 0.005-0.10%, Cr: 0.005-0.065%, Ni is less than or equal to 0.05%, Mo is less than or equal to 0.05%, and the balance of Fe and inevitable impurities; and the Ti percent is 4C percent +3.43N percent +1.5S percent + (0-0.05 percent), 5C percent +2.5S percent +4.43N percent is more than or equal to 0.40 percent between 0.15 percent and less than or equal to 0.43 percent;
the microstructure of the steel for glass lining is ferrite or ferrite plus a small amount of cementite;
the hydrogen penetration time of the steel for glass lining is more than or equal to 5min, the yield strength is more than or equal to 245MPa, the tensile strength is more than or equal to 400MPa, the elongation is more than or equal to 35 percent, and the impact energy at minus 40 ℃ is more than 250J;
the steel for glass lining is obtained by a manufacturing method comprising,
1) smelting and continuous casting
Smelting and continuously casting the components into a blank;
2) rolling of
Heating the continuous casting slab at 1100-1250 ℃, and then carrying out multi-pass rolling, wherein the final rolling temperature is controlled to be 800-950 ℃;
3) cooling down
And air cooling or water cooling the rolled steel plate, wherein the average cooling rate of the water cooling is 30-50 ℃/s, and the final cooling temperature is 700-850 ℃.
2. A steel for glass-lined with excellent ductility and toughness and fishscale resistance as claimed in claim 1, further comprising at least one of Nb, V and B, wherein Nb is 0.05% or less, V is 0.05% or less, and B is 0.003% or less.
3. A process for producing a steel for glass lining having excellent ductility and toughness and fishscaling resistance, which comprises,
1) smelting and continuous casting
Smelting and continuously casting into a blank according to the following components; the weight percentages of the components are as follows: c: 0.02-0.06%, Si: 0.15 to 0.35%, Mn: 0.50-1.00%, P is less than or equal to 0.035%, S: 0.002-0.035%, Al: 0.010-0.055%, N: 0.001-0.009%, Ti: 0.15-0.25%, Cu: 0.005-0.10%, Cr: 0.005-0.065%, Ni is less than or equal to 0.05%, Mo is less than or equal to 0.05%, and the balance of Fe and inevitable impurities; and the Ti percent is 4C percent +3.43N percent +1.5S percent + (0-0.05 percent), 5C percent +2.5S percent +4.43N percent is more than or equal to 0.40 percent between 0.15 percent and less than or equal to 0.43 percent;
2) rolling of
Heating the continuous casting slab at 1100-1250 ℃, and then carrying out multi-pass rolling, wherein the final rolling temperature is controlled to be 800-950 ℃;
3) cooling down
Air cooling or water cooling is carried out on the rolled steel plate, the average cooling rate of the water cooling is 30-50 ℃/s, and the final cooling temperature is 700-850 ℃;
the microstructure of the finally obtained glass lining steel is ferrite or ferrite plus a small amount of cementite; the hydrogen penetration time of the steel for glass lining is more than or equal to 5min, the yield strength is more than or equal to 245MPa, the tensile strength is more than or equal to 400MPa, the elongation is more than or equal to 35 percent, and the impact energy at minus 40 ℃ is more than 250J.
4. A process for producing a steel for glass lining having excellent ductility and toughness and fishscaling resistance as claimed in claim 3, wherein said steel for glass lining further comprises at least one of Nb, V and B, Nb being 0.05% or less, V being 0.05% or less and B being 0.003% or less.
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| CN110983159B (en) * | 2019-12-25 | 2021-09-21 | 唐山瑞尔法新材料科技有限公司 | Enameled steel plate and manufacturing method thereof |
| CN113373385A (en) * | 2020-02-25 | 2021-09-10 | 宝山钢铁股份有限公司 | Steel for glass lining and manufacturing method thereof |
| CN111411305B (en) * | 2020-04-21 | 2021-09-14 | 五矿营口中板有限责任公司 | High-toughness high-Ti low-alloy steel with thick glass lining and good glass lining performance and manufacturing method thereof |
| CN114182163A (en) * | 2020-09-15 | 2022-03-15 | 宝山钢铁股份有限公司 | Low-cost high-strength glass lining steel and manufacturing method thereof |
| CN114395688A (en) * | 2021-12-09 | 2022-04-26 | 安阳钢铁集团有限责任公司 | Production process of low-carbon enamel steel |
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