CN110695098B - Method for refining steel grains for glazing - Google Patents

Method for refining steel grains for glazing Download PDF

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CN110695098B
CN110695098B CN201910931230.2A CN201910931230A CN110695098B CN 110695098 B CN110695098 B CN 110695098B CN 201910931230 A CN201910931230 A CN 201910931230A CN 110695098 B CN110695098 B CN 110695098B
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steel
pass
rolling
temperature
glazing
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CN110695098A (en
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朱鸣芳
邹鑫熠
王宁
潘敏
安栋
蒋鸣
戴挺
布鲁斯·克拉考尔
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Southeast University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a method for refining steel grains for glazing, which comprises the following steps: putting the steel ingot into a high-temperature smelting furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours; placing the heated steel ingot on a rolling mill, and carrying out six-pass rolling to obtain rolled steel; wherein the initial rolling temperature of the first three times of rolling is 1000-1100 ℃, and the initial rolling temperature of the last three times of rolling is 840-850 ℃; and (3) cooling the obtained rolled steel plate in a continuous water cooling device at the cooling rate of 18-19 ℃, wherein the water outlet temperature of the water cooling device is 440-480 ℃, and after the temperature of the rolled steel plate is reduced to be consistent with the water outlet temperature of the water cooling device, air cooling the rolled steel plate to room temperature to obtain the steel for glazing.

Description

Method for refining steel grains for glazing
Technical Field
The invention relates to a method for refining steel grains for glazing, belonging to the technical field of steel rolling production.
Background
The glazed steel is a composite material in which a layer of vitreous enamel with the thickness of 100-500 mu m is enameled on the surface of a steel plate (steel for glazing) and the vitreous enamel is fired at high temperature to firmly bond metal and inorganic oxide. The glazed steel not only keeps the characteristics of toughness and impact resistance of a steel plate base material, but also has the characteristics of strong acid and alkali resistance, corrosion resistance, non-combustion, easy cleaning, no pollution, no radiation and the like of a glaze layer, and is widely applied to the fields of light industry, household appliances, metallurgy, chemical industry, buildings and the like. The glazing steel needs to bear certain temperature and stress in a certain service process (such as the glazing steel for the inner container of the water heater), so that the glazing steel is required to have higher yield strength after being subjected to glazing sintering, but the thermal cycle treatment for firing glass glaze can cause the problem that the yield strength of the glazing steel is reduced, so that the inner container of the water heater risks failure in the use process.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for refining the steel crystal grains for glazing, which combines micro-alloying and deformation induced ferrite phase transition (DSIT) processes to greatly refine the grain diameter of the steel crystal grains for glazing, thereby improving the yield strength of the steel for glazing.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for refining steel grains for glazing specifically comprises the following steps:
(1) putting the steel ingot into a high-temperature smelting furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours;
(2) placing the heated steel ingot on a rolling mill, and carrying out six-pass rolling to obtain rolled steel; wherein the initial rolling temperature of the first three times of rolling is 1000-1100 ℃, and the initial rolling temperature of the last three times of rolling is 840-850 ℃;
(3) and (3) cooling the rolled steel plate obtained in the step (2) in a continuous water cooling device at a cooling rate of 18-19 ℃, wherein the water outlet temperature of the water cooling device is 440-480 ℃, and after the temperature of the rolled steel plate is reduced to be consistent with the water outlet temperature of the water cooling device, air-cooling the rolled steel plate to room temperature to obtain the steel for glazing.
The steel ingot comprises the following components in percentage by mass: c: 0.065-0.069 wt.%, Si: 0.48 to 0.51 wt.%, Mn: 1.18-1.25 wt.%, P: 0.045-0.052 wt.%, Al: 0.022-0.032 wt.%, Cu: 0.15-0.17 wt.%, Nb: 0.02-0.06 wt.%, S: 0.0033 wt.%, N: 0.0023wt.%, Ti: 0.0015wt.%, Sn: 0.0022wt.%, B: 0.001wt.%, the balance being Fe and other unavoidable impurities.
In the step (2), before six-pass rolling, the roller spacing is made larger than the thickness of the steel ingot, and after one-pass rolling, six-pass rolling is carried out.
In the step (2), in the six-pass rolling process, the roller distances from the first pass to the sixth pass are 60mm, 45mm, 32mm, 15mm, 6mm and 2.3mm in sequence.
In the step (2), in the six-pass rolling process, the reduction ratios from the first pass to the sixth pass are as follows: 25%, 28.9%, 53.1%, 60.0% and 61.7%.
Has the advantages that: the method combines micro-alloying and DSIT technology, on one hand, the refinement of ferrite grains is promoted, on the other hand, the strain energy can be released, the growth of the grains after heat treatment caused by residual strain energy is avoided, and the refinement of the grains and the release of the strain energy can obviously improve the rolling state of the steel for glazing and the yield strength after heat treatment.
Drawings
FIG. 1 is a microstructure of a rolled steel for glazing containing no Nb;
FIG. 2 is a microstructure of a rolled steel for glazing containing 0.02 wt.% Nb;
FIG. 3 is a microstructure of a rolled steel for glazing containing 0.04 wt.% Nb;
FIG. 4 is a microstructure of a rolled steel for glazing containing 0.06 wt.% Nb;
FIG. 5 is a stress-strain curve for glazing steels of varying Nb content.
Detailed Description
The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the description of the embodiments is only for illustrating the present invention and should not be taken as limiting the invention as detailed in the claims.
Example 1
The steel ingot in this example comprises the following components: 0.0674 wt.% C, 0.506 wt.% Si, 1.25 wt.% Mn, 0.0501 wt.% P, 0.0313 wt.% Al, 0.157 wt.% Cu, 0.0205 wt.% Ti, 0.0030 wt.% S, the balance being iron and other unavoidable impurities.
The rolling process of the steel ingot in the embodiment is as follows:
step 1, placing the steel ingot into a high-temperature induction furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours;
step 2, removing oxide skin on the surface of the steel ingot discharged from the furnace after heat preservation in the step 1, then placing the steel ingot on a rolling mill, and performing six-pass rolling to obtain rolled steel; the rolling temperature of each pass is shown in table 1, the roller spacing of each pass is shown in table 2, and after the third pass of rolling is finished, the fourth pass of rolling is started when the temperature of the steel plate is reduced to 840 ℃;
and 3, cooling the steel material after the sixth rolling in the step 2 in a continuous water cooling device at the water cooling speed of 19 ℃/s and the water outlet temperature of the water cooling device of 440 ℃, and performing air cooling to room temperature after the temperature of the steel material is reduced to be consistent with the water outlet temperature.
Table 1 shows the temperature parameters/. degree.C.for the rolling process of example 1
Figure BDA0002218003350000021
。
TABLE 2 roll spacing and reduction parameters
Figure BDA0002218003350000032
Example 2
The steel ingot in this example comprises the following components: 0.0659 wt.% C, 0.488 wt.% Si, 1.185 wt.% Mn, 0.0453 wt.% P, 0.0224 wt.% Al, 0.1579 wt.% Cu, 0.0213 wt.% Nb, 0.0033 wt.% S, 0.0023wt.% N, 0.0015wt.% Ti, 0.0022wt.% Sn, 0.001wt.% B, the balance being iron and unavoidable impurities.
The rolling process used for the steel ingot in the embodiment is as follows:
step 1, placing the steel ingot into a high-temperature induction furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours;
step 2, removing oxide skins on the surfaces of the steel ingots discharged from the furnace after heat preservation in the step 1, then placing the steel ingots on a rolling mill, and performing six-pass rolling to obtain rolled steel, wherein the initial rolling temperature of each pass is shown in table 3, the roller spacing of each pass is shown in table 2, and after the third pass of rolling is finished, performing fourth pass of rolling when the temperature of the steel plates is reduced to 840 ℃;
and 3, cooling the steel after the sixth rolling in the step 2 in a continuous water cooling device at the water cooling speed of 19.0 ℃/s and the water outlet temperature of the water cooling device of 442-460 ℃, and cooling the steel to room temperature in an air cooling mode after the temperature of the steel is reduced to be consistent with the water outlet temperature.
Table 3 shows the temperature parameters/. degree.C.for the rolling process of example 2
Figure BDA0002218003350000033
Example 3
The steel ingot in this example comprises the following components: 0.0670 wt.% C, 0.498 wt.% Si, 1.221 wt.% Mn, 0.0480 wt.% P, 0.0314 wt.% Al, 0.1601 wt.% Cu, 0.0410 wt.% Nb, 0.0033 wt.% S, 0.0023wt.% N, 0.0015wt.% Ti, 0.0022wt.% Sn, 0.001wt.% B, the balance being iron and unavoidable impurities.
The rolling process used for the steel ingot in the embodiment is as follows:
step 1, placing the steel ingot into a high-temperature induction furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours;
step 2, removing oxide skins on the surfaces of the steel ingots discharged from the furnace after heat preservation in the step 1, then placing the steel ingots on a rolling mill, and performing six-pass rolling to obtain rolled steel, wherein the initial rolling temperature of each pass is shown in table 4, the roller spacing of each pass is shown in table 2, and after the third pass of rolling is finished, performing fourth pass of rolling when the temperature of the steel plates is reduced to 840 ℃;
and 3, cooling the steel after the sixth rolling in the step 2 in a continuous water cooling device at the water cooling speed of 18.8 ℃/s and the water outlet temperature of the water cooling device of 445-462 ℃, and performing air cooling to room temperature after the temperature of the steel is reduced to be consistent with the water outlet temperature.
Table 4 shows the temperature parameters/. degree.C.for the rolling process of example 3
Figure BDA0002218003350000041
Example 4
The steel ingot in this example comprises the following components: 0.0687 wt.% C, 0.505 wt.% Si, 1.236 wt.% Mn, 0.0514 wt.% P, 0.0264 wt.% Al, 0.1617 wt.% Cu, 0.0625 wt.% Nb, 0.0033 wt.% S, 0.0023wt.% N, 0.0015wt.% Ti, 0.0022wt.% Sn, 0.001wt.% B, the balance being iron and unavoidable impurities.
The rolling process used for the steel ingot in the embodiment is as follows:
step 1, placing the steel ingot into a high-temperature induction furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours;
step 2, removing oxide skins on the surfaces of the steel ingots discharged from the furnace after heat preservation in the step 1, then placing the steel ingots on a rolling mill, and performing six-pass rolling to obtain rolled steel, wherein the initial rolling temperature of each pass is shown in table 5, the roller spacing of each pass is shown in table 2, and after the third pass of rolling is finished, performing fourth pass of rolling when the temperature of the steel plates is reduced to 840 ℃;
and 3, cooling the steel after the sixth rolling in the step 2 in a continuous water cooling device at the water cooling speed of 18.2 ℃/s, wherein the water outlet temperature of the water cooling device is 467-479 ℃, and performing air cooling to room temperature after the temperature of the steel is reduced to be consistent with the water outlet temperature.
Table 5 shows the temperature parameters/. degree.C.for the rolling process of example 4
Figure BDA0002218003350000042
Table 6 shows the grain size and yield strength of the steel sheets obtained in each example
Figure BDA0002218003350000051
As can be seen from Table 6, the method of the present invention achieves the ultrafineness of the steel grains for glazing by the combined action of the microalloying and the DSIT process. The invention adds Nb and other alloy elements on the basis of low-carbon steel, and controls the rolling temperature of the steel plate to be A by combining the DSIT processr3Near the temperature (different Nb contents and corresponding rolling temperatures), the steel is enabled to separate out ultrafine ferrite grains under the deformation induced phase change effect and the strong grain refinement and precipitation strengthening effect of the Nb element, and meanwhile, the grain growth in the cooling process is inhibited by controlling the cooling speed, thereby realizing the effective grain size refinement.

Claims (1)

1. A method for refining steel grains for glazing is characterized by comprising the following steps:
(1) placing the steel ingot into a high-temperature induction furnace at 1150 +/-50 ℃ and preserving heat for 2-3 hours;
(2) removing oxide skin on the surface of the steel ingot discharged from the furnace after heat preservation in the step (1), then placing the steel ingot on a rolling mill, and performing six-pass rolling to obtain rolled steel; before six-pass rolling, the roller spacing is made to be larger than the thickness of the steel ingot, and after one-pass rolling, the six-pass rolling is carried out; in the six-pass rolling process, the initial rolling temperature of each pass is as follows: the method comprises the following steps of a first step of 1007 ℃, a second step of 1005 ℃, a third step of 1005 ℃, a fourth step of 846 ℃, a fifth step of 844 ℃ and a sixth step of 841 ℃; in the six-pass rolling process, the roller spacing from the first pass to the sixth pass is 60mm, 45mm, 32mm, 15mm, 6mm and 2.3mm in sequence; in the six-pass rolling process, the reduction ratios from the first pass to the sixth pass are as follows: 25%, 28.9%, 53.1%, 60.0% and 61.7%;
(3) placing the steel rolled in the sixth pass in the step (2) in a continuous water cooling device for cooling, wherein the water cooling speed is 18.2 ℃, the water outlet temperature of the steel after passing through the water cooling device is 467-479 ℃, and after the temperature of the steel is reduced to be consistent with the water outlet temperature, carrying out air cooling to room temperature;
the steel ingot comprises the following components: 0.0687 wt.% C, 0.505 wt.% Si, 1.236 wt.% Mn, 0.0514 wt.% P, 0.0264 wt.% Al, 0.1617 wt.% Cu, 0.0625 wt.% Nb, 0.0033 wt.% S, 0.0023wt.% N, 0.0015wt.% Ti, 0.0022wt.% Sn, 0.001wt.% B, the balance being iron and unavoidable impurities.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101356295A (en) * 2005-11-09 2009-01-28 新日本制铁株式会社 Steel sheet for continuous cast enameling with highly excellent unsusceptibility to fishscaling and process for producing the same
CN102766822A (en) * 2012-07-27 2012-11-07 宝山钢铁股份有限公司 High-strength steel plate used for glass lining, and manufacturing method thereof
PT2067870T (en) * 2006-09-27 2016-12-30 Shin Nippon Seitetsu Kk (Nippon Steel Corporation) Enameling steel sheet highly excellent in unsusceptibility to fishscaling and process for producing the same

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Publication number Priority date Publication date Assignee Title
US20150267284A1 (en) * 2014-03-21 2015-09-24 Am/Ns Calvert Llc Methods for production of highly formable extra deep draw enameling steel -- product and process for manufacture thereof

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Publication number Priority date Publication date Assignee Title
CN101356295A (en) * 2005-11-09 2009-01-28 新日本制铁株式会社 Steel sheet for continuous cast enameling with highly excellent unsusceptibility to fishscaling and process for producing the same
PT2067870T (en) * 2006-09-27 2016-12-30 Shin Nippon Seitetsu Kk (Nippon Steel Corporation) Enameling steel sheet highly excellent in unsusceptibility to fishscaling and process for producing the same
CN102766822A (en) * 2012-07-27 2012-11-07 宝山钢铁股份有限公司 High-strength steel plate used for glass lining, and manufacturing method thereof

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* Cited by examiner, † Cited by third party
Title
"热轧工艺和合金成分对釉化用钢组织性能影响的研究";何磊;《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》;20180131(第1期);第11-12页第1.5.1节、第20页第2.3节、第26-27页第3.1节 *
何磊."热轧工艺和合金成分对釉化用钢组织性能影响的研究".《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》.2018,(第1期),第11-12页第1.5.1节、第20页第2.3节、第26-27页第3.1节. *

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