CN111485170A - Production method of low-hardness chilled carbon steel strip - Google Patents
Production method of low-hardness chilled carbon steel strip Download PDFInfo
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- CN111485170A CN111485170A CN202010257799.8A CN202010257799A CN111485170A CN 111485170 A CN111485170 A CN 111485170A CN 202010257799 A CN202010257799 A CN 202010257799A CN 111485170 A CN111485170 A CN 111485170A
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—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
Abstract
A production method of a low-hardness chilled carbon steel strip specifically comprises the following steps: designing components: the cold-hard carbon steel strip comprises the following main chemical components in percentage by mass: c: 0.020% -0.040%, Si: less than or equal to 0.030 percent, Mn: 0.10% -0.20%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Al: 0.020-0.050% of Fe and the balance of inevitable impurities and residual elements; the steel-making process comprises the following steps: the molten steel is subjected to desulfurization, converter smelting and refining, and then is subjected to continuous casting to produce a continuous casting slab, and the continuous casting slab is sent to a hot rolling heating furnace after finishing; the hot rolling process comprises the following steps: heating the plate blank to 1200-1240 ℃ in a heating furnace and then carrying out hot rolling; acid rolling process: naturally cooling the hot rolling raw material coil, and then re-uncoiling, pickling, cold rolling and coiling; and (3) finished product: the hardness of the obtained chilled carbon steel strip product is lower than that of the conventional chilled product, and the surface hardness of the product is less than or equal to 95 HRB.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a production method of a low-hardness chilled carbon steel strip.
Background
The hot rolled steel strip is taken as a raw material at normal temperature, and is subjected to cold continuous rolling after iron scales are removed by pickling, or the hot rolled pickled steel strip is directly subjected to continuous rolling, and the finished product is called a cold rolled hard steel strip, which is called a cold hard steel strip for short. Due to work hardening caused by the rolling process, the internal structure is not subjected to annealing and tempering treatment, so that the strength and the hardness of the cold-hard steel strip are increased rapidly, the toughness and the plasticity index are greatly reduced, and the mechanical processing performance is poor. Therefore, the standard generally requires that the hardness of the product of the cold-hardened steel strip is not lower than 85HRB in the delivery condition, and the hardness fluctuation is large, and the upper limit of the allowable range of the hardness is not set.
Cold-hardened carbon steels, such as SPCC, SPCD, DC01, are the most widely distributed and most abundant types of cold-rolled products in the steel market. After the cold-hard carbon steel strip is annealed, the product has better stamping formability, tensile and bending properties and wide application range, and is widely used in the fields of household appliances, automobile manufacturing industry, light industry and the like.
The hardness of the finished steel strip is generally over 90HRB, and the hardness of a part of coils is even over 100 HRB. However, more and more users purchase the chilled carbon steel strip products for special purposes, the over-high hardness of the conventional steel strip cannot meet the normal use of the users, and if the hardness of the steel strip is too high, cracking in the bending processing process of the users can be caused, so that the users of the category put forward the requirements of lower hardness and tighter index on the delivery conditions of the chilled carbon steel strip products. Aiming at the demand of low-hardness chilled carbon steel products in the current market, a new production method of the chilled carbon steel strip needs to be established, and the hardness of the products can be stably controlled in a smaller range.
Disclosure of Invention
The invention aims to provide a production method of a low-hardness chilled carbon steel strip, which controls the hardness of the chilled finished product to be 95HRB or below by designing the chemical components of the steel strip and hot rolling and cold rolling production processes, and is suitable for users with relevant hardness requirements on the chilled carbon steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of a low-hardness chilled carbon steel strip specifically comprises the following steps:
1) designing components: the cold-hard carbon steel strip comprises the following main chemical components in percentage by mass: c: 0.020% -0.040%, Si: less than or equal to 0.030 percent, Mn: 0.10% -0.20%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Al: 0.020-0.050% and the balance of Fe, inevitable impurities and residual elements.
2) The steel-making process comprises the following steps: the molten steel is subjected to desulfurization, converter smelting and refining, and then is subjected to continuous casting to produce a continuous casting slab, wherein the thickness of the continuous casting slab is 230mm, and the continuous casting slab is sent to a hot rolling heating furnace after finishing.
3) The hot rolling process comprises the following steps: heating the plate blank to 1200-1240 ℃ in a heating furnace and then carrying out hot rolling; the hot rolling is a 1+5+7 three-stage rolling process, specifically, a rough rolling R1 rolling mill is used for 1-pass rolling, a rough rolling R2 rolling mill is used for 5-pass reciprocating reversible rolling, and a finish rolling mill is used for 7-stand continuous rolling; the finish rolling temperature is 870-900 ℃; laminar cooling adopts a uniform cooling mode; the coiling temperature is 670-700 ℃; naturally cooling the hot rolled coil after coiling; and producing the hot rolling raw material coil with the thickness specification of 2.0 mm-5.5 mm.
4) Acid rolling process: after the hot rolling raw material coil is naturally cooled, the hot rolling raw material coil is uncoiled, pickled, cold rolled and coiled again, wherein a cold rolling mill adopts a 5-frame six-roller continuous rolling unit, the total cold rolling reduction rate is 55-81%, and cold and hard coils with the thickness of 0.4-2.5 mm are produced after cold rolling.
5) And (3) finished product: the hardness of the obtained chilled carbon steel strip product is lower than that of the conventional chilled product, and the surface hardness of the product is less than or equal to 95 HRB.
Specifically, the total cold rolling reduction of the cold-hard coil with the thickness of 0.4mm to 0.9mm is 70 percent to 81 percent; the total cold rolling reduction rate of the 0.9 mm-1.5 mm cold-hard coil is 62% -72%; the total cold rolling reduction rate of 1.5 mm-2.0 mm cold-hard coils is 60% -67%, and the total cold rolling reduction rate of 2.0 mm-2.5 mm cold-hard coils is 55% -64%.
The invention has the following beneficial effects: the invention relates to a production method of a low-hardness chilled carbon steel strip,
1. the invention produces the chilled carbon steel strip product with low hardness characteristic, the surface hardness of the product is stably controlled below 95HRB, and the chilled carbon steel strip product meets the chilled users with corresponding requirements on the market.
2. The individual requirements of the product performance are realized by adjusting the steel-making, hot rolling and cold rolling processes, other alloy elements and the like do not need to be added, and the production cost of the product is prevented from being improved.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
A production method of a low-hardness chilled carbon steel strip specifically comprises the following steps:
1) designing components: the cold-hard carbon steel strip comprises the following main chemical components in percentage by mass: c: 0.020% -0.040%, Si: less than or equal to 0.030 percent, Mn: 0.10% -0.20%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Al: 0.020-0.050% and the balance of Fe, inevitable impurities and residual elements.
2) The steel-making process comprises the following steps: the molten steel is subjected to desulfurization, converter smelting and refining, and then is subjected to continuous casting to produce a continuous casting slab, wherein the thickness of the continuous casting slab is 230mm, and the continuous casting slab is sent to a hot rolling heating furnace after finishing.
3) The hot rolling process comprises the following steps: heating the plate blank to 1200-1240 ℃ in a heating furnace and then carrying out hot rolling; the hot rolling is a 1+5+7 three-stage rolling process, specifically, a rough rolling R1 rolling mill is used for 1-pass rolling, a rough rolling R2 rolling mill is used for 5-pass reciprocating reversible rolling, and a finish rolling mill is used for 7-stand continuous rolling; the finish rolling temperature is 870-900 ℃; laminar cooling adopts a uniform cooling mode; the coiling temperature is 670-700 ℃; naturally cooling the hot rolled coil after coiling; and producing the hot rolling raw material coil with the thickness specification of 2.0 mm-5.5 mm.
4) Acid rolling process: after the hot rolling raw material coil is naturally cooled, the hot rolling raw material coil is uncoiled, pickled, cold rolled and coiled again, wherein a cold rolling mill adopts a 5-frame six-roller continuous rolling unit, the total cold rolling reduction rate is 55-81%, and cold and hard coils with the thickness of 0.4-2.5 mm are produced after cold rolling.
5) And (3) finished product: the hardness of the obtained chilled carbon steel strip product is lower than that of the conventional chilled product, and the surface hardness of the product is less than or equal to 95 HRB.
The total cold rolling reduction rate of the cold-hard coil of 0.4 mm-0.9 mm is 70% -81%; the total cold rolling reduction rate of the 0.9 mm-1.5 mm cold-hard coil is 62% -72%; the total cold rolling reduction rate of 1.5 mm-2.0 mm cold-hard coils is 60% -67%, and the total cold rolling reduction rate of 2.0 mm-2.5 mm cold-hard coils is 55% -64%.
The production method of the low-hardness chilled carbon steel strip provided by the invention adopts the following steps:
in the above production method, the step 1) is a component design, because the material properties are one of the main factors influencing the hardness of the cold-hard steel strip, and the component design is the basis for determining the material properties of the steel strip.
Further, since the chemical composition in the step 1) is set within the above range, the C content range is set to 0.020% to 0.040%, the Si content range is set to 0.030% or less, and the Mn content range is set to 0.10% to 0.20%, because C, Si, and Mn are main strengthening elements in the composition of the general cold-rolled carbon steel strip and the content of C, Si, and Mn is directly influenced on the hardness of the cold-hardened product.
In the above production method, the hot rolling process in said step 3) is mainly set to a temperature system because the properties of the raw material are one of the main factors affecting the hardness of the cold-hardened steel strip, and the hot rolling temperature is one of the main factors affecting the properties of the raw material. Under the same conditions of other processes, the higher the strength of the raw material, the higher the strength and hardness of the cold-hardened steel strip after cold rolling.
Furthermore, the high finish rolling temperature is set in the step 3), so that the phenomenon of internal mixed crystals of the raw materials caused by the fact that the hot rolling finish rolling outlet temperature is too low and the raw materials enter a two-phase region for rolling in advance is avoided, and the fluctuation of the strength of the raw materials is reduced.
Further, the step 3) is designed to be in a uniform laminar cooling mode, because the hot rolling raw material is uniformly cooled, the internal stress can be reduced, the plate shape control level can be improved, and meanwhile, the phenomenon that the cooling time of a high-temperature section stays too long is avoided, so that the plate shape and the surface quality of the hot rolling raw material are considered.
Further, the high hot rolling coiling temperature set in the step 3) can coarsen ferrite grains of the finished hot rolled strip and coarsen carbides due to aggregation, thereby lowering the strength index of the hot rolled material.
In the production method, the cold rolling process in the step 4) is mainly set to the total reduction rate, because the total reduction rate of cold rolling is one of the main factors influencing the mechanical properties of the cold-hard steel strip, and the process parameters such as cold rolling tension, cold rolling speed, cold rolling bending force, emulsion concentration and the like basically have no influence on the hardness of the cold-rolled steel strip.
Furthermore, in the step 4), the reduction rate of each pass of cold rolling is not considered, and the hardness of the finished cold-hard steel strip is not obviously influenced due to the fact that the raw materials under the same conditions, such as the total reduction rate of cold rolling is the same, but the reduction rates of the passes are different.
Furthermore, the total cold rolling reduction rate set in the step 4) is reduced compared with that of a conventional carbon steel product, and the hardness of a corresponding cold-hard steel strip finished product is reduced when the total cold rolling reduction rate of other raw materials under the same condition is smaller.
Example 1
A furnace of molten steel with chemical components meeting the requirements is obtained after KR desulfurization, converter smelting and RH refining, and the specific components are shown in Table 1. And continuously casting the molten steel to produce a plate blank, wherein the thickness of the plate blank is 230 mm.
And (2) feeding the continuously cast plate blank into a hot rolling heating furnace for furnace charging and heating, wherein the heating temperature is 1240 ℃, the plate blank is discharged from the furnace and is subjected to '1 +5+ 7' pass rolling through a rough rolling double-rack R1+ R2 rolling mill and a finish rolling seven-rack continuous rolling unit, the pass reduction rate is automatically calculated by a model, the finish rolling temperature is 886 ℃, laminar cooling adopts uniform cooling, and finally the plate blank enters a hot rolling coiler at 681 ℃ to produce a hot rolling coil with the thickness of 2.5 mm.
And naturally cooling the hot rolled coil, uncoiling the coil again, carrying out acid pickling, carrying out continuous cold rolling on the coil in a five-rack six-roller cold continuous rolling mill for one time, wherein the total rolling reduction of the cold rolling is 76.0%, the rolling reduction of each rack is automatically calculated by a model, and coiling the coil after the cold rolling to obtain a cold-hard coil with the thickness of 0.6 mm.
The surface hardness of the cold-hard carbon steel strip obtained by the method is 89.5HRB, and the specific conditions are shown in Table 2.
Example 2
KR desulfurization, converter smelting and L F refining are carried out to obtain a furnace of molten steel with required chemical components, the specific components are shown in Table 1, the molten steel is continuously cast to produce a plate blank, and the thickness of the plate blank is 230 mm.
And (2) feeding the continuously cast plate blank into a hot rolling heating furnace for furnace charging and heating, wherein the heating temperature is 1230 ℃, discharging the plate blank, carrying out 1+5+ 7-pass rolling through a rough rolling double-rack R1+ R2 rolling mill and a finish rolling seven-rack continuous rolling unit, automatically calculating pass reduction rate by a model, wherein the finish rolling temperature is 882 ℃, carrying out laminar cooling by uniform cooling, and finally entering a hot rolling coiler at 686 ℃ to produce a hot rolling coil with the thickness of 3.2 mm.
And naturally cooling the hot-rolled coil, uncoiling the coil again, carrying out acid pickling, carrying out continuous cold rolling on the coil in a five-rack six-roller cold continuous rolling mill for one time, wherein the total rolling reduction of the cold rolling is 70.3%, the rolling reduction of each rack is automatically calculated by a model, and coiling the coil after the cold rolling to obtain a cold-hard coil with the thickness of 0.95 mm.
The surface hardness of the finished product of the cold-hard carbon steel strip obtained by the method is 92.9 HRB. The details thereof are shown in Table 2.
Example 3
A furnace of molten steel with chemical components meeting the requirements is obtained after KR desulfurization, converter smelting and RH refining, and the specific components are shown in Table 1. And continuously casting the molten steel to produce a plate blank, wherein the thickness of the plate blank is 230 mm.
And (2) feeding the continuously cast plate blank into a hot rolling heating furnace for furnace charging and heating, wherein the heating temperature is 1220 ℃, the plate blank is discharged from the furnace and is subjected to '1 +5+ 7' pass rolling through a rough rolling double-rack R1+ R2 rolling mill and a finish rolling seven-rack continuous rolling unit, the pass reduction rate is automatically calculated by a model, the finish rolling temperature is 891 ℃, laminar cooling adopts uniform cooling, and finally the plate blank enters a hot rolling coiler at 689 ℃ to produce a hot rolling coil with the thickness of 3.5 mm.
And naturally cooling the hot-rolled coil, uncoiling the coil again, carrying out acid pickling, carrying out continuous cold rolling on the coil in a five-rack six-roller cold continuous rolling mill for one time, wherein the total rolling reduction of the cold rolling is 66.3%, the rolling reduction of each rack is automatically calculated by a model, and the cold-rolled coil is coiled to obtain a cold-hard coil with the thickness of 1.18 mm.
The surface hardness of the finished product of the cold-hard carbon steel strip obtained by the method is 91.9 HRB. The specific properties are shown in Table 2.
TABLE 1 Main chemical composition Table of molten steel in examples 1 to 3
| Element/%) | C | Si | Mn | P | S | Al |
| The invention | 0.020～0.040 | ≤0.030 | 0.10～0.20 | ≤0.020 | ≤0.020 | 0.020～0.050 |
| Example 1 | 0.032 | 0.010 | 0.12 | 0.010 | 0.011 | 0.035 |
| Example 2 | 0.030 | 0.008 | 0.16 | 0.013 | 0.008 | 0.026 |
| Example 3 | 0.025 | 0.009 | 0.14 | 0.007 | 0.005 | 0.041 |
TABLE 2 Performance of the finished steel strip in examples 1-3
Claims (2)
1. The production method of the low-hardness chilled carbon steel strip is characterized by comprising the following steps:
1) designing components: the cold-hard carbon steel strip comprises the following main chemical components in percentage by mass: c: 0.020% -0.040%, Si: less than or equal to 0.030 percent, Mn: 0.10% -0.20%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Al: 0.020-0.050% and the balance of Fe, inevitable impurities and residual elements.
2) The steel-making process comprises the following steps: the molten steel is subjected to desulfurization, converter smelting and refining, and then is subjected to continuous casting to produce a continuous casting slab, wherein the thickness of the continuous casting slab is 230mm, and the continuous casting slab is sent to a hot rolling heating furnace after finishing.
3) The hot rolling process comprises the following steps: heating the plate blank to 1200-1240 ℃ in a heating furnace and then carrying out hot rolling; the hot rolling is a 1+5+7 three-stage rolling process, specifically, a rough rolling R1 rolling mill is used for 1-pass rolling, a rough rolling R2 rolling mill is used for 5-pass reciprocating reversible rolling, and a finish rolling mill is used for 7-stand continuous rolling; the finish rolling temperature is 870-900 ℃; laminar cooling adopts a uniform cooling mode; the coiling temperature is 670-700 ℃; naturally cooling the hot rolled coil after coiling; and producing the hot rolling raw material coil with the thickness specification of 2.0 mm-5.5 mm.
4) Acid rolling process: after the hot rolling raw material coil is naturally cooled, the hot rolling raw material coil is uncoiled, pickled, cold rolled and coiled again, wherein a cold rolling mill adopts a 5-frame six-roller continuous rolling unit, the total cold rolling reduction rate is 55-81%, and cold and hard coils with the thickness of 0.4-2.5 mm are produced after cold rolling.
5) And (3) finished product: the hardness of the obtained chilled carbon steel strip product is lower than that of the conventional chilled product, and the surface hardness of the product is less than or equal to 95 HRB.
2. The method for producing a low-hardness chilled carbon steel strip according to claim 1, wherein the total reduction of cold rolling of 0.4mm to 0.9mm chilled coils is 70% to 81%; the total cold rolling reduction rate of the 0.9 mm-1.5 mm cold-hard coil is 62% -72%; the total cold rolling reduction rate of 1.5 mm-2.0 mm cold-hard coils is 60% -67%, and the total cold rolling reduction rate of 2.0 mm-2.5 mm cold-hard coils is 55% -64%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112126854A (en) * | 2020-09-11 | 2020-12-25 | 山东钢铁集团日照有限公司 | Production method of cold-rolled base plate of tin-plated plate |
| CN112157135A (en) * | 2020-09-07 | 2021-01-01 | 山东钢铁集团日照有限公司 | Production method of economical cold-rolled steel plate for water heater water tank outer plate |
| CN112795845A (en) * | 2020-12-31 | 2021-05-14 | 江苏沙钢集团有限公司 | Semi-hard steel coil and preparation method thereof |
| CN114635088A (en) * | 2022-03-21 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Cold-rolled sheet for household appliance panel |
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| CN114635088A (en) * | 2022-03-21 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Cold-rolled sheet for household appliance panel |
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Application publication date: 20200804 |