CN111549281A - Cold-rolled steel strip for high-hardness hardware and production method thereof - Google Patents
Cold-rolled steel strip for high-hardness hardware and production 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
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Abstract
The invention discloses a cold-rolled steel strip for high-hardness hardware and a production method thereof, wherein the production method comprises the following production steps: production of cold-rolled feedstock by hot rolling: hot rolling by adopting a 7-frame hot continuous rolling mill; acid washing with hydrochloric acid: pickling with a 1580mm shallow groove turbulent flow push-pull type hydrochloric acid pickling machine set to prepare a pickled steel strip; first cold rolling: performing first cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill; annealing: annealing in a 100t strong convection all-hydrogen bright cover type annealing furnace; and (3) second cold rolling: performing secondary cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill; straightening the plate shape and oiling: uncoiling and coiling the steel strip by a 1580mm stretch bending straightener, and coating anti-rust oil by an electrostatic oiling machine to prepare the cold-rolled steel strip for the high-hardness hardware. The invention does not need a leveling procedure, has low production cost and simplified equipment; the thickness precision of the product is high, and the use requirement of high-hardness hardware is met.
Description
Technical Field
The invention relates to an improvement of a production method of a quarter hard cold-rolled steel strip, in particular to a cold-rolled steel strip for high-hardness hardware and a production method thereof.
Background
The quarter hard cold-rolled steel strip is mainly used for high-hardness hardware, and strong demands are made on cold-rolled products for the high-hardness hardware along with popularization of the fashion concept of China, improvement of the living standard of people's materials and acceleration of the domestic urbanization process. In order to meet the requirement of light weight of hardware, the thickness of the cold-rolled steel strip is required to be reduced, and the cold-rolled steel strip has high thickness precision, high hardness and good forming performance so as to meet the safety requirement; if the cold-hard steel strip is adopted, although the requirement of high hardness can be met, the strong deformation strengthening effect is not beneficial to the bending and forming requirements of the material. At present, the prominent problem of the quarter hard cold-rolled steel strip is that the hardness of the product is low and uneven, and the component is easy to break and deform, so that the product cannot be normally used by customers; the quarter hard cold-rolled steel strip adopts two production processes, one is a continuous annealing process, and the hardness is improved by a method of extremely high cooling speed, so that the problems of high production difficulty, easy strip breakage, high annealing temperature, high energy consumption, rapid cooling at high temperature, large internal stress, easy warping, poor plate shape and influence on shearing, strip splitting and forming exist; the other method is to adopt low cooling speed, but more precious alloy needs to be added to achieve the purpose of improving the hardness, so that the production cost is high and the welding performance is poor.
Disclosure of Invention
The invention aims to provide a cold-rolled steel strip for high-hardness hardware, which has excellent physical properties and is suitable for producing high-hardness hardware, and is produced by adopting a method of pickling by a 1580mm push-pull pickling unit, primary cold rolling by a 1700mm single-rack six-roller reversible cold rolling mill, annealing by a 100t full-hydrogen bright cover annealing furnace, secondary cold rolling by a 1700mm single-rack six-roller reversible cold rolling mill and straightening of a 1580mm stretch bending straightening unit, wherein the steel strip has bright surface, flat and straight shape, high dimensional precision, tensile strength of 550 MPa-600 MPa, Hardness (HRB) of 65-80 and thickness of 0.50 mm-0.7 mm.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: this high rigidity is cold rolled steel strip for hardware, its characterized in that: the thickness of the cold-rolled steel strip for the high-hardness hardware is 0.50-0.70 mm, and the tensile strength is as follows: 550MPa to 600 MPa; hardness (HRB) 65-80; the chemical components and the mass percentage are as follows: 0.03-0.04% of C, Si: 0.010-0.020%, Mn: 0.15% -0.20%, P is 0.005% -0.020%, S: 0.005% -0.015%, Als: 0.02-0.05%, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities.
The invention also aims to provide a production method of the cold-rolled steel strip for the high-hardness hardware.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the production method of the cold-rolled steel strip for the high-hardness hardware is characterized by comprising the following steps of: the method comprises the following production steps:
(1) producing a cold rolling raw material by hot rolling: the produced molten iron is subjected to desulfurization, converter smelting, LF furnace refining and continuous casting to form a casting blank; hot rolling by adopting a 7-frame hot continuous rolling mill, wherein the final rolling temperature is controlled as follows: 850-890 ℃, and the coiling temperature is controlled as follows: controlling the temperature of 630-670 ℃ by adopting a 'three-high one-low' process, so that the yield strength of the cold-rolled raw material is 260-310 MPa, the tensile strength is 340-380 MPa, and the elongation after fracture is more than or equal to 44%; no crack is generated by cold bending at 180 degrees; preparing a cold rolling raw material with the thickness of 3.00 mm-3.25 mm;
the cold rolling raw material comprises the following chemical components in percentage by mass: 0.03-0.04% of C, Si: 0.010-0.020%, Mn: 0.15% -0.20%, P is 0.005% -0.020%, S: 0.005% -0.015%, Als: 0.02-0.05%, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities;
(2) and hydrochloric acid pickling: pickling the cold-rolled raw material by adopting a 1580mm shallow slot turbulent flow push-pull type hydrochloric acid pickling machine to remove iron oxide scales on the surface of the cold-rolled raw material so as to prepare a pickled steel strip;
(3) and first cold rolling: carrying out first cold rolling on the acid-washed steel strip by a 1700mm single-stand six-roller reversible cold rolling mill to roll a cold-rolled steel strip semi-finished product with the thickness of 0.77 mm-0.99 mm; the hardness of a roll body of a roll of the 1700mm single-rack six-roll reversible cold rolling mill is 91 HSD-93 HSD, the concentration of emulsion is 1.5% -2.0%, and emulsion is sprayed by an emulsion spray beam of DN80mm and an 4903 type emulsion nozzle so as to improve the process lubrication effect; the 1700mm single-stand six-roller reversible cold rolling mill adopts Siemens S7-400PLC system and FM458 process module control technology to realize high-precision control of thickness, and thickness deviation is controlled to be-0.01 mm-0 mm;
(4) and annealing: annealing the semi-finished cold-rolled steel strip in a 100t strong convection all-hydrogen bright cover type annealing furnace to obtain an annealed product; the annealing temperature of the 100t strong convection total hydrogen bright hood type annealing furnace is controlled between 650 ℃ and 670 ℃, and the heat preservation time is controlled between 12h and 14 h; the 100t strong convection all-hydrogen bright hood-type annealing furnace adopts Siemens S7-300PLC automatic control technology to realize the fluctuation control of the annealing temperature within the range of 5 ℃;
(5) and second cold rolling: the annealed product is subjected to secondary cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill, the last pass thickness is controlled to be 0.495 mm-0.695 mm, and a cold-rolled steel strip with the thickness of 0.50 mm-0.70 mm is rolled; the hardness of a roll body of a roll of the 1700mm single-stand six-roll reversible cold rolling mill is 94 HSD-96 HSD, and the concentration of emulsion is 2.0% -3.0%;
(6) straightening the plate shape and oiling: uncoiling and coiling the cold-rolled steel strip on a 1580mm stretch bending straightener until the unevenness is less than or equal to 1 mm; and in the uncoiling and coiling processes, coating antirust oil on the upper surface and the lower surface of the cold-rolled steel strip by using an electrostatic oiling machine to prepare the cold-rolled steel strip for the high-hardness hardware.
The invention is also implemented by the following measures:
in the step (2), the hydrochloric acid washing tank of the 1580mm shallow-groove turbulent flow push-pull type hydrochloric acid washing unit comprises a 1# acid tank, a 2# acid tank, a 3# acid tank, a 4# acid tank, a 5# acid tank and a 6# acid tank, wherein the 6 acid tanks are connected in series and are independent from each other, wherein: the hydrochloric acid temperature in the No. 1 acid tank is controlled to be 75-85 ℃, the concentration of ferrous ions in hydrochloric acid is less than 130g/l, and the concentration of HCl in hydrochloric acid is controlled to be 60-140 g/l; controlling the hydrochloric acid temperature in the 2# acid tank to be between 70 and 85 ℃; controlling the hydrochloric acid temperature in the 3# acid tank to be 70-80 ℃; controlling the hydrochloric acid temperature in the 4# acid tank at 65-75 ℃; controlling the temperature of hydrochloric acid in the No. 5 acid tank to be 60-75 ℃; controlling the hydrochloric acid temperature in the No. 6 acid tank to be 60-80 ℃, controlling the concentration of ferrous ions in hydrochloric acid to be 10-60 g/l, and controlling the concentration of HCl in hydrochloric acid to be 160-240 g/l so as to remove iron oxide scales on the surface of the cold rolling raw material; the temperature of rinsing water in the rinsing tank is controlled to be 75-85 ℃, the conductivity of the rinsing water is controlled to be less than or equal to 200 mu s/cm, and the content of chloride ions is controlled to be less than or equal to 100mg/l, so that residual hydrochloric acid on the plate surface is cleaned, and the surface quality of acid washing is improved.
In the step (4), when the 100t strong convection all-hydrogen bright hood-type annealing furnace is used for annealing, the temperature rising rate is controlled to be 110 ℃/h when the temperature rises from 250 ℃ to 450 ℃ to 470 ℃, and the temperature is kept for 2h to 4h when the temperature reaches 450 ℃ to 470 ℃; heating again, wherein the heating rate is controlled to be 35-50 ℃/h when the temperature is increased from 450-470 ℃ to 650-670 ℃, and the temperature is kept for 12-14 h when the temperature reaches 650-670 ℃; in the temperature rising stage, the flow rate of hydrogen purging is controlled to be 30-40 cubic meters per hour; when cooling, firstly air-cooling to 350-370 ℃, then cooling to 85-95 ℃ by spray water, and discharging.
The 7-frame hot continuous rolling mill, the 1580mm shallow groove turbulent flow push-pull type hydrochloric acid pickling unit, the 1700mm single-frame six-roller reversible cold rolling mill, the 100t strong convection all-hydrogen bright cover type annealing furnace, the 1580mm stretch bending straightening machine and the electrostatic oiling machine are all conventional equipment, so that the equipment is not multiple.
The detection shows that the cold-rolled steel strip for the high-hardness hardware produced by the method has the main technical indexes that: the thickness is 0.50 mm-0.70 mm; thickness deviation: -0.01 mm-0 mm; tensile strength is 550 MPa-600 MPa; hardness (HRB) 65-80; the shape of the plate is flat and straight, and the unevenness is less than or equal to 1 mm; the surface is uniform and consistent, and has no defects of bubbles, oil stains, impurities, stripes, chromatic aberration and the like; the product is qualified.
The invention has the beneficial effects that: compared with the existing quarter hard cold-rolled steel strip production method, the method has the advantages that the physical properties of the product are excellent, the tensile strength reaches 550 MPa-600 MPa, and the Hardness (HRB) reaches 65-80, and the product is subjected to primary cold rolling by a 1700mm single-stand six-roller reversible cold-rolling mill, annealed by a 100t strong-convection all-hydrogen bright cover type annealing furnace, then subjected to secondary cold rolling by the 1700mm single-stand six-roller reversible cold-rolling mill, and does not undergo a leveling process, so that the production cost is low, and the equipment is simplified; moreover, the thickness precision of the product is high, and the thickness deviation is-0.01 mm-0 mm; the shape of the plate is flat and straight, and the unevenness is less than or equal to 1 mm; the surface is uniform and consistent, the defects of bubbles, oil stains, impurities, stripes, color difference and the like are avoided, the use requirement of high-hardness hardware is met, and the manufactured high-hardness hardware has higher hardness, is more wear-resistant, prolongs the service life and has wide market prospect.
Detailed Description
Example 1: within this company, cold-rolled steel strips for high-hardness hardware with a thickness of 0.50mm are produced.
This high rigidity is cold rolled steel strip for hardware, its characterized in that: the thickness of the cold-rolled steel strip for the high-hardness hardware is 0.50mm, and the tensile strength is as follows: 550 MPa; hardness (HRB) 65; the chemical components and the mass percentage are as follows: 0.03% of C, Si: 0.010%, Mn: 0.15%, P0.005%, S: 0.005%, Als: 0.02 percent, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities.
The production method of the cold-rolled steel strip for the high-hardness hardware is characterized by comprising the following steps of: the method comprises the following production steps:
(1) producing a cold rolling raw material by hot rolling: the produced molten iron is subjected to desulfurization, converter smelting, LF furnace refining and continuous casting to form a casting blank; hot rolling by adopting a 7-frame hot continuous rolling mill, wherein the final rolling temperature is controlled as follows: and (3) controlling the coiling temperature at 850 ℃ as follows: controlling by adopting a 'three-high one-low' process at 630 ℃ to ensure that the yield strength of the cold-rolled raw material is 260MPa, the tensile strength is 340MPa and the elongation after fracture is 44%; no crack is generated by cold bending at 180 degrees; preparing a cold rolling raw material with the thickness of 3.00 mm;
the cold rolling raw material comprises the following chemical components in percentage by mass: 0.03% of C, Si: 0.010%, Mn: 0.15%, P0.005%, S: 0.005%, Als: 0.02 percent, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities;
(2) and hydrochloric acid pickling: pickling the cold-rolled raw material by adopting a 1580mm shallow slot turbulent flow push-pull type hydrochloric acid pickling machine to remove iron oxide scales on the surface of the cold-rolled raw material so as to prepare a pickled steel strip;
the hydrochloric acid pickling tank of the 1580mm shallow groove turbulent flow push-pull type hydrochloric acid pickling unit comprises a 1# acid tank, a 2# acid tank, a 3# acid tank, a 4# acid tank, a 5# acid tank and a 6# acid tank, wherein the 6 acid tanks are connected in series and are independent of each other, wherein: the hydrochloric acid temperature in the No. 1 acid tank is controlled at 75 ℃, the concentration of ferrous ions in hydrochloric acid is 127g/l, and the concentration of HCl in hydrochloric acid is controlled at 60 g/l; controlling the hydrochloric acid temperature in the 2# acid tank at 70 ℃; controlling the hydrochloric acid temperature in the 3# acid tank at 70 ℃; controlling the hydrochloric acid temperature in the 4# acid tank at 65 ℃; controlling the temperature of hydrochloric acid in the 5# acid tank at 60 ℃; controlling the hydrochloric acid temperature in the No. 6 acid tank at 60 ℃, controlling the concentration of ferrous ions in hydrochloric acid at 60g/l, and controlling the concentration of HCl in hydrochloric acid at 240g/l to remove iron scales on the surface of the cold-rolled raw material; the temperature of rinsing water in the rinsing tank is controlled at 75 ℃, the conductivity of the rinsing water is controlled at 200 mu s/cm, the content of chloride ions is controlled at 100mg/l, so that residual hydrochloric acid on the surface of the plate is cleaned, and the quality of the acid-washed surface is improved;
(3) and first cold rolling: carrying out first cold rolling on the acid-washed steel strip by a 1700mm single-stand six-roller reversible cold rolling mill to roll a cold-rolled steel strip semi-finished product with the thickness of 0.77 mm; the hardness of the roll body of the roll of the 1700mm single-stand six-roll reversible cold-rolling mill is 93HSD, the concentration of the emulsion is 2.0 percent, and the emulsion is sprayed by an emulsion spray beam of DN80mm and an emulsion nozzle of 4903 type, so that the process lubrication effect is improved; the 1700mm single-stand six-roller reversible cold rolling mill adopts Siemens S7-400PLC system and FM458 process module control technology to realize high-precision control of thickness, and thickness deviation is controlled to be-0.01 mm-0 mm;
(4) and annealing: annealing the semi-finished cold-rolled steel strip in a 100t strong convection all-hydrogen bright cover type annealing furnace to obtain an annealed product; the annealing temperature of the 100t strong convection all-hydrogen bright hood-type annealing furnace is controlled at 650 ℃, and the heat preservation time is controlled at 14 h; the 100t strong convection all-hydrogen bright hood-type annealing furnace adopts Siemens S7-300PLC automatic control technology to realize the fluctuation control of the annealing temperature within the range of 5 ℃;
when the 100t strong convection all-hydrogen bright hood-type annealing furnace is used for annealing, the heating rate is controlled at 110 ℃/h when the temperature is increased from 250 ℃ to 470 ℃, and the temperature is kept for 4h when the temperature reaches 470 ℃; heating again, wherein the heating rate is controlled to be 35 ℃/h when the temperature is increased from 470 ℃ to 650 ℃, and the temperature is kept for 14h when the temperature reaches 650 ℃; in the temperature rising stage, the flow rate of hydrogen purging is controlled at 40 cubic meters per hour; when cooling, firstly air cooling to 350 ℃, then cooling to 85 ℃ by spray water, and discharging;
(5) and second cold rolling: the annealed product is subjected to secondary cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill, the last pass thickness is controlled to be 0.495mm, and a cold-rolled steel strip with the thickness of 0.50mm is rolled; the hardness of the roll body of the roll of the 1700mm single-stand six-roll reversible cold rolling mill is 96HSD, and the concentration of the emulsion is 3.0 percent;
(6) straightening the plate shape and oiling: uncoiling and coiling the cold-rolled steel strip on a 1580mm stretch bending straightener until the unevenness is less than or equal to 1 mm; and in the uncoiling and coiling processes, coating antirust oil on the upper surface and the lower surface of the cold-rolled steel strip by using an electrostatic oiling machine to prepare the cold-rolled steel strip for the high-hardness hardware.
The 7-frame hot continuous rolling mill, the 1580mm shallow groove turbulent flow push-pull type hydrochloric acid pickling unit, the 1700mm single-frame six-roller reversible cold rolling mill, the 100t strong convection all-hydrogen bright cover type annealing furnace, the 1580mm stretch bending straightening machine and the electrostatic oiling machine are all conventional equipment, so that the equipment is not multiple.
Through detection, the main technical indexes are as follows: the thickness is 0.50 mm; thickness deviation: -0.01 mm-0 mm; tensile strength is 550 MPa; hardness (HRB) 65; the shape of the plate is flat and straight, and the unevenness is less than or equal to 1 mm; the surface is uniform and consistent, and has no defects of bubbles, oil stains, impurities, stripes, chromatic aberration and the like; the product is qualified.
Example 2: within this company, cold-rolled steel strip for high-hardness hardware having a thickness of 0.60mm was produced.
This high rigidity is cold rolled steel strip for hardware, its characterized in that: the thickness of the cold-rolled steel strip for the high-hardness hardware is 0.60mm, and the tensile strength is as follows: 580 MPa; hardness (HRB) 79; the chemical components and the mass percentage are as follows: 0.035% of C, Si: 0.018%, Mn: 0.17%, P0.016%, S: 0.012%, Als: 0.03 percent, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities.
The production method of the cold-rolled steel strip for the high-hardness hardware is characterized by comprising the following steps of: the method comprises the following production steps:
(1) producing a cold rolling raw material by hot rolling: the produced molten iron is subjected to desulfurization, converter smelting, LF furnace refining and continuous casting to form a casting blank; hot rolling by adopting a 7-frame hot continuous rolling mill, wherein the final rolling temperature is controlled as follows: 870 ℃, the coiling temperature is controlled as follows: controlling by adopting a 'three-high one-low' process at 650 ℃ to ensure that the yield strength of the cold-rolled raw material is 276MPa, the tensile strength is 368MPa and the elongation after fracture is 45 percent; no crack is generated by cold bending at 180 degrees; preparing a cold rolling raw material with the thickness of 3.15 mm;
the cold rolling raw material comprises the following chemical components in percentage by mass: 0.035% of C, Si: 0.018%, Mn: 0.17%, P0.016%, S: 0.012%, Als: 0.03 percent, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities;
(2) and hydrochloric acid pickling: pickling the cold-rolled raw material by adopting a 1580mm shallow slot turbulent flow push-pull type hydrochloric acid pickling machine to remove iron oxide scales on the surface of the cold-rolled raw material so as to prepare a pickled steel strip;
the hydrochloric acid pickling tank of the 1580mm shallow groove turbulent flow push-pull type hydrochloric acid pickling unit comprises a 1# acid tank, a 2# acid tank, a 3# acid tank, a 4# acid tank, a 5# acid tank and a 6# acid tank, wherein the 6 acid tanks are connected in series and are independent of each other, wherein: the hydrochloric acid temperature in the No. 1 acid tank is controlled at 80 ℃, the concentration of ferrous ions in hydrochloric acid is 124g/l, and the concentration of HCl in hydrochloric acid is controlled at 73 g/l; controlling the hydrochloric acid temperature in the 2# acid tank at 76 ℃; controlling the hydrochloric acid temperature in the 3# acid tank at 74 ℃; controlling the hydrochloric acid temperature in the 4# acid tank at 69 ℃; controlling the hydrochloric acid temperature in the 5# acid tank at 65 ℃; controlling the hydrochloric acid temperature in the No. 6 acid tank at 63 ℃, controlling the concentration of ferrous ions in hydrochloric acid at 52g/l and controlling the concentration of HCl in hydrochloric acid at 216g/l so as to remove iron scales on the surface of the cold-rolled raw material; the temperature of rinsing water in the rinsing tank is controlled at 82 ℃, the conductivity of the rinsing water is controlled at 187 mu s/cm, and the content of chloride ions is controlled at 74mg/l, so that residual hydrochloric acid on the plate surface is cleaned, and the quality of the acid-washed surface is improved;
(3) and first cold rolling: carrying out first cold rolling on the acid-washed steel strip by a 1700mm single-stand six-roller reversible cold rolling mill to roll a cold-rolled steel strip semi-finished product with the thickness of 0.88 mm; the hardness of the roll body of the roll of the 1700mm single-stand six-roll reversible cold-rolling mill is 92HSD, the concentration of the emulsion is 1.8%, and the emulsion is sprayed by using an emulsion spray beam of DN80mm and a 4903 type emulsion nozzle so as to improve the process lubrication effect; the 1700mm single-stand six-roller reversible cold rolling mill adopts Siemens S7-400PLC system and FM458 process module control technology to realize high-precision control of thickness, and thickness deviation is controlled to be-0.01 mm-0 mm;
(4) and annealing: annealing the semi-finished cold-rolled steel strip in a 100t strong convection all-hydrogen bright cover type annealing furnace to obtain an annealed product; the annealing temperature of the 100t strong convection all-hydrogen bright hood-type annealing furnace is controlled at 660 ℃, and the heat preservation time is controlled at 13 h; the 100t strong convection all-hydrogen bright hood-type annealing furnace adopts Siemens S7-300PLC automatic control technology to realize the fluctuation control of the annealing temperature within the range of 5 ℃;
when the 100t strong convection all-hydrogen bright hood-type annealing furnace is used for annealing, the heating rate is controlled at 110 ℃/h when the temperature is increased from 250 ℃ to 460 ℃, and the temperature is kept for 3h when the temperature reaches 460 ℃; heating again, wherein the heating rate is controlled to be 40 ℃/h when the temperature is increased from 460 ℃ to 660 ℃, and the temperature is kept for 13h when the temperature reaches 660 ℃; in the temperature rising stage, the flow rate of hydrogen purging is controlled at 35 cubic meters per hour; when cooling, firstly air-cooling to 360 ℃, then cooling to 90 ℃ by spray water, and discharging;
(5) and second cold rolling: the annealed product is subjected to secondary cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill again, the final thickness is controlled to be 0.595mm, and a cold-rolled steel strip with the thickness of 0.60mm is rolled; the hardness of the roll body of the roll of the 1700mm single-stand six-roll reversible cold rolling mill is 95HSD, and the concentration of the emulsion is 2.6 percent;
(6) straightening the plate shape and oiling: uncoiling and coiling the cold-rolled steel strip on a 1580mm stretch bending straightener until the unevenness is less than or equal to 1 mm; and in the uncoiling and coiling processes, coating antirust oil on the upper surface and the lower surface of the cold-rolled steel strip by using an electrostatic oiling machine to prepare the cold-rolled steel strip for the high-hardness hardware.
Through detection, the main technical indexes are as follows: the thickness is 0.60 mm; thickness deviation: -0.01 mm-0 mm; tensile strength is 581 MPa; hardness (HRB) 74; the shape of the plate is flat and straight, and the unevenness is less than or equal to 1 mm; the surface is uniform and consistent, and has no defects of bubbles, oil stains, impurities, stripes, chromatic aberration and the like; the product is qualified.
Example 3: within this company, cold-rolled steel strips for high-hardness hardware with a thickness of 0.70mm are produced.
This high rigidity is cold rolled steel strip for hardware, its characterized in that: the thickness of the cold-rolled steel strip for the high-hardness hardware is 0.70mm, and the tensile strength is as follows: 600 MPa; hardness (HRB) 80; the chemical components and the mass percentage are as follows: 0.04% of C, Si: 0.020%, Mn: 0.20%, P:0.020%, S: 0.015%, Als: 0.05 percent, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities.
The production method of the cold-rolled steel strip for the high-hardness hardware is characterized by comprising the following steps of: the method comprises the following production steps:
(1) producing a cold rolling raw material by hot rolling: the produced molten iron is subjected to desulfurization, converter smelting, LF furnace refining and continuous casting to form a casting blank; hot rolling by adopting a 7-frame hot continuous rolling mill, wherein the final rolling temperature is controlled as follows: 890 ℃, and the coiling temperature is controlled as follows: the temperature is 670 ℃, the process of three-high one-low is adopted for control, the yield strength of the cold rolling raw material is 310MPa, the tensile strength is 380MPa, and the elongation after fracture is more than or equal to 46 percent; no crack is generated by cold bending at 180 degrees; preparing a cold rolling raw material with the thickness of 3.25 mm;
the cold rolling raw material comprises the following chemical components in percentage by mass: 0.04% of C, Si: 0.020%, Mn: 0.20%, P:0.020%, S: 0.015%, Als: 0.05 percent, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities;
(2) and hydrochloric acid pickling: pickling the cold-rolled raw material by adopting a 1580mm shallow slot turbulent flow push-pull type hydrochloric acid pickling machine to remove iron oxide scales on the surface of the cold-rolled raw material so as to prepare a pickled steel strip;
the hydrochloric acid pickling tank of the 1580mm shallow groove turbulent flow push-pull type hydrochloric acid pickling unit comprises a 1# acid tank, a 2# acid tank, a 3# acid tank, a 4# acid tank, a 5# acid tank and a 6# acid tank, wherein the 6 acid tanks are connected in series and are independent of each other, wherein: the hydrochloric acid temperature in the No. 1 acid tank is controlled at 85 ℃, the concentration of ferrous ions in hydrochloric acid is 126g/l, and the concentration of HCl in hydrochloric acid is controlled at 140 g/l; controlling the hydrochloric acid temperature in the 2# acid tank at 85 ℃; controlling the temperature of hydrochloric acid in the 3# acid tank to be 80 ℃; controlling the hydrochloric acid temperature in the 4# acid tank at 75 ℃; controlling the hydrochloric acid temperature in the 5# acid tank at 75 ℃; controlling the hydrochloric acid temperature in the No. 6 acid tank at 80 ℃, controlling the concentration of ferrous ions in hydrochloric acid at 10g/l and controlling the concentration of HCl in hydrochloric acid at 160g/l to remove iron scales on the surface of the cold-rolled raw material; the temperature of rinsing water in the rinsing tank is controlled at 85 ℃, the conductivity of the rinsing water is controlled at 196 mu s/cm, the content of chloride ions is controlled at 64mg/l, so that residual hydrochloric acid on the surface of the plate is cleaned, and the quality of the acid-washed surface is improved;
(3) and first cold rolling: carrying out first cold rolling on the acid-washed steel strip by a 1700mm single-stand six-roller reversible cold rolling mill to roll a cold-rolled steel strip semi-finished product with the thickness of 0.99 mm; the hardness of the roll body of the roll of the 1700mm single-stand six-roll reversible cold-rolling mill is 91HSD, the concentration of the emulsion is 1.5%, and the emulsion is sprayed by using an emulsion spray beam of DN80mm and a 4903 type emulsion nozzle so as to improve the process lubrication effect; the 1700mm single-stand six-roller reversible cold rolling mill adopts Siemens S7-400PLC system and FM458 process module control technology to realize high-precision control of thickness, and thickness deviation is controlled to be-0.01 mm-0 mm;
(4) and annealing: annealing the semi-finished cold-rolled steel strip in a 100t strong convection all-hydrogen bright cover type annealing furnace to obtain an annealed product; the annealing temperature of the 100t strong convection all-hydrogen bright hood-type annealing furnace is controlled at 670 ℃, and the heat preservation time is controlled at 12 h; the 100t strong convection all-hydrogen bright hood-type annealing furnace adopts Siemens S7-300PLC automatic control technology to realize the fluctuation control of the annealing temperature within the range of 5 ℃;
when the 100t strong convection all-hydrogen bright hood-type annealing furnace is used for annealing, the heating rate is controlled at 110 ℃/h when the temperature is increased from 250 ℃ to 450 ℃, and the temperature is kept for 2h when the temperature reaches 450 ℃; heating again, controlling the heating rate at 50 ℃/h when the temperature rises from 450 ℃ to 670 ℃, and preserving the heat for 12h when the temperature reaches 670 ℃; in the temperature rising stage, the flow rate of hydrogen purging is controlled at 30 cubic meters per hour; when cooling, firstly air-cooling to 370 ℃, then cooling to 95 ℃ by spray water, and discharging;
(5) and second cold rolling: the annealed product is subjected to secondary cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill again, the thickness of the final pass is controlled to be 0.695mm, and a cold-rolled steel strip with the thickness of 0.70mm is rolled; the roller body hardness of the roller of the 1700mm single-stand six-roller reversible cold rolling mill is 94HSD, and the concentration of the emulsion is 2.0%;
(6) straightening the plate shape and oiling: uncoiling and coiling the cold-rolled steel strip on a 1580mm stretch bending straightener until the unevenness is less than or equal to 1 mm; and in the uncoiling and coiling processes, coating antirust oil on the upper surface and the lower surface of the cold-rolled steel strip by using an electrostatic oiling machine to prepare the cold-rolled steel strip for the high-hardness hardware.
Through detection, the main technical indexes are as follows: the thickness is 0.70 mm; thickness deviation: -0.01 mm-0 mm; the tensile strength is 600 MPa; hardness (HRB) 80; the shape of the plate is flat and straight, and the unevenness is less than or equal to 1 mm; the surface is uniform and consistent, and has no defects of bubbles, oil stains, impurities, stripes, chromatic aberration and the like; the product is qualified.
Claims (4)
1. The utility model provides a high rigidity is cold rolled steel strip for hardware which characterized in that: the thickness of the cold-rolled steel strip for the high-hardness hardware is 0.50-0.70 mm, and the tensile strength is as follows: 550MPa to 600 MPa; the hardness is 65-80; the chemical components and the mass percentage are as follows: 0.03-0.04% of C, Si: 0.010-0.020%, Mn: 0.15% -0.20%, P is 0.005% -0.020%, S: 0.005% -0.015%, Als: 0.02-0.05%, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities.
2. The method for producing a cold-rolled steel strip for high-hardness hardware according to claim 1, characterized in that: the method comprises the following production steps:
(1) producing a cold rolling raw material by hot rolling: the produced molten iron is subjected to desulfurization, converter smelting, LF furnace refining and continuous casting to form a casting blank; hot rolling by adopting a 7-frame hot continuous rolling mill, wherein the final rolling temperature is controlled as follows: 850-890 ℃, and the coiling temperature is controlled as follows: controlling the temperature of 630-670 ℃ by adopting a 'three-high one-low' process, so that the yield strength of the cold-rolled raw material is 260-310 MPa, the tensile strength is 340-380 MPa, and the elongation after fracture is more than or equal to 44%; no crack is generated by cold bending at 180 degrees; preparing a cold rolling raw material with the thickness of 3.00 mm-3.25 mm;
the cold rolling raw material comprises the following chemical components in percentage by mass: 0.03-0.04% of C, Si: 0.010-0.020%, Mn: 0.15% -0.20%, P is 0.005% -0.020%, S: 0.005% -0.015%, Als: 0.02-0.05%, less than or equal to 30ppm of oxygen, less than or equal to 50ppm of nitrogen, less than or equal to 50ppm of other trace elements, and the balance of Fe and inevitable impurities;
(2) and hydrochloric acid pickling: pickling the cold-rolled raw material by adopting a 1580mm shallow slot turbulent flow push-pull type hydrochloric acid pickling machine to remove iron oxide scales on the surface of the cold-rolled raw material so as to prepare a pickled steel strip;
(3) and first cold rolling: carrying out first cold rolling on the acid-washed steel strip by a 1700mm single-stand six-roller reversible cold rolling mill to roll a cold-rolled steel strip semi-finished product with the thickness of 0.77 mm-0.99 mm; the hardness of a roll body of a roll of the 1700mm single-rack six-roll reversible cold rolling mill is 91 HSD-93 HSD, the concentration of emulsion is 1.5% -2.0%, and emulsion is sprayed by an emulsion spray beam of DN80mm and an 4903 type emulsion nozzle so as to improve the process lubrication effect; the 1700mm single-stand six-roller reversible cold rolling mill adopts Siemens S7-400PLC system and FM458 process module control technology to realize high-precision control of thickness, and thickness deviation is controlled to be-0.01 mm-0 mm;
(4) and annealing: annealing the semi-finished cold-rolled steel strip in a 100t strong convection all-hydrogen bright cover type annealing furnace to obtain an annealed product; the annealing temperature of the 100t strong convection total hydrogen bright hood type annealing furnace is controlled between 650 ℃ and 670 ℃, and the heat preservation time is controlled between 12h and 14 h; the 100t strong convection all-hydrogen bright hood-type annealing furnace adopts Siemens S7-300PLC automatic control technology to realize the fluctuation control of the annealing temperature within the range of 5 ℃;
(5) and second cold rolling: the annealed product is subjected to secondary cold rolling by a 1700mm single-stand six-roller reversible cold rolling mill, the last pass thickness is controlled to be 0.495 mm-0.695 mm, and a cold-rolled steel strip with the thickness of 0.50 mm-0.70 mm is rolled; the hardness of a roll body of a roll of the 1700mm single-stand six-roll reversible cold rolling mill is 94 HSD-96 HSD, and the concentration of emulsion is 2.0% -3.0%;
(6) straightening the plate shape and oiling: uncoiling and coiling the cold-rolled steel strip on a 1580mm stretch bending straightener until the unevenness is less than or equal to 1 mm; and in the uncoiling and coiling processes, coating antirust oil on the upper surface and the lower surface of the cold-rolled steel strip by using an electrostatic oiling machine to prepare the cold-rolled steel strip for the high-hardness hardware.
3. The method for producing the cold-rolled steel strip for high-hardness hardware according to claim 2, characterized in that: in the step (2), the hydrochloric acid washing tank of the 1580mm shallow-groove turbulent flow push-pull type hydrochloric acid washing unit comprises a 1# acid tank, a 2# acid tank, a 3# acid tank, a 4# acid tank, a 5# acid tank and a 6# acid tank, wherein the 6 acid tanks are connected in series and are independent from each other, wherein: the hydrochloric acid temperature in the No. 1 acid tank is controlled to be 75-85 ℃, the concentration of ferrous ions in hydrochloric acid is less than 130g/l, and the concentration of HCl in hydrochloric acid is controlled to be 60-140 g/l; controlling the hydrochloric acid temperature in the 2# acid tank to be between 70 and 85 ℃; controlling the hydrochloric acid temperature in the 3# acid tank to be 70-80 ℃; controlling the hydrochloric acid temperature in the 4# acid tank at 65-75 ℃; controlling the temperature of hydrochloric acid in the No. 5 acid tank to be 60-75 ℃; controlling the hydrochloric acid temperature in the No. 6 acid tank to be 60-80 ℃, controlling the concentration of ferrous ions in hydrochloric acid to be 10-60 g/l, and controlling the concentration of HCl in hydrochloric acid to be 160-240 g/l so as to remove iron oxide scales on the surface of the cold rolling raw material; the temperature of rinsing water in the rinsing tank is controlled to be 75-85 ℃, the conductivity of the rinsing water is controlled to be less than or equal to 200 mu s/cm, and the content of chloride ions is controlled to be less than or equal to 100mg/l, so that residual hydrochloric acid on the plate surface is cleaned, and the surface quality of acid washing is improved.
4. The method for producing the cold-rolled steel strip for high-hardness hardware according to claim 2, characterized in that: in the step (4), when the 100t strong convection all-hydrogen bright hood-type annealing furnace is used for annealing, the temperature rising rate is controlled to be 110 ℃/h when the temperature rises from 250 ℃ to 450 ℃ to 470 ℃, and the temperature is kept for 2h to 4h when the temperature reaches 450 ℃ to 470 ℃; heating again, wherein the heating rate is controlled to be 35-50 ℃/h when the temperature is increased from 450-470 ℃ to 650-670 ℃, and the temperature is kept for 12-14 h when the temperature reaches 650-670 ℃; in the temperature rising stage, the flow rate of hydrogen purging is controlled to be 30-40 cubic meters per hour; when cooling, firstly air-cooling to 350-370 ℃, then cooling to 85-95 ℃ by spray water, and discharging.
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