CN112246877A - Production method for heating thin-specification blank by using trolley type heating furnace - Google Patents
Production method for heating thin-specification blank by using trolley type heating furnace Download PDFInfo
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- CN112246877A CN112246877A CN202011022540.1A CN202011022540A CN112246877A CN 112246877 A CN112246877 A CN 112246877A CN 202011022540 A CN202011022540 A CN 202011022540A CN 112246877 A CN112246877 A CN 112246877A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 229910000746 Structural steel Inorganic materials 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 239000002436 steel type Substances 0.000 claims description 2
- 230000007812 deficiency Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production method for heating thin-specification blanks by using a trolley type heating furnace, which relates to the technical field of steel production, wherein the raising of a steel plate is controlled, the temperature of the upper surface of a plate blank is required to be increased in the heating aspect, the temperature difference between the upper surface and the lower surface is realized by 20-50 ℃, and the temperature difference between the upper surface and the lower surface can be improved in the aspects of increasing the height of a heating cushion block, reducing the power of a lower burner and the like. Breaks through the production limitation of the trolley type heating furnace, realizes mass production, makes up the deficiency of the production capacity of the continuous furnace, and has great value-added benefit.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a production method for heating thin-specification blanks by using a trolley type heating furnace.
Background
The existing trolley type heating furnace of a wide and thick plate factory is used for heating super-thick blanks, and the thickness of the heating blanks is designed to be 400-650 mm. The blank is mainly rolled into super-thick steel with the thickness of more than 200mm, the order is extremely few after the order structure is adjusted, and the blank is in an idle state most of the time. With the continuous improvement of the rhythm of the wide and thick plate rolling mill, a trolley type heating furnace is needed to heat the 220-plus-320 mm section thin blank in the production process, so that the capacity deficiency of the stepping type heating furnace is made up. Because the design of the trolley type heating furnace does not consider heating thin blanks at the beginning, thin specifications cannot be produced, the waste is generated by warping and rolling, the more thin the blank is, the more serious the warping and rolling is, the incidence rate of the waste generated by warping and rolling of the thin blank of the trolley type heating furnace is up to 18 percent, and the yield of the wide plate are seriously influenced.
At present, high-temperature trolley type heating furnaces at home and abroad are mainly used for heating extra-thick plates such as die casting blanks, welding blanks and the like, and the thickness of the blanks is more than 500 mm. The technology for heating 220mm (less than 45% of lower limit) thin blanks by a thick blank trolley type heating furnace is not available at home and abroad due to the design limitation of the trolley type heating furnace.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a production method for heating a thin specification slab using a car-type heating furnace, comprising
Transformation of trolley type heating furnace
The original refractory brick building pier and iron pad structure is transformed into a precast block and iron pad structure;
the power of the lower burner is reduced, the opening of a gas hand valve of the lower burner is adjusted to 85 percent of the original opening, and the heat supply capacity of the lower burner is reduced;
changing a pulse burner control mode, realizing the function of singly opening an upper burner under an automatic temperature control state, closing a lower burner 30 minutes before tapping, setting the furnace temperature to be increased by 20 ℃, and increasing the upper surface temperature;
(II) selection of material type
Selecting blanks according to the requirements of steel types, blank sizes and rolling specifications;
(III) heating technology
Tapping temperature is 1220 +/-20 ℃, heating is carried out for 5 hours, heat preservation is carried out for 1 hour, steel is taken out and rolled within 2 hours after the temperature is raised to 1220 ℃ according to the gap of waiting for temperature, and the time of the steel in the furnace is ensured to be within 9 hours; in order to ensure the temperature difference between the upper surface and the lower surface, the lower burner is closed after the temperature is kept for 30 minutes, the temperature is increased by 20-50 ℃ according to the head warping condition, and the temperature of the upper burner is kept for 30-40 minutes by opening the upper burner;
when the heating furnace needs to be discharged from the trolley furnace after the temperature is required, discharging trolley furnace blanks when the heating furnace needs to be discharged from the trolley furnace before 8 steel blocks are started, wherein the trolley furnace and the heating furnace need to alternately discharge steel, namely 2 heating furnaces discharged from the trolley furnace are discharged from 2 heating furnaces, the trolley furnace is immediately returned after the steel discharge is finished, and the upper burner is manually opened to rapidly increase the furnace temperature to 1240 ℃;
(IV) Rolling Process
Descaling: if the descaling of the descaling box is not clean or the rolling temperature measured by a high-temperature meter in front of the descaling box is lower than 950 ℃, rolling is prohibited and the steel is returned;
the reduction amount: widening and rolling, wherein the pass reduction is less than or equal to 20 mm; full longitudinal rolling with the blank length being more than or equal to 4500mm, and pass reduction being less than or equal to 30 mm;
buckling heads: the rolling line is set to 810, the warping buttonhead factor is preset to 110 in each pass, and the warping buttonhead is adjusted in time according to the situation of warping buttonhead.
The technical scheme of the invention is further defined as follows:
the production method for heating the thin-specification blank by using the trolley type heating furnace is characterized in that the prefabricated block is provided with the sizing block structure, and the height of the upper end face of the sizing block from the trolley surface is increased from 640mm to 820 mm.
The production method for heating the thin-specification blank by using the trolley type heating furnace comprises the material type selection step according to the following standards:
steel grade: structural steel below grade E, common container, wear resistant, Longying, No. 45 steel;
blank size: blank thickness: the thickness of the continuous casting billet is 260-320 mm; width of the blank: 1800-2800 mm; blank length: stretching and rolling for 2800-4500 mm, and full longitudinal rolling for 2800-7500 mm;
rolling specification: the thickness of the finished product is more than or equal to 20mm, the width is less than or equal to 3500mm, and the broadening ratio is less than 1.4.
In the production method for heating the thin-gauge blank by using the trolley type heating furnace, the design of high-gauge varieties and ship boards is forbidden, wherein the high-gauge varieties comprise special steel, creep excavation, temporary work, G1 or G2 steel for engineering machinery.
The production method for heating the thin-specification blank by using the trolley type heating furnace comprises the heating process steps that as the trolley furnace is heightened by the sizing iron, the time for opening the upper burner singly is adjusted according to the temperature difference between the upper surface and the lower surface of the blank after the scale removal.
The production method for heating the thin-specification blank by using the trolley type heating furnace comprises the rolling process steps of reducing the reduction and increasing the rolling pass if the warping is not controlled.
The invention has the beneficial effects that: according to the invention, the warping of the steel plate is controlled, the temperature on the upper surface of the plate blank needs to be increased in the heating aspect, the temperature difference between the upper surface and the lower surface of the plate blank is realized, and the temperature difference between the upper surface and the lower surface of the plate blank can be improved in the aspects of increasing the height of the heating cushion block, reducing the power of the lower burner and the like. Breaks through the production limitation of the trolley type heating furnace, realizes mass production, makes up the deficiency of the production capacity of the continuous furnace, and has great value-added benefit.
Detailed Description
The production method for heating thin-specification blanks by using the trolley type heating furnace provided by the embodiment comprises the following steps:
s1, transforming the original refractory brick building pier and iron padding structure into a precast block and iron padding structure, wherein the height of the upper end face of the iron padding from the surface of the trolley is increased from 640mm to 820 mm;
s2, adjusting the power of the lower burner downward, adjusting the opening of a gas hand valve of the lower burner to 85% of the original opening, and reducing the heat supply capacity of the lower burner;
s3, utilizing the function of singly opening the upper burner under the automatic temperature control state, closing the lower burner 30 minutes before tapping, setting the furnace temperature to be increased by 20 ℃, and increasing the upper surface temperature;
s4, selecting steel grades below grade E and Q345B;
s5, selecting the blank size to be 260mm in thickness, 2600mm in width and 3200mm in length;
s6, selecting the rolling specification to obtain a finished product with the thickness of 28mm, the width of 3120mm and the widening ratio of 1.2;
s7, tapping temperature is 1240 ℃, temperature is raised for 5 hours, heat preservation is carried out for 1 hour, and steel is discharged and rolled within 2 hours after temperature is raised to 1220 ℃ according to the gap of waiting for temperature (the time in the furnace is ensured to be within 9 hours); in order to ensure the temperature difference between the upper surface and the lower surface, the lower burner is closed after the temperature is kept for 30 minutes, the temperature is increased by 20 ℃, and the temperature is kept for 30 minutes by opening the upper burner only;
s8, when the heating furnace is 8 steel blocks before the temperature is reached, discharging trolley furnace blanks, and alternately discharging steel from the trolley furnace and the heating furnace, namely discharging 2 heating furnaces (1 steel for each furnace) from the trolley furnace, returning the trolley furnace immediately after the trolley furnace discharges the steel, and manually opening an upper burner to quickly raise the furnace temperature to 1240 ℃;
s9, descaling is good, the temperature is 975 ℃ measured by a high-temperature meter before the rolling mill, and rolling is started normally;
s10, widening and rolling, wherein the pass reduction is controlled to be 20 mm;
and S11, setting the rolling line to be 810, presetting the warping and heading factor to be 110 in each pass, rolling the third pass to start heading, and adjusting the warping and heading factor of the subsequent pass to be 106.
Before the implementation, the waste rate of the head raising of the rolling of the thin blank of the trolley furnace is 18.06 percent. After the implementation, the incidence rate of waste warping in 1 month in 2020 is 3.14%, the incidence rate of waste warping in 2 months is 1.28%, 6000 tons of thin slabs are heated by a trolley furnace in 3 months in 2020, and no waste of rolling warping exists. The continuous production of the trolley furnace is realized, the yield is increased by 3.6 ten thousand tons in the expected year, and the yield and the efficiency are increased by 648 ten thousand yuan.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A production method for heating thin-specification blanks by using a trolley type heating furnace is characterized by comprising the following steps of: comprises that
Transformation of trolley type heating furnace
The original refractory brick building pier and iron pad structure is transformed into a precast block and iron pad structure;
the power of the lower burner is reduced, the opening of a gas hand valve of the lower burner is adjusted to 85 percent of the original opening, and the heat supply capacity of the lower burner is reduced;
changing a pulse burner control mode, realizing the function of singly opening an upper burner under an automatic temperature control state, closing a lower burner 30 minutes before tapping, setting the furnace temperature to be increased by 20 ℃, and increasing the upper surface temperature;
(II) selection of material type
Selecting blanks according to the requirements of steel types, blank sizes and rolling specifications;
(III) heating technology
Tapping temperature is 1220 +/-20 ℃, heating is carried out for 5 hours, heat preservation is carried out for 1 hour, steel is taken out and rolled within 2 hours after the temperature is raised to 1220 ℃ according to the gap of waiting for temperature, and the time of the steel in the furnace is ensured to be within 9 hours; in order to ensure the temperature difference between the upper surface and the lower surface, the lower burner is closed after the temperature is kept for 30 minutes, the temperature is increased by 20-50 ℃ according to the head warping condition, and the temperature of the upper burner is kept for 30-40 minutes by opening the upper burner;
when the heating furnace needs to be discharged from the trolley furnace after the temperature is required, discharging trolley furnace blanks when the heating furnace needs to be discharged from the trolley furnace before 8 steel blocks are started, wherein the trolley furnace and the heating furnace need to alternately discharge steel, namely 2 heating furnaces discharged from the trolley furnace are discharged from 2 heating furnaces, the trolley furnace is immediately returned after the steel discharge is finished, and the upper burner is manually opened to rapidly increase the furnace temperature to 1240 ℃;
(IV) Rolling Process
Descaling: if the descaling of the descaling box is not clean or the rolling temperature measured by a high-temperature meter in front of the descaling box is lower than 950 ℃, rolling is prohibited and the steel is returned;
the reduction amount: widening and rolling, wherein the pass reduction is less than or equal to 20 mm; full longitudinal rolling with the blank length being more than or equal to 4500mm, and pass reduction being less than or equal to 30 mm;
buckling heads: the rolling line is set to 810, the warping buttonhead factor is preset to 110 in each pass, and the warping buttonhead is adjusted in time according to the situation of warping buttonhead.
2. The production method of heating a thin specification slab using a cart-type heating furnace according to claim 1, characterized in that: according to the precast block and pad iron structure, the height of the upper end face of the pad iron from the trolley surface is increased to 820mm from 640 mm.
3. The production method of heating a thin specification slab using a cart-type heating furnace according to claim 1, characterized in that: the material type selection step is carried out according to the following standards:
steel grade: structural steel below grade E, common container, wear resistant, Longying, No. 45 steel;
blank size: blank thickness: the thickness of the continuous casting billet is 260-320 mm; width of the blank: 1800-2800 mm; blank length: stretching and rolling for 2800-4500 mm, and full longitudinal rolling for 2800-7500 mm;
rolling specification: the thickness of the finished product is more than or equal to 20mm, the width is less than or equal to 3500mm, and the broadening ratio is less than 1.4.
4. The production method of heating a thin specification slab using a cart-type heating furnace according to claim 3, characterized in that: the high-surface variety and the ship plate are forbidden to be designed, and the high-surface variety comprises Kate steel, Xudao, temporary working steel, G1 or G2 steel for engineering machinery.
5. The production method of heating a thin specification slab using a cart-type heating furnace according to claim 1, characterized in that: in the heating process step, as the sizing block is heightened by the trolley furnace, the time for opening the upper burner singly is adjusted according to the temperature difference between the upper surface and the lower surface after the scale removal of the blank.
6. The production method of heating a thin specification slab using a cart-type heating furnace according to claim 1, characterized in that: and the rolling process step reduces the reduction and increases the rolling pass if the warping is not controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022540.1A CN112246877A (en) | 2020-09-25 | 2020-09-25 | Production method for heating thin-specification blank by using trolley type heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022540.1A CN112246877A (en) | 2020-09-25 | 2020-09-25 | Production method for heating thin-specification blank by using trolley type heating furnace |
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| CN112246877A true CN112246877A (en) | 2021-01-22 |
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| CN202011022540.1A Pending CN112246877A (en) | 2020-09-25 | 2020-09-25 | Production method for heating thin-specification blank by using trolley type heating furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042752A (en) * | 2021-11-10 | 2022-02-15 | 山东钢铁集团日照有限公司 | Treatment process of large-thickness small-size blank and application thereof |
| CN115125380A (en) * | 2022-06-24 | 2022-09-30 | 舞阳钢铁有限责任公司 | Method for efficiently heating and rolling alloy steel by matching trolley furnace and continuous furnace |
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| CN110763011A (en) * | 2019-11-05 | 2020-02-07 | 中钢集团鞍山热能研究院有限公司 | Double-flame heating and smoke exhaust adjustable trolley type heating furnace and heating temperature control method |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114042752A (en) * | 2021-11-10 | 2022-02-15 | 山东钢铁集团日照有限公司 | Treatment process of large-thickness small-size blank and application thereof |
| CN115125380A (en) * | 2022-06-24 | 2022-09-30 | 舞阳钢铁有限责任公司 | Method for efficiently heating and rolling alloy steel by matching trolley furnace and continuous furnace |
| CN115125380B (en) * | 2022-06-24 | 2023-08-22 | 舞阳钢铁有限责任公司 | Method for efficiently heating and rolling alloy steel by matching trolley furnace with continuous furnace |
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