CN1058529C - Method for heating cold steel ingot with gland - Google Patents
Method for heating cold steel ingot with gland Download PDFInfo
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- CN1058529C CN1058529C CN97104172A CN97104172A CN1058529C CN 1058529 C CN1058529 C CN 1058529C CN 97104172 A CN97104172 A CN 97104172A CN 97104172 A CN97104172 A CN 97104172A CN 1058529 C CN1058529 C CN 1058529C
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- steel ingots
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The present invention relates to a method for heating a cold steel ingot with a gland, which belongs to the field of controlling the heating process of cogged steel ingots. After the steel ingots are loaded into a soaking furnace, fuel is stopped supplying for the furnace; the steel ingots are preheated for 10 to 30 minutes. Then, the furnace temperature is raised to 950 to 1050 DEG C at the speed of 100 to 140 DEG C per hour; after the temperature is kept for 20 to 40 minutes; and the furnace temperature is rapidly raised to a specified soaking temperature and is kept until the steel ingots are burnt well and are discharged. The heating method decreases temperature difference inside and outside the steel ingots in the early heating stage, and therefore, temperature stress generated in the steel ingots is also small. The method decreases the cogged crack defect, and enhances the cogged yield of the cold steel ingots with a gland. The method also has the function for reducing energy consumption and the oxidation burning loss of the steel ingots.
Description
The present invention relates to a kind of method for heating cold steel ingot with gland, specifically a kind of technology with soaking pit heating capped steel steel ingot belongs to the control of cogged ingot heat-processed.
In the prior art, the general technology process of cold steel ingot with gland heating is: promptly supply with the burning maximum fuel after the steel ingot shove charge, furnace temperature is risen rapidly, reach predetermined tapping furnace temperature.Then, reduce fuel feed gradually, keep furnace temperature constant, come out of the stove up to steel ingot is burned, the heating control process is simple, sees Fig. 1.Existing problem is: this heating means are very big at heating initial stage steel ingot inside and outside temperature difference, make it produce bigger thermal stress, and the unrelieved stress direction that produces in this thermal stress and the steel ingot casting process of cooling is just identical, the stack of formation stress, increase the appearance of drawing crack when rolling, caused the breaking down recovery rate of cold steel ingot with gland low.And steel ingot is big more, and unrelieved stress is big more, the big ingot shape steel ingot of producing for the top-pour method especially, and itself hard shell band is thin, and unrelieved stress is big, the influence of the thermal stress that is subjected to when adding heating superposeing, just easier the generation at weakness destroyed when rolling.
The method for heating cold steel ingot with gland that the purpose of this invention is to provide a kind of thermal stress that can reduce in the heat-processed to be produced to reduce the crack defect that is produced after the cold steel ingot with gland breaking down, improves recovery rate.
The objective of the invention is to realize by following measure:
A kind of method for heating cold steel ingot with gland, its technological process is as follows:
When 1, furnace temperature is 750-850 ℃, with the steel ingot soaking pit of packing into;
2, after steel ingot is packed soaking pit into, stop supply of fuel in the stove, preheating 10-30 minute;
3, with 100-140 ℃ speed per hour furnace temperature is risen to 950-1050 ℃, be incubated 20-40 minute;
4, supply with the burning maximum fuel, fast furnace temperature is risen to the final soaking temperature of regulation, reduce fuel feed gradually, be incubated to the burned tapping of steel ingot.
The final soaking temperature of regulation is 1300-1340 ℃, is incubated tapping in 480-550 minute.
Description of drawings:
Fig. 1 is a cold steel ingot with gland heating process process synoptic diagram in the prior art.
Fig. 2 is the inventive method cold steel ingot with gland heating process process synoptic diagram.
Among the figure: abscissa t is the time, and unit is minute;
Ordinate T is a temperature, and unit is ℃.
As shown in Figure 2, after the cold steel ingot with gland shove charge, the preheated one-section time in stove, then heat up with slower speed, and be incubated in uniform temperature. This heating means in the heating initial stage, the steel ingot internal-external temperature difference is reduced, thereby the temperature stress that produces in steel ingot are also little. Simultaneously, low because of furnace temperature at this one-phase, corresponding EGT is also low, and the heat loss of taking away is few, and the fuel consumption of stove is reduced. The whole heating process that adopts this method to finish the cold steel of capped steel approximately needs 12-15 hour, prolonged 30-50 minute than prior art, however, because steel in heating process oxidization burning loss and heat time heating time relation in direct ratio, become the cube exponential relationship with heating-up temperature, because the inventive method is low in Heating Steel Ingots initial stage furnace temperature, thereby has the effect of obvious minimizing scaling loss.
Compared with prior art the advantage that has of the present invention is: the temperature stress that heating process produces is little, reduced the breaking down crack defect, improve the breaking down recovery rate of cold steel ingot with gland, reduced simultaneously energy consumption and the oxidization burning loss of steel ingot in heating process of stove.
Introduce 2 embodiment of the present invention below.
Embodiment sees attached list.
Adopt the inventive method in soaking pit, to heat 410,000 tons of cold steel ingot with gland, after the breaking down, compare recovery rate with the breaking down product of prior art heating process and improved 1.24%.
Subordinate list
| Steel ingot cross-sectional dimension (ingot shape) mm * mm | Shove charge furnace temperature ℃ | Soaking time minute | Heat up at a slow speed | Soaking time minute | Be rapidly heated to final soaking temperature ℃ | In final soaking temperature soaking time minute | ||
| Speed ℃/hour | Rise to temperature ℃ | |||||||
| Embodiment 1 | 788×1013 | 772 | 15 | 100 | 1050 | 20 | 1310 | 500 |
| Embodiment 2 | 854×1057 | 825 | 30 | 140 | 1000 | 30 | 1320 | 530 |
Claims (2)
1. method for heating cold steel ingot with gland, the technological process that it is characterized in that it is such:
When 1) furnace temperature is 750-850 ℃, with the steel ingot soaking pit of packing into;
2) after steel ingot is packed soaking pit into, stop supply of fuel in the stove, preheating 10-30 minute;
3) with 100-140 ℃ speed per hour furnace temperature is risen to 950-1050 ℃, be incubated 20-40 minute;
4) supply with the final soaking temperature that the burning maximum fuel rises to furnace temperature regulation fast, reduce fuel feed gradually, be incubated to the burned tapping of steel ingot.
2. method according to claim 1 is characterized in that: the final soaking temperature of described regulation is 1300-1340 ℃, is incubated tapping in 480-550 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97104172A CN1058529C (en) | 1997-04-29 | 1997-04-29 | Method for heating cold steel ingot with gland |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97104172A CN1058529C (en) | 1997-04-29 | 1997-04-29 | Method for heating cold steel ingot with gland |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1171447A CN1171447A (en) | 1998-01-28 |
| CN1058529C true CN1058529C (en) | 2000-11-15 |
Family
ID=5167198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97104172A Expired - Fee Related CN1058529C (en) | 1997-04-29 | 1997-04-29 | Method for heating cold steel ingot with gland |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058529C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352953C (en) * | 2005-02-28 | 2007-12-05 | 宝山钢铁股份有限公司 | Soaking method for low-carbon high-chromium alloy steel ingot |
| CN101914671B (en) * | 2010-08-11 | 2012-07-25 | 内蒙古北方重工业集团有限公司 | Steel ingot heating energy-saving method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238322A (en) * | 1994-02-28 | 1995-09-12 | Nippon Steel Corp | Method for preventing surface cracking in steel slab |
-
1997
- 1997-04-29 CN CN97104172A patent/CN1058529C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238322A (en) * | 1994-02-28 | 1995-09-12 | Nippon Steel Corp | Method for preventing surface cracking in steel slab |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1171447A (en) | 1998-01-28 |
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| C10 | Entry into substantive examination | ||
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| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
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| CP03 | Change of name, title or address |
Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee after: BAOSHAN IRON & STEEL CO.,LTD. Address before: 201900 No. 1, Middle Road, Baoshan District, Shanghai Patentee before: Baosteel Group Corporation |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20001115 Termination date: 20130429 |