CN203846060U - Long-range roller hearth type solid solution annealing furnace - Google Patents
Long-range roller hearth type solid solution annealing furnace Download PDFInfo
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- CN203846060U CN203846060U CN201420227329.7U CN201420227329U CN203846060U CN 203846060 U CN203846060 U CN 203846060U CN 201420227329 U CN201420227329 U CN 201420227329U CN 203846060 U CN203846060 U CN 203846060U
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Abstract
The utility model relates to an annealing furnace, particularly to a long-range roller hearth type solid solution annealing furnace suitable for preparing high-silicon austenitic stainless steel. The annealing furnace comprises a feeding area, a first heating area, a heat preservation area, a second heating area, an isothermal area, a buffering area and a discharging area, wherein furnace rollers are arranged on the bottoms of all areas; the running speeds of the furnace rollers of all areas are independently adjusted; a protection gas channel is arranged above the furnace roller placed in the first heating area; a gas orifice is formed in the protection gas channel; a furnace bottom heating wire is arranged under the furnace roller; the feeding area comprises a feeding table and a support frame; a sliding way is arranged at the front end of the feeding table; a striker plate is fixedly arranged at the front part of the feeding table; an impelling cylinder for pushing materials into the heating area is further fixedly arranged on the support frame; baffles are arranged on the two sides of the feeding table. According to the long-range roller hearth type solid solution annealing furnace, heat permeation can be effectively enhanced, so that the steel tube is adequately subjected to solid solution and superheat degree can be reduced; the long-range roller hearth type solid solution annealing furnace is especially suitable for preparing strong corrosion resistant high-silicon austenitic stainless steel seamless tubes for nitric acid industry.
Description
Technical field
The utility model relates to a kind of annealing furnace, particularly a kind of roller-hearth solution annealing furnace that is applicable to preparing high-silicon austenite stainless steel.
Background technology
Nitric acid is a kind of Oxidant.Austenitic stainless steel very easily forms Cr203 purification membrane in nitric acid medium, brings into play its good corrosion resisting property.The destruction of austenitic stainless steel in nitric acid medium is mainly uniform corrosion that speed is very low and dangerous two kinds of forms of intergranular corrosion.
In rare nitric acid (concentration is lower than 68%), in the austenitic stainless steel of complete solution heat-treated condition, solidity to corrosion is fair, once in sensitization state (steel after solution heat treatment suffer the heat affecting of 650 DEG C of left and right temperature), very easily the intergranular corrosion of causing danger property destroys.Generally acknowledged stainless steel intercrystalline corrosion classical theory thinks, when sensitization state, intercrystalline has been separated out the carbide of rich chromium, crystal boundary proximity formed and be reduced to Pin Ge district under solidity to corrosion boundary because of chromium content.
Adding of Si element, can effectively increase the passivation ability of austenitic stainless steel in acid with strong oxidizing property on the one hand, and further carrying out of slowing down corrosion, especially, in the time that the Si content in austenitic stainless steel exceedes 4%, can also eliminate Intergranular corrosion completely; But then, due to adding in a large number of Si element, inevitably can reduce the solid solubility of C in austenite lattice, cause Carbide Precipitation, also can generate in addition a large amount of silicides, delta ferrite and equate, these harmful fragility are increasing the hot and cold processing characteristics that also can affect material in selective corrosion is inclined to.Especially hot-work characteristic, as: hot piercing link, once improper process control can cause a large amount of crackles and affect quality and lumber recovery.As can be seen here, too high Si content, has seriously reduced the processing characteristics of high-silicon austenite stainless steel, makes the controlled machined parameters scope of material become extremely narrow, and therefore, it is extremely important that research effectively solves the hot and cold Problems in forming of high-silicon austenite stainless steel material.
Contriver finds, the form material impact of the structure of annealing furnace to high-silicon austenite stainless steel in technological forming.CN203346443 (2013-12-18) discloses a kind of for duplex stainless steel continuous heat treatment realization cooling device fast, but this device is unsuitable for preparing high-silicon austenite stainless steel, can not meets and strengthen diathermanous, to make the abundant solid solution of steel pipe requirement.
Utility model content
The purpose of this utility model be to provide a kind of can effectively strengthen diathermanous, make the abundant solid solution of steel pipe and can reduce the long-range roller-hearth solution annealing furnace of superheating temperature.
Above-mentioned technical purpose of the present utility model is achieved by the following technical programs:
A kind of long-range roller-hearth solution annealing furnace, adopts roller bottom type structure, and described in it, annealing furnace comprises the feeding area, the first heating zone, heat preservation zone, the second heating zone, isothermal region, buffer zone and the discharge zone that communicate successively;
The bottom of described feeding area, heating zone, heat preservation zone, lifting district, isothermal region, buffer zone and discharge zone is provided with furnace roller, and the furnace roller travelling speed in described each district all independently regulates;
The top of described furnace roller is provided with shielding gas passage, on described shielding gas passage, is provided with gas orifice; The below of described furnace roller is provided with furnace bottom heater strip;
Described feeding area comprise feeding table with for fixing feeding table and the bracing frame vertical with described feeding table, described feeding table front end is provided with the slideway perpendicular with described feeding table, the front portion of described feeding table is fixed with blocking material plate, on support frame as described above, be also fixed with for material being pushed to the propulsion cylinder in described heating zone, the both sides of described feeding table are provided with baffle plate.
Adopt long-range roller-hearth solution annealing furnace, can control temperature control and the furnace roller operation in each district, the especially shielding gas passage of the furnace roller of the first heating zone and the setting of gas orifice, can effectively strengthen diathermanous, make the abundant solid solution of steel pipe and can reduce the superheating temperature of steel pipe.Use high pressure water raising cooling performance, force steel pipe cooling within the extremely short time, reduce high-temperature residence time, to reduce particularly separating out of silicide of harmful phase as far as possible.
As preferably, between described the first heating zone and heat preservation zone, be provided with the first gas isolating district; Between described the second heating zone and isothermal region, be provided with the second gas isolating district; In described the first gas isolating district and the second gas isolating district, be provided with shielding gas refrigerating unit.
Adopt this scheme can effectively reduce the temperature gradient of stove entirety, reduce superheating temperature, stress is fully discharged.All very important of the heat treatment process of intermediate heat treatment process and production tube, the thermal treatment of intermediate heat treatment process and production tube all will avoid occurring that local temperature is too high or too low, in intermediate heat treatment process, suitable solid solubility temperature and soaking time are conducive to reduce stress level, reduce the generation of cold shaping process Central Asia defect, the heat treatment process of product pipe is more crucial, should ensure to have eliminated the unrelieved stress of material internal, also will ensure the surface quality of suitable two-phase proportion and pipe.
As preferably, between described buffer zone and discharge zone, be provided with protective atmosphere cooling zone.
Adopt this scheme can further effectively reduce the temperature gradient of stove entirety, reduce superheating temperature, stress is fully discharged.
As preferably, in described heating zone, be provided with temperature control unit, described temperature control unit comprises thermocouple wire, compensating lead wire, PLC control panel and temperature measurement node.
Can control more accurately the temperature control of heating zone.
As preferably, between described feeding area and the first heating zone, be provided with the blower fan of residual heat exchanging chamber and residual heat exchanging chamber over top.
Can further reduce the temperature gradient of stove entirety, reduce superheating temperature, stress is fully discharged.
As preferably, described feeding table is ladder-shaped.
Adopt hanging type solid solution, steel pipe is statically placed on bin, is relatively still in thermal treatment temp field, reduce steel pipe at high temperature with the friction of furnace roller, improve the surface quality of steel pipe.
In sum, the utlity model has following beneficial effect: the employing of long-range roller bottom type annealing furnace, on the one hand, can effectively reduce the temperature gradient of stove entirety, reduce superheating temperature, stress is fully discharged, in addition on the one hand, can effectively strengthen diathermanously, make the abundant solid solution of steel pipe, be particularly suitable for preparing strong anti-corrosion high-silicon austenite stainless steel seamless tube for nitric acid industry.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model long-range roller-hearth solution annealing furnace;
Fig. 2 is the schematic diagram of the utility model long-range roller-hearth solution annealing furnace feeding area;
Fig. 3 is the utility model heating zone schematic diagram;
Fig. 4 is grain fineness number and tissue topography's image of the high-silicon austenite stainless steel prepared by the utility model long-range roller-hearth solution annealing furnace.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, Figure 2 and Figure 3, long-range roller-hearth solution annealing furnace adopts roller bottom type structure, and annealing furnace comprises the feeding area 1, the first heating zone 2, heat preservation zone 3, the second heating zone 4, isothermal region 5, buffer zone 6 and the discharge zone 7 that communicate successively; The bottom of feeding area 1, heating zone 2, heat preservation zone 3, lifting district 4, isothermal region 5, buffer zone 6 and discharge zone 7 is provided with furnace roller 8, and furnace roller 8 travelling speed in each district all independently regulate; In order further effectively to reduce the temperature gradient of stove entirety, reduce superheating temperature, stress is fully discharged, the blower fan 201 of residual heat exchanging chamber 20 and residual heat exchanging chamber 20 over top can be set between feeding area 1 and heating zone 2.
For effective enhancing is diathermanous, make the abundant solid solution of steel pipe also can reduce the superheating temperature of steel pipe, above furnace roller 8, be provided with shielding gas passage 9, on shielding gas passage 9, be provided with gas orifice 91; The below of furnace roller 8 is provided with furnace bottom heater strip 10; Feeding area 1 comprise feeding table 11 with for fixing feeding table 11 and the bracing frame 12 vertical with feeding table 11, feeding table front end is provided with the slideway 13 perpendicular with feeding table 11, preferably ladder-shaped of feeding table 11.The front portion of feeding table 11 is fixed with blocking material plate 14, is also fixed with for material being pushed to the propulsion cylinder 15 in the first heating zone 2 on bracing frame 12, and the both sides of feeding table 11 are provided with baffle plate 16.In heating zone 2, be provided with temperature control unit 23, temperature control unit 23 comprises thermocouple wire, compensating lead wire, PLC control panel and temperature measurement node (not illustrating in the drawings).Between buffer zone 6 and discharge zone 7, be provided with protective atmosphere cooling zone 61.Protective atmosphere is Sweet natural gas preferably.
For controlling more accurately the temperature of heating zone, between the first heating zone 2 and heat preservation zone 3, be provided with the first gas isolating district 21; Between the second heating zone 4 and isothermal region 5, be provided with the second gas isolating district 22; In the first gas isolating district 21 and the second gas isolating district 22, be provided with shielding gas refrigerating unit 211.
Fig. 4 is grain fineness number and the tissue topography's image that utilizes the high-silicon austenite stainless steel forming after the steel pipe processing that the present embodiment annealing furnace is φ 57 × 3mm to steel pipe 00Cr16Ni14Si4 stainless steel, specification.
This specific embodiment is only to explanation of the present utility model; it is not to restriction of the present utility model; those skilled in the art are reading after this specification sheets and can make to the present embodiment the amendment that there is no creative contribution as required, but as long as within the scope of claim of the present utility model, are all subject to the protection of patent law.
Claims (6)
1. a long-range roller-hearth solution annealing furnace, adopt roller bottom type structure, it is characterized in that: described annealing furnace comprises the feeding area (1), the first heating zone (2), heat preservation zone (3), the second heating zone (4), isothermal region (5), buffer zone (6) and discharge zone (7) that communicate successively;
The bottom of described feeding area (1), heating zone (2), heat preservation zone (3), lifting district (4), isothermal region (5), buffer zone (6) and discharge zone (7) is provided with furnace roller (8), and furnace roller (8) travelling speed in described each district all independently regulates;
The top of described furnace roller (8) is provided with shielding gas passage (9), is provided with gas orifice (91) on described shielding gas passage (9); The below of described furnace roller (8) is provided with furnace bottom heater strip (10);
Described feeding area (1) comprise feeding table (11) with for fixing feeding table (11) and the bracing frame (12) vertical with described feeding table (11), described feeding table front end is provided with the slideway (13) perpendicular with described feeding table (11), the front portion of described feeding table (11) is fixed with blocking material plate (14), on support frame as described above (12), be also fixed with for material being pushed to the propulsion cylinder (15) in described the first heating zone (2), the both sides of described feeding table (11) are provided with baffle plate (16).
2. a kind of long-range roller-hearth solution annealing furnace according to claim 1, is characterized in that: between described the first heating zone (2) and heat preservation zone (3), be provided with the first gas isolating district (21); Between described the second heating zone (4) and isothermal region (5), be provided with the second gas isolating district (22); In described the first gas isolating district (21) and the second gas isolating district (22), be provided with shielding gas refrigerating unit (211).
3. a kind of long-range roller-hearth solution annealing furnace according to claim 2, is characterized in that: between described buffer zone (6) and discharge zone (7), be provided with protective atmosphere cooling zone (61).
4. a kind of long-range roller-hearth solution annealing furnace according to claim 3, it is characterized in that: in described the first heating zone (2), be provided with temperature control unit (23), described temperature control unit (23) comprises thermocouple wire, compensating lead wire, PLC control panel and temperature measurement node.
5. a kind of long-range roller-hearth solution annealing furnace according to claim 4, is characterized in that: the blower fan (201) that is provided with residual heat exchanging chamber (20) and residual heat exchanging chamber (20) over top between described feeding area (1) and the first heating zone (2).
6. according to a kind of long-range roller-hearth solution annealing furnace described in claim 1-5 any one, it is characterized in that: described feeding table (11) is ladder-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227329.7U CN203846060U (en) | 2014-05-06 | 2014-05-06 | Long-range roller hearth type solid solution annealing furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227329.7U CN203846060U (en) | 2014-05-06 | 2014-05-06 | Long-range roller hearth type solid solution annealing furnace |
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| CN203846060U true CN203846060U (en) | 2014-09-24 |
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| CN201420227329.7U Expired - Fee Related CN203846060U (en) | 2014-05-06 | 2014-05-06 | Long-range roller hearth type solid solution annealing furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103981338A (en) * | 2014-05-06 | 2014-08-13 | 湖州华恒不锈钢有限公司 | Long-range roller-hearth solid solution annealing furnace and method for improving silicon content of austenitic stainless steel product by using same |
| CN106435414A (en) * | 2016-08-30 | 2017-02-22 | 赫菲斯热处理***江苏有限公司 | Roller hearth nitrogen-based gas shield annealing furnace full-automatic production line |
-
2014
- 2014-05-06 CN CN201420227329.7U patent/CN203846060U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103981338A (en) * | 2014-05-06 | 2014-08-13 | 湖州华恒不锈钢有限公司 | Long-range roller-hearth solid solution annealing furnace and method for improving silicon content of austenitic stainless steel product by using same |
| CN106435414A (en) * | 2016-08-30 | 2017-02-22 | 赫菲斯热处理***江苏有限公司 | Roller hearth nitrogen-based gas shield annealing furnace full-automatic production line |
| CN106435414B (en) * | 2016-08-30 | 2018-08-03 | 赫菲斯热处理***江苏有限公司 | A kind of roller-bottom type nitrogen-based gas protection annealing furnace automatic production line |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20160506 |