CN101974677B - Online concurrent heating annealing process of round steel bars and production line thereof - Google Patents
Online concurrent heating annealing process of round steel bars and production line thereof Download PDFInfo
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- CN101974677B CN101974677B CN201010536752A CN201010536752A CN101974677B CN 101974677 B CN101974677 B CN 101974677B CN 201010536752 A CN201010536752 A CN 201010536752A CN 201010536752 A CN201010536752 A CN 201010536752A CN 101974677 B CN101974677 B CN 101974677B
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Abstract
The invention belongs to the technical field of heat treatment of steel, and discloses an online concurrent heating annealing process of round steel bars and a production line thereof. The process comprises the following process flows: collecting high-temperature steel from a cooling table; and directly charging the high-temperature steel into a furnace for annealing. The production line comprises a stepwise or steel-pulling type cooling table and a trolley type resistance annealing furnace, wherein the furnace body of the trolley type resistance annealing furnace is arranged on a second auxiliary straddle in a north-south direction; a trolley of the trolley type resistance annealing furnace is arranged on a first auxiliary straddle in the north-south direction; and the stepwise or steel-pulling type cooling table and the trolley of the trolley type resistance annealing furnace are positioned in the first auxiliary straddle. The process can make [H] sufficiently diffuse and escape to prevent white spot defects generated inside the bars; in the process, a heat charging process can be adopted conveniently to ensure that the initial temperature of the annealing furnace can reach 400 to 580 DEG C, thereby greatly reducing the energy consumption; and the steel is charged into the furnace directly after being collected from the cooling table, thereby shortening the production cycle by about 20 hours, and improving the labor productivity.
Description
Technical field
The invention belongs to the steel heat processing technology field, a kind of specifically round steel bar on-line concurrent heating annealing process and production line thereof.
Background technology
In the prior art, round steel bar on-line annealing process annealing furnace is two pallet car type electric resistance annealing stoves, every stove resistance rated output is 1650kw, 800 ℃ of maximum operating temperatures, stove car maximum load-carrying capacity is 120 tons, the fire box temperature homogeneity can be controlled in ± 10 ℃ of scopes in, heat-up rate can reach 100 ℃/h during the steel hot charging, during cold charge≤and 40 ℃/h, heat-up rate can preestablish, automatic and adjustable.Body of heater is arranged in the second mate and strides three posts of North and South direction apart from the position, the stove car is exposed to the north and reaches a pair and stride, stove car and cold bed are positioned at same striding, bar directly gets off from cold bed, loads and unloads material, and logistics is smooth and easy, be convenient to realize hot-mounting process, furnace type structure adopts the pallet car type type of furnace, and half hole formula is placed, and can be convenient to the workman like this and carry out the hot charging operation.
Along with the product development dynamics continues to increase, product specification constantly promotes, and according to different customer requirements, needs anneal before many steel grade delivery.For example: stone oil drill collar Jumper Steel, super critical boiler steel, high-grade rolling bearing steel, mooring chain steel etc.
Conventional round steel steel are generally the off-line thermal treatment process when annealing, adopts the following technical process production of annealing: the cold steel shove charge of cold bed collection---going into to cheat slow cooling---is annealed.This technology has following weak point: (1) is taken off [H] to the electric furnace vacuum and is had relatively high expectations, if [H] content is higher in the steel, be easy to generate white point for the steel grade of white point sensitivity in the annealing process going into to cheat, even anneal again in the back, can not eliminate, thereby cause the steel internal soundness defective; (2) cold charge steel heat-up rate is slower, makes the power consumption height; (3) steel go out to cheat shove charge after going into the hole again, and the production cycle is long, and labour intensity is big.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming at above prior art exists, a kind of round steel bar on-line concurrent heating annealing process is proposed, and can effectively go [H] to prevent that white point from producing, the energy-conservation reduction power consumption of hot charging shortens the annealing material production cycle.
The technical scheme that the present invention solves above technical problem is:
Round steel bar on-line concurrent heating annealing process, undertaken by following technical process: cold bed is collected---the direct shove charge annealing of high temperature steel.
Specifically carry out according to the following steps:
(1) according to the required charging temperature of each steel grade, control the cold bed stepping rate well, make that having higher cold bed behind the cold bed under the bar collects temperature;
(2) will be with warm steel to install on the annealing furnace chassis, production shove charge while collecting in limit is up near the annealing furnace supporting capacity;
(3) chassis is sent in the annealing furnace burner hearth, closed upper furnace door, and compress all side seals, wait for 15～25 minutes, tend towards stability, rely on this moment the waste heat diffusion of hot charging steel to make that the temperature field is more even in the burner hearth up to each district's temperature;
(4) according to this steel grade annealing process curve, it is 70～100 ℃/h that heat-up rate is set, and beginning is heating automatically, and be 1.5～2.5 hours the heat-up time of heating up.
Round steel bar on-line concurrent heating anneling production line, comprise walking beam cooler and pallet car type electric resistance annealing stove, pallet car type electric resistance annealing furnace body is arranged in the second mate and strides North and South direction, pallet car type electric resistance annealing table car is arranged in a pair and strides North and South direction, and walking beam cooler and pallet car type electric resistance annealing table parking stall are in a pair is striden.
The technical scheme that the present invention further limits is:
Aforesaid round steel bar on-line concurrent heating annealing process, in the step (1), the walking beam cooler rate of advance is 1.5～1.8 meters/minute, drawing steel formula cold bed rate of advance is 2.8～3.5 meters/minute.
Aforesaid round steel bar on-line concurrent heating annealing process, in the step (1), it is 600～660 ℃ that the cold bed under the bar behind the cold bed is collected temperature.
Aforesaid round steel bar on-line concurrent heating annealing process, in the step (3), each is distinguished temperature and tends towards stability at 400～580 ℃.
Advantage of the present invention is: (1) makes [H] fully diffusion effusion, prevents the inner white-spot defects that produces of bar; (2) be convenient to take hot charging furnaceman skill, make the annealing furnace initial temperature can reach 400～580 ℃, thereby make energy consumption reduce significantly; (3) steel are collected directly shove charge of back from cold bed, have shortened about 20 hours of production cycle, have improved labour productivity.
After implementing this invention, make unit consumption of energy reduce significantly.Calculate by every month 300 tons (4 stoves divide 2 batch processed), the online concurrent heating of steel is annealed initial charging temperature by 400 ℃ of settings, every stove steel can be saved 10 hours/stove heat-up time, per hour current consumption is by 550 degree/hour calculating, every degree is electric to be calculated by 0.65 yuan/degree, and the material ton steel direct benefit of then annealing is: 10 hours/stove * 4 stoves * 550 degree/hour * 0.65 yuan/spend/300 tons=48 yuan/ton.
Description of drawings
Fig. 1 is the layout synoptic diagram of production line of the present invention.
Embodiment
Embodiment one
Present embodiment is a kind of round steel bar on-line concurrent heating annealing process, is undertaken by following technical process: cold bed is collected---the direct shove charge annealing of high temperature steel, specifically carry out according to the following steps:
According to the required charging temperature of each steel grade, control the cold bed stepping rate well, make that having higher cold bed behind the cold bed under the bar collects temperature, the walking beam cooler rate of advance is 1.4 meters/minute, drawing steel formula cold bed rate of advance is 2.8 meters/minute, and it is 600 ℃ that the cold bed under the bar behind the cold bed is collected temperature;
To be with warm steel to install on the annealing furnace chassis, production shove charge while collecting in limit is up near the annealing furnace supporting capacity;
Chassis is sent in the annealing furnace burner hearth, closes upper furnace door, and compresses all side seals, waits for 15 minutes, tends towards stability up to each district's temperature, relies on this moment the waste heat of hot charging steel to spread in the burner hearth and has made that the temperature field is more even, and each is distinguished temperature and tends towards stability at 400 ℃.
According to this steel grade annealing process curve, it is 70 ℃/h that heat-up rate is set, and beginning is heating automatically, and heating up and needing heat-up time is 1.5 hours.
The round steel bar on-line concurrent heating anneling production line of present embodiment as shown in Figure 1, comprise that No. 1 walking beam cooler advances 2, No. 1 pallet car type electric resistance annealing stove 3 of formula cold bed and No. 2 pallet car type electric resistance annealing stoves 4 for 1, No. 2, No. 1 pallet car type electric resistance annealing stove 3 and No. 2 pallet car type electric resistance annealing stove 4 bodies of heater are arranged in the second mate and stride North and South direction, No. 1 annealing furnace chassis 5 and No. 2 annealing furnace chassis 6 are arranged in a pair and stride North and South direction, and walking beam cooler and pallet car type electric resistance annealing table parking stall are in a pair is striden.
Round steel bar on-line concurrent heating annealing can be eliminated unrelieved stress except conventional annealing has, reduced hardness, improve the effect of structure property, also have three characteristics: the one, make [H] fully diffusion effusion, prevent to produce white-spot defects, steel billet is generally hot-loading and hot-conveying in the prior art, be unfavorable for separating out of residual gas in the steel-making continuous casting base (particularly hydrogen and nitrogen), and the control of [H] content is unstable in the steel, can in time anneal after rolling the becoming a useful person, to remove of the influence of these residual gass to the steel internal soundness; The 2nd, conveniently take pole material hot charging furnaceman skill, make the annealing furnace initial temperature can reach 400～580 ℃, thereby make energy consumption reduce significantly; The 3rd, steel are collected directly shove charge of back from cold bed, have saved the gentle cool time of operation of going into the hole and going out the hole, have shortened about 20 hours of production cycle, have improved labour productivity.
Embodiment two
Present embodiment is a kind of round steel bar on-line concurrent heating annealing process, is undertaken by following technical process: cold bed is collected---the direct shove charge annealing of high temperature steel, specifically carry out according to the following steps:
According to the required charging temperature of each steel grade, control the cold bed stepping rate well, make that having higher cold bed behind the cold bed under the bar collects temperature, the walking beam cooler rate of advance is 1.6 meters/minute, drawing steel formula cold bed rate of advance is 3.0 meters/minute, and it is 630 ℃ that the cold bed under the bar behind the cold bed is collected temperature;
To be with warm steel to install on the annealing furnace chassis, production shove charge while collecting in limit is up near the annealing furnace supporting capacity;
Chassis is sent in the annealing furnace burner hearth, closes upper furnace door, and compresses all side seals, waits for 20 minutes, tends towards stability up to each district's temperature, relies on this moment the waste heat of hot charging steel to spread in the burner hearth and has made that the temperature field is more even, and each is distinguished temperature and tends towards stability at 500 ℃.
According to this steel grade annealing process curve, it is 80 ℃/h that heat-up rate is set, and beginning is heating automatically, and heating up and needing heat-up time is 2.0 hours.
The round steel bar on-line concurrent heating anneling production line of present embodiment is identical with embodiment one.
Embodiment three
Present embodiment is a kind of round steel bar on-line concurrent heating annealing process, is undertaken by following technical process: cold bed is collected---the direct shove charge annealing of high temperature steel, specifically carry out according to the following steps:
According to the required charging temperature of each steel grade, control the cold bed stepping rate well, make that having higher cold bed behind the cold bed under the bar collects temperature, the walking beam cooler rate of advance is 1.8 meters/minute, drawing steel formula cold bed rate of advance is 3.5 meters/minute, and it is 660 ℃ that the cold bed under the bar behind the cold bed is collected temperature;
To be with warm steel to install on the annealing furnace chassis, production shove charge while collecting in limit is up near the annealing furnace supporting capacity;
Chassis is sent in the annealing furnace burner hearth, closes upper furnace door, and compresses all side seals, waits for 25 minutes, tends towards stability up to each district's temperature, relies on this moment the waste heat of hot charging steel to spread in the burner hearth and has made that the temperature field is more even, and each is distinguished temperature and tends towards stability at 580 ℃.
According to this steel grade annealing process curve, it is 100 ℃/h that heat-up rate is set, and beginning is heating automatically, and heating up and needing heat-up time is 2.5 hours.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (5)
1. round steel bar on-line concurrent heating annealing process is characterized in that: undertaken by following technical process: cold bed is collected---the direct shove charge annealing of high temperature steel;
Specifically carry out according to the following steps:
(1) according to the required charging temperature of each steel grade, control the cold bed rate of advance well, make that having higher cold bed behind the cold bed under the bar collects temperature;
(2) will be with warm steel to install on the annealing furnace chassis, production shove charge while collecting in limit is up near the annealing furnace supporting capacity;
(3) chassis is sent in the annealing furnace burner hearth, closed upper furnace door, and compress all side seals, wait for 15～25 minutes, tend towards stability, rely on this moment the waste heat diffusion of hot charging steel to make that the temperature field is more even in the burner hearth up to each district's temperature;
(4) according to this steel grade annealing process curve, it is 70～100 ℃/h that heat-up rate is set, and beginning is heating automatically, and be 1.5～2.5 hours the heat-up time of heating up.
2. round steel bar on-line concurrent heating annealing process as claimed in claim 1, it is characterized in that: in the described step (1), the walking beam cooler rate of advance is 1.5～1.8 meters/minute, drawing steel formula cold bed rate of advance is 2.8～3.5 meters/minute.
3. round steel bar on-line concurrent heating annealing process as claimed in claim 1 is characterized in that: in the described step (1), it is 600～660 ℃ that the cold bed under the bar behind the cold bed is collected temperature.
4. round steel bar on-line concurrent heating annealing process as claimed in claim 1 is characterized in that: in the described step (3), each is distinguished temperature and tends towards stability at 400～580 ℃.
5. the production line that is used for the described round steel bar on-line of the arbitrary right of claim 1-4 concurrent heating annealing process, it is characterized in that: comprise walking beam cooler and pallet car type electric resistance annealing stove, described pallet car type electric resistance annealing furnace body is arranged in the second mate and strides North and South direction, described pallet car type electric resistance annealing table car is arranged in a pair and strides North and South direction, and described walking beam cooler and pallet car type electric resistance annealing table parking stall are in a pair is striden.
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| CN201010536752A CN101974677B (en) | 2010-11-09 | 2010-11-09 | Online concurrent heating annealing process of round steel bars and production line thereof |
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| CN201010536752A CN101974677B (en) | 2010-11-09 | 2010-11-09 | Online concurrent heating annealing process of round steel bars and production line thereof |
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| CN101974677B true CN101974677B (en) | 2011-12-07 |
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| CN112831632B (en) * | 2021-01-04 | 2022-05-20 | 南京钢铁股份有限公司 | Online normalizing method for SAE1050M round steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139198A (en) * | 1995-04-24 | 1997-01-01 | 洛伊热处理有限公司 | Method and furnaces for heat treatment of workpieces |
| CN1858269A (en) * | 2005-05-20 | 2006-11-08 | 鞍钢新轧钢股份有限公司 | Annealing treating process for cold rolled steel coil |
| CN101153355A (en) * | 2006-09-30 | 2008-04-02 | 大冶特殊钢股份有限公司 | Machining method for improving internal soundness and capability of large scale rod bar |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144254A (en) * | 1998-11-18 | 2000-05-26 | Nagano Japan Radio Co | Tool for annealing treatment of sheet core |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139198A (en) * | 1995-04-24 | 1997-01-01 | 洛伊热处理有限公司 | Method and furnaces for heat treatment of workpieces |
| CN1858269A (en) * | 2005-05-20 | 2006-11-08 | 鞍钢新轧钢股份有限公司 | Annealing treating process for cold rolled steel coil |
| CN101153355A (en) * | 2006-09-30 | 2008-04-02 | 大冶特殊钢股份有限公司 | Machining method for improving internal soundness and capability of large scale rod bar |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2000-144254A 2000.05.26 |
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