CN104745790B - Method for softening and rolling cold forging steel - Google Patents
Method for softening and rolling cold forging steel Download PDFInfo
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- CN104745790B CN104745790B CN201510168693.XA CN201510168693A CN104745790B CN 104745790 B CN104745790 B CN 104745790B CN 201510168693 A CN201510168693 A CN 201510168693A CN 104745790 B CN104745790 B CN 104745790B
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Abstract
The invention discloses a method for softening and rolling a cold forging steel. The main process flow comprises the steps of heating, rolling, performing finish rolling, spinning, performing Stelmor roller controlled cooling, collecting, transporting, bundling, performing coil discharging, keeping the temperature in a temperature controlled chamber and performing stack cooling, wherein after collecting is finished, the cold forging steel coil is put to a P-F transportation line and the steel coil is rapidly transferred to a bander along a straight line rail; after coil discharging is finished, the steel coil is put to the temperature controlled chamber and slowly operates in the temperature controlled chamber until the temperature is 400-460 DEG C when the steel coil reaches the outlet; and finally stack cooling is performed to achieve room temperature. By adopting the method, the problems of low plasticity of the steel material and easy cracking of the cold forging steel due to integrated inner stress of the rolled cold forging steel are solved, the deep processing capability of the steel material is increased and the non-annealing of the cold forging steel is realized.
Description
Technical field
The invention belongs to iron and steel pressure processing technology field is and in particular to a kind of give birth to for steel industry high-speed rod-rolling mill
Produce the softening rolling processing method of light coil rod cold-forging steel reinforcing bar.
Background technology
The demand of domestic cold heading and cold extruding steel is just stepped up at present, and annual requirement has reached 10,000,000 more than t, and 8.8
Level and above cold-forging steel fastener products ratio improve year by year, have reached the 60% ~ 70% of securing member total amount.Produce 8.8 grades
And its raw material of above high-level securing member generally in the high strength steel such as carbon or medium carbon alloy steel, material has relatively in itself
High intensity and hardness, plasticity index is relatively poor.Securing member processing enterprise, before producing, need to carry out nodularization to this kind of steel
Annealing, cold-heading again after making steel soften, so also can reduce the loss of mould while improving cold-formed qualification rate.Plus
Annealing operation before work cause energy resource consumption, metal loss and pollution environment, according to measuring and calculating, steel annealing expense per ton be 160 ~
180 yuan about.With the reinforcement of environmental protection, energy saving consciousness, highly desirable steel mill of securing member processing enterprise provides can be straight
Tap into the high intensity non-annealed steel of row cold-heading, the requirement reaching energy-saving, reduces cost and shortening the production cycle.Therefore produce
High intensity non-annealed cold-forging steel has important practical significance.
Existing many steel mills have carried out exempting from the research and development of high-intensity fasteners steel of annealing both at home and abroad, and its major technique is to height
Strength fastener carries out online soft annealing with steel, and this key problem in technology is exactly that the operation of rolling adopts deformation induced trans- formation, carries out
Low temperature large deformation fining austenite grains, the dislocation density increasing in matrix, form spherical in follow-up control cooling procedure
Or nodular cementite.Using the online steel for fastener softening and producing, the steel for fastener of the more conventional technique productions of hardness strength
Significantly reduce, the contraction percentage of area, plastic deformation ability significantly improve.
Currently for the online main method softening of cold-forging steel greatly to there being three classes: the first kind is application " deformation induced phase
The theory of change ", uses the means of " low temperature heavy reduction " to allow steel carry out aximal deformation value deformation in two-phase (γ+α) area, reaches during rolling
To refinement pearlite interlaminar spacing and accelerate the purpose of its nodularization, this is also to realize the important channel that online cold-forging steel softens at present
One of (cn200410103089.0)；The method that Equations of The Second Kind softens cold-forging steel online is using common process rolling, by steel
Material composition adjustment, reduces the content of alloying element in steel so that the intensity of steel declines, plasticity index improves
(cn201410088703.4, cn201310131180.2)；3rd class is substantially to be also adopted by pair rolling method, reduces spinning temperature
Degree, makes steel long-time heat preservation slow cooling on stelmor roller-way cooling line carry out isothermal transformation, and then softens steel
(cn201210179243.7, cn200710022170.x).
This three classes method is each advantageous, but there is also deficiency.The advantage of first kind method is that the effect softening steel is bright
Aobvious, but the requirement to Technology and producing equipment is higher, and rolling difficulty is larger, and spare parts consumption is high, especially rolls in commonly high line
Smooth manufacturing feasibility is realized on machine less；Equations of The Second Kind method is rolled by reducing the alloying element commonsense method in steel
Can achieve the intensity reducing steel, but problem is the possible intensity affecting securing member, hardenability, quenching degree etc.；3rd class side
The shortcoming of method is that steel need long-time heat preservation slow cooling on stelmor roller-way cooling line, and the time is longer, rolls for single line
Machine is practically impossible to realization, even it is also extremely difficult that four lines rollings will realize normal economical production.
In sum, soften the more effective milling method of cold-forging steel at present based on " deformation induced trans- formation " theory, make to roll
Part rolls under the conditions of " low temperature heavy reduction " and realizes softening, but this technique is realized and batch warp on common high-speed wire mill
The difficulty that Ji produces cold-forging steel is larger, limited by popularization and application.
For this reason, developing one kind on the basis of pair rolling technique, the softening reducing the cold-forging steel of coil of strip temperature drop is rolled
Method processed.
Content of the invention
It is an object of the invention to provide one kind is on the basis of pair rolling technique, reduce the cold-forging steel of coil of strip temperature drop
Softening rolling method.
The object of the present invention is achieved like this, and the technical process of the softening rolling method of described cold-forging steel includes adding
Heat → open rolling → finish rolling → spinning → stelmor roller-way control is cold → and collection volume → transport → bundling → unload volume → temperature-controlling chamber is incubated →
Heap is cold.
Specifically comprise the following steps that
Cold-forging steel steel billet feeding gas-fired furnace is carried out heating, open rolling, finish rolling, enters Laying head spinning, send into this too
You rub roller-way 1 control cold, enter collection reel 2 collection volume；
After collection volume, cold-forging steel coil of strip enters p-f supply line 7, along rectilinear orbit delivery coil of strip to baler 3；Transportation
Stopper on described p-f supply line 7 does not work, and the travelling speed of p-f supply line 7 is 20 ~ 22 m/min；
After bundling, steel roll temperature is 600 ~ 660 DEG C, then carry out weighing, identify after unload volume, after unloading volume steel roll temperature be 540 ~
600℃；
After unloading volume, coil of strip enters temperature-controlling chamber 4, adjusts the coil of strip speed of service to control cooling rate to be 1.2 ~ 4.0 DEG C/m, arrives
Reach steel roll temperature during outlet 10 and be 400 ~ 460 DEG C；
Coil of strip goes out temperature-controlling chamber 4, and heap is cooled to room temperature.
Beneficial effects of the present invention:
(1) present invention does not need high-speed rod-rolling mill in the online softening that can achieve cold-forging steel compared with zerolling, rolling
Process is simple, accident rate are low；
(2) present invention solves high-speed rod-rolling mill rolling cold-forging steel and need to be incubated the long period on stelmor roller-way
Problem, improves production efficiency；
(3) present invention is by can achieve various cold-headings to the adjustment of rolling temperature, travelling speed, temperature-controlling chamber's temperature retention time
The online sofening treatment of steel；
(4) present invention does not affect the function of existing equipment to the improvement of equipment and newly added equipment, and the mode of production can be free
Switching, can be achieved with the online sofening treatment of cold-forging steel using steel itself waste heat, and steel can achieve before securing member processing exempts from
Annealing, has the characteristics that economy, environmental protection.
In sum, present invention efficiently solves the cold-forging steel after rolling is concentrated due to internal stress and caused moulding of steel
Property not high, the problems such as cold-heading is easy to crack, improve the deep processing ability of steel, realize cold-forging steel exempt from anneal.
Brief description
Fig. 1 is that cold-forging steel coil of strip transports temperature-controlling chamber's structural relation schematic diagram from collecting reel；
In figure: 1- stelmor roller-way, 2- collection reel, 3- baler, 4- temperature-controlling chamber, 5- railway switch, 6- direct connection track, 7-
P-f supply line, 8- unloads at volume.
Fig. 2 is the top view of temperature-controlling chamber；
In figure: 9- entrance, 10- exports, 11- step rate, 12- machine for moving steel.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings, but never in any form the present invention is any limitation as, and is based on
Present invention teach that any conversion made, each fall within the scope of the present invention.
As shown in figure 1, the technical process of the present invention includes heating → open rolling → finish rolling → spinning → stelmor roller
Road control is cold → and collection volume → transport → bundling → unload volume → temperature-controlling chamber's insulation → heap is cold.Specifically comprise the following steps that
Cold-forging steel steel billet feeding gas-fired furnace is heated, heating-up temperature is 1100 ~ 1250 DEG C, and start rolling temperature is
1010 ~ 1060 DEG C, final rolling temperature is 915 ~ 945 DEG C, enters back into Laying head spinning, and laying temperature is 910 ~ 940 DEG C.
Then, send into stelmor roller-way 1 and control cold, first section travelling speed is 0.40 ~ 0.50m/s, and latter end travelling speed is
0.50 ~ 0.70m/s, interlude is cascade speed governing；Blower fan on described stelmor roller-way 1, insulation shroud Close All.Subsequently
Enter collection reel 2 collection volume, collection volume temperature is 780 ~ 820 DEG C.
After collection volume, cold-forging steel coil of strip enters p-f supply line 7, along rectilinear orbit delivery coil of strip to baler 3.Transportation
Open the wholly off device on described p-f supply line 7 so that stopper no longer hinders track to run, adjust p-f supply line 7
Travelling speed is 20 ~ 22m/min.Wherein, the p-f line conveying track of high line is typically by multiple u shape tracks and rectilinear orbit institute structure
Become, and the present invention pass through collection reel 2 and baler 3 between p-f supply line 7 on each u shape track enter end install additional turn
Rut device 5, then direct connection track 6 is installed the discrepancy two ends straight line of u shape track is connected, thus forming whole rectilinear orbits, shorten
The transportation range of coil of strip.
After bundling, steel roll temperature is 600 ~ 660 DEG C, then carry out weighing, identify after unload volume, after unloading volume steel roll temperature be 540 ~
600℃；
After unloading volume, coil of strip enters temperature-controlling chamber 4, adjusts the coil of strip speed of service to control cooling rate to be 1.2 ~ 4.0 DEG C/m, arrives
Reach steel roll temperature during outlet 10 and be 400 ~ 460 DEG C.Described temperature-controlling chamber 4 includes entrance 9 and outlet 10, entrance 9 and outlet 10
Connected by step rate 11.If the quantity 1 of step rate, then step rate is connected by machine for moving steel 12 between any two.
Coil of strip goes out temperature-controlling chamber 4, and heap is cooled to room temperature.
One kind as the present invention is preferred, and the top of temperature-controlling chamber 4 and surrounding body of wall are double-decker, and outer layer is concrete
Layer, internal layer is adiabator layer.Insulation material may be selected fire resisting asbestos, rock wool etc..
A kind of preferred as the present invention, described temperature-controlling chamber may be disposed at the lower section on cold-forging steel coil of strip heap awkward silence at a meeting ground, no longer
Take more places.
Embodiment 1: cold-forging steel softening rolling contrast test
From three kinds of steel grades such as 10b21, ml20mntib, ml 35crmo as test material, rolling specs respectively 12,
16、20mm.The batch batch of every kind of steel grade is identical, then is classified as test group and matched group, and every group of production quantity is 10
Group wire rod.All wire rods produce all on same high-speed wire production line, and the production method of matched group produces work using conventional
Skill, that is, heating-up temperature be 1120 ~ 1170 DEG C, start rolling temperature is 950 ~ 985 DEG C, and final rolling temperature is 850 ~ 870 DEG C, and laying temperature is
820 ~ 860 DEG C, the blower fan on stelmor roller-way, insulation shroud Close All, first section travelling speed is 0.20 ~ 0.30m/s, end
Section travelling speed is 0.30 ~ 0.40m/s, collects 630 ~ 670 DEG C of temperature of volume, by the cooling of pf supply line, bundling, naturally sky after collection volume
Cold, the production method of test group adopts the production technology of the present invention.In production process, the blower fan on stelmor roller-way, insulation
Cover lid Close All.
Temperature-controlling chamber is arranged on the underground on cold-forging steel coil of strip heap awkward silence at a meeting ground, length × width × height is 20m × 20m × 3.5m, enters
Mouth and outlet are located at temperature-controlling chamber's top diagonal angle respectively, are connected by the step rate that 5 minister's degree arranged in parallel are 16m, stepping
Beam is connected by 4 machine for moving steel between any two respectively, and effective overall length of 5 step rates amounts to 80m.The top of temperature-controlling chamber and surrounding
Body of wall is double-decker, and outer layer is concrete layer, and internal layer is fire resisting asbestos layer.Indoor, the speed of service of step rate in this temperature control
For 1.2 ~ 1.5m/min, to control cooling rate to be 1.2 ~ 4.0 DEG C/m, reach steel roll temperature during outlet and be 400 ~ 460 DEG C,
The whole service time is about 50 ~ 70 min.
Concrete technology is with reference to as shown in table 1.
1 three kinds of cold-forging steel steel grade softening rolling contrast test technological parameters of table
Embodiment 2: steel process performance index test
By measuring steel material mechanical index, the cold-forging steel processing performance of matched group, test group in comparing embodiment 1.Result
As shown in table 2, in table, data is the meansigma methodss of matched group and each 10 groups of wire rods of test group.
Table 2 steel process performance index test result
* note: section shrinkage raising=test group shrinkage factor-matched group shrinkage factor
As shown in Table 2, the cold-forging steel bating effect being produced using the inventive method is notable.Additionally, after product batch production,
Use through downstream user, fully achieved and exempted from the annealing each rank standard component of production, effectively reduced production cost.The present invention meets
Economical production, energy-saving, environmental protection industrial development direction.
Claims (9)
1. a kind of softening rolling method of cold-forging steel is it is characterised in that technical process includes heating → open rolling → finish rolling → tell
The roller-way control of silk → stelmor is cold → and collection volume → transport → bundling → unload volume → temperature-controlling chamber's insulation → heap is cold；Specifically comprise the following steps that
Cold-forging steel steel billet feeding gas-fired furnace is carried out heating, open rolling, finish rolling, enters Laying head spinning, send into stelmor
Roller-way (1) control is cold, enter collection reel (2) collection volume；
After collection volume, cold-forging steel coil of strip enters p-f supply line (7), transports to baler (3) along rectilinear orbit；Described in transportation
Stopper on p-f supply line (7) does not work, and the travelling speed of p-f supply line (7) is 20 ~ 22m/min；
After bundling, steel roll temperature is 600 ~ 660 DEG C, then carry out weighing, identify after unload volume, after unloading volume, steel roll temperature is 540 ~ 600
℃；
After unloading volume, coil of strip enters temperature-controlling chamber (4), adjusts the coil of strip speed of service to control cooling rate to be 1.2 ~ 4.0 DEG C/m, reaches
Steel roll temperature during outlet (10) is 400 ~ 460 DEG C；
Coil of strip goes out temperature-controlling chamber (4), and heap is cooled to room temperature.
2. the softening rolling method of cold-forging steel according to claim 1 is it is characterised in that the technological temperature of described heating is
1100 ~ 1250 DEG C, the technological temperature of described open rolling is 1010 ~ 1060 DEG C, and the technological temperature of described finish rolling is 915 ~ 945 DEG C, institute
State spinning step temperature and be 910 ~ 940 DEG C, the temperature of described collection volume step is 780 ~ 820 DEG C.
3. the softening rolling method of cold-forging steel according to claim 1 is it is characterised in that Cold Heading Steel Wire is in stelmor
When roller-way (1) control is cold, first section travelling speed is 0.40 ~ 0.50m/s, and latter end travelling speed is 0.50 ~ 0.70m/s, and interlude is
Cascade speed governing；Blower fan on described stelmor roller-way (1), insulation shroud Close All.
4. the softening rolling method of cold-forging steel according to claim 1 is it is characterised in that form the side of described rectilinear orbit
Method is along delivery direction, the entering of each u shape track on the p-f supply line (7) between collection reel (2) and baler (3)
Hold and install railway switch (5) additional, then direct connection track (6) is installed and the discrepancy two ends straight line of u shape track is connected.
5. cold-forging steel according to claim 1 softening rolling method it is characterised in that described temperature-controlling chamber (4) include into
Mouth (9) and outlet (10), described entrance (9) is connected by step rate (11) with outlet (10).
6. the softening rolling method of cold-forging steel according to claim 5 is it is characterised in that lead between described step rate (11)
Cross machine for moving steel (12) to connect.
7. cold-forging steel according to claim 5 softening rolling method it is characterised in that the top of described temperature-controlling chamber (4) and
Surrounding body of wall is double-decker, and outer layer is concrete layer, and internal layer is adiabator layer.
8. the softening rolling method of cold-forging steel according to claim 7 is it is characterised in that described adiabator layer is resistance to
Flint cotton.
9. the softening rolling method of the cold-forging steel according to claim 1,5 or 7 is it is characterised in that described temperature-controlling chamber (4) position
Underground in cold-forging steel coil of strip heap awkward silence at a meeting ground.
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| CN201510168693.XA CN104745790B (en) | 2015-04-10 | 2015-04-10 | Method for softening and rolling cold forging steel |
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| CN201510168693.XA CN104745790B (en) | 2015-04-10 | 2015-04-10 | Method for softening and rolling cold forging steel |
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| CN104745790B true CN104745790B (en) | 2017-01-25 |
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| CN111659731B (en) * | 2020-05-25 | 2022-02-01 | 中天钢铁集团有限公司 | Pearlite spheroidizing method based on high-speed wire rod production line |
| CN114247750B (en) * | 2021-11-17 | 2024-01-23 | 邢台钢铁有限责任公司 | Process for improving stress crack of medium carbon alloy cold heading steel hot rolled blank |
| CN114918250A (en) * | 2022-05-21 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | Production method for reducing aging time of high-carbon wire rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064845A (en) * | 1999-12-20 | 2001-07-11 | 이구택 | A method for manufacturing steel material for cold forging with low property deviation |
| CN102560253A (en) * | 2012-03-13 | 2012-07-11 | 南京钢铁股份有限公司 | Manufacturing method of high-quality cold heading steel with uniform structure property |
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103805847A (en) * | 2014-03-07 | 2014-05-21 | 武钢集团昆明钢铁股份有限公司 | Optical round wire rod reinforcement bar for producing prestressed concrete steel rod and processing method |
| CN103938071A (en) * | 2014-04-30 | 2014-07-23 | 武汉钢铁(集团)公司 | Wire for stranded galvanized steel wire and production method of wire |
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2015
- 2015-04-10 CN CN201510168693.XA patent/CN104745790B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064845A (en) * | 1999-12-20 | 2001-07-11 | 이구택 | A method for manufacturing steel material for cold forging with low property deviation |
| CN102560253A (en) * | 2012-03-13 | 2012-07-11 | 南京钢铁股份有限公司 | Manufacturing method of high-quality cold heading steel with uniform structure property |
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103805847A (en) * | 2014-03-07 | 2014-05-21 | 武钢集团昆明钢铁股份有限公司 | Optical round wire rod reinforcement bar for producing prestressed concrete steel rod and processing method |
| CN103938071A (en) * | 2014-04-30 | 2014-07-23 | 武汉钢铁(集团)公司 | Wire for stranded galvanized steel wire and production method of wire |
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