CN101597676A - A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference - Google Patents
A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference Download PDFInfo
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- CN101597676A CN101597676A CNA200910088147XA CN200910088147A CN101597676A CN 101597676 A CN101597676 A CN 101597676A CN A200910088147X A CNA200910088147X A CN A200910088147XA CN 200910088147 A CN200910088147 A CN 200910088147A CN 101597676 A CN101597676 A CN 101597676A
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Abstract
A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference belongs to the high carbon steel technical field.Utilize chromium can reduce the phase transformation of 82B steel and begin characteristics with end temp, the Cr that add 0.04%-0.06% on the basis of 82B composition of steel more, the 4-6 rice position of wire rod before phase transformation is adjusted into 85% to the phase transformation starting point with the unlatching of blower fan, from the phase transformation position to wire rod 490-510 ℃ position, blower fan is all opened, with the rear fan Close All, up to the collection coil packing.Advantage is, solves the 82B wire rod sorbite rate problem on the low side of producing Φ 15-16mm specification by the stelmor cooling control technology.
Description
Technical field
The invention belongs to the high carbon steel technical field, a kind of method that solves big specification 82B wire rod heart portion and edging tissue difference particularly is provided.Utilize the Cr element can reduce the characteristics of 82B wire rod transformation temperature, on the basis of 82B composition, increase proper C r, before phase transformation, reduce speed of cooling, the control phase transformation, wire rod core of producing and limit portion all are the sorbite tissue.
Background technology
82B belongs to the high-carbon wire rod of deep processing, wire rod is under heat treated condition, require directly to pull to Φ 5mm from Φ 12.5mm, the reducing rate that drawing produces is up to the 85%[remarks: the original area of reducing rate=(area after wire rod original area-drawing)/wire rod].The fracture of wire not in order to satisfy so big distortion, wire rod not only requires to have high purity, favorable surface quality, and requires the sorbite rate of wire rod to be controlled at more than 80%, must require the core of wire rod and edging tissue uniformity as much as possible.For the 82B wire rod of producing small dimension (diameter≤Φ 12.5mm), adopt the stelmor cooling control technology can reach requirement; For the big specification 82B wire rod of diameter more than Φ 13mm specification, the 82B of Φ 15-16mm specification particularly, only depend on the stelmor mode to carry out controlled chilling, cause the problem of following two aspects easily: (1) fan capacity is little (during speed of cooling＜9 ℃/S), wire rod can not carry out sorbitizing fully, the wire rod of producing often limit portion is the sorbite tissue, and core but is thick pearlitic structure, and the whole sorbite rate of wire rod is less than 70%; (speed of cooling＞10 ℃/S when (2) fan capacity is big, but present stelmor control cold line is when producing the 82B of Φ 15-16mm specification, cooling power all 9 ℃/below the S), though wire rod can carry out sorbitizing completely, but because wire rod limit portion cooling power is too big, so limit portion often occur for troostite even martensite waited cold tissue, core can reach sorbitizing completely.Japan Nippon Steel adopts rolls the way that the back salt bath is handled, and the 82B wire rod core and the edging tissue of the Φ 14-16mm specification of production all are the sorbite tissue, and the sorbite rate can be controlled at more than 85%.And adopt the 82B wire rod sorbite rate of the Φ 14-16mm specification of stelmor cooling control technology production all to be lower than 75% at present both at home and abroad.
Summary of the invention
The purpose of this invention is to provide a kind of method that solves big specification 82B wire rod heart portion and edging tissue difference, combining with the control phase transformation by microalloying solves big specification 82B wire rod core and edging tissue difference, solves the 82B wire rod sorbite rate problem on the low side of production Φ 15-16mm specification by the stelmor cooling control technology.
The present invention utilizes chromium can reduce the phase transformation of 82B steel to begin characteristics with end temp, the Cr that add 0.04%-0.06% on the basis of 82B composition of steel more, the 4-6 rice position of wire rod before phase transformation is adjusted into 85% to the phase transformation starting point with the unlatching of blower fan, from the phase transformation position to wire rod 490-510 ℃ position, blower fan is all opened, with the rear fan Close All, up to the collection coil packing.
Main contents of the present invention comprise the following aspects:
1, Cr can reduce starting point and the end point of 82B austenite to the sorbite transition temperature:
Cr is middle strong carbide forming element, and the forming core of deferrable carbide and growing up can also increase the interatomic bonding force of sosoloid and reduce the self-diffusion coefficient of iron, changes thereby postponed γ in the perlitic transformation → α.Because this two aspect makes whole P transition process slow.
In order to inquire into the influence of chemical ingredients, carried out thermal modeling test to phase transformation and structure property.Testing installation is Gleeble2000.Adopt the long sample of φ 12.5 * 180mm, be heated to 1000 ℃, be incubated 10 minutes.Be as cold as 830 ℃ soon.By regulating air quantity, make it be controlled to be 7 ℃/s (for on-the-spot actual measurement speed of cooling) and 10 ℃/s (after increasing cooling rate) from 830 ℃ of speed of cooling to lower-most point, inquire into the influence of different chemical composition to each phase temperature of phase transformation.
(1) test chemical ingredients
Test is as shown in table 1 with the chemical ingredients of steel.
Table 1 test steel chemical composition
| Numbering | Lot number | C，％ | Si，％ | Mn，％ | Cr，％ |
| |
7-1789 | 0.82 | 0.26 | 0.69 | - |
| |
4-186 | 0.81 | 0.19 | 0.79 | 0.37 |
Annotate: sample 1 is 80
#Steel, sample 2 is the composition that adds the 82B of 0.37%Cr.
(2) mensuration of CCT curve
Measure austenite → the perlitic transformation curve as shown in Figure 1.
Compare with sample 1, the composition characteristic of sample 2 is: the carbon appropriateness reduces, add Cr, after this composition variation, in cooling rate 1-16 ℃/s scope, the phase transformation variation tendency is: under identical cooling rate, phase transformation starting point and end point move to low temperature, speed of cooling is big more, and the difference that moves to low temperature is big more.4 ℃ of cooling rates/below the s, middle low-temperature transformation tissue has just been arranged, and sample 1 remains pearlitic structure when 16 ℃/s.This shows that Cr has a significant impact transformation temperature and structural transformation.
2, utilize the perviousness of Cr to avoid the appearance of big specification 82B wire rod core pearlitic structure
The at present domestic stelmor control cold line fan delivery that is used to produce the 82B wire rod mostly is 152400m
3/ h and 180000m
3/ h, speed of cooling is roughly at 7 ℃/S when producing the 82B of Φ 15mm specification, and the minimum temperature of wire rod phase transformation is at 640 ℃ on air-cooled line, and top temperature is at 690 ℃, and wire rod sorbite rate integral body is about 70%, and limit portion is a sorbite, and core is a pearlitic structure.The present invention utilizes the perviousness of Cr at high carbon steel, the Cr that increase 0.04-0.06% on the basis of 82B composition more, the vertex of wire rod transformation temperature is reduced to 860 ℃, and what make that the wire rod core takes place in phase transition process is that sorbite changes, and has avoided the appearance of the thick lamella pearlitic structure of core;
3, avoid limit portion cooling rate too fast by the cooling rate before the reduction phase transformation
The wire rod overall permeability has obtained reinforcement after adding Cr, and troostitic structures have appearred in limit portion, the air quantity of a blower fan before the wire rod phase transformation is reduced to original 85%, has reduced the speed of cooling of wire rod limit portion, has avoided the appearance of troostitic structures;
Description of drawings
Fig. 1 is the CCT curve.
Fig. 2 is experiment metallograph (edging tissue).
Fig. 3 is experiment metallograph (core tissue).
Fig. 4 is for adding metallographic structure (edging tissue) behind the Cr.
Fig. 5 is for adding metallographic structure (core tissue) behind the Cr.
Fig. 6 closes back metallograph, limit portion sorbite (0.13 ц m) for microalloy and control cold junction.
Fig. 7 closes back metallograph, core sorbite (0.21 ц m) for microalloy and control cold junction.
Embodiment
The present invention can implement in any high-speed rod workshop: below be Shoudu Iron and Steel Co first wire rolling plants, adopt the present invention to produce the example of 82B-1SG, its operational path is
Strand heating-roughing-in roll-wear water (secondary control is cold)-finish rolling (controlled rolling)-wear water (two secondary controls are cold)-weave silk-air-cooled (three secondary controls are cold)-collection volume-PF line transportation-bundling-packed and transported
The condition of production when one, not using this method:
Big specification (Φ 14-16mm) 82B wire rod is starting material of making Φ 18.9-21.6mm gauge steel twisted wire, wire rod is under heat treated condition, need directly to pull to about Φ 6mm, require the metallographic structure of wire rod to be organized as the master with sorbite from Φ 14-16mm.In September, 2008, Shoudu Iron and Steel Co was tested the 82B of 2 stove Φ 15mm specifications, and the experiment composition sees Table 2:
Table 2: experimental steel composition
| Project | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| Scope | 0.78-0.82 | 0.17-0.35 | 0.6-0.9 | ≤0.025 | ≤0.025 | 0.21-0.26 |
| |
0.79 | 0.21 | 0.81 | 0.017 | 0.008 | 0.23 |
| |
0.80 | 0.23 | 0.83 | 0.013 | 0.010 | 0.25 |
Post-rolling control cooling process sees Table 3:
Table 3: cooling control technology
The 82B wire rod sorbite rate that adopts this explained hereafter organizes situation to see Fig. 2, Fig. 3 at 60-65%.
Edging tissue is the average sheet interlayer spacing 0.13 μ m of sorbite, and core is thick perlite, and average sheet interlayer spacing is organized extremely inhomogeneous at 0.57 μ m.
The 82B-1 wire rod is starting material of making the 1860MPa steel strand, the reducing rate of user in drawing process is up to 85%, in order to guarantee in the drawing process not fracture of wire, the user when use except require to be mingled with, the indexs such as metallographic structure, surface quality, the sorbite rate of wire rod requires more than 80% in use.The big specification 82B sorbite rate that this time experiment is produced is about 65%, and core is that perlite, the limit portion of thick lamella is the sorbite tissue, can not reach the requirement of big specification 82B.
Two, add situation behind the Cr
Because Cr is middle strong carbide forming element, the forming core of deferrable carbide and growing up can also increase the interatomic bonding force of sosoloid and reduce the self-diffusion coefficient of iron, changes thereby postponed γ in the perlitic transformation → α.In November, 2008, on the basis of experiment for the first time, added 0.04% Cr more, the experiment composition sees Table 4:
Table 4: add Cr experiment composition
| Project | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| Scope | 0.78-0.82 | 0.17-0.35 | 0.6-0.9 | ≤0.025 | ≤0.025 | 0.25-0.30 |
| The experimental steel composition | 0.80 | 0.23 | 0.82 | 0.015 | 0.006 | 0.28 |
The cooling control technology after rolling and the first time the same (seeing Table 3).
The sorbite rate of wire rod is about 85%, and Fig. 4, Fig. 5 are seen in metallographic structure.
Edging tissue is sorbite+troostite, and core is the sorbite tissue, sheet interlayer spacing average out to 0.18 ц m.Add and solved the big core of specification behind the Cr and can not carry out the sorbitizing problem fully, cross cold tissue but troostite has appearred in limit portion
Three, adding Cr combines with controlled chilling
Troostite occurred and cross cold tissue owing to add behind the Cr limit portion of wire rod, when testing for the third time, seminar has reduced 20% with the air quantity of a blower fan of phase transformation starting position, and air-cooled technology sees the following form 5:
Table 5: the 3rd experimental technique
The whole sorbite rate of wire rod is more than 80%, metallographic structure such as Fig. 6, Fig. 7
Fig. 6: microalloy closes back metallograph, limit portion sorbite (0.13 ц m) with the control cold junction;
Fig. 7: microalloy closes back metallograph core sorbite (0.21 ц m) with the control cold junction
By on the basis of 82B, adding Cr, solved big specification 82B wire rod core sorbitizing problem fully, the blower fan cooling rate during by the adjustment phase transformation has been avoided the appearance of limit portion low temperature tissue.Shoudu Iron and Steel Co is successfully produced the 82B-1SG of Φ 14-16mm specification at present by this technology, and monthly output is stabilized in more than 1000 tons.Table 6 is a collection of 82B-1SG situations of Shoudu Iron and Steel Co in April, 2009 production:
Table 6:09 Shoudu Iron and Steel Co in April is produced Φ 15mm specification 82B-1SG user situation
Claims (1)
1, a kind of method that solves big specification 82B wire rod heart portion and edging tissue difference, it is characterized in that, utilize chromium can reduce the phase transformation of 82B steel and begin characteristics with end temp, the Cr that add 0.04%-0.06% on the basis of 82B composition of steel more, the 4-6 rice position of wire rod before phase transformation is adjusted into 85% to the phase transformation starting point with the unlatching of blower fan, and to wire rod 490-510 ℃ position, blower fan is all opened from the phase transformation position, with the rear fan Close All, up to the collection coil packing.
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|---|---|---|---|
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|---|---|---|---|
| CN200910088147XA CN101597676B (en) | 2009-07-03 | 2009-07-03 | Method for solving differences between the center of larger-size 82B wire rod and the edging tissue thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162025A (en) * | 2011-03-28 | 2011-08-24 | 首钢总公司 | Method for reducing center martensitic structure of high-carbon steel coil rod |
| CN108396239A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | A kind of high-carbon steel wire rod and its production method for fine drawing |
| CN109735773A (en) * | 2018-12-28 | 2019-05-10 | 首钢集团有限公司 | A kind of high-carbon steel pearlite lamella interval controlling method |
| CN111020107A (en) * | 2019-12-17 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Method for controlling carbon segregation of high-carbon steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355925C (en) * | 2004-11-17 | 2007-12-19 | 首钢总公司 | Micro-alloying production for 82B wire rod of steel strand |
-
2009
- 2009-07-03 CN CN200910088147XA patent/CN101597676B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162025A (en) * | 2011-03-28 | 2011-08-24 | 首钢总公司 | Method for reducing center martensitic structure of high-carbon steel coil rod |
| CN102162025B (en) * | 2011-03-28 | 2012-09-05 | 首钢总公司 | Method for reducing center martensitic structure of high-carbon steel coil rod |
| CN108396239A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | A kind of high-carbon steel wire rod and its production method for fine drawing |
| CN109735773A (en) * | 2018-12-28 | 2019-05-10 | 首钢集团有限公司 | A kind of high-carbon steel pearlite lamella interval controlling method |
| CN111020107A (en) * | 2019-12-17 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Method for controlling carbon segregation of high-carbon steel |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |