CN109735773A - A kind of high-carbon steel pearlite lamella interval controlling method - Google Patents
A kind of high-carbon steel pearlite lamella interval controlling method Download PDFInfo
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- CN109735773A CN109735773A CN201811629438.0A CN201811629438A CN109735773A CN 109735773 A CN109735773 A CN 109735773A CN 201811629438 A CN201811629438 A CN 201811629438A CN 109735773 A CN109735773 A CN 109735773A
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Abstract
A kind of high-carbon steel pearlite lamella interval controlling method, belongs to high-carbon steel technical field.Technique includes: industrial molten iron, steel scrap → 100 ton converter smelting → LF furnace refining → 160 square billets of continuous casting → slab heating → roughing → in roll and → wear water (secondary control is cold) → finish rolling (controlled rolling) → and wear water (two secondary controls are cold) → spinning → air-cooled (three secondary controls are cold) → collection volume → PF line transport → bundling → packed and transported.By Cr microalloying and control phase transformation combined technology, high-carbon steel is allowed sorbite transformation to occur in phase transformation rather than perlitic transformation, the Cr content range in steel: 0.21-0.26%, target: 0.23%；Roughing temperature: 950-1050 DEG C, 860-920 DEG C of coolant-temperature gage is worn in advance out；830-890 DEG C of laying temperature, steyr control cold line roller table speed and blower are opened after spinning.The advantage is that successfully solving under the premise of blower air-cooled scarce capacity by Cr microalloying and control phase transformation combined technology, high-carbon steel how to be allowed sorbite transformation to occur in phase transformation rather than perlitic transformation.
Description
Technical field
The invention belongs to high-carbon steel technical fields, in particular, provide a kind of high-carbon steel pearlite piece interlamellar spacing controlling party
Method controls the control of pearlite piece interlamellar spacing using the microalloying of Cr element in high-carbon steel.
Background technique
High carbon wire rod wire rod, such as 70, No. 80 rigid lines, 72A, 82A steel cord steel, 72B, 77B, 82B compressor wire steel
Twisted wire steel, under conditions of without any heat treatment, directly progress cold drawing, drawing deformation amount is up to for Downstream processing enterprise
80-90%.In order to reduce the wire broken rate in drawing process, to the gas of original wire rod, degree of purity, it is mingled with, surface quality, remnants
The qualities in kind such as element, P, S content, metallographic structure, mechanical property, metallographic structure have very high requirement.Wherein metallographic structure is wanted
It asks as sorbite, there is not allowed that low temperature martensitic body tissue and influencing the center portion desmachyme that user uses.
Tissue more transition temperature after high-carbon steel austenite phase transformation has a direct relationship, lamellar pearlite refer to A1~
It is formed in 650 DEG C of temperature ranges, can obviously tell ferrite and cementite lamella lamellar structure form under an optical microscope
Pearlite, piece spacing is about 150~450nm.The pearlite formed in 650~600 DEG C of temperature ranges, piece spacing
It is smaller, about 80~150nm, referred to as sorbite；The pearlite formed in 600~550 DEG C of temperature ranges, piece spacing pole
Carefully, about 30~80nm, referred to as troostite (or troostite).For 80#, the hard wire steels such as 77B, 82B, user is without overheat
Just direct drawing is handled, the deflection that drawing generates is 80% or more, in order to meet the processing technology of user, it is desirable that wire rod hot rolling
The metallographic structure of material is sorbite, and ratio should be controlled 80% or more.
After ingredient is fixed, the direct factor for influencing high-carbon steel metallographic structure is cooling velocity in wire rod phase transition process.
After most high-speed wire factory roll both at home and abroad at present all in such a way that stelmor carries out control cooling, air-cooled line upper fan
Every 4.5m arranges one, and single fan delivery is usually 15.4 × 104m3/h.When production producing line after the installation is completed, the maximum of blower
Air-cooled ability just finally is defined.For example when rolling the 82B wire rod of Φ 12.5mm specification, maximum cooling rate is in 7.0m/
S, under the conditions of such cooling rate, the normal tissue of wire rod is sorbite, and piece interlamellar spacing is substantially at 0.2 μm.But it is big in production specification
When the wire rod of Φ 12.5mm specification, control cold energy power is obviously insufficient, and tissue is mostly pearlite, is not able to satisfy sorbite rate and reaches
80% or more requirement.
The present invention by Cr microalloying and control phase transformation combined technology, successfully solve the air-cooled ability of blower not
Under the premise of foot, high-carbon steel how to be allowed sorbite transformation to occur in phase transformation rather than perlitic transformation.
Summary of the invention
The purpose of the present invention is to provide a kind of high-carbon steel pearlite lamella interval controlling method, by Cr microalloying with
Phase transformation combined technology is controlled, successfully solves under the premise of blower air-cooled scarce capacity, how to allow high-carbon steel in phase transformation
Shi Fasheng sorbite changes rather than perlitic transformation.
Technique of the invention includes: industrial molten iron, steel scrap → 100 ton converter smelting → LF furnace refining → 160 square billet of continuous casting
→ slab heating → roughing → in roll and → wear water (secondary control is cold) → finish rolling (controlled rolling) → and wear water (two secondary controls are cold) → spinning → wind
Cold (three secondary controls are cold) → collect volume → PF line transport → bundling → packed and transported, the technical parameter controlled in technique is as follows:
(1) by Cr microalloying and control phase transformation combined technology, allow high-carbon steel that sorbite transformation occurs in phase transformation
Rather than perlitic transformation, the Cr content range in steel: 0.21-0.26%, target: 0.23%.
(2) roughing temperature: 950-1050 DEG C, 860-920 DEG C of coolant-temperature gage is worn in advance out；830-890 DEG C of laying temperature, spinning
Steyr control cold line roller table speed and blower unlatching are controlled by table 1-2 afterwards:
Table 1 rolls the mining KY82B steel strand wires roller table speed control of 14.0 specification of Φ
| Specification | 1 | 2 | 3 | 4 | 5 | 6 | 7-8 | 9-10 | 11-13 | 14-15 | Remaining |
| Φ14.0 | 30 | 0 | 10 | 20 | 35 | 45 | 55 | 45 | 40 | 35 | 30 |
The mining KY82B steel strand wires blower opening ways of rolling 14.0 specification of Φ of table 2
The present invention is middle carbide by being Cr using Cr, can postpone the forming core of carbide and grow up, also
The binding force that can increase between solid solution atom reduces the self-diffusion coefficient of iron, changes to postpone γ → α in perlitic transformation.
It is shown by thermal modeling test, on the basis of normal normal effect steel 80#, Cr is added, becomes by this ingredient
After change, within the scope of 1-16 DEG C/s of cooling rate, phase transformation variation tendency is: under identical cooling rate, phase transformation starting point and end point to
Low temperature is mobile, and cooling velocity is bigger, and the difference mobile to low temperature is bigger.After 4 DEG C/s of cooling rate, just there is middle low-temperature transformation group
It knits, the 80# steel without adding Cr element is still pearlitic structrure in 16 DEG C/s.Specific cooling curve is as shown in Figure 1.
Using such characteristic of Cr element, can be added different according to the difference of scene control cold line blower cooling capacity
Cr content can reach the requirement of designer oneself after phase transformation.
Detailed description of the invention
Fig. 1 is containing 0.37%Cr and the influence diagram without Cr to C curve.
Fig. 2 is original process wire rod edging tissue figure.
Fig. 3 is original process wire rod core organization chart.
Fig. 4 is wire rod edging tissue figure after process modification.
Fig. 5 is wire rod edging tissue figure after process modification.
Specific embodiment
The present invention can be implemented in any high-speed rod workshop: be Shoudu Iron and Steel Co Shui Gang Co., Ltd below using present invention production
The example of KY82B, process route are as follows:
Industrial molten iron, steel scrap → 90 ton converter smelting → LF furnace refining → 160 square billets of continuous casting → slab heating → roughing →
In roll → wear water (secondary control is cold) → finish rolling (controlled rolling) → and wear water (two secondary controls are cold) → spinning → air-cooled (three secondary controls are cold) → collection volume
→ PF line transport → bundling → packed and transported
Embodiment:
Table 3, wire rod organizational controls composition range
| Project | C, % | Si, % | Mn, % | P, % | S, % | Cr, % |
| Range | 0.78-0.82 | 0.17-0.35 | 0.6-0.9 | ≤0.025 | ≤0.025 | 0.21-0.26 |
| Target | 0.79 | 0.21 | 0.81 | 0.017 | 0.008 | 0.23 |
Such component system is the ingredient for producing the common 82B of Φ 12.5mm specification, and the tissue sorbite rate of production is 85%
More than, and sorbite piece interlamellar spacing is at 0.2 μm.Major Gao Xian factory can produce current such mode at home.
This test when, directly with change component system roll the common KY82B of Φ 14mm specification.After specification increase, control cold
The air quantity of line upper fan is opened also according to maximum air-cooled ability, simultaneously because specification increases, when produced on-site is obviously air-cooled
Blower is opened 2 Fans by scarce capacity more.
Using the KY82B wire rod sorbite rate of technique production in 60-65%, hoc scenario is shown in Fig. 2, Fig. 3.
It can be seen that the ingredient using production Φ 12.5mm specification 82B from Fig. 2, Fig. 3, Direct Rolling Φ 14mm specification
Wire rod, when fan capacity opens maximum, for the sorbite rate of wire rod in 60-65%, wire rod core set is woven to coarse pearlite
Tissue, piece interlamellar spacing are 0.36 μm.
The situation that later period combines producing line air-cooled is added to more on the basis of producing the ingredient of Φ 12.5mm specification 82B
0.04% Cr, practical smelting ingredient are as shown in the table.
4 KY82B wire rod Composition Control range of table
| Project | C, % | Si, % | Mn, % | P, % | S, % | Cr, % |
| Range | 0.78-0.82 | 0.17-0.35 | 0.6-0.9 | ≤0.025 | ≤0.025 | 0.24-0.29 |
| Internal control | 0.81 | 0.22 | 0.82 | 0.015 | 0.007 | 0.27 |
- start rolling temperature is controlled at 1050~1100 DEG C, in favor of the soldering of shrinkage cavity.
- lead to the precipitation strength technology of V using heat preservation after phase transformation, improve wire rod it is offline after tensile strength.
- steel billet is come out of the stove laggard horizontal high voltage water dephosphorization, is rolled after dephosphorization is complete, rolling mill practice is performed as follows:
- roughing temperature: 950-1050 DEG C；
Wear 860-920 DEG C of coolant-temperature gage in advance out；
Laying temperature is controlled at 830-890 DEG C；
Steyr control cold line roller table speed and blower unlatching are controlled by table 1-2 control parameter after spinning:
Table 1 rolls the mining steel strand wires roller table speed control of Φ 14.0mm specification
| Specification, mm | 1 | 2 | 3 | 4 | 5 | 6 | 7-8 | 9-10 | 11-13 | 14-15 | Remaining |
| Φ14.0 | 30 | 0 | 10 | 20 | 35 | 45 | 55 | 45 | 40 | 35 | 30 |
The mining steel strand wires blower opening ways of the rolling Φ 14.0mm specification of table 2
The opening ways of air-cooled line upper fan are as before.After such Cr microalloying, the metallographic group of wire rod
It knits as shown in Figure 4, Figure 5.80% or more wire rod entirety sorbite rate, wire rod edge metallographic structure such as Fig. 4, center portion metallographic structure are such as
Fig. 5.
It can be seen that from Fig. 4, Fig. 5 and be added to by the basis of the ingredient of production production Φ 12.5mm specification 82B morely
0.04% Cr, in Rolling Production Φ 14mm specification KY82B wire rod, core completes sorbite transformation, the control of piece interlamellar spacing
At 0.22 μm.
By effective combination of such Cr microalloy and the different production air-cooled abilities of producing line, successfully opened in Shoudu Iron and Steel Co water steel producing line
The KY82B wire rod of mining big specification steel strand wires Φ 14mm specification is had issued, monthly output reaches 1000 tons.
Claims (1)
1. a kind of high-carbon steel pearlite lamella interval controlling method, technique includes: industrial molten iron, steel scrap → 100 ton converter smelting
→ LF furnace refining → 160 square billets of continuous casting → slab heating → roughing → in roll and → wear water (secondary control is cold) → finish rolling (controlled rolling) → to wear
Water (two secondary controls are cold) → spinning → air-cooled (three secondary controls are cold) → collection volume → PF line transport → bundling → packed and transported, feature exist
In the technical parameter controlled in technique is as follows:
(1) it is combined by Cr microalloying with control phase transformation, high-carbon steel is allowed sorbite transformation to occur in phase transformation rather than pearly-lustre
Body changes, the Cr content range in steel: 0.21-0.26%, target: 0.23%
(2) roughing temperature: 950-1050 DEG C, 860-920 DEG C of coolant-temperature gage is worn in advance out；830-890 DEG C of laying temperature,
Steyr control cold line roller table speed and blower are opened after spinning: roller-way 1:30m/min；Roller-way 2:0m/min；Roller-way 3:
10m/min；Roller-way 4:20m/min；Roller-way 5:35m/min；Roller-way 6:45m/min；Roller-way 7-8:55m/min；Roller-way 11-13:
40m/min；Roller-way 14-15:35m/min；Remaining roller-way: 30m/min；
Blower open degree: it 1-4 blower: opens；Frequency: 50Hz；5 blowers: it opens；Frequency: 50Hz；6 blowers: it opens；Frequency: 45Hz；7 wind
Machine: it opens；Frequency: 50Hz；8 blowers: it opens；Frequency: 50Hz；9-12 blower: it opens；Frequency: maximum parameter i.e. 100%；Remaining blower:
It closes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080618A (en) * | 2020-09-25 | 2020-12-15 | 攀钢集团研究院有限公司 | Control method of 82B hot-rolled wire rod core martensite and grain boundary cementite |
| CN115710621A (en) * | 2022-10-23 | 2023-02-24 | 东北大学秦皇岛分校 | Process method for reducing graphitization of carbon steel |
| WO2023056658A1 (en) * | 2021-10-08 | 2023-04-13 | 江阴兴澄合金材料有限公司 | Cord steel wire rod suitable for deep drawing and manufacturing method therefor |
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| JP2008261028A (en) * | 2007-04-13 | 2008-10-30 | Nippon Steel Corp | High-carbon steel wire rod having excellent wire drawability |
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| EP2083094A1 (en) * | 2006-10-12 | 2009-07-29 | Nippon Steel Corporation | High-strength steel wire excelling in ductility and process for producing the same |
| CN101597676A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference |
| CN105624564A (en) * | 2016-01-05 | 2016-06-01 | 江阴兴澄特种钢铁有限公司 | High-carbon steel wire with good fine steel cord drawing machining performance and manufacturing method of high-carbon steel wire |
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Patent Citations (5)
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| EP2083094A1 (en) * | 2006-10-12 | 2009-07-29 | Nippon Steel Corporation | High-strength steel wire excelling in ductility and process for producing the same |
| JP2008261028A (en) * | 2007-04-13 | 2008-10-30 | Nippon Steel Corp | High-carbon steel wire rod having excellent wire drawability |
| CN101392313A (en) * | 2008-11-04 | 2009-03-25 | 首钢总公司 | Method for shortening high carbon steel aging time through online thermal insulation |
| CN101597676A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference |
| CN105624564A (en) * | 2016-01-05 | 2016-06-01 | 江阴兴澄特种钢铁有限公司 | High-carbon steel wire with good fine steel cord drawing machining performance and manufacturing method of high-carbon steel wire |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080618A (en) * | 2020-09-25 | 2020-12-15 | 攀钢集团研究院有限公司 | Control method of 82B hot-rolled wire rod core martensite and grain boundary cementite |
| CN112080618B (en) * | 2020-09-25 | 2022-05-24 | 攀钢集团研究院有限公司 | Control method of 82B hot-rolled wire rod core martensite and grain boundary cementite |
| WO2023056658A1 (en) * | 2021-10-08 | 2023-04-13 | 江阴兴澄合金材料有限公司 | Cord steel wire rod suitable for deep drawing and manufacturing method therefor |
| CN115710621A (en) * | 2022-10-23 | 2023-02-24 | 东北大学秦皇岛分校 | Process method for reducing graphitization of carbon steel |
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Application publication date: 20190510 |