CN107321787B - Low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method - Google Patents
Low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method Download PDFInfo
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- CN107321787B CN107321787B CN201710386569.XA CN201710386569A CN107321787B CN 107321787 B CN107321787 B CN 107321787B CN 201710386569 A CN201710386569 A CN 201710386569A CN 107321787 B CN107321787 B CN 107321787B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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Abstract
The invention discloses a kind of low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control methods, comprising: final rolling temperature control, mill inlet temperature control within the scope of 830~870 DEG C, and finishing stands temperature rise controls within the scope of 30~60 DEG C；Laying temperature control, laying temperature control within the scope of 810~850 DEG C；Cooling velocity control controls wire rod into insulation cover temperature within the scope of 740~760 DEG C, and insulation cover temperature is within the scope of 590~670 DEG C out.The present invention can obtain that FeO content ratio is lower, iron scale of thinner thickness, occur the speed of surface red rust so as to improve low-alloy cold-forging steel.
Description
Technical field
The present invention relates to a kind of smelting and rolling mill practices, specifically, it is rotten to be related to a kind of resistance to atmosphere of low-alloy the cold heading steel
Lose surface iron scale control method.
Background technique
Raising with user to hot rolling wire performance requirements, user start to wire surface quality, service performance
And more stringent requirements are proposed for corrosion resistance, especially to the higher steel products of the surface quality requirements of hot rolling wire,
Such as requirement of fastener cold-forging steel, welding steel, prestress wire steel to hot rolling wire surface quality is all more severe
It carves.Premature generation red rust in transportational process, will increase the postorder cost of user, influences wire rod exterior appearance.
The scale structure of hot-rolled steel has vital influence to the surface quality of steel, is to prevent corrosion of steel
Primary barrier.Iron scale is the oxide for the iron that steel surface generates under high temperature, and constituting includes FeO, Fe2O3And Fe3O4,
FeO, Fe are followed successively by from steel matrix to surface3O4And Fe2O3.The color of iron scale is with oxidation component each in iron scale
It constitutes and changes, work as Fe2O3When ratio is higher, red is shown as；When FeO is more, pewter is shown as；Fe3O4When occupying the majority,
In black.By controlling the adjustment of cold technique to the control of low-alloy the cold heading steel, obtain the different iron scale component in surface and
Thickness can effectively improve low-alloy cold-forging steel atmospheric corrosion resistance.
Summary of the invention
Technical problem solved by the invention is to provide a kind of low-alloy the cold heading steel atmospheric corrosion resistance surface oxidation iron
Skin control method, can obtain that FeO content ratio is lower, iron scale of thinner thickness, go out so as to improve low-alloy cold-forging steel
The speed of existing surface red rust.
Technical solution is as follows:
A kind of low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method, comprising:
Final rolling temperature control；Mill inlet temperature controls within the scope of 830~870 DEG C, and finishing stands temperature rise control exists
Within the scope of 30~60 DEG C；
Laying temperature control；Laying temperature controls within the scope of 810~850 DEG C；
Cooling velocity control；Wire rod is controlled into insulation cover temperature within the scope of 740~760 DEG C, insulation cover temperature is 590 out
Within the scope of~670 DEG C.
Further, in cooling velocity control process, by opening the 1st~2 insulation cover, by first blower open degree control
It is made as 50%, realizes that wire rod within the scope of 740~760 DEG C, controls wire rod in the stop of high-temperature oxydation section into insulation cover temperature
Between；3~20 insulation covers are closed, 2~10 frame blowers are closed, control roller table speed controls wire rod and go out to keep the temperature in 0.1~0.5m/s
Cover temperature is within the scope of 590~670 DEG C.
Further, the chemical component mass percentage composition of low-alloy cold-forging steel includes C:0.33~0.37%, Si:0.10
~0.20%, Mn:0.62~0.72%, Cr:0.82~0.92%, Mo:0.16~0.25%, and including Cr, Ni, Cu alloy member
Element.
Further, the content of FeO is lower than 35%, Fe in the iron scale of low-alloy the cold heading steel3O4Content is higher than
45%, thickness is lower than 35 μm.
Further, the iron scale of gren rod, with a thickness of 5 μm, Fe3O4 content ratio is 68% in iron scale.
Compared with prior art, the technology of the present invention effect includes:
It is suitable to obtain thickness by the adjustment to medium carbon cold heading steel laying temperature and Stelmor controlled cooling line technique by the present invention
In, Fe3O4The higher iron scale of content ratio, while passing through the surface quality and cold heading performance for controlling and can optimizing wire rod.
Raising with user to hot rolling wire wire rod quality requirement, the present invention improve wire rod surface matter by research
Amount while improving the market competitiveness, increases user to the confidence of Baogang's product.Therefore increase by 40 yuan/ton of wire rod selling price,
If 20,000 tons of wire rod of sale every year, is increased by 800,000 yuan of benefit.
Detailed description of the invention
Fig. 1 is using low-alloy cold-forging steel ML35CrMo gren rod iron scale thickness microgram before the present invention；
Fig. 2 is using iron scale thickness microgram after low-alloy upsetting steel ML35CrMo gren rod control after the present invention；
Fig. 3 is using present invention front and back low-alloy upsetting steel ML35CrMo gren rod X-ray diffraction component analysis figure.
Specific embodiment
It elaborates below with reference to example embodiment to technical solution of the present invention.However, example embodiment can
Implement in a variety of forms, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that
The design of example embodiment more comprehensively and completely, and is comprehensively communicated to those skilled in the art by the present invention.
The purpose of control final rolling temperature is control scale structure and overall thickness.According to low-alloy cold-forging steel air atmosphere
Continuous oxidation behavior curve, avoids the quick oxidation section of iron scale, and lower final rolling temperature can make Alloy Cold Heading Steel wire rod
Thickness of scale on surface is relatively thin, and FeO content is lower in control iron scale constituent, Fe3O4Content is higher, transport
Iron scale is not easily to fall off in the process, can play a protective role to wire rod surface, prevents wire rod surface from generating red rust, influences disk
Appearance.Laying temperature control equally will affect scale structure and overall thickness, the oxygen that lower laying temperature generates
It is relatively thin to change thickness of scale, but wire rod surface is easy to appear red rust, influences wire rod appearance, so laying temperature cannot be too low.Compared with
The iron scale thickness that high laying temperature generates is thicker, and the FeO layer of wire rod internal layer is thicker, is easy to appear layering bubbling etc. and lacks
It falls into, is easy to fall off in transportational process, protective effect is not had to wire rod surface.
The present invention is on the basis of in-depth analysis low-alloy the cold heading steel iron scale oxide forms rule, to heat
The technological parameter that each process procedure of the cold process of wire rod controlled rolling control proposes quantified controlling is rolled, it is cold to optimize current wire rod operation area low-alloy
Upsetting steel wire rod production technology.
Low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method is suitable for wire rod operation area production work
Skill parameter is optimized and revised, comprising:
1, final rolling temperature controls；
Mill inlet temperature controls within the scope of 830~870 DEG C, and finishing stands temperature rise is controlled in 30~60 DEG C of ranges
It is interior；
2, laying temperature controls；
Laying temperature controls within the scope of 810~850 DEG C.
In the present invention, control laying temperature and stelmor cooling technique are keys, and control laying temperature mainly adjusts
The constituent for optimizing iron scale is controlled laying temperature in 810~850 DEG C of models by adjusting 5# water volume in water tank after finish rolling
In enclosing, keep FeO content ratio in iron scale lower.
3, cooling velocity controls.
It adjusts Stanermo wind-cooling linear insulation cover and opens quantity and blower open degree, control wire rod exists into insulation cover temperature
Within the scope of 740~760 DEG C, insulation cover temperature is within the scope of 590~670 DEG C out.
It is 50% by the control of first blower open degree by opening the 1st~2 insulation cover, realizes wire rod into insulation cover
Temperature is within the scope of 740~760 DEG C, residence time of the control wire rod in high-temperature oxydation section.Phase change zone is moved forward, is wire rod phase transformation
After iron scale constituent structure transformation provide advantage, close 3~20 insulation covers, close 2~10 frame blowers,
Roller table speed is controlled in 0.1~0.5m/s, wire rod is controlled and goes out insulation cover temperature within the scope of 590~670 DEG C.
The chemical component mass percentage composition of low-alloy cold-forging steel be C:0.33~0.37%, Si%:0.10~0.20,
Mn:0.62~0.72%, Cr:0.82~0.92%, Mo:0.16~0.25%, and including the micro conjunction such as a small amount of Cr, Ni, Cu
Gold element.
Controlling stelmor cooling technique is mainly the thickness for controlling iron scale, it is preferred that emphasis is controls the temperature into insulation cover
Degree controls slower roller table speed within the scope of 740~760 DEG C, finally by the thickness control of medium carbon steel scale on surface
System is at 30~35 μm.
The present invention is in Chang Cai factory 150mm2Production φ 12mm ML35CrMo gren rod in be applied, laying temperature by
830~870 DEG C originally are reduced to 810~850 DEG C, reduce the oxidizing temperature of wire rod scale on surface, reduce this too
You rub cooling line roller table speed as 0.1~0.5m/s, extend the oxidization time of wire rod scale on surface, to control hot rolling
Wire rod iron scale constituent and thickness.It is as shown in table 1 to control process program.
The 1 cold process program of low-alloy cold-forging steel ML35CrMo gren rod control of table
As shown in Figure 1, to be microcosmic using low-alloy cold-forging steel ML35CrMo gren rod iron scale thickness before the present invention
Figure；As shown in Fig. 2, to be microcosmic using iron scale thickness after low-alloy upsetting steel ML35CrMo gren rod control after the present invention
Figure.
It can be seen from the figure that the moderate, Fe using acquisition thickness after the present invention3O4The higher iron scale of content ratio.
As shown in figure 3, to use present invention front and back low-alloy upsetting steel ML35CrMo gren rod X-ray diffraction component analysis
Figure.Upper curve is indicated using Fe after the present invention3O4Content, lower curve are indicated using Fe before the present invention3O4Content.
Table 2 show ML35CrMo control technique before and after thickness and constituent ratio, by laying temperature and control it is cold
The adjustment of technique, finally obtains the iron scale of ML35CrMo gren rod with a thickness of 5 μm, Fe in iron scale3O4Content ratio
It is 68%.After the atmospheric corrosion with one month, discovery using the ML35CrMo of present invention process occur the speed of red rust compared with
Slowly.
2 low-alloy cold-forging steel ML35CrMo hot rolling rod bundle surface iron scale thickness of table and constituent ratio
| Process program | Oxidated layer thickness/μm | Iron scale constituent ratio |
| Before technique | 6 | Fe3O445%, FeO 35%, Fe2O320% |
| After technique | 5 | Fe3O468%, FeO 15%, Fe2O317% |
Term used herein is explanation and term exemplary, and not restrictive.Since the present invention can be with a variety of
Form be embodied without departing from invention spirit or essence, it should therefore be appreciated that above-described embodiment be not limited to it is any above-mentioned
Details, and should widely explaining within the spirit and scope of the appended claims, thus fall into claim or its etc.
Whole change and modification in effect range all should be appended claims and be covered.
Claims (4)
1. a kind of low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method, comprising:
Final rolling temperature control；Mill inlet temperature controls within the scope of 830~870 DEG C, finishing stands temperature rise control 30~
Within the scope of 60 DEG C；
Laying temperature control；Laying temperature controls within the scope of 810~850 DEG C；
Cooling velocity control；Wire rod is controlled into insulation cover temperature within the scope of 740~760 DEG C, out insulation cover temperature 590~
Within the scope of 670 DEG C；In the iron scale of low-alloy the cold heading steel, the content of FeO is lower than 35%, Fe3O4Content is higher than 45%,
Thickness is lower than 35 μm.
2. low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method as described in claim 1, feature exist
In: it is 50% by the control of first blower open degree by opening the 1st~2 insulation cover in cooling velocity control process, it is real
Existing wire rod within the scope of 740~760 DEG C, controls wire rod in the residence time of high-temperature oxydation section into insulation cover temperature；Close 3~20
A insulation cover, closes 2~10 frame blowers, and control roller table speed controls wire rod and go out insulation cover temperature 590 in 0.1~0.5m/s
Within the scope of~670 DEG C.
3. low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method as described in claim 1, feature exist
In: the chemical component mass percentage composition of low-alloy cold-forging steel includes C:0.33~0.37%, Si:0.10~0.20%, Mn:
0.62~0.72%, Cr:0.82~0.92%, Mo:0.16~0.25%, and including Cr, Ni, Cu alloying element.
4. low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method as described in claim 1, feature exist
In: the iron scale of low-alloy the cold heading steel is with a thickness of 5 μm, Fe in iron scale3O4Content ratio is 68%.
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| CN109821912B (en) * | 2019-02-22 | 2020-09-25 | 江苏省沙钢钢铁研究院有限公司 | Post-rolling treatment method and treatment system for wire rod and wire rod |
| CN111036692B (en) * | 2019-11-07 | 2021-03-09 | 河钢股份有限公司承德分公司 | Rolling temperature control method for eliminating red rust on surface of weather-resistant steel of hot-rolled coiled plate |
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| JPH11169913A (en) * | 1997-12-11 | 1999-06-29 | Kawasaki Steel Corp | Manufacture of welded steel tube and steel tube manufacturing line |
| CN101108396A (en) * | 2007-09-06 | 2008-01-23 | 鞍钢股份有限公司 | Control method of high speed wire bar hot rolling surface red rust |
| CN102699055A (en) * | 2012-06-15 | 2012-10-03 | 首钢总公司 | Method for improving mechanical dephosphorization of iron scale of low-carbon cold heading steel wire rod |
| 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 |
| KR101494706B1 (en) * | 2013-07-12 | 2015-02-23 | 주식회사 포스코 | Apparatus for controlling temperature of spindle joint |
| CN104609088A (en) * | 2014-12-23 | 2015-05-13 | 自贡华气科技股份有限公司 | Method for manufacturing underground gas storage device for storing special gas |
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2017
- 2017-05-26 CN CN201710386569.XA patent/CN107321787B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11169913A (en) * | 1997-12-11 | 1999-06-29 | Kawasaki Steel Corp | Manufacture of welded steel tube and steel tube manufacturing line |
| CN101108396A (en) * | 2007-09-06 | 2008-01-23 | 鞍钢股份有限公司 | Control method of high speed wire bar hot rolling surface red rust |
| CN102699055A (en) * | 2012-06-15 | 2012-10-03 | 首钢总公司 | Method for improving mechanical dephosphorization of iron scale of low-carbon cold heading steel wire rod |
| KR101494706B1 (en) * | 2013-07-12 | 2015-02-23 | 주식회사 포스코 | Apparatus for controlling temperature of spindle joint |
| 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 |
| CN104609088A (en) * | 2014-12-23 | 2015-05-13 | 自贡华气科技股份有限公司 | Method for manufacturing underground gas storage device for storing special gas |
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