CN108118258A - A kind of production method of strip used for galvanized tube - Google Patents
A kind of production method of strip used for galvanized tube Download PDFInfo
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- CN108118258A CN108118258A CN201711223440.3A CN201711223440A CN108118258A CN 108118258 A CN108118258 A CN 108118258A CN 201711223440 A CN201711223440 A CN 201711223440A CN 108118258 A CN108118258 A CN 108118258A
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- steel
- strip
- galvanized
- galvanized tube
- production method
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
A kind of production method of strip used for galvanized tube, the steel chemical composition weight percent used for galvanized tube are as follows：C：0.04 0.12%, Mn：0.30 0.60%, Si：≤ 0.04%, P：0.025 0.045%, S：≤ 0.020%, Als：0.010 0.050%, As：≤ 0.010%, Ti：0.010 0.030%, Cu：0.01 0.14%, remaining is iron and inevitable impurity.The content of the elements such as accurate definite C, Si, As, P, Ti of the invention, avoids influencing the chemical composition ranges of galvanizing quality, eliminates chemical composition to the zinc coat adverse effects such as prominent, blocked up cruelly；By strictly controlling As contents in steel, increasing the means such as de-scaling passage, reduction coiling temperature, the thickness of strip superficial oxidation iron sheet layer is effectively reduced, the finish on strip surface layer is improved, achievees the purpose that improve galvanizing quality.
Description
Technical field
The present invention relates to a kind of special-purpose steel production methods, can particularly improve the strip used for galvanized tube of zinc coating quality
Production method.
Background technology
Coating steel pipe is coated with the welded still pipe of zinc layers for surface.By the zinc-plated resistance to corrosion for increasing steel pipe, extend
Service life.Galvanized pipe has many uses, and in addition to the line pipe for making the general low-pressure fluid such as water delivery, coal gas, oil, also serves as stone
Oily the industry particularly oil well pipe of marine oil field, petroleum pipeline, oil heater, condensate cooler, the coal of chemical industry coker, which evaporate, to be washed
The support rack pipe etc. of oily exchanger pipe and trestle pile pile, mine tunnel.At present, guardrail pillar in expressway is also adopted extensively
It is made of galvanized pipe.Steel generally use mild steel used for galvanized tube, steel production enterprise is by the mild steel hot-rolled coil tubulation of preparation
After be sent to downstream client, then zinc-plated processing is carried out by downstream client.According to the feedback opinion of downstream client, given birth to according to common process
The strip used for galvanized tube of production generally has phenomena such as zinc-plated uneven, zinc coat is blocked up in hot dip galvanizing process is carried out.Study carefully it
Reason, galvanized pipe raw material strip have the problems such as rough surface, iron scale thickness, in addition, steel used for galvanized tube chemistry into
Distribution ratio can also produce serious influence to galvanizing quality.
The content of the invention
It is contemplated that the defects of overcoming the prior art, provides a kind of production method of strip used for galvanized tube, the method
By changing composition design and milling method, prepare that surface layer is highly polished, iron oxide cortex is thin, the zinc-plated requirement that meets high quality
Strip used for galvanized tube.
In order to achieve the above objectives, the technical solution adopted by the present invention is such：
A kind of production method of strip used for galvanized tube, the steel chemical composition weight percent used for galvanized tube are as follows：C：
0.04-0.12%, Mn：0.30-0.60%, Si：≤ 0.04%, P：0.025-0.045%, S：≤ 0.020%, Als：0.010-
0.050%, As：≤ 0.010%, Ti：0.010-0.030%, Cu：0.01-0.14%, remaining is iron and unavoidably miscellaneous
Matter.
The production method of above-mentioned strip used for galvanized tube including smelting, casting, hot rolling, is batched, in hot-rolled process roughing use
Three passage de-scalings, de-scaling pressure≤20Mpa；Finishing temperature control is at 820~860 DEG C；Oiler temperature control is at 590~620 DEG C.
The production method of above-mentioned strip used for galvanized tube, converter smelting endpoint temperature are controlled at 1620-1640 DEG C, and control P≤
0.045%, S≤0.020%；Tapping process adds aluminium material deoxidation, adds mid-carbon fe-mn, determine oxygen after stove, (O)≤30ppm in steel, guarantor
Demonstrate,prove total soft blow time >=10 minute.
The present invention is directed to poor conventional strip surface quality used for galvanized tube, zinc-plated thickness and non-uniform problem and is changed
Into.By further investigation, repetition test, accurately determine that the elements such as C, Si, As, P, Ti to zinc-plated influence, are avoided influencing zinc-plated
The chemical composition ranges of quality reduce C, Si constituent content in steel, control P, Ti constituent content in steel, eliminate chemical composition to plating
The zinc layers adverse effects such as prominent, blocked up cruelly；Simultaneously by strictly controlling As contents in steel, increasing de-scaling passage, reduction coiling temperature
Etc. means, effectively reduce the thickness of strip superficial oxidation iron sheet, the finish on strip surface layer improved, so as to reduce zinc-plated thickness
Degree, improves zinc-plated uniformity.Correction data shows substantially to carry using strip surface layer finish prepared by the method for the present invention
Height, strip superficial oxidation thickness of scale are thinned 2-3 times, and zinc-plated rear galvanized layer thickness can reach less than 200 μm, and every physical
Technology requirement can be met.
Description of the drawings
Fig. 1 is textura epidermoidea of embodiment of the present invention picture；
Fig. 2 is conventional comparative's example textura epidermoidea picture；
Fig. 3 is the galvanized layer thickness picture using product of the embodiment of the present invention after zinc-plated；
Fig. 4 is the galvanized layer thickness picture after zinc-plated using conventional comparative's example product；
Fig. 5 is iron scale thickness picture of the embodiment of the present invention；
Fig. 6 is conventional comparative's example iron scale thickness picture.
Specific embodiment
The present invention is found out through research to be influenced the major influence factors of zinc-plated effect and is：1st, the chemical analysis of strip；2nd, strip
Surface roughness；3rd, the iron scale thickness of belt steel surface.Targetedly changed for above three major influence factors
Into as follows：
First, strip composition design of the present invention is analyzed as follows：
C：Carbon content is higher in base steel, and just more acutely, the weight loss of iron is bigger for iron-zinc reaction.Base steel, which is participated in react, is cured
Acutely, what iron-zinc alloy layer became is thicker, and coating adhesion will degenerate.C element content is 0.15- in former steel used for galvanized tube
0.20%, C element content is higher, this composition range is just the section for influencing zinc-plated effect.The present invention is by C in galvanizing raw steel
Constituent content is adjusted to less than 0.12%, avoids influencing the section of zinc-plated effect.It needs to ensure certain physics in view of product
C element content lower limit set is 0.04% by performance, i.e., the control of C element content is in the range of 0.04-0.12% in steel.
Si：The higher killed steel of silicon content is very big on zinc-plated influence, the main reason is that strip can in heating process
To cause the surface enrichment of silicon, and then cause acutely thickening for zinc-iron alloys layer, adhesion is caused to decline.When zinc-plated, in zinc liquid
Add aluminium, the adhesion of zinc layers can be improved, the raw steel of galvanizing uses the aluminum killed steel of low silicon therefore.Galvanized pipe in routine techniques
It is 0.15-0.25% with steel Si constituent contents, Si constituent contents are higher, of the invention by Si constituent contents tune in galvanizing raw steel
It is whole be less than 0.04% aluminum killed steel.
As：When As contents are high in steel, the boundary of iron scale and matrix is enriched in As elements in Furnace Production Process more
At face, the enrichment phase of low melting point is formed, the combination power of this enrichment phase and matrix is more than and the combination power of iron scale.Test of many times
Show when As contents in steel >=0.015%, it is clean that surface of steel plate iron scale is not easy pickling, for this purpose, need to strictly control in steel
As content≤0.010%, cooperation reduce coiling temperature, iron scale pickling are avoided to be not thorough caused zinc coat uneven.
Al：When zinc-plated, aluminium is added in zinc liquid, the adhesion of zinc layers can be improved, so aluminium content can suitably increase in strip.For
Molten steel oxidation is reduced, converter uses aluminium deoxidation, and Al constituent contents in steel is made to control in 0.010-0.050% while deoxidation
In the range of, not only achieve the purpose that deoxidation alloying, but also play the role of crystal grain thinning and improve product mechanical property.
P：Fe-Zn alloys layer structure can be divided into 3 classes, sudden and violent lug structure, aplitic texture and column structure, and sudden and violent lug structure gets over flash plating
Zinc layers are more uniform, and it is an important factor for improving galvanizing quality to control sudden and violent lug structure.Sudden and violent lug structure most easily in the big crystal boundary of activity and
Surface edges and corners are formed, and phosphorus easily in cyrystal boundary segregation, reduces crystal boundary reactivity, so as to inhibit the formation of sudden and violent lug structure.Through examination
It issues after examination and approval now, P element content is higher in mild steel, and cyrystal boundary segregation amount is bigger, and crystal boundary activity is smaller, so, containing a certain amount of in steel
P can effectively inhibit the formation of sudden and violent lug structure, this point can play an important role to improving galvanizing quality.It is but excessively high in steel
P content can reduce ferrite toughness, so strip of the present invention controls P content in 0.025-0.045%.
Ti：Ti is carbide, can reduce dissolved carbon content, weakens iron-zinc reaction, and iron-zinc alloy layer becomes
It is thin, coating adhesion is improved, while collaboration P element can also be played and inhibit the formation of sudden and violent lug structure and the work of crystal grain thinning jointly
With.When N element content is 20-30ppm in steel, Ti/N ＞ 3.4, i.e. Ti constituent content >=0.010% can play crystal grain thinning
Effect.Adding in for Ti elements can be after the content of C, Si be reduced, and keeping the mechanical performance index of strip does not reduce.
Cu：The intensity and toughness of steel pipe can be improved in steel containing Cu, particularly improves atmospheric corrosion resistance.Especially work as Cu
With P jointly there are in steel when, the corrosion resistance of steel pipe greatly improves.But it can trigger crackle during Cu >=0.15%, reduce steel
Toughness, causes hot-short, considers physical property, the production cost of steel pipe, the control of Cu contents is in 0.01-0.14% in steel.
2nd, hot-rolled process uses three passage de-scalings：
Conventional strip production process used for galvanized tube, using one of de-scaling of roughing, belt steel surface is more coarse.Belt steel surface
Roughening can cause the increase of zinc layer weight.Because belt steel surface is coarse, a series of sags and crests can be generated in steel substrate surface, into
And shaggy spongy Fe-Zn crystalline structures are generated, it can take out of more than smooth Fe-Zn alloyed layers from zinc pot
More zinc liquid, thus just generates thicker pure zinc layer.The present invention can effectively remove belt steel surface using three de-scaling of roughing
Iron scale, hence it is evident that improve strip surface quality.
3rd, coiling temperature is reduced：Oiler temperature control of the present invention is at 590~620 DEG C, and coiling temperature drops compared with prior art
Low 30~90 DEG C.The coiling temperature on the one hand favourable thickness for reducing iron scale is reduced, on the other hand can play crystal grain thinning
Effect, improve the physical property of steel.
Present invention band steel chemical composition embodiment presented below：
Embodiment 1：The chemical component weight percentage of present invention strip used for galvanized tube is as follows：C：0.12%, Mn：
0.50%, Si：0.04%, P：0.035%, S：0.015%, Als：0.019%, As：0.0023%, Ti：0.010%, Cu：
0.011%, remaining is iron and inevitable impurity.Yield strength：326.14MPa, tensile strength：426.47MPa, extension
Rate：29.46%.
Embodiment 2：The chemical component weight percentage of present invention strip used for galvanized tube is as follows：C：0.04%, Mn：
0.60%, Si：0.03%, P：0.045%, S：0.013%, Als：0.030%, As：0.0031%, Ti：0.030%, Cu：
0.055%, remaining is iron and inevitable impurity.Yield strength：315.58MPa, tensile strength：417.65MPa, extension
Rate：29.87%.
Embodiment 3：The chemical component weight percentage of present invention strip used for galvanized tube is as follows：C：0.10%, Mn：
0.30%, Si：0.035%, P：0.025%, S：0.018%, Als：0.040%, As：0.0050%, Ti：0.020%, Cu：
0.10%, remaining is iron and inevitable impurity.Yield strength：329.06MPa, tensile strength：424.74MPa, elongation percentage：
28.96%.
Embodiment 4：The chemical component weight percentage of present invention strip used for galvanized tube is as follows：C：0.08%, Mn：
0.45%, Si：0.02%, P：0.039%, S：0.012%, Als：0.029%, As：0.0030%, Ti：0.015%, Cu：
0.14%, remaining is iron and inevitable impurity.Yield strength：306.87MPa, tensile strength：416.26MPa, elongation percentage：
30.16%.
The method of the present invention：Converter smelting endpoint temperature is controlled at 1620-1640 DEG C, and control P≤0.045%, S≤
0.020%；Tapping process adds aluminium material deoxidation, adds mid-carbon fe-mn, determines oxygen after stove, (O)≤30ppm in steel, when ensureing total soft blow
Between >=10 minutes.Roughing uses three passage de-scalings, de-scaling pressure≤20Mpa in hot-rolled process；Finishing temperature control 820~
860℃；Oiler temperature control is at 590~620 DEG C.
Comparative example：The strip chemical component weight percentage used for galvanized tube of conventional method production is as follows：C：0.172%, Mn：
0.386%, Si：0.16%, P：0.018%, S：0.021%, Als：0.0001%, As：0.0159%, remaining is for iron and not
Evitable impurity.Yield strength：314.85MPa, tensile strength：416.21MPa, elongation percentage：28.68%.
Roughing uses a time de-scaling, 655 DEG C of coiling temperature in conventional method hot-rolled process.
Referring to Fig. 1, Fig. 2, strip of embodiment of the present invention surface layer is smooth, and the apparent bumps in conventional comparative's example strip surface layer are not
It is flat, show that the surface quality of strip of the present invention is significantly better than conventional strip.
Referring to Fig. 3, Fig. 4, using 160 μm of galvanized layer thickness after strip steel Zn-plating of the embodiment of the present invention；Using conventional comparative with
340 μm of galvanized layer thickness after galvanizing steel.Thickness of galvanized layer of band steel of the present invention reduces nearly one compared to conventional products galvanizing steel layer thickness
Times.
Referring to Fig. 5, Fig. 6, strip iron scale thickness of embodiment of the present invention 3.00-3.29um；Conventional comparative's example strip oxygen
Change thickness of scale 7.63-8.81um.Conventional belt steel oxidation thickness of scale is the 2.3-2.9 of product iron scale thickness of the present invention
Times.
Claims (3)
1. a kind of production method of strip used for galvanized tube, it is characterised in that：The steel chemical composition weight percent used for galvanized tube
It is as follows：C：0.04-0.12%, Mn：0.30-0.60%, Si：≤ 0.04%, P：0.025-0.045%, S：≤ 0.020%,
Als：0.010-0.050%, As：≤ 0.010%, Ti：0.010-0.030%, Cu：0.01-0.14%, remaining is iron and can not
The impurity avoided.
2. the production method of strip used for galvanized tube according to claim 1, including smelting, casting, hot rolling, batch, it is special
Sign is：Roughing uses three passage de-scalings, de-scaling pressure≤20Mpa in hot-rolled process；Finishing temperature control is at 820~860 DEG C；
Oiler temperature control is at 590~620 DEG C.
3. the production method of strip used for galvanized tube according to claim 2, it is characterised in that：Converter smelting endpoint temperature control
System controls P≤0.045%, S≤0.020% at 1620-1640 DEG C；Tapping process adds aluminium material deoxidation, adds mid-carbon fe-mn, stove
Determine oxygen afterwards, (O)≤30ppm in steel ensures total soft blow time >=10 minute.
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| CN201711223440.3A CN108118258B (en) | 2017-11-29 | 2017-11-29 | A kind of production method of strip used for galvanized tube |
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| CN201711223440.3A CN108118258B (en) | 2017-11-29 | 2017-11-29 | A kind of production method of strip used for galvanized tube |
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| CN108118258A true CN108118258A (en) | 2018-06-05 |
| CN108118258B CN108118258B (en) | 2019-10-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323256A (en) * | 2022-08-24 | 2022-11-11 | 德龙钢铁有限公司 | Preparation method of hot-rolled strip steel for guardrail plate |
| CN115679210A (en) * | 2022-10-26 | 2023-02-03 | 邯郸钢铁集团有限责任公司 | Hot-rolled pickled plate for eliminating surface black steel defects and production method thereof |
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| CN106544586A (en) * | 2016-10-31 | 2017-03-29 | 首钢总公司 | A kind of effective low carbon low silicon hot-rolled coil of Pneumatic conveying and its manufacture method |
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| CN115679210A (en) * | 2022-10-26 | 2023-02-03 | 邯郸钢铁集团有限责任公司 | Hot-rolled pickled plate for eliminating surface black steel defects and production method thereof |
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| CN108118258B (en) | 2019-10-18 |
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