CN108118258B - 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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- CN108118258B CN108118258B CN201711223440.3A CN201711223440A CN108118258B CN 108118258 B CN108118258 B CN 108118258B CN 201711223440 A CN201711223440 A CN 201711223440A CN 108118258 B CN108118258 B CN 108118258B
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- steel
- strip
- galvanized
- galvanized tube
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Classifications
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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
Abstract
A kind of production method of strip used for galvanized tube, the steel chemical composition weight percent used for galvanized tube 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 inevitable impurity.The present invention accurately determines the content of the elements such as C, Si, As, P, Ti, avoids the chemical composition ranges for influencing galvanizing quality, eliminates chemical component and adversely affects to zinc coat prominent, blocked up etc. cruelly；By the means such as As content, increase de-scaling passage, reduction coiling temperature in strict control steel, the thickness of strip superficial oxidation iron sheet layer is effectively reduced, improves the finish on strip surface layer, achievees the purpose that improve galvanizing quality.
Description
Technical field
The present invention relates to a kind of special-purpose steel production methods, and the strip used for galvanized tube of zinc coating quality especially can be improved
Production method.
Background technique
Coating steel pipe is the welded still pipe that surface is coated with zinc layers.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 especially oil well pipe of marine oil field, petroleum pipeline, oil heater, condensate cooler, the coal of chemical industry coker, which evaporate, to be washed
Oily exchanger pipe and trestle tubular pole, the support rack pipe in mine tunnel etc..Currently, expressway guardrail pillar is also adopted extensively
It is made of galvanized pipe.Steel used for galvanized tube generallys use mild steel, and 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.It is raw according to common process according to the feedback opinion of downstream client
The strip used for galvanized tube produced generally has phenomena such as zinc-plated uneven, zinc coat is blocked up in carrying out hot dip galvanizing process.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 at
Distribution ratio can also produce serious influence to galvanizing quality.
Summary of the invention
The present invention is directed to overcome the deficiencies of existing technologies, a kind of production method of strip used for galvanized tube, the method are provided
Set up meter and milling method separately by being changed to, prepares 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 that it 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, batch, roughing uses in hot-rolled process
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 the deoxidation of aluminium material, adds mid-carbon fe-mn, and oxygen is determined after furnace, and (O)≤30ppm in steel is protected
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 component to plating
Zinc layers prominent, blocked up etc. cruelly adversely affect；Pass through As content, increase de-scaling passage, reduction coiling temperature in strict control steel simultaneously
Etc. means, the thickness of strip superficial oxidation iron sheet is effectively reduced, improves the finish on strip surface layer, to reduce zinc-plated thickness
Degree, improves zinc-plated uniformity.Correlation data shows that the strip surface layer finish prepared using the method for the present invention is obviously mentioned
Height, strip superficial oxidation thickness of scale are thinned 2-3 times, and zinc-plated rear galvanized layer thickness can reach 200 μm hereinafter, and every physical
It is able to satisfy technical requirements.
Detailed description of the invention
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 using conventional comparative's example product after zinc-plated；
Fig. 5 is iron scale of embodiment of the present invention thickness picture；
Fig. 6 is conventional comparative's example iron scale thickness picture.
Specific embodiment
The present invention, which is studied to find out, influences the major influence factors of zinc-plated effect are as follows: 1, the chemical analysis of strip；2, strip
Surface roughness；3, the iron scale thickness of belt steel surface.Targetedly changed for above three major influence factors
Into as follows:
One, present invention band composition of steel design 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 hot galvanizing raw steel
Constituent content is adjusted to 0.12% or less, avoids the section for influencing zinc-plated effect.In view of product needs to guarantee certain physics
C element content lower limit set is 0.04% by performance, i.e., the control of C element content is within the scope 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 during heating may be used
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 hot galvanizing uses the aluminum killed steel of low silicon thus.Galvanized pipe in routine techniques
It is 0.15-0.25% with steel Si constituent content, Si constituent content is higher, and the present invention is by Si constituent content tune in hot galvanizing raw steel
Whole is 0.04% aluminum killed steel below.
As: when As content is high in steel, the boundary of iron scale and matrix is enriched in As element in Furnace Production Process more
At face, the enrichment phase of low melting point is formed, the binding force of this enrichment phase and matrix is greater than the binding force with iron scale.Test of many times
Show that it is clean that steel surface iron oxide scale is not easy pickling, for this purpose, needing in strict control steel when As content in steel >=0.015%
As content≤0.010%, cooperation reduce coiling temperature, and zinc coat caused by avoiding iron scale pickling from being not thorough is 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, controls Al constituent content in steel in 0.010-0.050%
In range, not only achieve the purpose that deoxidation alloying, but also plays the role of refining crystal grain raising product mechanical property.
P:Fe-Zn alloy-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 controlling sudden and violent lug structure is an important factor for improving galvanizing quality.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, to inhibit the formation of sudden and violent lug structure.Through trying
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 galvanizing quality is improved.But it is 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 jointly and refine the work of crystal grain
With.When N element content is 20-30ppm in steel, Ti/N > 3.4, i.e. Ti constituent content >=0.010% can play refinement crystal grain
Effect.Being added for Ti element can keep the mechanical performance index of strip not reduce after the content for reducing C, Si.
Cu: can be improved the intensity and toughness of steel pipe containing Cu in steel, especially raising atmospheric corrosion resistance.Especially work as Cu
When existing in steel jointly with P, the corrosion resistance of steel pipe is greatly improved.But crackle can be caused when Cu >=0.15%, reduce steel
Toughness, causes hot-short, comprehensively considers physical property, the production cost of steel pipe, and the control of Cu content is in 0.01-0.14% in steel.
Two, 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 lead to 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 structure is generated, it can take out of more than smooth Fe-Zn alloyed layer from zinc pot
More zinc liquid, thus just generates thicker pure zinc layer.The present invention uses three de-scaling of roughing, can effectively remove belt steel surface
Iron scale, hence it is evident that improve strip surface quality.
Three, reduce coiling temperature: 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 advantageous thickness for reducing iron scale is reduced, refinement crystal grain on the other hand can be played
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 extends
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 extends
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 the deoxidation of aluminium material, adds mid-carbon fe-mn, oxygen, (O)≤30ppm in steel, when guaranteeing total soft blow are determined after furnace
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%.
In conventional method hot-rolled process roughing use a time de-scaling, 655 DEG C of coiling temperature.
Referring to Fig. 1, Fig. 2, strip of embodiment of the present invention surface layer is smooth, and the obvious 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 thickness degree
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 of the present invention iron scale thickness
Times.
Claims (2)
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%, Ti/N > 3.4, remaining is for iron and not
Avoidable impurity；
The production method of the strip used for galvanized tube includes smelting, casting, hot rolling, batches, and roughing uses three in hot-rolled process
Secondary de-scaling, de-scaling pressure≤20MPa；Finishing temperature control is at 820~860 DEG C；Oiler temperature control is at 590~620 DEG C.
2. the production method of strip used for galvanized tube according to claim 1, 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 the deoxidation of aluminium material, adds mid-carbon fe-mn, after furnace
Determine oxygen, (O)≤30ppm in steel guarantees 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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| 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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| CN101135024A (en) * | 2006-09-02 | 2008-03-05 | 鞍钢股份有限公司 | Full-hard aluminum-zinc coated steel sheet and method for producing same |
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