CN108642375A - The manufacturing method of Micro Alloying micro-alloy steel pipe and Micro Alloying micro-alloy steel pipe - Google Patents
The manufacturing method of Micro Alloying micro-alloy steel pipe and Micro Alloying micro-alloy steel pipe Download PDFInfo
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The present invention provides a kind of manufacturing methods of Micro Alloying micro-alloy steel pipe and Micro Alloying micro-alloy steel pipe, wherein Micro Alloying micro-alloy steel pipe, by percentage to the quality, chemical composition includes：C≤0.40；Si 0.20~0.40；Mn 1.50~1.65；P≤0.020；S≤0.010；V：0.10‑0.12；Cr 0.20~0.35；Ni≤0.20；Cu≤0.20；N≤150ppm；H≤25ppm；O≤30ppm；As+Sn+Pb+Sb+Bi≤0.04%；Remaining is Fe and inevitable impurity.Technical solution through the invention, the reasonable selection of microalloy element, appropriate constituent content proportioning, Micro Alloying production technology so that steel grade is had energy saving, lumber recovery is high, end properties are excellent, with short production cycle, at low cost, many merits such as reduce environmental pollution.
Description
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of Micro Alloying micro-alloy steel pipe and the micro- conjunction of Micro Alloying
The manufacturing method of golden steel pipe.
Background technology
With the rapid development of economy, the increasing and energy crisis of demand for energy and depositing.Therefore, big in China
The high performance steel pipe of power developing low-cost is imperative.In national economy, resource and the energy occupy it is considerable strategically
Position.China's economy is gradually developed by the direction of extensive pattern towards the high-quality such as Precision Machining, deep processing, high added value.Steel
Iron material is still the critical material having a large capacity and a wide range at present, especially has the characteristics that tissue is regulatable, needs extremely to be consumed
When, energy consumption again pollute environment modifier treatment.Therefore, it is along with state using the middle carbon microalloy pearlitic steel without modifier treatment
Border energy shortages and environmental pollution is increasingly severe and a kind of energy-efficient steel for growing up, is used for replacing quenched and tempered steel, is mesh
A preceding important development trend in the world.Non-hardened and tempered steel is to save modifier treatment, by temperature-controlled rolling (or forging), temperature control
The structural material of the cooling novel energy-conserving being combined with heat treatment.Compared with traditional quenched and tempered steel, non-hardened and tempered steel, which has, saves energy
Source, lumber recovery is high, end properties are excellent, with short production cycle, at low cost, many merits such as reduce environmental pollution, and may replace quite
The quenched and tempered steel of quantity is a kind of high-tech green steel grade high in technological content, drive is strong, influence face is big.
The current energy supply and demand contradiction in China is sharp, on the basis of traditional non-hardened and tempered steel, it is necessary to carry out steel product ingredient
Optimization design and cooling controlling and rolling controlling process are further being explored.
Invention content
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, one aspect of the present invention is, a kind of Micro Alloying micro-alloy steel pipe is provided.
Another aspect of the present invention is, provides a kind of manufacturing method of Micro Alloying micro-alloy steel pipe.
In view of this, the technical solution of first aspect present invention provides a kind of Micro Alloying micro-alloy steel pipe, with quality hundred
Divide than meter, chemical composition includes：C≤0.40；Si 0.20~0.40；Mn 1.50~1.65； P≤0.020；S≤0.010；
V：0.10-0.12；Cr 0.20~0.35；Ni≤0.20；Cu≤0.20； N≤150ppm；H≤25ppm；O≤30ppm；As+
Sn+Pb+Sb+Bi≤0.04%；Remaining is Fe and inevitable impurity.
The technical solution of second aspect of the present invention proposes a kind of manufacturing method of Micro Alloying micro-alloy steel pipe, for making
The quenched micro-alloy steel pipe of the technical solution of first aspect is made, including：Molten iron pre-processes：The ingredient of supplied materials molten iron includes：S≤
0.050, P≤0.120%, pretreated molten iron includes：S≤0.010%；Converter smelting：The steel of converter terminal at subpackage
It includes：C >=0.06%, P≤0.015%；It is smelted using single slag technique, finishing slag basicity >=3.0；LF refining：60Kg vanadium nitrogen is added to close
Golden (VN16 alloys) adds vanadium iron, and slag making desulfurization in the refining middle and later periods；VD deaerates：VD depths vacuum degree≤0.06Kpa, it is deep
Vacuum time >=15 minute after VD, feed appropriate silicon-calcium wire, and soft blow Ar is not less than 15 minutes after feeding silk；Round billet continuous casting：
Using electromagnetic agitation technique, molten steel overheat Δ T≤30 DEG C determine pulling rate and permanent pulling rate life according to different round billet sections
Production, round billet enter burial pit and carry out slow cooling, enter to cheat temperature and are more than 600 DEG C, temperature retention time is not less than 48 hours, obtains round billet；It rolls
Pipe：Include successively：Round billet, sawing, annular stove heat, perforation, PQF tandem rollings, stretch reducing and cooling, wherein annular furnace is kept the temperature
Duan Wendu is 1250 DEG C or so, and temperature is 1210 DEG C or so after round billet perforation；Tandem rolling inlet temperature is 1100 DEG C or so；Go out to open
Power reducing mill temperature is 900 DEG C or so, and steel pipe should be quickly cooled down after going out stretch-reducing mill, and cold bed is used expects every arrangement, obtains
Tube body.
Preferably, in the converter smelting, pushing off the slag when tapping is skimmed if pushing off the slag failure.
Preferably, in the VD de-airing steps, silico-calcium line length is determined according to sulfur content in steel, when S≤0.010%
Silicon-calcium wire 300m is added when silicon-calcium wire 240m, S ＞ 0.010% is added.
Preferably, in the tube rolling step, the PQF tandem rollings use three roller retained-mandrel MPM groups.
Beneficial effects of the present invention are as follows：
The technique delivered goods using continuous casting circular tube blank, hot seamless tube and no heat treatment technique reduces the life of seamless pipe product
Cost is produced, environmental pollution is small, and safety is good, optimizes product structure, brings larger economic benefit to be imitated with society for enterprise
Benefit.
The additional aspect and advantage of the present invention will be set forth in part in the description, partly will from the following description
Become apparent, or practice through the invention is recognized.
Specific implementation mode
In order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage, With reference to embodiment
The present invention is further described in detail.It should be noted that in the absence of conflict, embodiments herein and
Feature in embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Embodiment 1：
Micro Alloying micro-alloy steel pipe according to an embodiment of the invention, by percentage to the quality, chemical composition includes：C
≤0.40；Si 0.20~0.40；Mn 1.50~1.65；P≤0.020；S≤0.010；V： 0.10-0.12；Cr 0.20~
0.35；Ni≤0.20；Cu≤0.20；N≤150ppm；H≤25ppm； O≤30ppm；As+Sn+Pb+Sb+Bi≤0.04%；Its
Remaining is Fe and inevitable impurity.
Carbon (C)：Carbon is most effective intensified element in steel, and carbon content is conducive to improve material in increase steel appropriate
The intensity of material, while toughness will decline.Carbon in steel alloy can Intensive intervention body, more important is can with a variety of alloys member
Element generates different types of carbide, improves the thermal stability and wearability of steel.When phosphorus content is higher, carbide quantity increases
Add, the concentration of carbon and alloying element when heating in austenite increases, and so that intensity and hardness is increased, but carbide simultaneously
Degree of segregation also increase, so that the plasticity of steel is reduced, processing performance degenerates.The present invention carries out control appropriate to carbon content,
While ensureing intensity, the toughness of steel, for purposes of the invention, C content≤0.40% are improved.
Manganese (Mn)：Mn improves the important alloying element of the obdurability of non-hardened and tempered steel, influences Micro Alloying through a variety of ways
The tissue and performance of steel.Mn is weak carbide formation element, is mainly present in ferrite in the form of solid solution at room temperature,
Replace a part of Fe atoms to enter and forms alloyed cementite in cementite.Mn is the alloying element for expanding austenitic area, increases Mn
Content will reduce the content of the eutectoid composition carbon of steel, the amount of pearlite caused to increase, and refine pearlite colony and pearlite
Piece interlamellar spacing, at the same can fining ferrite grains improve pearl to improve the obdurability of steel, but the increase of Mn contents
The volume fraction of body of light, makes toughness reduce, and obdurability is in contradictory state.Therefore, for purposes of the invention, Mn content ranges
It is 1.50~1.65%.
Vanadium (V):In middle carbon microalloy pearlitic steel, V is most important micro alloying element, this is because with Nb, Ti etc. its
Its micro alloying element is compared, and the carbonitride of V is in 1100 DEG C of temperatures above Forge Heatings in steel, almost all solid solution
In austenite, thus in the cooling procedure after deformation, the precipitating reinforcing effect of the carbonitride of V is best, mechanical property pair
The dependence of the heating temperature of forging is smaller, thus mostly uses in middle carbon non-hardened and tempered steel individually plus V or to add based on V,
V element has significant impact to the intensity and toughness and fatigue behaviour of non-hardened and tempered steel.For purposes of the invention, V content range
It is 0.10~0.12%.
Chromium (Cr)：Chromium primarily serves the effect of solution strengthening in steel, while expanding austenitic area, advantageously forms pearl
Body of light and the percentage for increasing steel medium pearlite, while pearlite piece interlamellar spacing can also reduced, make the cementite in pearlite
It is thinning.To improve the intensity of non-hardened and tempered steel.Therefore, Cr contents 0.20~0.35%.
Steel grade includes the microalloy element of above range, with energy saving, lumber recovery is high, end properties are excellent, production
Period is short, at low cost, the advantages of reducing environmental pollution.
By the steel pipe tubing that the present invention obtains, by taking 89 × 9.5mm of production specification Φ as an example, chemical composition such as table 1：
1 steel pipe chemical composition statistical result wt.% of the present invention of table
| Example | C | Si | Mn | P | S | V | Cr | Cu | Ni |
| 1 | 0.374 | 0.307 | 1.51 | 0.0123 | 0.007 | 0.116 | 0.312 | 0.009 | 0.007 |
| 2 | 0.369 | 0.319 | 1.57 | 0.0136 | 0.006 | 0.117 | 0.288 | 0.007 | 0.008 |
| 3 | 0.382 | 0.302 | 1.61 | 0.0123 | 0.007 | 0.120 | 0.304 | 0.009 | 0.009 |
| 4 | 0.383 | 0.321 | 1.59 | 0.0136 | 0.006 | 0.116 | 0.297 | 0.006 | 0.007 |
| 5 | 0.374 | 0.309 | 1.63 | 0.0136 | 0.006 | 0.113 | 0.318 | 0.008 | 0.007 |
Steel pipe chemical composition fully meets requirement of the present invention to steel grade, P and S contents are relatively low, meet composition design and want
It asks, and each stove component content deviation very little as can be seen from Table 1, stable ingredient, which is tubing, has good tissue and property
Precondition can be provided.
Embodiment 2：
The manufacturing method of Micro Alloying micro-alloy steel pipe according to an embodiment of the invention, for manufacturing the quenched of embodiment 1
Micro-alloy steel pipe, including：Molten iron pre-processes：The ingredient of supplied materials molten iron includes：S≤0.050, P≤0.120% are pretreated
Molten iron includes：S≤0.010%；Converter smelting：The ingredient of the steel of converter terminal includes：C >=0.06%, P≤0.015%；It adopts
It is smelted with single slag technique, finishing slag basicity >=3.0；LF refining：60Kg VN alloys (VN16 alloys) are added, in the refining middle and later periods
Add vanadium iron, and slag making desulfurization；VD deaerates：VD depths vacuum degree≤0.06Kpa, deep vacuum time >=15 minute, after VD,
Appropriate silicon-calcium wire is fed, soft blow Ar is not less than 15 minutes after feeding silk；Round billet continuous casting：Using electromagnetic agitation technique, molten steel overheat
Δ T≤30 DEG C are spent, pulling rate is determined according to different round billet sections and permanent pulling rate production, round billet enters burial pit and carry out slow cooling, enter
It cheats temperature and is more than 600 DEG C, temperature retention time is not less than 48 hours, obtains round billet；Tube rolling：Include successively：Round billet, sawing, annular furnace
Heating, perforation, PQF tandem rollings, stretch reducing and cooling, wherein annular furnace soaking zone temperature is 1250 DEG C or so, round billet perforation
Temperature is 1210 DEG C or so afterwards；Tandem rolling inlet temperature is 1100 DEG C or so；It is 900 DEG C or so to go out stretch-reducing mill temperature, steel pipe
It should be quickly cooled down after going out stretch-reducing mill, cold bed is used expects every arrangement, obtains tube body.
In the converter smelting, pushing off the slag when tapping is skimmed if pushing off the slag failure.
Preferably, in the VD de-airing steps, silico-calcium line length is determined according to sulfur content in steel, when S≤0.010%
Silicon-calcium wire 300m is added when silicon-calcium wire 240m, S ＞ 0.010% is added.
Preferably, in tube rolling step, the PQF tandem rollings use three roller retained-mandrel MPM groups.
Steel-smelting production process is：Molten iron pretreatment → converter smelting → LF refining → VD degassings → round billet continuous casting.Supplied materials iron
Water must carry out molten iron pretreatment, and supplied materials molten iron requires S≤0.050, P≤0.120%, molten iron pretreatment goal [S] terminal S
≤ 0.010%, to ensure to supply the molten steel quality of converter.To inhibit gas content in material, silicomanganese, ferromanganese, ferrochrome are adding
It must deoxidation alloying before entering；Converter terminal control targe：C >=0.06%, P≤0.015%；It is smelted using single slag technique,
Finishing slag basicity >=3.0；Necessary pushing off the slag when tapping, pushing off the slag failure must skim；Refining will make white slag, and 60Kg vanadium nitrogen is added and closes
Golden (VN16 alloys), remaining adds vanadium iron, and vanadium iron is added in the refining middle and later periods, is made according to converter molten steel ingredient and temperature
Slag desulfurization, composition adjustment and warming temperature, VD depths vacuum degree desired value≤0.06Kpa, deep vacuum time >=15 minute, VD knots
Shu Hou feeds appropriate silicon-calcium wire, and silico-calcium line length is determined according to sulfur content in steel, and silicon-calcium wire 240m is added when S≤0.010%,
When S ＞ 0.010% be added silicon-calcium wire 300m, by have the function that pure molten steel, change field trash property and in the form of；After feeding silk
Soft blow Ar is not less than 15 minutes, to ensure lower gas content in material；Casting process uses electromagnetic agitation technique, molten steel
Degree of superheat Δ T≤30 DEG C are produced according to the suitable pulling rate perseverance pulling rate of different round billet section selections, and round billet should enter burial pit progress
Slow cooling enters to cheat temperature and is more than 600 DEG C, and temperature retention time is not less than 48 hours.It is uniform that low P, low S, ingredient are obtained by this method
High quality round billet.
Tube-rolling technique is：Round billet → sawing → annular stove heat → perforation → PQF tandem rollings → stretch reducing → cooling.Ring
Shape stove soaking zone temperature is 1250 DEG C or so, and temperature is 1210 DEG C or so after round billet perforation；Tandem rolling inlet temperature is 1100 DEG C of left sides
It is right；It is 900 DEG C or so to go out stretch-reducing mill temperature, and steel pipe should be quickly cooled down after going out stretch-reducing mill, and cold bed is used every arrangement
Material, to accelerate the cooling velocity of steel pipe.It is obtained in conjunction with high-end controlling hot rolling technology by three roller retained-mandrel MPM group PQF
Various sizes of high-precision high-quality tube body.
In the present embodiment, process for making：The steel pipe of 89 × 9.5mm of production specification Φ, uses continuous cast round billets section for Φ
210mm, Steel tube Co., Ltd of Baogang fan-shaped sections of steelmaking continuous casting machines arc radius are 12m.It is smelted using single slag technique, is taken off using there is ferro-aluminum
Oxygen, overall process carry out normal Argon；Slag making desulfurization, composition adjustment and heating are carried out according to converter molten steel ingredient and temperature change
Operation, while having made white slag, in casting process using whole process protection casting, select suitable covering slag, electromagnetic agitation technique,
Stringent control pulling rate ensures permanent pulling rate casting, and after strand is offline, round billet enters burial pit slow cooling, and it is small that temperature retention time is more than 48
When.
Tube-rolling technique is：Round billet → sawing → annular stove heat → perforation → PQF tandem rollings → stretch reducing (sizing) → cold
But.Round billet heats in annular furnace, and furnace temperature is 1280 DEG C, heating of pipe blank temperature deviation ± 10 DEG C, ensure heating it is thorough uniformly and
Not burning, time inside furnace is unsuitable long, and perforation is bitten using low speed, stringent controlled rolling rhythm, ensures each process rolling temperature
Degree, it is 1220 DEG C to wear rear temperature, and it is 1100 DEG C to enter tandem mill temperature, and 890 DEG C~910 DEG C of temperature after sizing, steel pipe goes out a tube reducing
It should be quickly cooled down after machine, cold bed is used expects every arrangement, to accelerate the cooling velocity of steel pipe, sawing.
The mechanical properties of pipe of the present invention is as shown in table 2.
2 mechanical properties of pipe of the present invention of table
| Example | Rp0.5(MPa) | Rm(MPa) | Elongation percentage (%) |
| 1 | 707 | 972 | 17.5 |
| 2 | 687 | 939 | 18 |
| 3 | 678 | 943 | 16.5 |
| 4 | 672 | 925 | 17.5 |
| 5 | 698 | 948 | 17 |
As seen from Table 2, method of the invention is well positioned to meet the requirement of high intensity probing steel pipe, and the standard of ZT520 is wanted
Proof strength of non-proportional is asked to be not less than 520MPa, tensile strength is not less than 770MPa, and elongation after fracture is not less than 15%,
Example 1-5 standards of comparison require the performance of ZT520 in the present invention, have higher yield strength and tensile strength, and extend
Rate is also higher, illustrates that the steel pipe of 89 × 9.5mm of specification Φ has good comprehensive mechanical property.
The field trash and tissue grain size of the steel pipe of the present invention are as shown in table 3.
The field trash and tissue grain size of 3 steel pipe of the present invention of table
Note：F indicates that ferrite, P indicate pearlite.
Technical scheme of the present invention is illustrated above in association with embodiment, technical solution through the invention, microalloy element
Reasonable selection, appropriate constituent content proportioning, Micro Alloying production technology make steel grade have it is energy saving, lumber recovery is high, finished product
Function admirable, with short production cycle, at low cost, many merits such as reduce environmental pollution, and reasonably smelts continuous casting process, temperature control rolls
System, temperature control cooling make steel pipe have higher intensity, excellent mechanical property.
In the description of this specification, term " one embodiment ", " some embodiments ", " specific embodiment " etc. are retouched
It states and means that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained in at least one of the present invention
In embodiment or example.In the present specification, schematic expression of the above terms be not necessarily referring to identical embodiment or
Example.Moreover, the particular features, structures, materials, or characteristics of description can be in any one or more of the embodiments or examples
It can be combined in any suitable manner.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of Micro Alloying micro-alloy steel pipe, which is characterized in that by percentage to the quality, chemical composition includes：C≤0.40；
Si 0.20~0.40；Mn 1.50~1.65；P≤0.020；S≤0.010；V：0.10-0.12；Cr 0.20~0.35；Ni≤
0.20；Cu≤0.20；N≤150ppm；H≤25ppm；O≤30ppm；As+Sn+Pb+Sb+Bi≤0.04%；Remaining is for Fe and not
Evitable impurity.
2. a kind of manufacturing method of Micro Alloying micro-alloy steel pipe, micro- for the Micro Alloying described in any one of manufacturing claims 1
Alloy pipe, which is characterized in that including：
Molten iron pre-processes：The ingredient of supplied materials molten iron includes：S≤0.050, P≤0.120%, pretreated molten iron include：S≤
0.010%；
Converter smelting：The ingredient of the steel of converter terminal includes：C >=0.06%, P≤0.015%；It is smelted using single slag technique, eventually
Basicity of slag >=3.0；
LF refining：60Kg VN alloys (VN16 alloys) are added, vanadium iron, and slag making desulfurization are added in the refining middle and later periods；
VD deaerates：VD depths vacuum degree≤0.06Kpa, deep vacuum time >=15 minute after VD, feed appropriate silicon-calcium wire, feed
Soft blow Ar is not less than 15 minutes after silk；
Round billet continuous casting：Using electromagnetic agitation technique, molten steel overheat Δ T≤30 DEG C determine according to different round billet sections and draw
Speed and permanent pulling rate production, round billet enter burial pit progress slow cooling, enter to cheat temperature and are more than 600 DEG C, temperature retention time is not less than 48 hours, obtains
To round billet；
Tube rolling：Include successively：Round billet, sawing, annular stove heat, perforation, PQF tandem rollings, stretch reducing and cooling, wherein annular
Stove soaking zone temperature is 1250 DEG C or so, and temperature is 1210 DEG C or so after round billet perforation；Tandem rolling inlet temperature is 1100 DEG C or so；
It is 900 DEG C or so to go out stretch-reducing mill temperature, and steel pipe should be quickly cooled down after going out stretch-reducing mill, and cold bed is used expects every arrangement, obtains
To tube body.
3. the manufacturing method of Micro Alloying micro-alloy steel pipe according to claim 2, it is characterised in that：The converter smelting
In, pushing off the slag when tapping is skimmed if pushing off the slag failure.
4. the manufacturing method of Micro Alloying micro-alloy steel pipe according to claim 2, which is characterized in that deaerate and walk in the VD
In rapid, silico-calcium line length is determined according to sulfur content in steel, is added when addition silicon-calcium wire 240m, S ＞ 0.010% when S≤0.010%
Silicon-calcium wire 300m.
5. the manufacturing method of Micro Alloying micro-alloy steel pipe according to claim 2, which is characterized in that the tube rolling step
In, the PQF tandem rollings use three roller retained-mandrel MPM groups.
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| CN113528976A (en) * | 2021-06-21 | 2021-10-22 | 山东钢铁股份有限公司 | Non-quenched and tempered bar without surface cracks and preparation method thereof |
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