CN104831046A - Production method of ferrite and martensite tissue duplex steel pipe - Google Patents
Production method of ferrite and martensite tissue duplex steel pipe Download PDFInfo
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- CN104831046A CN104831046A CN201510170101.8A CN201510170101A CN104831046A CN 104831046 A CN104831046 A CN 104831046A CN 201510170101 A CN201510170101 A CN 201510170101A CN 104831046 A CN104831046 A CN 104831046A
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Abstract
A production method of a ferrite and martensite tissue duplex steel pipe belongs to the technical field of duplex steel pipe production method. The method includes raw material loading, multi-pass rolling pipe formation, laser welding, high-speed sizing cutting, heating insulation of the critical zone temperature range, quenching, online roll straightening, aging heating insulation, and high pressure air cooling. The method of the present invention can satisfy the production of duplex steel pipes in different intensity levels, post-weld heat treatment process on the one hand can complete tissue changes to obtain a ferrite and martensite mixed tissue at room temperature, and on the other hand can eliminate processing hardening and residual stress in the formation process, so that the finished pipe has uniform excellent mechanical properties and formability. In the prior at, the duplex steel with higher strength (higher martensite content) is more severe in softening, thus limiting the application of duplex steel welded pipe with higher strength; however, the invention solves the above problem, is innovative in the duplex steel pipe production, and has significant economic benefits.
Description
Technical field
The present invention relates to the dual phase steel steel steel pipe's production method of the uniform ferrite of a kind of performance and martensitic stucture, belong to dual phase steel steel steel pipe's production method and technology field.
Background technology
In order to reduce the discharge of greenhouse gases, automotive light weight technology technology is an inexorable trend, and while the deadweight of reduction vehicle body, vehicle body safety performance is not weakened, and therefore, the application percentage of high-strength steel in body of a motor car manufactures is more and more higher.High-strength dual phase steel, due to while possessing high strength, still has good forming property, so according to the prediction of IISI, in the body of a motor car in future, the ratio of dual phase steel will account for about 74%.Except reducing tare by employing high-strength steel, automaker is also constantly optimized the structure design of automobile, and combine advanced processing mode, as laser tailor welded blanks, hydroforming technology and hot press-formed technology etc., with regard to structure design, increasing automobile component start to adopt pipe fitting to be that raw material carries out processing, as dashboard cradle, some then directly adopts pipe fitting as automobile component, as side door beams.
As the welded tube of raw material, usually following process is needed, this just requires that welded tube has excellent forming property, for automobile accessory frame, traditional way adopts hot rolling micro-alloyed steel to be made by being welded after punching press, but along with the appearance of hydroforming technology is with ripe, producer has been had to adopt the thickness of tensile strength >=440MPa to be that the hot-rolled sheet welded tube of 4.0mm is by obtaining after internal high pressure forming at present, but in order to reduce the weight of part further, propose the idea such as adopting the dual phase steel welded tube of tensile strength >=600MPa to replace low alloy steel welded tube, raw thickness can be reduced to 2.5mm, loss of weight reaches about 40%, but it is different from common hot-rolled low-alloy high-strength steel, even if adopt dual phase steel welded tube prepared by method for laser welding, as DP600, due to the martensitic phase containing about 15% in matrix, under the effect of Thermal Cycle, the martensite meeting tempering of heat affected zone, hardness and intensity is caused to reduce, there is local softening, thus cause the performance in whole welded tube cross section uneven, and appearing in Internal High Pressure Forming of softened zone can become position of preferentially ftractureing, cause being shaped unsuccessfully, and the intensity of dual phase steel is higher, namely martensite content is higher, softening more serious, because which limit the application of more high-strength dual phase steel welded tube.
Summary of the invention
The invention provides a kind of dual phase steel steel pipe's production method of ferrite and martensitic stucture, this method can complete structural transformation, at room temperature obtain ferrite and martensite mixed structure, the work hardening and unrelieved stress that produce in forming process can be eliminated simultaneously, make production tube have uniform excellent mechanical property and forming property.
The technical scheme solved the problems of the technologies described above is:
A kind of dual phase steel steel pipe's production method of ferrite and martensitic stucture, its adopts raw material material loading, multi-pass is rolled into pipe, laser welding, high speed scale are cut, the interval heating and thermal insulation of intercritical temperature, quenching, online roller aligning, timeliness heating and thermal insulation, high-pressure air cooling stages operation, its improvements are, its the interval heating and thermal insulation operation of intercritical temperature adopts electrically heated, nitrogen protection, holding temperature is 800-825 DEG C, and soaking time is 4-12 minute; Its quenching process cools the circumference adopting high pressure water or high pressure gas along welded tube from process furnace welded tube out, and high pressure gas are 90% nitrogen+10% hydrogen; Its timeliness heating and thermal insulation operation adopts electrically heated, nitrogen protection, and Heating temperature is 210-270 DEG C, and soaking time is 5-12 minute.
The dual phase steel steel pipe's production method of above-mentioned ferrite and martensitic stucture, on described raw material, material process is according to the sectional dimension of target welded tube, coil of strip after rip cutting is carried out continuous feeding, raw material is cold-reduced sheet, cold roling reduction >=50%, under room temperature raw material be organized as ferrite and pearlite, producing steel pipe is length≤4m, the pipe of wall thickness≤3.0mm, rectangular tube and special-shaped cross-sectional pipe.
The dual phase steel steel pipe's production method of above-mentioned ferrite and martensitic stucture, the raw thickness of described laser welding operation is≤3.0mm, and adopt the laser welding of 4kW, welding speed is 2.0-6.0m/min, and welding pool adopts argon shield.
The invention has the beneficial effects as follows:
The present invention is a kind of continuous seepage mode, can be produced the welded tube of different cross section shape, as circle, rectangular tube and special-shaped cross-sectional pipe by the design of roll-in section roll shape.Present invention employs laser welding, welding speed is fast, and production efficiency is high, and weld face quality is high, and postwelding weld seam is without the need to clearing up; The whole heat-processed of the operation such as the interval heating and thermal insulation of intercritical temperature of the present invention, quenching, online roller aligning, timeliness heating and thermal insulation adopts nitrogen protection, and avoid oxidation, the surface quality of production tube is excellent; Simultaneously due to the employing of on-line straightening process section, production tube has excellent planeness.Method of the present invention can meet the production of varying strength rank dual phase steel steel pipe, postweld heat treatment can complete structural transformation on the one hand, at room temperature obtain ferrite and martensite mixed structure, the work hardening and unrelieved stress that produce in forming process can be eliminated simultaneously, production tube is made to have uniform excellent mechanical property and forming property, the present invention can continuous seepage dual phase steel steel pipe, the structure and properties of product is even, linearity good (≤0.5mm/m), the intensity solving current dual phase steel is higher, namely martensite content is higher, softening more serious, because which limit a difficult problem for the application of more high-strength dual phase steel welded tube, it is the innovation of dual phase steel steel pipe's production method, there is significant economic benefit.
Embodiment
The present invention takes following operation: raw material material loading, multi-pass are rolled into pipe, laser welding, high speed scale are cut, the interval heating and thermal insulation of intercritical temperature, quenching, online roller aligning, timeliness heating and thermal insulation, high-pressure air cooling stages.
Coil of strip material loading: according to the sectional dimension of target welded tube, coil of strip after rip cutting is carried out continuous feeding, present method can produce the length≤4m of pipe, the pipe of wall thickness≤3.0mm, rectangular tube and special-shaped cross-sectional pipe, raw material is cold-reduced sheet, cold roling reduction >=50%, under room temperature, raw material is organized as ferrite and pearlite.
Multi-pass is rolled into plumber's sequence: multi-pass is rolled into pipe, square tube and various special-shaped cross-sectional pipe.
Laser welding operation: adopt Laser Welding welding, the rated output of laser apparatus is 4kW, and raw thickness is≤3.0mm; welding speed is 2.0-6.0m/min; welding pool adopts argon shield, for the raw material that thickness is certain, can adjust welding speed by the output rating adjusting laser apparatus.
High speed scale is cut: according to the use length of pipe, cuts fast completing the welded tube after welding.
The interval heating and thermal insulation operation of intercritical temperature: adopt electrically heated, nitrogen protection, holding temperature is 800-825 DEG C, and soaking time is 4-12 minute;
Quenching process: the circumference adopting high pressure water or high pressure gas along welded tube from process furnace welded tube is out cooled, high pressure gas are 90% nitrogen+10% hydrogen, cooling tube is ring-type, the hole that on pipe, distributed dimension is identical, can be carried out the rate of cooling of Correctional tube by the adjustment of pressure cooling medium.
Online roller aligning: cooled pipe enters the linearity of roller-way to pipe to be improved.
Timeliness heating and thermal insulation operation: the pipe after row's roller aligning enters timeliness process furnace, electrically heated, nitrogen protection, and Heating temperature is 210-270 DEG C, and soaking time is 5-12 minute.
High-pressure air cools: the pipe completing timeliness adopts high-pressure air to cool after coming out of the stove.
Embodiment 1
Intensity rank is the dual phase steel steel pipe of 450MPa.Raw thickness is 1.0mm, chemical composition (mass percent) is as shown in table 1-1, adopt the laser welding of 4kW, welding speed is 6m/min, adopt argon protection welding region, process furnace insulation is entered after cutting to length, holding temperature is 820 DEG C, soaking time is 4 minutes, carry out employing high-pressure medium (water or gas) after coming out of the stove and be quenched into room temperature, roller-way is aligned, enter aging oven heating and thermal insulation, Heating temperature is 210 DEG C, soaking time is 5 minutes, high-pressure air cooling warehouse-in after coming out of the stove, axial tension is carried out to finished product pipe fitting and carries out straight line degree measurement, as shown shown in 1-2
Table 1-1 tensile strength is the composition (mass percent: %) of 450MPa dual phase steel steel pipe
The mechanical property of table 1-2 production tube and linearity
Embodiment 2:
Intensity rank is the dual phase steel steel pipe of 600MPa.Raw thickness is 1.5mm; chemical composition (mass percent) is as shown in table 2-1; adopt the laser welding of 4kW; welding speed is 4.5m/min; adopt argon protection welding region, enter process furnace insulation after cutting to length, holding temperature is 815 DEG C; soaking time is 5 minutes; adopt high-pressure medium to be quenched into room temperature after coming out of the stove, roller-way is aligned, and enters aging oven heating and thermal insulation; Heating temperature is 230 DEG C; soaking time is 5.5 minutes, then comes out of the stove air-cooled, warehouse-in; axial tension is carried out to finished product pipe fitting and carries out straight line degree measurement, as shown in table 2-2
Table 2-1 tensile strength is the composition (mass percent: %) of 600MPa dual phase steel steel pipe
The mechanical property of table 2-2 production tube and linearity
Embodiment 3:
Intensity rank is the dual phase steel steel pipe of 780MPa.Raw thickness is 2.0 mm; chemical composition (mass percent) is as shown in table 3-1; adopt the laser welding of 4kW; welding speed is 3.8m/min; adopt argon protection welding region, enter process furnace insulation after cutting to length, holding temperature is 820 DEG C; soaking time is 6 minutes; adopt high-pressure medium to be quenched into room temperature after coming out of the stove, roller-way is aligned, and enters aging oven heating and thermal insulation; Heating temperature is 240 DEG C; soaking time is 7 minutes, then comes out of the stove air-cooled, warehouse-in; axial tension is carried out to finished product pipe fitting and carries out straight line degree measurement, as shown in table 3-2
Table 3-1 tensile strength is the composition (mass percent: %) of 780MPa dual phase steel steel pipe
The mechanical property of table 3-2 production tube and linearity
Embodiment 4:
Intensity rank is the dual phase steel steel pipe of 980MPa.Raw thickness is 2.5 mm; chemical composition (mass percent) is as shown in table 4-1; adopt the laser welding of 4kW; welding speed is 3.0m/min; adopt argon protection welding region, enter process furnace insulation after cutting to length, holding temperature is 825 DEG C; soaking time is 8 minutes; adopt high-pressure medium to be quenched into room temperature after coming out of the stove, roller-way is aligned, and enters aging oven heating and thermal insulation; Heating temperature is 250 DEG C; soaking time is 8 minutes, then comes out of the stove air-cooled, warehouse-in; axial tension is carried out to finished product pipe fitting and carries out straight line degree measurement, as shown in table 4-2
Table 4-1 tensile strength is the composition (mass percent: %) of 980MPa dual phase steel steel pipe
The mechanical property of table 4-2 production tube and linearity
| Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (A 80: %) | n 9o | Linearity (mm/m) |
| 645 | 1076 | 11 | 0.12 | 0.50 |
Embodiment 5:
Intensity rank is the dual phase steel steel pipe of 1200MPa.Raw thickness is 3.0 mm; chemical composition (mass percent) as shown in Table 5-1; adopt the laser welding of 4kW; welding speed is 2.0m/min; adopt argon protection welding region, enter process furnace insulation after cutting to length, holding temperature is 800 DEG C; soaking time is 12 minutes; adopt high-pressure medium to be quenched into room temperature after coming out of the stove, roller-way is aligned, and enters aging oven heating and thermal insulation; Heating temperature is 270 DEG C; soaking time is 12 minutes, then comes out of the stove air-cooled, warehouse-in; axial tension is carried out to finished product pipe fitting and carries out straight line degree measurement, as shown in table 5-2.
Table 5-1 tensile strength is the composition (mass percent: %) of 1200MPa dual phase steel steel pipe
The mechanical property of table 5-2 production tube and linearity
。
Claims (3)
1. the dual phase steel steel pipe's production method of a ferrite and martensitic stucture, its adopts raw material material loading, multi-pass is rolled into pipe, laser welding, high speed scale are cut, the interval heating and thermal insulation of intercritical temperature, quenching, online roller aligning, timeliness heating and thermal insulation, high-pressure air cooling stages operation, it is characterized in that: its interval heating and thermal insulation operation of intercritical temperature adopts electrically heated, nitrogen protection, holding temperature is 800-825 DEG C, and soaking time is 4-12 minute; Its quenching process cools the circumference adopting high pressure water or high pressure gas along welded tube from process furnace welded tube out, and high pressure gas are 90% nitrogen+10% hydrogen; Its timeliness heating and thermal insulation operation adopts electrically heated, nitrogen protection, and Heating temperature is 210-270 DEG C, and soaking time is 5-12 minute.
2. the dual phase steel steel pipe's production method of ferrite according to claim 1 and martensitic stucture, it is characterized in that: on described raw material, material process is according to the sectional dimension of target welded tube, coil of strip after rip cutting is carried out continuous feeding, raw material is cold-reduced sheet, cold roling reduction >=50%, under room temperature raw material be organized as ferrite and pearlite, producing steel pipe is length≤4m, the pipe of wall thickness≤3.0mm, rectangular tube and special-shaped cross-sectional pipe.
3. the dual phase steel steel pipe's production method of ferrite according to claim 1 and 2 and martensitic stucture; it is characterized in that: the raw thickness of described laser welding operation is≤3.0mm; adopt the laser welding of 4kW, welding speed is 2.0-6.0m/min, and welding pool adopts argon shield.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111944968A (en) * | 2020-08-06 | 2020-11-17 | 东北大学 | Plate strip steel quenching straightening machine and use method thereof |
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| JPS5794522A (en) * | 1980-12-04 | 1982-06-12 | Nippon Kokan Kk <Nkk> | Method for manufacturing cold rolled steel sheet for drawing having excellent dent resisting property |
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| JP2013227657A (en) * | 2012-03-29 | 2013-11-07 | Kobe Steel Ltd | Method for producing high-strength cold-rolled steel sheet with excellent steel sheet shape |
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- 2015-04-13 CN CN201510170101.8A patent/CN104831046A/en active Pending
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| JPS5794522A (en) * | 1980-12-04 | 1982-06-12 | Nippon Kokan Kk <Nkk> | Method for manufacturing cold rolled steel sheet for drawing having excellent dent resisting property |
| CN102534369A (en) * | 2012-01-13 | 2012-07-04 | 北京科技大学 | Method for preparing N80 steel-grade expansion tubes for petroleum and natural gas exploitation |
| JP2013227657A (en) * | 2012-03-29 | 2013-11-07 | Kobe Steel Ltd | Method for producing high-strength cold-rolled steel sheet with excellent steel sheet shape |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111944968A (en) * | 2020-08-06 | 2020-11-17 | 东北大学 | Plate strip steel quenching straightening machine and use method thereof |
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