CN102407245A - Method for producing transformation induced plasticity (TRIP) seamless tube - Google Patents
Method for producing transformation induced plasticity (TRIP) seamless tube Download PDFInfo
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- CN102407245A CN102407245A CN2011103334797A CN201110333479A CN102407245A CN 102407245 A CN102407245 A CN 102407245A CN 2011103334797 A CN2011103334797 A CN 2011103334797A CN 201110333479 A CN201110333479 A CN 201110333479A CN 102407245 A CN102407245 A CN 102407245A
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Abstract
The invention belongs to the field of preparation of steel tubes, and in particular relates to a method for producing a transformation induced plasticity (TRIP) seamless tube. The method comprises the following steps that: a smelted ingot is forged into a rod, turned, heated, punched and subjected to cold drawing to obtain a seamless cold drawing steel tube, and the seamless cold drawing steel tube is placed in a resistor furnace for critical region isothermal annealing for 180-1200 seconds at the temperature of 780-850 DEG C, and then is rapidly placed in a salt bath furnace for bainite region isothermal annealing for 120-1800 seconds at the temperature of 380-470 DEG C so as to obtain the TRIP seamless tube. According to the technical scheme in the invention, the chemical components of common low carbon steel can be used for producing the TRIP seamless tube with good comprehensive mechanical properties, high yield strength up to 580MPa, high tensile strength up to 763MPa and high product of strength and elongation up to 22029MPa.%. The method is easy to realize in industrialized production, has the advantages of relatively stable process and relatively low cost, and is suitable for producing TRIP seamless steel tubes with different chemical components and sizes.
Description
Technical field
The invention belongs to the preparation field of steel pipe, be specifically related to a kind of production method of phase change induction plasticity steel seamless pipe.
Background technology
In order to satisfy the demand of environmental protection; The automobile lightweight has become one by the important topic of broad research; Wherein mainly use the ferrous materials of material as automobile, then need be under the prerequisite that guarantees high strength and formability, so reduce the thickness of parts as far as possible. some scholars have developed phase change induction plasticity steel; And being applied in the actual production. the technology that present transformation-induced plasticity steel plate is applied in the automobile lightweight production reaches its maturity; But, then to replace the method for solid parts to realize, along with the maturation of tubing inner high voltage production technology through using hollow component if will further carry out lightweight production; This method is feasible, and realizes that this method needs high-intensity hollow element as realizing carrier.
Forming high pressure in pipe the formability of tubing is had higher requirement, and the parts that are applied on the automobile also has very high requirement for intensity, should take into account high strength and two technical indicators of high-ductility so be applied to the tubing of this technology.At present; Common seamless steel pipe mainly is through perforation and rolling production; Seamless steel pipe Direct Air-Cooled after rolling is to room temperature; Its tissue is mainly ferrite+pearlite, but because there is the contradiction of intensity and plasticity in the common straightcarbon steel seamless pipe, the application in the internal high pressure forming field is restricted always.
At present in the production of seamless steel pipe; Heat treatment is to use to quench to add the traditional handicraft of tempering mostly. such technological advantage is to use comparative maturity; But products obtained therefrom does not have good formability when reaching automobile component institute desired strength, so in the internal high pressure forming process; The difficulty of processing is bigger, and yield rate is low.At present to use comparatively ripe material be main with low-intensity steel pipe, titanium pipe, aluminum pipe and magnesium pipe etc. still to the inner high voltage manufacture field. a lot of scholars have used these material preparations parts with complex section shape such as T type three-way pipe, Y-type three way type pipe, square tube, bellows are generally not high but shortcoming is the intensity of these materials.Afterwards, some scholars began to test as the inner high voltage material processed with stainless steel, had also obtained good result, but stainless cost is higher, still can not satisfy the requirement of producing fully.
Summary of the invention
Problem to the prior art existence; The present invention provides a kind of production method of phase change induction plasticity steel seamless pipe; Purpose is two phase heat treatment of carrying out intercritical annealing and the isothermal hardening of bainite district through to the seamless cold drawing steel tube of low-alloy steel that is processed into through a series of production technologies; Bear and produce phase change induction plasticity steel seamless pipe, satisfy the double requirements of internal high pressure forming tubing intensity and plasticity with favorable forming property.
The microstructure of phase change induction plasticity steel is made up of ferrite, bainite, retained austenite and a small amount of martensite among the present invention.
The chemical composition of phase change induction plasticity steel also has a spot of alloy element Nb and Ti among the present invention except that containing C, Si and Mn, and concrete composition is by mass percentage:
C:0.1 ~ 0.4%, Mn:0.5 ~ 2.0%, Si:0.1 ~ 2.0%, Nb≤1.0%, Ti≤1.0%, Al≤0.4%, P+S≤0.01%, all the other are the impurity that iron and smelting condition produce down.
Realize that technical scheme of the present invention carries out according to following steps:
Smelting-forging rod-turning-heating-perforation-cold-drawn-two phase heat treatment-finished product;
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1150～1250 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Again pipe is carried out the cold-drawn of 3-7 passage; Become and satisfy the size external diameter between 12 ~ 100mm, the seamless cold drawing steel tube of wall thickness≤20mm is put into resistance furnace with seamless cold drawing steel tube and under 780-850 ℃ temperature, is carried out the critical zone isothermal annealing; The annealing time scope be 180s to 1200s, annealing is accomplished the back input and is contained mass fraction 50%NaNO
3+ 50%KNO
3As under 380-470 ℃ temperature, carrying out the isothermal hardening of bainite district in the salt bath furnace of fused-salt medium, the isothermal time scope be 120s to 1800s, can obtain the phase change induction plasticity steel seamless pipe.
Compared with prior art, characteristics of the present invention and beneficial effect are:
The present invention adopts the method for two phase heat treatment to obtain the phase change induction plasticity steel tissue; Two phase heat treatment comprise intercritical annealing and the isothermal hardening of bainite district; Wherein intercritical annealing realizes in the conventional, electric-resistance stove, and the isothermal hardening of bainite district realizes in salt bath furnace;
Intercritical annealing temperature and time and bainite district austempering temperature and time confirms it is one of key technical feature in the two phase heat treatment technological parameters among the present invention; The intercritical annealing temperature of phase change induction plasticity steel seamless pipe confirms between Ac1 and Ac3, and critical annealing temperature and isothermal time should satisfy in the steel pipe tissue of annealing back ferrite and austenitic content than being 1:1 as far as possible; The purpose of bainite district isothermal hardening be for obtain content high as far as possible with stability retained austenite preferably, carry out isothermal hardening in the higher humidity province of bainite and can obtain bigger phase transformation power, to reduce bainite content in the final tissue; And carrying out isothermal hardening in the lower humidity province of bainite, phase transformation power is less relatively, causes final phase transformation incomplete easily; But too high isothermal temperature may cause the deposition of cementite; Make carbon content minimizing in the meta retained austenite, metastable retained austenite may be transformed into martensite in cooling subsequently, therefore; When selecting bainite district isothermal temperature, bainite district austempering temperature is taken at martensite begins more than the transition temperature about 10 ℃; Equally, the selection of bainite district isothermal hardening time is also extremely important, because it directly has influence on content and the stability of retained austenite, and then has influence on final microstructure of phase change induction plasticity steel seamless pipe and mechanical property.If the bainite district isothermal hardening time is too short; There are not enough carbon enrichments in metastable retained austenite; In cooling procedure subsequently, the less retained austenite crystal grain of phosphorus content can be transformed into martensite, thereby causes residual austenite content to reduce; Less stable finally can worsen the comprehensive mechanical property of TRIP steel seamless pipe; Yet long isothermal time can cause containing in the retained austenite oversaturated carbon, can cause the formation of carbide like this, can reduce the volume fraction of retained austenite in the final tissue equally; In sum, the intercritical annealing temperature range of technical scheme of the present invention is chosen to be 780 ℃ to 850 ℃, and the annealing time scope is that 180s is to 1200s; Bainite district austempering temperature scope is 380 ℃ to 470 ℃, and the isothermal time scope is that 120s is to 1800s;
Technical scheme of the present invention is prone in commercial production realize that technology is relatively stable that cost is relatively low;
The present invention is the phase change induction plasticity steel seamless pipe that utilizes the chemical composition of ordinary low-carbon steel to produce to have favorable comprehensive mechanical property, and its yield strength is up to 580MPa, and tensile strength is up to 763MPa, and strength and ductility product is up to 22029MPa%;
Technical scheme of the present invention is fit to the production of the phase change induction plasticity steel seamless pipe of different chemical composition, different size;
Technical scheme of the present invention can be controlled each the phase ratio in the microstructure of phase change induction plasticity steel seamless pipe through the adjustment heat treatment process parameter, and then obtains the phase change induction plasticity steel seamless pipe of different mechanical properties.
Description of drawings
Fig. 1 is two phase heat treatment process schematic representations of the present invention;
Fig. 2 is the process flow diagram of phase change induction plasticity steel seamless pipe of the present invention;
The transmission electron microscope organization chart of the phase change induction plasticity steel seamless pipe that Fig. 3 obtains for the embodiment of the invention 1;
Wherein: (a): the pattern of the retained austenite between ferrite (b): the details in a play not acted out on stage, but told through dialogues diffraction pattern (c) of retained austenite: the retained austenite pattern (d) between bainite ferrite: the film like retained austenite pattern between martensite
F: ferrite; BF: bainite; RA: retained austenite; M: martensite;
The transmission electron microscope organization chart of the phase change induction plasticity steel seamless pipe that Fig. 4 obtains for the embodiment of the invention 2;
Wherein: (a): the pattern of the retained austenite between ferrite (b): the details in a play not acted out on stage, but told through dialogues diffraction pattern (c) of retained austenite: the retained austenite pattern (d) between bainite ferrite: the film like retained austenite pattern between martensite
F: ferrite; BF: bainite; RA: retained austenite; M: martensite;
Fig. 5 adopts the microstructure metallograph of the phase change induction plasticity steel seamless pipe that three kinds of Technologies for Heating Processing obtain for the embodiment of the invention 3;
Fig. 6 adopts the microstructure metallograph of the phase change induction plasticity steel seamless pipe that four kinds of Technologies for Heating Processing obtain for the embodiment of the invention 4.
The specific embodiment
Embodiment 1
The chemical composition of the phase change induction plasticity steel of being selected for use in the present embodiment is by mass percentage: C:0.16%, Mn:1.45%, Si:1.31%; Nb:0.028%, Al:0.04%, P:0.005%; S:0.005%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1150 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Then pipe is carried out 4 passage cold-drawns, become external diameter 43mm, the seamless cold drawing steel tube of wall thickness 1.3mm; Seamless cold drawing steel tube is put into resistance furnace under 800 ℃ temperature, carry out critical zone isothermal annealing 600s, drop into after annealing is accomplished and contain mass fraction 50%NaNO
3+ 50%KNO
3As under 410 ℃ temperature, carrying out isothermal hardening 240s in bainite district in the salt bath furnace of fused-salt medium; Obtain the phase change induction plasticity steel seamless pipe, through measuring, its yield strength is 317MPa; Tensile strength is 690MPa; The elongation of having no progeny is 28.5%, and residual austenite content is 6.91%, and strength and ductility product is 19665MPa%.
The phase change induction plasticity steel seamless pipe that obtains is carried out transmission electron microscope scanning; Obtain transmission electron microscope organization chart as shown in Figure 3; As can beappreciated from fig. 3; The microstructure of steel pipe mainly is made up of ferrite, bainite, retained austenite and a small amount of martensite, and the existence of retained austenite can be passed through its diffraction pattern (Fig. 3 (b)) and confirm that retained austenite mainly is distributed in ferritic crystal boundary (Fig. 3 (a)); Perhaps with the martensite mixed distribution in the inside of polygon bainite ferrite (Fig. 3 (c)); And between the lath strip bainite ferrite (Fig. 3 (d)), and ferritic form is distributed in bainite inner polygonal ferrite and lath-shaped bainite ferrite in addition except that polygonal ferrite.Martensite then always is distributed in the zone that links to each other with retained austenite, all can see martensite on the inner perhaps bainite border adjacent with ferrite of bainite.
Embodiment 2
The chemical composition of the phase change induction plasticity steel of being selected for use in the present embodiment is by mass percentage: C:0.15%, Mn:1.44%, Si:1.34%; Nb:0.029%, Ti:0.024%, Al:0.04%; P:0.007%, S:0.002%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1250 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Again pipe is carried out 4 passage cold-drawns, become external diameter 43mm, the solid drawn tube of wall thickness 1.3mm; Solid drawn tube is put into resistance furnace under 800 ℃ temperature, carry out critical zone isothermal annealing 600s, drop into after annealing is accomplished and contain mass fraction 50%NaNO
3+ 50%KNO
3As under 410 ℃ temperature, carrying out isothermal hardening 240s in bainite district in the salt bath furnace of fused-salt medium; Promptly obtain the phase change induction plasticity steel seamless pipe, through measuring, its yield strength is 300MPa; Tensile strength is 618MPa; The elongation of having no progeny is 35.5%, and residual austenite content is 7.02%, and strength and ductility product is 21939MPa%.
The phase change induction plasticity steel seamless pipe that obtains is carried out transmission electron microscope scanning, obtains transmission electron microscope organization chart as shown in Figure 4,
As can beappreciated from fig. 4, similar with the steel pipe that embodiment 1 obtains, it is organized equally by ferrite, bainite, retained austenite and a small amount of martensite and forms, the existing of retained austenite (Fig. 4 (b)) in confirming to organize through electron diffraction pattern equally.Can find out that from Fig. 4 (a) the part retained austenite is the inside that island is distributed in bainite ferrite, perhaps the crystal boundary place of bainite ferrite; A small amount of martensite presents the distribution similar with retained austenite, and simultaneously, partial martensite is distributed in ferritic crystal boundary place; Martensite by austempering after unsettled retained austenite in being cooled to the room temperature process, be transformed; In addition, in Fig. 4 (a) and 4 (d), can find to have a large amount of dislocations to exist in bainite ferrite and the polygonal ferrite, the existence of dislocation has certain function to the reinforced ferrite matrix; Can see the carbide of deposition in the inside of polygonal ferrite, like Fig. 4 (d).
Embodiment 3
The chemical composition of the phase change induction plasticity steel of being selected for use in the present embodiment is by mass percentage: C:0.14%, Si:0.97%, Mn:1.39%; Nb:0.028%, Ti:0.024%, Al:0.04%; S:0.003%, P:0.005%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1200 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Then pipe is carried out 4 passage cold-drawns, become external diameter, the solid drawn tube of wall thickness 1.3mm at 43mm; Adopt three kinds of Technologies for Heating Processing as shown in table 1 that it is carried out two phase heat treatment, preparation phase change induction plasticity steel seamless pipe.
Table 1 embodiment 3 process for heat treatment of steel pipe
| Numbering | The critical annealing temperature | The intercritical annealing time | Bainite district isothermal temperature | Bainite district isothermal time |
| I | 800℃ | 600s | 410℃ | 180s |
| II | 800℃ | 600s | 410℃ | 360s |
| III | 800℃ | 600s | 410℃ | 540s |
The phase change induction plasticity steel seamless pipe that obtains is carried out Mechanics Performance Testing and structural constituent analysis, and the result is as shown in table 2:
Axial mechanical property after table 2 embodiment 3 heat treatments and tissue volume mark
| Technology | Tensile strength/MPa | Yield strength/Mpa | Percentage elongation/% | Strength and ductility product/MPa% | Strain hardening coefficient | Strain hardening exponent | Plastic strain ratio | Residual austenite content/% |
| I | 763 | 548 | 31.4 | 23943 | 1320.0 | 0.21 | 0.83 | 7.12 |
| II | 728 | 548 | 30.3 | 22029 | 1219.0 | 0.20 | 0.76 | 7.13 |
| III | 715 | 580 | 25.9 | 18260 | 1229.0 | 0.19 | 0.81 | 6.01 |
Present embodiment finally is organized as ferrite, bainite, retained austenite and a small amount of martensite heterogeneous structure through what solid drawn tube is carried out two phase heat treatment obtain; As shown in Figure 5; Can find out that from the tissue that three kinds of Different Heat Treatment Conditions are corresponding when the bainite isothermal time was 180s, the retained austenite that is positioned at the ferrite boundary was more; Along with the increase of isothermal time, residual austenite content presents the trend that reduces; Can find in the table 2 that from mechanical performance index when isothermal time was 540s, because the minimizing of residual austenite content, steel shaft decreased than other two kinds of technologies to percentage elongation, and percentage elongation has a declining tendency along with the increase of isothermal time.
Embodiment 4
The chemical composition of the phase change induction plasticity steel of being selected for use in the present embodiment is by mass percentage: C:0.14%, Si:1.33%, Mn:1.32%, Nb:0.030%, Ti:0.040%, Al:0.04%, S:0.002%; P:0.006%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1200 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Then pipe is carried out 5 passage cold-drawns, become external diameter between 50mm, the solid drawn tube of wall thickness 2mm; Adopt four kinds of Technologies for Heating Processing as shown in table 3 that it is carried out two phase heat treatment, preparation phase change induction plasticity steel seamless pipe.
Table 3 embodiment 4 process for heat treatment of steel pipe
| Numbering | The critical annealing temperature | The intercritical annealing time | Bainite district austempering temperature | The bainite district isothermal hardening time |
| I | 810℃ | 300s | 410℃ | 240s |
| II | 810℃ | 300s | 410℃ | 360s |
| III | 810℃ | 600s | 410℃ | 240s |
| IV | 810℃ | 600s | 410℃ | 360s |
The phase change induction plasticity steel seamless pipe that obtains is carried out Mechanics Performance Testing and structural constituent analysis, and the result is as shown in table 2:
Axial mechanical property after table 4 embodiment 4 heat treatments and tissue volume mark
| Technology | Tensile strength/MPa | Yield strength/Mpa | Percentage elongation/% | Strength and ductility product/MPa% | Strain hardening coefficient | Strain hardening exponent | Plastic strain ratio | Residual austenite content/% |
| I | 655 | 313 | 31.8 | 20796 | 1333.4 | 0.31 | 0.75 | 6.82 |
| II | 638 | 338 | 33.8 | 21516 | 1280.0 | 0.30 | 0.76 | 7.86 |
| III | 705 | 343 | 30.0 | 21150 | 1433.5 | 0.31 | 0.82 | 6.75 |
| IV | 655 | 333 | 35.0 | 22925 | 1320.0 | 0.30 | 0.89 | 9.24 |
Can find out by table 4, the phase change induction plasticity steel seamless pipe under different heat-treat conditions percentage elongation has nearly all surpassed 30%, visible; The Ti element adds the plasticity of raising phase change induction plasticity steel seamless pipe that can be to a certain degree; Under each heat-treat condition, the metallographic structure of gained is as shown in Figure 6, and each phase change induction plasticity steel seamless pipe tissue is formed by ferrite, bainite, retained austenite and a small amount of martensite; When the critical annealing time is 300s; The austempering time, ferrite crystal grain was bigger when being 240s, and retained austenite mainly is distributed in the ferrite crystal boundary; And when isothermal time is 360s, more horse island difficult to understand is arranged in the tissue, be distributed in the inner and crystal boundary place of ferrite crystal grain; When the critical annealing time was 600s, after the bainite district isothermal hardening time extended to 360s by 240s, the ferrite content in the tissue reduced, and the mark of retained austenite increases; Under identical bainite district isothermal hardening condition, the residual austenite content when the critical annealing time is 10min will be higher than the sample that annealing time is 5min.
Embodiment 5
The chemical composition of the phase change induction plasticity steel of being selected for use in the present embodiment is by mass percentage: C:0.1%, Mn:2.0%, Si:0.1%; Nb:1.0%, Ti:.0%, Al:0.4%; P:0.003%, S:0.005%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1150 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Then pipe is carried out 7 passage cold-drawns, become external diameter between 100mm, the seamless cold drawing steel tube of wall thickness 0.8mm; Seamless cold drawing steel tube is put into resistance furnace under 800 ℃ temperature, carry out critical zone isothermal annealing 600s, drop into after annealing is accomplished and contain mass fraction 50%NaNO
3+ 50%KNO
3As under 410 ℃ temperature, carrying out isothermal hardening 240s in bainite district in the salt bath furnace of fused-salt medium, can obtain the phase change induction plasticity steel seamless pipe.
Embodiment 6
The chemical composition of phase change induction plasticity steel also has a spot of alloy element Nb and Ti among the present invention except that containing C, Si and Mn, and concrete composition is by mass percentage: C:0.4%; Mn:0.5%, Si:2.0%, Nb:0.9%; Ti:0.5 %, Al:0.3%, P:0.002; S:0.005%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1250 ℃; Be incubated 2 hours, bore a hole then, after the perforation pipe is cooled to room temperature; Then pipe is carried out 3 passage cold-drawns, become between the external diameter 12mm, the seamless cold drawing steel tube of wall thickness 20mm; Seamless cold drawing steel tube is put into resistance furnace under 780 ℃ temperature, carry out critical zone isothermal annealing 240s, drop into after annealing is accomplished and contain mass fraction 50%NaNO
3+ 50%KNO
3As under 380 ℃ temperature, carrying out isothermal hardening 120s in bainite district in the salt bath furnace of fused-salt medium, can obtain the phase change induction plasticity steel seamless pipe.
Embodiment 7
The chemical composition of phase change induction plasticity steel also has a spot of alloy element Nb and Ti among the present invention except that containing C, Si and Mn, and concrete composition is by mass percentage:
C:0.2%, Mn:0.5 ~ 2.0%, Si:0.1 ~ 2.0%, Nb≤1.0%, Ti≤1.0%, Al≤0.4%, P+S≤0.01%, all the other are the impurity that iron and smelting condition produce down.
Ingot casting after smelting is forged into bar, and bar is removed outer surface fold and defective formation pipe through turning, with heating of pipe blank to 1200 ℃; Be incubated 2 hours; Bore a hole then, after the perforation pipe is cooled to room temperature, then pipe is carried out 6 passage cold-drawns; Become external diameter 80mm; The seamless cold drawing steel tube of wall thickness 1.6mm is put into resistance furnace with seamless cold drawing steel tube and under 850 ℃ temperature, is carried out critical zone isothermal annealing 1200s, drops into rapidly after annealing is accomplished and contains mass fraction mass fraction 50%NaNO
3+ 50%KNO
3As under 470 ℃ temperature, carrying out isothermal hardening 1200s in bainite district in the salt bath furnace of fused-salt medium, can obtain the phase change induction plasticity steel seamless pipe.
Claims (5)
1. the production method of a phase change induction plasticity steel seamless pipe is characterized in that carrying out according to following steps:
Ingot casting after smelting is forged into bar; Bar removes the outer surface fold through turning and defective forms pipe, with heating of pipe blank and insulation, bores a hole then; After the perforation pipe is cooled to room temperature; Again pipe is carried out the cold-drawn of 3-7 passage, obtain seamless cold drawing steel tube, seamless cold drawing steel tube is put into resistance furnace under 780 ~ 850 ℃ temperature, carry out critical zone isothermal annealing 180 ~ 1200s; Drop in the salt bath furnace after annealing is accomplished and under 380 ~ 470 ℃ temperature, carry out bainite district isothermal hardening 120 ~ 1800s, obtain the phase change induction plasticity steel seamless pipe.
2. the production method of a kind of phase change induction plasticity steel seamless pipe according to claim 1 is characterized in that the chemical composition of described phase change induction plasticity steel seamless pipe is by mass percentage: C:0.1 ~ 0.4%, Mn:0.5 ~ 2.0%; Si:0.1 ~ 2.0%, Nb≤1.0%, Ti≤1.0%; Al≤0.4%; P+S≤0.01%, all the other are the impurity that iron and smelting condition produce down, its microstructure is made up of ferrite, bainite, retained austenite and a small amount of martensite.
3. the production method of a kind of phase change induction plasticity steel seamless pipe according to claim 1 is characterized in that the heating of pipe blank to 1150 that obtains after the turning ~ 1250 ℃, insulation 2h.
4. the production method of a kind of phase change induction plasticity steel seamless pipe according to claim 1 is characterized in that the seamless cold drawing steel tube that obtains satisfies the size external diameter between 12 ~ 100mm, wall thickness≤20mm.
5. the production method of a kind of phase change induction plasticity steel seamless pipe according to claim 1 is characterized in that the fused-salt medium in the described salt bath furnace is 50%NaNO by mass percentage
3+ 50%KNO
3
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| CN106521335A (en) * | 2016-10-28 | 2017-03-22 | 东北大学 | High tensile strength and elongation TRIP steel bar material and equa-channel angular pressing preparation method |
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| CN102672026A (en) * | 2012-05-28 | 2012-09-19 | 哈尔滨工业大学 | Method for inhibiting martensite phase transformation in internal high-pressure forming of austenitic stainless steel pipe |
| CN105164282B (en) * | 2013-04-13 | 2019-10-01 | 一钢强力有限公司 | Steel part and the method for producing the steel part |
| CN105164282A (en) * | 2013-04-13 | 2015-12-16 | 一钢强力有限公司 | Steel product and method of producing the product |
| CN103866185A (en) * | 2014-03-14 | 2014-06-18 | 莱芜钢铁集团有限公司 | Preparation method for manufacturing low-cost ultrafine grain transformation-induced plastic steel seamless tube online |
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| CN105695851A (en) * | 2016-04-19 | 2016-06-22 | 常州市蓝勖化工有限公司 | Method for decreasing silicon content of transformation induced plasticity (TRIP) steel during phase transformation process |
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| CN106244924B (en) * | 2016-08-31 | 2017-12-29 | 东北大学 | A kind of cold rolling quenching ductile steel and preparation method |
| CN106244924A (en) * | 2016-08-31 | 2016-12-21 | 东北大学 | A kind of cold rolling quenching ductile steel and preparation method |
| CN106521335A (en) * | 2016-10-28 | 2017-03-22 | 东北大学 | High tensile strength and elongation TRIP steel bar material and equa-channel angular pressing preparation method |
| CN106521337A (en) * | 2016-11-17 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing transformation induced plasticity steel in slab process |
| CN106521337B (en) * | 2016-11-17 | 2018-09-04 | 成都先进金属材料产业技术研究院有限公司 | The method that slab flow produces transformation induced plasticity steel |
| CN110760753A (en) * | 2019-10-25 | 2020-02-07 | 鞍钢股份有限公司 | Low-yield-ratio seamless steel pipe and manufacturing method thereof |
| CN113897552A (en) * | 2021-10-12 | 2022-01-07 | 上海大学 | 30 GPa% |
| WO2023241700A1 (en) * | 2022-06-17 | 2023-12-21 | 宝山钢铁股份有限公司 | High-strength and high-toughness easy-cutting seamless steel tube for motor shaft and manufacturing method therefor |
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