EP3259378B1 - Verfahren zum herstellen eines strangs aus edelstahl - Google Patents

Verfahren zum herstellen eines strangs aus edelstahl Download PDF

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Publication number
EP3259378B1
EP3259378B1 EP16704447.8A EP16704447A EP3259378B1 EP 3259378 B1 EP3259378 B1 EP 3259378B1 EP 16704447 A EP16704447 A EP 16704447A EP 3259378 B1 EP3259378 B1 EP 3259378B1
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EP
European Patent Office
Prior art keywords
billet
stainless steel
strand
gas atmosphere
protective gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16704447.8A
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German (de)
English (en)
French (fr)
Other versions
EP3259378A1 (de
Inventor
Thomas FROBÖSE
Udo RAUFFMANN
Christofer HEDVAL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alleima GmbH
Original Assignee
Sandvik Materials Technology Deutschland GmbH
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Publication date
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Publication of EP3259378A1 publication Critical patent/EP3259378A1/de
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Classifications

    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C21D2211/001—Austenite
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr

Definitions

  • the present invention relates to a method for producing a strand of austenitic stainless steel by cold-forming a shell to form the work-hardened strand and then annealing the strand.
  • Strand-shaped stainless steel products i.e. in particular profiles, rods and tubes, are often produced by cold forming a semi-finished product, referred to in this application as a hollow, into the actual strand.
  • the shell In addition to a change in its dimensions, the shell also experiences strain hardening during cold forming.
  • Cold forming gives the stainless steel strand properties that cannot be achieved through hot forming.
  • strands with high tensile strengths can be produced by cold forming, which cannot or can only be achieved with difficulty in any other way.
  • the elongation of cold-formed strands made of stainless steel is rather low compared to strands made by other forming processes.
  • a method for cold forming a strand is known, the strand being annealed at a temperature of 450 ° C. after the cold forming.
  • the metastable austenitic stainless steel wire for a spring with high strength and high rigidity contains components that are 0.03 to 0.14% C, 0.1 to 4.0% Si, 1.0 to 8.0% Mn, 1 , 0 to 5.0% NiCr and 0.05 to 0.30% N and the remainder contain Fe with the inevitable impurities, the value of Md30 expressed by the specified formula being -10 to 40 ° C.
  • a pipe made of a duplex stainless steel is known with a tensile strength (YS LT ) of 689.1 to 1000.5 MPa in the pipe axis direction, the tensile strength (Y-SLT), the compressive strength (YS LC ) in the pipe axis direction, the tensile strength (YS CT ) in the circumferential direction of the pipe and the compressive strength (YScc) in the circumferential direction of the pipe made of the duplex stainless steel satisfy equations (1) to (4): (1) 0.09 YS LC / YS LT 1.11; (2) 0.90 YS cc / YS CT 1.11; (3) 0.90 YS cc / YS LT 1.11; and (4) 0.90 YS CT / YS LT 1.11.
  • At least one of the aforementioned objects is achieved by a method according to claim 1.
  • this information relates to the surface temperature of the work-hardened strand itself.
  • Cold forming processes in the sense of the present application are all forming processes in which the shell, i.e. the semi-finished product, is formed at temperatures that are below the recrystallization temperature of the austenitic stainless steel used.
  • cold forming takes place in particular by cold pilger rolling or cold drawing.
  • an extended hollow, raw-like shell as a semi-finished product is cold-reduced by compressive stresses in the completely cooled state.
  • the shell is formed into a tube with a defined, reduced outer diameter and a defined wall thickness or thickness.
  • the hollow shell is pushed over a calibrated rolling mandrel, i.e. the inner diameter of the finished pipe, and encompassed from the outside by two calibrated rollers, i.e., the outer diameter of the finished pipe defining, and rolled out in the longitudinal direction over the rolling mandrel.
  • a calibrated rolling mandrel i.e. the inner diameter of the finished pipe
  • two calibrated rollers i.e., the outer diameter of the finished pipe defining, and rolled out in the longitudinal direction over the rolling mandrel.
  • the billet is fed step-by-step in the direction of the rolling mandrel or over it.
  • the rollers are rotated over the mandrel and thus moved over the billet and roll out the billet.
  • the rolls release the shell and this is advanced by a further step in the direction of the tool, ie the roll mandrel or the rolls.
  • the billet is advanced over the mandrel with the aid of a translationally driven clamping slide, which executes a translational movement in a direction parallel to the axis of the rolling mandrel and transfers this to the billet.
  • the billet is also rotated around its longitudinal axis in order to enable the billet to be rolled out evenly.
  • the feed steps are usually smaller than the total stroke of the roll stand between the two reversal points.
  • a strand-shaped billet is pulled through a drawing die, which has an inner diameter that is smaller than the outer diameter of the billet, and thus reshaped and re-dimensioned.
  • drawing tubes between the so-called hollow draw, in which the deformation is only reduced with a previously described drawing die (also referred to as a drawing ring, draw hollow or drawing die), and the so-called core draw or rod draw, in which the The inner diameter and the wall thickness of the drawn tube can be defined by a drawing core arranged in the interior of the shell.
  • the tensile strength in the sense of the present application is understood to mean the stress that is calculated in the tensile test from the maximum tensile force achieved immediately before the sample breaks, based on the original cross-section of the sample.
  • the dimension of tensile strength is force per area.
  • Elongation in the context of the present application is understood to mean the permanent elongation of a strand, which is pulled under the action of force until it breaks, based on the initial measuring length.
  • This elongation is also referred to as elongation at break or yield point.
  • the elongation at break is calculated as the quotient of the remaining change in length after the break divided by the initial length before the force was applied. This gives a dimensionless quantity and is often given as a percentage.
  • a particularly advantageous improvement in tensile strength while maintaining a high degree of elongation compared to a cold forming process, which completely dispenses with annealing after cold forming, is achieved in a range from 410 ° C. to 450 ° C., preferably in a range from 435 ° C. to 445 ° C and particularly preferably at 440 ° C.
  • this protective gas atmosphere advantageously has argon, preferably an argon content of more than 95% by volume.
  • the oxygen content of the protective gas atmosphere during annealing is less than 50 ppm, preferably less than 15 ppm and particularly preferably less than 10 ppm. Then oxidation processes on the surface of the strand are negligible.
  • the dew point of the protective gas atmosphere at atmospheric pressure (1013 mbar) is at a temperature of -40 ° C. or less, preferably -50 ° C. or less.
  • an austenitic stainless steel is understood to mean a face-centered cubic mixed crystal of an iron alloy, in particular a y mixed crystal.
  • a strand in the sense of the present application is in the form of a tube.
  • the method according to the invention is used to manufacture a pipe.
  • Tubes with a high tensile strength and, at the same time, high elongation are required above all in the field of medical implants, but also as high-pressure lines for a wide variety of applications.
  • the work-hardened strand is a tube with an inner diameter and an outer diameter, the inner diameter being half the outer diameter or less, preferably one third of the outer diameter or less.
  • FIG. 10 shows a flow diagram of the method for producing an austenitic stainless steel pipe according to an embodiment of the present invention.
  • the hollow was first cold reduced by cold pilger rollers to a finished dimensioned stainless steel pipe.
  • the tube rolled in this way has an elongation A (H) of 25.0% and a tensile strength Rp 0.2 of 762 N / mm 2 .
  • This cold consist tube was then annealed under a protective gas atmosphere with an argon content of more than 95% by volume at a temperature of 440 ° C.
  • the oxygen content in the protective gas atmosphere was less than 10 ppm.
  • the annealed tube has an elongation A (H) of 15.1% after annealing.
  • the tensile strength Rp 0.2 is 812 N / mm 2 .
  • a tube made of austenitic stainless steel is provided as a shell as the starting material.
  • stainless steel contains carbon with a proportion of not more than 0.06% by weight, manganese with a proportion of not more than 1.8% by weight, silicon with a proportion of not more than 0, 7% by weight, nickel with a proportion of 11% by weight, chromium with a proportion of 17% by weight and molybdenum with a proportion of 2.3% by weight.
  • This shell is then cold-formed by cold pilger rolling in step 2 into a finished dimensioned tube.
  • the finished tube is then annealed in step 3 under a protective gas atmosphere with an argon content of more than 95% by volume and an oxygen content in the protective gas atmosphere of less than 10 ppm at a temperature of 440 ° C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
EP16704447.8A 2015-02-17 2016-02-15 Verfahren zum herstellen eines strangs aus edelstahl Active EP3259378B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015102255.9A DE102015102255A1 (de) 2015-02-17 2015-02-17 Verfahren zum Herstellen eines Strangs aus Edelstahl sowie Strang aus Edelstahl
PCT/EP2016/053114 WO2016131748A1 (de) 2015-02-17 2016-02-15 Verfahren zum herstellen eines strangs aus edelstahl sowie strang aus edelstahl

Publications (2)

Publication Number Publication Date
EP3259378A1 EP3259378A1 (de) 2017-12-27
EP3259378B1 true EP3259378B1 (de) 2021-10-13

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EP16704447.8A Active EP3259378B1 (de) 2015-02-17 2016-02-15 Verfahren zum herstellen eines strangs aus edelstahl

Country Status (7)

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US (1) US10501820B2 (zh)
EP (1) EP3259378B1 (zh)
JP (1) JP7080639B2 (zh)
CN (1) CN107406902A (zh)
DE (1) DE102015102255A1 (zh)
ES (1) ES2898762T3 (zh)
WO (1) WO2016131748A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019102600A1 (de) 2019-02-01 2020-08-06 Sandvik Materials Technology Deutschland Gmbh Verfahren und Vorrichtung zum Herstellen eines stabförmigen Elementes
CN111850422B (zh) * 2020-04-30 2022-01-11 中科益安医疗科技（北京）股份有限公司 高氮无镍奥氏体不锈钢无缝薄壁管材及其制备方法
CN111840659B (zh) * 2020-04-30 2022-02-08 中科益安医疗科技（北京）股份有限公司 高安全性无镍金属药物洗脱血管支架及其制造方法
DE102020133779A1 (de) * 2020-12-16 2022-06-23 Sandvik Materials Technology Deutschland Gmbh Hochdruckrohr und Verfahren zu dessen Herstellung

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KR20110045184A (ko) * 2009-10-26 2011-05-04 금오공과대학교 산학협력단 17-4ｐｈ 스테인레스강의 열처리방법
WO2014034522A1 (ja) * 2012-08-31 2014-03-06 新日鐵住金株式会社 二相ステンレス鋼管及びその製造方法

Also Published As

Publication number Publication date
US10501820B2 (en) 2019-12-10
JP7080639B2 (ja) 2022-06-06
CN107406902A (zh) 2017-11-28
US20180223388A1 (en) 2018-08-09
ES2898762T3 (es) 2022-03-08
JP2018510964A (ja) 2018-04-19
DE102015102255A1 (de) 2016-08-18
WO2016131748A1 (de) 2016-08-25
EP3259378A1 (de) 2017-12-27

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