EP0912264B1 - Verfahren zur herstellung von präzisionsstahlrohren - Google Patents
Verfahren zur herstellung von präzisionsstahlrohren Download PDFInfo
- Publication number
- EP0912264B1 EP0912264B1 EP97932754A EP97932754A EP0912264B1 EP 0912264 B1 EP0912264 B1 EP 0912264B1 EP 97932754 A EP97932754 A EP 97932754A EP 97932754 A EP97932754 A EP 97932754A EP 0912264 B1 EP0912264 B1 EP 0912264B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- cold
- approx
- tubes
- forming
- 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.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 43
- 239000010959 steel Substances 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title description 16
- 238000000137 annealing Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims 2
- 238000010622 cold drawing Methods 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Definitions
- the invention relates to a method for the production of precision steel tubes Cold forming of tube blanks, in particular in several forming steps, with or without inner tool.
- the object of the invention is to propose a method with which Precision steel tubes can be produced, which are a in relation to their strength have extraordinarily high ductility (e.g. elongation at break).
- the invention provides as a feedstock for the production of Precision steel tubes to use tube blanks made of an IF steel.
- IF steels are characterized by very low mass fractions of the elements carbon and Nitrogen from the interstitial sites in the iron crystal lattice (interstitial) store.
- the tube blanks can be seamless by hot rolling under special Conditions or by welding. Here, e.g. usual HF welding process or advantageously also laser welding process (very small heat affected zone) are used.
- the structure of the used Pipe blanks should have a grain size of at least grade ASTM6 up to ASTM9 exhibit.
- composition of the IF steel used in the process according to the invention is expediently as follows: element appropriate composition preferred composition C. ⁇ 0.005% ⁇ 0.003% Si ⁇ 0.2% approx. 0.02% Mn 0.05 - 0.4% 0.05 - 0.15% P ⁇ 0.04% ⁇ 0.01% S ⁇ 0.01% ⁇ 0.005% Al tot 0.02 - 0.05% approx.
- the tube blanks made of IF steel can be passed through in an excellent manner Process cold forming into precision steel tubes.
- Precision tubes usually made from seamless or welded billets more conventional Structural steels made by cold drawing. being because of the restricted Cold forming capacity, cold drawing takes place in a large number of sub-steps (individual pulls) had to, if tubes with a particularly small diameter were to be produced, such as this is the case, for example, with precision steel tubes, which as Fuel injection pipes or as a raw material for rivet production should.
- Fuel injection pipes or as a raw material for rivet production should.
- For fuel injection pipes made of structural steel usually after each Cold drawing performed a normalization annealing. This known process flow is burdened with a lot of effort because of the many work steps.
- IF steel In the seamless or welded tube blanks used according to the invention IF steel, on the other hand, is a very important one in cold forming Reduction in manufacturing costs.
- This cold forming can, for example by cold drawing with or without an inner tool.
- this increase is considerably less than for a carbon steel and in all other usual in precision tube production Steels.
- steel pipes made of IF steels can be used comparatively much smaller number of single trains to a certain one Reduce dimension than is the case with a carbon steel.
- the degree of deformation in each individual train can therefore be greater. Therefore the invention is also advantageous if the cold forming only in a single forming step takes place.
- Annealing a reduction in the deformation resistance can be brought about must, so that the further cold forming can take place on even smaller dimensions.
- the ratio of the number of deformation steps to is expediently Number of anneals at least 3, preferably at least 3.5 and especially preferably at least 4.
- the annealing should be below the Normalization temperature in a temperature range of approximately 680 to 720 ° C respectively. Should largely increase the strength increase after strain hardening remain and at the same time a very high ductility is desired, can at temperatures stress relieved below 550 ° C.
- a seamless tube blank made of an IF steel was used on a cold drawing bench and had the following composition: C. 0.003% Si 0.01% Mn 0.11% P 0.007% S 0.005% Al tot 0.024% Cu 0.05% Cr 0.04% Ni 0.03% Mon 0.01% V ⁇ 0.002% Ti 0.064% Nb 0.0020% B ⁇ 0.0003% N 0.0046% Fe rest
- This pipe blank had a diameter of 42.4 mm and a wall thickness of 5.6 mm and had an average grain size of grade ASTM6.
- the cold drawing was in a total of six individual trains up to a final dimension of 6.0 mm in diameter and 2.0 mm wall thickness. After the third cold draft there was an annealing at 680-720 ° C. If you had made a comparable tube out of St37 steel, cold forming would also have been possible in six cold passes. However, at least three intermediate anneals should have been carried out to achieve the Resistance to deformation of the material on a drawing bench used decrease permissible value.
- Example 2 An HF-welded tube blank of the same size and composition as in Example 1 was used on a cold drawing bench. The average grain size this tube blank corresponded to quality ASTM7. The cold forming was in total 11 cold pulls carried out, the formed tube after the 3rd, 6th and 8th Train was annealed below the normalization temperature at 720 ° C. The Cold forming led to precision tubes with a diameter of only 2.5 mm and 0.25 mm wall thickness. In the case of manufacturing such precision tubes in the conventional way from a St37 would be a total of 13 cold trains and 5 anneals become necessary.
- tube blanks made of IF steel reduce the effort required, though the input material (production of the molten steel) is significantly more expensive must become.
- the targeted use of work hardening by one or more Forming steps are advantageously possible without an undesirably strong one Ductility deterioration. Therefore, technological properties can be represented which are on a par or even superior to simple structural steels (such as St37). This can be achieved with comparatively fewer cold forming steps that the capacity of an existing cold drawing bench can be increased accordingly.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Description
Element | zweckmäßige Zusammensetzung | bevorzugte Zusammensetzung | |
C | < 0,005 % | < 0,003 % | |
Si | < 0,2 % | ca. 0,02 % | |
Mn | 0,05 - 0,4 % | 0,05 - 0,15 % | |
P | < 0,04 % | < 0,01 % | |
S | < 0,01 % | < 0,005 % | |
Alges | 0,02 - 0,05 % | ca. 0,02 % | |
Cu | < 0,1 % | < 0,1 % | |
Cr | < 0,2 % | < 0,1 % | |
Ni | < 0,2 % | < 0,1 % | |
Mo | < 0,1 % | < 0,01 % | |
mindestens | ( Ti | 0,01 - 0,12 % | zusammen |
eines der | |||
beiden Elemente | ( Nb | 0,01 - 0,24 % | ca. 0,06 % |
B | < 0,0005 % | < 0,0003 % | |
N | 0,0020- 0,0120 % | ca. 0,0050 % | |
Rest Eisen und übliche Verunreinigungen |
C | 0,003 % |
Si | 0,01 % |
Mn | 0,11 % |
P | 0,007 % |
S | 0,005 % |
Alges | 0,024 % |
Cu | 0,05 % |
Cr | 0,04 % |
Ni | 0,03 % |
Mo | 0,01 % |
V | < 0,002 % |
Ti | 0,064 % |
Nb | 0,0020 % |
B | < 0,0003 % |
N | 0,0046 % |
Fe | Rest |
Claims (6)
- Verfahren zur Herstellung von Präzisionsstahlrohren durch Kaltumformung von Rohrluppen, insbesondere in mehreren Umformschritten, mit oder ohne Innenwerkzeug,
dadurch gekennzeichnet,
daß als Einsatzmaterial eine Rohrluppe aus IF-Stahl (interstitial free) verwendet wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß ein IF-Stahl mit folgender Zusammensetzung eingesetzt wird:C < 0,005 % Si < 0,2 % Mn 0,05 - 0,4 % P < 0,04 % S < 0,01 % Alges 0,02 - 0,05 % Cu < 0,1 % Cr < 0,2 % Ni < 0,2 % Mo < 0,1 % mindestens eines ( Ti 0,01 - 0,12 % der beiden Elemente ( Nb 0,01- 0,24 % B < 0,0005 % N 0,0020 - 0,0120 % Rest Eisen und übliche Verunreinigungen - Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
daß der IF-Stahl folgende Zusammensetzung aufweist:C < 0,003 % Si ca. 0,02 % Mn 0,05 - 0,15 % P < 0,01 % S < 0,005 % Alges ca. 0,02 % Cu < 0,1 % Cr < 0,1 % Ni < 0,1 % Mo < 0,01 % mindestens eines ( Ti zusammen der beiden Elemente ( Nb ca. 0,06 % B < 0,0003 % N ca. 0,0050 % Rest Eisen und übliche Verunreinigungen - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß nach mehreren Umformschritten jeweils eine Glühung bei 680 bis 720 °C erfolgt, wobei das Verhältnis der Anzahl der Umformschritte zur Anzahl der Glühungen mindestens 3 beträgt. - Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
daß nach der letzten Glühung mindestens noch 1, insbesondere mindestens noch 3 Umformschritte folgen. - Verfahren nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß als Rohrluppen geschweißte, insbesondere lasergeschweißte Stahlrohre eingesetzt werden.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19628714A DE19628714C1 (de) | 1996-07-08 | 1996-07-08 | Verfahren zur Herstellung von Präzisionsstahlrohren |
DE19628714 | 1996-07-08 | ||
PCT/DE1997/001452 WO1998001242A1 (de) | 1996-07-08 | 1997-07-04 | Verfahren zur herstellung von präzisionsstahlrohren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0912264A1 EP0912264A1 (de) | 1999-05-06 |
EP0912264B1 true EP0912264B1 (de) | 2000-02-02 |
Family
ID=7799998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97932754A Expired - Lifetime EP0912264B1 (de) | 1996-07-08 | 1997-07-04 | Verfahren zur herstellung von präzisionsstahlrohren |
Country Status (4)
Country | Link |
---|---|
US (1) | US6290788B1 (de) |
EP (1) | EP0912264B1 (de) |
DE (2) | DE19628714C1 (de) |
WO (1) | WO1998001242A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6419768B1 (en) * | 2001-01-29 | 2002-07-16 | Crucible Materials Corp. | Method for producing welded tubing having a uniform microstructure |
EP1888800B1 (de) * | 2005-05-03 | 2018-11-07 | Posco | Kaltgewalztes stahlblech mit hervorragender verformbarkeit und hervorragendem streckgrenzenverhältnis und herstellungsverfahren dafür |
KR100723163B1 (ko) * | 2005-05-03 | 2007-05-30 | 주식회사 포스코 | 면내이방성이 우수한 냉연강판과 그 제조방법 |
WO2006118424A1 (en) * | 2005-05-03 | 2006-11-09 | Posco | Cold rolled steel sheet having high yield ratio and less anisotropy, process for producing the same |
US20080149230A1 (en) * | 2005-05-03 | 2008-06-26 | Posco | Cold Rolled Steel Sheet Having Superior Formability, Process for Producing the Same |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3975967A (en) * | 1975-04-21 | 1976-08-24 | Dresser Industries, Inc. | Corrosion resistant Bourdon tube |
JPS5828327B2 (ja) * | 1978-04-18 | 1983-06-15 | 日本鋼管株式会社 | 極めて優れた延性を有する極低炭素高張力鋼の製造方法 |
US4210843A (en) * | 1979-04-03 | 1980-07-01 | Zenith Radio Corporation | Color CRT shadow mask and method of making same |
DE3113207C2 (de) * | 1981-04-02 | 1986-01-02 | Harry 6472 Altenstadt König | Verfahren zum Hersstellen eines Anschlußteiles für die Zu- und Ablaufleitung von Plattenheizköpern |
JPH0699759B2 (ja) * | 1987-06-11 | 1994-12-07 | 住友金属工業株式会社 | 深絞り用冷延鋼板の製造方法 |
US4860568A (en) * | 1987-07-27 | 1989-08-29 | Furukawa Aluminum Co., Ltd. | Tubular material drawing apparatus for manufacturing precision tube |
JPH01108346A (ja) * | 1987-10-20 | 1989-04-25 | Nkk Corp | 冷間加工性に優れた電縫鋼管用鋼 |
US5200005A (en) * | 1991-02-08 | 1993-04-06 | Mcgill University | Interstitial free steels and method thereof |
DE69404765T2 (de) * | 1993-06-04 | 1998-03-12 | Katayama Tokushu Kogyo Kk | Batteriebehälter, Blech für die Formgebung des Batteriebehälters und Verfahren für die Herstellung des Bleches |
DE4319431C1 (de) * | 1993-06-11 | 1994-11-03 | Rasselstein Ag | Verfahren zur Herstellung eines kaltgewalzten Stahlbleches als Ausgangsmaterial für die Herstellung von Schattenmasken |
JPH08104945A (ja) * | 1994-05-30 | 1996-04-23 | Nisshin Steel Co Ltd | 耐食性に優れた深絞り用冷延鋼板及びその製造方法 |
FR2728490B1 (fr) * | 1994-12-21 | 1997-01-24 | Lorraine Laminage | Procede de fabrication d'une bande d'acier destinee a la fabrication par emboutissage et re-emboutissage de recipients en acier |
-
1996
- 1996-07-08 DE DE19628714A patent/DE19628714C1/de not_active Expired - Fee Related
-
1997
- 1997-07-04 WO PCT/DE1997/001452 patent/WO1998001242A1/de active IP Right Grant
- 1997-07-04 US US09/214,691 patent/US6290788B1/en not_active Expired - Lifetime
- 1997-07-04 DE DE59701097T patent/DE59701097D1/de not_active Expired - Lifetime
- 1997-07-04 EP EP97932754A patent/EP0912264B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE19628714C1 (de) | 1997-12-04 |
EP0912264A1 (de) | 1999-05-06 |
DE59701097D1 (de) | 2000-03-09 |
WO1998001242A1 (de) | 1998-01-15 |
US6290788B1 (en) | 2001-09-18 |
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