DD284420A5 - METHOD FOR THE PRODUCTION OF SEAMLESS PIPES FROM AUTOMATIC STEEL - Google Patents
METHOD FOR THE PRODUCTION OF SEAMLESS PIPES FROM AUTOMATIC STEEL Download PDFInfo
- Publication number
- DD284420A5 DD284420A5 DD32896089A DD32896089A DD284420A5 DD 284420 A5 DD284420 A5 DD 284420A5 DD 32896089 A DD32896089 A DD 32896089A DD 32896089 A DD32896089 A DD 32896089A DD 284420 A5 DD284420 A5 DD 284420A5
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- max
- cold
- production
- forming
- extrusion
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 229910000831 Steel Inorganic materials 0.000 title abstract description 5
- 239000010959 steel Substances 0.000 title abstract description 5
- IHPYMWDTONKSCO-UHFFFAOYSA-N 2,2'-piperazine-1,4-diylbisethanesulfonic acid Chemical compound OS(=O)(=O)CCN1CCN(CCS(O)(=O)=O)CC1 IHPYMWDTONKSCO-UHFFFAOYSA-N 0.000 title 1
- 239000007990 PIPES buffer Substances 0.000 title 1
- 229910000915 Free machining steel Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 abstract description 7
- 238000010622 cold drawing Methods 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000001125 extrusion Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 3
- 239000007858 starting material Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000005554 pickling Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0028—Drawing the rolled product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0078—Extruding the rolled product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Die Erfindung betrifft die Herstellung von nahtlosen Rohren aus Automatenstahl, der aus max. 0,25% C, max. 0,3% Si, max. 2,0% Mn, max. 0,07% P, 0,1 bis 0,24% S, max. 0,004% B, max. 0,05% Bi, Rest Fe besteht. Die Herstellung erfolgt durch Erwaermung von Vormaterial auf etwa 1120C, Strangpressen und nachfolgender Kaltumformung, wobei beim Kaltpilgern 60% und beim Kaltziehen 25% Umformung nicht ueberschritten werden und zwischen Kaltumformoperationen eine Waermebehandlung bei 890-920C erfolgt.{Herstellen; nahtloses Rohr; Automatenstahl; Erwaermen auf 1120C; Strangpressen; Kaltpilgern; Kaltziehen}The invention relates to the production of seamless tubes made of free-cutting steel, consisting of max. 0.25% C, max. 0.3% Si, max. 2.0% Mn, max. 0.07% P, 0.1 to 0.24% S, max. 0.004% B, max. 0.05% Bi, balance Fe. The preparation is carried out by heating of starting material to about 1120C, extrusion and subsequent cold forming, with the cold pilgering 60% and cold drawing 25% deformation are not exceeded and between cold forming operations heat treatment takes place at 890-920C. seamless pipe; Cutting steel; Erwaermen at 1120C; Extrusion; Cold pilgrims; Cold drawing}
Description
mittels Warmumformung und Kaltumformung, dadurch gekennzeichnet, daßby hot forming and cold forming, characterized in that
- das Ausgangsmaterial bei 11200C ± 2O0C austenitisiert wird- The starting material is austenitized at 1120 0 C ± 2O 0 C.
- die Warmumformung durch Strangpressen durchgeführt wird- The hot forming is carried out by extrusion
- eine Kaltumformung mittels Kaltpilgern mit einer max. Gesamtumformung von 60% je Umformgang durchgeführt wird- Cold forming by means of cold pilgering with a max. Total conversion of 60% per deformation cycle is performed
- und/oder eine Kaltumformung mittels Kaltziehen mit einer max. Gesamtumformung von 25% je Umformgang durchgeführt wird- and / or cold forming by cold drawing with a max. Total conversion of 25% per deformation cycle is performed
- zwischen den Kaltumformungen eine Wärmebehandlung bei 890—920°C durchgeführt wird.- A heat treatment at 890-920 ° C is performed between the cold forming.
Die Erfindung betrifft ein Verfahren zur Herstellung von nahtlosen Rohren aus Automatenstahl, die für spangebend hergestellte Gleithülsen, Schneidringe, Hülsen für Hydraulikschlauchleitungen Anwendung finden, und der aus folgenden Bestandteilen besteht: max. 0,25% C, max. 0,30% Si, max. 2,00% Mn, max. 0,070% P, 0,100 bis 0,240% S, max. 0,0040% B, max. 0,05% Bi, Rest Fe.The invention relates to a method for the production of seamless tubes made of free-cutting steel, which are used for machined sliding sleeves, cutting rings, sleeves for hydraulic hose lines application, and consists of the following components: max. 0.25% C, max. 0.30% Si, max. 2.00% Mn, max. 0.070% P, 0.100 to 0.240% S, max. 0.0040% B, max. 0.05% Bi, balance Fe.
Automatenstähle zeichnen sich durch gute Zerspanungseigenschaften aus. Diese werden durch Zulegierungen von Elementen -wie beispielsweise Blei und Phosphor-sowie durch einen erhöhten Schwefelgehalt erreicht und bieten bei der Zerspanung folgende Vorteile:Free-cutting steels are characterized by good machining properties. These are achieved by additions of elements, such as lead and phosphorus, as well as by an increased sulfur content and offer the following advantages during machining:
- erhöhte Schnittgeschwindigkeit- increased cutting speed
- bessere Standzeit der Werkzeuge- better tool life
- bessere Oberflächenbeschaffenheit der Werkstücke und- better surface finish of the workpieces and
- günstige Spanausbildung.- favorable chip training.
Der erhöhte Schwefelgehalt bringt bei der Warmumformung auch Nachteile mit sich, er macht den Stahl zwischen 800 bis 1 000°C rotbrüchig und oberhalb 1 2000C heißbrüchig. Somit ist im Bereich 1000-1200°C eine Warmumformung möglich, wobei aber die unterschiedlichen Beanspruchungen bei den verschiedenen Formgebungsverfahren eine entscheidende Rolle spielen. So schlägt z. B. die DE-PS 972595 für die Herstellung von nahtlosen Rohren aus Automatenstählen als Warmumformungsverfahren das Stiefelverfahren, das Warmpilgern oder das Stoßbankverfahren vor. Die Weiterverarbeitung soll über ein Kaltziehen mit 10% geringerer Querschnittsverminderung als bei Nichtautomatenstählen erfolgen. Nach diesen Verfahren sind mehrere Arbeitsgänge bei der Warmumformung (Lochen, Strecken, Reduzieren) erforderlich, so daß die Einhaltung des angegebenen Temperaturbereiches von 1 260-115O0C zur Vermeidung der Rotbrüchigkeit auf Grund der Anordnung der Umformaggregate bzw. bei Störungen im Produktionsablauf nicht gewährleistet ist und somit Ausfallrohre auftreten, was eine Verschlechterung des Materialausbringens zur Folge hat.The increased sulfur content also brings disadvantages in the hot working, it makes the steel between 800 to 1000 ° C red brittle and above 1 200 0 C hot brittle. Thus, in the range 1000-1200 ° C hot forming is possible, but the different stresses in the various shaping processes play a crucial role. So z. For example, DE-PS 972595 for the production of seamless tubes made of free-cutting steels as hot-forming process, the boot process, the hot pilgrimage or the Stoßbankverfahren before. Further processing is to be carried out by cold drawing with 10% less reduction in cross-section than non-automatic steels. After these processes, several operations in the hot forming (punching, stretching, reducing) are required, so that compliance with the specified temperature range of 1 260-115O 0 C to avoid red brittleness due to the arrangement of Umformaggregate or in case of disturbances in the production process is not guaranteed is and thus failure tubes occur, which has a deterioration of Materialausbringens result.
Ziel der Erfindung ist es, die Warmumformung bei der Herstellung nahtloser Rohre aus Automatenstahl mit verringertem technischen und energetischen Aufwand durchzuführen und damit den Herstellungsaufwand insgesamt zu senken.The aim of the invention is to carry out the hot forming in the production of seamless tubes made of free cutting steel with reduced technical and energy costs and thus to reduce the overall manufacturing cost.
Der Erfindung liegt die Aufgabe zugrunde, bei der Herstellung nahtloser Rohre aus Automatenstahl, der aus max. 0,25% C, max. 0,30% Si, max. 2,00% Mn, max. 0,07% P, 0,100 bis 0,240% S, max. 0,0040% B, max. 0,05% Bi, Rest Fe besteht, die Anzahl der Arbeitsgänge bei der Warmumformung zu verringern und die Kaltumformung so durchzuführen, daß keine Spannungsrisse auftreten.The invention is based, in the production of seamless tubes made of free-cutting steel, the max. 0.25% C, max. 0.30% Si, max. 2.00% Mn, max. 0.07% P, 0.100 to 0.240% S, max. 0.0040% B, max. 0.05% Bi, balance Fe is to reduce the number of hot working operations and to perform the cold working so that no stress cracks occur.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß stranggegossene, geschmiedete oder gewalzte Rundknüppel des o.g. Stahles auf 11200C ± 2O0C austenitisiert und auf einer Strangpresse in einem Arbeitsgang zu einer Lupe umgeformt werden. Die Abkühlung erfolgt an ruhender Luft. Die Weiterverarbeitung erfolgt durch eine Kaltumformung, insbesondere Kaltpilgern mit max. 60% Umformung je Umformgang oder Kaltziehen mit max. 25% Umformung je Umformgang. Zwischen mehreren Kaltumformungen sind Wärmebehandlungen bei 890-9200C vorzunehmen. Vorteile: Mit dieser Verfahrensweise wird erreicht, daßAccording to the invention the object is achieved in that continuously cast, forged or rolled round billets of the above steel are austenitized to 1120 0 C ± 2O 0 C and formed on an extrusion press in one operation to a magnifying glass. The cooling takes place in still air. The further processing takes place by cold forming, in particular cold pilgering with max. 60% forming per forming or cold drawing with max. 25% deformation per forming cycle. Between multiple cold reductions heat treatments are carried out with 890-920 0 C. Advantages: With this procedure it is achieved that
- nur ein Arbeitsgang zur Warmumformung benötigt wird,- only one pass for hot forming is needed,
— die Preßtemperatur niedrig ist und somit Energie eingespart wird.- The pressing temperature is low and thus energy is saved.
Die Erfindung wird nachfolgend an zwei Ausfuhrungsbeispielen erläutert:The invention will be explained below with reference to two exemplary embodiments:
1. Ausführungsbeispiel1st embodiment
Gewalztes Rundmaterial 0 160mm nachfolgender Zusammensetzung:Rolled round material 0 160mm following composition:
0,15% C 0,04% Si 1,36% Mn 0,056% P 0,188% S 0,0015% B Rest Fe0.15% C 0.04% Si 1.36% Mn 0.056% P 0.188% S 0.0015% B remainder Fe
wird wie folgt behandelt:is treated as follows:
- Schälen auf Rundmaterial 0 150mm- Peeling on round material 0 150mm
- Sägen auf Einsatzlänge und Tieflochbohren- sawing on insert length and deep hole drilling
- Austenitisierung auf 11200C ± 20°C- Austenitization to 1120 0 C ± 20 ° C
- Strangpressen zur Luppe 63,5 χ 6,0 mm- Extrusion to the billet 63.5 χ 6.0 mm
- Luftabkühlung- air cooling
- Beizen- pickling
- Kaltpilgern zum Rohr 38 χ 4,0mm Gesamtumformung 60%.- Cold pilgrims to pipe 38 χ 4.0mm total deformation 60%.
2. Ausführungsbeispiel2nd embodiment
Geschmiedetes geschältes Rundmaterial 150mm nachfolgender Zusammensetzung:Forged peeled round material 150mm following composition:
0,12% C 0,13% Si 1,27% Mn 0,047% P 0,250% S 0,0016% B Rest Fe0.12% C 0.13% Si 1.27% Mn 0.047% P 0.250% S 0.0016% B remainder Fe
wird wie folgt behandelt:is treated as follows:
- Sägen auf Einsatzlänge und Tieflochbohren- sawing on insert length and deep hole drilling
- Austenitisierung auf 11200C ± 20°C- Austenitization to 1120 0 C ± 20 ° C
- Strangpressen zur Luppe 63,5 χ 6,0mm- extruding to the doll 63,5 χ 6,0mm
- Luftabkühlung- air cooling
- Beizen- pickling
- Kaltpilgern zum Rohr 38 x 4,0 mm Gesamtumformung 60%- cold pilgrims to pipe 38 x 4.0 mm total deformation 60%
- Wärmebehandlung 890-920°C- Heat treatment 890-920 ° C
- Beizen- pickling
- Kaltpilgern zum Rohr 25 χ 2,5mm Gesamtumformung 59%- Cold pilgrims to pipe 25 χ 2.5mm total conversion 59%
- Wärmebehandlung 890-920°C- Heat treatment 890-920 ° C
- Beizen- pickling
- Kaltziehen zum Rohr 20 χ 2,5 mm Gesamtumformung 23%.- Cold drawing to the pipe 20 χ 2.5 mm total forming 23%.
Claims (1)
max. 0,30% Si
max. 2,00% Mn
max. 0,070% P
0,100 bis 0,240% S
max. 0,0040% B
max. 0,05Bi
Rest FeMax. 0.25% C
Max. 0.30% Si
Max. 2.00% Mn
Max. 0.070% P
0.100 to 0.240% S
Max. 0.0040% B
Max. 0,05Bi
Rest Fe
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD32896089A DD284420A5 (en) | 1989-05-29 | 1989-05-29 | METHOD FOR THE PRODUCTION OF SEAMLESS PIPES FROM AUTOMATIC STEEL |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD32896089A DD284420A5 (en) | 1989-05-29 | 1989-05-29 | METHOD FOR THE PRODUCTION OF SEAMLESS PIPES FROM AUTOMATIC STEEL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DD284420A5 true DD284420A5 (en) | 1990-11-14 |
Family
ID=5609450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DD32896089A DD284420A5 (en) | 1989-05-29 | 1989-05-29 | METHOD FOR THE PRODUCTION OF SEAMLESS PIPES FROM AUTOMATIC STEEL |
Country Status (1)
| Country | Link |
|---|---|
| DD (1) | DD284420A5 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1361003A2 (en) * | 2002-04-18 | 2003-11-12 | Sumitomo Metal Industries, Ltd. | Method for manufacuturing seamless steel tube |
| CN103045837A (en) * | 2013-01-11 | 2013-04-17 | 山西太钢不锈钢股份有限公司 | Manufacturing method of duplex-phase stainless seamless tube |
-
1989
- 1989-05-29 DD DD32896089A patent/DD284420A5/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1361003A2 (en) * | 2002-04-18 | 2003-11-12 | Sumitomo Metal Industries, Ltd. | Method for manufacuturing seamless steel tube |
| EP1361003A3 (en) * | 2002-04-18 | 2005-03-02 | Sumitomo Metal Industries, Ltd. | Method for manufacuturing seamless steel tube |
| CN103045837A (en) * | 2013-01-11 | 2013-04-17 | 山西太钢不锈钢股份有限公司 | Manufacturing method of duplex-phase stainless seamless tube |
| CN103045837B (en) * | 2013-01-11 | 2015-05-06 | 山西太钢不锈钢股份有限公司 | Manufacturing method of duplex-phase stainless seamless tube |
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|---|---|---|---|
| ENJ | Ceased due to non-payment of renewal fee |