EP3092087B1 - Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers - Google Patents
Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers Download PDFInfo
- Publication number
- EP3092087B1 EP3092087B1 EP15700041.5A EP15700041A EP3092087B1 EP 3092087 B1 EP3092087 B1 EP 3092087B1 EP 15700041 A EP15700041 A EP 15700041A EP 3092087 B1 EP3092087 B1 EP 3092087B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- rod
- rolling rod
- stand
- hollow block
- 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
Links
- 238000005096 rolling process Methods 0.000 title claims description 133
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000002184 metal Substances 0.000 title 2
- 239000011651 chromium Substances 0.000 claims description 34
- 238000005121 nitriding Methods 0.000 claims description 25
- 229910052804 chromium Inorganic materials 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 21
- 239000000314 lubricant Substances 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 238000005461 lubrication Methods 0.000 claims description 7
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 19
- 239000007800 oxidant agent Substances 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910021538 borax Inorganic materials 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 239000004328 sodium tetraborate Substances 0.000 description 3
- 235000010339 sodium tetraborate Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
Definitions
- the invention relates to a rolling rod as an internal tool in the manufacture of seamless metallic hollow bodies, in particular when stretching metallic hollow blocks to seamless pipes by means of a multi-stand rolling mill, with a surface having a nitriding layer. Furthermore, the invention relates to a method for producing a seamless hot-rolled metallic hollow body, in particular steel tube, in which a previously produced hollow block subjected to a stretching in a roller bar threaded therein according to the present invention, in a multi-stand rolling mill and the rolling rod before the roll insert, ie the Start the threading in the hollow block, provided with a liquid lubricant and which is then dried.
- the preamble of claim 1 is based on the EP 0 601 932 .
- a skew rolling mill produces a so-called hollow block out of a usually massive block.
- pre-drilled blocks can be used instead of solid blocks.
- the second rolling stage of the hollow block is stretched, which today predominantly multi-stand rod mills are used.
- the stretching of the incoming into the rolling mill about 1000 to 1200 ° C hot block takes place via a rolling rod.
- the rolling rod is threaded into the hollow block and usually transported via a driven transport roller to the first rolling stand.
- the number of rolls per framework is usually at least two, today often three, where the process flow is as follows. Bar rolling mills are distinguished on the one hand by the way in which the bar speed is controlled, and on the other by the number of rolls per stand, wherein two or three rolls may be present. There are always several scaffolds connected in series. In the process variant considered here, the rolling rod moves during the actual rolling process at a constant speed through the rolling mill. For this purpose, it must be restrained by an electromechanical system and controlled for constant roll bar speed.
- the restraint system is called a retainer.
- a lubricant In order for the hollow block to be rolled to be able to slide on the rolling bar after the rolling rod has been threaded into the hollow block during the longitudinal stretching during rolling, it must first be provided with a lubricant.
- a graphite-containing lubricant in liquid form is sprayed onto the roll bar and dried at temperatures of 80 to 130 ° C. At lower temperatures the lubricant does not dry out completely, at higher temperatures the so-called Leidenfrost effect occurs, whereby a uniform layer does not occur and parts of the surface remain unlubricated. It is therefore attempted to carry out the drying at temperatures below 100 ° C.
- the hollow block located on the rolling rod is then rolled in the bar mill to a so-called mother tube.
- Mother tube because pipes with different finished diameters can be produced in the third rolling stage by misconductwalzen or stretching reduced from the same mother pipe dimension.
- the rolling rod itself usually consists of a working part and a blind part. The dummy part is required to bridge the necessary process distances. On the blind part of the rolling rod is therefore not rolled.
- bar length will be used for the length of the working part.
- the nitrided layer is supplemented by an oxide layer to be applied thereto.
- the layer thickness of the nitriding layer is specified as 50-500 micrometers, the oxide layer as 3-20 micrometers.
- the difficulty of using surface nitrided billets known per se is that of the entire process, from the manufacture of the billets to the pre-treatment of the billet, the lubrication of the billet and The rolling process itself, so coordinated that a secure rolling process is ensured both for steel tubes made of unalloyed steel grades to heavy thermoformable chromium-containing steels.
- the object of the invention is therefore to provide a rolling rod as an internal tool in the manufacture of seamless metallic hollow bodies, in particular when stretching metallic hollow blocks to seamless pipes by means of a multi-stand rolling mill, and a method for producing a seamless hot-rolled metallic hollow body, in particular steel pipe, which, at Hardly deformable pipe materials, in particular chromium-containing pipe materials, an improved service life of the rolling rod achieved and occurring during rolling errors on the inner surface of the tube can be effectively minimized or avoided.
- Next is to be achieved in comparison with the known nitrided rolling rods a comparable or better life waiving the de-oxidation of the hollow block inner surface with borax-containing agents.
- a rod is to be obtained under a rolling rod, which, contrary to a mandrel rod, does not have a head with an enlarged diameter but is a rod with a round cross section of constant size.
- the proposed method and the rolling rod used for it have the advantage that now hollow body made of difficult to convert materials with optimum inner surface can be produced economically at the same time significantly increased life of the rolling rod.
- the rod surface In order to ensure the successful entry of rolling rods, the rod surface must have a certain minimum hardness before nitriding. Investigations have shown that this limit at 200 HV 0.5 measured is 0.5 mm below the surface of the unnitrided rod. It is advantageous if this minimum hardness extends into the core of the rod, wherein at least 50% of the diameter of the rolling rod should be at least 60% of the minimum hardness available.
- the application of the nitriding layer on the rolling rod is done according to an advantageous embodiment of the invention at a temperature which is at most 20% below the tempering temperature of the steel material of the rolling rod.
- the method does not matter.
- the only important factor is the formation of the nitriding layer in the required form. This should advantageously have a Nitrierhärtiefe of more than 0.15 mm.
- a near-surface hardness of more than 950 HV 0.5 is necessary, measured on the cross sections of reference samples that follow the nitriding process.
- Table 1a shows the chemical composition of various tested bar materials.
- Table 1b shows the calculated values for the chromium equivalent Cr eq - calculated according to the equation (1)
- Cr eq . (% By weight) % Cr +% Mo + 1.5 x% Si + 0.5 x% Nb + 2 x% Ti and whether a sufficient nitriding layer thickness, nitriding layer depth and basic hardness were achieved.
- material Cr eq . sufficient nitriding layer thickness, nitriding layer depth and basic hardness A min 6.6 Yes Max 8.5 B min 7.1 Yes Max 8.8 C min 12 Yes Max 8.8 D Ref. 6.1 No e Ref. 2.0 No
- the materials A, B and C have a chromium equivalent which is above the required value of 6.5, while the reference materials D and E have lower values.
- the hot-working steel used must still have a yield strength of at least 450 MPa and a tensile strength of at least 600 MPa at 500 ° C, in addition to the already mentioned chromium equivalent.
- the lubricant must meet certain conditions. When sprayed onto the rolling rod, lubricants still contain water, which should preferably be completely evaporated before being threaded into the hollow block. To ensure complete evaporation, the surface temperature of the roll bar should be at least 70 ° C before applying the lubricant.
- the residual dry quantity requires a basis weight of at least 40 g / m 2 lubricant on the rolling rod in order to ensure a sufficient lubricating effect during rolling. It has proved to be particularly advantageous when rolling steels with a chromium content of more than 5% by weight when a dry lubricant quantity of lubricant, ie at least 80 g / m 2 , which is at least twice as large, is applied to the rolling rod.
- the applied amount of the lubricant is here related to the surface of the rolling rod.
- the load is distributed over the largest possible length.
- the working part of the rolling rod L ST must not be too long, otherwise the rod weights are too large. It has proven particularly advantageous if the rod length is limited to a maximum of 50% of the maximum possible rolling length in the rod rolling mill.
- the rolling rod consists of a working part and a blind part, wherein at least the working part is provided with the nitriding layer.
- the speed of the rod V ST must not exceed a maximum value for the ratio bar length / rolling time, because otherwise the working range of the bars during rolling is exceeded.
- rolling time here the rolling time of the last stand of the bar mill is defined.
- V STMAX 0.9 ⁇ rod length / Walzzeit last framework
- this game should be at least 10 mm and the average temperature of the hollow block above 1000 ° C.
- the roll bar according to the invention and the rolling process according to the invention already excellent service life of the rolling rods can be realized without causing an additional de-oxidation of the inner surface of the Hollow blocks required, it may occasionally be advantageous for very difficult to be formed materials to perform an additional de-oxidation, in which case the basis weight of the de-oxidizing agent at least 100 g / m 2 and the time between the end of the application of the de-oxidizing agent and the beginning Rolling on the roll bar should be at least 30 s.
- the applied amount of the de-oxidizing agent is based on the inner surface of the hollow block.
- the nitriding of the surface of the rolling rod according to the invention is carried out so that the formation of pores open to the surface is promoted, which act as lubricant pockets or reservoirs and thus increase the service life of the rolling rod by improved lubrication.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Steel (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014100107.9A DE102014100107B4 (de) | 2014-01-07 | 2014-01-07 | Walzstange als Innenwerkzeug beim Herstellen von nahtlosen metallischen Hohlkörpern und Verfahren zur Herstellung eines metallischen Hohlkörpers |
PCT/EP2015/050065 WO2015104244A1 (de) | 2014-01-07 | 2015-01-05 | Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3092087A1 EP3092087A1 (de) | 2016-11-16 |
EP3092087B1 true EP3092087B1 (de) | 2018-03-28 |
Family
ID=52302223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15700041.5A Active EP3092087B1 (de) | 2014-01-07 | 2015-01-05 | Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers |
Country Status (12)
Country | Link |
---|---|
US (1) | US10239102B2 (es) |
EP (1) | EP3092087B1 (es) |
JP (1) | JP6603665B2 (es) |
CN (1) | CN105848798B (es) |
AR (1) | AR098859A1 (es) |
BR (1) | BR112016010765B1 (es) |
DE (1) | DE102014100107B4 (es) |
EA (1) | EA031146B1 (es) |
ES (1) | ES2674648T3 (es) |
MX (1) | MX2016008907A (es) |
UA (1) | UA114864C2 (es) |
WO (1) | WO2015104244A1 (es) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014110980B4 (de) | 2014-08-01 | 2017-10-26 | Vallourec Deutschland Gmbh | Verfahren zur Herstellung von warmgewalzten nahtlosen Rohren mit verdickten Enden |
DE102016106035A1 (de) * | 2016-04-01 | 2017-10-05 | Sandvik Materials Technology Deutschland Gmbh | Kaltpilgerwalzanlage und Verfahren zum Herstellen eines Rohres |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3742155C2 (de) | 1987-12-10 | 1995-01-05 | Mannesmann Ag | Vorrichtung zur Herstellung nahtloser Rohre |
JPH05253613A (ja) | 1992-03-10 | 1993-10-05 | Sumitomo Metal Ind Ltd | 熱間押出用マンドレル |
JP2924523B2 (ja) | 1992-12-11 | 1999-07-26 | 住友金属工業株式会社 | マンドレルミルによる金属管の延伸圧延方法 |
JPH06262220A (ja) | 1993-03-12 | 1994-09-20 | Sumitomo Metal Ind Ltd | 熱間継目無管製造用マンドレルバー |
JP2822892B2 (ja) | 1994-09-09 | 1998-11-11 | 住友金属工業株式会社 | 熱間継目無管圧延用マンドレルバー |
DE19714317C1 (de) * | 1997-03-25 | 1998-06-18 | Mannesmann Ag | Verfahren zur Oberflächenbehandlung von Werkzeugen aus Stahl, insbesondere von Kaltpilger-Walzdornen zur Kaltumformung von Rohren |
JP2003253422A (ja) | 2002-03-04 | 2003-09-10 | Sanyo Special Steel Co Ltd | マンドレルあるいは成形金型などの工具の高寿命化方法および高寿命化されたマンドレルあるいは成形金型などの工具 |
CN100464883C (zh) | 2003-06-04 | 2009-03-04 | 住友金属工业株式会社 | 热轧无缝管用镀Cr芯棒和它的制造方法 |
JP4305673B2 (ja) | 2004-06-18 | 2009-07-29 | 住友金属工業株式会社 | 継目無鋼管の製造方法 |
WO2007114173A1 (ja) | 2006-03-28 | 2007-10-11 | Sumitomo Metal Industries, Ltd. | 高合金圧延用マンドレルバー、その表面処理方法および製造方法、ならびに継目無鋼管製造装置の操業方法 |
JP4992603B2 (ja) | 2007-08-14 | 2012-08-08 | 住友金属工業株式会社 | 熱間継目無製管用マンドレルバーの表面処理方法 |
-
2014
- 2014-01-07 DE DE102014100107.9A patent/DE102014100107B4/de not_active Withdrawn - After Issue
- 2014-12-19 AR ARP140104794A patent/AR098859A1/es active IP Right Grant
-
2015
- 2015-01-05 JP JP2016543007A patent/JP6603665B2/ja active Active
- 2015-01-05 US US15/109,187 patent/US10239102B2/en active Active
- 2015-01-05 ES ES15700041.5T patent/ES2674648T3/es active Active
- 2015-01-05 WO PCT/EP2015/050065 patent/WO2015104244A1/de active Application Filing
- 2015-01-05 EA EA201690808A patent/EA031146B1/ru not_active IP Right Cessation
- 2015-01-05 EP EP15700041.5A patent/EP3092087B1/de active Active
- 2015-01-05 MX MX2016008907A patent/MX2016008907A/es unknown
- 2015-01-05 UA UAA201605690A patent/UA114864C2/uk unknown
- 2015-01-05 BR BR112016010765-9A patent/BR112016010765B1/pt active IP Right Grant
- 2015-01-05 CN CN201580003280.4A patent/CN105848798B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
BR112016010765A2 (es) | 2017-08-08 |
US20160325325A1 (en) | 2016-11-10 |
EA201690808A1 (ru) | 2016-10-31 |
BR112016010765B1 (pt) | 2022-08-02 |
MX2016008907A (es) | 2017-02-02 |
DE102014100107B4 (de) | 2016-11-17 |
US10239102B2 (en) | 2019-03-26 |
JP6603665B2 (ja) | 2019-11-06 |
JP2017508621A (ja) | 2017-03-30 |
EA031146B1 (ru) | 2018-11-30 |
DE102014100107A1 (de) | 2015-07-09 |
ES2674648T3 (es) | 2018-07-03 |
WO2015104244A1 (de) | 2015-07-16 |
AR098859A1 (es) | 2016-06-22 |
CN105848798B (zh) | 2018-03-30 |
CN105848798A (zh) | 2016-08-10 |
EP3092087A1 (de) | 2016-11-16 |
UA114864C2 (uk) | 2017-08-10 |
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