EP2069549A1 - Steel preferably suitable for making shells of caster rolls for aluminium and its alloys and relevant heat treatment - Google Patents
Steel preferably suitable for making shells of caster rolls for aluminium and its alloys and relevant heat treatmentInfo
- Publication number
- EP2069549A1 EP2069549A1 EP07804899A EP07804899A EP2069549A1 EP 2069549 A1 EP2069549 A1 EP 2069549A1 EP 07804899 A EP07804899 A EP 07804899A EP 07804899 A EP07804899 A EP 07804899A EP 2069549 A1 EP2069549 A1 EP 2069549A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- percentage
- shell
- heat treatment
- exceeding
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 title claims description 25
- 239000000956 alloy Substances 0.000 title claims description 25
- 239000004411 aluminium Substances 0.000 title claims description 10
- 229910052782 aluminium Inorganic materials 0.000 title claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 17
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 16
- 239000010937 tungsten Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 15
- 239000011651 chromium Substances 0.000 claims description 12
- 239000011572 manganese Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 10
- 229910017052 cobalt Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000010941 cobalt Substances 0.000 claims description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000011282 treatment Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000005864 Sulphur Substances 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052785 arsenic Inorganic materials 0.000 claims description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 150000002431 hydrogen Chemical class 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000008901 benefit Effects 0.000 description 7
- 238000005266 casting Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0648—Casting surfaces
- B22D11/0651—Casting wheels
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C22C38/40—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
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
Definitions
- the invention concerns a steel particularly suitable for making shells for rolling mills used in continuous casting systems, as well as a improved heat treatment.
- the molten material coming from a continuous casting passes between two opposite and properly spaced revolving rolls.
- Each roll comprises a central element, called “core”, and an external element, called “shell”, which defines the surface directly in contact with the molten metal.
- the core comprises a cylindrical body provided with channels for the passage of a cooling fluid and equipped with mechanical members for coupling with a corresponding powered shaft.
- the external element, called shell consists of a cylindrical body made of steel provided with an axial through hole suited to house the core through an interference fitting process.
- the molten metal coming from the casting is conveyed towards the pair of rolls and uniformly distributed on the surface of the lower roll that causes it to solidify owing to its low surface temperature.
- the rolls which rotate in the direction of advance of the molten metal, roll the solidified metal layer and produce a thin sheet.
- the roll shell comes into contact with the molten aluminium, its surface temperature rapidly increases. Inside, on the other hand, the temperature is much lower due to the cooling effect resulting from the heat exchange with the cooling liquid of the core.
- the portion of surface metal of the shell in contact with the liquid metal moves away from the metal itself, its temperature rapidly decreases and causes a volume contraction.
- the shell suffers cracks due to thermal stress that reach critical dimensions after a given number of working hours. Once created, these cracks propagate in depth as processing continues, so that they negatively affect both the quality of the final product and the fatigue resistance of the shell itself, thus making it necessary to replace the shell or to grind the surface of the rolls.
- the shell After a given number of grinding operations, however, it is necessary to replace the shell, which becomes unusable due to its reduced thickness deriving from the processing and from the previous grinding operations. Generally, the shell is replaced when its thickness is half the original thickness and the following operations are required: removal of the shell from the core, grinding of the core surface and thermal fitting of a new shell.
- the material of which the shell is made therefore, is of fundamental importance for the duration of the shell, in terms of operating hours and tons produced, and also in view of the need to obtain a shell with good surface finishing and suitable characteristics.
- the shell in fact, besides extracting heat from the molten metal in order to cause it to solidify and produce good quality rolled sections, must have suitable mechanical characteristics to resist the tensile thermal stress due to the fitting operations and to compression-rotation during use.
- the shell must feature considerable thermal fatigue resistance, low thermal expansion coefficient, high thermal conductivity, high yield point at high temperatures, as well as high ductility and toughness at high temperatures, the latter being very useful for delaying propagation of cracks due to thermal fatigue once they have appeared.
- the known technique has proposed various materials that aimed to improve one of these characteristics but worsened at least one of the remaining characteristics.
- some solutions pay special attention to the high resistance of the material, reducing on the other hand the toughness and ductility of the same.
- the object of the present invention is to overcome the drawbacks described above.
- a steel advantageously but not exclusively for rolling mills and/or continuous casting rolls that, according to the contents of the main claim, is characterized in that it comprises a variable percentage - in weight - alloyed with iron Fe: C from 0.48% to 0.60%, Mn from
- the proposed steel has elements that generate impurities up to a maximum of approx 0.010% per element.
- the proposed solution advantageously makes it possible to obtain a material with particular characteristics as to resistance and stability to high temperatures, also thanks to the introduction of tungsten contents (W) as will be described in greater detail below.
- the alloy obtained presents an increased yield point at high temperatures compared to the steels of known type.
- the alloy contains cobalt Co.
- the solution proposed allows satisfying toughness values to be maintained.
- the proposed alloy presents greater resistance to tempering due to high operating temperatures compared to the known steels.
- Figure 2 shows an axonometric exploded view of one of the rolls of Figure l;
- Figure 3 shows a schematic side view of a pair of rolls for continuous casting during operation.
- the proposed steel substantially comprises, a variable percentage - in weight - alloyed with iron Fe: carbon C from 0.48% to 0.60%, manganese Mn from 0.45% to 0.60%, silicon Si from 0.30% to 0.60%, nickel Ni from 0.40% to 0.60%, chromium Cr from 1.80% to 2.50%, molybdenum Mo from 0.80% to 1.10%, vanadium V from 0.30% to 0.50%, tungsten W from 0.30% to 0.70%.
- a group of preferred steels which comprise a variable percentage - in weight - alloyed with iron Fe: carbon C from 0.52% to 0.57%, manganese Mn from 0.45% to 0.60%, silicium Si from 0.30% to 0.40%, nickel Ni from 0.45% to 0.60%, chromium Cr from 1.90% to 2.40%, molybdenum Mo from 0.85% to 1.0%, vanadium V from 0.33% to 0.37%, tungsten W from 0.30% to 0.40%.
- a preferred combination of elements has been identified, which presents an excellent and advantageous combination of mechanical properties.
- This steel comprises a percentage - in weight - alloyed with iron Fe: 0.52% of carbon C, 0.48% of manganese Mn, 0.33% of silicium Si, 0.46% of nickel Ni, 2.16% of chromium Cr, 0.94% of molybdenum Mo, 0.35% of vanadium V and 0.31% of tungsten W.
- tungsten W must be introduced in the steel, being characterized by good solubility in ferrite and a marked tendency to form highly stable carbon, in significant percentages.
- the advantageous multiplying effect achieved with the proposed solution makes it possible to amplify the improved metallurgic effect of some chemical elements, each having the effect to improve some characteristics of the alloy. More particularly, in this specific case this effect makes it possible to increase the tempering temperature so that it approaches the operating temperature, introducing the above mentioned elements in the alloy in quantities that are smaller than those that should be introduced if, to obtain the same effect, they were added individually. In other words, the improvement of some characteristics, obtained with a single element in high percentages, in the proposed solution is obtained more effectively through the addition of more elements, in lower percentages than those used for individual elements. More particularly, in the example described herein, the addition of tungsten W and molybdenum Mo increases the tempering temperature so that it approaches the operating temperature.
- the total impurities present in the alloy preferably do not exceed 0.60% in percentage weight.
- Impurities are all those elements introduced in the alloy that produce undesired effects on the characteristics of the product. These impurities include the following elements: phosphorus P in percentages not exceeding 0.010%, sulphur S in percentages not exceeding 0.010%, titanium Ti in percentages not exceeding 0.010%, tin Sn in percentages not exceeding 0.018%, aluminium Al in percentages not exceeding 0.018%, copper Cu in percentages not exceeding 0.25%, hydrogen H 2 up to a maximum of approximately 1.8 ppm, arsenic As in percentages not exceeding 0.007%.
- said impurities are present in the following percentage values: phosphorus P 0.008%, sulphur S 0.004%, titanium Ti 0.0 %, tin Sn 0.005%, aluminium Al 0.009%, copper Cu 0.25%, hydrogen H 2 1.64 ppm, arsenic As in percentages not exceeding 0.007%.
- a heat process has been identified, which makes it possible to improve the mechanical characteristics both of the steel having the proposed composition and of the alloys and steels having known compositions.
- the heat process of the invention includes, in addition to hardening, a tempering process at a temperature included between 550 0 C and 660 0 C and preferably at 600 0 C.
- Hardening is preferably carried out at a temperature included between 870 0 C and 990 0 C and more particularly between 870 0 C and 970 0 C and preferably at 950 0 C.
- Advantageous results have been achieved by carrying out hardening with water quenching solution, that is, using mixtures of water and oil in suitable percentages.
- the compositions of a series of castings carried out according to the invention are listed in TABLE 1, where they are identified by letters Bl, B2 and B3, compared with an example of alloy of known type, indicated by Xl, X2, Yl, Y2, Y3 and Z.
- TABLE 2 to be found here below indicates the mechanical characteristics, at a high temperature, of the above mentioned castings.
- table 2 shows, for each casting, test temperature in 0 C, ultimate strength (Rm) expressed in Mpa, yield strength 0.2% (Rp 0.2) expressed in Mpa, percentage elongation after breakage (A%), percentage contraction after breakage (Z%).
- the proposed solution thus advantageously allows a material with particular resistance and stability to high temperatures to be obtained.
- the iron alloy comprises also a percentage of cobalt, variable in weight between 0.15 and
- the cobalt present in the alloy advantageously makes it possible to increase resistance to softening at high temperatures, thus contributing, together with tungsten, to increasing the tempering temperature and improving the resistance of the shell to high operating temperatures.
- the hardening temperature is preferably included between 870 0 C and 1000 0 C and more particularly between 980 0 C and 990 0 C.
- An example of embodiment of a caster roll that is also the subject of the invention is represented in Figures 1, 2 and 3, where it is indicated as a whole by
- the roll 1 has a working surface 2 made with steel produced according to the invention.
- the roll 1 comprises, as visible in detail in Figure
- the core 3 comprises a substantially cylindrical body provided with channels for the passage of a cooling fluid, only the inlet hole 31 thereof being visible, and is provided with equipment for coupling with a corresponding powered shaft.
- the shell 4 comprises, in this case, a cylindrical body 41, visible also in Figure 2, completely made with a steel produced according to the invention, and provided with an axial through hole 5 suited to house the core 3 via an interference fitting process.
- Figure 3 schematically shows a process for producing a metal strip, where the molten metal 10 coming from the casting is conveyed towards the pair of rolls 1 that rotate in a direction corresponding to the advance direction of the molten metal 10, thus making it solidify.
- the molten metal 10 in contact with the surfaces 2 of each roll 1 solidifies forming two separate parts that are joined at the level of the bottleneck 11 defined by the rolls 1 themselves and forming a foil 12 between the two rolls 1 in the area 11.
- the proposed alloys have tempering temperatures that even exceed 600 0 C, thus also considerably improving resistance to crack propagation (Kic).
- Kic resistance to crack propagation
- experimental tests have also shown that the proposed steel has good toughness to the operating temperature of the shells and this ensures higher resistance to the propagation of cracks after their inevitable appearance over time.
- Experimental tests have also shown that the proposed alloys advantageously offer a good compromise between resistance (Rm - Rp0.2 - HB) and toughness (KV) or resilience.
- the alloy obtained presents an increase in the yield point at high temperatures compared to the reference steels.
- the rolls for continuous casting and/or of the shells for said rolls, made with the proposed steel it has been possible to verify experimentally that their yield point at operating temperature is higher than that of known steels, which advantageously delays the appearance of cracks. This advantageously ensures a longer average life of said rolls and/or shells compared to that of the known rolls and/or shells. This makes it also possible, to advantage, to reduce the manufacturing cost of rolled products, and also to obtain better surface quality of the same.
Landscapes
- 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)
- Heat Treatment Of Articles (AREA)
- Metal Rolling (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000273A ITVI20060273A1 (en) | 2006-09-07 | 2006-09-07 | STAINLESS STEEL PREFERIBLY FOR THE IMPLEMENTATION OF COATINGS (SHIRTS) OF CASTING ROLLERS FOR ALUMINUM AND ITS ALLOYS AND RELATED THERMAL TREATMENT |
PCT/IB2007/002600 WO2008029268A1 (en) | 2006-09-07 | 2007-09-03 | Steel preferably suitable for making shells of caster rolls for aluminium and its alloys and relevant heat treatment |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2069549A1 true EP2069549A1 (en) | 2009-06-17 |
EP2069549B1 EP2069549B1 (en) | 2012-03-21 |
Family
ID=38658422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07804899A Not-in-force EP2069549B1 (en) | 2006-09-07 | 2007-09-03 | Steel preferably suitable for making shells of caster rolls for aluminium and its alloys and relevant heat treatment |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2069549B1 (en) |
AT (1) | ATE550449T1 (en) |
IT (1) | ITVI20060273A1 (en) |
WO (1) | WO2008029268A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1025680A (en) * | 1962-12-31 | 1966-04-14 | Kanto Tokushu Seiko Kabushiki | Improvements in or relating to steel rolls |
AT313950B (en) * | 1969-05-02 | 1974-03-11 | Voest Ag | Steel for rollers and cylinders |
BE764039A (en) * | 1970-03-18 | 1971-08-02 | Krupp Ag Huettenwerke | SHEEP FOR FORGING HAMMERS AND PROCESS FOR MAKING THE SHEEP |
JPS5782458A (en) * | 1980-11-07 | 1982-05-22 | Hitachi Metals Ltd | High toughness tool steel for hot working |
US4409027A (en) * | 1982-06-28 | 1983-10-11 | Armco Inc. | Alloy steel for roll caster shell |
FR2578768B1 (en) * | 1985-03-15 | 1988-05-06 | C3F Comp Franc Forges Fond | CONTINUOUS CASTING ROLLER BRAKES |
US4772451A (en) * | 1987-09-30 | 1988-09-20 | Earle M. Jorgensen Co. | Low alloy steel for caster shell applications |
PL154380B1 (en) * | 1988-05-25 | 1991-08-30 | Inst Metallurgii Zeleza Imeni | Alloy tool steel |
JP2833374B2 (en) * | 1992-09-16 | 1998-12-09 | 関東特殊製鋼株式会社 | Low hardness, long life rolling fatigue strength quenched roll steel |
JP2953304B2 (en) * | 1994-05-18 | 1999-09-27 | 関東特殊製鋼株式会社 | Roll outer tube material for continuous sheet casting machine |
-
2006
- 2006-09-07 IT IT000273A patent/ITVI20060273A1/en unknown
-
2007
- 2007-09-03 EP EP07804899A patent/EP2069549B1/en not_active Not-in-force
- 2007-09-03 WO PCT/IB2007/002600 patent/WO2008029268A1/en active Application Filing
- 2007-09-03 AT AT07804899T patent/ATE550449T1/en active
Non-Patent Citations (1)
Title |
---|
See references of WO2008029268A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE550449T1 (en) | 2012-04-15 |
WO2008029268A1 (en) | 2008-03-13 |
EP2069549B1 (en) | 2012-03-21 |
ITVI20060273A1 (en) | 2008-03-08 |
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