Patents Assigned to Dalmine S.p.A.
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Publication number: 20240093323Abstract: A steel composition includes, in wt. %: C: 0.25-0.35; Si: 0.20-0.35; Mn: 0.40-0.60; Cr: 1.20-1.70; Ni: 1.40-1.90; Mo: 0.15-0.25; Al: 0.015-0.035; Nb: 0.001-0.040; V: 0.001-0.060; N: 0.0030-0.0120; Ca: 0.0010-0.0030; and Fe. The wrought article made from this composition has a balanced set of mechanical properties including strength, ductility and toughness including resistance to fatigue crack propagation.Type: ApplicationFiled: November 30, 2021Publication date: March 21, 2024Applicant: DALMINE S.P.A.Inventors: PAOLO BORTOT, MATTEO ORTOLANI, GIANLUCA BASSANINI, MICHELE SILEO, ERICK ARTURO ESCORZA MARQUEZ
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Patent number: 9657365Abstract: Disclosed herein are embodiments of a seamless quenched and tempered steel pipe which can have a wall thickness WT higher than or equal to 6 mm and lower than or equal to 35 mm. Some embodiments of the steel pipe can have a chemical composition comprising C, Mn, Si, Cr, Ni, Mo, Al, N, Ca, Nb, Ti, V, Zr, and Ta based on the composition weight, the remaining being iron and impurities. In some embodiments, wherein (V+Nb) content is lower than 0.07 wt %; defining a first parameter P1=(60×C)+Cr+[5×e(35×Mo/WT)]+50×(V+Nb), the chemical composition satisfies a first condition P1?14.5.Type: GrantFiled: April 8, 2014Date of Patent: May 23, 2017Assignee: DALMINE S.P.A.Inventors: Ettore Anelli, Emanuele Paravicini Bagliani, Stafano Fare, José Enrique Garcia Gonzalez, Victor Blancas Garcia, Héctor Manuel Quintanilla Carmona
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Patent number: 9644248Abstract: Disclosed herein are embodiments of a seamless quenched and tempered steel pipe having a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm. Embodiments of the steel pipe can comprise C, Mn, Cr, Ni, Mo, Al, Ca, N, Nb, Ti, Zr, and Ta. Further, for some embodiments of the steel pipe wherein, defining a first parameter P1=50×C+Cr+10×Mo+70×V, the chemical composition can satisfy a first condition P1?8.0.Type: GrantFiled: April 8, 2014Date of Patent: May 9, 2017Assignee: DALMINE S.P.A.Inventors: Ettore Anelli, Emanuele Paravicini Bagliani, Stefano Fare
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Patent number: 9598746Abstract: Low-alloy steels and methods of manufacturing pipes having a wall thickness greater than or equal to about 8 mm and less than or equal to about 35 mm therefrom are provided. In one embodiment, a steel composition is processed that yields an average prior austenite grain size greater than about 15 or 20 ?m and smaller than about 100 ?m. A quenching sequence has been determined that yields a microstructure of greater than or equal to about 60% martensite by volume, and less than or equal to about 40% by volume lower bainite, without substantial formation of ferrite, upper bainite, or granular bainite. The yield strength of the quenched and tempered pipes may be greater than about 70 ksi, 80 ksi, or 90 ksi. The quenched and tempered pipes are suitable for 70 ksi, 80 ksi, and 90 ksi grades and resistant to sulfide stress corrosion cracking.Type: GrantFiled: February 6, 2012Date of Patent: March 21, 2017Assignee: DALMINE S.P.A.Inventors: Ettore Anelli, Mariano Armengol, Paolo Novelli, Federico Tintori
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Publication number: 20140299236Abstract: Disclosed herein are embodiments of a seamless quenched and tempered steel pipe which can have a wall thickness WT higher than or equal to 6 mm and lower than or equal to 35 mm. Some embodiments of the steel pipe can have a chemical composition comprising C, Mn, Si, Cr, Ni, Mo, Al, N, Ca, Nb, Ti, V, Zr, and Ta based on the composition weight, the remaining being iron and impurities. In some embodiments, wherein (V+Nb) content is lower than 0.07 wt %; defining a first parameter P1=(60×C)+Cr+[5×e(35×Mo/WT)]+50×(V+Nb), the chemical composition satisfies a first condition P1?14.5.Type: ApplicationFiled: April 8, 2014Publication date: October 9, 2014Applicant: Dalmine S.p.A.Inventors: Ettore Anelli, Emanuele Paravicini Bagliani, Stefano Fare, José Enrique Garcia Gonzales, Victor Blancas Garcia, Héctor Manuel Quintanilla Carmona
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Publication number: 20140299235Abstract: Disclosed herein are embodiments of a seamless quenched and tempered steel pipe having a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm. Embodiments of the steel pipe can comprise C, Mn, Cr, Ni, Mo, Al, Ca, N, Nb, Ti, Zr, and Ta. Further, for some embodiments of the steel pipe wherein, defining a first parameter P1=50×C+Cr+10×Mo+70×V, the chemical composition can satisfy a first condition P1?8.0.Type: ApplicationFiled: April 8, 2014Publication date: October 9, 2014Applicant: Dalmine S.p.A.Inventors: Ettore Anelli, Emanuele Paravicini Bagliani, Stefano Fare
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Patent number: 8821653Abstract: Embodiments of the present disclosure comprise carbon steels and methods of manufacturing thick walled pipes (wall thickness greater than or equal to about 35 mm) there from. In one embodiment, a steel composition is processed that yields an average prior austenite grain size greater than about 15 or 20 ?m and smaller than about 100 ?m. Using this composition, a quenching sequence is provided that yields a microstructure of greater than or equal to about 50% by volume, and less than or equal to about 50% by volume, lower bainite, without substantial ferrite, upper bainite, or granular bainite. After quenching, pipes may be tempered. The quenched and tempered pipes may exhibit yield strengths greater than about 450 MPa (65 ksi) or 485 (70 ksi). Mechanical property measurements find the quenched and tempered pipes suitable for 450 MPa grade and 485 MPa grade, and resistance to sulfide stress corrosion cracking.Type: GrantFiled: February 6, 2012Date of Patent: September 2, 2014Assignee: Dalmine S.p.A.Inventors: Ettore Anelli, Mariano Armengol, Paolo Novelli, Federico Tintori
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Publication number: 20120204994Abstract: Embodiments of the present disclosure comprise carbon steels and methods of manufacturing thick walled pipes (wall thickness greater than or equal to about 35 mm) there from. In one embodiment, a steel composition is processed that yields an average prior austenite grain size greater than about 15 or 20 ?m and smaller than about 100 ?m. Using this composition, a quenching sequence is provided that yields a microstructure of greater than or equal to about 50% by volume, and less than or equal to about 50% by volume, lower bainite, without substantial ferrite, upper bainite, or granular bainite. After quenching, pipes may be tempered. The quenched and tempered pipes may exhibit yield strengths greater than about 450 MPa (65 ksi) or 485 (70 ksi). Mechanical property measurements find the quenched and tempered pipes suitable for 450 MPa grade and 485 MPa grade, and resistance to sulfide stress corrosion cracking.Type: ApplicationFiled: February 6, 2012Publication date: August 16, 2012Applicant: Dalmine S.P.A.Inventors: Ettore Anelli, Mariano Armengol, Paolo Novelli, Federico Tintori
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Publication number: 20120199255Abstract: Low-alloy steels and methods of manufacturing pipes having a wall thickness greater than or equal to about 8 mm and less than or equal to about 35 mm therefrom are provided. In one embodiment, a steel composition is processed that yields an average prior austenite grain size greater than about 15 or 20 ?m and smaller than about 100 ?m. A quenching sequence has been determined that yields a microstructure of greater than or equal to about 60% martensite by volume, and less than or equal to about 40% by volume lower bainite, without substantial formation of ferrite, upper bainite, or granular bainite. The yield strength of the quenched and tempered pipes may be greater than about 70 ksi, 80 ksi, or 90 ksi. The quenched and tempered pipes are suitable for 70 ksi, 80 ksi, and 90 ksi grades and resistant to sulfide stress corrosion cracking.Type: ApplicationFiled: February 6, 2012Publication date: August 9, 2012Applicant: DALMINE S.P.A.Inventors: Ettore Anelli, Mariano Armengol, Paolo Novelli, Federico Tintori
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Patent number: 8002910Abstract: The present invention pertains to steel with high mechanical resistance at room temperature and up to 130° C., good toughness and good corrosion resistance in the metal base as well as good resistance to cracking in the heat affected zones (HAZ) once the tubing is welded together, and more specifically to heavy gauge seamless steel tubing with high mechanical resistance, good toughness and good corrosion resistance called catenary conduit. The advantages of the present invention with respect to those of an the state of technology reside in providing a chemical composition for steel used to manufacture heavy gauge seamless steel tubing with high mechanical resistance, good toughness, good fissure resistance in the HAZ and good corrosion resistance and a process for manufacturing this product. These advantages are obtained by using a composition made up basically of Fe and a specific chemical composition.Type: GrantFiled: April 25, 2003Date of Patent: August 23, 2011Assignees: Tubos De Acero De Mexico S.A., Dalmine S.p.A.Inventors: Marco Mario Tivelli, Alfonso Izquierdo Garcia, Dionino Colleluori, Guiseppe Cumino
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Publication number: 20070089813Abstract: The present invention pertains to steel with high mechanical resistance at room temperature and up to 130° C., good toughness and good corrosion resistance in the metal base as well as good resistance to cracking in the heat affected zones (HAZ) once the tubing is welded together, and more specifically to heavy gauge seamless steel tubing with high mechanical resistance, good toughness and good corrosion resistance called catenary conduit. The advantages of the present invention with respect to those of an the state of technology reside in providing a chemical composition for steel used to manufacture heavy gauge seamless steel tubing with high mechanical resistance, good toughness, good fissure resistance in the HAZ and good corrosion resistance and a process for manufacturing this product. These advantages are obtained by using a composition made up basically of Fe and a specific chemical composition.Type: ApplicationFiled: April 25, 2003Publication date: April 26, 2007Applicants: Tubos De Acero Mexico S.A., Dalmine S.P.A.Inventors: Marco Tivelli, Alfonso Izquierdo Garcia, Dionino Colleluori, Guiseppe Cumino
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Patent number: 7066499Abstract: Pipe integral threaded joint formed by a male element (1) and a female element (2) respectively placed on the external surface and on the internal surface of two truncated cone-shaped parts of the threading (6, 7, 8, 9) having the same conicity value and being radially spaced, both being respectively divided by annular shoulders (5, 5?) which are parallel and orthogonal with respect to the pipe axis. They are provided two sealing surfaces (12, 12?, 13, 13?), one of them being cone-shaped and the other being spherical. After the screwing of the two elements (1, 2) said two annular shoulders (5, 5?) are in contact. Each male (1) and female (2) element comprises, respectively along its external and internal surface, a circumference cavity (14, 15) placed between a part of the threading and the annular shoulder (5, 5?) in order to allow the expansion of the lubricating fat.Type: GrantFiled: July 16, 2001Date of Patent: June 27, 2006Assignee: Dalmine S.p.A.Inventors: Giuseppe Della Pina, Giuseppe Rotini, Angelo Signorelli
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Patent number: 7014223Abstract: A flush-type integral threaded joint with truncated-cone threads, with two scaling surfaces 11?, 12?, 11?, 12?) set at the end of the threaded portions (7, 8), and with two annular scaling shoulders (5?, 6?, 5?, 6?). The two threaded portions (7, 8) of the male element (1) and female element (2), respectively, have the same value of conicity, and the two sealing surfaces (11?, 12?, 11?, 12?) are, in one case, conical or cylindrical, and in the other spherical. The threaded portion of each male and female element may have an end area with a thread that is not perfect.Type: GrantFiled: August 8, 2001Date of Patent: March 21, 2006Assignee: Dalmine S.p.A. (Italian Joint Stock Company)Inventors: Giuseppe Della Pina, Giuseppe Rotini, Angelo Signorelli
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Patent number: 5944921Abstract: A supermartensitic stainless steel having high mechanical strength and corrosion resistance showing the following percentage composition C.ltoreq.0.05; Cr 12-15; Ni 4-7; Mo 1.5-2; N 0.06-0.12; Mn 0.5-1; Cu<0.3; P<0.02; S.ltoreq.0.005; Al<0.02; Si.ltoreq.1; the rest being iron and minor impurities, with the further requirement that the percentages of Cr, Mo and N satisfy the following formula: (Cr+3.3 Mo+16 N).gtoreq.19. Said steel allows to obtain manufactured articles having excellent mechanical strength and corrosion resistance characteristics.Type: GrantFiled: November 11, 1997Date of Patent: August 31, 1999Assignee: Dalmine S.p.A.Inventors: Giuseppe Cumino, Massimo Barteri
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Patent number: 5538226Abstract: A pushing machine is described, which is capable of running to opposite directions, upon remote control, along a length of rail provided in front of the mouth or slag hole of an electric furnace (10) for the smelting of iron products. It shows, at the end of an arm (5, 5a) telescopically extensible and preferably pivoting to be able to swing also in the vertical plane, a head or front shield (6) mounted on a frame (1) which can be anchored to the ground and is slidable on rails by means of wheels (2, 2' . . . ), at least two of which are driving wheels. Said shield (6), having a size slightly smaller than the slag hole, has the function of keeping the scrap at the inside of the furnace during the charging operation and keeping the threshold free of the slag without any operator's intervention.Type: GrantFiled: March 17, 1995Date of Patent: July 23, 1996Assignee: Dalmine S.p.A.Inventor: Ugo della Foglia
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Patent number: 5352406Abstract: A properly balanced chemical composition and the choice of a heat treatment (annealing and quenching) under controlled conditions allow to obtain uperduplex stainless steel manufactures which, in the hot-worked form, are excellent in resistance to corrosion and have unit tensile yield strength at room temperature of 90 ksi min.Type: GrantFiled: April 23, 1993Date of Patent: October 4, 1994Assignees: Centro Sviluppo Materiali S.p.A., Dalmine S.p.A.Inventors: Massimo Barteri, Ivan Nembrini
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Patent number: 5109689Abstract: In an improved process for hot-rolling of seamless tubes with preliminary diameter reduction of the semifinished products (axially pierced round blanks), the coreless reduction step (without mandrel) occurs immediately before the step of continuous rolling on a mandrel and practically at the same time of driving the mandrel into the pierced blank, without interferences therebetween. The apparatus carrying out this operation is positioned immediately upstream of the continuous mill with mandrel, so as to form with this a single unit on the same line, thus reducing the need for room, the operation time and consequently the blank cooling before rolling, whereby the last stand of the rolling mill is reached at a sufficient temperature for rolling without any need of intermediate heating steps.Type: GrantFiled: November 27, 1990Date of Patent: May 5, 1992Assignee: Dalmine S.p.A.Inventor: Raimondo D'Avanzo
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Patent number: 3993482Abstract: A zinc based coating material useful for protecting ferrous surfaces against corrosion, also including magnesium, aluminum and chromium, wherein the percentage rato Mg/Al is between 1.5 and 5, the percentage ratio Cr/Mg is comprised between 0.03 and 0.2 and the amount of magnesium is between 1% and 5% by weight.Type: GrantFiled: January 8, 1975Date of Patent: November 23, 1976Assignee: Dalmine S.p.A.Inventor: Roberto Brunno