Patents by Inventor Ross McDowall Smith
Ross McDowall Smith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240076769Abstract: Red rust staining of Al/Zn coated steel strip in “acid rain” or “polluted” environments can be minimised by forming the coating as an Al—Zn—Si—Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in “acid rain” or “polluted” environments and corrosion at cut edges in marine environments can be minimised in Al—Zn—Si—Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg2Si phase particles of a particular morphology in interdendritic channels.Type: ApplicationFiled: August 8, 2023Publication date: March 7, 2024Applicant: Bluescope Steel LimitedInventors: Ross McDowall SMITH, Qiyang LIU, Bryan Andrew SHEDDEN, Aaron Kiffer NEUFELD, Joe WILLIAMS, David James NOLAN, Wayne RENSHAW
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Patent number: 11807941Abstract: Red rust staining of Al/Zn coated steel strip in “acid rain” or “polluted” environments can be minimised by forming the coating as an Al—Zn—Si—Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in “acid rain” or “polluted” environments and corrosion at cut edges in marine environments can be minimised in Al—Zn—Si—Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg2Si phase particles of a particular morphology in interdendritic channels.Type: GrantFiled: October 14, 2022Date of Patent: November 7, 2023Assignee: Bluescope Steel LimitedInventors: Ross McDowall Smith, Qiyang Liu, Bryan Andrew Shedden, Aaron Kiffer Neufeld, Joe Williams, David James Nolan, Wayne Renshaw
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Publication number: 20230349034Abstract: A method of forming a coating of a metal alloy on a steel strip to form a metal alloy coated steel strip is disclosed. The method includes a hot dip coating step of dipping steel strip into a bath of molten metal alloy and forming a metal alloy coating on exposed surfaces of the steel strip. A native oxide layer as defined herein forming on the metal alloy coating of the metal alloy coated strip emerging from the metal coating bath. The method includes controlling the method downstream of the hot dip coating step and/or selecting the metal coating composition to maintain the native oxide layer at least substantially intact on the metal alloy coating during the downstream steps.Type: ApplicationFiled: February 17, 2023Publication date: November 2, 2023Inventors: Aaron Kiffer Neufeld, Ross McDowall Smith, Qiyang Liu, Geoff Tapsell
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Publication number: 20230304122Abstract: A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the pH of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities.Type: ApplicationFiled: February 24, 2023Publication date: September 28, 2023Inventors: Wayne Andrew Renshaw, Aaron Kiffer Neufeld, Ross McDowall Smith, Geoff Tapsell
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Publication number: 20230279534Abstract: A steel strip that has a coating of an Al—Zn—Si alloy that contains 0.3-10 wt. % Mg and 0.005-0.2 wt. % V.Type: ApplicationFiled: February 22, 2023Publication date: September 7, 2023Inventors: Ross McDowall Smith, Qiyang Liu, Joe Williams, Aaron Kiffer Neufeld, Scott Robin Griffiths
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Publication number: 20230098046Abstract: Red rust staining of Al/Zn coated steel strip in “acid rain” or “polluted” environments can be minimised by forming the coating as an Al—Zn—Si—Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in “acid rain” or “polluted” environments and corrosion at cut edges in marine environments can be minimised in Al—Zn—Si—Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg2Si phase particles of a particular morphology in interdendritic channels.Type: ApplicationFiled: October 14, 2022Publication date: March 30, 2023Inventors: Ross McDowall Smith, Qiyang Liu, Bryan Andrew Shedden, Aaron Kiffer Neufeld, Joe Williams, David James Nolan, Wayne Renshaw
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Patent number: 11613792Abstract: A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the p H of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities.Type: GrantFiled: August 15, 2018Date of Patent: March 28, 2023Assignee: Bluescope Steel LimitedInventors: Wayne Andrew Renshaw, Aaron Kiffer Neufeld, Ross McDowall Smith, Geoff Tapsell
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Patent number: 11512377Abstract: Red rust staining of Al/Zn coated steel strip in “acid rain” or “polluted” environments can be minimised by forming the coating as an Al—Zn—Si—Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in “acid rain” or “polluted” environments and corrosion at cut edges in marine environments can be minimised in Al—Zn—Si—Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg2Si phase particles of a particular morphology in interdendritic channels.Type: GrantFiled: September 9, 2020Date of Patent: November 29, 2022Assignee: Bluescope Steel LimitedInventors: Ross McDowall Smith, Qiyang Liu, Bryan Andrew Shedden, Aaron Kiffer Neufeld, Joe Williams, David James Nolan, Wayne Renshaw
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Publication number: 20220025501Abstract: A steel strip that has a coating of an Al—Zn—Si alloy that contains 0.3-10 wt. % Mg and 0.005-0.2 wt. % V.Type: ApplicationFiled: August 4, 2021Publication date: January 27, 2022Inventors: Ross McDowall Smith, Qiyang Liu, Joe Williams, Aaron Kiffer Neufeld, Scott Robin Griffiths
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Publication number: 20210140026Abstract: Red rust staining of Al/Zn coated steel strip in “acid rain” or “polluted” environments can be minimised by forming the coating as an Al—Zn—Si—Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in “acid rain” or “polluted” environments and corrosion at cut edges in marine environments can be minimised in Al—Zn—Si—Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg2Si phase particles of a particular morphology in interdendritic channels.Type: ApplicationFiled: September 9, 2020Publication date: May 13, 2021Inventors: Ross McDowall Smith, Qiyang Liu, Bryan Andrew Shedden, Aaron Kiffer Neufeld, Joe Williams, David James Nolan, Wayne Renshaw
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Patent number: 10731241Abstract: An Al—Zn—Si—Mg alloy coated strip that has Mg2Si phase particles that are ?2 ?m and have a globular shape. A method of forming an Al—Zn—Si—Mg alloy coated strip comprises (a) heat treating a solidified coating to facilitate globularisation of Mg2Si phase particles in the coating and/or (b) changing the coating bath chemistry to form intermetallic compound phases that act as nucleation sites for Mg2Si phase particles with the result that small Mg2Si particles form on solidification of the coating.Type: GrantFiled: May 27, 2010Date of Patent: August 4, 2020Assignee: Bluescope Steel LimitedInventors: Ross McDowall Smith, Qiyang Liu, Joe Williams
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Publication number: 20200024717Abstract: A steel strip that has a coating of an Al—Zn—Si alloy that contains 0.3-10 wt. % Mg and 0.005-0.2 wt. % V.Type: ApplicationFiled: September 30, 2019Publication date: January 23, 2020Inventors: Ross McDowall Smith, Qiyang Liu, Joe Williams, Aaron Kiffer Neufeld, Scott Robin Griffiths
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Publication number: 20190106766Abstract: A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the p H of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities.Type: ApplicationFiled: August 15, 2018Publication date: April 11, 2019Inventors: Wayne Andrew Renshaw, Aaron Kiffer Neufeld, Ross McDowall Smith, Geoff Tapsell
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Publication number: 20190085438Abstract: A coating of an Al—Zn—Si—Mg alloy on a steel strip that is applied by a hot dip process and is subsequently heat treated to improve the ductility of the coating.Type: ApplicationFiled: November 15, 2018Publication date: March 21, 2019Inventors: Robert Ian Scott, Joe Williams, Ross McDowall Smith
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Patent number: 10233518Abstract: A steel strip having a coating of an aluminium-zinc-silicon alloy on at least one surface of the strip is disclosed. The strip is characterised in that the aluminium-zinc-silicon alloy contains less than 1.2 wt. % silicon and also contains magnesium. A method of forming a coating of an aluminium-zinc-silicon alloy on a steel strip is also disclosed. The method includes moving steel strip upwardly through a coating pot containing a bath of an aluminium-zinc-silicon alloy and having an opening in a bottom wall of the pot and forming a coating of the alloy on the strip. The method is characterized by minimizing residence time of steel strip in contact with the aluminium-zinc-silicon alloy bath in the pot.Type: GrantFiled: August 30, 2007Date of Patent: March 19, 2019Assignee: Bluescope Steel LimitedInventors: Qiyang Liu, Joe Williams, Ross McDowall Smith
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Publication number: 20190003030Abstract: A method of forming a coating of a metal alloy on a steel strip to form a metal alloy coated steel strip is disclosed. The method includes a hot dip coating step of dipping steel strip into a bath of molten metal alloy and forming a metal alloy coating on exposed surfaces of the steel strip. A native oxide layer as defined herein forming on the metal alloy coating of the metal alloy coated strip emerging from the metal coating bath. The method includes controlling the method downstream of the hot dip coating step and/or selecting the metal coating composition to maintain the native oxide layer at least substantially intact on the metal alloy coating during the downstream steps.Type: ApplicationFiled: September 7, 2018Publication date: January 3, 2019Inventors: Aaron Kiffer Neufeld, Ross McDowall Smith, Qiyang Liu, Geoff Tapsell
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Publication number: 20160168658Abstract: A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the pH of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities.Type: ApplicationFiled: October 17, 2013Publication date: June 16, 2016Inventors: Wayne Andrew Renshaw, Aaron Kiffer Neufeld, Ross McDowall Smith, Geoff Tapsell
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Patent number: 8475609Abstract: A method of treating an Al/Zn-based alloy coated product that includes an Al/Zn-based alloy coating on a substrate is disclosed. The method includes the steps of rapid intense heating of the alloy coating for a very short duration, and rapid cooling of the alloy coating, and forming a modified crystalline microstructure of the alloy coating.Type: GrantFiled: May 24, 2007Date of Patent: July 2, 2013Assignee: Bluescope Steel LimitedInventors: Qiyang Liu, Ross McDowall Smith, Bryan Andrew Shedden
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Publication number: 20130011693Abstract: A steel strip that has a coating of an Al—Zn—Si alloy that contains 0.3-10 wt. % Mg and 0.005-0.2 wt. % V.Type: ApplicationFiled: January 6, 2011Publication date: January 10, 2013Applicant: BLUESCOPE STEEL LIMITEDInventors: Ross McDowall Smith, Qiyang Liu, Joe Williams, Aaron Kiffer Neufeld, Scott Robin Griffiths
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Publication number: 20120135261Abstract: An Al—Zn—Si—Mg alloy coated strip that has Mg2Si phase particles that are?2 ?m and have a globular shape. A method of forming an Al—Zn—Si—Mg alloy coated strip comprises (a) heat treating a solidified coating to facilitate globularisation of Mg2Si phase particles in the coating and/or (b) changing the coating bath chemistry to form intermetallic compound phases that act as nucleation sites for Mg2Si phase particles with the result that small Mg2Si particles form on solidification of the coating.Type: ApplicationFiled: May 27, 2010Publication date: May 31, 2012Applicant: BLUESCOPE STEEL LIMITEDInventors: Ross McDowall Smith, Qiyang Liu, Joe Williams