Method for manufacturing seamless tubulars using t-v-n microalloyed steels
CA 1340418 C · Owner: Yue, Stephen · Inventors: Yue, Stephen; Ruddle, George E.; Jonas, John J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing seamless steel tubes suitable for use as grades of casing and line pipe having yield strengths in excess of 70,000 psi without being heat, treated. Such steels are made of an alloy comprising by, weight, about 0.10% to 0.18% carbon about 1.0% to 2.0%, manganese, about 0.10% to 0.16% vanadium about 0.008% to, 0.012% titanium and about 150 parts per million to 220 parts per million nitrogen, the balance comprising iron and incidental impurities. The subject method comprises the steps of alloying a steel of the aforesaid chemical composition, forming the steel into a billet of steel reheating the billet in a reheating furnace passing the, billet through a piercing mill …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 2, 1999. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 2, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.