High strength high toughness steel
CA 1297320 C · Owner: Mostert, Roelof J. · Inventors: Mostert, Roelof J.; Badenhorst, Rudolf P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A relatively low cost, high strength high, toughness bar and sheet steel, which is substantially non-susceptible to the formation of delayed surface cracks in the as-rolled condition and its method of preparation are, provided, the constitution of the steel on a percentage mass to mass basis being as follows: C = 0, 21 - 0,28, Mn = 0, 80 - 1,80, Cr = 1 60 - 2,10, Si = 0, 35 maximum, Al = 0, 02 - 0,05 P and S each = 0, 025 maximum, Fe = the balance; the steel being characterised in that its composition is such that, upon air cooling following rolling, the transformation, temperature of the steel during the cooling is at a sufficiently high level to ensure that there is sufficient thermal …
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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 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 2009.
- 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.