Line pipe steels and process of manufacturing

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9493864
APP PUB NO 20140261915A1
SERIAL NO

14210624

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Abstract

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A process for producing high strength steel is provided. The process includes providing a steel slab having a chemical composition in weight percent within a range of 0.025-0.07 C, 1.20-1.70 Mn, 0.050-0.085 Nb, 0.022 max Ti, 0.065 max N, 0.0040 max S, 0.10-0.45 Si, 0.070 max P, with the balance being Fe and incidental impurities. The steel slab is soaked within a temperature range of 1150-1230° C., hot rolled using a roughing treatment in order to produce a transfer bar and further hot rolled using a finishing treatment in order to produce hot rolled strip. The hot rolled strip is cooled using a cooling rate between 10-100° C./second (sec) and coiled within a temperature range of 580-400° C. Finally, the coiled hot rolled strip has a yield strength of at least 80 ksi and a DWTT transition temperature equal or less than −20° C.

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Patent Owner(s)

  • AM/NS CALVERT LLC

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bevans, Stanley Wayne S.W. Decatur, US 11 12
Ehrhardt, Bertram Wilhelm Mobile, US 13 14
Forsch, Markus Wilhelm S. Mobile, US 2 1
Jamwal, Ranbir Singh Mobile, US 6 13
McGloin, Gerald Saraland, US 1 1
Samuel, Chris John Paul Mobile, US 7 3
Schonenberg, Rudolf Calvert, US 2 3

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