Patent · US Active

Low-alloy steel having a high yield strength and a high sulphide-induced stress cracking resistance

US9273383B2 · kind B2 · utility

1Cited by

1References

13Claims

0Family size

Assignee

VALLOUREC OIL AND GAS FRANCE · FR

Inventors

Laurent Delattre · Saint-Saulve, FR
Herve Marchebois · Valenciennes, FR
Michel Piette · Keyano, CA
Christoph Bosch · Dortmund, DE
Michaela Hoerstemeier · Goldkronach, DE
Joachim Konrad · Goldkronach, DE

Key dates

Filing date	May 19, 2011
Grant date	Mar 1, 2016
Priority date	—
Expiry date	Apr 7, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC22C38/24
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A steel contains, by weight: C: 0.3% to 0.5%, Si: 0.1% to 0.5%, Mn: 1% or less, P: 0.03% or less, S: 0.005% or less, Cr: 0.3% to 1%, Mo: 1% to 2%, W: 0.3% to 1%, V: 0.03% to 0.25%, Nb: 0.01% to 0.15%, Al: 0.01% to 0.1%, the remainder of the chemical composition of the steel being constituted by Fe and impurities or residuals resulting from or necessary to steel production and casting processes. The steel can be used to produce seamless tubes for hydrocarbon wells with a yield strength after heat treatment of 862 MPa or more or even 965 MPa or more.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.