Tenaris Connections Limited

Tenaris Connections B.v.

Nkk Tubes

Toshihiko Fukui

Tatsuo Ono

Alfonso Izquierdo Garcia

Motohisa Yoshida

Gustavo López Turconi

Nobuo Kobayashi

Hitoshi Iijima

Yusuke Minami

Tomoyuki Narikawa

Koji Sakura

Takeshi Kuwano

Nobuhide Sato

Gustavo Lopez Turconi

Disclosed herein are embodiments of a drill pipe tool joint and a drill pipe which are optimized for repeated make-up/break-out operations without the use of screw grease. Embodiments of the disclosure are environment friendly as well as having improved operating efficiency. In particular, the box and pin can be formed from different materials having different hardness.

Galling resistant drill pipe tool joint and corresponding drill pipe

Embodiments of the present application are directed towards steel compositions that provide improved properties under corrosive environments. Embodiments also relate to protection on the surface of the steel, reducing the permeation of hydrogen. Good process control, in terms of heat treatment working window and resistance to surface oxidation at rolling temperature, are further provided.

Steels for sour service environments

The present invention relates to an austenitic stainless steel tube for boiler, used for superheater or reheater in thermal power plant, giving excellent resistance to high temperature steam oxidation, in particular to an austenitic stainless steel tube containing 16 to 20% Cr by weight, and being cold-worked at the inner surface of the tube. The Cr concentration in the vicinity of the inner surface of the steel tube is 14% by weight or larger, and the hardness at 100 &#x3bc;m depth from the inner surface of the steel tube is 1.5 times or larger the average hardness of the mother material or is HV 300 or larger.

Austenitic stainless steel tube for boiler with excellent resistance to high temperature steam oxidation

Growing community of inventors

Kawasaki, Japan

Toshihiko Fukui