Jfe Steel Corporation

Toyo Drilube Co., Ltd.

Seigo Goto

Takamasa Kawai

Yasuhide Ishiguro

Masaki Yoshikawa

Seiji Ozaki

Hideo Sato

Akira Okubo

Tatsuro Katsumura

Tsuyoshi Yoneyama

Ryota Kobayashi

Koichi Shoda

Takashi Koga

Ryota Kubo

Kota Toyosawa

Sachiko Fujimoto

Hiroki Ota

Shunsuke Sasaki

Masao Yuga

Takuya Nagahama

Hideo Kijima

Kazuki Fujimura

Jun Takano

Taro Kanayama

An agent for forming a solid lubricating coating film on a tightening surface of a thread portion, in which a solid lubricant is dispersed in a binder resin as a matrix component, a main component of the solid lubricant is melamine cyanurate, and an average particle diameter of the melamine cyanurate is 0.1 μm or more and 10.0 μm or less, the binder resin contains an alkyd resin and nitrocellulose, and the alkyd resin and nitrocellulose are contained in an amount of 85 wt % or more of the total binder resin component weight, and a total weight of the solid lubricant is 10 parts by weight or more and 100 parts by weight or less based on 100 parts by weight of a total weight of the binder resin.

Agent, oil country tubular goods, and threaded joint for oil country tubular goods

A solid lubricating coating film capable of imparting favorable lubricity and corrosion resistance to a connection for oil country tubular goods. Two or more solid lubricants are dispersed in a binder resin. Graphite is contained in an amount of 50% or more and 90% or less of a total weight of the solid lubricants, and the graphite has a scaly shape and an average particle diameter of 10.0 μm or less. A solid lubricant made of one or more materials selected from BN, mica, talc, MCA, MoS, PTFE, PFA, and FEP is further contained as other solid lubricants of the two or more types of solid lubricants. The binder resin contains a PEEK resin having an average particle diameter of 20 μm or less as a main component, and the PEEK resin is contained in an amount of 70% or more of a total weight of the binder resin.

Agent for forming solid lubricating coating film, oil country tubular goods, threaded joint for oil country tubular goods, and method for manufacturing oil country tubular goods

A threaded joint wherein a relationship between shoulder angle parameters and thread taper angle parameters for a coupling and a pair of pins inserted from both ends of the coupling is defined by the following expression (1), and a tightening torque with which the threaded joint is tightened is 60% or more and 85% or less of a yield torque determined by the following expression (2):

Threaded joint of pipe and method for connecting same

To prevent fracture of a box under a tensile load without increasing the outer diameter of the box. The presently disclosed threaded joint for pipes includes a pin provided with a male thread portion at one end of a first pipe, and a box provided with a female thread portion at one end of a second pipe, where each of a plurality of thread grooves of the female thread portion has a corner portion on a load flank side and a corner portion on a stabbing flank side on a thread bottom side, a corner portion on a load flank side of a first thread groove includes a first arc portion that has a first curvature radius, and a second arc portion that has a second curvature radius, and a ratio of the second curvature radius to the first curvature radius is 3 or more.

Threaded joint for pipes

A threaded joint with excellent tensile strength, comprising: a pin having an externally threaded part comprising a first and second externally threaded sections across a step on an outer periphery on a distal-end side of a first steel pipe or tube; and a box having an internally threaded part comprising a first and second internally threaded sections across the step on an inner periphery on a distal-end side of a second steel pipe or tube, the externally threaded part being screwed to the internally threaded part to join the pin and the box. The threaded joint has a first and second thread sequence with lengths Land Lrespectively, and cross-sectional areas PPBand Bat end positions 4, 5, 6, and 7, respectively, satisfying Formulas (1) and (2): (PB)&#x2264;P{L/(L+L)}(1) and (PB)&#x2264;B/{L/(L+L)}(2), where (PB)represents Por Bwhichever is smaller.

Threaded joint

A method of manufacturing a seamless stainless steel pipe for Oil Country Tubular Goods by heating a billet having a specified chemical composition including forming the billet into a seamless steel pipe by applying hot working to the billet, cooling the seamless steel pipe to a room temperature at a cooling rate of air cooling or more, thereafter, performing quenching by heating the seamless steel pipe to a temperature of 850&#xb0; C. or above, subsequently, cooling the seamless steel pipe to a temperature of 100&#xb0; C. or below at a cooling rate of air cooling or more, and subsequently, applying tempering to the seamless steel pipe at a temperature of 700&#xb0; C. or below for a specific holding time.

Seamless stainless steel pipe for oil country tubular goods and method of manufacturing the same

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Tokyo, Japan

Seigo Goto