Sumitomo Metal Industries, Inc.

Nippon Steel Sumitomo Metal Corporation

Carl Mahr Holding Gmbh

Mutsumi Tanida

Nobuyuki Mori

Keiichi Nakamura

Yasuhisa Kasa

Tetsuya Nakanishi

Takashi Matsuura

Tatsuro Honda

Seiji Hiraoka

Masami Sakiyama

Shigeru Kidani

Konrad Friedrich

Masayuki Yoshida

Erhard Gruener

Hiroki Kusuda

Tadayoshi Fujisaka

Hisao Yamasaki

A first thread feature is measured by detecting with an optical sensorlight that reaches from a light sourcelocated on the opposite side of a pipe axis and runs substantially in parallel to thread grooves A. A contact probeof a contact sensoris contacted with a thread flank surface Ato detect the space coordinates of the contact probeat the time of contact, so that a second thread feature is measured. The first and second thread features thus detected are combined with each other by a processor, and thread features of the thread provided as a measurement object are thereby calculated.

Apparatus, system, and method for measuring thread features on pipe or tube end

A two-dimensional code reading deviceis provided with image pickup devicewhich receives light reflected from either of a first inclined portionand a second inclined portionin a direction forming an angle &#x3b8; satisfying expression (1) with respect to the normal-line direction R, and light sourcewhich irradiates either of the inclined portions from a direction forming an angle &#x3b1; satisfying expression (2) with respect to the normal-line direction R:30&#xb0;&#x2266;&#x3b8;&#x2266;35&#xb0;&#x2003;&#x2003;(1)&#x394;&#x3b8;=&#x3b8;&#x2212;180&#xb0;+&#x3b1;+2&#x3b2;&#x2003;&#x2003;(2)where &#x3b2; is less than 90&#xb0;,

Two-dimensional code reading device, two-dimensional code reading method, method of controlling manufacturing history information of member having substantially circular section orthogonal to the central axis thereof, and method of manufacturing the member using the control method

A dimension measuring devicein accordance with the present invention includes an end face following mechanismthat butts against an end face E of a long material, a dimension measuring mechanismfor measuring the dimensions of the long material, and a pushingly moving mechanismfor pushingly moving the end face following mechanism toward the end face of the long material. The end face following mechanism includes a plurality of contact sensors for detecting a contact state, and is turnable around two axes intersecting at right angles with each other. The pushingly moving mechanism pushingly moves the end face following mechanism into the state in which the plurality of contact sensors detect that the end face following mechanism butts against the end face of the long material. The dimension measuring mechanism is pushingly moved integrally and is turnable integrally with the end face following mechanism, and measures the dimensions of the long material when it is detected, by the plurality of contact sensors, that the end face following mechanism butts against the end face of the long material.

Dimension measuring device for long material

A martensitic stainless steel pipe, which comprises specified quantities of C, Si, Mn, P, S, Cr, Ni, Al, N, Cu, Ti, V, Mo, Nb, B and Ca, and the balance being Fe and impurities, has satisfactory toughness at a high strength of 650 MPa or more by yield strength and also excellent hot workability. Therefore, it can be used as a high-strength martensitic stainless steel pipe for carbon dioxide gas corrosion resistant use, to be used in oil and/or gas well environments containing no hydrogen sulfide but carbon dioxide gas. This high-strength martensitic stainless steel pipe is an inexpensive martensitic stainless steel pipe, which does not require an addition of large quantities of expensive elements such as Ni and Mo, and moreover does not require the control of the content of P to a value less than 0.010% by mass.

Method for producing martensitic stainless steel pipe

The production history information management apparatuscomprises: machining an identifier for identifying a pipe or tube in a region of the pipe or tube on which thread cutting is to be performed before an initial production process is performed among production processes which are management targets of the production history information; reading the identifier machined on the pipe or tube before each of the production processes is performed or while each of the production processes is performed; management for storing the production history information of the pipe or tube obtained in each of the production processes and the identifier read from the pipe or tube while the production history information and the identifier are associated with each other; and thread cutting for removing the identifier machined on the pipe or tube in the process of performing the thread cutting on the end portions of the pipe or tube among the production processes which are management targets of the production history information.

Method and apparatus for managing production history information of pipe or tube and method for producing pipe or tube therewith

This invention relates to a method of manufacturing a martensitic stainless steel. The method comprises the following steps (a) to (c): The steel could further contain 0.2 to 0.3 % of Mo.

Method of manufacturing a martensitic stainless steel

The present invention provides a martensitic stainless steel seamless pipe and a method of making, wherein the pipe has minimal inner surface defects and prevents delayed fracture generation in the impact-worked portions. The pipe comprises C: 0.15 to 0.22%, Si: 0.1 to 1.0%, Mn: 0.10 to 1.00%, Cr: 12.00 to 14.00%, P: 0.020% or less, S: 0.010% or less, N: 0.05% or less, O(Oxygen): 0.0060% or less, at least one alloying element selected from V, Nb and Ti of 0.005 to 0.200% and B of 0.0005 to 0.0100%, and the balance Fe and impurities, wherein either the following inequalities (1), (2), (4) and (5) or the following inequalities (1), (3), (4) and (5) are satisfied:C*+10N*&#x2266;0.45,&#x2003;&#x2003;(1)H1&#x2266;&#x2212;0.003(C*+10N*)+0.0016,&#x2003;&#x2003;(2)H2&#x2266;&#x2212;0.0018(C*+10N*)+0.00096,&#x2003;&#x2003;(3)Cr*&#x2266;9.0,&#x2003;&#x2003;(4)S&#x2266;0.088N*+0.00056,&#x2003;&#x2003;(5).

Martensitic stainless steel seamless pipe and a manufacturing method thereof

In a martensitic stainless steel tube according to the present invention, the content is determined by each of elements C, Si, Mn and Cr, and the bubble content ratio is further prescribed in accordance with the scale thickness on the outer surface of the steel tube, so that defects can be detected with high precision in the non-destructive inspection, such as ultrasonic test or the like. This allows the non-destructive inspection to be carried out with high efficiency. Moreover, there is another advantage that the weather resistance can be enhanced. The steel tube according to the present invention and the manufacturing method thereof can be suitably used in all of the technical fields in which a martensitic stainless steel tube having equal chemical composition is treated.

Method for manufacturing martensitic stainless steel tube

Martensitic stainless steel pipe

Martensitic stainless steel whose steel composition is restricted within a specific range for each element is provided. The scale layer formed on the surface of the base material consists of an inner layer scale mainly including FeCrOand an outer layer scale having a thickness of not more than 20 &#x3bc;m, which outer layer is deposited on the inner layer scale at a surface coverage of not less than 1% and not more than 15%. The application of rust preventive oil onto the surface of the steel ensures an excellent weather resistance during a long term, and therefore a martensitic stainless steel forming no rust either in the outdoor depository or in the indoor depository can be provided. The steel can be used to manufacture, not only steel pipes, but also steel plates, steel rods and others in a wide application field.

Martensitic stainless steel and method for manufacturing the same

A martensitic stainless steel for seamless steel pipes, excellent in descaling property and machinability, having the following chemical composition, by weight %; 0.025 to 0.22% of C, 10.5 to 14% of Cr, 0.16 to 1.0% of Si, 0.05 to 1.0% of Mn, 0.05% or less of Al, 0.100% or less of N, 0.25% or less of V, 0.020% or less of P, 0.004 to 0.015% of S, and the balance Fe and impurities, This steel may include 0.0002 to 0.0050% of B, and/or 0.0005 to 0.005% of Ca. In this case, the upper limit of S may be extended up to 0.018%. Preferably, Al is limited to less than 0.01%.

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Wakayama, Japan

Mutsumi Tanida