Clamp and method for high-temperature tensile detection of small-specification metal tubular product

Abstract

The invention, which belongs to the field of detection of physicochemical mechanical properties of metal materials, particularly relates to a clamp and method for high-temperature tensile detection ofa small-specification metal tubular product. The clamp comprises a casing pipe, a clamping cone, a tip cone, plugs and a connecting rod. A conical opening is formed in one end inside the casing pipeand an internal thread is formed at the other end. The clamping cone is in a shape like a circular truncated cone; and threaded holes are formed in the clamping cone. An external thread is arranged atthe tip cone. The plugs are used for being inserted into two ends of a metal pipe and supporting the pipe wall; and the two ends of the metal pipe are arranged in the threaded holes of the clamping cone respectively; the clamping tone is arranged in the conical opening in the casing pipe; the tip cone is screwed into the casing pipe to compress the clamping cone to clamp the metal pipe; and the tip cone is connected with a testing machine by the connecting rod. According to the invention, the clamp can be operated simply with great convenience and high durability; the metal pipe high-temperature performance index meeting the actual working condition can be obtained; the control precision of the detection temperature can be improved; the one-time success rate of detection can be increased;and the detection period can be shortened.

Description

technical field [0001] The invention belongs to the field of detection of physical, chemical and mechanical properties of metal materials, and in particular relates to a fixture and a method suitable for high-temperature tensile detection of small-sized metal pipes. Background technique [0002] At present, domestic high-temperature tensile tests for pipes are carried out in accordance with "HB 5211-1982 High-temperature Tensile Test Method for Metal Pipes" and "GB / T 4338-2006 High-temperature Tensile Test Method for Metal Materials", and the working range is 100℃~ 900°C, it is stipulated that when the outer diameter of the pipe is equal to or less than 16mm, the whole pipe should be cut for the test. For the pipe with the outer diameter greater than 16 to 30mm, if the test conditions are available, the whole pipe should also be selected for the test, otherwise it can be cut. A strip sample with a width of 10 mm was tested. Since there are not many high-temperature tensile ...

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Problems solved by technology

Due to the fact that there are not many high-temperature tensile tests for integral pipes in China, the test methods are different, and there are few references in this regard.

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