Creeping wave detection method for crack defects of austenitic stainless steel pipe for power station boiler

A technology for austenitic stainless steel and power plant boilers, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, which can solve the problems of large initial wave occupation and difficulty of shear wave oblique probes, and achieve the effect of convenient operation and strong practicability

Inactive Publication Date: 2015-05-20
XIAN THERMAL POWER RES INST CO LTD
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AI Technical Summary

Problems solved by technology

Although ultrasonic 5P6mm×6mmK2.5~2.7 shear-wave oblique probes can be used at present to detect the base metal of austenitic stainless steel pipes for boilers, there is a problem that the initial wave width of the shear-wave oblique probe

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  • Creeping wave detection method for crack defects of austenitic stainless steel pipe for power station boiler
  • Creeping wave detection method for crack defects of austenitic stainless steel pipe for power station boiler

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Embodiment Construction

[0017] The present invention is described in further detail below in conjunction with accompanying drawing:

[0018] refer to figure 1 , the creeping wave detection method of the austenitic stainless steel pipe crack defect of the utility boiler of the present invention comprises the following steps:

[0019] 1) Select the climbing frequency emitted by the climbing wave probe, and then grind the bottom of the wedge into an arc surface that matches the position to be measured of the austenitic stainless steel pipe used in the utility boiler;

[0020] 2) The climbing wave probe emits climbing waves, glue the climbing wave probe to the wedge, adjust the climbing wave probe so that the incident angle of the longitudinal wave emitted by the climbing wave probe in the wedge is 25-27.6°;

[0021] 3) Fit the curved surface at the bottom of the wedge bonded with the creeping wave probe to the position to be tested of the austenitic stainless steel pipe used for the power plant boiler,...

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Abstract

The invention discloses a creeping wave detection method for crack defects of an austenitic stainless steel pipe for a power station boiler. The method comprises the following steps: (1) selecting frequencies of a creeping wave probe, a wedge block and a probe, polishing the bottom of the wedge block into an arc surface which is matched with a to-be-detected position of the austenitic stainless steel pipe for the power station boiler; (2) emitting a creeping wave by the creeping wave probe, bonding the creeping wave probe on the wedge block, and adjusting the incident angle of a transmitted longitudinal wave in a wafer wedge block of the creeping wave probe to be 25-27.6 degrees; and (3) attaching the arc surface of the bottom of the wedge block of the creeping wave probe to the to-be-detected position of the austenitic stainless steel pipe for the power station boiler, emitting the creeping wave through the creeping wave probe, emitting the creeping wave to the inner surface and the outer surface of the austenitic stainless steel pipe for the power station boiler, and then judging whether the crack defects exist or not according to the collected reflected waves on the inner surface and the outer surface of the austenitic stainless steel pipe for the power station boiler. According to the creeping wave detection method, detection of the crack defects on the austenitic stainless steel pipe for the power station boiler can be effectively finished.

Description

technical field [0001] The invention relates to a creeping wave detection method, in particular to a creeping wave detection method for crack defects in austenitic stainless steel pipes used in power plant boilers. Background technique [0002] Among the high-temperature pressure-bearing components of coal-fired power plants, the heating surface tubes in the boiler have the worst service conditions, and the operating environments of superheaters and reheaters are particularly harsh. Under the comprehensive effects of high temperature, high pressure, steam oxidation and flue gas corrosion, the material for the heating surface tube in the furnace requires not only high creep strength, but also excellent steam oxidation resistance and flue gas corrosion resistance. Cold workability and weldability. Austenitic heat-resistant steel has excellent comprehensive performance. Austenitic stainless steel has been used in large quantities in the superheater / reheater tubes of supercriti...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 张红军孟永乐殷尊侯召堂高磊马翼超吕一楠
Owner XIAN THERMAL POWER RES INST CO LTD
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