Property characterizing method of power station boiler stainless steel elbow

A power station boiler, stainless steel technology, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve problems such as leaking and bursting pipe accidents, and achieve the effect of improving operational stability

Active Publication Date: 2018-06-12
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The actual operation of power plant boilers shows that there is no need for bends within the scope of hardness testing, and due to changes in the performance of the bends, accidents of leaking and bursting pipes may occur frequently

Method used

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  • Property characterizing method of power station boiler stainless steel elbow

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Embodiment 1

[0021] A method for characterizing the performance of stainless steel elbows used in power plant boilers. The method mainly uses the hardness difference method to characterize the performance of the elbows. The method includes the following steps:

[0022] (1) The substance to be characterized is a bent pipe for a power station boiler, and the said bent pipe for a power station boiler is made of stainless steel.

[0023] (2) After the bending pipe is processed, due to the processing hardness, the hardness value of the tensile side of the bending pipe will increase, and the hardness difference method is used to characterize the performance of the bending pipe used in the power plant boiler, wherein the hardness difference value is obtained by the power plant boiler. It is obtained by subtracting the hardness value of the tension side of the bend from the hardness value of the straight pipe section.

[0024] (3) Use a Leeb hardness tester for hardness measurement without damagin...

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Abstract

The invention discloses a property characterizing method of a power station boiler stainless steel elbow. During a power station boiler production process, elbow technology is applied in a large scaleto cold-bending small-diameter steel pipes, the shape, the size, the performance and the like of the cold-bent steel pipes can change, and the elbow parts of the cold-bent steel pipes turn to be theweak parts of the steel pipes, particularly of austenitic stainless steel. According to the power station boiler stainless steel elbow property characterizing method, a Leeb hardness tester is used for measuring the hardness differences of different positions of elbows to characterize the properties of the elbows, and measurement results can be converted into common Brinell hardness values, so that the elbow properties can be characterized under the condition of not damaging elbow bodies, and the elbows requiring solution treatment can be screened out to ensure safe application of power station boiler stainless steel elbows. The property characterizing method of the power station boiler stainless steel elbow can be applied to property detection of stainless steel elbows.

Description

Technical field: [0001] The invention relates to a performance characterization method of a stainless steel elbow used in a power station boiler. Background technique: [0002] In the production process of power station boilers, a large number of pipe bending technology is used to cold-bend small-diameter steel pipes. After cold-bending, the shape, size, and performance of the steel pipes will change. Tensitic stainless steel, strain-induced martensitic transformation may occur after cold bending, combined with the work hardening of the steel pipe, the hardness of the tension side and compression side of the elbow will increase significantly, and the plasticity and toughness will decrease, which may eventually lead to boiler operation. During the process, the elbows failed prematurely, resulting in forced shutdown accidents. [0003] The items currently applied to the quality inspection of cold-formed steel pipes mainly include: appearance inspection, magnetic particle or p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/52
CPCG01N3/52G01N2203/0083G01N2203/0274
Inventor 郝维勋王硕魏力民谭舒平程义杨权
Owner HARBIN BOILER
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