Property characterizing method of power station boiler stainless steel elbow

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...

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