Check patentability & draft patents in minutes with Patsnap Eureka AI!

Metallographical method for identifying overtemperature range of TP347H boiler tube

A boiler tube and amplitude technology, which is applied in the investigation stage/state change, etc., can solve the problems of being unable to identify the over-temperature and over-temperature range of TP347H boiler tubes from an organizational perspective, and cannot judge the over-temperature range, etc., achieving low cost and safe operation Effect

Inactive Publication Date: 2016-07-27
XIAN THERMAL POWER RES INST CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual use process, TP347H boiler tubes continue to burst due to long-term over-temperature service (exceeding the upper limit of the TP347H operating temperature), because the metallographic structure of the TP347H boiler tubes when the tube bursts at an over-temperature temperature will not occur. Change, creep holes and microcracks can only judge whether the temperature is overheated but not the extent of the overtemperature, so it is impossible to identify whether the TP347H boiler tube is overheated and the extent of the overtemperature from the perspective of organization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Metallographical method for identifying overtemperature range of TP347H boiler tube
  • Metallographical method for identifying overtemperature range of TP347H boiler tube
  • Metallographical method for identifying overtemperature range of TP347H boiler tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] The materials used in the implementation cases of the present invention are ASMESA213TP347H boiler tube non-overtemperature samples and overtemperature samples, and their chemical compositions are shown in Table 1.

[0025] Table 1: Chemical composition (wt%) of TP347H steel in the implementation case

[0026]

[0027] First, use aqua regia to etch TP347H non-overtemperature boiler tube samples and overtemperature boiler tube samples according to the method in DL / T884-2004 "Technical Guidelines for Metallographic Inspection and Evaluation of Thermal Power Plants". The obtained metallographic structure is shown in Image 6 and Figure 7 . It can be seen from the figure that the structure of the non-overheated TP347H boiler tube sample is austenite + a small amount of second phase, and the structure of the overheated TP347H boiler tu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a metallographic method for identifying the overtemperature range of TP347H boiler tubes. The method utilizes the sigma phase in the structure of TP347H boiler tubes where the most likely precipitation temperature is 750°C and the precipitation temperature range is between 650°C-850°C. According to whether there are a large number of precipitated phases in the metallographic phase, it is judged whether there is an over-temperature and the over-temperature range. The invention can judge whether there is an overtemperature and the overtemperature range of the TP347H boiler tube from the perspective of organization.

Description

Technical field: [0001] The invention belongs to the technical field of metallographic analysis in iron and steel, and in particular relates to a metallographic method for identifying the overtemperature range of TP347H boiler tubes. Background technique: [0002] TP347H austenitic heat-resistant steel is widely used in high-temperature heating surfaces of large-capacity thermal power unit boilers (referred to as boiler tubes) because of its high creep strength, good structural stability and excellent flue gas corrosion resistance. TSGG0001-2012 and DL / T715-2015 stipulate that the upper limit of its service temperature is 670°C (outer wall temperature of the flue gas side pipe). Since the transformation point of TP347H is below room temperature, its supply state structure is austenite at room temperature, and it is different from other non-austenitic steel boiler tubes (phase transformation point A C1 Between 730°C and 845°C) are different. [0003] In the actual use proce...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N25/12
CPCG01N25/12
Inventor 史志刚马红崔雄华王弘喆
Owner XIAN THERMAL POWER RES INST CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com