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P91 steel long-time strength evaluation method and P91 steel long-time strength evaluation apparatus

A long-lasting strength, P91 technology, applied in the direction of measuring device, strength characteristics, testing material hardness, etc., can solve the problems of difficult completion, large test cost, large sample size, etc., to save time, quickly, effectively and accurately obtain, and save costs. Effect

Inactive Publication Date: 2016-05-25
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1. From the perspective of work efficiency, the test time is too long, it is difficult to solve the urgent problem of actual work, and the efficiency is extremely low
[0008] 2. From an economic point of view, for a material or component with a certain hardness, the 10,000-hour high-temperature endurance test requires huge test funds and is difficult to complete
[0009] 3. From the perspective of the component itself, due to the large number of individual samples required for the durability test, it is sometimes difficult to fully satisfy the volume of a material or component with a certain hardness, and it is impossible to carry out all tests

Method used

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Embodiment 1

[0083] For P91 steel with HB=160, the durable strength value σ calculated by the quantitative relationship in the present invention under the condition of 540°C 540 =95MPa, while the recommended data checked according to Appendix C of GB5310-2008 "Seamless Steel for High Pressure Boilers" is 166MPa, and the error between the recommended value and the actual calculated value is 74.7%.

Embodiment 2

[0085] For P91 steel with HB=163, the durable strength value σ calculated by the quantitative relationship in the present invention under the condition of 540°C 540 =107MPa, while the recommended data checked according to Appendix C of GB5310-2008 "Seamless Steel for High Pressure Boilers" is 166MPa, and the error between the recommended value and the actual calculated value is 35.5%.

Embodiment 3

[0087] For P91 steel with HB=180, the durable strength value σ calculated by the quantitative relationship in the present invention under the condition of 540°C 540 =155MPa, while the recommended data checked according to Appendix C of GB5310-2008 "Seamless Steel for High Pressure Boilers" is 166MPa, and the error between the recommended value and the actual calculated value is 7.1%.

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Abstract

The present invention relates to a P91 steel long-time strength evaluation method and a P91 steel long-time strength evaluation apparatus. The P91 steel long-time strength evaluation method comprises: obtaining a P91 steel test sample; and obtaining the long-time strength value of the P91 steel according to the quantitative relationship between the Brinell hardness and the long-time strength of the P91 steel, wherein the quantitative relationship between the Brinell hardness and the long-time strength of the P91 steel is [sigma]540=K1e<A*h>+(K2*10<6>)e<B*h>, the [sigma]540 is the long-time strength value of the P91 steel at a temperature of 540 DEG C, the unit is MPa, h is the actual Brinell hardness value of the test sample, and is more than or equal to 150 HB and is less than or equal to 230 HB, A B, K1 and K2 are constants, A is 0.0001754, B is -0.06986, K1 is 177.2, and K2 is -5.599.

Description

technical field [0001] The invention relates to the technical field of P91 steel, in particular to a method and device for evaluating the durable strength of P91 steel. Background technique [0002] With the rapid development of large-capacity, high-parameter ultra (super) critical units in thermal power plants in my country, P91 materials are widely used in subcritical units at 540 °C, mainly for main steam pipes, reheat steam pipes and their side High-temperature components such as roads and high-temperature headers. P91 steel is an improved 9Cr-1Mo high-strength martensitic heat-resistant steel developed on the basis of P9 by reducing the carbon content, adding alloy elements V and Nb, and controlling the content of N. It has good thermal strength (strength and toughness) High, good hardenability, good weldability, high thermal conductivity, small linear expansion coefficient, the most important thing is that the durable strength of P91 steel can reach 100MPa under the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N3/40
Inventor 蔡文河赵卫东王智春李炜丽
Owner STATE GRID CORP OF CHINA