A method for measuring the Brinell hardness of 9-12cr% ferritic heat-resistant steel on site
A technology of Brinell hardness and ferrite, which is applied in the field of Brinell hardness testing of ferritic heat-resistant steel, to achieve the effect of improving accuracy and pertinence
Active Publication Date: 2016-03-30
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology
Due to the different mechanical meanings of various hardness standards, in general, it should be avoided to convert the Leeb hardness into other hardnesses. When conversion is necessary, for common metal materials, you can refer to the relevant data conversion table. However, according to GB / T17394-1998 " According to the regulations in "Metal Leeb Hardness Test Method", the conversion relationship in the Leeb hardness tester is only applicable to low-carbon steel, low-alloy steel and cast steel. Its elastic modulus has changed a lot, if the original conversion relationship is still used, there will be great uncertainty
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Embodiment 1
[0029] Tested with P91 steel, F12 steel and 2Cr12NiW1Mo1V steel respectively,
[0030] (1) Grind the test surface of the sample into a ground plane, the surface roughness parameter Ra of the sample is not greater than 1.6 μm, and the test surface should have a metallic luster, and there should be no scale and other dirt. Measure at least 5 test points with a Leeb hardness tester, and take the average value of 5 effective test points as the Leeb hardness tester value HBHLD of the sample to be tested in this state. Requirements: Leeb hardness test procedures are in accordance with GB / T17394- 1998 "Metal Leeb Hardness Test Method", the procedure is to use D-shaped indenter to indent the Leeb hardness along the vertical direction under ambient temperature conditions. The distance between the centers of any two indentations is not less than 3mm. The distance between the center and the edge of the sample is not less than 5mm;
[0031] (2) Substitute the measured Leeb hardness value...
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Abstract
The invention relates to a method for on-site measurement of Brinell hardness of a 9-12 Cr% ferrite heat resistant steel. The method comprises the steps of: preparing steel samples of different textures of the 9-12 Cr% ferrite heat resistant steel, and pretreating the steel samples; testing the Brinell hardness number HBW of each sample with a desk type Brinell hardness tester; testing the Leeb hardness tester value HBHLD corresponding to each sample with a Leeb hardness tester; making a hardness comparison curve with the average values of HBW and HBHLD, thus obtaining the relational formula of HBW=1.15HBHLD+A, with A in the range of 5-22; pretreating the samples to be measured, and determining the Leeb hardness tester value HBHLD, which is then put into the formula so as to obtain the Brinell hardness of the samples. The method of the invention solves the present adaptability problem of 9-12 Cr% ferrite heat resistant steel Brinell hardness, and can obtain the Brinell hardness directly through on-site measurement, thus providing a correct hardness index for on-site postweld heat treatment of the 9-12 Cr% ferrite heat resistant steel.
Description
technical field [0001] The invention relates to a method for testing the Brinell hardness of ferrite heat-resistant steel, which belongs to the technical field of metal materials. Background technique [0002] Hardness is an important performance index to measure the softness and hardness of metal materials, and it is a comprehensive index of mechanical properties such as elasticity, plasticity, strength and toughness of materials. Hardness is usually used to measure whether the performance of a material meets the requirements of use, especially for parts that are subjected to on-site post-weld heat treatment. It is convenient, fast, simple and intuitive to use hardness as an evaluation index. Therefore, hardness has become an important evaluation index for post-weld heat treatment of parts. . Because the Leeb hardness tester is small in size and easy to carry, it can test the hardness of the material conveniently and quickly. Therefore, the Leeb hardness tester is generall...
Claims
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IPC IPC(8): G01N3/42
Inventor 李新梅张忠文杜宝帅彭宪友
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY