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Recommended temperature of the material to test for hardness

Recommended temperature of the material to test for hardness

Recommended temperature of the material to test for hardness

(OP)
What is the recommended temperature of a material before a standard Brinell hardness test is performed? Ambient?

RE: Recommended temperature of the material to test for hardness

Typically, room temperture. Refer to ASTM E10 Standard Test Method for Brinell Hardness of Metallic Materials. For portable hardness testing, refer to ASTM E110.

RE: Recommended temperature of the material to test for hardness

I searched E 10 but can find no reference to test temperature - logic says ambient

RE: Recommended temperature of the material to test for hardness

Unfortunately, I can't remember where I saw it (maybe in NASM 1312) but I seem to remember the recommended ambient temp. for hardness testing is 10 to 35degC (50 - 95degF)

RE: Recommended temperature of the material to test for hardness

ASTM E10 only requires that the manufacturer of calibration blocks perform the calibration at 23+5oC.

As long as the calibration blocks & material being tested are similar material & at the same temperature, any ambient temperature comfortable to the operator should be OK.  However, if not using calibration blocks, some of the force calibration methods as given in ASTM E4 require ~constant temperature (+2oF or +1oC).

The testing temperature range mentioned by yates is also found in ASTM E18 (Rockwell hardness testing).

RE: Recommended temperature of the material to test for hardness

I recommend reviewing the NIST Special Report on hardness testing (960-5), which is available for download using the following link:

www.metallurgy.nist.gov/reports/recommendedpractice/SP960_5.pdf

Section 3.4.9.1 has a good discussion of temperature.

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