ISO 9950 Industrial Quenching Oils - Determination of Cooling Properties - Nickel Alloy Probe Test Method

Liquids and Fuel Tests

ISO 9950 Industrial Quenching Oils - Determination of Cooling Properties - Nickel Alloy Probe Test Method

Developed by the International Standards Organization (ISO), the ISO 9950 standard covers a laboratory test using a nickel alloy probe for the determination of the cooling properties of industrial quenching oils. The test is performed on unmixed oils and can therefore rank the cooling properties of different oils under standard conditions.

ISO 9950 Industrial Quenching Oils - Determination of Cooling Properties - Nickel Alloy Probe Test Method

When hardening steel, quenching is normally the most critical step in the hardening process. For quenching, the heat treater can use oils, water-based polymer solutions, emulsions, etc. It has to choose between different quenching media such as In addition, a wide variety of cutting agents are commercially available for each type of media. Also, the cooling properties of each quenching medium, thermal degradation, fouling, entrainment, etc. may change during service for reasons

A number of methods are used to evaluate the extinguishing environment. Indirect testing involving the hardening of test pieces of a particular steel gives only limited information about its cooling properties. The most common method for direct testing is the silver ball method, in which a silver ball (probe) with a thermocouple in its center is heated and quenched in that quenching medium. Temperature is recorded as a function of time, and usually the cooling rate is also recorded as a function of temperature (or time).

Due mainly to the difficulties associated with the manufacture of silver ball probes and the evaluation of test results, several modified probes were used with the same basic method. The probes are made of various materials and different sizes, the shape is normally cylindrical.

To enable comparison between test results from different laboratories and technical descriptions of the quenching medium from different suppliers, it is necessary to use a standardized test method. Therefore, the International Federation of Materials Heat Treatment (IFHT) Technical Committee, Scientific and Technological Aspects of Quenching, evaluated the different methods available and organized tests in various countries to reach agreement on a recommended method. The specification in this International Standard is the result of work within this committee.

This standard method is based on a method prepared by a working group of the Wolfson Heat Treatment Center Engineering Group, Aston University, Birmingham, UK and is identical in all essential details. The deviation between the two methods relates to the measurement system in which a computer-based system for recording and differentiating the thermocouple signal is added as an alternative to the method described in this International Standard.

Among the services provided by our organization within the framework of material testing services, there are also ISO 9950 standard tests. Do not hesitate to contact our laboratory EUROLAB for your testing and certification requests.

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