ASTM D6200 Determination of Cooling Characteristics of Quench Oils
ASTM D6200 Standard Test Method for Determination of Cooling Characteristics of Quench Oils by Cooling Curve Analysis
1. Scope
1.1 This test method describes the equipment and the procedure for evaluation of a quenching oil's quenching characteristics by cooling rate determination.
1.2 This test is designed to evaluate quenching oils in a non-agitated system. There is no correlation between these test results and the results obtained in agitated systems.
1.3 The values in SI units are to be regarded as the standard. The values in parenthesis are provided for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D1744 Test Method for Water in Liquid Petroleum Products by Karl Fischer Reagent
E 220 Test Method for Calibration of Thermocouples by Comparison Techniques
E 230 Specification for Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples
2.2 SAE Standards:
AMS 5665 Nickel Alloy Corrosion and Heat Resistant Bars, Forgings and Rings
2.3 Japanese Industrial Standards (JIS):
JIS K 2242-1980 Heat Treating Oil
JIS K 6753-1977 Di-2-ethylhexyl Phthalate
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 cooling curve - The cooling curve is a graphical representation of the cooling time (t) - temperature (T) response of the probe (see 7.3). An example is illustrated in Part B of Fig. 1.
3.1.2 cooling curve analysis - the process of quantifying the cooling characteristics of a heat treating oil based on the temperature versus time profile obtained by cooling a preheated metal probe assembly (see Fig. 2) under standard conditions.
3.1.3 cooling rate curve - The cooling rate curve is obtained by calculating the first derivative (dT/dt) of the cooling time - temperature curve. An example is illustrated in Part B of Fig. 1.
3.1.4 heat treating oil - a hydrocarbon containing product, often derived from petroleum base stock, that is used to mediate heat transfer between heated metal, such as austenitized steel, to control the microstructure that is formed upon cooling and also control distortion and minimize cracking which may accompany the cooling process.
3.1.5 quench severity - the ability of a quenching medium to extract heat from a hot metal.
