quenching oil mcmaster carr

[jackie]

i see they have two quenching oils a 28 sec and a 11 sec oil . is either one of these oils good enough for 1095 steel. does 28 sec  or 11 sec mean it will take that long to cool the steel  thank you .

[kbaknife]

Maybe this will help:

Oils are generally classified by their ability to transfer heat as fast, medium or slow “speed” oils (Table 2). Fast (8-10 second) oils are used for low hardenability alloys, carburized and carbonitrided parts, and large cross-sections that require high cooling rates to produce maximum properties. Medium (11-14 second) oils are typically used to quench medium- to high-hardenability steels. Slow (15-20 second) oils are used where hardenability of a steel is high enough to compensate for the slow cooling aspects of this medium [2].

So, since you are referring to 1095, which is a shallow hardening steel, or "low hardenability" steel, the 8-10 second 'fast' oil would work well.
Don't forget that for a quench oil to do its job correctly, the steel must first be sufficiently converted to austenite at a somewhat controlled temp to be converted to martensite with the quench.

Those 'seconds' are referring to the oil's ability to extract temperature at a rate that will lower the steel's temp from XXX # of degrees to YYY # of degrees in a given amount of time.

[kbaknife]

There is truly fascinating information here if one can chew through it.

 http://www.industrialheating.com/Articles/Online_Exclusives/BNP_GUID_9-5-2006_A_10000000000001021860