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I need 27 j impact energy at -20C temp. for s235j2 (C:0.1- Si:0.04- Mn:0.45- P: 0.025, S: 0.02)

what heat treatment cycle is good for this steel?

a few things can effect the results, such as dimentions, because thinner cross sections will cool faster than thicker, also rate of quench was not stated,   not aware of many water and oil quenches, how do you keep the oil suspended, and what is its quench rate compared to water or a fast straight oil?

thanks for your pay attention, what's the meaning of "how do you keep the oil suspendedhow do you keep the oil suspended" , really i can't realize the meaning of suspended for oil.

the quench rate of oil is good, beacause in some products of AISI 4337 , we have quenching cracks.

for some bundle we quenched in water and oil, the structure has ferrite with martensite and bainite.
austenitizing temp. 860C
Holding time: 60 min
Dipping time:300 seconds
moving time: 100seconds
has anyone knowledge about existence of ferrite in quench microstructure?