A	Atomic mass of an element [g·mol−1]
Blank	The cracking experiment in which no DMDS is added during cracking or the pretreatment
CC	cracking cycle
CA	The experiment that DMDS diluted in steam is continuously added during cracking.
CA+PreS	The experiment in which continuous addition of DMDS is combined with presulfiding.
Coking	The process during cracking that coke is depositing on the sample
Cyclic aging	A cyclic process that simulates the real behavior of an industrial cracker using the repetition of coking and decoking of the material
Decoking	The process after cracking that the coke is burned into carbon oxides using steam or air or mixture thereof
DMDS	Dimethyl disulfide
FID	Flame ionization detector
F	Flow rate [10−6 kg·s−1]
H	Penetration depth [µm]
HTA	High temperature alloy
JSR	Jet-stirred reactor
PreS	Presulfiding experiment. The experiment in which presulfiding is applied before cracking
rc	coking rate [kg·s−1·m−2]
rc, initial	initial catalytic coking rate [kg·s−1·m−2]
rc, asymptotic	Asymptotic/pyrolytic coking rate [kg·s−1·m−2 ]
rx-y	Average coking rate in between the given time intervals [kg·s−1·m−2]
RGA	Refinery gas analyzer
S	Surface area of the sample [m2]
sample	The metal sample cut from real industrial coil that is placed in the JSR
SEM	Scanning electron microscopy
TCD	Thermal conductivity detector
T	Temperature [K]
V	Accelerating voltage [kV]
WDS	Wavelength-dispersive spectroscopy
XPS	X-ray photoelectron spectroscopy
z	Atomic number
δ	Dilution [kg·kg−1]
ρ	Density of the material [g·cm−3]
τ	Mean residence time [s]