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Stainless tube surface types

Abbreviation	Type of fabrication	Surface type	Notes
C1	hot drawn, hot finished 1), descaled	metal clean
C2	hot drawn, hot finished 1), pickled
f	mechanically and chemically descaled, descaled, cold drawn cold finished	bright clean (as a result of forming) more glassy than C1 and C2	cold formed tubes without finishing heat treatment have wide range of properties based on type of forming, namely tubes with austenitic structure
g	cold drawn, hot finished, without descaling	descaled	is suited only for those parts that are descaled after an assembly
h	cold drawn, hot finished pickled	bright annealed, pickled, more glassy than C2
m	cold drawn hot finished without descaling	bright annealed, pickled, more glassy than C2
n2	Cold formed afterwards (polished by pulling) hot finished without scales	bright anneled – pickled, more glassy than C2	best suited for grinding and polishing
o	grinded	bright anneled - grinded, form and level of grinding has to be ordered in advance	default level is mostly H, M or N2
p	polished	bright annealed – polished, form and level of polishing has to be ordered in advance	default level is mostly H, M or N2