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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