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Precision seamless steel tube national standards

Article Source:Popularity:Issuing time:2016-7-30 19:52:44smallinBig

 Precision seamless steel tube national standards

 
Execution standard
 
GB/T3639
 
GB/T8713
 
DIN2391-2
 
HK15-2000.
 
use
 
Used in the manufacture of mechanical structure, hydraulic equipment, car parts
 
The delivery status
 
The delivery status
 
Code name
 
Said Ming
 
Cold working/hard
 
BK
 
Without heat treatment after the final cold work, thus the pipe can be carried out only a small deformation
 
Cold working/soft
 
BKW
 
Small deformation amount of cold work, after the final heat treatment of steel pipe end processing
 
Allowing limited cold deformation (e.g., bending, flaring)
 
Eliminating stress annealing after cold working
 
BKS
 
The cold working under Ac 1 after annealing, to eliminate cold stress
 
annealing
 
GBK
 
, after the final cold working steel tube under the protective atmosphere of annealing completely
 
Is the fire
 
NBK
 
?