The scope of application of this product:
Apply to all kinds of Auto-oil piping、braking piping、
boost-steering gear piping.
Products functions:
Our company select single/double-wall welding-pipe(bundy tube),
which are all accord with Country YB/T4164-2007 standards Mechanical functions:
Rm≥290MPa
Rel≥180MPa
A≥25%
ID cleanliness: residuum ≤ 0.16g/ m2 Salt spray test : no rusty on OD in 30000 hours Good Resist-sand functionv、thickness of coating is 100-250μm | 
