Description / Abstract:
This specification covers sub-critically annealed electric
resistance welded and cold-drawn single-wall high strength low
alloy steel tubing intended for use in hydraulic pressure lines and
in other applications requiring tubing of a quality suitable for
bending, flaring, cold forming, welding and brazing.
The grade of material produced to this specification is of
micro-alloy content and is considerably stronger and intended to
service higher pressure applications using thinner walls than like
sizes of the grades of material specified in SAE J525, SAE J2467
and SAE J2614. Due to the alloy content of the material, the
forming characteristics of the finished tube are equal to or
better, when compared to SAE J525, SAE J2467 and SAE J2614. Nominal
reference working pressures for this tubing are listed in ISO 10763
and SAE J1065.
Caution: When brazing or welding is used as a tube end joining
method, the structural integrity of the tube material can
potentially be compromised due to the degradation of the areas
affected by the thermal effect applied to the tubing; therefore,
the ISO 10763 and SAE J1065 nominal reference working pressures may
not be applicable.
Brazed and/or welded tube assembly configurations made to
specific geometry and components bill of material in association
with this material, may require qualification testing in accordance
with ISO 19879 Test Methods for Hydraulic Fluid Power Connections.
Cold forming the tube end configurations avoids this systemic
testing by not compromising the tube material structural
integrity.