Seamless Precision
Steel Tubes according to EN ******1Standard: DIN***1 part 2 , DIN
EN******1, DIN****5 etc; Material: ST*5,ST*5,ST*2. Manufacturing
method: cold-rolled /
cold-drawn Delivery
condition: BK,BKS,SR,GBK,NBK.
Certificate Factory
Certification: 2.2 according to
EN Acceptance
Test Certificate:3.1 according to EN
****4
Packing: in bundles tied with
steel strips. External packing by wooden cases if the wall
thickness/OD ratio is low. Oil-coating is
generally necessary especially for export.
Application:
Used in hydraulic & pneumatic cylinder ,automobile and other
mechanical device .Feature: high precision and high brightness, the
inner and outer surface of the tubes have high cleanness without
oxid, mechanical properties of the final tubes also come out
excellent, promising no leakage under high pressure, no deformation
after cold-bent and no cracks when flaring and flattening, ensuring
the efficient operation in all service. NBK means protective heat-treating under the
non-oxidation enviroment to get a bright and smooth surface for the
tubes.
DIN ******1 Part 2 Seamless Precision steel
tubes(DIN******1) Standard DIN ***1
defines the technical delivery conditions for seamless precision
steel tubes according to DIN ***1 Part 1 which are made from the
steel grades listed in section 5.
Tubes according to this Standard are mainly used where accuracy to
dimension and, possibly, small wall thicknesses and good surface
condition are required.Note:
The yield point for the annealed (GBK)condition
on delivery is at least *0% of the (ultimate) tensile strength.
Depending upon the degree of deformation in the drawing operation,
the yield point of tubes delivered in the cold-finished/hard
(BK)and cold-finished/soft(BKW) conditions, may be increased to a
level close to the tensile
strength.
In calculating the yield point, the following
values are recommended : cold-finished/hard condition on delivery ≥
*0% of the tensile strength, cold-finished/soft condition on
delivery ≥ *0% of the tensile
strength.
Quality
gradeThe tubes are supplied in the following quality
grades : A) precision steel
tubes intended primarily for mechanical stressing, without any
particular quality requirement and without acceptance test
certificate.
B) precision steel tubes intended primarily for mechanical
stressing, with special quirement and exclusively with acceptance
test certificate.
C) precision steel tubes with special requirement according to
section *2. Theses requirements and corresponding tests must be
agreed, with the customer having to specify his requirements at the
time of enquiry and on ordering.
