YB/T 4164-2007 English PDF (YBT4164-2007)

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YB/T 4164-2007: Double wall copper-brazed steel tubing
YB/T 4164-2007
YB
FERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Double wall copper-brazed steel tubing
ISSUED ON: MAY 29, 2007
IMPLEMENTED ON: NOVEMBER 01, 2007
Issued by: National Development and Reform Commission, People's
Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Order content ... 5 
4 Size, shape and weight ... 5 
5 Technical requirements ... 8 
6 Test methods ... 10 
7 Inspection rules ... 11 
8 Packaging, marks and quality certificate ... 12 
Annex A (normative) Double-layer flaring test ... 13 
Annex B (informative) Minimum burst pressure of steel tube ... 15 
Annex C (normative) Test method for cleanliness of inner surface ... 16 
Annex D (informative) Galvanized corrosion-resistant protective layer of steel
tube ... 17 
Double wall copper-brazed steel tubing
1 Scope
This Standard specifies the size, shape, weight, technical requirements, test
methods, inspection rules, packaging, marks and quality certificate of double
wall copper-brazed steel tubing.
This Standard is applicable to the double wall copper-brazed steel tubing that
uses copper as brazing material used to make brake tubing, fuel tubing,
lubricating oil tubing, heating or coolers and other engineering pipelines in
automobile, refrigeration, electric heating, electrical appliances and other
industries.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 228, Metallic materials - Tensile testing (GB/T 228-2002, eqv ISO 6892:
1998)
GB/T 241, Metal materials - Tube - Hydrostatic pressure test
GB/T 242, Metal materials - Tube - Drift-expending test (GB/T 242-1997, eqv
ISO 8493: 1986)
GB/T 244, Metallic materials - Tube - Bend test method (GB/T 244-1997, eqv
ISO 8491:1986)
GB/T 246, Metallic materials - Tube - Flattening test (GB/T 246-1997, eqv
ISO 8492: 1986)
GB/T 2102, Acceptance packing marking and quality certification of steel
pipe
GB/T 7735-2004, Steel tubes - The Inspection Method on Eddy Current Test
(GB/T 7735-2004, ISO 9304: 1989, MOD)
GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests (GB/T
10125-1997, eqv ISO 9227: 1990)
5 Technical requirements
5.1 Technical requirements for steel strips
The technical requirements of copper-plated steel strip for tubing making shall
comply with YB/T 069.
5.2 Production method
The steel tube shall be manufactured by coiling the copper-locked steel strip
into two turns, heating and needle welding in a reducing atmosphere to form a
double-layer pipe wall. Agreed by the supplier and the purchaser and indicated
in the contract, it is also possible to use a manufacturing method of drawing a
double-layer brazed steel tube of a certain specification into another
specification.
5.3 Mechanical properties
The mechanical properties of steel tube that has not been straightened and
processed shall meet the requirements of Table 4. Agreed by the supplier and
the purchaser and indicated in the contract, the mechanical properties of steel
tube can also be subject to regulations other than Table 4.
Table 4 -- Mechanical properties of steel tube
Tensile strength Rm, MPa Yield strength ReL, MPa Elongation after breaking A, %
≥290 ≥180 ≥25
5.4 Process test
5.4.1 Composite test of flattening and bending
Steel tube shall be subjected to the composite test of flattening and bending.
The pressure plate squashes the steel tube with the sample length of
50mm~100mm to contact with the inner wall. The direction of the welding seam
and the flattening force is 90°. The flattened sample is bent 90° around an axis
with a diameter equal to 6 times the wall thickness of the steel tube along the
axis of the tubing. Straighten it. The sample after the test shall not have cracks,
breaches or weld cracks.
5.4.2 Flaring test
Steel tube shall be subjected to flaring test. Sample length is 50mm~100mm.
The top center taper is 12°. The outer diameter flaring rate is 20%. The sample
after the test shall not have cracks, breaches or weld cracks.
5.4.3 Bending test
otherwise specified in the contract, the compactness test is selected by the
manufacturer. Either eddy current defect inspection or air tightness inspection
can be used, or both inspections can be selected at the same time.
Eddy current defect inspection and air tightness inspection shall meet the
following requirements:
a) Eddy current defect inspection shall be in accordance with acceptance
level A of GB/T 7735. Agreed by both parties, the manufacturer can also
use other higher acceptance levels.
b) The test pressure for air tightness inspection of steel tube is
1.55MPa~1.73MPa. The shortest holding time is 5min. The pressure in
the pipe shall not drop. When the steel tube that has passed the eddy
current defect detection inspection is further tested for air tightness, the
lower limit of the test pressure is 0.6MPa.
5.7 Surface quality
The inner and outer surfaces of the steel tube shall be clean and smooth. There
shall be no harmful defects that affect the use.
5.8 Inner surface cleanliness
Steel tube shall be checked for cleanliness of the inner surface. Residues on
internal surface cleanliness shall not exceed 0.16g/m2.
5.9 Outer plating layer
5.9.1 The requirements of the copper plating layer of the steel tube and the
choice of the outer surface corrosion protection layer are determined by the
supplier and the purchaser through negotiation.
NOTE: The copper plating layer on the surface of the steel tube is the product of the steel
tube manufacturing process, not the protective layer of the steel tube. The requirements
for the copper layer on the surface of the steel tube shall be negotiated by the supplier and
the purchaser.
5.9.2 Required by the purchaser, the outer surface of automotive steel tube can
be galvanized or coated with other corrosion protection layers. Refer to Annex
D for the galvanized corrosion-resistant protective layer on the outer surface of
the steel tube.
6 Test methods
6.1 The size and shape of the steel tube shall be measured one by one with a
composed of steel tubes of the same heat number, the same designation, and
the same specification. The number of steel tubes in each batch does not
exceed 100km.
7.3 Sampling quantity
The sampling quantity for various performance inspections of each batch of
steel tubes shall meet the requirements of Table 5.
7.4 Rules for reinspection and determination
The rules for reinspection and determination of steel tubes shall comply with
GB/T 2102.
8 Packaging, marks and quality certificate
8.1 Strip steel tubes shall be bundled into bundles. Each bundle shall be
wrapped with moisture-proof paper or plastic tape (bag), and then wrapped with
plastic woven tape or sack. It can also be wrapped in moisture-proof paper or
plastic tape (bag) and packed into a special wooden (iron) box.
8.2 The coiled steel tubes shall be wrapped with moisture-proof paper or plastic
tape (bag), and then wrapped with plastic woven tape or sack. It can also be
wrapped in moisture-proof paper or plastic tape (bag) and packed into a special
wooden (iron) box.
8.3 ...