GB/T 33825-2017 (GBT 33825-2017)

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GB/T 33825-2017
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.30
H 62
Steel/copper composite rod
and wire for hermetically sealed relay
ISSUED ON. MAY 31, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test method ... 7 
5 Inspection rules ... 8 
6 Mark, packaging, transport, storage and quality certificate... 9 
7 Order (or contract) content ... 10 
Annex A (Informative) Average linear expansion coefficient of the substrate
and electrical properties of the composite ... 11 
Foreword
This Standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This Standard was proposed by China Nonferrous Metals Industry
Association.
This Standard shall be under the jurisdiction of National Technical Committee
on Nonferrous Metals of Standardization Administration of China (SAC/TC
243).
The drafting organization of this Standard. Xi'an Norboer Precious Metal
Materials Co., Ltd.
Main drafters of this Standard. Zhou Longhai, Yu Jianjun, Zhao Tao, Han
Jiqing, Chen Hao, Zhou Yabo.
Steel/copper composite rod
and wire for hermetically sealed relay
1 Scope
This Standard specifies the requirements, test methods, inspection rules,
marks, packaging, transport, storage, quality certificate and order (or contract)
of steel/copper composite rod and wire for hermetically sealed relay.
This Standard applies to steel/copper composite rod and wire for hermetically
sealed relay (hereinafter referred to as the composite rod and wire).
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 223.20, Methods for chemical analysis of iron steel and alloy - The
Potentiometric titration method for the determination of cobalt content
GB/T 223.25, Methods for chemical analysis of iron, steel and alloy - The
dimethylglyoxime gravimetric method for the determination of nickel
content
GB/T 3077, Alloy structure steels
GB/T 4336, Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 5121(all parts), Methods for chemical analysis of copper and copper
alloys
GB/T 5231, Designation and chemical composition of wrought copper and
copper alloys
GB/T 6462, Metallic and oxide coatings - Measurement of coating
thickness - Microscope method
YS/T 668, Sampling method of physical and chemical testing for copper
and copper alloys
YB/T 5231, Sealed iron-nickel-cobalt alloy with permanent expansion
The product and test accessories shall be tested after sealing. The leakage
rate is not more than 1×10-4 Pa · cm3/s.
3.7 Appearance quality
Product surface shall be bright and clean, no obvious longitudinal scratches,
cracks, peelings, inclusions, pressure pit or other defects, allowing a slight
local scratch or straightening roll.
4 Test method
4.1 Chemical composition
The analysis of Ni element with the substrates of 4J29, 4J44, 4J33, 4J34, 4J4
is carried out according to GB/T 223.25. The analysis of Co element is carried
out according to GB/T 223.20. The analysis of other element shall be in
accordance with GB/T 4336 or the method agreed by the supplier and the
purchaser. The chemical composition analysis with the substrate of
30CrMnSiA is carried out according to GB/T 4336. The chemical composition
analysis of composite is carried out according to GB/T 5121 (all parts).
4.2 Dimension and its allowable deviation
The outer diameter of the product is measured with a micrometer. The length
is measured with a tape measure. And the diameter of the composite is
measured according to GB/T 6462.
4.3 Surface roughness
The surface roughness of the product is measured with a roughness meter.
4.4 Composite quality
The finished wire is repeatedly bent until it is broken. And the fracture
longitudinal metallographic sample is prepared and observed with a 30x
microscope.
4.5 Air tightness
The testing of the product's air tightness is carried out according to the
method agreed by the supplier and the purchaser.
4.6 Appearance quality
The appearance of the product is visually inspected.
batch
Air tightness Twenty samples at random from each batch 3.6 4.5
Appearance quality Piece by piece or by roll 3.7 4.6
5.5 Determination of inspection results
5.5.1 If the chemical composition fails, this batch of products shall be
rejected.
5.5.2 Should the dimension and its allowable deviation, surface roughness,
appearance quality fail, this piece or roll of products shall be rejected.
5.5.3 When the air tightness qualification rate is not greater than 90%, this
batch of products shall be rejected.
5.5.4 If a sample of composite quality inspection fails, it shall extract double
samples from this batch to repeat the test (including the failed piece or roll in
the previous inspection). Only when the retesting results are qualified, this
whole batch of products shall be accepted. If there is still one sample in the
retesting failing, this whole batch of products shall be rejected.
6 Mark, packaging, transport, storage and quality
certificate
6.1 Mark
In addition to the inspection mark, the product shall be marked or labeled on
each box with.
a) supplier’s name;
b) product’s designation, dimension and status;
c) product’s batch number.
6.2 Packaging
The rods are in single or multiple bundles. The wires are in coils. Wrap in
plastic woven cloth or cosmetic paper. Load in a wooden box with plastic film,
moisture-proof paper or gas-phase rust-proof paper.
6.3 Transport and storage
During the product’s transport, it shall prevent bruises, abrasions. The
products shall be kept in a dry, non-corrosive place.