GB/T 3462-2017 English PDF (GBT3462-2017)

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GB/T 3462-2017: Bars and plate blanks of molybdenum
GB/T 3462-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 72
Replacing GB/T 3462-2007
Bars and plate blanks of molybdenum
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: JUNE 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 4 
4 Test method ... 6 
5 Inspection rules ... 6 
6 Marking, packaging, transportation, storage and quality certificate ... 8 
7 Content of the order form (or contract) ... 9 
Bars and plate blanks of molybdenum
1 Scope
This standard specifies the requirements, test methods, inspection rules and
markings, packaging, transportation, storage, quality certificates and order
forms (contract) for bars and plate blanks of molybdenum.
This standard applies to bars and plate blanks of molybdenum produced by
powder metallurgy and smelting methods.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 3850 Impermeable sintered metal materials and hard metals -
Determination of density
GB/T 4325 (all parts) Molybdenum chemical analysis method
GB/T 6394 Metal - Methods for estimating the average grain size
3 Requirements
3.1 Product classification
The product designations are divided into two designations: Mo-1 and Mo-2
according to different chemical compositions.
3.2 Chemical composition
The chemical composition of the product shall meet the requirements of Table
1.
3.5.4 The curvature of Mo-1 vertical frit bar is not more than 4 mm.
3.5.5 When the buyer has requirements for dimensional tolerances, it shall be
determined through negotiation between the supplier and the buyer.
3.6 Appearance quality
3.6.1 The surface of Mo-1 product is gray or dark gray metallic luster; there shall
be no water absorption. Oxidation color is allowed on the surface of the
straightening bar.
3.6.2 The sintered bar and plate blank are allowed to have traces formed by the
contact between the product and the product, and the product and the sintering
furnace body.
3.6.3 Mo-1 products shall not have over-melting, bubbling, delamination, cracks,
coarse surface crystals; there shall be no missing edges, missing corners, or
pits that may affect the use.
3.6.4 The chuck part of the Mo-1 vertical frit bar shall be cut off.
4 Test method
4.1 The chemical analysis method of the product is carried out in accordance
with the provisions of GB/T 4325 (all parts).
4.2 The density measurement of the product shall be carried out in accordance
with the provisions of GB/T 3850.
4.3 The grain size determination of the product’s cross-section shall be carried
out in accordance with the provisions of GB/T 6394.
4.4 The product size and shape shall be measured by the tools of
corresponding precision.
4.5 The appearance quality of the product shall be inspected visually.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The product shall be inspected by the supplier, to ensure that the product
meets the requirements of this standard; meanwhile the product quality
certificate shall be filled in.
5.1.2 The purchaser shall inspect the received product in accordance with the
6 Marking, packaging, transportation, storage and
quality certificate
6.1 Marking
The outer packaging of the product shall indicate: the supplier’s name, product
name and designation, specifications, batch number, net weight.
6.2 Packaging
The product is packed in wooden or carton outside; packed in grooved foam
board or moisture-proof paper inside. If there are special requirements, they
shall be negotiated and determined by both parties.
6.3 Transportation
When the product is transported, it shall be protected from moisture and severe
collision.
6.4 Storage
The product shall be stored in a ventilated, dry and acid-free atmosphere to
prevent oxidation.
6.5 Quality certificate
Each batch of products shall be accompanied by a product quality certificate,
which shall indicate:
a) The name and address of the supplier;
b) Product name, designation, specification;
c) Batch number;
d) Net weight;
e) Number of this standard;
f) Analytical testing results and the mark of the quality supervision
department;
g) Date of inspection.