GB/T 32930-2016 PDF English
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Microcrystalline cemented carbide rod
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GB/T 32930-2016: PDF in English (GBT 32930-2016) GB/T 32930-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 72
Microcrystalline cemented carbide rod
ISSUED ON: AUGUST 29, 2016
IMPLEMENTED ON: JULY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Requirements ... 4
4 Test methods ... 8
5 Inspection rules ... 8
6 Marks, packaging, transport, storage and quality certificate ... 9
7 Contents of contract (or order sheet) ... 10
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 Non-ferrous Metal of Standardization Administration of China (SAC/TC 243).
Main drafting organizations of this Standard: Xiamen Jinlu Special Alloy Co.,
Ltd., Xiamen Tungsten Industry Co., Ltd. (Technology Center)
Main drafters of this Standard: Zhang Shouquan, Fan Zhirui, Liao Wenting,
Chen Chengyi, Jiang Yuanxiang, Nie Hongbo, Zhu Guirong.
Microcrystalline cemented carbide rod
1 Scope
This Standard specifies requirements, test methods, inspection rules, marks,
packaging, transport, storage, contents of quality certificate and contract (or
order sheet) for microcrystalline cemented carbide rod.
This Standard is applicable to microcrystalline cemented carbide rod of which
the average grain size of tungsten carbide (WC) is greater than or equal to 0.3
μm and less than 0.8 μm in cemented carbide.
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 5242, Check rules and test methods of cemented carbide products
GB/T 5243, Marking packing transport and storage of cemented carbide
products
3 Requirements
3.1 Product classification and schematic
3.1.1 Product classification
Product, according to dimensional accuracy, is classified into blank rod and
finely-ground rod.
3.1.2 Product schematic
See Figure 1 for product schematic.
Figure 1 -- Product schematic
3.2 Chemical composition
Product’s chemical composition is determined by supplier and purchaser. It is
guaranteed by supplier.
3.3 Organizational structure
3.3.1 Product’s WC average grain size, porosity, non-combined carbon,
macroscopic pores shall comply with the provisions of Table 1.
Table 1
WC average grain
size /µm Porosity
Non-combined
carbon
Macroscopic pores
(>25μm~175μm)/(pieces/cm2)
0.3~< 0.8 ≤A02B00 C00 0
3.3.2 When purchaser has requirements for product’s other organizational
structure, it shall be determined by supplier and purchaser via negotiation.
3.4 Mechanical properties
3.4.1 Product’s Rockwell hardness, bending strength shall comply with the
provisions of Table 2.
Table 2
Rockwell hardness (HRA) Bending resistance strength Rbm/(N/mm2)
≥91.3 ≥3600
3.4.2 When purchaser has requirements for product’s other mechanical
properties, it shall be determined by supplier and purchaser via negotiation.
3.5 Dimensions and tolerances, shape tolerances
3.5.1 See Table 3 for diameter tolerances of blank rod.
mm
Table 3
mm
3.5.2 See Table 4 for diameter tolerances of finely-ground rod.
Table 4
mm
3.5.3 See Table 5 for length tolerances of blank rod.
Table 5
mm
3.5.4 See Table 6 for straightness of blank rod.
Diameter D Allowable diameter tolerance of blank rod
Diameter D Allowable diameter tolerance of finely-ground rod
Length L Allowable length tolerance of rod
Table 6
mm
3.5.5 See Table 7 for straightness of finely-ground rod.
Table 7
mm
3.5.6 See Table 8 for rod’s roundness.
Table 8
mm
3.6 Appearance quality
3.6.1 Defects such as peeling, bubbling, blisters, delamination, cracks,
adhesives are not allowed on surface of blank rod.
3.6.2 See Table 9 for allowable lengths, widths, depths of blank rod’s
circumferential chip, arris defect.
Diameter D Length L
Diameter D
Length L
Diameter of blank rod D Roundness of blank rod Diameter of finely-ground rod D Roundness of finely-ground rod
Table 9
mm
3.6.3 On surface of finely-ground rod, there shall be no defects such as notch,
chromatic aberration, scratch.
3.6.4 Surface roughness Ra of finely-ground rod shall not exceed 0.2 µm or be
determined by supplier and purchaser via negotiation.
3.7 Other
When purchaser has other requirements for product, it shall be solved by
supplier and purchaser via negotiation.
4 Test methods
4.1 Product’s organizational structure, mechanical properties are in accordance
with GB/T 5242 or determined by supplier and purchaser via negotiation.
4.2 Use measuring tools of corresponding accuracy to measure product’s
dimensions and tolerances, shape tolerances.
4.3 Visually inspect product’s appearance quality. Use measuring tools of
corresponding accuracy to measure.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 Product is inspected by supplier who shall ensure product complies with
provisions of this Standard and contract (or order sheet) and fill in product’s
quality certificate.
5.1.2 Purchaser shall inspect received product according to the provisions of
this Standard. If inspection results fail to comply with this Standard and contract
(or order sheet), it shall propose to supplier within 3 months since product is
received. It shall be solved by supplier and purchaser via negotiation. When
arbitration is required, sampling for arbitration shall be conducted by supplier
and purchaser at purchaser’s site.
Diameter of blank rod D
Lengths, widths of circumferential chip,
arris defect
Depths of circumferential chip, arris
defect
5.2 Batching
Product shall be submitted for inspection in batches. Each batch of products
shall be composed of products of same chemical composition, of same
specification, of same category.
5.3 Inspection items and sampling
Inspection items and sampling of each batch of products shall comply with the
provisions of Table 10.
Table 10
Inspection item Sampling quantity Sub-clause No. required
Sub-clause No. of
test method
Organizational structure In accordance with GB/T
5242
3.3 4.1
Mechanical properties 3.4 4.1
Dimensions and tolerances,
shape tolerances Piece by piece 3.5 4.2
Appearance quality Piece by piece 3.6 4.3
5.4 Determination of inspection results
5.4.1 When inspection results of product’s organizational structure, mechanical
properties fail, it shall conduct double sampling to re-test rejected items. If one
repeated test result still fails, this batch of products shall be determined as
rejected.
5.4.2 When product’s dimensions and tolerances, shape tolerances are
inspected as rejected, this piece shall be determined as rejected.
5.4.3 When product’s appearance quality is inspected as rejected, this piece
shall be determined as rejected.
6 Marks, packaging, transport, storage and quality
certificate
6.1 Product’s marks, packaging, transport and storage are in accordance with
the provisions of GB/T 5243.
6.2 Product quality certificate
Each batch of products shall be provided with quality certificate, indicating:
a) supplier’s name, address;
b) product name;
c) product lot number;
d) product’s net weight or quantity;
e) inspection results of each item and technical supervision department
imprint;
f) inspection date.
7 Contents of contract (or order sheet)
Contract (or order sheet) shall contain the following information:
a) product name;
b) technical requirements;
c) product net weight or quantity;
d) reference to this Standard;
e) other.
__________ END __________
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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