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GB/T 38977-2020 English PDF (GBT38977-2020)

GB/T 38977-2020 English PDF (GBT38977-2020)

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GB/T 38977-2020: Nanometer grain cemented carbide rod

This Standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and order sheet (or contract) content of nanometer grain cemented carbide rod. This Standard is applicable to nanometer grain cemented carbide rod, in which, the average grain size of wolfram carbide (WC) in cemented carbide is not greater than 200 nm.
GB/T 38977-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.160
H 72
Nanometer Grain Cemented Carbide Rod
ISSUED ON: JULY 21, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification, Model Representation Rules and Schematic Diagram of Rods ... 4
4 Technical Requirements ... 5
5 Test Methods ... 9
6 Inspection Rules ... 10
7 Marking, Packaging, Transportation, Storage and Quality Certificate ... 11 8 Order Sheet (or contract) Content ... 12
Nanometer Grain Cemented Carbide Rod
1 Scope
This Standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and order sheet (or contract) content of nanometer grain cemented carbide rod. This Standard is applicable to nanometer grain cemented carbide rod, in which, the average grain size of wolfram carbide (WC) in cemented carbide is not greater than 200 nm (hereinafter referred to as ?€?rod?€?).
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 5242 Inspection Rules and Test Methods of Cemented Carbide Products GB/T 5243 Marking, Packing, Transport and Storage of Cemented Carbide Products 3 Classification, Model Representation Rules and
Schematic Diagram of Rods
3.1 Classification
In accordance with the dimensional accuracy, the rods are divided into two categories: rough rod products and finished rod products.
3.2 Model Representation Rules
3.2.1 Rough rod products
The representation of rough rod products is composed of four parts: rod blank code (B), diameter value (D), length value (L) and additional information code, as it is shown in the example.
Example:
accordance with the method determined by the demand-side and the supply-side through negotiation.
5.2 The dimensions, allowable deviations and shape tolerances of the rods shall be tested through measuring tools of corresponding precisions.
5.3 The metallographic structure and mechanical properties of the rods shall be inspected in accordance with the stipulations of GB/T 5242, or shall be determined by the demand-side and the supply-side through negotiation.
5.4 The appearance quality of the rods shall be inspected through visual inspection or measuring tools of corresponding precisions. The surface roughness shall be inspected through roughness standard block comparison method or roughness meter. 6 Inspection Rules
6.1 Examination and Inspection Acceptance
6.1.1 The products shall be inspected by the supply-side, which shall ensure that the products comply with the stipulations of this Standard and the order sheet (or contract). In addition, the product quality certificate shall be filled out.
6.1.2 The demand-side may inspect the received products in accordance with the stipulations of this Standard. When the inspection result does not conform to this Standard and the order sheet (or contract), it shall be submitted to the supply-side within 3 months from the date of receipt of the products, and resolved between the demand-side and the supply-side through negotiation. If arbitration is required, the arbitration sampling shall be jointly carried out by the demand-side and the supply-side on the demand-side?€?s site.
6.2 Batch
The products shall be submitted for inspection in batches. Each batch shall be composed of products of the same chemical composition, the same specification and the same category.
6.3 Inspection Items and Sampling
The inspection items and sampling of each batch of products shall comply with the stipulations of Table 11.
6.4 Determination of Inspection Results
6.4.1 When the inspection results of the dimensions, allowable deviations and shape tolerances of the product are disqualified, then, the product shall be determined as disqualified.
6.4.2 When the inspection results of the metallographic structures and mechanical properties of the products are disqualified, it is allowed to take another double size of specimens for a repeated test on the disqualified items. If there is still disqualification in the results of the repeated test, then, the batch of products shall be determined as disqualified.
6.4.3 When the inspection result of the appearance quality of the product is disqualified, then, the product shall be determined as disqualified.
7 Marking, Packaging, Transportation, Storage and
Quality Certificate
7.1 Marking, Packaging, Transportation and Storage
The marking, packaging, transportation and storage of the products shall comply with the stipulations of GB/T 5243.
7.2 Quality Certificate
Each batch of products shall provide a product quality certificate, which shall indicate: a) Supply-side?€?s name and address;
b) Product name;
c) Product category;
d) Product batch No.;
e) Net weight or quantity;
f) Various inspection results and technical supervision department?€?s imprint; g) Date of inspection;
h) Serial No. of this Standard.

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