GB/T 38977-2020Nanometer grain cemented carbide rod (English PDF)
纳米晶硬质合金棒材
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
July 21, 2020
Implementation date
June 1, 2021
Scope
GB/T 38977-2020 is the English-translated version of 纳米晶硬质合金棒材.
GB/T 38977-2020 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.
Clause 1 limits it to nanometer grain cemented carbide rod in which the average grain size of wolfram carbide (WC) in the cemented carbide is not greater than 200 nm, called 'rod' in the rest of the text.
Its eight clauses are Scope; Normative References; Classification, Model Representation Rules and Schematic Diagram of Rods; Technical Requirements; Test Methods; Inspection Rules; Marking, Packaging, Transportation, Storage and Quality Certificate; and Order Sheet (or contract) Content.
Clause 3 divides rods by dimensional accuracy into rough rod products and finished rod products and gives the model representation rules, that for rough rod products being composed of a rod blank code (B), a diameter value (D), a length value (L) and an additional information code.
Clause 5 assigns the dimensions, allowable deviations and shape tolerances to measuring tools of corresponding precision, the metallographic structure and mechanical properties to GB/T 5242 or to negotiation between the demand-side and the supply-side, and the appearance quality to visual inspection or measuring tools, with the surface roughness checked by roughness standard block comparison or by a roughness meter.
Clause 6 covers inspection by the supply-side and re-inspection by the demand-side, which must raise a non-conformity within 3 months from the date of receipt, the composition of a batch from products of the same chemical composition, specification and category, the inspection items and sampling of Table 11, and the rules for declaring a product or a batch disqualified, including a repeated test on double size specimens for metallographic structure and mechanical properties.
Clause 7 refers marking, packaging, transportation and storage to GB/T 5243 and lists the eight entries of the product quality certificate, from the supply-side name and address to the serial number of the standard, while clause 2 cites GB/T 5242 and GB/T 5243.
The draft jumps from the example in 3.2.1 to 5.2 and then breaks off at the end of clause 7, so the technical requirements of clause 4 and the content of clause 8 are not shown.
The page does not state that it replaces an earlier edition; it was issued on July 21, 2020 and has applied since June 1, 2021.
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Document preview — GB/T 38977-2020
National Standard of the People's Republic of China
- ICS
- 77.160
- Classification
- H 72
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Classification, Model Representation Rules and Schematic Diagram of Rods4
- 4 Technical Requirements5
- 5 Test Methods9
- 6 Inspection Rules10
- 7 Marking, Packaging, Transportation, Storage and Quality Certificate11
- 8 Order Sheet (or contract) Content12
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.
5 Test Methods
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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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 5242-2017 — Inspection rules and test methods of cemented carbide products
GB/T 5243-2020 — Marking,packing,transport and storage of cemented carbide products
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