GB/T 38970-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 38970-2020 | English | 125 |
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Molybdenum and molybdenum alloy powder for addictive manufacturing
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GB/T 38970-2020: Molybdenum and molybdenum alloy powder for addictive manufacturing---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38970-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160;25.030
H 71
Molybdenum and molybdenum alloy powder for
addictive manufacturing
ISSUED ON: JULY 21, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Technical requirements ... 4
4 Test methods ... 6
5 Inspection rules ... 7
6 Marking, packaging, transportation, storage and quality certificate ... 8
7 Order form (or contract) contents ... 10
Molybdenum and molybdenum alloy powder for
addictive manufacturing
1 Scope
This Standard specifies the technical requirements, test methods, inspection
rules and marking, packaging, transportation, storage, quality certificate and
purchase order (or contract) of molybdenum and molybdenum alloy powder for
addictive manufacturing.
This Standard applies to molybdenum and molybdenum alloy powder for
addictive manufacturing.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 1479.1, Metallic powders - Determination of apparent density - Part 1:
Funnel method
GB/T 1480, Metallic powders - Determination of particle size by dry sieving
GB/T 1482, Metallic powders - Determination of flow time by means of a
calibrated funnel (Hall flowmeter)
GB/T 4325, Methods for chemical analysis of molybdenum
GB/T 5162, Metallic powders - Determination of tap density
GB/T 5314, Powders for powder metallurgical purposes - Sampling
GB/T 19077, Particle size analysis. Laser diffraction methods
YS/T 1297, Measuring method for sphericity ratio of titanium and titanium
alloy powders
3 Technical requirements
3.1 Chemical composition
The tap density of the product is measured in accordance with the provisions
of GB/T 5162.
4.5 Liquidity
The fluidity measurement of the product is carried out in accordance with the
provisions of GB/T 1482.
4.6 Appearance quality
The appearance quality of the product is inspected visually.
4.7 Others
The measurement of the sphericity rate shall be carried out in accordance with
the provisions of YS/T 1297, or be determined through negotiation between the
supplier and the buyer. The measurement of the hollow powder rate shall be
determined by negotiation between the supplier and the buyer.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The product shall be inspected by the supplier to ensure that the product
quality complies with the requirements of this Standard and the order form (or
the contract); the supplier shall fill in the quality certificate.
5.1.2 The buyer shall inspect the received products in accordance with this
Standard and the purchase order (or contract). If the inspection result does not
conform to the provisions of this Standard and the purchase order (or contract),
it shall be submitted to the supplier within 45 days from the date of receipt of
the product, and settled by the supplier and the buyer through negotiation.
5.2 Batch
Products shall be submitted for acceptance in batches; each batch shall be
composed of products of the same production process, the same designation,
and the same category.
5.3 Inspection items and sampling
The inspection items and sampling of the product shall meet the requirements
of Table 6.
Table 6 – Inspection items and sampling
c) Designation and category;
d) Production batch number;
e) Particle size range;
f) Net weight;
g) Number of this Standard;
h) "Inflammable", "Dampproof", "Fireproof", "Prevent inhalation" and other
signs.
6.2 Packaging
Products shall be packaged in double-layer vacuum plastic packaging in plastic
bags; or clean plastic barrels or metal barrels shall be used as the container
unit. Use inert gas protection packaging or vacuum packaging. The
environment shall be strictly controlled during the packaging process to avoid
pollution. The product packaging mass is 5 kg; it can also be packaged
according to the buyer's requirements. The packaging container shall ensure
its integrity during transportation, and shall not be damaged, damp, or expose
the product to foreign contaminants.
6.3 Transportation
Products shall be transported in a covered environment. During the
transportation process, it shall be protected from rain and damp; severe
collision and mechanical extrusion are strictly prohibited. The handling process
shall be careful, without upside down; it is strictly forbidden to approach the fire
and fire source.
6.4 Storage
The product shall be sealed and stored in a ventilated and dry place, away from
fire sources. It is strictly forbidden to store it with corrosive substances such as
oxidants, acids, alkalis; avoid direct sunlight.
6.5 Quality certificate
Each batch of products shall be accompanied by a quality certificate, which
indicates:
a) Name of the supplier;
b) Product name:
c) Designation and category;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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