GB/T 38970-2020 English PDF (GBT38970-2020)

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.

GB/T 38970-2020
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;