GB 5149.1-2004 Magnesium powder Part 1: Milling magnesium powder

This part specifies the requirements, test methods, inspection rules, packaging, marking, transportation, storage and contract content of magnesium powder. This part applies to magnesium powder produced by milling method for use as pyrotechnic agent, and magnesium powder produced by milling and crushing method for use as desulfurization agent and pyrotechnic agent in steelmaking. GB 5149.1-2004 Magnesium powder Part 1: Milled magnesium powder GB5149.1-2004 Standard download decompression password: www.bzxz.net

ICS 77. 120.20
National Standard of the People's Republic of China
GB 5149.1—2004
Replaces GB5149—1985
Magnesium powder-- Part 1 : Milling magnesium powderPromulgated on 2004-05-08
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2004-10-01
6.2, 6.5 and 6.6 of this part are mandatory, and the rest are recommended. This part is Part 1 of GB5149.
This part is a revision of GB5149—1985 "Magnesium powder". GB5149.1—2004
This revision mainly adds the corresponding content of magnesium powder produced by milling and crushing method for steelmaking desulfurization agent and pyrotechnic agent. This revision does not change the brand and requirements of magnesium powder in the original standard. The revised content covers the content of GB5149-1985.
This part replaces GB5149-1985 from the date of implementation. This part is proposed by China Nonferrous Metals Industry Association. This part is under the jurisdiction of the National Technical Committee for Standardization of Nonferrous Metals. The responsible drafting units of this part are: China Nonferrous Metals Industry Standardization and Quality Research Institute, Northeast Light Alloy Co., Ltd. The participating drafting units of this part are: Beijing Tongzhou Xinlihua Magnesium Powder Co., Ltd., Henan Nanyang Great Wall Group Magnesium Powder Co., Ltd., Wuhan Hanming New Technology Development Co., Ltd., Henan Hebi Jianghai Smelting Co., Ltd. The main drafters of this part are: Ma Cunzhen, Zhu Yuhua, Fan Shunke, Shi Guangfu, Song Xiaohui, Zhang Ge, Li Jianzhou, Tan Zhongsheng. This part is interpreted by the National Technical Committee for Standardization of Nonferrous Metals. The previous versions replaced by this part are: GB5149-1985.
1 Scope
Magnesium powder Part 1
Milled magnesium powder
GB 5149.1-2004
This part specifies the requirements, test methods, inspection rules, packaging, marking, transportation, storage and contract content of magnesium powder. This part applies to magnesium powder produced by milling method for use as pyrotechnic agent, and magnesium powder produced by milling and crushing method for use as desulfurization agent and pyrotechnic agent in steelmaking.
2 Normative references
The provisions of the following documents become the provisions of this part through reference to this part of GB5149. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this part. GB/T4107 Determination of bulk density of magnesium powder Scott volumetric method Determination of particle size composition of magnesium powder and aluminum-magnesium alloy powder Dry sieving method GB/T 4108
GB/T4374 (all parts) Chemical analysis method of magnesium powder and aluminum-magnesium alloy powder YS/T56 Determination of natural slope angle of metal powder 3 Requirements
3.1 Brand
Magnesium powder produced by milling method is divided into five brands, as shown in Table 1. Magnesium powder produced by milling and comminution method is divided into six brands, as shown in Table 2. The particle size, bulk density and chemical composition of magnesium powder shall comply with the provisions of Table 1 and Table 2 respectively. Table 1 Magnesium powder produced by milling method
Screen aperture/
—180
Mass fraction
Not more than/%
Bulk density
Not less than/
(g/cm3）
Active magnesium content
Not less than
Chemical composition/%
Impurities, not more than
Hydrochloric acid insoluble matter
Note 1: The number of the screen aperture is the basic size of each side of the mesh, that is, the nominal screening particle size of the screen. "+" indicates the material on the sieve, and "-" indicates the material under the sieve. Note 2: The magnesium powder listed in this table is mainly used as pyrotechnic agent. Note 3: When the user has special requirements, it shall be determined by negotiation between the supply and demand parties and indicated in the contract. 1
GB5149.1-2004
Sieve mesh aperture/
—200
—200
—200
Mass fraction
Not more than/%
Table 2 Magnesium powder produced by milling and crushing method
Loose density
Not less than/
(g/c m°)Www.bzxZ.net
Active magnesium content
Not less than
Chemical composition/%
Impurities, not more than
Hydrochloric acid insoluble matter
Note 1: The numbers of the mesh aperture are the basic dimensions of each side of the mesh, that is, the nominal screening particle size of the mesh. "Ten" represents the material on the sieve, and "two" represents the material under the sieve. Note 2: The magnesium powder listed in this table is mainly used as a desulfurizer and pyrotechnic agent for steelmaking. Note 3: When the user has special requirements, it shall be determined by negotiation between the supply and demand parties and shall be indicated in the contract. 3.2 Passivation treatment
Magnesium powder used as a desulfurizer for steelmaking needs to be passivated The passivation process is determined by the supply and demand parties through negotiation. However, it should be ensured that the magnesium content after passivation is not less than 92.0%, the ignition point is not less than 560°C, the flame retardant time at 1000°C is not less than 15S, and the natural slope angle is not greater than 30%
3.3 Appearance quality
3.3.1 The magnesium powder particles produced by the milling method are rhombus-shaped and silvery white. 3.3.2 The magnesium powder particles produced by the milling and crushing method are shaped like irregular spheres. It is silvery white before passivation. It is grayish white after passivation. 3.3.3 The magnesium powder should be free of foreign inclusions and agglomerates. The magnesium powder after passivation should be coated Dense, but a trace amount of passivation layer powder is allowed. 4 Test method
The particle size of magnesium powder shall be determined according to the method specified in GB/T4108. 4.1
4.2 The bulk density of magnesium powder shall be determined according to the method specified in GB/T4107. 4.3 The chemical composition of magnesium powder shall be determined according to the method specified in GB/T4374. 4.4 The appearance quality of magnesium powder shall be inspected by visual method. 4.5 The determination method of the ignition point of magnesium powder shall be determined by negotiation between the supply and demand parties and shall be indicated in the contract. 4.6 The determination method of the flame retardant time of magnesium powder shall be determined by negotiation between the supply and demand parties and shall be indicated in the contract. GB 5149.1--2004
4.7 The determination of the natural slope angle of magnesium powder shall refer to the method specified in YS/T56, or it may be determined by negotiation between the supplier and the buyer, and shall be indicated in the contract.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The magnesium powder shall be inspected by the supplier's quality inspection department and shall be guaranteed to comply with the provisions of this part, and a product quality certificate shall be attached. 5.1.2 The buyer may re-inspect the received products in accordance with the provisions of this part. If the re-inspection results do not comply with the provisions of this part or the order contract, the buyer shall submit the matter to the supplier within three months from the date of receipt of the product, and the supplier and the buyer shall negotiate to resolve the issue. During arbitration, the supplier and the buyer shall jointly take samples at the buyer's side.
5.2 Batches
Magnesium powder shall be submitted for acceptance in batches, and each batch shall consist of magnesium powder of the same brand. The batch weight shall be determined by negotiation between the supplier and the buyer, and shall be indicated in the contract.
5.3 Inspection Items
Each batch of products shall be inspected for particle size, bulk density, chemical composition and appearance quality before leaving the factory. After the magnesium powder is passivated, the inspection of ignition point, flame retardant time and natural slope angle shall be determined by negotiation between the supply and demand parties. 5.4 Sampling
5.4.1 10% of the number of barrels or bags of each batch of magnesium powder shall be sampled (but not less than 2 barrels (bags)) for inspection. Use a sampling shovel or sampling needle to take samples from the upper, middle and lower parts of each barrel (bag). Mix the samples carefully and reduce them to a mass of not less than 500g by quartering. 5.4.2 Divide the sample into two equal parts, one for inspection and analysis; the other is sealed in a tightly sealed container and handed over to the laboratory for six months for arbitration analysis.
5.5 Determination of test results
When the test results do not meet the requirements of this section, double the number of barrels (bags) of the batch shall be retested for the items that do not meet the requirements of this section. If the retest results still do not meet the requirements of this section, the batch shall be judged as unqualified. However, each barrel (bag) can be tested and only qualified ones will be delivered. 6 Packaging, marking, transportation, and storage
6.1 Magnesium powder shall be packaged in aluminum barrels, iron barrels or woven bags lined with plastic bags. After the magnesium powder is packed, the bag mouth shall be tied and sealed. The gross weight of the barrel and the gross weight of the bag shall be negotiated by the supply and demand parties and shall be indicated in the contract. 6.2 The aluminum barrel or iron barrel shall be sturdy and sealed. The inner surface of the packaging barrel made of black iron sheet shall be coated with aluminum powder and the outer surface shall be painted. The woven bag shall be sturdy, durable and able to prevent static electricity.
6.3 On each barrel (bag), use non-fading pigments to indicate: supplier name, trademark;
b) brand;
c) batch number;
d) gross weight and net weight;
part number;
date of production;
"flammable", "moisture-proof".
6.4 Each batch of products should be accompanied by a product quality certificate, indicating: supplier name, address;
b) product name;
GB 5149.1—2004
brand;
batch number;
number of pieces and net weight;
various analysis and test results and the supplier's quality inspection department stamp; this part number,
date of factory ex-factory (or packaging date).
5 Magnesium powder must be transported in boxcars or containers, and the transport vehicles must be protected against static electricity. No fire is allowed to approach. 6.5
Magnesium powder should be stored in a ventilated and dry warehouse. 6.6
Contract content
The order form (or contract) for the products listed in this part shall include the following: a) Product name;
b) Brand;
c) Net weight;
d) Matters required to be "specified in the contract" in this part; e) Part number;
Consultation results when adding content outside this part. 0
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