GB 5149.1-2004Magnesium and magnesium alloy powder (English PDF)

4.1 Designation Method

4.1.1 Method for designating milling magnesium powder grades

4.1.1.1 The grade of milling magnesium powder is represented by 3 English letters, 2 to 4 Arabic numerals, and then 1 English letter.

4.1.1.2 The first three letters of the grade name, "FMX", are the identification code for milling magnesium powder.

4.1.1.3 The last 2 to 4 Arabic numerals of the identification code represent the maximum aperture of the sieve selected for the sieve test.

4.1.1.4 The last letter of the grade designation is a difference identifier. When the maximum aperture of the sieve selected for the sieve analysis is the same, the particle size distribution is different.

Powders with different bulk densities (or loose density). Examples are as follows.

Example.

4.1.2 Method for designating atomized magnesium powder grades

4.1.2.1 The grade of atomized magnesium powder is represented by 3 English letters, 2 to 4 Arabic numerals, and then 1 English letter.

4.1.2.2 The first three letters of the brand name, "FMW", are the identification code for atomized magnesium powder.

4.1.2.3 The last two to three Arabic numerals of the identification code represent the maximum aperture (see Example 1) or median aperture (see Example 2) of the sieve selected for the sieve test.

Example 2).

4.1.2.4 The last letter of the grade designation is a difference identifier. When the maximum aperture of the sieve selected for the sieve analysis is the same, the particle size distribution is different.

Powders with different bulk densities (or loose density). Examples are as follows.

Example 1.

Example 2.

4.1.3 Designation Method for Ball Milled Aluminum-Magnesium Alloy Powder

4.1.3.1 The grade of ball milled aluminum-magnesium alloy powder is represented by 4 English letters, 2 to 3 Arabic numerals, and then 1 English letter.

4.1.3.2 The first four letters of the grade name, "FLMQ", are the identification code for ball milled aluminum-magnesium alloy powder.

4.1.3.3 The last 2 to 3 Arabic numerals of the identification code represent the maximum aperture of the sieve selected for the sieve test.

4.1.3.4 The last letter of the grade designation is a difference identifier. When the maximum aperture of the sieve selected for the sieve analysis is the same, the particle size distribution is different.

Powders with different bulk densities (or loose density). Examples are as follows.

4.2 Categories, Grades and Typical Uses

Table 1 shows the types, grades, and typical uses of magnesium powder. If the buyer requires other types or grades, this shall be determined through negotiation between the supplier and the buyer before ordering.

Please specify in the form.

5.1 Particle size distribution, median diameter, and loose packing density

5.1.1 The particle size distribution and loose packing density of milled magnesium powder shall conform to the provisions of Table 2.

5.1.2 The particle size distribution, median diameter (D50), and bulk density of the atomized magnesium powder shall conform to the specifications in Table 3.The particle size distribution and median diameter in the table...

(D50) Two indicators, the buyer can only choose one of them when placing an order.

5.1.4 If the buyer has special requirements for particle size distribution, median diameter and loose packing density, the requirements shall be determined through negotiation between the supplier and the buyer and noted in the purchase order.

5.2 Chemical composition

5.2.1 The chemical composition of milling magnesium powder shall conform to the provisions of Table 5.

5.2.2 The chemical composition of atomized magnesium powder shall conform to the provisions of Table 6.

5.2.4 If the buyer has other requirements for the chemical composition, the supplier and the buyer shall negotiate and determine them, and indicate them in the purchase order.

5.3 Moisture

The moisture content (mass fraction) of milled magnesium powder and ball-milled aluminum-magnesium alloy powder should not exceed 0.2%, and the moisture content (mass fraction) of atomized magnesium powder should also be...

No more than 0.1%.

5.4 Hydrochloric acid insoluble content

The hydrochloric acid insoluble content (mass fraction) of milled magnesium powder and atomized magnesium powder should not exceed 0.2%.

5.5 Passivation performance

Milled magnesium powder used as a desulfurizing agent in steelmaking should undergo passivation treatment. The passivation process shall be determined through negotiation between the supplier and the buyer. The product after passivation treatment...

The performance of the product shall conform to the specifications in Table 8.If the buyer has passivation requirements for other magnesium powders, the supplier and the buyer shall agree on the terms and indicate them in the purchase order.

5.6 Appearance Quality

5.6.1 Magnesium powder produced by milling is in the form of silvery-white/gray flakes. Magnesium powder produced by milling and pulverizing is in the form of granules.

5.6.2 The atomized magnesium powder is in the form of spherical particles, and is silvery-white or silvery-gray in color.

5.6.3 The ball-milled aluminum-magnesium alloy powder is an irregular polyhedron in shape, and is silvery-white or silvery-gray in color.

5.6.4 Magnesium powder should be free of foreign inclusions and lumps that are difficult to sieve due to powder particle adhesion. Trace amounts are permissible in ball-milled aluminum-magnesium alloy powder.

Powder lumps.

5.6.5 The magnesium powder after passivation treatment should have a dense coating, but a small amount of passivation powder is allowed, and the color should be grayish-white.

6.1 Particle size distribution, median diameter, and loose packing density

6.1.1 The particle size distribution and median diameter (D50) of magnesium powder were determined according to the method in Appendix B.

6.1.2 The bulk density of magnesium powder shall be determined according to the method in Appendix C.

6.2 Chemical composition

6.2.1 The determination of aluminum content in magnesium powder shall be carried out in accordance with the method of GB/T 13748.1.

6.2.2 The determination of iron content in magnesium powder shall be carried out in accordance with the method of GB/T 13748.9.

6.2.3 The determination of chloride ion content in magnesium powder shall be carried out in accordance with the method of GB/T 13748.18.

6.2.4 The determination of silicon content in magnesium powder shall be carried out in accordance with the method of GB/T 13748.9.

6.2.5 The determination of copper content in magnesium powder shall be carried out in accordance with the method of GB/T 13748.2.

6.2.6 The determination of the content of active magnesium and active metals (Al Mg) in magnesium powder shall be carried out in accordance with the method in Appendix D.

6.2.7 The method for determining the carbon content in magnesium powder shall be determined through negotiation between the supplier and the buyer and shall be specified in the purchase order.

6.3 Moisture

The moisture content in magnesium powder was determined according to the method in Appendix E.

6.4 Content of hydrochloric acid insoluble matter

The determination of the hydrochloric acid insoluble content in magnesium powder shall be carried out according to the method in Appendix F.

6.5 Passivation performance

6.5.1 Active magnesium content

The determination of active magnesium content shall be carried out according to the method in Appendix D.

6.5.2 Chloride ion content

The chloride ion content was determined according to the method in GB/T 13748.18.

6.5.3 Loose packing density

The loose density was determined according to the method in Appendix C.

6.5.4 Angle of Repose

The angle of repose was determined according to the method of YS/T 56.

6.5.5 Ignition Point

Place 10g of passivated magnesium powder in a tray and put it into an oven or a high-temperature furnace with a viewing window. Turn off the oven or furnace and...

Turn on the power and start heating. Observe the changes in the magnesium powder. When it starts to burn, read the displayed temperature. This temperature is the ignition point.

6.5.6 Flame retardant time

After heating the high-temperature furnace to 1000°C±2°C, quickly open the furnace door and place the tray containing 10g of passivated magnesium powder into the high-temperature furnace within 5 seconds.

Open the furnace, quickly close the furnace door, start timing, and observe the changes in the magnesium powder. When it begins to burn, stop timing; this time is the flame-retardant time.

6.6 Appearance Quality

The appearance quality of magnesium powder is inspected visually.

7.1 Inspection and Acceptance

7.1.1 The supplier shall inspect the products to ensure that the product quality meets the requirements of this document and the purchase order, and fill out a quality certificate.

7.1.2 The buyer shall inspect the received products in accordance with the provisions of this document. If the inspection results do not conform to the provisions of this document or the purchase order, the buyer shall...

Objections should be submitted to the supplier in writing and resolved through negotiation between the supplier and the buyer. Objections concerning appearance quality and particle size distribution (or median diameter) should be submitted within [timeframe missing].

Objections must be raised within one month of the product's issuance date. Objections concerning other performance aspects must be raised within three months of receiving the product. For arbitration, please contact [relevant authority/organization].

The sampling was conducted by a unit recognized by both the supplier and the buyer, and samples were taken jointly by the buyer.

7.2 Batching

7.2.1 Magnesium powder shall be submitted for acceptance in batches, and each batch shall consist of magnesium powder of the same grade. The batch weight of atomized magnesium powder and ball-milled aluminum-magnesium alloy powder shall not exceed the specified limit.

More than 5000kg.

7.2.2 Milling magnesium powder requiring passivation should be produced from the same batch of magnesium ingots, with 5000kg constituting one inspection batch. Batches less than 5000kg are also acceptable.

An inspection batch.

7.2.3 If the buyer has special requirements for the batch weight, they can negotiate with the supplier and indicate them in the order form.

7.3 Inspection Items

7.3.1 Before each batch of milled magnesium powder and atomized magnesium powder leaves the factory, particle size distribution (or median diameter), loose packing density, chemical composition, moisture content, and hydrochloric acid content shall be tested.

Inspection of insoluble content and appearance quality.

7.3.2 Each batch of ductile aluminum-magnesium alloy powder shall be inspected for particle size distribution, chemical composition, moisture content and appearance quality before leaving the factory.

7.3.3 The frequency of testing for the angle of repose, ignition point, and flame retardant time of magnesium powder after passivation treatment shall be determined through negotiation between the supplier and the buyer, or as required by the purchase order.

Conduct an inspection.

7.4 Sampling

7.4.1 For each batch of products, sampling and fractionation shall be carried out according to the provisions of GB/T 5314.The samples shall be mixed thoroughly and reduced to at least 250g using the quartering method.

Two equal portions of the sample.

7.4.2 Place two samples into separate dry, sealed containers. One sample is for testing and analysis, and the other is to be stored in the laboratory for 6 months for arbitration.

For analysis purposes.

7.5 Judgment of Test Results

7.5.1 When the test results for particle size distribution, median diameter (D50), loose density, hydrochloric acid insoluble content, angle of repose, ignition point, or flame retardant time are inconsistent...

If the requirements of this document are met, double the number of samples shall be taken from the batch for repeated testing of the items that do not comply with the requirements of this document.

If the re-inspection results still do not meet the requirements of this document, the batch of powder shall be deemed unqualified. However, with the mutual agreement of both parties, each piece may be inspected individually, and those that pass the inspection shall be deemed unqualified.

delivery.

7.5.2 If the chemical composition does not conform to the provisions of this document, the batch of products shall be deemed unqualified.

7.5.3 If the moisture content does not meet the requirements of this document, the batch of products shall be deemed unqualified.

7.5.4 If the appearance quality does not meet the requirements of this document, the batch of products shall be deemed unqualified.

8.1 Marking

8.1.1 Mark each bucket (bag) with ink that is not easily faded.

a) Name of the manufacturer;

b) Product Name;

c) Brand;

d) Batch number;

e) Gross weight and net weight;

f) This document number;

g) Production date;

h) The words "flammable" and "moisture-proof" are included;

i) Dangerous goods signs, the size, color and usage of the signs shall comply with the provisions of GB 190.

8.2 Packaging

8.2.1 Magnesium powder shall be packaged in steel drums or cardboard drums lined with moisture-proof plastic bags. Milling magnesium powder may also be packaged in woven bags. Woven bags should not...

Static electricity is generated.

8.2.2 The packaging drums are fully open. They have undergone stacking tests, drop tests, airtightness tests, and hydraulic tests according to GB 12463.

Only qualified products can be used, and the body and lid of the packaging barrel should not have sharp burrs or be damaged.

8.2.3 The lid of the packaging drum shall be secured with a horizontally convex locking ring or a galvanized bolt locking ring. A horizontally convex locking ring shall be used.

When necessary, pins should be added for securing. Rubber gaskets should be added to the lids of metal packaging drums, and the drums should be inspected for both sealing and appearance.

8.2.4 After the magnesium powder is filled, the bag opening should be tied and sealed.

8.2.5 If the buyer has other requirements for packaging, the supplier and the buyer shall negotiate and specify them in the purchase order.

8.3 Transportation and storage

8.3.1 Magnesium powder should be transported using hazardous chemical transport vehicles, and the transport vehicles should be protected against static electricity and no source of ignition should be allowed near them.

8.3.2 Magnesium powder should not be transported with acids and is prohibited by small boats. During loading and unloading of drums, impacts and inversions are prohibited. Palletized transport is required upon request.

When transporting, wooden or plastic pallets should be used, and the pallets and steel drums should be secured together with steel or plastic straps.

8.3.3 Magnesium powder should be stored in a well-ventilated, dry warehouse.

8.3.4 The glass windows of warehouses storing magnesium powder should be white-coated to prevent direct sunlight. Explosion-proof electrical appliances should be used for warehouse lighting, and lightning protection devices should be installed.

Storage. Oxidizing agents, acids, chlorine, fluorine, and other halogens, as well as substances that react with each other, are not permitted in the warehouse.

8.4 Accompanying Documents

Each batch of products should be accompanied by a product quality certificate (to ensure the validity of relevant inspection documents, the quality certificate may not be provided with the products).

(for supply), with a note on it.

a) Name of the manufacturer;

b) Product Name;

c) Brand;

d) Batch number;

e) Number of pieces and net weight;

f) All analytical and testing results and the supplier's quality inspection department's stamp;

g) This document number;

h) Manufacturing date.