YS/T 492-2021Element Additive for aluminum and aluminum alloys (English PDF)

4.1 Designation representation method

Additive designations are represented by English letters followed by two digits and element symbols. The English letters represent the type of additive; the two digits represent the nominal content of the main element; the element symbol represents the main element of the additive. Additives are divided into three types, according to flux type.

4.2 Designation, name, category, dimensions, typical illustrations

4.2.1 See Table 1 for the designation, name, category, overall dimensions of the

additives.

a Potassium fluoroaluminate in the flux will increase the fluorine content in the aluminum slag.

4.2.2 Typical illustrations of additives are as shown in Figure 1 and Figure 2.

Figure 1 -- Illustration of round cake additives

Figure 2 -- Illustration of special-shaped additives

4.2.3 When the buyer requires other designations, it shall be determined through negotiation between the supplier and the buyer; it shall be specifically noted in the order form (or contract).

6.1 Chemical composition

6.1.1 Aluminum type additives

The chemical compositions of aluminum type iron, aluminum type manganese, aluminum type copper, aluminum type chromium, aluminum type titanium, aluminum type nickel additives shall comply with the requirements in Tables 2 ~ 7, respectively.

6.1.2 Other additives

6.1.2.1 The main element content in the chemical composition of potassium

fluoroaluminate type and mixed type additives shall be controlled within ±3% of the nominal content.

6.2 Moisture

The moisture content of the additive shall not be greater than 0.2%.

6.3 Density

The density of round cake additives shall comply with the requirements in Table 8.

6.4 Casting yield efficiency

6.5 Anti-fall performance

After the drop test of round cake aluminum type additives, the weight loss shall not exceed 3%.

6.6 Fracture organization

There shall be no particle aggregates and inclusions in the additive fracture organization.

Typical illustrations are as shown in Figures 3 ~ 5.

6.7 Powder content

The content of round cake aluminum type additive powder shall not exceed 1%; it shall not exceed 3% for other types.

7.1 Chemical composition

7.1.1 The analysis method for the main element content of additives shall comply with the provisions of Appendix B ~ Appendix G.

7.1.2 The analysis method for the fluorine content of aluminum additives shall be determined, through negotiation between the supplier and the purchaser. The analysis method for the content of other impurity elements shall comply with the provisions of

Appendix H.

7.1.4 The rounding off comparison method is used to determine the analytical value.

The numerical rounding rules are in accordance with the provisions of GB/T 8170.The rounding digits are consistent with the limit digits in Tables 2 ~ 7 of this document.

7.2 Moisture

The moisture content of additives shall be determined according to the method specified in Appendix I.

7.3 Density

7.3.1 Weigh the mass of the specimen, recorded it as ma.

7.3.2 Measure the diameter of the specimen, recorded as D. Measure the thickness of the specimen, recorded as T.

7.4 Casting yield efficiency

7.4.1 Casting yield

The casting yield of additives is measured according to the method specified in

Appendix J.

7.4.2 Casting yield curve

The casting yield curve is measured according to the method specified in Appendix K.

7.5 Anti-fall test

7.5.1 Weigh the mass of the specimen, recorded as mb. Drop it freely to the cement floor at a height of 1.0 m. Select the largest block. Weigh the mass of the largest block, recorded as mc.

7.5.2 Calculate the mass loss G of the specimen according to formula (2); the value is expressed in %.

7.7 Powder content

7.7.1 Take a specimen. Remove the packaging. Weigh the total mass of the specimen, recorded as md. Weigh the mass of the powder, recorded as me.

7.7.2 Calculate the powder content A, according to formula (3); the value is expressed in %.

8.1 Inspection

8.1.1 The additives shall be inspected by the supplier, to ensure that the product quality complies with the provisions of this document and the order form (or contract);

meanwhile a quality certificate shall be filled out.

8.3 Weighting

Products shall be checked by weight.

8.4 Inspection classification

Product inspection is divided into exit-factory inspection and regular inspection.

8.5 Inspection items

8.5.1 Exit-factory inspection and regular inspection items shall comply with the provisions of Table 10.

8.5.2 The supplier shall conduct regular inspection, at least once every six months.

8.6 Sampling

Additive sampling shall comply with the provisions of Table 11.

8.7 Judgment of inspection results

8.7.1 When the chemical composition of any sample is unqualified, it shall take double quantity of samples from the batch of products (including the batch of products represented by the unqualified sample) for repeated testing. If all repeated test results are qualified, the batch of products will be deemed qualified. If there are still samples that are unqualified in the repeated test results, the batch of products will be deemed unqualified.

8.7.5 When the anti-fall performance of any sample fails to meet the standard, it shall take double quantity of samples from the batch of products (including the batch of products represented by the unqualified sample) for repeated testing. If all repeated test results are qualified, the batch of products will be deemed qualified. If there are still sample fractures that are unqualified in the repeated test results, the batch of products will be deemed unqualified.

8.7.6 When the fracture of any sample fails to meet the standard, it shall take double quantity of samples from the batch of products (including the batch of products represented by the unqualified sample) for repeated testing. If all repeated test results are qualified, the batch of products will be deemed qualified. If there are still sample fractures that are unqualified in the repeated test results, the batch of products will be deemed unqualified.

8.7.8 When the appearance quality of any sample is unqualified, it shall take double quantity of samples from the batch of products (including the batch of products represented by the unqualified sample) for repeated testing. If all repeated test results are qualified, the batch of products will be deemed qualified. If there are still samples that are unqualified in the repeated test results, the batch of products will be deemed unqualified.

9.1 Signs

9.1.1 Product signs

Print the following content identification on the products that have passed the inspection (OR affix a label containing the following content).

9.1.2 Packing box signs

The packaging box signs of additives shall comply with the requirements of GB/T 3199.

9.2 Packaging

Additives should be packaged in kraft paper or aluminum foil. The color identification of packaging materials is distinguished, according to the type of additives. The specific color identification shall comply with the provisions of Table 12.

9.4 Quality certificate

Each batch of additives shall be accompanied by a product quality certificate, stating.

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