YS/T 1004-2014Molten aluminum and aluminum alloys (English PDF)

3.4 Slag Inclusion

The molten aluminum produced by the remelting method shall be tested for slag inclusion. The limited content of slag inclusion shall be specified in the order sheet (or contract) after being determined through negotiation between the demand-side and the supply-side.

4.1 Molten Aluminum Produced by the Electrolysis Method

4.1.1 The various electrolysis process parameters shall be reasonably controlled.

4.1.2 Tool protection shall be strengthened, and the operation time of iron tools in the electrolyte shall be shortened as much as possible, so as to avoid excessive melting of impurity elements into the molten aluminum in the electrolytic tank during operation.

4.1.3 The contents of Fe and Si elements in the molten aluminum in the electrolytic tank shall be regularly tested.

4.2 Molten Aluminum and Aluminum Alloys Produced by the Remelting Method

4.2.1 After the aluminum melt is refined and slagged-off, there shall be no visible scum on the surface.

4.2.2 When the raw materials used contain elements, such as: rare earth, Cd, Hg, Pb and Cr6+, it shall be indicated in the accompanying documents.

4.2.3 The melting furnace shall be regularly cleaned.

4.2.4 The raw materials shall be corrosion-free, and shall not be mixed with ice, snow, rain, greasy dirt, mud and other debris, etc.

5.1 Chemical Composition

5.1.1The chemical composition analysis method shall comply with the stipulations of GB/T

20975 or GB/T 7999. The arbitration analysis shall adopt the method specified in GB/T 20975.

5.1.2 The determination of analytical values shall adopt the rounding-off comparison method.

The numerical value rounding-off rules shall be conducted in accordance with the relevant stipulations of GB/T 8170. The rounding-off digits shall be consistent with the chemical composition limit digits specified in the corresponding standards of the designations (as shown in Table 1, GB/T 1196 or GB/T 3190 or GB/T 8733 or GB/T 27677 or YS/T 275 or YS/T 665).

5.2 Temperature

Adopt a temperature measuring instrument with an accuracy of not lower than 1 °C for temperature measurement.

5.3 Slag Inclusion

The test can be carried out by taking the method specified in Appendix B or other methods agreed upon by the demand-side and the supply-side as a reference.

6.1 Inspection and Acceptance

6.1.1 The products shall be inspected by the supply-side to ensure that the product quality complies with the stipulations of this Standard and the order sheet (or contract). In addition, a quality certificate shall be filled in.

6.1.2 The demand-side shall re-inspect the received products in accordance with the stipulations of this Standard. When the re-inspection results are inconsistent with the stipulations of this

Standard and the order sheet (or contract), it shall be submitted to the supply-side in writing, which shall be resolved through negotiation between the demand-side and the supply-side.

Objections related to temperature shall be immediately raised upon receipt of the product, and other objections shall be raised within 3 months from the date of receipt of the product. If arbitration is needed, it can be entrusted to an organization recognized by the demand-side and the supply-side, and the sampling can be jointly conducted at the demand-side’s site.

6.2 Group Batch

The products shall be submitted for acceptance in batches. Each batch of products shall be composed of products of the same designation, the same aluminum ladle or melting furnace.

6.3 Weight

The products shall be checked for weight.

6.4 Inspection Items

6.4.1 Each batch of products shall be inspected for chemical composition (in addition to Cd,

Hg, Pb and Cr6+ elements) and temperature.

6.4.2 Cd, Hg, Pb and Cr6+ should be inspected once a year. When there are special requirements, the inspection period shall be jointly determined by the demand-side and the supply-side, and instrument and conduct a second temperature measurement. If the result of the second temperature measurement is qualified, then, the batch of products shall be determined as qualified; otherwise, the batch of products shall be determined as disqualified.

6.6.3 Slag inclusion

When it is disqualified in the amount of slag inclusion, it is allowed to conduct a second sampling test. If the result of the second test is qualified, then, the batch of products shall be determined as qualified; otherwise, the batch of products shall be determined as disqualified.

7.1 Marking

The following should be marked at an appropriate location of each aluminum ladle:

a) Supply-side’s name;

b) Melting furnace No. or electrolytic tank No.;

c) Designation;

d) Batch No.

7.2 Packaging and Storage

7.2.1 The molten aluminum shall be packaged and stored in aluminum ladles.

7.2.2 The aluminum ladles shall be designed based on capacity and transportation mode, etc.

The design shall prevent the aluminum ladles from leaking when abnormal accidents occur, such as: lifting rod breakage and transportation failure, etc. The aluminum ladles shall include fastening devices to ensure that the aluminum ladles can safely reach the means of transport.

7.2.3 The discharge device of the aluminum ladles and the supporting safety devices shall be compatible with the demand-side’s unloading modes (including the use of a crane or tipping mechanism for dumping and unloading, and the use of the siphon principle for pressure unloading).

7.2.4 The maximum body surface temperature reached by the aluminum ladles cannot cause a significant degradation in the mechanical properties of the aluminum ladles.

7.3 Transportation

7.3.1 Scientific process and technical measures shall be formulated to prevent the splashing of molten aluminum from injuring people.

7.3.2 During transportation, preventive measures shall be taken to prevent the explosion of molten aluminum when it encounters water.

7.3.3 Metallurgical casting cranes shall be used to lift molten aluminum. Personnel engaged in high-temperature operations shall take measures, such as: heat insulation and cooling, to prevent high-temperature injuries.

7.3.4 The ground transportation vehicles for molten aluminum shall be special transportation vehicles and shall be equipped with safety warning and alarm devices.

7.3.5 Vehicles for lifting and transporting molten aluminum shall keep a sufficient safe distance from buildings and are not allowed to collide with other objects or cross other production facilities.

7.3.6 Special vehicles for transporting molten aluminum are not allowed to stay under gas, oxygen and hydrogen pipelines, or in areas with flammable and explosive substances.

7.4 Quality Certificate

Each batch of products shall be accompanied by a quality certificate that complies with the requirements of this Standard, indicating:

a) Supply-side’s name;

b) Product name;

c) Designation;

d) Melting furnace No. or electrolytic tank No.;

e) Batch No.;

f) Net weight;

g) Various inspection results and technical supervision department’s seal;

h) Serial No. of this Standard;

i) Exit-factory date or packaging date.