The ISO 1811 standard, developed by the International Organization for Standardization (ISO), specifies methods for the selection and preparation of samples for chemical analysis of copper and copper alloys in the form of cast untreated products, unexpected cathodes.
The methods specified in ISO 1811 apply to copper and copper alloys in the form of bulk unprocessed products (refinery shapes) such as cakes, billets, wire rods and ingots, and are intended to determine compliance with chemical composition requirements.
Lot cast blanks: Unless otherwise agreed between the manufacturer and purchaser, for sampling purposes, a large number of cast blanks shall be defined as a particular material produced, such as cakes, billets, wire rods or ingots. from a single blast furnace charge or 24 hour cycle of a continuous smelting furnace. Materials poured in different shapes or sizes and from different furnaces will be considered as a separate batch.
Sampling units from untreated bulk products that are not subject to significant decomposition shall be sampled by fully puncturing through each test piece. Logging and number of holes should be such that it is representative of the sample taken. Cast blanks subject to significant decomposition will have the entire cross-section of each sampling unit sampled by milling. Sampling can also be done by sawing or trimming.
Prior to sampling, sampling units must be clean and free of scale, dirt, oil, grease and other contaminants. If necessary, the sampling units can be cleaned in ethyl ether or acetone, rinsed in ethanol and dried. Scale and dirt can be removed with appropriate mechanical or chemical treatment. If chemical cleaning methods are used, these processes will not alter the metal surface in any way.
Saws, drill bits, cutters or other tools used for sampling should be thoroughly cleaned before use. The sampling rate should be adjusted in such a way that overheating of the sample and consequent oxidation is prevented. Lubricants shall not be used. Carbide-tipped tools are recommended; If steel tools are used, they should be made of magnetic material to aid in the later removal of foreign iron.
Carbide tipped tools will be used for magnetic phase alloys; magnetic cleaning shall not be used. Drilling, milling, sawing or clipping of alloys without a magnetic phase will be carefully processed with a strong magnet to remove any ferrous particles introduced during sampling. Drills, mills, saws or clippings will be carefully inspected and any foreign matter introduced while sampling will be removed.
In certain cases, a full section from a sampling unit may be required for spectrometric examination. Each section must be taken and properly marked before the remainder of the sampling unit is used for other sampling operations.
The gross sample shall be prepared by thoroughly mixing equal masses of drills, mills, saws or scraps from each sampling unit. Milling, drilling, etc. The size of the chips obtained with
The gross sample must weigh at least four times the amount required for the total analysis and be divided into four test samples of equal mass, each to be placed in a container and sealed: one for the manufacturer and one for the buyer. , one for reference if needed, the other as a backup.
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