ISO 20202-2004 pdf free.Carbonaceous materials used in theproduction of aluminium — Cold andtepid ramming pastes — Preparation ofbaked test pieces and determination ofloss on baking.
This International Standard describes a method of baking green test specimens made by compactingcarbonaceous ramming pastes.Ilt includes the baking procedure (heating rate and holding time) and thedetermination of the loss on baking (relative mass loss).
Baked test specimens of ramming paste need to be prepared for the determination of properties after baking.for instance apparent density,crushing strength and porosity.The following referenced documents are indispensable for the application of this document. For datedreferences,only the edition cited applies.For undated references,the latest edition of the referenceddocument (including any amendments) applies.
The following referenced documents are indispensable for the application of this document. For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
ISo 4955,Heat-resisting steels and alloys.
ISO 5725-2,Accuracy (trueness and precision) of measurement methods and results —Part 2: Basic methodfor the determination of repeatability and reproducibility of a standard measurement method
ISO 14422,Carbonaceous materials used in the production of aluminium — Cold ramming pastes — Methodsof sampling
ISO14427，Carbonaceous materials used in the production of aluminium — Cold and tepid rammingpastes — Preparation of unbaked test specimens and determination of apparent density after compaction.ASTM E 220,Standard Test Method for Calibration of Thermocouples by Comparison Techniques.
Compacted test specimens of carbonaceous ramming paste are baked in a furnace by raising the temperatureat a specified rate to 1 000 °C and holding the temperature at this value for 2 h. The mass of each testspecimen is measured before and after baking and the loss on baking calculated.
Furnace, e.g. an electrically heated mufle furnace or chamber furnace, with a temperature-controlfacility enabling it to meet the requirements given in Clause 6.Baking container with cover,capable of holding the test specimens and made from heat-resistantsteel (e.g.X15CrNiSi2521 steel as specified in ISO 4955).The distance between the test specimens andbetween the test specimens and the container walls shall not be less than 10 mm.An example of a suitablecontainer is shown in Figure 1.ISO 20202 pdf download.