Silicon 0. ASTM MNL 7 Manual on Presentation of Data and Control The samples must be sufficiently massive to prevent overheat- Chart Analysis5 ing during the discharge and of a similar metallurgical condi- tion and composition as the reference materials. Terminology 1. The technique method, refer to Terminology E Summary of Test Method correct for interference effects and to compensate for errors 4.
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A number in parentheses indicates the year of last reapproval. This practice is similar to ISO No other units of measurement are included in thisstandard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.
For specificstatements, see 6. Referenced Documents2. Current edition approved Feb. Published March Originallyapproved in Last previous edition approved in as E — Significance and Use4.
Such subjects as sampling location and the sam-pling of lots are defined. Standardanalytical methods that reference this practice need containonly special modifications and exceptions. It is expected that only propersampling equipment will be used.
Hazards and Safety Precautions5. Provisions shall include protective clothing, handprotection, and face visors resistant to splashes of liquid metalfor use during the sampling of liquid metal; protective clothingand hand, eye, and hearing protection for use during thesampling and sample preparation of solid metal; and respira-tory protection for use where necessary. Grinding operations used for surface preparation may becovered by national legislation.
Requirements for Sampling and Sample Preparation6. Special requirements apply to each category of liquidand solid metal, and these requirements are described in therelevant section. Special considerations apply to pig irons see Section In the case of a sample taken from a melt,however, some variability in analysis, both within and betweensamples for analysis, may be unavoidable.
This variability willform an inherent part of the repeatability and reproducibility ofthe analysis. Generally, a massof g will be sufficient for a sample in the form of chips orpowder. In the case of atomic emission and X-ray fluorescencespectrometric methods, the shape and size of the sample will bedetermined by the dimensions of the sample chamber. Thedimensions for samples given in this practice are for guidanceonly.
Refer to Test Method E for sample size requirementsfor atomic emission spectrometry. For pig iron,this shall identify the consignment or part of a consignment andthe increment from which it was taken.
During and after preparation, store thesample in a manner which prevents contamination or chemicalchange. Keep a record of the methods used for preparing samples. Unless agreed to thecontrary, the representatives of each party responsible for thepreparation of samples will keep these containers. Samples can be taken during the casting of themelt to verify chemical composition in accordance with thespecification of the cast product.
In the case of liquid metalintended for the production of a casting, the analytical samplemay be selected from test bars or blocks specially cast from thesame metal as that of the casting for purposes of mechanicaltesting in accordance with the product standard. The sample obtained from a melt usually is in the form of asmall ingot, a cylindrical or rectangular block, or a chill-castdisk or a combination of a disk with one or more attached pins,in some cases small lugs are attached to a disk sample.
NOTE 1—Sampling probes for use with liquid iron and steel may beobtained from a number of suppliers. The main features of the differenttypes of probe are distinguished in Annex A1 and Annex A2, whichinclude dimensions for information only.
ASTM E1806 - 18