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Standard Practices for Sampling Ferroalloys and Steel Additives for Determination of Chemical Composition
Automaticky přeložený název:
Standardní postupy pro odběr vzorků slitin železa a oceli přísady pro stanovení chemického složení
NORMA vydána dne 15.12.2015
Označení normy: ASTM E32-15
Poznámka: NEPLATNÁ
Datum vydání normy: 15.12.2015
Kód zboží: NS-632727
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
chemical composition, ferroalloys, sampling, steel additives ,, ICS Number Code 77.040.30 (Chemical analysis of metals),77.100 (Ferroalloys)
Significance and Use | ||||||
4.1 These practices for the sampling of ferroalloys and steel additives are primarily intended to test such materials for compliance with compositional specifications. It is assumed that all who use these methods will be trained samplers capable of performing common sampling procedures skillfully and safely. |
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1. Scope | ||||||
1.1 These practices include procedures for the sampling of the various ferroalloys and steel additives, either before or after shipment from the plants of the manufacturers. They are designed to give results representative of each lot that will be comparable with the manufacturer's guaranteed analysis for the same lot. For check analysis, the purchaser may use any sampling procedure he desires, but the analytical results obtained on such samples shall not be a basis for complaint or rejection, unless the procedure followed is of an accuracy equivalent to that prescribed in these methods. 1.2 In sampling ferroalloys and steel additives, serious errors often occur from contamination of the samples by iron from the sampling appliances. Therefore, special precautions should be observed to avoid this source of error. Metallic iron may be removed with a magnet from nonmagnetic alloys; its estimation in other alloys requires special analytical procedures (Note 1). To avoid this error, parts of crushers and pulverizing equipment contacting the samples shall be of steel or other material showing a high resistance to abrasion of the type involved. Note 1: Metallic iron in ferrochromium and ferrosilicon may be
determined as follows: Transfer 5 g of the sample of alloy to a
150-mL beaker, add 25 mL of HNO3 (1 + 3), cover, boil 5 min,
filter into a 250-mL beaker, and wash with hot water. Add
NH1.3 The values stated in SI units are to
be regarded as the standard. The inch-pound values in parenthesis
are given for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||
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