ISO 13902:1997 pdf free download

07-12-2021 comment

ISO 13902:1997 pdf free download.Steel and iron Determination of high sulfur content Infrared absorption method after combustion in an induction furnace.
ISO 13902 specifies a method for the determination of the sulfur content in steel and iron using an infrared absorption method after combustion in an induction furnace.
The method is applicable to a sulfur content of between 0,10 % (n-im) and 0,35 % (‘rim).
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of ISO 13902. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on ISO 13902 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of lEG and ISO maintain registers of currently valid International Standards.
ISO 565:1990, Test sieves — Metal wire cloth, perforated metal plate and electrotormed sheet— Nominal sizes of openings.
ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions.
ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method.
ISO 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method.
Iso 14284:1996, Steel and iron — Sampling and preparation of samples for the determination of chemical composition.
3 Principle
Combustion of a test portion with accelerator at a high temperature in a high-frequency induction furnace in a current of pure oxygen.
Transformation of sulfur into sulfur dioxide.
Measurement by infrared absorption of the sulfur dioxide carried by a current of oxygen.
4 Reagents and materials
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade.
at the mass. expressed in mllhgrams, of sulfur In the test portion;
m is the mass. expressed in rvIgmms. of sulfur In the bIonIc test (7.3);
in, Is the mass. expressed In mlthgrams, of sulfur fl 0,59 ci pure Iron (4.2), (see 7.4);
m is the mess, In gram., of the lest portion (72).
6.2 PrecIsion
A planned Inst at this method was carried out by 16 laboratories in seven coomtfles, at eight levels at sulfur ntent. each laboratory makIng three determInatlone (see notes 4 and 5) of sulfur content on eaCh level,
4 Two of the three detenseisliane ware caifled out under rep.ay cordlfons deltnd Ii ISO 5725-1; Ia. one operor. earns apparatus. Idenal operataig ccrdxns, urns cratIon, and a mramurn period of tinie.
S The third delermliellori wee carried out at a dilerent tan.(on a ditterent day) by he aeni. cçeralDr te note 4. usIng the same apparatue ‘*øh a new caltaraton,
The teat sarrçles used and mean/preceron results obtained are teted in table 6.1.
The results otAained were treated stalisticafty Wi accordance with ISO 5725. Parts 1 • 2 and 3.
The data obtained showed a logarlthmc relationship between sulfur content and repeatabáty limit (r) and reproductilily llmks (Rand R) of the test rest*s (see note 6) as suninarized In table 2. The grajthica) representation at the data is shown In lipure C.1.
NOTE 6 From th two values obtained on day 1. the repeatabullly (r) and odijclblllty (R) were cakulat.d usaig the procedure ap.cdled m ISO 5725-2. From the I hit value obtied i day I end the vakis obtained on day 2. the wUhinlaboratory reproducthhllly bmlf IR.) was calcuteted usaig the procedure given WI ISO 5725-a
4.1 Oxygen. 99,5% (nVn manimtxn.
It is essenhal that an oxidahcxi catalyst, copper(Il) oxide or platinum for example, In a te heated to a temperature above 450 ‘C te used pflor lo a purifying unit (see annex A). when the presence of organic contamInants Is suspected in the oxygen.
4.2 Pure Won, of a known (or determined by the procedure ven ri 7.4) low sulfur content of less than
0.0005% (ni%
4.3 SuItable solvent apprapnate for washing greasy or duty test samples, for example. acetone
4.4 hlagnes4um perchiorate, .nhydrous. IMg(CIOjj, particle size: Iron, 0.7 mm to 1,2 mm.
4.5 Accelerator, tungsten, free from sulfur, or of a known sulfur content of less than 0.0005% (m’m). NOTE I The mesh size of the accelerator ney be dspndeel on Sie frpe of apparatus used
4.6 Anhy&ou.b.iumsutfat.(mnemumasay9,5%(m’ndnedal 105’ClollO’Cfor3handcooledlna
desiccator before use.
4.7 Inert ceramic (attapulgue clay), Impregnated wifh sodium hydroxide, particle size: from 0.7mm Ia 1,2 mm.
5 Apparatus
During the analysis, unless otherwise slated, us. only ordinary laboratory apparatus.
The apparatus required lot contushon ii a high-frequency induction furnace and the subsequent infrared absorption measurement of the evolved sulfur dioxide rvwy be obtained commercially from a nuuter ci rrisnufacturers. Fallow the meniAacture?s irructiona for the operabon cit the equment.
Features of coninarcial instruments are given in annex &
5.1 Mlcrobalanc., weighing to the n.arest 0,001 mg.
5.2 CeramIc crucible, capable of olthstandlng combuation in an induction furnace.
lgrwte crucible. In an electric furnace in air or in a current of oxygen, for not less than 2 hat 1100 ‘C. and state an a desiccator befor, use.
5.3 Glass-fIbre filter, cut Ia the diameter of the cructie and ignited for 12 h at 450 ‘C.
6 SamplIng and preparation of the test samples
Sampling and preparation of the samples shall be carried out Wi accordance with ISO 14254. The sample for analysis shal be homogerezed before weighing the test portion. Powders can be homogenized by stirring (see clause 9).
7 Procedure
SAFETY INSTRUCTiONS — The dili related to combustion analysle are mainly bums In pr,-lgnhtlng the ceramic crucibles and In the luslon. Use crucible tong. .t all time. and suitable containers I or the used crucible.. Normal precautions for handling oxygen cylinders iliall be taken. Oxygen from the combustion process shall be removed atlactively from the apparatus since a high concentration of oxygen Ins confined spec. can present f li hazard.

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