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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. The samples must be sufficiently massive to prevent overheating during the discharge and of a similar metallurgical condition and composition as the reference materials. One or more of the reference asgm must closely approximate the composition of the specimen. The technique of analyzing reference materials along with unknowns and performing the indicated mathematical corrections may also be used to correct for interference effects and to compensate for errors resulting from instrument drift.
A variety of such ast are commonly used. Any of these that will achieve analytical accuracy equivalent to that reported for this test method are acceptable. It is the responsibility of the user of this standard to establish appropriate safety and health practices and atsm the applicability of regulatory limitations prior to use. Current edition approved Jan.
ASTM International – Standard References for ASTM E – 14
Originally approved in Last previous edition approved in as E — 94 Summary of Test Method 4. The radiant energy of selected analytical lines are converted into electrical energies by photomultiplier tubes and stored on capacitors.
The discharge is terminated at a predetermined level of accumulated radiant energy from the internal standard iron line or after a? At the end of the exposure period, the charge on each capacitor is measured, and displayed or recorded as a relative energy or concentration. This procedure is suitable for manufacturing control and inspection testing. The following mold types have been found to produce acceptable samples. The ring is placed on a?
The wall thickness of the mold should be 32 mm 1. The resulting surface should be uniformly plane and free of defects. These may be either wet or dry grinding devices. Grinding materials with grit sizes ranging from 60 to have been found satisfactory.
The stand shall provide an atmosphere of argon and may be water cooled. Electrode and argon are described in 7. Spectrometer characteristics for two of the instruments used in this test method are described as having dispersion of 0.
Spectral lines are listed in Table 1. Automatic sequencing shall be provided to actuate the? Interference corrections will not be necessary if: B Either iron line Equipment varies among laboratories. Reagents and Materials 7. Refer to Practice Zstm These reference materials shall be homogeneous, and free of voids or porosity. A minimum of three reference materials shall be used for each element.
Department of Commerce, Gaithersburg, MD Preparation of Samples 9. Prepare the surface to be analyzed on a suitable belt or disk grinder. Prepare the surface of the specimens and reference materials in a similar manner. If wet surfacing procedure is used, dry the specimens for proper excitation in the argon atmosphere.
Excitation and Exposure Flush, s Preburn, s Integration, s 7 20 20 Argon Flow 0. Make the necessary corrections either by adjusting the controls on the readout or by applying arithmetic corrections. Standardization will w1086 done anytime veri?
ASTM E1086 – 14
If readings are not in conformance, repeat the standardization. Procedure for Excitation and Radiation Measurement Place the freshly surfaced specimen on the excitation stand in a manner to effect a gas-tight seal and adequate argon?
Position the specimen so there will be a uniform pattern of excitations around its face. For example, a disk-shaped specimen should have a ring of excitation marks around its outer edge and approximately 6 mm 0. Avoid the center of cast specimens because there is more chance of quench cracks and segregation. Make a good electrical ground. Cool the specimen after two excitations to prevent overheating, if required. Examine the specimen after each excitation to evaluate the quality of excitation.
Cracks, voids, pits, moisture, or inclusions will limit the sampling and the accuracy of a determination. Successive excitations shall be sufficiently separated so that the discharge patterns do not overlap. Calculation of Results If the readout is not in direct concentration units, use this value to obtain the concentrations from the curves, or related scale values and concentration by reference to a table that has been previously prepared.
F d-c charged Inductance,? Capacitance d-c charged ,? H Resistance, V Potential, V 7. Flush, s Preburn, s Exposure, s 2 10 10 or 15 Argon Flow 0.
Calibration, Standardization, and Veri? There shall be at least three calibrants for each element, spanning the required concentration range. Repeat with different random sequences at least four times. Follow the procedure for the concentration-ratio method in accordance with Practice E E — 94 Precision and Bias 2 The interlaboratory testing was conducted in accordance with Practice E Using reference materials supplied with the unknowns, in-house reference materials, NBS and British Certi?
The precision data for the three unknowns is shown in Table 2. The agreement between the results obtained by chemical methods and those obtained by this test method is displayed in Table 3. These data were obtained by procedures outlined in Practice E This represents a total of 15 determinations.
The results reported by each laboratory are on? The results for each individual laboratory is on? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly asttm that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
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