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O, N determination in steel samples (single graphite crucibles)

閱讀：2775 發布時間：2015-05-15

Suitable analyzers
n ON 900
n ONH 2000
Used accessories
n Graphite crucibles (90190)
n Suitable calibration material (NIST or other)
Settings
n Comparator level: 5 mV (low oxygen);
20 mV (other)
n Minimum time: 15 sec (oxygen);
35 sec (nitrogen)
n Maximum time: 3:00 min
n Post waiting: 20 sec
n Base line deviation: 20 mV;
Step: 16 mV; Time: 10 sec
n Mode: continuous
n Outgas
Time: 45 sec
Power: 5 kW
n Time
Purge: 15 sec
Stability: 45 sec
n Integration delay
IR cell: 2 sec
TC cell: 10 sec
n Analyse (1)
Time: 40 sec
Power (1): 4 kW
Power (2): 4 kW
Sample preparation
Make sure that the surface of the steel is free from
contaminations; otherwise clean the sample with
acetone p.a. and let dry at atmosphere.
Procedure
n Prepare ELTRA analyzer (exchange anhydrone,
sodium hydroxide, copper oxide when necessary),
clean furnace, sample drop mechanism, electrode tip
n Run three blanks with empty crucibles
n Calibrate the analyzer with suitable calibration
material (NIST or other)
(1) Place empty crucible (90190) on the electrode tip,
close furnace (F2 Button)
(2) Weigh calibration material (usually pins)
(3) Place calibration material in the sample
drop mechanism and start analysis (F5 Button)
Repeat steps (1) – (3) at least three times;
Mark the results and use the calibration function in
the software.

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O, N determination in steel samples (single graphite crucibles)

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