UDC
669.14
: 643,226
1643,942
)
Second Reprint SEPTEMBER
(
IS:228(Partl4)-1988
1996 )
( Reaffirmed 1994 )
Indian
METHODS PART
14
FOR CHEMICAL
DETERMINATION
OF CARBON
(FOR
I. scope -This steels and alloy
Standard
CARBON
ANALYSIS BY THERMAL
0.005 TO 2.000
OF STEELS CONDUCTIVITY
standard ( Part 14 ) covers a method for determination steels in the range of 0’005 to 2’000 percent.
of Carbon by Thermal
2. Determination
Conductivity
METHOD
PERCENT)
of
carbon
in all
types (
Method
2.1 Oofh’ne offhe MethodThe sample is burnt in a stream of oxygen in presence of a met; accelerator. The carbon dioxide formed is selectively adsorbed on the molecular sieve at a tempera ture apd released by heating at 300°C. The detector is a thermistor cell which senses the differenc# between thermal conductivity of the carrier gas ( with helium specially for extra-ldw carbon, ant oxygen in other cases ) and that of the carrier gas containing carbpn dioxide. This difference i proportional to carbon content of the sample. 3. Reagents 3.1 Oxygen
99’6 percent
( 01) -
3.2 Helium-
99’5 percent
1.3 Ascarite
or Soda-Lime
.4 Magnesium
pure, Min.
pure, Min. -
Perch/orate
0’80 mm-2’0 -
0’80 mm-20
Trap -
containing
,7 Carbon Dioxide
Converter
8 Accelerators
-
coppei,
manganese
dioxide
containing
-
tin or iron granules,
consisting Apparatus - Any analyser blumn and thermistor type detector. -
The
samples shall
Conforming
( MnOt
copper oxide
crucibles of 9 Crucibles -pre-ignited mibustion tube of the induction furnace.
Sampling Standard.
mm.
( rd 7 1’84 ) -
.S Concentrated Sulphuric Acid ulphuric acid ( second revision )‘. .6 Sulphur
mm.
be drawn
maintained
dimensions
induction
and
‘Specification
fo
accommodated
in
).
free from carbon
precise
of
to IS : 263-1977
and sulphur. which
furnace,
prepared
at 300°C.
may
molecular
as prescribed
be
sieve,
in
chromatographic
the
relevant
Indian
6, Procedure
6.1 Standardization 6.1 .I Switch on the stability of the cell.
instrument
6.1.2 Start the flow of purified rate of 1 000 - 1 500 ml/minute.
Adopted
22 December
for 4 hours
oxygen
before
analyzing
gas and pass it
continuously
I
I . BUREAU MANAK
OF BHAVAN.
INDIAN 9 BAHAOUR NEW OELHI
STANDARDS SHAH 110002
through
attaining
the
Gr 1
@ June 1988. BIS
1987
the samples for
ZAFAR
MARG
thermal
system at the
IS : 228
(Part
44 ) - 1988
6.1.3 Transfer into the pre-ignited crucible 1’00 g standard in the range of interest and add 1’0 g accelerator. 6.1.4
Insert
the crucible
into the induction
furnace,
wait
sample which
for 30 seconds
has a value
and start the induction.
6.1.5 Note the percentage carbon, and adjust if necessary, the standardization until value of carbon for the standard sample is obtained and with the desired reproducibility. 6.2
Of carbon
the certified
For Sample
6.2.1 acetone, 6.2.2
Transfer benzene Insert
1 g of accurately weighed sample previQusly washed or ether) thrice and dried at 100&5”C OF the crucible
into the induction
7. Reproducibility
-
furnace
rf, 0’000 2 percent
and proceed or f
until
the percentage
0’5 percent
EXPLANATORY
with organic solvent ( like and add 1’0 g of accelerator.
of carbon
of carbon
present
is read out.
whichever
is greater.
NOTE
The first revision of IS : 228-1959 covered the chemical analysis of plain carbon and low alloy was again revised to make it comprehensive steels along with pig iron and cast iron. This standard in respect of steel analysis and to exclude pig iron and cast iron analysis which is being covered in 8 The second revision of IS : 228 was issued in parts covering chetnical analysis separate standard. of steels. This part ( Part 14 ) covers chemical analysis of ca!bon in steels by thermal conductivity method. Determination of carbon in steels by infra-red combustion .method is being covered in However, determination of carbon in steels by volumetric another part of series of this standard. The other parts and gravimetric methods has been prescribed in Part 1 and Part 4 of this standard. of this series are : Determination of darbon ( Part 1 )-1988 cent ) ( third revision) Determination of ( Part 2 )-1987 method (third revision) ( Part 3 )-1987
Determination
Determination ( Part 4 )-1987 ( third revision ) ( Part 5 )-1987 nickel
Determination > 0’1 percent
by volumetric
manganese
plain
carbon
of phosphorus
by alkalimetric
of
gravimetric
carbon
by
(for
and
method
by persulphate
( Part 7)-1974 Determination of molybdenum 3 1 percent) ( second revision ) Determination ( Part 8 )-1975 (second revision )
of silicon
Determination ( Part 9 )-1975 revision )
of sulphur
by
in plain
carbon
0’05 to 2’50 persteels
( gravimetric oxidation
(for
> 0’1 percent) )
method
method
method
by arsenite
( third revision )
( for carbon
a-bentoinoxime
by the gravimetric
carbon
low alloy
method
of nickel by dimethylglyoxime ) ( third revision )
( Part 6 )-1987 Determination of chromium 3 0’1 percent ) ( third revision )
(
in
method
method (for
( for
chromium
( for molybdenum
silicon
steels by evolution
Z 0’1 percent) method
(second
Part 10 )-1976
Determination of molybdenum by thiocyanate ( photometric) method molybdenum up to 1 percent ) in low and high alloy steels (second revision )
( Part 11 )-1976 Determination of silicon by photometric method in carbon alloy steels ( for silicon 0’01 to 0’05 percent ) (second revision) ( Part 12 J-1976 Determination of manganese by periodate and high alloy steels ( for manganese up to 2 percent ( Part 13)-1982
Determination
)
steels
( photometric ) method ( second revision)
(for
and
low
in low
of arsenic 2 Reprography
Unit,
DIS,
New Delhi,
India