FISH PLATES 52 KG / 60 KG FOR ONE METRE LONG, IR Specification T-1 – 2012(PROVISIONAL) & RDSO DRG Nos:T-5915(52Kg)&T-5916 (60Kg)
1. Specification /Drawing : IR Specification T-1
– 2012(PROVISIONAL) & RDSO DRG
Nos:T-5915(52Kg)&T-5916
(60Kg)
2. Date of
Inspection :
3. Place of
Inspection :
4. Size of lot :
5. Size of sample :
1000 nos.
or part thereof rolled from one cast and normalized together shall constitute a
lot. Samples for various test as
under:
|
S. No. |
Parameter |
Number
of samples per
lot |
No.
of Samples taken |
Number
of samples to be taken as per : |
|
1 |
Visual Examination |
100% from each lot |
|
|
|
2 |
(a) Correctness of
bolt holes |
100% from each lot |
|
|
|
|
(b) Dimensions and
weight |
20% of Fish plates
selected at random |
|
|
|
3 |
Fitment checks |
3% from each lot |
|
|
|
4 |
Chemical composition |
2 Nos. from each
lot |
|
|
|
5 |
Tensile strength, yield strength
& % age Elongation |
2 Nos. from each
lot |
|
|
|
6 |
Bend Test |
2 Nos. from each
lot |
|
|
|
6 |
Hardness |
3% from each lots |
|
|
|
7 |
Macrostructure |
1No. from each lot |
|
|
|
8 |
Grain size |
1 No. from each lot |
|
(to be checked by the inspector)
6. Document Check:
a)
Valid RDSO approval for manufacture of fish plate.
b)
RITES Inspection certificate for fish plate
bars.
d)
Internal/External test certificate of
chemical composition and mechanical properties as per inspection and test plan
for manufacture of fish plate.
e) Register for the quantity/no of fishplates manufactured
in each shift, with the cast
Numbers, the date manufactured.
f)
PO wise record of
dispatches/accountal of fish plate in line with (d) above.
g)
Internal dimensional check report of fish
plate and manufacture chemical check record.
h) Calibration record of gauges, measuring
instruments & test equipment.
i)
RDSO approval for
templates/gauges.
7. Tests/Checks
(to be witnessed by inspector)
|
S
No |
Parameter |
Value Specified |
Observation
|
Remarks
|
|
1. |
Visual |
· Uniform
section throughout, Straight & smooth on all bearing surfaces. · Sound
and free from twist, blisters, flaws, fins, cracks and any other defect. · Bolt
hole shall be chamfered to remove sharpness of edges of bolt holes. |
|
|
|
2. |
Correctness
of Bolt holes |
The hole shall be
clean and without burrs on either side |
|
Dimensional
checking with RDSO approved Nipple Gauges
only. |
|
3. |
Dimensional (mm) |
As per dimension
sheet enclosed. |
|
|
|
4. |
Nominal Weight |
The nominal weight
of fish plates if mentioned on their approved drawings. Wherever, the nominal
weight is not available, it shall be considered as being the average weight
of 100 parts manufactured to the dimensions given in the approved drawing
till such time the same is made available. |
|
|
|
5. |
Fitment Check |
3% of lot/pairs to be checked for fitment by bolting to two
specified rail sections to check the fit. Fit of fish plates shall be tested
by attempts to insert small feeler
gauges of size not exceeding 0.5mm between fishing angles of fish plates and
rails. |
|
|
|
S
No |
Parameter |
Value Specified |
Observation
|
Remarks
|
|
6. |
Chemical Composition Of
material |
C = 0.40 to 0.50 % + /- 0.03 Si =
0.15 to 0.35 % +/- 0.03 Mn= 0.60
to 0.90 % +/- 0.04 P = 0.04 % (max) +0.005 S = 0.04 % (max) +0.005 |
|
Sample
to be taken from the location as specified in Spec Clause No. 4.9 |
|
7. |
Physical
tests. |
(a)
UTS = 620 Mpa (min) (b)
Yst = 320 Mpa (min) (c)
Elongation=15 % (min) |
|
Clause 7 of spec T-1-2012 IS 1608 -1995 Sample
to be taken from the location as specified in Spec |
|
8. |
Bend
Test 120
Deg. |
Should
pass the test |
|
The finished fish plates to be bent between the bolt holes without
fracturing or showing any signs of crack on the outside when observed
visually and by dye penetration. |
|
9. |
Hardness |
175
(BHN) Min |
|
The test shall be Performed on central portion of outer surface of the fish plate. |
|
10. |
Macrostructure |
The
macrostructure of the steel on the etched transverse section shall be free
from harmful shrinkage, porosity, blow holes, laminations, cracks, non-
metallic inclusions, cavities, dendrites etc. |
|
|
|
11. |
Grain
size |
Grain
size shall be 6 of Finer. |
|
|
|
12. |
Marking |
· Firm’s
initials as approved by RDSO, the two digits of the month and last two digit
of the year of manufacture of the fishplate bar and heat no. · These
markings except heat no. of letters/digits shall be rolled at least
15mm in height and 1mm above the surface at the bottom of non-fishing side of
fishplate bar at the spacing not exceeding 400mm centre to centre of the
identification mark. · The heat
no. can be hot stamped. · All
marking must be clear of nuts and bolt holes |
|
|
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