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)

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

 

Clause 10

2

(a) Correctness of
bolt holes

100% from each lot

 

Clause 12

 

(b) Dimensions and
weight

20% of Fish plates
selected at random

 

Clause 12

3

Fitment checks

3% from each lot

 

Clause 13.2

4

Chemical

composition

2 Nos. from each
lot

 

Clause 4.9

5

Tensile strength,

yield strength
& %

age Elongation

2 Nos. from each
lot

 

Clause 7.1

6

Bend Test

2 Nos. from each
lot

 

Clause 7.2

6

Hardness

3% from each lots

 

Clause 7.3

7

Macrostructure

1No. from each lot

 

Clause 7.4

8

Grain size

1 No. from each lot

 

Clause 7.5

 (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.

            c)    Convertor’s valid RDSO approval, invoice of Quantity
supplied along with test certificates of Fish Plate Bar manufacturer.

            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.

 

 

 

 

 

Clause No. 10

 

2.   

 

Correctness
of Bolt holes

 

 

The hole shall be
clean and without burrs on either side

 

 

 

 

Dimensional
checking with RDSO approved

Nipple Gauges
only.

 Clause 13.1

3.   

 

Dimensional

(mm)

As per dimension
sheet enclosed.

 

 

Clause No. 12

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.

 

Clause No. 12.4

 

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.

 

 

 

Clause No. 13.2

 

 

 

 

 

 

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

Clause No. 4.9

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

 

IS
1500-1983

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.

 

IS
11371-1985

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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