GOVERNMENT OF INDIA MINISTRY OF RAILWAYS - rdso

Page No.1of 7 Specification No. TI/SPC/OHE/CCSBC/0100(07/2010) 

GOVERNMENT OF INDIA 

MINISTRY OF RAILWAYS 

SPECIFICATION FOR 

CONTINUOUS CAST SILVER BEARING 

COPPER WIRE RODS 

Issued by 

RESEARCH DESIGNS AND STANDARDS ORGANIZATION 

MANAK NAGAR, LUCKNOW-226011 

(For official use only) 

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Page No.2 of 7 Specification No. TI/SPC/OHE/CCSBC/0100(07/2010) 

SPECIFICATION FOR CONTINUOUS CAST SILVER BEARING 

COPPER WIRE RODS OF 19.1 mm TO 21.5 mm DAIMETER 

SPECIFICATION NO.TI/SPC/OHE/CCSBC/0100(07/2010) 

Amendment 

number 

Signature 

Date 

designation 

Copy number 

Date of 

Amendment 

Total pages 

including 

annexure 

Prepared by Checked by Approved by 

Issued by………….. signature date……….. 

Issued to…………………………………………………………………………. 

…………………………………………………………………………. 

Note:-this specification is property of RDSO No reproduction shall be done without 

permission from DG(TI),RDSO this specification is not for general use. 

2 

Amendment/Revision 

0 NA First issue


S. No. HEADING PAGE 

1. SCOPE 4 

2. GOVERNING SPECIFICATION 4 

3. MATERIAL 4 

4. FREEDOM FROM DEFECTS 4 

5. TESTS 5 

6. METHOD OF TESTS 5 

7. PACKING 6 

8. MARKING 7 

9. ON THE ROD 7 

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1. SCOPE 

GOVERNMENT OF INDIA: MINISTRY OF RAILWAYS 

RESERCH DESIGNS AND STANDARDS ORGANISATION 

MANAK NAGAR, LUCKNOW-226011 

SPECIFICATION FOR CONTINUOUS CAST SILVER BEARING COPPER WIRE 

1.1. This specification covers the requirements of continuous cast silver bearing copper wire 

rods of 19.1mm to21.5mm diameter for the manufacture of hard drawn grooved 

silver bearing copper contact wire of various sizes to be used on Indian Railways as 

given in table-3 of specification No. TI/SPC/OHE/CW(Cu-Ag)/0100(07/2010).The 

CCSB Copper wire rod shall be manufactured by Southwire process. 

2. GOVERNING SPECIFICATION 

2.1. In the preparation of this specification assistance has been taken from the following 

standards and specification. 

2.1.1. IS: 191(pt-v)-1980 Specification for Copper. 

2.1.2. IS: 9713-1983 Specification for hot rolled electrolytic copper wire 

rods for electrical conductors. 

2.1.3. IS: 440-1964 Methods of Chemical analysis of Copper. 

2.1.4. IS: 1608-1995 or latest Mechanical testing of Metals.. 

3. MATERIAL 

3.1. The material of continuous cast silver bearing copper wire rods when analysed in 

accordance with IS:440-1964, “Methods of Chemical Analysis of Copper:, shall meet the 

requirements specified in the IS:191(Pt-V)-1980, “Specification of Copper”. The oxygen 

content of the wire rod shall not exceed 0.03%. The oxygen content shall be determined in 

accordance with IS: 440-1964, or by any other method with the prior approval of 

Purchaser. 

4. FREEDOM FROM DEFECTS 

4.1. The surface of continues cast copper wire shall be fairly smooth, free from inclusions or 

foregin particles, indentation, surface defects, twists, entanglements etc. 

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Page No. 5 of 7 Specification No. TI/SPC/OHE/CCSBC/0100(07/2010) 

5. TESTS 

5.1. All the test specifications shall be carried out at manufacturer’s Works. The manufacturer 

shall arrange all the necessary machinery, apparatus, labour assistance etc. required for 

conducting these tests without making any claim on the Purchaser. The tests for which the 

facilities are not available at manufacturer’s Works may be carried out at any other reputed 

Laboratory with the prior approval of the purchaser 

5.2. Acceptance Tests:- 

The following tests shall be carried out on the number of wire rods selected from the lot:- 

(i) Visual Examination (Clause 6.1) 

(ii) Measurement of dimensions (Clause 6.2) 

(iii) Compression test (Clause 6.3) 

(iv) Tensile strength / elongation test (Clause 6.4) 

(v) Chemical Composition (Clause 6.5) 

(vi) Microstructure examination (Clause 6.6) 

(vii) Electrical resistivity test (clause 6.7) 

5.3. Sampling and criteria for conformity: 

5.3.1. Sampling and criteria for conformity shall be in accordance with Clause-9 of 

IS: 9713-1983. 

6. METHOD OF TESTS 

6.1. Visual Examination: 

The rods shall be visually examined for defects mentioned in Clause-4 of this specification. 

The rod shall be free from defects. 

6.2. Measurements of Dimensions: 

Discard approximately 2.5 metres length from the end of the coil. Three measurements at 60° 

angular displacement shall be made around the circumference at two places 4 metres apart. An 

average of six readings shall be considered as the diameter of the wire 

rod. The diameter shall be as specified in table-3 of specification No. 

TI/SPC/OHE/CW(Cu-Ag)/0100(07/2010). 

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6.3. Compression test: 

A sample from the coil length twice the diameter of the wire rod shall be cut and then 

compressed till its length becomes half the original length. Curved surface, after test, shall not 

show any crack or defect on visual check. 

6.4. Tensile strength/ elongation test: 

When tested in accordance with IS:1608-1995 or latest, “Mechanical Testing of Metals” for 

tensile strength and elongation , the material shall have a tensile strength of 20.4 kgf /mm 2 

(min.) and a minimum of 46% elongation on a gauge length of 250mm. 

6.5 Chemical Composition: 

The material shall have the chemical composition as given in TABLE-2 of RDSO 

specification No. TI/SPC/OHE/CW(Cu-Ag)/0100(07/2010). The trace elements shall be 

determined by spectrometric method. The copper shall be determined in accordance 

with IS: 440-1964. For oxygen content, certificate from manufacturer of CCSBC wire 

rod shall be furnished. 

6.5.1 The oxygen content of the material shall be less than 300 ppm. 

6.6 Microstructure examination:- 

The sample of wire rod cut along transverse section polished and etched shall show 

equiaxed re-crystallized fine grains having grain size finer than ASTM-5. The presence 

of cast columnar grains in the microstructure shall not be permitted. 

6.7: Electrical Resistivity test:- 

Electrical Resistivity of CCSBC wire rod shall be determined in accordance with IS:613- 

2000.Resistivity shall not be greater than 0.01737 ohm mm 2 /m at 20°C. 

7. PACKING:- 

7.1. The material shall be supplied in coils strapped with loops or as required by the Purchaser. 

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8. MARKING:- 

8.1. On the coil: 

9. On the rod: 

Suitable tags with markings made on them shall be provided with each coil and shall carry the 

following information: 

(i) Name and trade mark of the manufacturer; 

(ii) Size of wire rod, weight and length of coil; 

(iii) Lot Number 

(iv) Date of Manufacturing 

(v) Purchase order number and name of consignee; 

(vi) Date of inspection and inspecting authority; 

(vii) Any other information required by the Purchaser 

The name of the manufacturer and month and year of manufacture shall be provided on the 

wire rod at regular intervals ant exceeding 10 metres to facilitate easy identification 

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GOVERNMENT OF INDIA MINISTRY OF RAILWAYS - rdso

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