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Swansea tribology centre
Swansea Tribology Centre
Lubrication-free underground train doors
The University College of Swansea has decided that the Swansea Tribology Centre will continue after the initial DT1 support period ends in September 1972. It is recognised, however, that as a commercial operation the Centre must continue to cover its costs by means of its income from industry. During recent months the Centre has had a surge of new business, and £37 000 of new contracts were negotiated between November 1971 and June 1972. This is almost double the rate which is needed for financial stability, and is very significantly higher than the rate prior to the recession in 1971. Among the new contracts are projects for Pilkington Brothers Limited and British Rail, and a second contract from Trinity House Lighthouse Service, as well as retainers from the Strip Mills Division of British Steel Corporation and BP Chemicals International Limited. A recent Government survey has shown that the net benefits from its work to some of its clients during the first three years of operation were well over £125 000.
Strips of ptfe fluorocarbon resin filled with carbon, are now being fixed to the 'slippers' on underground train doors, after trials on a number of cars. The slippers are guides at the top of each door. The doors, being arched, are not suspended but guided at the top and supported on rollers running on flat tracks at the bottom. Prior to the conversion to filled ptfe, the doors were lubricated with grease, or oil. Oil would occasionally run down the inside of the doors and soil passengers' clothing. The fluorocarbon bearing has reduced door operation failures and the new door slippers are expected to run for three years without attention. The average car runs 80 000 km (50 000 miles) per year, with the doors operating more than 75 000 times.
Swansea Tribology Centre, University College of Swansea, Singleton Park, Swansea, Glamorgan SA2 8PP, England
A tungsten carbide powder has been developed that can be flame sprayed to produce a tough, wear-resistant coating on a component made from some other material. The powder, called Metco 35C, is a blend of tungsten carbide cobalt aggregate with a cobalt base self-fluxing alloy. Metco say that materials such as stainless steels, highly hardenable steels and tool steels can be successfully coated. After spraying, the coating is fused by torch, furnace or induction heating~ Deposit rates of 8 m2/h for a coating 0.1 mm thick (345 ft /h/0.001 in thick) are possible. Normal coating thickness would be about 0.5 mm (0.02 in) although coatings 1.5 mm (0.060 in) thick have been applied. Evaluation of the coating on sleeves in hot oil pumps after 1500 hours' service at 650°C under oil pressures of 34 bar (500 lbf/in 1) showed no wear.
Wear resistant steel plate A range of wear resistant steel plates with the brand name Red Diamond are being produced by the Redheugh Iron and Steel Company. The steels were developed with the aid of the Department of Mining Engineering at the University of Newcastle upon Tyne. Some of the properties of the steels are given in Table 1. Redheugh Iron and Steel Co Ltd, Teams, Gateshead, Co Durham, England
Table 1 Properties Grade
10
198
Tungsten carbide coatings
Metco Ltd, Chobham, Woking, England
of Red Diamond wear resistant steels
Composition
Hardness
[%1
[HB]
0.45 C 1.75 Mn
255
293
11
1.15 C
277
311
14H 14S
0.60 1.50 1.15 12.5
350 270
375 290
Mn Cr C Mn
20H 20S
0.25 C 0.75 Mn 1.00 Cr 0.20 Mo
250-270 200-235
21
0.40 0.75 1.10 0.25 0.40 0.60 1.50 1.25 0.30
352
22
Du Pont Company (United Kingdom) Limited, 18 Bream's Buildings, Fetter Lane, London EC4, England
C Mn Cr Mo C Mn Ni Cr Mo
40l
311-352
TRIBOLOGY October 1972
Comments
A carbon manganese steel control rolled to give good wear properties at an economic price. Suitable in applications involving moderate wear by gouging and high stress grinding abrasion. A high carbon, chromium steel suitable for use in conditions undergoing wear by low and high stress scratching abrasion (e.g. cement slurry). The main disadvantage is lack of ductility. An Mn steel with excellent wear properties in gouging abrasion, which is used extensively for liners in ore-carrying chutes and hoppers, cutting teeth, etc. Supplied in two grades, 14H which is skin hardened to enhance wear resistance with some loss of ductility and 14S for the best combination of wear resistance and ductility. An alloy steel giving moderate wear properties with good ductility, at an economic price. Suitable in applications involving moderate wear by gouging and high stress grinding abrasion. Supplied in two grades, 20H with higher wear resistance and lower cost but with some loss in ductility, and 20S with a good combination of wear resistance and ductility. A hardened and tempered alloy steel with very good wear resistance to gouging and high stress grinding abrasion.
A hardened and tempered alloy steel with very good wear resistance to gouging and high stress grinding abrasion, moderate ductibility and good impact resistance.
Lubrication-free underground train doors
The University College of Swansea has decided that the Swansea Tribology Centre will continue after the initial DT1 support period ends in September 1972. It is recognised, however, that as a commercial operation the Centre must continue to cover its costs by means of its income from industry. During recent months the Centre has had a surge of new business, and £37 000 of new contracts were negotiated between November 1971 and June 1972. This is almost double the rate which is needed for financial stability, and is very significantly higher than the rate prior to the recession in 1971. Among the new contracts are projects for Pilkington Brothers Limited and British Rail, and a second contract from Trinity House Lighthouse Service, as well as retainers from the Strip Mills Division of British Steel Corporation and BP Chemicals International Limited. A recent Government survey has shown that the net benefits from its work to some of its clients during the first three years of operation were well over £125 000.
Strips of ptfe fluorocarbon resin filled with carbon, are now being fixed to the 'slippers' on underground train doors, after trials on a number of cars. The slippers are guides at the top of each door. The doors, being arched, are not suspended but guided at the top and supported on rollers running on flat tracks at the bottom. Prior to the conversion to filled ptfe, the doors were lubricated with grease, or oil. Oil would occasionally run down the inside of the doors and soil passengers' clothing. The fluorocarbon bearing has reduced door operation failures and the new door slippers are expected to run for three years without attention. The average car runs 80 000 km (50 000 miles) per year, with the doors operating more than 75 000 times.
Swansea Tribology Centre, University College of Swansea, Singleton Park, Swansea, Glamorgan SA2 8PP, England
A tungsten carbide powder has been developed that can be flame sprayed to produce a tough, wear-resistant coating on a component made from some other material. The powder, called Metco 35C, is a blend of tungsten carbide cobalt aggregate with a cobalt base self-fluxing alloy. Metco say that materials such as stainless steels, highly hardenable steels and tool steels can be successfully coated. After spraying, the coating is fused by torch, furnace or induction heating~ Deposit rates of 8 m2/h for a coating 0.1 mm thick (345 ft /h/0.001 in thick) are possible. Normal coating thickness would be about 0.5 mm (0.02 in) although coatings 1.5 mm (0.060 in) thick have been applied. Evaluation of the coating on sleeves in hot oil pumps after 1500 hours' service at 650°C under oil pressures of 34 bar (500 lbf/in 1) showed no wear.
Wear resistant steel plate A range of wear resistant steel plates with the brand name Red Diamond are being produced by the Redheugh Iron and Steel Company. The steels were developed with the aid of the Department of Mining Engineering at the University of Newcastle upon Tyne. Some of the properties of the steels are given in Table 1. Redheugh Iron and Steel Co Ltd, Teams, Gateshead, Co Durham, England
Table 1 Properties Grade
10
198
Tungsten carbide coatings
Metco Ltd, Chobham, Woking, England
of Red Diamond wear resistant steels
Composition
Hardness
[%1
[HB]
0.45 C 1.75 Mn
255
293
11
1.15 C
277
311
14H 14S
0.60 1.50 1.15 12.5
350 270
375 290
Mn Cr C Mn
20H 20S
0.25 C 0.75 Mn 1.00 Cr 0.20 Mo
250-270 200-235
21
0.40 0.75 1.10 0.25 0.40 0.60 1.50 1.25 0.30
352
22
Du Pont Company (United Kingdom) Limited, 18 Bream's Buildings, Fetter Lane, London EC4, England
C Mn Cr Mo C Mn Ni Cr Mo
40l
311-352
TRIBOLOGY October 1972
Comments
A carbon manganese steel control rolled to give good wear properties at an economic price. Suitable in applications involving moderate wear by gouging and high stress grinding abrasion. A high carbon, chromium steel suitable for use in conditions undergoing wear by low and high stress scratching abrasion (e.g. cement slurry). The main disadvantage is lack of ductility. An Mn steel with excellent wear properties in gouging abrasion, which is used extensively for liners in ore-carrying chutes and hoppers, cutting teeth, etc. Supplied in two grades, 14H which is skin hardened to enhance wear resistance with some loss of ductility and 14S for the best combination of wear resistance and ductility. An alloy steel giving moderate wear properties with good ductility, at an economic price. Suitable in applications involving moderate wear by gouging and high stress grinding abrasion. Supplied in two grades, 20H with higher wear resistance and lower cost but with some loss in ductility, and 20S with a good combination of wear resistance and ductility. A hardened and tempered alloy steel with very good wear resistance to gouging and high stress grinding abrasion.
A hardened and tempered alloy steel with very good wear resistance to gouging and high stress grinding abrasion, moderate ductibility and good impact resistance.