168 pages
English

The influence of manufacturing variables of the wear characteristics of hardened steel rolls (works data)

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Industrial research and development

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Nombre de lectures 5
Langue English
Poids de l'ouvrage 3 Mo

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Commission of the European Communities
technical steel research
Mechanical working
THE INFLUENCE OF MANUFACTURING
VARIABLES ON THE WEAR CHARACTERISTICS
OF HARDENED STEEL ROLLS
Report
EUR 11100 EN
Blow-up from microfiche original Commission of the European Communities
technical steel research
Mechanical working
THE INFLUENCE OF MANUFACTURING
VARIABLES ON THE WEAR CHARACTERISTICS
OF HARDENED STEEL ROLLS
- LABORATORY EXPERIMENTAL DATA -
- WORKS DATA -
SHEFFIELD FORGEMASTERS Ltd.
Brightside Lane
GB-SHEFFIELD S9 2RZ
Contract No 7210-EA/806
(1.7.1981 - 31.12.1986)
FINAL REPORT
-owi
Directorate-GeneraI
Science, Research and Development
1988 I/EUR 11100 EN! Published by the
COMMISSION OF THE EUROPEAN COMMUNITIES
Directorate-General
Telecommunications, Information Industries and Innovation
L-2920 LUXEMBOURG
LEGAL NOTICE
Neither the Commission of the European Communities nor any person acting
on behalf of then is responsible for the use which might be made of
the following information
»ECSC-EEC-EAEC, Brussels • Luxembourg, 1988 THE INFLUENCE OF MANUFACTURING
VARIABLES ON THE WEAR CHARACTERISTICS
OF HARDENED STEEL ROLLS
SUMMARY
The main objective of the experimental research programme was to
determine the optimum production route in the manufacture of
forged steel rolls for cold mill applications such that rolls
may be produced with improved and more consistent wear
properties. By the use of a simulated wear test and monitoring
surface characteristics variables in the process route such as
composition and heat treatment have been examined.
On the basis of the results obtained from the programme of work
the following conclusions have been drawn in determining a
satisfactory production route:
1. optimum analysis is a high carbon 3-5% chromium steel.
2. a low hardening temperature consistent with the required
hardenability.
3. electroflux remelting should be utilised. -v
Page
1. INTRODUCTION 1
1.1 Background to Research Programme
1.2 Summary of Intendede 2
2. DETAILS OF THE METALLURGY, PRODUCTION AND USE OF
FORGED STEEL WORK ROLLS
2.1 Metallurgy
2.2 Production 3
2.3 Use 6
3. EXPERIMENTAL METHOD
3.1 Melting and Forging
3.2 Heat Treatment 7
3.3 Shotblast Technique
3.4 Surface Texture 8
3.5 Wear Testing
3.6 Metallographic Examinations , 8
3.7 X Ray Diffraction and Electron Probe Microanalysis 9
4. RESULTS 9
4.1 Investigation into Typical Roll Wear Characteristics
4.1.1 Introduction2 Results and Discussion
4.1.3 Conclusion 10
4.2. Effect of Surface Hardness1
4.2.1 Introduction2t of Tempering Temperature on Surface Hardness 1
4.2.3 Wear Test Data
4.2.4 Discussion2 5 Conclusions3
4.3. Effect of Hardening Temperature 1
4.3.1 Introduction2 Wear Test Data4
4.3.3 Optical Metallography4 Discussion 1
4.3-5 Conclusions
4.4. Effect of Retained Austenite5
4.4.1 Introduction2t of Sub-Zero Treatment on Hardness 1
4.4.3 Wear Test Data
4.4.4 Effect of Sub-Serot on Retained Austenite 1
4.4.5 Discussion6 6 Conclusions
4.5 Effect of Microsegregation
4.5.1 Introduction
4.5.2 Wear Rate Data7
4.5.3 Effect of Homogenisation on Segregation Indices 1
4.5.4 Optical Metallography 15 Discussion
4.5.6 Conclusion
4.6. Effect of Carbide Morphology
4.6.1 Introduction2 Heat Treatment Details8
4.6.3 Wear Test DataVII
4.6.4 X Ray Diffraction 18 5 Metallography 19
4.6.6 Discussion 19 7 Conclusion 19
4.7. Effect of Composition 19
4.7.1 Introduction 19
4.7.2 Effect of Tempering Temperature on Surface Hardness 20 3 Wear Test Data 20
4.7.4 Optical Metallography 20 5 Retained Austenite 20
4.7.6 Discussion 20 7 Conclusions 21
5. DISCUSSION 21
6. CONCLUSION 22
REFERENCES■ 7. 23
Tables
Figures
Appendices