WCA July 2012

UTS, MPa

UE, %

TE, %

Nt

Nb

Base

2106

1.1

2.1

41

12

B

2096

1.3

2.4

42

11

High B

2087

1.4

2.5

41

9

❍ ❍ Table 4 : Tensile properties Ultimate Tensile Strength (UTS), Uniform Elongation (UE), and Total Elongation (TE) of the wires drawn to 1mm after patenting

UTS, MPa

UE, %

TE, %

Nt

Nb

Base

2263

0.4

1.5

35

11

B

2283

0.4

1.5

36

10

High B

2257

0.4

1.5

36

8

❍ ❍ Table 5 : Tensile properties Ultimate Tensile Strength (UTS), Uniform Elongation (UE), and Total Elongation (TE) assessed following aging at 150 ºC for one hour of the wires drawn to 1mm after patenting

Limited effect of boron alloying was apparent at the investigated nitrogen levels on wire properties in particular torsional ductility. Reduced ultimate tensile strength was observed in the High B steel. Acknowledgements The International Wire & Machinery Association Educational Trust Fund is gratefully acknowledged for financial support as well as The Timken Company for supplying the laboratory prepared steels. The support of the sponsors of the Advanced Steel Processing and Products Research Centre, an industry/ university cooperative research centre at the Colorado School of Mines is gratefully acknowledged. 1. R.J. Glodowski, “Nitrogen strain aging in ferritic steels”, Wire Journal Intl. , pp. 70-75, Jan. 2005. 2. B. Yalamanchili, J.B. Nelson, P.M. Power and D. Lanham, “North Star Steel Texas’s experience with boron additions to low-carbon steel”, Wire Journal Intl. , pp. 90-94, Nov. 2001. 3. B. Yalamanchili, P.M. Power and D. Lanham, “A technical review of industrial practices for decreasing the strain hardening rate of low carbon steel wire”, Wire Journal Intl. , pp. 108-111, July 2005. 4. I.D. McIvor, “Microalloyed very low carbon steel rod”, Ironmaking and Steelmaking , Vol. 16, No. 1, pp. 55-63, 1989. 5. A.R. Franks and A. Kirkcaldy, “The effect of boron on the properties of electric arc-sourced plain carbon wiredrawing qualities”, Wire Journal Intl. , pp. 100-113, May 1998. 6. B. Marin, A. Bell, Z. Idoyaga, V. Colla and L.M. Fernandez, “Optimisation of the Influence of Boron on the Properties of Steel”, ECSC Technical Steel Research Contract No 7210-PR/355 , 2007. 7. P. Hesse and M. Klemm, “Additions of Boron in High Carbon Wire Rods”, Proc. of the Wire Association International International Conference , Zakopane, Poland, 1999. 8. E. De Moor, D.K. Matlock, P.M. Power, B. Yalamanchili, W. Van Raemdonck, R.J. Glodowski, “Effect of Boron Alloying on the Mechanical Properties of High Carbon Wire Rods”, Proceedings of Interwire 2011, Atlanta, GA, Wire Association International. 9. Ph. Maitrepierre, J. Rofes-Vernis and D. Thivellier, “Structure-Proper- ties Relationships in Boron Steels,” Proc. of the Intl. Symposium on Boron in Steel , eds. S.K. Banerji and J.E. Morral, AIME, Milwaukee, Wi. Sept. 18, 1979, pp. 1-18. 10. D.T. Llewellyn and W.T. Cook, “Metallurgy of Boron-Treated Low-Alloy Steels”, Metals Tech ., Vol. 1, no. 12, 1974, pp. 517- 529. 11. M. Ueda and K. Uchino, “Steel Rail Having Excellent Wear Resistance and Internal Breakage Resistance, and Method of Producing the same,” U.S. Patent 5 830 286, Nov. 1998. References

12. E. De Moor, D.K. Matlock, W. Van Raemdonck, B. Yalamanchili, P.M. Power, R.J. Glodowski:“Effect of Boron Alloying on Austenite Decomposition in 0.80C Wire Rod Grades”, Proc. of the Intl.Tech. Conf. of the Wire Association Intl ., Monterrey, Mexico, 18-20 Oct. 2010, pp. 1-6 .

Advanced Steel Processing and Products Research Centre Colorado School of Mines 1500 Illinois Street Golden, CO 80401, USA Tel : +1 303 273 3025 Fax : +1 303 273 3016 Email : info@aspprc.mines.edu Website : www.aspprec.mines.edu

NV Bekaert SA President Kennedypark 18 BE-8500, Kortrijk Belgium Tel : +32 562 305 11 Fax : +32 562 305 43 Website : www.bekaert.com

55

Wire & Cable ASIA – September/October 2007 Wir & Cable ASIA – July/August 12