Tribological Aspects of Advanced Roll Material in Cold Rolling of Stainless Steel

Vancron 40, a nitrided powder metallurgical tool
Steel, is used in cold work applications where the predominant failure
mechanisms are adhesive wear or galling. Typical applications of
Vancron 40 are among others fine blanking, cold extrusion, deep
drawing and cold work rolls for cluster mills. Vancron 40 positive
results for cold work rolls for cluster mills and as a tool for some
severe metal forming process makes it competitive compared to other
type of work rolls that require higher precision, among others in cold
rolling of thin stainless steel, which required high surface finish
quality. In this project, three roll materials for cold rolling of stainless
steel strip was examined, Vancron 40, Narva 12B (a high-carbon,
high-chromium tool steel alloyed with tungsten) and Supra 3 (a
Chromium-molybdenum tungsten-vanadium alloyed high speed
steel). The purpose of this project was to study the depth profiles of
the ironed stainless steel strips, emergence of galling and to study the
lubrication performance used by steel industries. Laboratory
experiments were conducted to examine scratch of the strip, galling
and surface roughness of the roll materials under severe tribological
conditions. The critical sliding length for onset of galling was
estimated for stainless steel with four different lubricants. Laboratory
experiments result of performance evaluation of resistance capability
of rolls toward adhesive wear under severe conditions for low and
high reductions. Vancron 40 in combination with cold rolling
lubricant gave good surface quality, prevents galling of
metal surfaces and good bearing capacity.

• Mohammed Tahir
• Jonas Lagergren

• Adhesive wear
• Cold rolling
• Lubricant
• Stainless steel
• Surface finish
• Vancron 40.

[1] M. Tahir, N.G. Jonsson, J. Lagergren, L. Wikström, H. Hedenlund,
“Evaluation of tool material Vancron 40 with regard to wear, surface
quality and galling” in Proc. JSI 2012 - 30th International Steel Industry
Conference, Paris, 2012.
[2] S. Hatami, A. Nafari, L. Nyborg, U. Jelvestam, “Galling related surface
properties of powder metallurgical tool steels alloyed with and without
nitrogen” Wear vol. 269. 3-4, Jun. 2010, pp.229-240.
[3] O.N. Cora, M. Koc “Experimental investigations on wear resistance
characteristics of alternative die materials for stamping of advanced
high-strength steels (AHSS)” International Journal of Machine Tools
and Manufacture vol. 49.12-13, Oct. 2009, pp. 897-905.
[4] M. Nilsson, M. Olsson, “Microstructural, mechanical and tribological
characterisation of roll materials for the finishing stands of the hot strip
mill for steel rolling”, Wear vol. 307.1-2, Sep 2013, pp. 209-217.
[5] A.S. Galakhar, J. D. Gates, JT. William, A. Paul; “Adhesive tool wear in
the cold roll forming process”, Wear vol. 271.11-12, Sep 2011, pp.
2728-2745.
[6] D. Bacci, G. Ius, “Wear Behavior of AISI D3 and AISI M3:2 Tool
Steels in a Mass Production Shearing Operation”, Wear vol. 91.2, Nov.
1983, pp.209-217.
[7] J. L. Andreasen, N. Bay, “A strip reduction test for measurement of
lubricity in ironing”, in Proc. 19th Biennial IDDRG Congress, Advanced
Sheet Metal Forming; Eger, 1996.
[8] J, L. Andreasen, N. Bay, M. Andersen, E. Christensen, N. Bjerrum,
“Screening the performance of lubricants for the ironing of stainless
steel with a strip reduction test” Wear vol. 207.1-2, (June 1997, pp. 1-5).