On the formability of sheet steels

Paul, Surajit Kumar; Mishra, Shubham

doi:10.1007/bf02744631

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…The required microstructure is achieved by controlling the contents of micro-alloying elements like Cr, Cu, Ni, Mo, Nb, V and B. The impurity levels are strictly controlled to improve ductility, for example sulphur content has been lowered because it has been found to be very detrimental to bendability [6,7,8]. Advantages of the ultra-high-strength level (>900MPa) can be fully utilized only if fabricated properties are on a sufficient level.…”

Section: Introductionmentioning

confidence: 99%

Bendability and Microstructure of Direct Quenched Optim<sup>®</sup> 960QC

Kesti¹,

Kaijalainen

Väisänen

et al. 2014

MSF

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Use of ultra-high-strength steels (UHSS) in weight critical constructions is an effective way to save energy and minimize carbon footprint in the end use. On the other hand, the demands for reducing manufacturing costs and energy consumption of the steelmaker are increasing. This has led to development of energy efficient direct quenching (DQ) steelmaking process as an alternative to the conventional quenched and tempered or thermomechanical rolling and accelerate cooled processes. Ruukki has employed thermomechanical rolling and direct quenching process (TM + DQ) for a novel type of ultra-high-strength strip and plate steels since 2001. Advantages of the ultra-high-strength level (>900MPa) can be fully utilized only if fabricated properties are on a sufficient level. Bending is one of the most important workshop processes and a good bendability is essential for a structural steel. Hence, the metallurgy and bendability of Ruukki ́s TM + DQ strip steel Optim® 960QC have been investigated closely. It was found that by optimizing process parameters and chemical composition, a good combination of strength and ductility can be achieved by a modification of martensitic-bainitic microstructure. Despite of smaller total elongation, the bendability of Optim® 960QC is at least on the same level as on conventionally manufactured 960MPa steels. However, it is important to pay special attention to bending process (tool parameters, springback, bending force, material handling) when bending UHSS. It was also found that the bendability of Optim® 960QC can be significantly enhanced by local laser heat treatments or roll forming.

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Section: Introductionmentioning

confidence: 99%