Optimization of Rolling Conditions in Nb Microalloyed Steel Processed by Thin Slab Casting and Direct Rolling Route: Processing Maps

2005 ◽  
pp. 245-252
Author(s):  
P. Uranga ◽  
A.I. Fernández ◽  
Beatriz López ◽  
J.M. Rodriguez-Ibabe
Keyword(s):  
Microalloyed Steel ◽  
Processing Maps ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting ◽  
Direct Rolling ◽  
Nb Microalloyed Steel ◽  
Rolling Route

Optimization of Rolling Conditions in Nb Microalloyed Steel Processed by Thin Slab Casting and Direct Rolling Route: Processing Maps

2005 ◽  
Vol 500-501 ◽  
pp. 245-252 ◽  
Author(s):  
P. Uranga ◽  
Ana Isabel Fernández-Calvo ◽  
Beatriz López ◽  
J.M. Rodriguez-Ibabe
Keyword(s):  
Microalloyed Steel ◽  
Coarse Grain ◽  
Processing Maps ◽  
Processing Conditions ◽  
Thin Slab Casting ◽  
Slab Casting ◽  
Direct Rolling ◽  
Nb Microalloyed Steel ◽  
Nb Microalloying ◽  
Rolling Route

The microstructural evolution during the hot rolling of coarse grain sized austenite has been modeled taking into consideration all the microstructural mechanisms (dynamic, static and metadynamic recrystallization, strain induced precipitation) that could take place during the industrial TSDR production of a Nb microalloyed steel. Based on the results obtained from the model, processing maps have been drawn for a 0.035%Nb microalloyed steel. Optimum processing conditions to exploit all the benefits of Nb microalloying have been defined considering a final gauge thickness range between 1.5 and 12.65 mm.

Potential of Hot Rolled Dualphase Steel from Compact Strip Production CSP® in Automotive Applications

2012 ◽  
Vol 706-709 ◽  
pp. 2278-2283
Author(s):  
Carl Peter Reip ◽  
Christian Klinkenberg ◽  
Long Chang Tong ◽  
Pavel Hora
Keyword(s):  
Mechanical Properties ◽  
Forming Limit ◽  
Thin Slab ◽  
Forming Simulation ◽  
Thin Slab Casting ◽  
Hot Strip ◽  
Slab Casting ◽  
Direct Rolling ◽  
Hot Rolled ◽  
Strip Production

Industrial thin slab casting and direct rolling processing started in 1989 with the world’s first CSP® plant at Crawfordsville (USA). Since this time CSP® and competing thin slab casting and direct rolling concepts have been developed to a standard process for hot strip production [1]. Typical features of the CSP® process are the homogeneous structural and mechanical properties all along the strip. Direct hot rolling of thin slabs may be followed by a well defined cooling pattern to produce hot strip from high strength multiphase steel, like dualphase (DP) grades, on the runout table. These steel grades are characterized by a favorable combination of strength and ductility based on hard martensitic particles embedded in a ductile ferritic matrix. This paper highlights the mechanical properties of hot rolled DP steel from CSP® production. To this purpose, multiple tests and modeling have been applied to determine e.g. r-values, forming limit curves and yield locus. In addition, forming simulation as well as laboratory and industrial deep drawing tests have been performed.

Processing of Niobium Microalloyed API Grade Steel on a Thin Slab Plant

2005 ◽  
Vol 500-501 ◽  
pp. 253-260 ◽  
Author(s):  
Christian Klinkenberg ◽  
K.-E. Hensger
Keyword(s):  
Work Hardening ◽  
Polymorphic Transformation ◽  
Thermomechanical Processing ◽  
High Strength ◽  
Low Carbon ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting ◽  
Direct Rolling ◽  
Grade Steel

The use of thin slab casting and direct rolling is well suited for the production of niobium microalloyed low-carbon high strength linepipe grades. The slabs have excellent surface quality. Thermomechanical processing by controlling hot work hardening and softening processes of austenite and its polymorphic transformation into ferrite results in a powerful microstructure refinement. This is a sound basis for setting high strength, combined with excellent ductility and toughness.

scholarly journals Vanadium Microalloyed Steel for Thin Slab Casting and Direct Rolling

2005 ◽  
Vol 500-501 ◽  
pp. 237-244 ◽  
Author(s):  
Yu Li ◽  
T.N. Baker
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Grain Structure ◽  
High Yield ◽  
Microalloyed Steels ◽  
Dispersion Strengthening ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting ◽  
Direct Rolling

Vanadium microalloyed steels with high yield strength (»600MPa), good toughness and ductility have been successfully produced in commercial thin slab casting plants employing direct rolling after casting. Because of the high solubility of VN and VC, most of the vanadium is likely to remain in solution during casting, equalisation and rolling. While some vanadium is precipitated in austenite as cuboids and pins the grain boundaries, a major fraction is available for dispersion strengthening of ferrite. Despite a coarse as-cast grain size, significant grain refinement can be achieved by repeated recrystallisation during hot rolling. Consequently, a fine and uniform ferrite grain structure is produced in the final strip. Increasing the V and N levels increases dispersion strengthening which occurs together with a finer ferrite grain size. The addition of titanium to a vanadium containing steel, decreases the yield strength due to the formation of V-Ti(N) particles in austenite during both casting and equalisation. These large particles reduced the amount of V and N available for subsequent precipitation of fine (~5nm) V rich dispersion strengthening particles in ferrite.

20 Years of Experience in Thin Slab Casting and Rolling State of the Art and Future Developments

2010 ◽  
Vol 638-642 ◽  
pp. 3610-3615 ◽  
Author(s):  
Christian Klinkenberg ◽  
C. Bilgen ◽  
T. Boecher ◽  
J. Schlüter
Keyword(s):  
High Carbon Steel ◽  
Rolled Strip ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Hot Strip ◽  
Slab Casting ◽  
Steel Grades ◽  
Direct Rolling ◽  
Cold Rolled ◽  
Multiphase Steel

Industrial thin slab casting and direct rolling processing started in 1989 with the world’s first CSP® plant at Crawfordsville (USA). Since this time CSP® and competing thin slab casting and direct rolling concepts have been developed to a standard process for hot strip production. Typical features of the CSP® process are the homogeneous structural and mechanical properties all along the strip. Direct hot rolling of thin slabs may be followed by a well defined cooling pattern to produce fine-grained HSLA steel or multiphase hot strip on the runout table. The product range covers low carbon as well as medium and high carbon steel grades comprising IF-, HSLA-, API-, electrical- and multiphase steel grades. CSP® processed thin hot strip is used for non-exposed parts and may substitute cold rolled strip. Hot strip from thin slab can be easily further processed to cold rolled and/or surface treated strip. Today process and material developments e.g. go for energy saving, rise in productivity, advanced surface requirements, HSLA and multiphase steel grades combining higher strength and ductility as well as multiphase steel grades for hot dip galvanizing.

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