A Review on Twin Strand Slab Casting and Impact of Speed Variation on Quality of Steel

Kumar Mangalam

doi:10.36948/ijfmr.2026.v08i04.83789

A Review on Twin Strand Slab Casting and Impact of Speed Variation on Quality of Steel

Author(s)	Mr. Kumar Mangalam
Country	India
Abstract	Twin strand slab casting, in which a single tundish feeds two parallel strands, is a preferred configuration for high tonnage production of flat steel because it approximately doubles caster output at modest additional cost. Within this configuration the withdrawal speed is the dominant operating variable, since it fixes the time available for heat extraction and thereby governs shell growth, the depth of the liquid core, the metallurgical length and the population of defects. This review condenses recent modelling studies, industrial trials and analytical treatments on how variation of casting speed affects slab quality, with attention to the twin strand layout. Faster withdrawal thins the mould exit shell in inverse proportion to the square root of speed, lengthens the metallurgical length in direct proportion to speed and raises the ferrostatic load, intensifying centreline segregation, porosity and bulging, while abrupt speed transients cause localised shell thinning that traps solute rich liquid. Speeds that are too low impair mould flux melting and promote slag entrapment, so an optimum speed window exists for every caster. Reported data indicate that the centreline segregation index rises from about 1.05 to more than 1.40 as slab speed increases from about 1.2 to 2.0 metre per minute, that mould exit shell thickness can fall below 10 millimetre above about 1.4 metre per minute, and that longitudinal cracking can rise by up to 40 percent above about 1.6 metre per minute unless countermeasures are applied. Dynamic soft reduction, optimised mould taper, high frequency non sinusoidal oscillation, electromagnetic braking and stirring, engineered mould fluxes and data driven control are shown to widen the usable speed window. Twin strand specific issues are highlighted, notably symmetric flow distribution between strands from a shared tundish, the sensitivity of that symmetry to thermal disturbance, and the need to match strand speeds within the safe window of each strand.
Keywords	Twin Strand Slab Casting, Casting Speed, Shell Thickness, Centreline Segregation, Dynamic Soft Reduction, Mould Taper, Mould Oscillation, Bulging, Slab Quality
Field	Engineering
Published In	Volume 8, Issue 4, July-August 2026
Published On	2026-07-18
DOI	https://doi.org/10.36948/ijfmr.2026.v08i04.83789

View / Download PDF File

About IJFMR Fees & Payment Current Issue Publication Archive	Submit Research Paper Track Submission Status Publication Guidelines Publication Ethics Peer Review & Plagiarism	Join as a Reviewer Editors & Reviewers Reviewer Referral Program Get Reviewer Membership Certi.	Website/Journal Policies Usage Policy Content Policies Privacy Policy

Contact Us		+91-9687-828-838	editor@ijfmr.com

International Journal For Multidisciplinary Research

A Widely Indexed Open Access Peer Reviewed Multidisciplinary Bi-monthly Scholarly International Journal

A Review on Twin Strand Slab Casting and Impact of Speed Variation on Quality of Steel

Share this