Rebars: Rejection Stalls Ship Plate Conversion

Shipbreaking
ShipbreakingImage Source: SteelGuru

Synopsis:

India’s Steel Ministry panel disapproves the use of ship-breaking plates for TMT bars due to inconsistent samples, urging rigorous chemical testing and grade certification. The rejection hinges on variations in diameter and structural concerns, pushing for comprehensive evaluations on durability and corrosion resistance.

Article:

In a significant setback, India’s Steel Ministry committee dismissed the proposition to utilize ship-breaking steel plates for manufacturing TMT bars, citing issues with the samples' consistency and structural reliability. The rejection, highlighted in recommendations by the committee, emphasized the necessity for stringent chemical testing and the certification of grades.

The committee's thorough examination of samples retrieved from major shipyards revealed notable variations in diameter and discrepancies among the collected samples. The concerns raised center on ensuring the structural integrity of the proposed TMT bars, compelling the committee to call for comprehensive assessments encompassing durability studies and corrosion resistance checks.

The recommendations, scrutinized by businessline, outlined the committee's inability to formulate a Standard Operating Procedure (SoP) for using ship plates without thorough chemical composition tests. The committee's stance suggests that ship-breakers should vend plates alongside grade certificates and detailed chemistry reports.

Comprising officials from various esteemed organizations and industry bodies, including MECON, NISST, Ministry of Ports, Shipping & Waterways, and the Bureau of Indian Standards, the committee's conclusions derive from a collective evaluation and analysis.

The committee's on-site investigations, particularly at Gujarat’s Alang – the largest ship-breaking yard in Asia, revealed crucial observations. Samples gathered were deemed inadequate representations of ship hulls due to differences in stress encountered by various parts underwater, mid-ship, or above-water levels.

Samples from different shipyards were rolled into TMT bars of varying thicknesses (8 mm, 10 mm, and 12 mm) for laboratory tests, revealing disparities in samples of each diameter. The committee stressed the necessity for a robust dataset to ascertain the usability of these steel rebars for structural purposes.

Moreover, the committee emphasized the need for comprehensive studies on the behavior of beams, columns, and joints utilizing these rebars, including extensive durability studies with concrete. Corrosion resistance tests were also deemed vital, particularly for potential applications in coastal areas.

Conclusion:

The rejection of using ship-breaking plates for TMT bars signifies a notable setback, driven by concerns over inconsistent samples and structural reliability. The committee's recommendations underscore the imperative need for comprehensive evaluations, encompassing durability, behavior under stress, and corrosion resistance, highlighting the criticality of ensuring structural integrity in steel production.

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