550 grade TMT bars Composition and Mechanical Properties



Fe 500 grade TMT bar is suitable for large-scale projects like bridges, industrial infrastructures. This grade is very popular in coastal and marine areas. Fe 550 can be used for underground projects for its high load-tolerating capacity.

Mechanical properties of Fe 550 grade TMT bars

  • Minimum proof stress – 550N per square mm
  • Minimum tensile strength – 585N per square mm
  • Minimum elongation – 8 %
  • Mandrel dia of bend test – up to 20 mm 5D and over 20 mm 6D

Chemical composition of Fe 550 grade TMT bars (%)

  • Carbon – 0.30 maximum
  • Sulphur – 0.055 maximum
  • Phosphorus – 0.050 maximum
  • S + P – 0.100 maximum 

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