Depending on physical properties and chemical compositions there’re primary 4 grades of TMT bars available in India – Fe 415 grade, Fe 500 grade, Fe 550 grade, and Fe 600 grade. The sizes of TMT bars available in a range of 8 mm diameter to 36 mm diameter.
Every grade is grouped as per its unique yield force and functioning. Different grades of TMT bars offer different strengths, features, and dimensions.
A deep understanding of different types or grades of TMT bars is compulsory for choosing the right TMR bars for your infrastructure.
Quality analysis to choose right Grade TMT Bars
Various types of infrastructure need certain grades of TMT bars to ensure strength, standardization, and durability. The grade of TMT bars used in residential projects will not be the same in industrial and commercial projects.
Bureau of Indian Standards (BIS) controls the quality and standardization of Indian manufacturing industries. BIS has set a pro forma named IS 1786 for grading Indian TMT steel bars. Indian steel manufacturing companies comply with IS 1786 standards with other additional features like corrosion resistance, ductility, etc.
Tufcon complies with all the IS 1786 norms and produces the best quality TMT steel bars along with all types of grades and sizes.
TMT Bar Grades and Their Features
According to IS 1786 (Bureau of Indian Standards), here are short details of the 4 grades of TMT steel bars and their chemical compositions and mechanical features.
Fe 415 grade TMT bars
Fe 415 grade is designed for small-scale infrastructures. It’s mostly used in residential and small commercial projects. Fe 415 is less expensive and affordable for median citizens.
Mechanical properties of Fe 415 grade TMT bars
- Minimum proof stress – 415N per square mm
- Minimum tensile strength – 485N per square mm
- Minimum elongation – 14.50 %
- Mandrel dia for bend test – up to 20 mm 3D and over 20 mm 4D
Chemical composition of Fe 415 grade TMT bars (%)
- Carbon – 0.30 maximum
- Sulphur – 0.06 maximum
- Phosphorus – 0.06 maximum
- S + P – 0.11 maximum
Fe 500 grade TMT bars
Fe 500 grade TMT bar is popular for constructions in seismic prone areas. This grade can be used for residential or commercial high-rise projects.
Mechanical properties of Fe 500 grade TMT bars
- Minimum proof stress – 500N per square mm
- Minimum tensile strength – 545N per square mm
- Minimum elongation – 12 %
- Mandrel dia of bend test – up to 20 mm 4D and over 20 mm 5D
Chemical composition of Fe 500 grade TMT bars (%)
- Carbon – 0.30 maximum
- Sulphur – 0.055 maximum
- Phosphorus – 0.055 maximum
- S + P – 0.105 maximum
Fe 550 grade TMT bars
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
Fe 600 grade TMT bars
Fe 600 grade TMT bars are exclusively designed for mega-scale projects like expressways, bridges, industrial plants, etc. Special properties of Fe 600 grade TMT bars include corrosion resistance, heavy load-bearing capacity, and so on.
Mechanical properties of Fe 600 grade TMT bars
- Minimum proof stress – 600N per square mm
- Minimum tensile strength – 660N per square mm
- Minimum elongation – 8 %
- Mandrel dia of bend test – up to 20 mm 6D and over 20 mm 7D
Chemical composition of Fe 600 grade TMT bars (%)
- Carbon – 0.30 maximum
- Sulphur – 0.040 maximum
- Phosphorus – 0.040 maximum
- S + P – 0.075 maximum
Sizes of TMT bars available in India
A variety of sizes of TMT bars available in India. The size range differs from 8 mm diameter to 36 mm diameter in the market. Indian TMT steel manufacturing companies produce TMT bars in the following diameters –
- 8 mm, 10 mm in diameter – mainly used for low load-bearing purposes like stairs, slabs.
- 12 mm, 16 mm, 20 mm, 25 mm in diameter – mainly used for medium load-bearing purposes like columns, beams.
- 32 mm, 36 mm in diameter – extensively used for high load-bearing purposes like bridges, high-rise constructions.
Final Words:
Choosing the right TMT bars is an essential matter for construction projects. At Tufcon, we maintain all the IS 1786 measures (Bureau of Indian Standards) in regard to quality manufacturing facilities. If you are keen to procure the best quality TMT bars for your construction projects, contact us.
