HISTORY For year’s, Bamboo has been used by man for construction activities, later it has been replaced by CTD (Cold Twisted Deformed steel rods) or TOR steel rods. The manufacturers adopted the Cold Twisting Process in which the naturally cooled rods were twisted by means of motors. Thus the molecular structure of the core steel is weakened. Thus it should not be used for construction activities. Now, the TMT (Thermo Mechanically Treated) steel bars have emerged. Description TMT Bars, Thermo mechanically treated bars are high strength deformed steel bars used in reinforced cement concrete (RCC) work manufactured with the help of advancement of technology. TMT bars are latest production in MS steel bars and have superior properties such as strength, ductility, welding ability, bending ability and highest quality standards at international level. Technical Specification Chemical Composition Constituent Percent, Maximum Fe 415 Fe 415D Fe 500 Fe 500D Fe 550 Fe 550D Fe 600 Carbon 0.30 0.25 0.30 0.25 0.30 0.25 0.30 Sulphur 0.060 0.045 0.055 0.040 0.055 0.040 0.040 Phosphorus 0.060 0.045 0.055 0.040 0.055 0.040 0.040 Sulphur & Phosphorus 0.110 0.085 0.105 0.075 0.100 0.075 Nominal Cross - Sectional Area And Mass S.No. Normal Size (mm) Cross Sectional Area (mm) Mass per meter (kg) Permissible Tolerance for individual Sample 1 8 50.3 0.395 -7% 2 10 78.6 0.617-7% 3 12 113.1 0.888 -5% 4 16 201.2 1.580 -5% 5 20 314.3 2.470 -3% 6 25 491.1 3.850 -3% 7 28 615.8 4.830 -3% 8 32 804.6 6.310 -3%
Diameter(mm) F6, f8, f10, f12, f13, f14, f16, f18, f20, f22, f25, f28, f32, f36, f40, f50 Length(m) Unfolded / straight bundles weighing up to 2 metric tons Lengths is 6 meters up to 15 meters or according to customers' requirement U shaped folded bundles weighing up to 2 metric tons and length is 12 meters Rounded coils ~up to 2 metric ton coils for bending / cutting machine use. Standard Gb(hrb335/hrb400/hrb500); Bs4449 -1997 grade 250b, 460b; bs4449-2005 grade 500b; Astm a615 grade 40, grade60, grade75; astm a706;sae1008b Din488-1 420s/500s, bst500s/500m Jis g3112 sd35, sd40, sd50, sd390 Nfa 35016 fe e 400, fe e 500 Ca 50/60, sd400 Gost a3 r a500c Tmt fe415, 415d, 500, 500d, 550, 550d Surface finished Screw-thread epoxy coating galvanized coating Production facility Imports of production equipment from italy Production capacity 100, 000t/month Payment term T/t or 100% l/c at sight Delivery time: Generally within 20 days after receiving the deposit or l/c at sight. Package : 1. in bundles.One bundle is about 2-3tons 2.Waterproof package 3.According to customers' requirements
