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TMT TMPCORE BARSStrength of the bars are carefully controlled by optimizing the water pressure for their pearlitic core and tough surface of tempered martensite, thereby providing an optimum strength, ductility and toughness. TMT bars are widely used in general purpose concrete reinforcement structures, bridges and flyovers, dams, thermal and hydel power plants, industrial structures, high-rise buildings, underground platforms in metro railway and rapid transport system. TMT Bars are thermo-mechanically-treated through leading world temp core based technology for high yield strength. The process involves rapid quenching of the hot bars through a series of water jets after they roll out of the last mill stand. The bars are cooled, allowing the core and surface temperatures to equalize. The bar core cools down slowly to turn into a ferrlite-pearlite aggregate. Kamdhenu Ispat Ltd., Bhiwadi unit has been authorized by CRM, Belgium to manufacture Tempcore TMT under licence agreement. |
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Features of TMT Bars
Frequently asked question about Kamdhenu T.M.T
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| Q: What is TMT Saria? |
| A: It is a special type-of saria manufactured using a latest technology. In developed countries only TMT Saria is used for construction activities. |
| Q: How TMT Saria is manufactured? |
| A: This high quality saria is manufactured using most advanced technology of the 21st century called 'Thermo Mechanical Treatment'. |
| Q: Why should you use TMT Saria? |
| A: Because it is very strong and economical. |
| Q: How it is economical? |
| A: Because of its 20 % more strength. |
| Q: Is TMT Saria used for high rising building, bridges and dams only? |
| A: Not at all. It is used for all types of construction works ranging from buildings to dams. |
| Q: So what are the other specialties of this saria? |
| A: 1. It is earth quake resistant because of its high tensile strength and flexibility. |
| 2. It is less affected by rust. |
| 3. It has 4 % less weight per meter than normal that makes it economical. |
| 4. It has more strength to sustain fire. |
| 5. It bonds strongly with cement than other reinforcement bars. |
| 6. It does not peel off the skin while working with it. |
| Q: How can distinguish genuine Kamdhenu TMT Saria? |
| A: Kamdhenu stamp on every meter of saria and red Kamdhenu strip on every bundle proves the genuineness of Kamdhenu TMT Saria. So watch out for these two things while purchasing Kamdhenu TMT Saria. |
| Q: Is there duplicate TMT Saria available in the market? |
| A: Yes, Duplicate TMT Saria are very much available in the market from local manufacturers who apply water on cheap saria during production to make them look alike TMT Saria. Some other brands are sold saying it is product of Kamdhenu. |
| Q: How can duplicate TMT Saria be detected? |
| A: Just avoid the local products. Go for reputed brands to avoid any cheating and fake products. |
| Q: How many grades are there in TMT Saria? |
| A: Fe - 415, Fe- 500 and Fe- 550 are three grades in TMT Saria. Fe- 550 is the strongest among the three. Kamdhenu has the credit of manufacturing Fe - 550 grade Saria first time in India. These three grades of Kamdhenu Saria come at 8 mm to 25 mm range. |
| PROPERTIES/COMPOSITION | INDIA (IS 1786) | KAMDHENU TMT | AMERICAN (ASTM A 615) | EURO (DIN 488) |
| MECHANICAL PROPERTIES | Grade Fe - 415 |
Grade Fe - 415 -
K |
Grade 40
(300) |
BSt 420 -
S |
| Proof Stress (Min.) | 415 N/mm2 |
450 N/mm2 |
300 Mpa |
420 MPA |
| Tensile Strength (Min.) | 485 N/mm2 |
530 N/mm2 |
500 Mpa |
500 MPA |
| Elongation (Min.) | 14.50% |
20% |
12% |
10% |
| Bend Test (Min.) | Upto 22 mm-3D |
Upto 22 mm-2D |
10 to 16 mm-3.5D upto 20 mm-5-D |
6 To 12 MM-5d 14 To 16 MM-6d 20 To 28 MM-6d |
| CHEMICAL COMPOSITION (%) | ||||
| Carbon | 0.30 Max. | 0.30 Max. |
0.24-0.33 % |
0.22 Max. |
| Sulphur | 0.06 Max. |
0.06 Max. |
0.05 Max. |
0.05 Max. |
| Phosphorus | 0.06 Max. |
0.06 Max. |
0.06 Max. |
0.05 Max. |
| S+P | 0.11 Max. |
0.11 Max. |
0.110 Max. |
0.100 Max. |
| MECHANICAL PROPERTIES | Grade Fe - 500 |
Grade Fe - 500-K |
Grade 60
(420) |
Bst 500-s |
| Proof Stress (Min.) | 500 N/mm2 |
530 N/mm2 |
420 Mpa |
500 Mpa |
| Tensile Strength (Min.) | 545 N/mm2 |
600 N/mm2 |
620 Mpa |
550 Mpa |
| Elonngation(Min.) | 12% |
16% |
9% |
10% |
| Bend Test (Min.) | Upto 22 mm-4D |
Upto 22 mm-3D |
10 to 16 mm-3.5D 20 mm to 25mm-5D 28 mm to 32mm-7D |
6 To 12 MM-5d 14 To 16 MM-6d 20 To 28 MM-6d |
| CHEMICAL COMPOSITION (%) | ||||
| Carbon | 0.30 Max. | 0.17-0.24% |
0.30-0.40% |
.22 Max. |
| Sulphur | 0.06 Max. |
0.05 Max. |
0.05 Max. |
0.05 Max |
| Phosphorus | 0.06 Max. |
0.05 Max. |
0.05 Max. |
0.05 Max |
| S+P | 0.105 Max. |
0.095 Max. |
0.100 Max. |
0.100 Min. |
| Mn. | 0.5 Min. |
0.60 Min. |
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| Si. | 0.4 Max. |
1.30-1.60 |
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| MECHANICAL PROPERTIES | Grade Fe- 550 |
Grade Fe-
550-k |
Grade 75
(520) |
Bst 500-M |
| Proof Stress (Min.) | 550 N/mm2 |
575 N/mm2 |
520 Mpa |
500 Mpa |
| Tensile Strength (Min.) | 585 N/mm2 |
650 N/mm2 |
690 Mpa |
550 Mpa |
| Elonngation (Min.) | 8% |
14% |
7% |
8% |
| Bend Test | Upto 22 mm-5D |
Upto 22 mm-4D |
6 to 25 mm-5D above 20 mm-7D |
6 D |
| CHEMICAL COMPOSITION (%) | ||||
| Carbon | 0.30 Max. | 0.17-0.24 |
0.30-0.40 |
0.022 Min. |
| Sulphur | 0.055 Max. |
0.045 Max. |
0.05 Max. |
0.050 Min. |
| Phosphorus | 0.050 Max. |
0.045 Max. |
0.05 Max. |
0.050 Min. |
| S+P | 0.100 Max. |
0.090 Max. |
0.100Max. |
0.100 Max. |
| Mn. | 0.5 Min. |
1.30-1.60 |
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| Si. | 0.4 Max. |
1.30-1.60 |
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Kamdhenu TMT
TMT (Thermo Mechanicallly Treated Bars) are the most popular reinforcement bars in the world. Kamdhenu Ispat Group is the largest reinforcement bars manufacturing group in India. The group is manufucturing international quality TMT Fe - 415, 500, 550 bars with best features for construction industry. High speed Latest Technology TMT Grade Fe - 415, 500, 550 has the best strength with better mildness, better corrosion resistance, better bond strength with cement Resistance to fire hazard excellent ductility, higher fatigue strength, easy work ability at site, better results than BIS standards, savings of 14-19% steel, reduction in construction costs.
Product Specification
| Trade Mark | KAMDHENU TMT |
| Grades | Kamdhenu TMT Grade Fe- 415, Fe - 500, Fe - 550* |
| Diameter | 8,10,12,16,20,25 MM (28 and 32 min. On bulk demand) |
| Standard Length | 5.5 mtrs. To 13 mtrs. |
Certification
Against IS : 1786/85 Grade Fe- 415, Fe -500, Fe- 550 for chemical composition, mechanical properties & dimensional Tolerances, Material can be supplied also as per international standard like DIN 488 - Bst 500. BS 444 Gr. 450 ASTM 615 etc. Or any special requirement of customers.
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