Technical Specification
Fe 550 — Grade Specifications
Our TMT Bar Quality Standards as per IS-1786
| Constituent | Percent, Maximum | |||||
|---|---|---|---|---|---|---|
| Fe 415 | Fe 415D | Fe 500 | Fe 500D | Fe 550 | Fe 550D | |
| Carbon | 0.30 | 0.25 | 0.30 | 0.25 | 0.30 | 0.25 |
| Sulphur | 0.060 | 0.045 | 0.055 | 0.040 | 0.055 | 0.040 |
| Phosphorus | 0.060 | 0.045 | 0.055 | 0.040 | 0.055 | 0.040 |
| Sulphur & Phosphorus | 0.110 | 0.085 | 0.105 | 0.075 | 0.100 | 0.075 |
| S.No. | Normal Size (mm) | Cross Sectional Area (mm²) | 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% |
| Properties | Fe 415 | Fe 415D | Fe 500 | Fe 500D | Fe 550 | Fe 550D |
|---|---|---|---|---|---|---|
| 0.2% proof stress / Yield stress, min. N/mm² | 415 | 415 | 500 | 500 | 550 | 550 |
| Elongation, Min. on Gauge Length 5.65√A* | 14.5% | 18.0% | 12.0% | 16.0% | 10.0% | 14.5% |
| Total Elongation at max. Force, Min. on gauge Length 5.65√A* | - | 5% | - | 5% | - | 5% |
| Tensile strength, Min. | 10% more than actual 0.2% proof stress, min. 485 N/mm² |
12% more than actual 0.2% proof stress, min. 500 N/mm² |
8% more than actual 0.2% proof stress, min. 545 N/mm² |
10% more than actual 0.2% proof stress, min. 565 N/mm² |
6% more than actual 0.2% proof stress, min. 585 N/mm² |
8% more than actual 0.2% proof stress, min. 600 N/mm² |
The standard tests that are carried out during the production of Sidhbali TMT Bars are:
TEST FOR TENSILE STRENGTH
The tensile strength , percentage elongation, percentage total elongation at maximum force and 0.2 percent proof stress of bars shall be determined in accordance with requirements of IS: 1608 read in conjunction with IS: 2062.
TEST FOR BENDING ABILITY
The test sample when cold shall be doubled over the specified mandrel by continuous pressure until the sides are parallel. The test sample shall be considered to have passed the test if there is no rupture or cracks visible to a person of normal or corrected vision on the re-bend portion.
TEST FOR REBENDING ABILITY
The test sample shall be bend to an included angle of 135o using a mandrel of appropriate diameter. The bent piece shall be aged by keeping in boiling water 100oC for 30 min. and then allowed to coll. The piece shall then be bend back to have an included angle of 157.5oc. The test sample shall be considered to have passed the test if there is no rupture or cracks visible to a person of normal or corrected vision on the re-bend portion.