IS 1786
| Chemical Composition | Mechanical Properties | ||||||||
| Specification No. | Grade | C | S | P | S & P | 0.2% Present Proof Stress/Y.S.N. /mm2 Min | Tensile Strength Kgf/mm2 Min. | Elongation Min. | |
| IS/1786/85 | 415 | 0.30 | 0.060 | 0.060 | 0.110 | 415 | 10% more than actual y.s. but not less than 485.0 N/mm2 | 14.5 | |
| 500 | 0.30 | 0.055 | 0.055 | 0.105 | 500 | 8% more than actual y.s. but not less than 545.0 N/mm2 | 12.0 | ||
| 550 | 0.30 | 0.055 | 0.050 | 0.100 | 550 | 6% more than actual y.s. but not less than 585.0 N/mm2 | 8.0 | ||
Bend Test ::The bend test shall be performed in accordance with the requirements of IS :1599-1974* and the mendrel diameter shall be as specified in Table.The specimen shall be considered to have passed the test if there is no transverse crack in the bent portion.
* method for bent test for steel products other than sheet,strip wire and tube.
Rebend test : The test piece shall be bent to an included angle of 135° using a mandrel of appropriate diameter.The bent piece shall be aged by keeping in boiling water (100°C) for 30 minutes and then allowed to cool.The piece shall then be bent back to have an included angle of 157 1/2°C.The specimen shall be considered to have passed the test if there is no fracture in the bent portion.
The diameter of the mandrel shall be as given below :
* method for bent test for steel products other than sheet,strip wire and tube.
Rebend test : The test piece shall be bent to an included angle of 135° using a mandrel of appropriate diameter.The bent piece shall be aged by keeping in boiling water (100°C) for 30 minutes and then allowed to cool.The piece shall then be bent back to have an included angle of 157 1/2°C.The specimen shall be considered to have passed the test if there is no fracture in the bent portion.
The diameter of the mandrel shall be as given below :
| Nominal Size of Specimen | Dia of Mandrel for Fe 415 and Fe 500 | Dia of Mandrel for Fe 550 |
| Up to and including 10 mm | 5φ | 7φ |
| Over 10 mm | 7φ | 8φ |
where φ is the nominal size in mm of test piece.
TABLE:MANDREL DIAMETER FOR BEND TEST
| Nominal Size mm | Mandrel Diameter for Different Grades | |||
| Fe 415 | Fe 500 | Fe 550 | ||
| (1) | (2) | (3) | (4) | |
| Up to and including 22 | 3φ | 4φ | 5φ | |
| Over 22 | 4φ | 5φ | 6φ | |