Statistical analysis of BS 4449 Reinforcing Steels
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Certification for the Construction Industry
Statistical analysis of BS 4449 Reinforcement
The following summary of test results obtained from BS 4449 material was produced from data obtained from the test results from routine CARES surveillance audits and subjected to testing at independent laboratories.
BS 4449: 1997 Grade 460
The data were collected during the period January 1994 to September 1995.
Summary of results from all producers of BS 4449 Grade 460
| All Grades | Yield stress at 0.43 % total strain Nmm-2 | UTS Nmm-2 | A5% | Agt% | Rm/Re |
| Mean | 530 | 618 | 23.8 | 11.1 | 1.17 |
| Standard Deviation | 32.1 | 34.4 | 3.5 | 3.0 | 0.048 |
| Minimum | 474 | 531 | 13 | 4.0 | 1.05 |
| Maximum | 623 | 711 | 34 | 21.3 | 1.34 |
| Samples | 1080 | 1080 | 1080 | 968 | 1080 |
| 95% characteristic | 477 |
BS 4449: 2005 Grade B500
The data were collected during the period March 2005 to September 2006.
Summary of results from all producers of BS 4449 Grade B500
All Grades | Yield(Re) MPa | UTS(Rm) MPa | A5% | Agt% | Rm/Re |
| Samples | 4168 | 4168 | 4168 | 4168 | 4168 |
| Mean | 553.25 | 658.46 | 23.10 | 10.57 | 1.19 |
| Minimum | 492.0 | 553.0 | 12.5 | 2.4 | 1.02 |
| Maximum | 638.0 | 785.7 | 82.1 | 19.8 | 1.45 |
| Standard Deviation | 23.56 | 34.64 | 3.93 | 2.64 | 0.06 |
| 95% characteristic | 514.49 | 601.47 | 16.64 | 6.23 | 1.09 |
| Grade 500A | Yield(Re) MPa |
UTS(Rm) MPa | A5% | Agt% | Rm/Re |
| Samples | 410 | 410 | 410 | 410 | 410 |
| Mean | 569.97 | 611.98 | 17.07 | 5.42 | 1.07 |
| Minimum | 492.0 | 553.0 | 12.5 | 2.4 | 1.02 |
| Maximum | 638.0 | 673.0 | 25.8 | 12.8 | 1.19 |
| Standard Deviation | 28.97 | 23.94 | 2.00 | 1.51 | 0.03 |
| 95% characteristic | 522.22 | 572.52 | 13.78 | 2.92 | 1.03 |
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