UK Certification Authority for Reinforcing Steels
Copyright © 1998-
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 |
BS4449: 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 |
| Min | 492.0 | 553.0 | 12.5 | 2.4 | 1.02 |
| Max | 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 B500A | 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 |
| Min | 492.0 | 553.0 | 12.5 | 2.4 | 1.02 |
| Max | 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 |
| Grade B500B | Yield(Re) MPa | UTS(Rm) MPa | A5 % | Agt % | Rm/Re |
| Samples | 3458 | 3458 | 3458 | 3458 | 3458 |
| Mean | 552.09 | 663.49 | 23.66 | 11.04 | 1.20 |
| Min | 494.4 | 569.6 | 14.0 | 4.8 | 1.07 |
| Max | 635.2 | 785.7 | 82.1 | 19.8 | 1.45 |
| Standard Deviation | 22.13 | 32.12 | 3.49 | 2.03 | 0.05 |
| 95% Characteristic | 515.68 | 610.65 | 17.91 | 7.70 | 1.11 |
| Grade B500C | Yield(Re) MPa | UTS(Rm) MPa | A5 % | Agt % | Rm/Re |
| Samples | 300 | 300 | 300 | 300 | 300 |
| Mean | 542.03 | 661.76 | 24.98 | 12.21 | 1.22 |
| Min | 496.3 | 610.6 | 18.8 | 7.8 | 1.15 |
| Max | 624.2 | 722.3 | 36.3 | 17.8 | 1.34 |
| Standard Deviation | 20.38 | 25.40 | 3.36 | 2.09 | 0.04 |
| 95% Characteristic | 508.39 | 619.85 | 19.43 | 8.76 | 1.16 |
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UK Certification Authority for Reinforcing Steels |