8.0
Tolerance on Bar Manufacture Tolerances on Bar Manufacture (AS/NZS 4671) (a) Chemical composition A cast analysis and a product analysis is required. See AS/NZS 4671 Table 1.
Table 4: Carbon content of reinforcing steel
An upper limit is given for the cast analysis. This is made while the steel is in a liquid form and therefore while the composition of the steel can be adjusted. Due to changes during casting of billets and subsequent rolling into the finished product, slightly higher limits are allowed for the product analysis. (b) Drawing/Rolling tolerances Mass/unit length
± 4.5%
(c) On bar length (bars AS/NZS 4671) L ≤ 7 m + 0, - 40 mm L > 7 but < 12 m + 40, - 40 mm L ≥ 12 m + 60, - 40 mm (d) Straightness on length L, in units of L Bar sizes ≤16 mm L/50 Bar sizes ≥ 20 mm L/100 (e) Deformations There are no tolerances given for deformations. Values are maximum or minimum. See Clause 7.4 and Appendix C3 of AS/NZS 4671. (f) Manufacturer and mill identification The distance between the identifying marks (deformed bars), equals the circumference of the rolls which have the deformations cut into them. Identifiers are usually on one side only. They identify the steel maker and the rolling mill. (g) Mesh tolerance between adjacent wires Distance ±0.075 x pitch (h) Mesh sheet size Dimension Dimension
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≤ 6000 mm ±40 mm L > 6000 mm ±0.007 L
ARC - Reinforcement Handbook