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Grade 500E reinforcing steel

Starting in 2003, when concerns were raised about the performance of Grade 500E reinforcing steel, we led investigations and informed industry about the characteristics of the material and good practice in its use.

This included research, commissioned by us, into the effect of bend diameter and temperature on the ductility of Grade 500E reinforcement.  It confirmed the adequacy of bend diameters specified in NZS 3101 (2006), at least for temperatures above -10°C and applies to both micro-alloy (MA) and quenched and tempered (QT) types.

This information was confirmed as current in February 2016. It originally appeared in Codewords newsletters prior to January 2014.

  • Published on 1 December 2008
  • Updated on 8 September 2017
  • Of interest to Designers, Engineers, Architects, Structural engineers,
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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: