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AS/NZS 4671 : 2001 Australia / New Zealand Reabr, Steel for the reinforcement of concrete - standard dimensions, weight and properties

AS/NZS 4671 Australia / New Zealand Reabr, Steel for the reinforcement of concrete - standard dimensions, weight and properties

AS/NZS 4671 Australia / New Zealand, properties, dimensions, mechanical characteristic chemical composition, weight, tolerance. This standard provides the specifications of the material requirements for steel bars, wire and mesh intended for use in the reinforced concrete structures. AS/NZS 4671, published on 2 April 2001, is the current joint Standard, covering reinforcing steel in the form of bar, wire and machine welded mesh. It is one of the many Standards that the Australian and New Zealand governments agreed to combine under the CER agreement to free up trade between the two countries.

Table - standard dimensions and characteristic

Nominal dimensions			Nominal weight (mass) per unit of length, kg/m	Tolerance, %
Diameter, mm	Nominal Cross-section area, mm2	Nominal Cross-section area, mm2
10	78	78,5	0,617	± 8%
12	110	113	0,888	± 8%
16	200	201	1,58	± 5%
20	310	314	2,47	± 5%
24	450	452	3,55	± 5%
28	620	616	4,83	± 5%
32	800	804	6,31	± 5%
36	1020	1020	7,99	± 4%
40	1260	1260	9,86	± 4%

AS/NZS 4671:2001 “Steel Reinforcing Material” , has included three different ductility classes of Grade 500 reinforcement; Class L (low ductility), Class N (normal ductility), and Class E (high ductility for Earthquake prone regions). Class L steel includes cold worked wires and welded wire mesh. Class N and Class E steels include hot rolled deformed bars.

Table - Mechanical properties, characteristic

Strength grade	Yield strength, Re, N/mm2	Tensile strength, Rm, N/mm2	Ratio, Rm / Re	Elongation As,%	Elongation Agt,%
D500N	500		≥ 1,08		≥5
R250N	250				≥5
D250N	250				≥5
D500L	500		≥ 1,03		≥1,5
R500L	500				≥1,5
GR 500 E	500		>1,15 - <1,40		≥10

The reinforcing steel classes are based on ductility:

L - Low ductility; applying to cold drawn products. 

N - Normal ductility; the reinforcing class for non-seismic areas, this product is commonly used in Australia. 

E - Earthquake (seismic) ductility; the reinforcing class for seismic areas principally used in New Zealand.

Dusctility - The ability of a structure to deform plastically under load without fracture yet still fulfil a load carrying function. If structure cannot withstand large deformations and deflections when overloaded, then it is subject to brittle failure.

Table - Chemical composition

Steel Grade	C	SI	Mn	P	S	N21	Ceq
D500N	0,22			0,050	0,050		0.44
R250N	0,22			0,050	0,050		0,44
D250N	0,22			0,050	0,050		0,44
D500L	0,22			0,050	0,050		0,46
R500L	0,22			0,050	0,050		0,46
GR 500 E	0,22			0,050	0,050		0,49

Where Carbon Equivalent CEq = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

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