Page 3 - A4 Post tensioning bar 1030

Macalloy Post Tensioning System

Steel Quality to ensure that the steel achieves in lengths up to 6m for all
the mechanical properties stated diameters from 20mm to 75mm.
in table 2. Rigorous inspection and
Macalloy 1030 is a carbon-chrome
steel with a composition designed testing is carried out, both during Macalloy S1030 has very good
to give the specified properties. All and after treatment, to ensure general corrosion properties, similar
bars are hot rolled. Diameters from consistent tensile properties. The to grades 1.4305 (303) and 1.4301
25mm to 40mm are cold worked mechanical performance of the bar (304) austenitic stainless steel bars.
by stretching. The stretching load is monitored through the tensile In industrial atmospheres some
and permanent elongation are testing of machined specimens surface discolouration may occur
predetermined by preliminary tests rather than section testing. over a period of time.
and the properties are monitiored
during production to ensure that Macalloy S1030 Macalloy S1030 is a martensitic
the bars as supplied comply nickel-chrome alloy steel, hardened
in all respects with the provisions Stainless Macalloy S1030 bars in during manufacture to attain
of BS4486. diameters from 20mm to 75mm are the specified properties.
made from precipation hardened
Bars of 50mm and 75mm diameter stainless steel. The mechanical properties of
are heat treated after rolling at a both Macalloy 1030 and S1030 bars
controlled temperature and time Macalloy S1030 bars are available are listed in table 2.

Table 2: Mechanical Properties

Nominal ultimate Nominal 0.1% Minimum Approximate modulus
Grade tensile strength proof stress elongation of elasticity
N/mm 2 N/mm 2 % kN/mm 2
Macalloy 1030 25-40mm 1030 835 6 170*
Macalloy 1030 50-75mm 1030 835 6 205
Macalloy S1030 20-75mm 1030 835 10 185
*Secant Modulus of Elasticity in range 5 - 70% UTS

Izmit Bay Bridge, Turkey
Main Contractor IHI

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