PC Bar (Steel Bar for Prestressed Concrete)

Features

PC BAR is manufactured basically in accordance with KS D 3505 or JIS G 3109-1988

Characteristics are as follows:

Superior yield ratio
It has more than 90% yield ratio much higher than 80% that is required by pc steel bar.

Bond properties
PC BAR, with 3 to 6 spiral grooves on its surface, has characterstic of good bond which gives powerful adhesion that is incomparable to average tension bar.

Low relaxation
The relaxation loss which is the reduction in load within concrete after prestress in normal room temperature is under 1.5% in 10hours and under 4% in long term.

Exceptional straightness
PC BAR is wound in a coil within the elastic limit of Steel. When it is uncoiled, it straightens itself. So there is on need for any straightening process.

Excellent spot-welding
The application of spot weld cage forming is used widely for poles and piles in korea and other countries, and achieved high productivity. By use of cage forming machine under appropriate welding procedure the decrease of PC BAR's mechanical properties after spot welding is very small.

Mechanical & Technological Properties

Mechanical Properties
Upon the request, it is possible to produce higher grade of steel than the grade 1275/1420

Nominal Dia. (mm)	Yield Load(min.) KN (Kgf)	Yield Strength(min.) KN/mm2 (Kgf/mm2)	Tensile Load(min.) KN (Kgf/mm2)	Tensile Strength(min.) KN (Kgf/mm2)	Elongation min. %	Relaxation max.
						1) %, 10hrs.	2) %, 1000hrs.
5.1	26.3 (2680)	1.3 (130)	28.0 (2850)	1.4 (145)	5	1.5	4.0
6.1	37.9 (3860)		40.2 (4100)
7.4	53.4 (5450)		56.9 (5800)
8.3	70.1(7150)		74.7 (7615)
9.2	84.8 (8650)		91.0 (9280)
11.0	118.7 (12100)		128.0 (13050)
13.0	164.8 (16800)		177.8 (18125)

* Gauge length : nominal diameter x 8
* Relaxation Value : Initial load =

1. 80% of yield load at normal temperature.
2. 70% of tensile load at normal temperature.

Dimensions

* Weight units is derived from taking density as 7.85g/cm³

* Please refer to the linked site (E-book) for more informaiton