Product Guide


Rebar Grades   [Top]

Our products are made in accordance with Philippine National Standards for Steel Bars for Concrete Reinforcement, under PNS-49:2002.


Specifications and Grading   [Top]

The three grades under this specification – namely, Grades PNS 230, 275, and 415 –trace their roots to ASTM specifications. And the terms ‘Structural’, ‘Intermediate’, and ‘High-tensile’ originated from earlier versions of ASTM-A615 but remained unchanged in deference to custom and familiarity among users. The table below provides a handy reference as to the common understanding in the market regarding these grades.

ASTM vs PNS Codes Popular Nomenclature Typical Application
Grade 33 / PNS 230 Structural Grade Low-rise Buildings and Low Loading Conditions
Grade 40 / PNS 275 Intermediate Grade Medium-rise Structures / Infrastructure Work
Grade 60 / PNS 415 High-Tensile Grade Medium & High-rise Structures / Infrastructure

The three grades are distinguished by the different color markings painted at the ends of each bar, as shown in the following table:


Weldability of a Rebar   [Top]

It must be noted that, in the current PNS 49, rebars are further categorized into ‘weldable’ and ‘non-weldable’ grades. The difference between the two categories is primarily rooted in their different chemical compositions and carbon equivalents (CEQ). Despite the different nomenclatures and their connotations, both ‘Weldable’ and ‘Non-weldable’ grades can actually be welded. However, the relatively lower carbon content and CEQ of the so-called ‘weldable’ grade does make it easier to weld without having to worry about pre-heating and post-heating requirements and procedures, that is a concern highlighted especially in temperate situations.




Rebar Sizes   [Top]

The standard sizes that the Company manufactures and sells are as follows: 10mm, 12mm, 16mm, 20mm, 25mm, 28mm, 32mm, and 36mm. For special orders, it can also make 40mm and 50mm bars.


The Nominal Size of a Rebar   [Top]

For both the plain round bar and the rebar, the word ‘size’ and nominal diameter are used interchangeably.

For a rebar, alternatively known as a ‘deformed steel bar’, its ‘size’ specifically refers to the size of a plain round bar having the same weight per meter as the rebar.

A specific ‘size’ of plain round bar refers to its nominal diameter. This ‘size’ also refers to the diameter of a circular plain round bar having a certain unit mass or weight per meter.

A plain round bar and a rebar of the same ‘size’ will have the same unit mass or weight per meter of bar.


The Proper Way of Measuring a Plain Round Bar   [Top]

For a plain round bar, determining its 'size' involves simply taking a direct physical measurement of its diameter since its circular cross section should remain quite uniform throughout its length. A plain round bar is considered to be dimensionally acceptable if its diameter, as measured, falls within the dimensional tolerances allowed by the Standard.


The Proper Way of Measuring a Rebar   [Top]

A rebar however is not measured in the same way as a plain round bar. Because of its non-uniform cross section, a rebar must comply with the allowable ‘Variation in Mass’ (VIM) in lieu of measurement of its diameter. Checking for this VIM involves taking and weighing one meter of rebar and comparing the findings against the standard value.




Weight Tolerance   [Top]

Because variation in cross sectional area occurs during hot rolling, a corresponding variation in linear weight is to be expected. For this reason, PNS-49 provides for an allowable ‘variation in mass’ (VIM) of ±6%, measured using one meter of rebar.


Length Tolerance   [Top]

The cut length of a rebar varies as well because of shrinkage as it cools down. The standard however limits this shrinkage, and the minimum lengths of the finished rebar are shown below.

Std. Length (m) Min. Acceptable Length (m)
6.0 5.960
7.5 7.453
9.0 8.935
10.5 10.440
12.0 11.940

Our rebar comes in these commercial lengths: 6.0, 7.5, 9.0, 10.5, and 12.0 meters. Special lengths of 13.5 and 15.0 meters are subject to special orders and negotiations.




Mechanical Property Specifications   [Top]

MECHANICAL PROPERTIES
Class Grade Yield Strength, MPa min. Tensile Strength, MPa min. Specimen Elongation in 200mm, % min. Bending Angle Diameter of Pin (d = nominal diameter of specimen)
Hot-Rolled Non-Weldable Deformed Steel Bar 230 230 390 D<25mm
D≥25mm
18
16
180 3d
4d
275 275 480 D<25mm
D≥25mm
10
8
180 4d
5d
415 415 620 D<25mm
D≥25mm
8
7
180 5d
6d
Hot-Rolled Weldable Deformed Bar 230 230 390 D<25mm
D≥25mm
20
18
180 3d
4d
275 275 480 D<25mm
D≥25mm
16
14
180 4d
5d
415 415* 550** D<25mm
D≥25mm
14
12
180 5d
6d

 * Maximum yield strength of Weldable steel bars shall not exceed 540 MPa
** Tensile strength shall not be less than 1.25 times the actual yield strength


Surface Deformations Specifications   [Top]

DEFORMATION REQUIREMENTS
Nominal Diameter Max. Average Spacing of Lugs Height Tolerance of Lugs Max. Summation of Gaps (mm)
Minimum Maximum
10 7.0 0.4 0.8 7.8
12 8.4 0.5 1.0 9.4
16 11.2 0.7 1.4 12.6
20 14.0 1.0 2.0 15.7
25 17.5 1.2 2.4 19.6
28 19.6 1.4 2.8 22.0
32 22.4 1.6 3.2 25.1
36 25.2 1.8 3.6 27.5


Table of Standard Weights   [Top]

STANDARD WEIGHT OF DEFORMED ROUND STEEL BARS
Bar Diameter
∅mm
Unit Weight
Kg/m
Bar Commercial Length
6.0 m 7.5 m 9.0 m 10.5 m 12.0 m
10 0.616 3.696 4.620 5.544 6.468 7.392
12 0.888 5.328 6.660 7.992 9.324 10.656
16 1.578 9.468 11.835 14.202 16.569 18.936
20 2.466 14.796 18.495 22.194 25.893 29.592
25 3.853 23.118 28.898 34.677 40.457 46.236
28 4.834 29.004 36.255 43.506 50.757 58.008
32 6.313 37.878 47.348 56.817 66.287 75.756
36 7.990 47.940 59.925 71.910 83.895 95.880