Rebar Grades | PDF | Economic Sectors

The three grades under this specification

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&#;

namely, Grades PNS 230, 275, and 415

&#;

trace

their roots to ASTM specifications. And the terms &#;Structural&#;, &#;Intermediate&#;, and &#;High

-

tensile&#; or

iginated 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

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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

Product Guide

THE PAG-ASA REBAR   [Top]

Pag-asa Steel rebar products are identifiable through the Company Logo ("PSW", short for Pag-asa Steel Works), which is hot-rolled and embossed onto each bar at specified intervals. The Rebar Size mark, which specifies the nominal diameter of the bar, as well as the Grade, Ductility, and Manufacturing Process marks are also hot-rolled adjacent to the company logo.

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Pag-asa Steel pioneered the practice of placing its logo on its bars in , before it was mandated by law. The Bureau of Product Standards of the Department of Trade and Industry of the Philippines now requires all rebar manufacturers to put identifying marks on their bars.

Rebar Grade
PNS 49: Rebar
Grade Mark Ductility Class
(Mark) Manufacturing Process
(Mark) Grade 230 2 Regular (R) - Grade 280 3 Regular (R)
or Weldable (W) - Grade 420 4 Regular (R)
or Weldable (W) Quenched & Tempered / QT (T)
or Microalloyed / MA (A) Grade 520 5 Regular (R) Quenched & Tempered / QT (T)
or Microalloyed / MA (A) Grade 550 6 Regular (R)
or Weldable (W) Quenched & Tempered / QT (T)
or Microalloyed / MA (A)

STANDARDS   [Top]

Pag-asa Steel produces superior reinforcing steel bars in an array of sizes, lengths, and grades in adherence to Philippine National Standard (PNS 49:), as well as the global ASTM Standard (ASTM A615/A706) established by the American Society for Testing and Materials (now known as ASTM International).

Standards Grades PNS 49: GR 230 GR 280 GR 420 GR 520 GR 550 ASTM A615 EQUIVALENT GR 33 GR 40 GR 60 GR 75 GR 80 ASTM A706 EQUIVALENT - - GR 60 - GR 80

The PNS 49 grade names come from the minimum yield strength of the bars, as measured in megapascals (MPa). For instance, a standard Grade 420 bar has a minimum yield strength of 420 MPa.

The ASTM International grades are also based on yield strength, but are primarily expressed in pounds per square inch (psi). For instance, a standard Grade 60 bar has a minimum yield strength of 60,000 psi [equivalent to 420 MPa], and is designated as "Grade 60 [420]" in the standard.

For simplicity, psi-based designations are used here when referencing the ASTM International standard.

BAR SIZES   [Top]

Pag-asa Steel manufactures and sells the following standard sizes (in nominal diameters): 10mm, 12mm, 16mm, 20mm, 25mm, 28mm, 32mm, and 36mm. Larger sizes such as 40mm and 50mm bars may be produced via special order.

Nominal Diameter, mm 10 12 16 20 25 28 32 36 40 50

For steel bars, the terms "size" and "nominal diameter" are used interchangeably.

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 piece of steel bar.

COMMERCIAL LENGTHS   [Top]

Pag-asa Steel rebars come in the following commercial lengths: 6.0m, 7.5m, 9.0m, 10.5m, and 12.0 m. Special lengths of 13.5 and 15.0 meters may be produced via special order.

Commercial Length, m Special Length, m 6.0 7.5 9.0 10.5 12.5 13.5 15.0

The cut length of a rebar should not be shorter than the specified commercial lengths according to the PNS 49: standards. The specified tolerance for length is zero (0), + 60 mm.

GRADES   [Top]

Pag-asa Steel rebars comes in the following grades to meet high-tensile, intermediate, and low-tensile building requirements.

PNS 49: ASTM Equivalent Popular Nomenclature Typical Application Grade 230 Grade 33 Structural Grade Low-rise Buildings and Low Loading Conditions Grade 280 Grade 40 Intermediate Grade Medium-rise Structures / Infrastructure Work Grade 420 Grade 60 High-Tensile Grade Medium & High-rise Structures / Infrastructure Grade 520 Grade 75 High-Tensile Grade Medium & High-rise Structures / Infrastructure Grade 550 Grade 80 High-Tensile Grade Medium & High-rise Structures / Infrastructure

Rebar grade are embossed on the bars in addition to different color markings painted at the ends of each bar, as shown in the following table:

Ductility Class PNS Standards ASTM Equivalent Color Code Class 1
Regular
Steel Bar 230R 33

*

280R 40

*

420R 60

*

520R 75

*

550R 80

*

Class 2
Weldable
Steel Bar 280W 40

**

420W 60

**

550W 80

**

* At both ends of the bar ** One color per end of the bar
Reference: Philippine National Standard (PNS 49:)

Please refer to the chart below to see the properties of different rebar grades, as outlined in the Philippine National Standard and ASTM Standard.

Download the PDF version of the Rebar Grade Comparison.

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