Reinforcement Steel Bars (Rebar)

Rebar Specification

Characteristics

BS 4449:2005

BS 4449:2005

ASTM A615

ASTM A615

ASTM A615

QS600

ISO 6935-2

SASO ASTM

Gr B500B

Gr B500C

Gr 60

Gr 75

Gr 80

(YS>600MPa)

:2007

A615:2015

B500B-R

Chemical Composition

Carbon (C) %

0.22 Max

0.22 Max

—

—

—

0.32 Max

0.32 Max

—

Phosphorous

0.05 Max

0.05 Max

0.05 Max

0.05 Max

0.05 Max

0.05 Max

0.060

0.05 Max

(P) %

Sulphur (S) %

0.05 Max

0.05 Max

0.05 Max

0.05 Max

0.05 Max

0.05 Max

0.060

0.05 Max

Nitrogen (N) ppm

120 Max

120 Max

120 Max

120 Max

120 Max

120 Max

120 Max

120 Max

CE (%)

0.48 Max

0.48 Max

—

—

—

—

—

—

Mechanical & Physical Properties

Yield Strength,

500 – 650

500 – 650

420

520

550

600

500

420

MPa (min)

Tensile Strength,

—

—

620

690

725

740

—

620

MPa (min)

TS/YS (min)

1.08

>=1.15, <1.35

—

—

—

—

1.08

—

Elongation (%), (min)

—

—

9

7

7

7

14

9

Agt (%) (min)

5

7.5

—

—

—

—

5

—

Bend Angle

90°

90°

180°

180°

180°

180°

90°

180°

Re-bend

From 90°

From 90°

—

—

—

—

From 90º

—

Angle

Back by

Back by

Back by

at least 20º

at least 20º

at least 20º

Weldability

Weldable /

Weldable

Weldable

Non – Weldable

Non – Weldable

Non – Weldable

Non – Weldable

Non – Weldable

Non – Weldable

Non-Weldable

Application

RCC

RCC Construction in seismic zone

RCC

RCC

High Raise Towers

High Raise Towers / Highly

RCC

RCC

Construction

Construction

Construction

loaded RCC structure

Construction

Construction

Note: Bend and Rebend tests are performed as specified in respective standards using proper mandrel diameters

Technical Features

BS4449:2005 GrB500B rebars are produced with low carbon equivalent & Weldable, whereas ASTM A615 Gr60, Gr75, Gr80, QS600, ISO 6935-2:2007 B500B-R and SASO ASTM A615:2015 are Non-Weldable

BS4449:2005 GrB500B rebars have High Strength Compared to ASTM A615 Gr60 which reduce steel consumption & congestion in structure, in turn reduces overall cost of project

BS4449:2005 GrB500B rebars have better bend performance, due to severe bend & re-bend angle. Rebars confirming to BS 4449:2005 specification are subjected to fatigue testing and survive minimum 5 million stress cycles.

BS4449:2005 GrB500B rebars have High Yield Strength i.e., minimum 500 Mpa compared to ASTM A615 Gr60, without compromising on ductility

BS4449:2005 GrB500B rebars have High Yield Strength i.e., minimum 500 Mpa compared to ASTM A615 Gr60, without compromising on ductility

QS 600 with yield strength > 600 MPa. Over the years, rebar with yield strength 420 MPa, 500 MPa etc., confirming to BS 4449 / ASTM A615 specification were available in Qatar/GCC region. Rebar with higher strength i.e., YS > 600 MPa will reduce the steel consumption by around 20% in construction, which in term lowers the overall cost of structure using QS 600 grade can also lead to reduction in column size of heavily loaded structure and there is relief from rebar congestion.

Nominal Dimensions, Weight & Tolerance On Knots

Designation

Nominal Dia. (d)

Nominal Cross Section Area

Unit Mass

Maximum of Average Knot Space

Height of Knot

Ltgd/Ri Width

Nominal Mass (kg/piece)

(mm)

(mm2)

(kg/m)

(mm)

Min (mm)

Max (mm)

(mm)

6m

9m

12m

D8

8

50.27

0.395

5.6

0.3

0.6

3.14

2.37

3.56

4.74

D10

10

78.54

0.617

7.0

0.4

0.8

3.9

3.7

5.55

7.40

D12

12

113.1

0.888

8.4

0.5

1.0

4.7

5.33

7.99

10.66

D14

14

153.9

1.21

9.8

0.6

1.2

5.5

7.26

10.89

14.52

D16

16

201.1

1.58

11.2

0.7

1.4

6.3

9.48

14.22

18.96

D18

18

254.5

2.00

12.6

0.8

1.6

7.1

12.00

18.00

24.00

D20

20

314.2

2.47

14.0

1.0

2.0

7.9

14.82

22.23

29.64

D22

22

380.1

2.98

15.4

1.1

2.2

8.6

17.88

26.82

35.76

D25

25

490.9

3.85

17.5

1.3

2.6

9.8

23.10

34.65

46.20

D28

28

615.8

4.83

19.6

1.4

2.8

11.0

28.98

43.47

57.96

D30

30

706.9

5.55

21.0

1.5

3.0

11.8

33.30

49.95

66.60

D32

32

804.2

6.31

22.4

1.6

3.2

12.6

37.86

56.79

75.72

D36

36

1017.9

7.990

25.2

1.8

3.6

14.1

47.94

71.99

95.88

D40

40

1256.6

9.864

28.0

2.0

4.0

15.7

59.18

88.78

118.37

Requirement for rib geometry

The projection of transverse ribs shall extend over at least 75% of circumference of the product which shall be calculated from the nominal diameters.

Height of transverse ribs 0.03d to 0.15d

Longitudinal rib:

Rib spacing,c 0.4d to 1.2d

Where longitudinal rib are present, there height shall not exceed 0.10d, where d is the nominal diameter of the product.

Rib inclination, ß 35° to 75°

Rebar Marking

Deformed bars produced at Qatar Steel conform to various national and international standards such as, BS 4449:2005 Grade B500B/Grade B500C (Nuclear Grade & British), SASO ASTM A615:2015, ASTM A615 Grade 40/Grade 60/Grade 75/Grade 80 (American) & QS 600 (Qatar Steel High strength rebar).