Classification of Round Bars

Classification Designation Equivalent Standard
GOST ASTM JIS
Deformed bars Aj340 All A615G40 SD35
Aj400 All A615G60 SD40

Physical Specification of Round Bars

Nominal Diameter Diameter of Round Bar Diameter Tolerance Sectional Area Unit Weight Wehit tolerance (%)
mm mm mm mm2 kg
8 8 +0.3
-0.5 		50.3 0.395 ±8
10 10 78.5 0.616 ± 5.5
12 12 113.1 0.888
14 14 154 1.21
16 16 +0.4
-0.5 		201 1.58 ±4.5
18 18 254 2
20 20 314 2.47
22 22 380 2.98
25 25 +0.4
-0.6 		491 3.85
28 28 616 4.83
32 32 +0.4
-0.7 		804 6.31

Chemical Composition of Round Bars

Classification Designation Maximum Chemical Composition of Deformed Bars
C SI Mn P S
Deformed bars Aj340 0.34 0.65 1.40 0.055 0.055
Aj350 0.30 0.60 1.66 0.045 0.045
Aj400 0.40 0.65 1.70 0.05 0.05
Aj420 0.33 0.60 1.55 0.045 0.045

Mechanical Properties of Round Bars

Designation Classification Tensile Cold Bending Test
Min yield point (Y.P.) N/(mm)2 Min tensile strength N/(mm)2 Ratio of UTS to YP (%) Min elongation % Bend mandrel diameter in terms of nominal diameter
Min Max Min min Min d<16 16< d <32 32< d <50
Deformed Bars Aj 340 340 500 1.25 18 3d 6d 7d
Aj 350 350 455 500 7
Aj 400 400 600 16
Aj 420 420 454 600 16