MECHANICAL PROPERTIES OF ASTM
Name	Grade	Yield Point N/mm²	Tensile Strength N / mm²	Ratio	Bar No.	Elongation %
ASTM A615	Gr40	280 min	420 min	—	3 4.5.6	11 min 12 min
	Gr60	420 min	620 min	—	3	9 min
					4.5.6	9 min
					7	8 min
					8	8 min
					9	7 min
					10	7 min
					11	7 min
					14	7 min
					18	7 min
ASTM A706		420~540	550 min	1.25 min	3-6 7-11 14,18	14 min 12 min 10 min

MECHANICAL PROPERTIES OF CNS
Grade	Yield Point N / mm²	Tensile Strength N / mm²	Ratio	Test Piece	Elongation %
SD280	280 min	420 min	—	No. 2 No.14A	18 min 19 min
SD280W	280～380	420 min	1.25 min	No. 2 No.14A	18 min 19 min
SD420	420 min	620 min	—	No. 2 No.14A	13 min 14 min
SD420W	420~540	550 min	1.25 min	No. 2 No.14A	13 min 14 min
SD490W	490~615	620 min	1.25 min	No. 2 No.14A	13 min 14 min
SD550W	550~675	690 min	1.25 min	No. 2 No.14A	12 min 13 min

Cmemical content of steel bars
Grade	Product	Manufacture	Chemical content(%)
Grade	Product	Manufacture	C	Mn	P	S	Si	C.E.
SD280	Reinforcement bar	Hat rolling	—	—	0.060 max	0.060 max	—	—
SD280W			0.33 max	1.56 max	0.043 max	0.053 max	0.55 max	0.55 max
SD420			0.34 max	1.60 max	0.060 max	0.060 max	0.55 max	0.59 max
SD420W			0.33 max	1.56 max	0.043 max	0.053 max	0.55 max	0.55 max
SD490W			0.33 max	1.56 max	0.043 max	0.053 max	0.55 max	0.55 max
SD550W			0.33 max	1.56 max	0.043 max	0.053 max	0.55 max	0.55 max
C.E.(carbon equivalent) = [ C + Mn/6 + Cu/40 + Ni/20 + Cr/10 - M0/50 - V/10 ] %