THÀNH PHẦN HÓA HỌC

Thành phần hóa học
Steel bars
Tiêu chuẩn Standard	Mác thép Grade	Thành phần hóa học Chemical Composition
Tiêu chuẩn Standard	Mác thép Grade	C	Si	Mn	P (max)	S (max)
TCVN 1651 – 85 (1765 – 85 )	CT33	0.06 – 0.12	0.12 – 0.30	0.25 – 0.50	0.04	0.045
	CT34	0.09 – 0.15	0.12 – 0.30	0.25 – 0.50	0.04	0.045
	CT38	0.14 – 0.22	0.12 – 0.30	0.40 – 0.65	0.04	0.045
	CT42	0.18 – 0.27	0.12 – 0.30	0.40 – 0.70	0.04	0.045
	CT51	0.28 – 0.37	0.15 – 0.35	0.50 – 0.80	0.04	0.045
TCVN 3104 – 79	25Mn2Si	0.20 – 0.29	0.60 – 0.90	1.20 – 1.60	0.04	0.045
TCVN 3104 – 79	35MnSi	0.30 – 0.37	0.60 – 0.80	0.80 – 1.20	0.04	0.045
JIS G3505 2004	SWRW10	0.13 max	0.30 max	0.06 max	0.04	0.04
JIS G3505 2004	SWRW12	0.15 max	0.30 max	0.065 max	0.04	0.04
JIS G3112	SD 295A				0.05	0.05
	SD 345	0.27 max	0.55 max	1.60 max	0.04	0.04
	SD 390	0.29 max	0.55 max	1.80 max	0.04	0.04
	SD 490	0.32max	0.55max	1.80max	0.040	0.040
ASTM A615 /A615M – 94	Gr 40	0.21 max	0.40 max	1.35 max	0.04	0.05
ASTM A615 /A615M – 94	Gr 60	0.30 max	0.50 max	1.50 max	0.04	0.05
BS 4449	Gr 250	0.25 max	0.50 max	1.50 max	0.06	0.06
BS 4449	Gr 460	0.25 max	0.50 max	1.50 max	0.05	0.05
ΓOCT 5780 – 82	25Γ2C	0.20 – 0.29	0.60 -0.90	1.20 – 1.60	0.04	0.045
ΓOCT 5780 – 82	35ΓC	0.30 – 0.37	0.60 – 0.80	0.80 – 1.20	0.04	0.045
ΓOCT 380 – 71	CT2	0.09 – 0.15	0.12 – 0.30	0.25 – 0.05	0.045	0.045
	CT3	0.14 – 0.22	0.12 – 0.30	0.40 – 0.60	0.045	0.045
	CT4	0.18 – 0.27	0.12 – 0.30	0.40 – 0.70	0.045	0.045
	CT5	0.29 – 0.37	0.15 – 0.35	0.50 – 0.80	0.045	0.045

TÍNH CHẤT CƠ LÝ

Tiêu chuẩn Standard	Mác thép Grade	Độ bền cơ lý Mechanical Properties
Tiêu chuẩn Standard	Mác thép Grade	Giới hạn chảy Yeild Point (N/mm2)	Giới hạn bền kéo Tensile Strength (N/mm2)	Độ giãn dài Elongation (%)
TCVN 1651 – 85 (1765 – 85 )	CT 33	240 min	–	–
	CT 34	230 min	340 ÷ 440	32 min
	CT 38	250 min	380 ÷ 490	26 min
	CT 42	270 min	420 ÷ 540	24 min
BS 4449	Gr 250	250 min	287 min	22 min
BS 4449	Gr 460	460 min	483 min	12 min
ΓOCT 380 – 89	CT2	196 min	334 ÷ 412	26 min
	CT3	225 min	373 ÷ 461	22 min
	CT4	245 min	412 ÷ 510	20 min
	CT5	265 min	490 ÷ 608	16 min
JIS G3101 1995	SS 330	235 min	330 ÷ 430	25 min
JIS G3101 1995	SS 400	235 min	400 ÷ 510	21 min
JIS G3106 1995	SM400 A	235 min	400 ÷ 510	23 min
ASTM 1997	A 36	250	400 ÷ 550	20 min
BS 4360 1986	40B	245	340 ÷ 550	22
BS 4360 1986	40C	245	340 ÷ 550	22
DIN 17100	RST37-2	225	340 ÷ 470	26
GB700 – 88	Q235A	225 min	375 min	21 min
	Q235B	225 min	375 min	21 min
	Q235C	225 min	375 min	21 min
	Q235D	225 min	375 min	21 mi

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