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低合金高強度結構鋼 GB/T 1591-9４

牌號等級		化學成份（%）
		Mn	Si≤	P ≤	S ≤	V	Nb	Ti	C ≤	Al≥	Cr≤	Ni≤
Q295	A	0.80-1.50	0.55	0.045	0.045	0.02-0.15	0.015-0.06	0.02-0.20	0.16
Q295	B	0.80-1.50	0.55	0.040	0.040	0.02-0.15	0.015-0.06	0.02-0.20	0.16
Q345	A	1.00-1.60	0.55	0.045	0.045	0.02-0.15	0.015-0.06	0.02-0.20	0.02-0.20
Q345	B	1.00-1.60	0.55	0.040	0.040	0.02-0.15	0.015-0.06	0.02-0.20	0.02-0.20
Q345	C	1.00-1.60	0.55	0.035	0.035	0.02-0.15	0.015-0.06	0.02-0.20	0.02-0.20	0.015
Q345	D	1.00-1.60	0.55	0.030	0.030	0.02-0.15	0.015-0.06	0.02-0.20	0.18	0.015
Q345	E	1.00-1.60	0.55	0.025	0.025	0.02-0.15	0.015-0.06	0.02-0.20	0.18	0.015
Q390	A	1.00-1.60	0.55	0.045	0.045	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20		0.30	0.7
Q390	B	1.00-1.60	0.55	0.040	0.040	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20		0.30	0.7
Q390	C	1.00-1.60	0.55	0.035	0.035	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.30	0.7
Q390	D	1.00-1.60	0.55	0.030	0.030	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.30	0.7
Q390	E	1.00-1.60	0.55	0.025	0.025	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.30	0.7
Q420	A	1.00-1.70	0.55	0.045	0.045	0.02-0.20	0.015-0.06	0.02-0.20	.02-0.20		0.4	0.7
Q420	B	1.00-1.70	0.55	0.040	0.040	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20		0.4	0.7
Q420	C	1.00-1.70	0.55	0.035	0.035	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.4	0.7
Q420	D	1.00-1.70	0.55	0.030	0.030	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.4	0.7
Q420	E	1.00-1.70	0.55	0.025	0.025	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.4	0.7
Q460	C	1.00-1.70	0.55	0.035	0.035	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.7	0.7
Q460	D	1.00-1.70	0.55	0.030	0.030	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.7	0.7
Q460	E	1.00-1.70	0.55	0.025	0.025	0.02-0.20	0.015-0.06	0.02-0.20	0.02-0.20	0.015	0.7	0.7