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成分對照編輯

牌號	C	Si	Mn	P	S	V	Nb	Al	Ti
Q345A	≤0.20	≤0.55	1.00-1.60	≤0.045	≤0.045	0.02-0.15	0.015-0.060		0.02-0.20
Q345B	≤0.20	≤0.55	1.00-1.60	≤0.040	≤0.040	0.02-0.15	0.015-0.060		0.02-0.20
Q345C	≤0.20	≤0.55	1.00-1.60	≤0.035	≤0.035	0.02-0.15	0.015-0.060	≥0.015	0.02-0.20
Q345D	≤0.18	≤0.55	1.00-1.60	≤0.030	≤0.030	0.02-0.15	0.015-0.060	≥0.015	0.02-0.20