GB/T 1591 Standard Carbon Low-alloy Structural Steel

Description: GB/T 1591 is the standard for low alloy high strength structural steel. The GB/T 1591-2008 standard mainly includes the following grades of steel: Q345B, Q345C, Q345D, Q390C, Q390D and other different grades of steel. These grades of steel have high stren ...

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GB/T 1591 Standard Carbon Low-alloy Structural Steel description

GB/T 1591 is the standard for low alloy high strength structural steel. The GB/T 1591-2008 standard mainly includes the following grades of steel: Q345B, Q345C, Q345D, Q390C, Q390D and other different grades of steel.

These grades of steel have high strength and hardness and are widely used in the design, production and inspection of various high-strength structures, including bridges, buildings, ships, offshore platforms and other fields.

GB/T 1591 steel chemical components:

Designation	C	Si	Mn	P	S	Nb	V	Ti	Cr	Ni	Cu	N	Mo
Q345B	≤0.20	≤0.50	≤0.17	0.035	0.035	0.07	0.15	0.20	0.30	0.50	0.30	0.012	0.10
Q345C	≤0.20	≤0.50	≤0.17	0.03	0.03	0.07	0.15	0.20	0.30	0.50	0.30	0.012	0.10
Q345D	≤0.18	≤0.50	≤0.17	0.03	0.025	0.07	0.15	0.20	0.30	0.50	0.30	0.012	0.10
Q390C	≤0.20	≤0.50	≤0.17	0.03	0.03	0.07	0.20	0.20	0.30	0.50	0.30	0.015	0.10
Q390D	≤0.20	≤0.50	≤0.17	0.03	0.025	0.07	0.20	0.20	0.30	0.50	0.30	0.015	0.10

GB/T 1591 steel mechanical property:

Designation	Yield strength
Designation	≤16	16-40	40-63	63-80	80-100	100-150	150-200	200-250	250-400
Q345B	≥345	≥335	≥325	≥315	≥305	≥285	≥275	≥265	-
Q345C	≥345	≥335	≥325	≥315	≥305	≥285	≥275	≥265	-
Q345D	≥345	≥335	≥325	≥315	≥305	≥285	≥275	≥265	≥265
Q390C	≥390	≥370	≥350	≥330	≥330	≥310	-	-	-
Q390D	≥390	≥370	≥350	≥330	≥330	≥310	-	-	-

Designation	Tensile strength
Designation	≤40	40-63	63-80	80-100	100-150	150-250	250-400
Q345B	470-630	470-630	470-630	470-630	450-600	450-600	-
Q345C	470-630	470-630	470-630	470-630	450-600	450-600	-
Q345D	470-630	470-630	470-630	470-630	450-600	450-600	450-600
Q390C	490-650	490-650	490-650	490-650	470-620	-	-
Q390D	490-650	490-650	490-650	490-650	470-620	-	-

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