Q345D low alloy steel plate

Q345D is a low alloy steel plate
Executive standard: GB/T1591-2008 "Low Alloy High Strength Structural Steel"

Q345D steel is compared with Q345A, Q345B, Q345C steel. Low temperature impact energy test temperature (-20℃ minimum 27J)

Q345D has good mechanical properties. The amount of harmful substances P and S is lower than that of Q345A, B, and C. The market price is higher than Q345A,Q345B, Q345C.

The grade of Q345D steel consists of three parts: the Chinese pinyin letters representing the yield strength, the yield strength value, and the quality grade symbol, for example:
Q—the first letter of the Chinese pinyin of the word "Qu" for the yield strength of steel;
345—Yield strength value, in MPa;
D—Quality grade is D (grades are divided into A, B, C, D, E).

Q345D steel Chemical composition:

Grade	C	Si	Mn	P	S	Nb	V
Q345D	≤0.18	≤0.50	≤1.70	≤0.030	≤0.025	≤0.07	≤0.15
Grade	Ti	Cr	Ni	Cu	N	Mo	Al
Q345D	≤0.20	≤0.30	≤0.50	≤0.30	≤0.012	≤0.10	≥0.015

Q345D steel Mechanical properties:

Yield strength									Tensile strength	Elongation	Impact test
≤16mm	16-40mm	40-63mm	63-80mm	80-100mm	100-150mm	150-200mm	200-250mm	250-400mm	450-630	≥21	-20℃: ≥34
≥345	≥335	≥325	≥315	≥305	≥285	≥275	≥275	≥265

When the purchaser requires the steel plate to have through-thickness properties, a symbol representing the through-thickness (Z-direction) performance level shall be added after the above-specified grade, for example: Q345DZ15.

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