Q345qDNH steel plate for railway or highway bridge

The Q345qDNH steel grade is composed of the Chinese phonetic alphabet representing the yield strength, the minimum yield strength value specified, the Chinese phonetic alphabet first letter of the bridge (resistance, weathering) character, and the quality grade symbol.

345-Specify the minimum yield strength value, in MPa;
q-The first letter of the Chinese phonetic alphabet of the word "bridge" used for bridge steel;
N-The first letter of the Chinese phonetic alphabet of the word "Nei";
H-The first letter of the Chinese phonetic alphabet of "hou";
D-The quality level is D level.

Chemical composition of Q345qDNH steel plate:

Chemical composition (mass fraction)%
C	SI	Mn	Nb	V	TI	Cr	NI	Cu	Mo	N	ALs
									no greater than
≤0.11	0.15-0.5	1.1-1.5	0.01-0.1	0.01-0.1	0.006-0.03	0.4-0.7	0.3-0.4	0.25-0.5	0.1	0.008	0.015-0.05

Notes:
1. Al, V, Ti can be added individually or in combination. When adding in combination, the content of at least one alloy element should reach the lower limit specified in the table, and Nb+V+TI≤0.22%.
2. Ca treatment is required to control the sulfide form.
3. The lower limit of Mn content can reach 0.50% when the coil is delivered
4. When the total aluminum (Alt) content is used for calculation, the total aluminum content should be 0.020%-0.055%.

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