About grade Q345D,Q is the symbol for yield strength,345 means Q345D steel can bear a minimum yield strength of 345MPa.GB/T1591 Q345D steel is a kind of Carbon and Low-alloy High-strength Steel,GB/T1591 Q345D Steel Plate are used in Construction of Bridges, Highway Construction and Other Engineering construction.
345D low-alloy high-strength steel plates can be delivered in either normalized or Thermo mechanically rolled condition,GB/T1591 Q345D steel shall be done charpy V-notch impacting test under minus 20 centigrade.Many container manufacturers adpots these high tension strength to make offshore containers which can be used in deep oceans.
GB/T1591 Q345D Carbon and Low-alloy High-strength Steel Plate Chemical Composition and Mechanical Property
| Grade |
C % |
Si % |
Mn |
P % |
S % |
|
| Q345D |
≤ 0.18 |
≤ 0.55 |
1.00-1.60 |
≤ 0.030 |
≤ 0.030 |
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| Grade |
Thickness |
Yield Strength (Mpa) |
Tensile Strength |
Elongation |
Min Impact Energy |
| (mm) |
(MPa) |
(%) |
| Q345D |
≤16 |
345 |
470-630 |
22 |
-20 |
34J |
| |
>16-35 |
325 |
470-630 |
22 |
-20 |
34J |
| |
>35 |
295 |
470-630 |
22 |
-20 |
34J |
Q345B Adopt standard: GB-T1591 Standard Specification is for Rolled Steels for Welded Structure
Q345B Specification:Thickness: 1.2mm to 600mm; Width: 1220mm to 4200mm: Length: 5000mm to 18000mm
Third Party Inspection for Q345B:ABS, DNV, BV, GL, CCS, LR, RINA, KR, NK, CE, SGS, IKE, IEI or other quality department.
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