Grade expression method: The steel grade consists of three parts: the Chinese phonetic alphabet representing the yield strength, the yield strength value, and the quality grade symbol. For example: Q345B, where:
Q-The first letter of the Chinese Pinyin of "qu" for the yield strength of steel;
345-Yield strength value, unit MPa;
B-Quality grade is B grade.
When the buyer requires the steel plate to have thickness direction performance, the symbol representing the thickness direction (Z direction) performance level is added after the above-mentioned grades, for example: Q345BZ15.
Executive standard: implement GB/T1591-2008.
Q345B steel plate is a kind of steel material. It is a low-alloy steel (c<0.2%) with good overall performance, good low temperature performance, cold stamping performance, welding performance and machinability. It is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. q represents the yield of this material, and 345 in the back refers to the yield value of this material, around 345mpa. And as the thickness of the material increases, its yield value decreases.
Technical Requirements & Additional Services for Q345B steel plate:
Low temperature impacting test
Cutting and welding as per end user's demands
More striction on some chemical elements contains
Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
Ultrasonic test under GB/T2970,JB4730,EN 10160,ASTM A435,A577,A578
Chemical Compositions:
C：≤0.20%,
Si≤0.50%,
Mn：≤1.70%,
P≤0.035%,
S：≤0.035%,
Nb≤0.07%,
V：≤0.15%,
Ti≤0.20%,
Cr≤0.30%,
Ni：≤0.50%,
Cu：≤0.30%,
N：≤0.012%,
Mo：≤0.10%
Mechanical properties
Yield Strength:
≤16mm: ≥345,
16-40mm: ≥335,
40-63mm: ≥325,
63-80mm: ≥315,
80-100mm: ≥305,
100-150mm: ≥285,
150-200mm: ≥275.
Tensile strength: 450-630.
Elongation: greater than 17.
Impact test: Test temperature: 20°C: greater than 34.
