25mm Thick ASTM A36 Mild Ms Steel Plate Hot Rolled Q345b Q345r Carbon Steel Sheet Plate

Q345 is made of steel. It is low alloy steel (C< 0.2%), good comprehensive performance, good low temperature performance, cold stamping performance, welding performance and machinable performance. Widely used in Bridges, vehicles, ships, construction, pressure vessels and so on. Q represents the yield of this material. 345 after it refers to the yield value of this material, which is about 345MPa. And the yield value will decrease with the increase of material thickness.

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Differences between Q235 and Q345
Different: the lower limit of yield strength of Q235 is 235mpa, the lower limit of yield strength of Q345 is 345mpa (the meaning of Q is the Chinese character "qu", the following value represents the lower limit of yield strength)

The two alloy content is different: Q235 is ordinary carbon steel, Q345 is low alloy steel. (Compare with the old standard 1591-88:12MNV, 16MN16MNRe, 18NB, 14MNNB)

Performance and Application
Q235-- Metal structural parts, carburized or cyanided parts with low core strength requirements, pull rods, connecting rods, hooks, couplings, bolts and nuts, sleeves, shafts and welds.

Q345 - good comprehensive mechanical properties, low temperature performance may also, plasticity and good weldability, used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, Bridges under moving load of the structure, mechanical parts, building structure, general metal parts, hot rolled or normalizing state, can be used in various structure below 40 ℃ cold areas.

If the structure is strength control, can consider using Q345 if the structure is stiffness control, can consider using Q235 price Q345 is a little more expensive, but because of its high strength, can save material. Specific selection can be compared from the above points.

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