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The comparisons between hot rolled Q345 and Q235 steel plate

Both Q345 and Q235 steel plate are often manufactured with hot rolled manufacturing methods, and Q345 and Q235 steel can also be manufactured to be Q345 and Q235 steel sheet or coil.

Firstly, Q345 and Q235 steel plate chemical compositions are different as the following chart:

Steel Grade

C

Si

Mn

P

S

Q345B

≤0.20

≤0.50

≤1.70

≤0.035

≤0.035

Q235B

≤0.20

≤0.35

≤1.40

≤0.045

≤0.045

Secondly, mechanical properties of Q345 and Q235 steel plate are also different:

Steel Grade

Tensile strength

Yield strength

Elongation afrer fracture

Q345B

490-675Mpa

≥345Mpa

≥21%

Q235B

375-500Mpa

≥235Mpa

≥26%

Q345 and Q235 steel plate applications are quite different, shown as the following:

Q345 is low alloy structural steel with good mechanical properties, low temperature performance, plasticity and good weldability, it is mostly used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, mechanical parts, building structure, general metal parts, Q345 steel plate is always delivered in hot rolled or normalizing state, can be used in areas where its temperature is below 40 ℃.

Q235 carbon structural steel is made for metal construction that doesn’t have high demand for steel strength, tie rod, connecting rod, hook, coupler, bolt and nut, sleeve, shaft and welding parts.

In a word, Q345 steel plate and Q235 steel plate can be substituted with each other in some areas, but somes not. Welcome to share any new ideas or pending orders about Q345 and Q235 steel plate with us, we will reply you as soon as we get your reply.