Q345B structural steel plates surface quality should be consistent with the provisions

Q345B structural steel plates are well known by more and more foreign clients and widely used in all kinds of structure construction nowadays. It is becoming popular as equivalent structural steel ASTM A572Gr.50, ST52-3 steel, SM490 etc materials.

Q345B low alloy structural hot rolled steel plates surface quality should be consistent with the provisions. For example:

1. Q345B low alloy structural hot rolled steel plates surface is not allowed to have bubbles, scarring, cracking, iron oxide scale. Q345B structural steel plates can not be stratified.

2. The surface of Q345B structural steel plates is allowed to have a thin layer of scale that does not hinder the inspection of surface defects, rust, insignificant roughness caused by the peeling-off of the scale iron scale, scratches, webs caused by rolls, and other local defects. However, the concavity shall not exceed the minimum allowable thickness of Q345B low alloy structural steel.

3. Defects on Q345B structural steel plates surface do not allow welding and clogging, and should use chisels or wheel cleaning. The clean-up should be gentle and angular, the depth of clean-up shall not exceed the minimum allowable thickness of Q345B low alloy structural hot rolled steel plates.

4. Trimming edge of Q345B structural steel plates shall not have serrated bump, but allows certain hair lines with less than 2mm depth and 25mm length. For mill edge Q345B low alloy structural hot rolled steel plates, for the edge cracks and other defects due to rolling, the transverse depth should be not more than half of the width of the deviation, and Q345B width should be smaller than the nominal width.

Q345B structural steel plates surface quality should be consistent with above provisions. If the purchased Q345B structural steel plates is not in line with the provisions, the client has the right to ask pay back.