... SS400/SS540 hot rolled mild steel JIS standard U Channels Mild steel U channel, U steel, Hot rolled U channelMaterial: SS400, ST37-2, A36 ... , S235JR, Q235, Q345 etc. Standard: GB/JIS/ ... .SGS inspection report2.Channel Steel, U channel, Channel for shipment3.Loading pic4.Contact person GB standard U shape channel steel Q235B