低合金中板8Q345B鞍钢3920-货少低合金中板16-20Q345B鞍钢3660-货少低合金中板14-25Q345B营口3660-货少普中板8Q235B鞍钢3740-货少普中板16-20Q235B鞍钢3490-货少普中板16-20Q235B天钢3480-货少普中板14-25Q235B营口3480-货少