Date:2012-05-02 16:34
steel commonly used standard terminology serial number Name Description 1 standards standard Uniform provisions made for repetitive things and concepts. The integrated results of the scientific, technical and practical experience by the concerned parties unanimously approved by the competent authority, released a specific form, as to comply with the criteria and basis. At present, Chinas iron and steel products to the implementation of the standards are national standards (GB, GB / T),