目录简介 | Foreword 1 Scope 2 Normative references 3 Denotation of the grade and symbols 3.1 Denotation of the grade 3.2 Symbols 4 Dimension, shape, weight and permissible deviation 5 Technical requirements 5.1 Grade and chemical composition 5.2 Smelting method 5.3 Delivery state 5.4 Mechanical property 6 Test methods 7 Inspection rules 8 Packing, marking and quality certificate Annex A (Normative) Impact absorbed energy of small-sized impact sample |