標準編號:	CB/T 773-1998
中文名稱:	結構鋼鍛件技術條件
英文名稱:	Technical requirements for structure steel forging
中標分類:	U05    船舶用材料及其檢驗方法
行業分類:	CB    船舶行業標準
ICS分類:	47.020.05 47.020.05    造船用材料和零件 47.020.05
發布機構:	國防科學技術工業委員會
發布日期:	1998-3-20
實施日期:	1998-8-1
標準狀態:	superseded
被新標準替代:	CB/T 4494-2019 船用鍛鋼件
被替代日期:	2019-11-1
替代舊標準:	CB 773-1986
翻譯語言:	英文
文件格式:	PDF
中文字符數:	10000 字
翻譯價格(元):	1000.0
交付時間:	付款后 1 個工作日

Technical requirements for structure steel forging 1 Scope This standard specifies the requirements of structure steel forgings for ships (hereinafter referred to as “forgings”), test methods, inspection rules, marks and quality certificates. This standard is applicable to the manufacture and acceptance of carbon structural steel, carbon manganese structural steel, alloy structural steel, stainless acid-resistant steel, heat-resistant non-scaling steel and other forgings forged freely on marine hammers (including swage forgings). 2 Normative references The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions listed were valid. All normative references used are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the normative standards indicated below. GB 222-84 Method of sampling steel for determination of chemical composition and permissible variations for product analysis GB 223.5-88 Methods for chemical analysis of iron, steel and alloy - oxalic acid - Oxalic acid - ferrous sulfate silicon and molybdenum blue photometric method for the determination of silicon GB/T 223.12-91 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content GB 223.26-89 Methods for chemical analysis of iron, steel and alloy - The thiocyanate direct photometric method for the determination of molybdenum content GB 223.53-87 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content GB 223.54-87 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of nickel content GB 223.59-87 Methods for chemical analysis of iron, steel and alloy- The reduced molybdoantimonyl phosphoric acid photometric method for the determination of phosphorus content GB 223.63-88 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content GB 223.68-89 Methods for chemical analysis of iron, steel and alloy - The combustion potassium iodate volumetric method for the determination of sulfur content GB 223.69-89 Methods for chemical analysis of iron, steel and alloy - The gas- volumetric method after combustion for the determination of carbon content GB 228-87 Metallic materials - Tensile testing GB/T 229-1994 Metallic Materials - Charpy Notch Impact Test GB 231-84 Metallic materials - Brinell hardness test GB 699-88 Quality carbon structure steel - Technical requirements GB 1220-92 Stainless steel bars GB 1221-92 Heat-resisting steel bars GB 3077-88 Alloy structure steel - Technical requirements 3 Requirements 3.1 Manufacture 3.1.1 Steel for forging shall be made of killed steel. 3.1.2 Steel ingots and rolled products used in forging shall have smelting furnace numbers and qualified chemical composition. The purchased billet shall also be accompanied by a certificate of mechanical properties. Other relevant billet acceptance requirements beyond those specified in this standard shall be negotiated by the supplier and the purchaser. 3.1.3 Ingots or billets shall have no slag inclusion, gas hole, scab, crack, fold, overburning and other defects before forging. All defects shall be cleaned before forging, and inspected for qualification by the inspection department before putting into use. 3.1.4 The ingot casting head and bottom shall be cut off. 3.1.5 The forging process shall be determined by the supplier. 3.2 Chemical composition 3.2.1 The chemical composition of forgings for hull structures shall be in accordance with those specified in Table 1.

Foreword i 1 Scope 2 Normative references 3 Requirements 4 Test methods 5 Inspection rules 6 Marking and quality certificate Annex A (Normative) Strength grade of carbon steel and carbon manganese steel forgings Annex B (Normative) Strength grade of alloy steel forgings

1 范圍 本標準規定了船用結構鋼鍛件(以下簡稱鍛件)的要求，試驗方法、檢驗規則、標志和質量合格證書。 本標準適用于船用錘上自由鍛造(包括胎膜鍛造)的碳素結構鋼、碳錳結構鋼、合金結構鋼、不銹耐酸鋼、耐熱不起皮鋼等鍛件的制造和驗收。 2 引用標準 下列標準所包含的條文，通過在本標準中引用而構成為本標準的條文。本標準出版時，所示版本均為有效。所用標準都會被修訂，使用本標準的各方應探討使用下列標準最新版本的可能性。 GB 222—84 鋼的化學分析用試樣取樣法及成品化學成分允許偏差 GB 223.5—88 鋼鐵及合金化學分析方法 草酸—硫酸亞鐵硅鉬藍光度法測定硅量 GB/T 223.12—91 鋼鐵及合金化學分析方法 碳酸鈉分離—二苯碳酰二肼光度法測定鉻量 GB 223.26—89 鋼鐵及合金化學分析方法 硫氰酸鹽直接光度法測定鉬量 GB 223.53—87 鋼鐵及合金化學分析方法 火焰原子吸收分光光度法測定銅量 GB 223.54—87 鋼鐵及合金化學分析方法 火焰原子吸收分光光度法測定鎳量 GB 223.59—87 鋼鐵及合金化學分析方法 銻磷鉬藍光度法測定磷量 GB 223.63—87 鋼鐵及合金化學分析方法 高碘酸鈉(鉀)光度法測定錳量 GB 223.68—87 鋼鐵及合金化學分析方法 燃燒—碘酸鉀容量法測定硫量 GB 223.69—87 鋼鐵及合金化學分析方法 燃燒氣體容量法測定碳量 GB 228—87 金屬拉伸試驗方法 GB/T 229—1994 金屬夏比缺口沖擊試驗方法 GB 231—84 金屬布氏硬度試驗方法 GB 699—88 優質碳素結構鋼技術條件 GB 1220—92 不銹鋼棒 GB 1221—92 耐熱鋼棒 GB 3077—88 合金結構鋼技術條件 3 要求 3.1 制造 3.1.1 鍛件用鋼應采用鎮靜鋼鍛制。 3.1.2 鍛造使用的鋼錠及軋材應有熔煉爐號和合格的化學成分。若鋼坯為外購，則還應附有力學性能合格證書。對超出本標準規定的其他有關鋼坯驗收要求，由供需雙方議定。 3.1.3 鋼錠或鋼坯鍛造前不應有夾渣、氣孔、結疤、裂紋、折疊、過燒等缺陷。所有缺陷均應在鍛造前清除干凈，并經檢查部門檢查合格后，方可投入使用。 3.1.4 鋼錠澆冒口及底部應予切除。 3.1.5 鍛造工藝由供方決定。 3.2 化學成分 3.2.1 船體結構用鍛件的化學成分應符合表1的規定。 表1 船體結構用鍛件的化學成分 ％ 化學元素含量 構件連接方式 殘余元素 焊接 非焊接 總含量 3.2.1.1 焊接件的化學成分應符合下述規定： a)從鍛件取樣的含碳量應不大于0.26％； b)焊后不進行熱處理時，其含錳量應不小于實際含碳量的三倍； c)所用鋼材的殘余元素中，銅含量應不大于0.25％。 3.2.1.2 如果要求鍛件作含氮量分析，應在圖樣中規定。 3.2.2 船舶機械用鍛件的化學成分應符合表2的規定。 表2 機械用鍛件的化學成分 化學元素含量 鋼種 殘余元素 碳鋼和碳錳鋼 合金鋼 3.2.2.1 對焊接組裝的鍛件，所用鋼材的含碳量應不大于0.23％，殘余元素總含量應不大于0.80％。 3.2.2.2 碳素結構鋼牌號按GB 699選用。 3.2.2.3 合金結構鋼牌號按GB 3077選用。 3.2.2.4 不銹耐酸、耐熱鋼牌號應分別按GB 1220、GB 1221選用。 3.3 力學性能 3.3.1 船體結構用鍛件的力學性能應符合表3的規定。 表3 船體結構鋼鍛件的力學性能 屈服點σ5 不小于 MPa 抗拉強度σ? 不小于 MPa 伸長率δ5 不小于 ％ 縱向 切向 橫向 215 430 24 21 18 3.3.2 船舶機械用碳鋼和碳錳鋼鍛件的力學性能應符合表4的規定。 表4 船舶機械用碳鋼和碳錳鋼鍛鋼件力學性能 抗拉強度σb不小于MPa 屈服點σ5不小于MPa 伸長率δ5不小于％ 斷面收縮率Ψ不小于％ 夏比V型缺口沖擊吸收功AkV不小于J 硬度HB(參考) 縱向 切向 橫向