標(biāo)準(zhǔn)編號:	GB/T 20564.4-2022
中文名稱:	汽車用高強度冷連軋鋼板及鋼帶 第4部分：低合金高強度鋼
英文名稱:	Continuously cold rolled high strength steel sheet and strip for automobile—Part 4：High strength low alloy steel
中標(biāo)分類:	H46    鋼板、鋼帶
行業(yè)分類:	GB    國家標(biāo)準(zhǔn)
ICS分類:	77.140.50 77.140.50    扁平鋼和半成品 77.140.50
發(fā)布機構(gòu):	國家市場監(jiān)督管理總局 國家標(biāo)準(zhǔn)化管理委員會
發(fā)布日期:	2022-07-11
實施日期:	2023-2-1
標(biāo)準(zhǔn)狀態(tài):	valid
替代舊標(biāo)準(zhǔn):	GB/T 20564.4-2010 汽車用高強度冷連軋鋼板及鋼帶 第4部分：低合金高強度鋼
翻譯語言:	英文
文件格式:	PDF
中文字符數(shù):	15000 字
翻譯價格(元):	950.0
交付時間:	付款后 1 個工作日

Continuously cold rolled high strength steel sheet and strip for automobile – Part 4: High strength low alloy steel 1 Scope This document specifies the classification and designation expression, order content, dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of continuously cold rolled high strength low alloy steel sheet and strip for automobile. This document is applicable to continuously cold rolled high strength low alloy steel sheet and strip with thickness of 3.0 mm or below, which are mainly used for making structural parts and stiffeners of automobile (hereinafter referred to as "sheet and strip"). 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method GB/T 223.9 Iron, steel and alloy - Determination of aluminum content - Chrome azurol S photometric method GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content GB/T 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - Curcumin spectrophotometric method for the determination of boron content GB/T 223.84 Steel and alloy - Determination of titanium content - Diantipyrylmethane spectrophotometric method GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 247 General rule of package, mark and certification for steel plates (sheets) and strips GB/T 708 Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet GB/T 2523 Measuring method of surface roughness and peak count for cold-rolled metal sheet (strip) GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (n-values) GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 17505 Steel and steel products - General technical delivery requirements GB/T 18253-2018 Steel and steel products - Types of inspection documents GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an induction furnace (with preheating) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 high strength low alloy steel; LA low carbon steel with higher strength by refining grains of microalloying elements and adding such single or composite microalloying elements as niobium, titanium and vanadium to precipitate the carbohydrates and nitrogenous compounds particles 4 Designation expression and classification 4.1 Designation expression The designation of steel sheet and strip consists of three parts: the initial capital letters of "Cold Rolled", i.e., "CR", the specified minimum yield strength and the initial capital letters of "Low Alloy", i.e., "LA". For example: CR260LA, where: CR——the initial capital letters of "Cold Rolled"; 260——the specified minimum yield strength, in MPa; LA——the initial capital letter of "Low Alloy". 4.2 Classification 4.2.1 The designation and recommended application of steel sheet and strip are shown in Table 1.

Foreword i Introduction iii 1 Scope 2 Normative references 3 Terms and definitions 4 Designation expression and classification 5 Order contents 6 Dimension, shape and weight 7 Technical requirements 8 Test methods 9 Inspection rules 10 Packaging, marking and quality certificate 11 Comparison of designations in this part and those in foreign standards Annex A (Informative) Reference values for chemical composition (melting analysis) of steels Annex B (Normative) Mechanical properties of steel sheet and strip (the sample is in longitudinal direction) Annex C (Informative) Comparison of designations in this document and those in foreign standards Bibliography

1范圍 本文件規(guī)定了汽車用冷連軋低合金高強度鋼板及鋼帶的分類和牌號表示方法、訂貨內(nèi)容、尺寸外形、重量.技術(shù)要求,試驗方法,檢驗規(guī)則、包裝,標(biāo)志和質(zhì)量證明書等。 本文件適用于厚度不大于3.0 mm,主要用于制作汽車結(jié)構(gòu)件和加強件的冷連軋低合金高強度鋼板及鋼帶(以下簡稱“鋼板及鋼帶”)。 2規(guī)范性引用文件 下列文件中的內(nèi)容通過文中的規(guī)范性引用而構(gòu)成本文件必不可少的條款。其中,注日期的引用文件,僅該日期對應(yīng)的版本適用于本文件;不注日期的引用文件,其最新版本(包括所有的修改單)適用于本文件。 GB/T 223.5鋼鐵酸溶硅和全硅含量的測定還原型硅鉬酸鹽分光光度法 GB/T 223.9鋼鐵及合金鋁含量的測定鉻天青S分光光度法 GB/T 223.40鋼鐵及合金崔含量的測定氦磺酚S分光光度法 GB/T 223.59鋼鐵及合金磷含量的測定銼磷鉬藍分光光度法和銻磷鉬藍分光光度法 GB/T 223.63鋼鐵及合金化學(xué)分析方法高碘酸鈉(鉀)光度法測定錳量 GB/T 223.64鋼鐵及合金錳含量的測定火焰原子吸收光譜法 GB/T 223.76鋼鐵及合金化學(xué)分析方法﹑火焰原子吸收光譜法測定釩量 GB/T 223.78 鋼鐵及合金化學(xué)分析方法―姜黃素直接光度法測定硼含量 GB/T 223.84鋼鐵及合金鈦含量的測定二安替比林甲烷分光光度法 GB/T 223.85鋼鐵及合金硫含量的測定﹑感應(yīng)爐燃燒后紅外吸收法 3術(shù)語和定義 下列術(shù)語和定義適用于本文件。 3.1 低合金高強度鋼high strength low alloy steel: LA 在低碳鋼中,通過單一或復(fù)合添加崔,鈦﹑釩等微合金元素,形成碳氮化合物粒子析出進行強化,同時通過微合金元素的細化晶粒作用,以獲得較高的強度。 4牌號表示方法和分類 4.1牌號表示方法 鋼板及鋼帶的牌號由冷軋的英文“Cold Rolled”的首字母“CR”,規(guī)定的最小屈服強度值、低合金的英文“Low Alloy”的首字母“LA”三個部分組成。 示例:CR2601A,其中: CR—冷軋的英文“Cold Rolled"的首字母, 260—規(guī)定的最小屈服強度值,單位為兆帕(MPa), LA—低合金的英文“Low Alloy”的首字母。4.2分類 4.2.1鋼板及鋼帶牌號與推薦用途見表1。 4.2.2鋼板及鋼帶按表面質(zhì)量級別分類見表2。 4.2.3鋼板及鋼帶按表面結(jié)構(gòu)分類見表3。 5訂貨內(nèi)容 5.1按本文件訂貨的合同或訂單應(yīng)包括下列內(nèi)容: a)產(chǎn)品名稱(鋼板或鋼帶>; b)本文件編號; c)牌號; d)規(guī)格及尺寸、不平度精度﹔e)表面質(zhì)量級別; f表面結(jié)構(gòu); g)邊緣狀態(tài);h)包裝方式;i重量;j)用途﹔ k)其他特殊要求。 5.2如訂貨合同中未注明尺寸和不平度精度、表面質(zhì)量級別、表面結(jié)構(gòu)種類,邊緣狀態(tài)及包裝等信息，則本文件產(chǎn)品按普通的尺寸和不平度精度、較高級表面,表面結(jié)構(gòu)為麻面的切邊鋼板或鋼帶供貨,并按供方提供的包裝方式包裝。 6尺寸、外形、重量 鋼板及鋼帶的尺寸,外形、重量及允許偏差應(yīng)符合GB/T 708的規(guī)定。 7技術(shù)要求 7.1化學(xué)成分 鋼的化學(xué)成分(熔煉分析)參考值見附錄A。如需方對化學(xué)成分有要求,應(yīng)在訂貨時協(xié)商。 7.2冶煉方法 鋼板及鋼帶所用的鋼采用氧氣轉(zhuǎn)爐或電爐冶煉,除非另有規(guī)定,冶煉方式由供方選擇。 7.3交貨狀態(tài) 7.3.1 鋼板及鋼帶以退火后平整狀態(tài)交貨。 7.3.2鋼板及鋼帶通常涂油供貨,所涂油膜應(yīng)能用堿水溶液或通常的溶劑去除﹔在通常的包裝、運輸、裝卸及貯存條件下,供方保證自制造完成之日起6個月內(nèi),鋼板及鋼帶表面不生銹。如需方要求不涂油供貨,應(yīng)在訂貨時協(xié)商。 注:對于需方要求的不涂油產(chǎn)品,可能產(chǎn)生銹蝕,同時在運輸﹑裝卸,儲存和使用過程中,表面易產(chǎn)生輕微劃傷。 7.4力學(xué)性能 供方保證自制造完成之日起6個月內(nèi),鋼板及鋼帶的橫向力學(xué)性能應(yīng)符合表4的規(guī)定。如需方要求縱向力學(xué)性能,經(jīng)供需雙方協(xié)商,并在合同中注明,供方保證自制造完成之日起6個月內(nèi),縱向力學(xué)性能應(yīng)符合附錄B的規(guī)定,此時表4規(guī)定不再適用。 注:由于時效的影響,鋼板及鋼帶的力學(xué)性能會隨著儲存時間的延長而變差,如屈服強度和抗拉強度的上升,斷后伸長率的下降,成形性能變差,出現(xiàn)拉伸應(yīng)變痕等,建設(shè)用戶盡早使用。 7.5表面質(zhì)量 7.5.1鋼板及鋼帶表面不應(yīng)有結(jié)疤,裂紋,夾雜等對使用有害的缺陷,鋼板及鋼帶不應(yīng)有目視可見分層。 7.5.2鋼板及鋼帶各表面質(zhì)量級別的特征參見表5。 7.5.3對于鋼帶,由于沒有機會切除帶缺陷部分,因此允許帶缺陷交貨,但有缺陷部分應(yīng)不超過每卷總長度的6%。 8試驗方法 8.1妳鋼的化學(xué)成分試驗一般按GB/T 4336,GB/T 20123,GB/T 20125,GB/T 20126或通用的化學(xué)分析方法進行,仲裁時應(yīng)按GB/T 223.5、GB/T 223.9、GB/T 223.40、GB/T 223,59、GB/T 223.63,GB/T 223.64,GB/T 223.76,GB/T 223.78,GB/T 223.84,GB/T 223.85和GB/T 223.86的規(guī)定進行。8.2鋼板及鋼帶的檢驗項目和試驗方法應(yīng)符合表7的規(guī)定。 8.3 n值是在10%~20%塑性應(yīng)變范圍內(nèi)計算得到的。當(dāng)最大力塑性延伸率小于20%但不小于12%時,計算的塑性應(yīng)變范圍為10%至最大力塑性延伸率結(jié)束;當(dāng)最大力塑性延伸率小于12%時,拉伸應(yīng)變硬化指數(shù)應(yīng)按照最大力塑性延伸率結(jié)束點計算的真實塑性應(yīng)變值報告。 9檢驗規(guī)則 9.1鋼板及鋼帶的檢查和驗收由供方檢驗部門進行。 9.2鋼板及鋼帶應(yīng)按批驗收,每個檢驗批應(yīng)由同牌號,同規(guī)格,同加工狀態(tài)的鋼板或鋼帶組成。每批的重量應(yīng)不大于30 t,對于卷重大于 30 t的鋼帶,每卷作為一個檢驗批。 9.3鋼板及鋼帶的取樣數(shù)量和取樣方法應(yīng)符合表7的規(guī)定。 9.4鋼板及鋼帶的復(fù)驗與判定規(guī)則應(yīng)符合GB/T 17505的規(guī)定。 9.5化學(xué)成分和力學(xué)性能的檢測結(jié)果按修約值比較法進行修約,修約規(guī)則按GB/T 8170的規(guī)定。 10包裝、標(biāo)志及質(zhì)量證明書 鋼板及鋼帶的包裝,標(biāo)志及質(zhì)量證明書應(yīng)符合GB/T 247的規(guī)定。質(zhì)量證明書(檢驗文件)的類型應(yīng)符合GB/T 18253—2018中規(guī)定。當(dāng)未指定檢驗文件類型時按GB/T 18253—2018類型3.1。如需方對包裝有特殊要求,可在訂貨時協(xié)商。 11國內(nèi)外牌號近似對照 本文件牌號與國外標(biāo)準(zhǔn)牌號的近似對照見附錄C。