標(biāo)準(zhǔn)編號:	GB/T 5310-2017/XG1-2019
中文名稱:	高壓鍋爐用無縫鋼管，含國家標(biāo)準(zhǔn)第1號修改單
英文名稱:	Seamless steel tubes and pipes for high pressure boiler, includes Amendment 1
中標(biāo)分類:	H48    鋼管、鑄鐵管
行業(yè)分類:	GB    國家標(biāo)準(zhǔn)
ICS分類:	77.140.75 77.140.75    特殊用管鋼 77.140.75
發(fā)布機(jī)構(gòu):	中華人民共和國國家質(zhì)量監(jiān)督檢驗(yàn)檢疫總局 中國國家標(biāo)準(zhǔn)化管理委員會
發(fā)布日期:	2017-12-29
實(shí)施日期:	2020-3-1
標(biāo)準(zhǔn)狀態(tài):	valid
替代舊標(biāo)準(zhǔn):	GB/T 5310-2017 高壓鍋爐用無縫鋼管
翻譯語言:	英文
文件格式:	PDF
中文字符數(shù):	25000 字
翻譯價格(元):	1750.0
交付時間:	付款后 1 個工作日

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 5310-2008 Seamless Steel Pipe for High Pressure Boiler, the following main technical changes have been made with respect to GB/T 5310-2008: ——The grade of steel is added; ——The smelting method of stainless steel is modified; ——Total elongation coefficient requirement is added; ——The heat treatment system of 15CrMoG steel pipe is modified; ——Hardness requirements are modified; ——Requirements for surface hardness are added; ——Requirements for flattening and bending tests are modified; ——The grain size requirement is modified; ——The microstructure requirements are modified; ——Depth requirements for decarburization layer are modified; ——Surface quality requirements are modified; ——Specified plastic elongation strength under high temperature of 10Cr9MoW2VNbBN and 07Cr25Ni21NbN are modified; ——Recommended data about endurance strength of 10Cr9MoW2VNbBN, 07Cr25Ni21NbN and 08Cr18Ni11NbFG are modified. This standard was proposed by China Iron and Steel Industry Association. This standard is under the jurisdiction of the National Technical Committee on Steel of Standardization Administration of China (SAC/ TC 183). The previous versions of the standards replaced by this standard are as follows: ——GB 5310-1985, GB 5310-1995 and GB/T 5310-2008 Contents 1 Scope 2 2 Normative References 2 3 Classification Code 5 4 Order 5 5 Dimension, Shape, Weight and Deviation 6 6 Technical Requirements 10 7 Sample 31 8 Inspection and Test Method 32 9 Inspection Rules 34 10 Packaging, Marking and Quality Certificate 35 Annex A (Normative) Specified Plastic Elongation Strength at High Temperature 36 Annex B (Informative) Recommended Data on 100,000h Endurance Strength / MPa 38 Amendment No. 1 for National Standard GB/T 5310-2017 Seamless steel tubes and pipes for high pressure boiler In the original standard: Concerning the mechanical properties of steel tubes in Table 7, clause 6.4.1, for steel tubes with designation of 15CrMoG in the row of No.7, the required Brinell hardness is 125HBW~170HBW and the required Vickers hardness is 125HV~170HV; and for steel tubes with designation of 07Cr25Ni21NbN in the row of No.21, the required Brinell hardness is 175HBW~256 HBW and the required Vickers hardness is 85HRB~100HRB. Modifications: Concerning the mechanical properties of steel tubes in Table 7, clause 6.4.1, for steel tubes with designation of 15CrMoG in the row of No.7, the required Brinell hardness is 125HBW~195HBW and the required Vickers hardness is 125HV~195HV; and for steel tubes with designation of 07Cr25Ni21NbN in the row of No.21, the required Brinell hardness is 150HBW~256 HBW and the required Vickers hardness is 80HRB~100HRB. ? Seamless Steel Tubes and Pipes for High Pressure Boilers 1 Scope This standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, inspection rules as well as packaging, marking and quality certificate. This standard is applicable to seamless tubes for manufacturing high-pressure steam boiler or above and seamless tubes used as pipelines. 2 Normative References The following referenced documents are indispensable for the application 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 222 Allowable Deviation of Chemical Composition of Finished Products 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 Aluminium Content - Chrom Azurol Sphotometric Method GH/T 223.11 Determination of Chromium Content in Steel and Alloys - Visual Titration or Potentiometric Titration GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium Content GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy The Chromotropic Acid Photometric Method for The Determination Of Titanium Content GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content GB/T 223.23 Iron Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content GB/T 223.26 Iron Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method GB/T 223.29 Iron Steel And Alloy - Determination of Lead Content - Carrier Precipitation-Xylenol Orange Spectrophotometric Method GB/T 223.30 Methods for Chemical Analysis of Iron, Steel and Alloy - The Arsenazo III Spectrophotometric Method for the Determination of Zirconium Content after Separation by P-Bromomandelic Acid GB/T 223.31 Iron Steel and Alloy - Determination of Arsenic Content - Distillation-molybdenum Blue Spectrophotometric Method GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neutral Titration Method for the Determination of Nitrogen Content After Distillation Separation GB/T 223.38 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion-Exchange Separation-Gravimetric Method for the Determination of Niobium Content GB/T 223.40 Iron Steel and Alloy - Detetmination of Niobium Content by the Sulphochlorophenol Spectrophotometric Method GB/T 223.43 Iron Steel and Alloy - Determination of Tungsten Content - Gravimetryc Method and Spectrophotometric Method GB/T 223.47 Methods for Chemical Analysis of Iron, Steel and Alloy - The Carrier Precipitation-Molybdenum Blue Potometric Method for the Determination of Antimony Content GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy The phenylfuorone-CTMAB Direct Photometric Method for the Determination of Tin Content GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium Arsenite-Sodium Nitrite Titrimetric Method for the Determination of Manganese Content 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 223.67 Iron Steel and Alloy - Determination of Sulfur Content -Methylene Blue Spectrophotometric Method GB/T 223.69 Iron Steel and Alloy - Determination of Carbon Contents - Gas-volumetric Method after Combustion in the Pipe Furnace GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin Spectrophotometric Method for the Determination of Boron content GB/T 223.80 Iron Steel and Alloy - Determination of Trace Bismuth and Arsenic Contents - Hydride Generation-atomic Fluorescence Spectrometric Method GB/T 224 Determination of Depth of Decarburization of Steels GB/T 226 Low-power Microstructure and Defect Etching Test of Steel GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature GB/T 228.2 Metallic Materials - Tensile testing - Part 2: Method of Test at Elevated Temperature GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (scales A, B, C, D, E, F, G, H, K, N and T) GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method GB/T 232 Metallic Materials - Bend Test GB/T 241 Metal Materials - Tube - Hydrostatic Pressure Test GB/T 242 Metal Materials - Tube - Drift-expending Test GB/T 246 Metal Materials - Tube - Flattening Test GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels GB/T 2102 Acceptance Packing Marking and Quality Certification of Steel Pipe GB/T 2975 Steel and Steel Products - Location and Preparation of 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 4340.1 Metallic Materials - Vickers Hardness Test - Part 1:Test Method GB/T 5777-2008 Seamless Steel Pipe and Tubing Methods for Ultrasonic Testing GB/T 6394-2017 Determination of Estimating the Average Grain Size of Metal GB/T 7735-2016 Automated Eddy Current Testing of Seamless and Welded(except Submerged Arc-welded) Steel Tubes for Detection of Imperfections GB/T 10561-2005 Steel Determination of Content of Nonmetallic Inclusions Micrographic Method Using Standards Diagrams GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 12606-2016 Automated Full Peripheral Flux Leakage Testing of Seamless and Welded(except Submerged Arc-Welded) Ferromagnetic Steel Tubes for the Detection of Longitudinal and/or Transverse Imperfections GB/T 1329S Inspection Methods of Microstructure for Metals GB/T 15822 Non-destructive Testing - Magnetic Particle Testing GB/T 17395 Dimensions Shapes Masses and Tolerances of Seamless Steel Tubes 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 20124 Steel and Iron - Determination of Nitrogen Content - Thermal conductimetric Method after Fusion in a Current of Inert Gas GB/T 31925-2015 Ultrasonic Test Methods of Heavy Wall Thickness Seamless Steel Pipes and Tubes NB/T 47013.5 Nondestructive Testing of Pressure-Bearing Equipment - Part 5: Penetrant Testing YB/T 4149 Continuously Cast Round Billet for Seamless Steel tube and pipe Rolling YB/T 5137 Classification and Designation of Round Tube Blank 3 for Hot Rolling and Forging Seamless Steel Tubes for High Pressure Application 3 Classification Code 3.1 Seamless steel pipe of this standard is divided into two classes according to the product manufacturing method; its class and code are as follows: a) Hot rolled (extruded, expanded) steel tubes, with code name of W-H ; b) Cold drawn (rolled) steel pipe., with code name of W-C. 3.2 For the purpose of this document, the following codes apply. D——the outside Diameter, (including the outside diameter in mm, unless otherwise stated) S——the wall thickness (including the nominal wall thickness and the average wall thickness in mm, unless otherwise stated) Smin——the minimum wall thickness d——the nominal inside diameter Dc——the calculated outside diameter (outside diameter value in millimeters calculated by the sum of nominal inside diameter and nominal wall thickness) Sc——the average wall thickness (the average of the maximum and minimum wall thicknesses, in millimeters, calculated by the minimum wall thickness and its allowable deviation) 4 Order Contracts or orders for steel pipes ordered in accordance with this standard shall include, but not be limited to the followings: a) Product name; b) Standard number; c) Grade of steel; d) Quantity ordered (total weight or total length); e) Dimension and specification; f) Special requirements 5 Dimension, Shape, Weight and Deviation 5.1 Outside diameter and wall thickness 5.1.1 Unless otherwise specified in the contract, the steel tubes are delivered by outside diameter and wall thickness. Upon request by the purchaser and after negotiation between the purchaser and the supplier, the steel tubes may be delivered by nominal outside diameter and minimum wall thickness, nominal inside diameter and nominal wall thickness or other dimensions and specifications. 5.1.2 Outside diameter and wall thickness of steel tubes shall be in accordance with those specified in GB/T 17395. Upon the request by the purchaser and after negotiation between the purchaser and the supplier, the steel tubes with dimensions beyond those specified in GB/T 17395 can be supplied. If delivered by nominal inside diameter and nominal wall thickness, the dimension and specification shall be agreed by both sides. 5.1.3 If delivered by nominal outside diameter and nominal wall thickness, the permissible deviations shall be in accordance with those specified in Table 1. 5.1.4 If delivered by nominal outside diameter and minimum wall thickness, the permissible deviations of outside diameter shall be in accordance with those specified in Table 1, and the permissible deviations of wall thickness shall be in accordance with those specified in Table 2. 5.1.5 If delivered by nominal inside diameter and nominal wall thickness, the permissible deviations of nominal inside diameter shall be ±1%d, and that of nominal wall thickness shall be in accordance with those specified in Table 1. 5.1.6 If the purchaser doesn’t indicate the permissible deviations of steel tubes in the contract, the permissible deviations of outside diameter and wall thickness shall meet the requirements for normal grades. Upon request by the purchaser, after the negotiation between the purchaser and the supplier and in accordance with those stated in the contract, the steel tubes with permissible deviations of dimensions other than those specified in Table 1 and Table 2 can be supplied.

1 Scope 2 Normative References 3 Classification Code 4 Order 5 Dimension, Shape, Weight and Deviation 6 Technical Requirements 7 Sample 8 Inspection and Test Method 9 Inspection Rules 10 Packaging, Marking and Quality Certificate Annex A (Normative) Specified Plastic Elongation Strength at High Temperature Annex B (Informative) Recommended Data on 100,000h Endurance Strength / MPa

高壓鍋爐用無縫鋼管 1范圍 本標(biāo)準(zhǔn)規(guī)定了高壓鍋爐用無縫鋼管的分類、代號、尺寸、外形、重量、技術(shù)要求、試樣、試驗(yàn)方法、檢驗(yàn) 規(guī)則、包裝、標(biāo)志和質(zhì)量證明書。 本標(biāo)準(zhǔn)適用于制造高壓及其以上壓力的蒸汽鍋爐、管道用無縫鋼管。 2規(guī)范性引用文件 下列文件對于本文件的應(yīng)用是必不可少的。凡是注日期的引用文件，僅注日期的版本適用于本文本。凡是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 222鋼的成品化學(xué)成分允許偏差 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 GH/T 223.11鋼鐵及合金 鉻含量的測定 可視滴定或電位滴定法 GB/T 223.14鋼鐵及合金化學(xué)分析方法 鉭試劑萃取光度法測定釩含量 GB/T 223.16鋼鐵及合金化學(xué)分析方法 變色酸光度法測定鈦量 GB/T 223.18鋼鐵及合金化學(xué)分析方法 硫代硫酸鈉分離-碘量法測定銅量 GB/T 223.23鋼鐵及合金鎳含量的測定 丁二酮肟分光光度法 GB/T 223.25鋼鐵及合金化學(xué)分析方法 丁二酮肟重量法測定鎳量 GB/T 223.26鋼鐵及合金 鉬含量的測定 硫氰酸鹽分光光度法 GB/T 223.29鋼鐵及合金 鉛含量的測定 載體沉淀-二甲酚橙分光光度法 GB/T 223.30鋼鐵及合金化學(xué)分析方法 對-溴苦杏仁酸沉淀分離-偶氮胂Ⅲ分光光度法測定鋯量 GB/T 223.31鋼鐵及合金 砷含量的測定 蒸餾分離-鉬藍(lán)分光光度法 GB/T 223.36鋼鐵及合金化學(xué)分析方法 蒸餾分離-中和滴定法測定氮量 GB/T 223.38鋼鐵及合金化學(xué)分析方法 離子交換分離-重量法測定鈮量 GB/T 223.40鋼鐵及合金 鈮含量的測定 氯磺酚S分光光度法 GB/T 223.43鋼鐵及合金 鎢含量的測定 重量法和分光光度法 GB/T 223.47鋼鐵及合金化學(xué)分析方法 載體沉淀-鉬藍(lán)光度法測定銻量 GB/T 223.50鋼鐵及合金化學(xué)分析方法 苯基熒光酮-溴化十六烷基三甲基胺直接光度法測定錫量 GB/T 223.58鋼鐵及合金化學(xué)分析方法 亞砷酸鈉-亞硝酸鈉滴定法測定錳量 GB/T 223.59鋼鐵及合金 磷含量的測定 鉍磷鉬藍(lán)分光光度法和銻磷鉬藍(lán)分光光度法 GB/T 223.67鋼鐵及合金 硫含量的測定 次甲基藍(lán)分光光度法 GB/T 223.69鋼鐵及合金 碳含量的測定 管式爐內(nèi)燃燒后氣體容量法 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 223.80鋼鐵及合金 鉍和砷含量的測定 氫化物發(fā)生-原子熒光光譜法 GB/T 224鋼的脫碳層深度測定法 GB/T 226鋼的低倍組織及缺陷酸蝕檢驗(yàn)法 ? GB/T 228.1金屬材料 拉伸試驗(yàn) 第1部分:室溫試驗(yàn)方法 GB/T 228.2金屬材料 拉伸試驗(yàn) 第2部分:高溫試驗(yàn)方法 GB/T 229金屬材料 夏比擺錘沖擊試驗(yàn)方法 GB/T 230.1金屬材料 洛氏硬度試驗(yàn) 第1部分:試驗(yàn)方法(A、B、C、D、E、F、G、H、K、N、T標(biāo)尺) GB/T 231.1金屬材料 布氏硬度試驗(yàn) 第1部分:試驗(yàn)方法 GB/T 232金屬材料 彎曲試驗(yàn)方法 GB/T 241金屬管 液壓試驗(yàn)方法 GB/T 242金屬管 擴(kuò)口試驗(yàn)方法 GB/T 246金屬管 壓扁試驗(yàn)方法 GB/T 1979結(jié)構(gòu)鋼低倍織織缺陷評級圖 GB/T 2102鋼管的驗(yàn)收、包裝、標(biāo)志和質(zhì)量證明書 GB/T 2975鋼及鋼產(chǎn)品 力學(xué)性能試驗(yàn)取樣位置及試樣制備 GB/T 4336碳素鋼和中低合金鋼 多元索含量的測定 火花放電原子發(fā)射光譜法（常規(guī)法） GB/T 4340.1金屬材料 維氏硬度試驗(yàn) 第1部分：試驗(yàn)方法 GB/T 5777—2008無縫鋼管超聲波探傷檢驗(yàn)方法 GB/T 6394—2017金屬平均晶粒度測定方法 GB/T 7735—2016無縫和焊接(埋弧焊除外)鋼管缺欠的自動渦流檢測 GB/T 10561—2005鋼中非金屬夾雜物含量的測定 標(biāo)準(zhǔn)評級圖顯微檢驗(yàn)法 GB/T 11170不銹鋼 多元素含量的測定 火花放電原子發(fā)射光譜法（常規(guī)法） GB/T 12606—2016無縫和焊接（埋弧焊除外）鐵磁性鋼管縱向和/或橫向缺欠的全圓周自動漏磁 檢測 GB/T 1329S金屬顯微組織檢驗(yàn)方法 GB/T 15822(所有部分） 無損檢測 磁粉檢測 GB/T 17395無縫鋼管尺寸、外形、重量及允許偏差 GB/T 20066鋼和鐵 化學(xué)成分測定用試樣的取樣和制樣方法 GB/T 20123鋼鐵 總碳硫含量的測定 高頻感應(yīng)爐燃燒后紅外吸收法（常規(guī)方法） GB/T 20124鋼鐵 氮含量的測定 惰性氣體熔融熱導(dǎo)法（常規(guī)方法） GB/T 31925—2015厚壁無縫鋼管超聲波檢驗(yàn)方法 NB/T 47013.5 承壓設(shè)備無損檢測 第5部分:滲透檢測 YB/T 4149 連鑄圓管坯 YB/T 5137高壓用熱軋和鍛制無縫鋼管圓管坯 3分類和代號 3.1本標(biāo)準(zhǔn)的無縫鋼管按產(chǎn)品制造方式分為兩類，其類別和代號如下： a) 熱軋(擠壓、擴(kuò)）鋼管，代號為W-H ； b) 冷拔（軋)鋼管，代號為 3.2下列代號適用于本文件。 D 外徑（如無特殊說明，包括公稱外徑和/或計算外徑，單位為毫米） S 壁厚（如無特殊說明，包括公稱壁厚和/或平均壁厚，單位為毫米） Smin 最小壁厚 d 公稱內(nèi)徑 Dc 計算外徑(按公稱內(nèi)徑與公稱壁厚之和計算出來的外徑值，單位為毫米） Sc 平均壁厚(按最小壁厚及其允許偏差計算的壁厚最大值與最小值的平均值，單位為毫米） ? 4訂貨內(nèi)容 按本標(biāo)準(zhǔn)訂購鋼管的合同或訂單應(yīng)包括但不限于下列內(nèi)容： a) 產(chǎn)品名稱； b) 標(biāo)準(zhǔn)編號； c) 鋼的牌號； d) 訂購的數(shù)量（總重量或總長度）； e) 尺寸規(guī)格； f) 特殊要求。 5尺寸、外形、重量及允許偏差 5.1外徑和壁厚 5.1.1除非合同中另有規(guī)定，鋼管按公稱外徑和公稱壁厚交貨。根據(jù)需方要求，經(jīng)供需雙方協(xié)商，鋼管可按公稱外徑和最小壁厚、公稱內(nèi)徑和公稱壁厚或其他尺寸規(guī)格方式交貨。 5.1.2鋼管的公稱外徑和壁厚應(yīng)符合GB/T 17395的規(guī)定。根據(jù)需方要求，經(jīng)供需雙方協(xié)商，可供應(yīng)GB/T 17395規(guī)定以外尺寸的鋼管。當(dāng)鋼管按公稱內(nèi)徑和公稱壁厚交貨時，其尺寸規(guī)格由供需雙方協(xié) 商確定。 5.1.3鋼管按公稱外徑和公稱壁厚交貨時，公稱外徑和公稱壁厚的允許偏差應(yīng)符合表1的規(guī)定。 5.1.4鋼管按公稱外徑和最小壁厚交貨時，公稱外徑的允許偏差應(yīng)符合表1的規(guī)定，壁厚的允許偏差應(yīng)符合表2的規(guī)定。 5.1.5鋼管按公稱內(nèi)徑和公稱壁厚交貨時，其公稱內(nèi)徑的允許偏差為±1%d，公稱壁厚的允許偏差應(yīng) 符合表1的規(guī)定。 5.1.6當(dāng)需方未在合同中注明鋼管尺寸允許偏差級別時，鋼管外徑和壁厚的允許偏差應(yīng)符合普通級的規(guī)定。根據(jù)需方要求，經(jīng)供需雙方協(xié)商，并在合同中注明，可供應(yīng)表1和表2規(guī)定以外尺寸允許偏差的鋼管，或其他內(nèi)徑允許偏差的鋼管 表1鋼管公稱外徑和公稱壁厚允許偏差 單位為毫米 分類代號 制造方式 鋼管尺寸 允許偏差 普通級 高級 W-H 熱軋（擠壓） 鋼管 公稱外徑 （D) <57 ±0.40 ±0.30 57～325 S≤35 ±0.75%D ±0.5%D S>35 ±1%D ±0.75%D >325～600 +1%D或+5，取較小者-2 — >600 +1%D或+7，取較小者-2 — 公稱壁厚 (S) ≤4.0 ±0.45 ±0.35 >4.0～20 +12.5%S -10%S ±10%S >20 D<219 ±10%S ±7.5%S D≥219 +12.5%S -10%S ±10%S ? 表1（續(xù)） 單位為毫米 分類代號 制造方式 鋼管尺寸 允許偏差 普通級 高級 W-H 熱擴(kuò)鋼管 公稱外徑 （D) 全部 ±1%D ±0.75%D 公稱壁厚 (S) 全部 +20%S -10%S +15%S -10%S W-C 冷拔（軋） 鋼管 公稱外徑 (D) ≤25.4 ±0.15 — >25.4～40 ±0.20 — >40～50 ±0.25 — >50～60 ±0.30 — >60 ±0.5% D — 公稱壁厚 (S) ≤3.0 ±0.3 ±0.2 >3.0 ±10%S ±7.5%S 表2 鋼管最小壁厚的允許偏差 單位為毫米 分類代號 制造方式 壁厚范圍 允許偏差 普通級 高級 W-H 熱軋（擠壓）鋼管 Smin≤4.0 +0.9 0 +0.7 0 Smin>4.0 +25%Smin 0 +22%Smin 0 W-C 冷拔（軋）鋼管 Smin≤3.0 +0.6 0 +0.4 0 Smin>3.0 +20%Smin 0 +15%Smin 0 5.2長度 5.2.1通常長度 5.2.1.1鋼管的通常長度為4000 mm～12000mm。 5.2.1.2經(jīng)供需雙方協(xié)商，并在合同中注明，可交付長度大于12000 mm或短于4 000 mm但不短于3000 mm的鋼管；長度短于4000 mm但不短于3000 mm的鋼管，其數(shù)量應(yīng)不超過該批鋼管交貨總數(shù)量的5 % 5.2.2定尺長度和倍尺長度 根據(jù)需方要求，經(jīng)供需雙方協(xié)商，并在合同中注明，鋼管可按定尺長度或倍尺長度交貨。鋼管的定尺長度允許偏差為 。每個倍尺長度應(yīng)按下述規(guī)定留出切口余量： a) D≤159 mm 時，切口余量為5 mm～10mm； ? b)D>159 mm時，切口余量為10 mm～15 mm。 5.3彎曲度 5.3.1鋼管的每米彎曲度應(yīng)符合如下規(guī)定： a)S≤15mm時、不大于 1.5 mm/m； b)15 mm30 mm 時，不大于 3.0 mm/m。 5.3.2D≥127 mm的鋼管，其全長彎曲度應(yīng)不大于鋼管長度的0.10%。 5.3.3根據(jù)需方要求，經(jīng)供需雙方協(xié)商，并在合同中注明，鋼管的每米彎曲度和全長彎曲度可采用其他規(guī)定。 5.4不圓度和壁厚不均 根據(jù)需方要求，經(jīng)供需雙方協(xié)商，并在合同中注明，鋼管的不圓度和壁厚不均應(yīng)分別不超過外徑和壁厚公差的80%。 5.5端頭外形 鋼管兩端端面應(yīng)與鋼管軸線垂直，切口毛刺應(yīng)予清除。 5.6 重量 5.6.1交貨重量 5.6.1.1鋼管按公稱外徑和公稱壁厚或公稱內(nèi)徑和公稱壁厚交貨時，鋼管按實(shí)際重量交貨，亦可按理論 重量交貨。 5.6.1.2鋼管按公稱外徑和最小壁厚交貨時，鋼管按實(shí)際重量交貨；供需雙方協(xié)商，并在合同中注明，鋼 管亦可按理論重量交貨。 5.6.2理論重量的計算 鋼管理論重量的計算按GB/T 17395的規(guī)定（鋼的密度按7.85 kg/dm3)，不銹（耐熱）鋼鋼管的理論 重量為按GB/T 17395規(guī)定計算理論重量的1.015倍。 按最小壁厚交貨鋼管，應(yīng)釆用平均壁厚計算理論重量；按公稱內(nèi)徑交貨鋼管，應(yīng)釆用計算外徑計算 理論重量。 5.6.3重量允許偏差 根據(jù)需方要求，經(jīng)供需雙方協(xié)商，并在合同中注明，交貨鋼管實(shí)際重量與理論重量的偏差應(yīng)符合如 下規(guī)定： a)單根鋼管：±10%； b)每批最小為10t的鋼管：±7.5%。 6技術(shù)要求 6.1鋼的牌號和化學(xué)成分 6.1.1 鋼的牌號和化學(xué)成分(熔煉成分)應(yīng)符合表3的規(guī)定。 6.1.2鋼中殘余元素的含量應(yīng)符合表4的規(guī)定。 ? 6.1.3成品鋼管的化學(xué)成分允許偏差應(yīng)符合表5的規(guī)定。成品化學(xué)成分的相關(guān)術(shù)語、定義和判定方法應(yīng)符合GB/T 222的規(guī)定 6.2 制造方法 6.2.1鋼的冶煉方法 6.2.1.1優(yōu)質(zhì)碳素結(jié)構(gòu)鋼和合金結(jié)構(gòu)鋼應(yīng)釆用電弧爐加爐外精煉并經(jīng)真空精煉處理，或氧氣轉(zhuǎn)爐加爐 外精煉并經(jīng)真空精煉處理.或電渣重熔法冶煉。 6.2.1.2不銹(耐熱）鋼應(yīng)采用電弧爐加爐外精煉.或轉(zhuǎn)爐加爐外精煉，或電渣重熔法冶煉。 6.2.1.3經(jīng)供需雙方協(xié)商，并在合同中注明，可采用其他較高要求的冶煉方法。需方指定某一種冶煉方法時，應(yīng)在合同中注明。 6.2.2管坯的制造方法及要求 6.2.2.1管坯可采用連鑄、模鑄或熱軋(鍛)方法制造。 6.2.2.2連鑄管坯應(yīng)符合YB/T 4149的規(guī)定，其中低倍組織缺陷中心裂紋、中間裂紋、皮下裂紋和皮下氣泡的級別應(yīng)分別不大于1級，也可釆用經(jīng)相關(guān)各方認(rèn)可的其他更高質(zhì)量要求；熱軋（鍛)管坯應(yīng)符合 YB/T 5137的規(guī)定；模鑄管坯（鋼錠）可參照熱軋(鍛）管坯的規(guī)定執(zhí)行。 6.2.3鋼管的制造方法 6.2.2.3.1牌號為08Cr18Ni11NbFG的鋼管應(yīng)采用冷拔（軋）無縫方法制造，其他鋼管應(yīng)采用熱軋（擠壓、 擴(kuò))或冷拔（軋）無縫方法制造。 6.2.3.2熱擴(kuò)鋼管應(yīng)是坯料鋼管經(jīng)整體加熱后擴(kuò)制變形而成的更大口徑的鋼管。 6.2.3.3采用連鑄或模鑄鋼坯直接軋制的鋼管，其加工變形總延伸系數(shù)應(yīng)不小于3。釆用電渣錠直接軋制的鋼管，其加工變形總延伸系數(shù)應(yīng)不小于2。