標準編號:	NB/T 47008-2017
中文名稱:	承壓設備用碳素鋼和合金鋼鍛件
英文名稱:	Carbon and alloy steel forgings for pressure equipment
中標分類:	J32    鍛壓
行業分類:	NB    能源行業標準
ICS分類:	77.140.85 77.140.85    鋼鐵鍛件 77.140.85
發布機構:	國家能源局
發布日期:	2017-03-28
實施日期:	2017-8-1
標準狀態:	valid
替代舊標準:	NB/T 47008-2010 承壓設備用碳素鋼和合金鋼鍛件 JB/T 9626-1999 鍋爐鍛件 技術條件 NB/T 47008~NB/T 47010-2010 承壓設備用碳素鋼和合金鋼鍛件[合訂本]
翻譯語言:	英文
文件格式:	PDF
中文字符數:	22000 字
翻譯價格(元):	800.0
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 according to the rules given in GB/T 1.1-2009 Directives for Standardization - Part 1: Structure and Drafting of Standards. This standard incorporates relevant content of JB/T 9626-1999 Specification for Bolier Forging, replaces NB/T 47008-2010 Carbon and Alloy Steel Forgings for Pressure Equipments and has the following main technical changes with respect to NB/T 47008-2010: ——5 steel forging designations including 12CrMo, 30CrMo, 10Cr9MoW2VNbBN, 09CrCuSb, 08Cr2AlMo and 2 steel forging designations for ultrahigh pressure vessel including 35CrNi3MoV, 36CrNi3MoV are added; ——The contents on design pressure and temperature are cancelled from Scope; ——Relevant requirements of order contents are refined; ——Requirements on macroscopic inspection are added; ——Requirements on metallographic inspection are added; ——The quality grade for steel forging ultrasonic testing is increased; ——Requirements on hydrogen induced cracking (HIC) test are added; ——The criteria permissible for soldering are modified; ——6 designations of forgings for matched valve and special component including 25, 25Cr2MoV, 25Cr2Mo1V, 20Cr1Mo1VNbTiB, 20Cr1Mo1VTiB and 38CrMoAl are added; ——High-temperature mechanical property table for common forging steel is added. Annex A and Annex C are informative while Annex B is normative. This standard was proposed by and under the jurisdiction of the China Standardization Committee on Boilers and Pressure Vessels (SAC/TC 262). The previous editions of the standard replaced by this standard are as follows: ——JB 4726-1994; ——JB/T 9626-1999; ——JB 4726-2000; ——NB/T 47008-2010. Carbon and Alloy Steel Forgings for Pressure Equipment 1 Scope This standard specifies terms and definitions, order contents, technical requirements, test methods, inspection rules as well as marking and quality certificate of carbon steel and alloy steel forgings for pressure equipment. 2 Normative References The following documents for the application of this document are essential. For dated reference, only the edition cited applies. For undated reference, its latest edition (including any amendments) applies. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy (Applicable Parts) GB/T 226 Test Method for Macrostructure and Defect of Steel by Etching 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 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method GB/T 4336 Carbon and Low-alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 6394 Metal-methods for Estimating the Average Grain Size GB/T 8650 Evaluation of Pipeline and Pressure Vessel Steels for Resistance to Hydrogen-Induced Cracking GB/T 10561 Steel-Determination of Content of Nonmetallic Inclusions-Micrographic Method Using Standards Diagrams GB/T 13298 Inspection Methods of Microstructure for Metals 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 (Routine Method) NB/T 47013.3 Nondestructive Testing of Pressure Equipments - Part 3: Ultrasonic Testing NB/T 47013.4 Nondestructive testing of pressure Equipments - Part 4: Magnetic Particle Testing NB/T 47013.5 Nondestructive Testing of Pressure Equipments - Part 5: Penetrant Testing 3 Terms and Definitions 3.1 hollow forging the axisymmetric hollow forging with axial length L greater than outside diameter D, as shown in Figure 1a); t refers to nominal thickness 3.2 ring forging the axisymmetric hollow forging with axial length L less than or equal to outside diameter D, as shown in Figure 1b); L or t, whichever is smaller, refers to nominal thickness 3.3 disk forging the axisymmetric solid forging with axial length L less than or equal to outside diameter D, as shown in Figure 1c); L refers to nominal thickness 3.4 bowl forging the axisymmetric forging with axial length H less than or equal to outside diameter D and with concave section, as shown in Figure 1d); t1 or t2, whichever is larger, refers to nominal thickness 3.5 neck flange forging the axisymmetric hollow forging with two outside diameters in axial direction, as shown in Figure 1e); t1 or t2, whichever is larger, refers to nominal thickness 3.6 bar forging the solid forging with axial length L greater than outside diameter D and with circular section, as shown in Figure 1f); D refers to nominal thickness the forging with length L greater than two side lengths a and b and with rectangular section, as shown in Figure 1g); a or b, whichever is smaller, refers to nominal thickness a) Hollow forging b) Ring forging c) Disk forging d) Bowl forging e) Neck flange forging f) Bar forging (circular section) g) Bar forging (rectangular section) Figure 1 Forging Shape 4 Order Contents The order contract by reference to this standard shall include the following contents: a) Product name; b) Order drawing; c) Standard No.; d) Material designation; e) Forging grade; f) Quantity (or quality); g) Delivery state (including heat treatment and surface requirements); h) Non-destructive testing requirements; i) Additional technical requirements. 5 Technical Requirements 5.1 Smelting method Steel for forgings shall be killed steel subject to electric furnace or oxygen converter smelting and external refining, for which electroslag remelting and other smelting method shall be adopted through negotiation between the supplier and the purchaser. 5.2 Chemical composition 5.2.1 Melting analysis 5.2.1.1 Designation and chemical composition of steel for forgings (melting analysis) shall meet the requirements of Table 1. 5.2.1.2 Designation and chemical composition of steel for matched valve and special component forgings may refer to Annex A. 5.2.1.3 As required by the purchaser and indicated in the contract, P and S contents of 35# steel in Table 1 may be: P≤0.025% and S≤0.015%. 5.2.2 Product analysis 5.2.2.1 The purchaser may perform product analysis and permissible deviation between corresponding analysis result and specified value in Table 1 shall meet the requirements of GB/T 222. 5.2.2.2 For designations with P≤0.020% in Table 1, permissible positive deviation for phosphorus content in product analysis is 0.003%; for designations with S≤0.010% in Table 1, permissible positive deviation for sulfur content in product analysis is 0.002%.

Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Order Contents 5 Technical Requirements 6 Test Methods 7 Inspection Rules 8 Marking and Quality Certificate Annex A (Informative) Forgings for Matched Valves and Special Components of Boiler Annex B (Normative) Additional Requirements Annex C (Informative) High-temperature Mechanical Properties

前言 本標準與JB 4726—2000相比，主要變化如下： ——適用范圍中的設計壓力由不大于35MPa提高到小于100MPa； ——增加了20MnNiMo、15NiCuMoNb、12Cr2Mo1V、12Cr3Mo1V和10Cr9Mo1VNb五個鋼號； ——降低了大部分鋼號的磷、硫含量； ——對20和16Mn兩個鋼號的鍛件，增列了公稱厚度小于或等于100mm的拉伸性能指標； ——提高了15crMo和12cr1MoV鋼鍛件的強度指標； ——提高了所有鋼鍛件的沖擊功指標； ——明確了Ⅰ級鍛件僅適用于公稱厚度小于或等于100mm的20、35和16Mn三個鋼號。 本標準的附錄A為規范性附錄。 本標準由全國鍋爐壓力容器標準化技術委員會(SAC／TC 262)提出并歸口。 本標準起草單位：合肥通用機械研究院、中國通用機械工程總公司、中國特種設備檢測研究院、中國第一重型機械集團、安徽省質量技術監督局、上海發電設備成套設計研究院、無錫市法蘭鍛造有限公司、江陰方圓環鍛法蘭有限公司。 本標準起草人：章小滸、秦曉鐘、張勇、楊國義、張文輝、張瑞、滕明德、許建平、陳志偉、趙元忠。 本標準由全國鍋爐壓力容器標準化技術委員會(SAC/TC 262)負責解釋。 本標準所代替標準的歷次版本發布情況為： ——JB 4726—1994： ——JB 4726—2000。 表1 鋼號 化學成分(質量分數)，% C Si Mn Cr Mo Ni Cu V Nb Ti Al N B P S 20 0.17～0.23 0.15～0.40 0.60～1.00 ≤0.25 — ≤0.25 ≤0.25 — — — — — — ≤0.030 ≤0.020 35 0.32～0.38 0.15～0.40 0.50～0.80 ≤0.25 — ≤0.25 ≤0.25 — — — — — — ≤0.030 ≤0.020 16Mn 0.13～0.20 0.20～0.60 1.20～1.60 ≤0.30 — ≤0.30 ≤0.25 — — — — — — ≤0.030 ≤0.020 20MnMo 0.17～0.23 0.15～0.40 1.10～1.40 ≤0.30 0.20～0.35 ≤0.30 ≤0.25 — — — — — — ≤0.025 ≤0.015 20MnMoNb 0.17～0.23 0.15～0.40 1.30～1.60 ≤0.30 0.45～0.65 ≤0.30 ≤0.25 — 0.025～0.050 — — — — ≤0.025 ≤0.015 20MnNiMo 0.17～0.23 0.15～0.40 1.20～1.50 ≤0.25 0.45～0.60 0.40～1.00 ≤0.25 ≤0.050 — — — — — ≤0.020 ≤0.012 15NiCuMoNb 0.11～0.17 0.20～0.50 0.80～1.20 ≤0.30 0.25～0.50 1.00～1.30 0.50～0.80 ≤0.020 0.015～0.045 — ≤0.050 ≤0.020 — ≤0.025 ≤0.015 35CrMo 0.32～0.38 0.15～0.40 0.40～0.70 0.80～1.10 0.15～0.25 ≤0.30 ≤0.25 — — — — — — ≤0.025 ≤0.015 15CrMo 0.12～0.18 0.10～0.60 0.30～0.80 0.80～1.25 0.45～0.65 ≤0.30 ≤0.25 — — — — — — ≤0.025 ≤0.015 12Cr1MoV 0.09～0.15 0.15～0.40 0.40～0.70 0.90～1.20 0.25～0.35 ≤0.30 ≤0.25 0.15～0.30 — — — — — ≤0.025 ≤0.015 14Cr1Mo 0.11～0.17 0.50～0.80 0.30～0.80 1.15～1.50 0.45～0.65 ≤0.30 ≤0.25 — — — — — — ≤0.025 ≤0.015 12Cr2Mo1 ≤0.15 ≤0.50 0.30～0.60 2.00～2.50 0.90～1.10 ≤0.30 ≤0.25 — — — — — — ≤0.020 ≤0.012 12Cr2Mo1V ≤0.15 ≤0.10 0.30～0.60 2.00～2.50 0.90～1.10 ≤0.25 ≤0.25 0.25～0.35 — — — — — ≤0.012 ≤0.010 12Cr3Mo1V ≤0.15 ≤0.10 0.30～0.60 2.70～3.30 0.90～1.10 ≤0.25 ≤0.25 0.20～0.30 ≤0.070 0.015～0.035 — — 0.001～0.003 ≤0.012 ≤0.010 1Cr5Mo ≤0.15 ≤0.50 ≤0.60 4.00～6.00 0.45～0.65 ≤0.50 ≤0.25 — — — — — — ≤0.025 ≤0.015 10Cr9Mo1VNb 0.08～0.12 0.20～0.50 0.30～0.60 8.00～9.50 0.85～1.05 ≤0.40 ≤0.25 0.18～0.25 0.06～0.10 — ≤0.040 0.030～0.070 — ≤0.020 ≤0.010 表2 鍛件級別 檢驗項目 檢驗數量 Ⅰ 硬度(HBW) 逐件檢驗 Ⅱ 拉伸和沖擊(Rm、ReL、A、KV2) 同冶煉爐號、同爐熱處理的鍛件 組成一批，每批抽儉一件 Ⅲ 拉伸和沖擊(Rm、ReL、A、KV2) 超聲檢測 逐件檢驗 Ⅳ 拉伸和沖擊(Rm、ReL、A、KV2) 逐件檢驗 超聲檢測 逐件檢驗 表3 鋼號 公稱厚度 mm 熱處理狀態 回火溫度℃ 拉伸試驗 沖擊試驗 硬度試驗 Rm MPa ReL MPa A % 試驗溫度 ℃ KV2 J HBW 不低于 不小于 不小于 20 ≤100 N N＋T 620 410～560 235 24 0 31 110～160 ＞100～200 400～550 225 24 — ＞200～300 380～530 205 24 35 ≤100 N N＋T 590 510～670 265 18 20 34 136～192 ＞100～300 490～640 245 18 — 16Mn ≤100 N N＋T Q＋T 620 480～630 305 20 0 34 128～180 ＞100～200 470～620 295 20 — ＞200～300 450～600 275 20 20MnMo ≤300 Q＋T 620 530～700 370 18 0 41 — ＞300～500 510～680 350 18 ＞500～700 490～660 330 18 20MnMoNb ≤300 Q＋T 630 620～790 470 16 0 41 — ＞300～500 610～780 460 16 20MnNiMo ≤500 Q＋T 620 620～790 450 16 －20 41 — 15NiCuMoNb ≤500 N＋T Q＋T 640 610～780 440 17 20 47 — 35CrMo ≤300 Q－T 580 620～790 440 15 0 41 — ＞300～500 610～780 430 15 15CrMo ≤300 N＋T Q＋T 620 480～640 280 20 20 47 — ＞300～500 470～630 270 20 12Cr1MoV ≤300 N＋T Q＋T 680 470～630 280 20 20 47 — ＞300～500 460～620 270 20 14Cr1Mo ≤300 N＋T Q＋T 620 490～660 290 19 20 47 — ＞300～500 480～650 280 19 12Cr2Mo1 ≤300 N＋T Q＋T 680 510～680 310 18 20 47 — ＞300～500 500～670 300 18 12Cr2Mo1V ≤300 N＋T Q＋T 680 590～760 420 17 －20 60 — ＞300～500 580～750 410 17 12Cr3MoV ≤300 N＋T Q＋T 680 590～760 420 17 －20 60 — ＞300～500 590～760 410 17 1Cr5Mo ≤500 N＋T Q＋T 680 590～760 390 18 20 47 — 10Cr9Mo1VNb ≤500 N＋T Q＋T 740 590～760 420 18 20 47 — 注：如屈服現象不明顯，屈服強度取Rp0.2。 表4 鍛件分類 超聲檢測質量等級 單個缺陷 底波降低量 密集區缺陷 筒形 鍛件 用于筒節 Ⅱ Ⅰ Ⅱ 用于筒體端部法蘭 Ⅲ Ⅲ Ⅱ 環形鍛件 Ⅱ Ⅱ Ⅱ 餅形 鍛件 公稱厚度≤200mm Ⅲ Ⅲ Ⅲ 公稱厚度＞200mm Ⅳ Ⅳ Ⅳ 碗形鍛件 Ⅲ Ⅲ Ⅱ 長頸法蘭鍛件 Ⅲ Ⅲ Ⅱ 條形鍛件 Ⅲ Ⅱ Ⅱ 表A.1 鋼號 公稱厚度 mm 在下列溫度(℃)下得Rp0.2（ReL），MPa不小于 200 250 300 350 400 450 500 20MnMo ≤300 305 295 285 275 260 240 — ＞300～500 290 280 270 260 245 225 — ＞500～700 280 270 260 250 235 215 — 20MnMoNb ≤300 405 395 385 370 355 335 — ＞300～500 405 395 385 370 355 335 — 20MnNiMo ≤500 395 385 380 370 355 335 — 15NiCuMoNb ≤500 385 375 365 350 335 315 — 35CrMo ≤300 370 360 350 335 320 295 — ＞300～500 370 360 350 335 320 295 — 15CrMo ≤300 — — 200 190 180 170 160 ＞300～500 — — 190 180 170 160 150 12Cr1MoV ≤300 — — — 200 190 180 170 ＞300～500 — — — 190 180 170 160 14Cr1Mo ≤300 — — 220 210 200 190 175 ＞300～500 — — 210 200 190 180 170 12Cr2Mo1 ≤300 — — — 245 240 230 215 ＞300～500 — — — 240 235 225 215 12Cr2Mo1V ≤300 — — — 355 350 340 325 ＞300～500 — — — 350 345 335 320 12Cr3Mo1V ≤300 — — — 355 350 340 325 ＞300～500 — — — 350 345 335 320