標準編號:	NB/T 47008-2010
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 equipments
行業分類:	NB    能源行業標準
發布機構:	國家能源局
發布日期:	2010-08-27
實施日期:	2010-12-15
標準狀態:	superseded
被新標準替代:	NB/T 47008-2017 承壓設備用碳素鋼和合金鋼鍛件 NB/T 47010-2017 承壓設備用不銹鋼和耐熱鋼鍛件
被替代日期:	2017-8-1
替代舊標準:	JB 4726-2000 壓力容器用碳素鋼和低合金鋼鍛件
翻譯語言:	英文
文件格式:	PDF
中文字符數:	12000 字
翻譯價格(元):	100.0
交付時間:	付款后 1 個工作日

There have been some significant changes in this standard over JB 4726-2000: ——Design pressure in application scope has been improved to less than 100MPa from not larger than 35MPa; ——Add five steel grades, namely 20MnNiMo, 15NiCuMoNb, 12Cr2Mo1V, 12Cr3MolV and 10Cr9Mo1VNb; ——Degrade phosphorus and sulfur contents of a majority of steel grades; ——Add tensile property index of nominal thickness less than or equal to 100mm for 20Mn and 16Mn steel grades of forgings; ——Improve strength index of 15CrMo and 12CrIMoV steel forgings; ——Improve impact power index of all the steel forgings; ——Describe clearly that the Grade I forgings are only applicable to 20, 35 and 16Mn steel grades of nominal thickness less than or equal to 100mm. The Appendix A in this standard is normative. This standard is proposed by and under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262). Drafting organizations of this standard: Hefei General Machinery Research Institute, China National General Machinery Engineering Corporation, China Special Equipment Inspection and Research Institute, China First Heavy Industries, Anhui Bureau of Quality and Technical Supervision, Shanghai Power Equipment Research Institute, Wuxi flange forging Co,. Ltd and Jiangyin Fangyuan Ringlike Forging& Flange Co., Ltd Drafting staffs of this standard: Zhang Xiaohu, Qin Xiaozhong, Zhang Yong, Yang Guoyi, Zhang Wenhui, Zhang Rui, Teng Mingde, Ye Jianping, Chen Zhiwei and Zhao Yuanzhong. National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262) is in the charge of the explanation of this standard. This part replaces the following editions in turn: ——JB 4726-1994; ——JB 4726-2000. PROFESSIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA 中華人民共和國行業標準 NB/T 47008-2010 (JB/T 4726) Carbon and Alloy Steel Forgings for Pressure Equipments 承壓設備用碳素鋼和合金鋼鍛件 1 Scope This standard specifies the technical requirements, test methods and inspection rules, etc. for carbon steel and alloy steel forgings for pressure equipments. This standard is applicable to carbon steel and alloy steel forgings for pressure equipments with a design temperature not less than -20℃ and design pressure below 100Mpa. 2 Normative References The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the dated versions apply to this standard. For undated references, the latest edition of the normative document (include all the amendments) is applicable to this standard. GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products GR/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (ISO 6892:1998 (E)) GBIT/229-2007Metallic materials-Charpy pendulum impact test method (ISO 148-1:2006) GB/T 23 1.1 Metallic Materials-Vickers Hardness Test-Part 1: Test Method (1S0 6506-1:2005) GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-Alloy Steel (Routine Method) GB/T 4338 Metallic Materials-Tensile Testing at Elevated Temperature (ISO 783:1999) GB/f 6394 Metal-methods for Estimating the Average Grain Size (ASTM E112:1996) GB/T 10561 Steel-Determination of Content of Nonmetallic Inclusions-Micrographic Method Using Standards Diagrams (1S0 4967: 1998) GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition (IS0 14284:1996) JB/T 4730.3 Non-destructive Testing of Pressure Equipment Part Three: Ultrasonic Testing 3 Terms and Definitions This standard applies the following terms and definitions. 3.1 Hollow forging It refers to axisymmetrical hollow forging, whose axial length L is greater than its outer diameter D, as shown in Fig. 1a). t shall be the nominal thickness. 3.2 Ring forging It refers to axisymmetrical hollow forging, whose axial length L is less than or equal to its outer diameter D, as shown in Fig. 1b). The smaller one of L and t shall be the nominal thickness. 3.3 Disk forging It refers to axisymmetrical solid forging, whose axial length l is less than or equal to its outer diameter D, as shown in Fig. 1c). L shall be the nominal thickness. 3.4 Bowl forging It refers to axisymmetrical forging with concave section, whose length H is less than or equal to its outer diameter D, as shown in Fig. 1d). The greater one between t1 and t2 shall be the nominal thickness. 3.5 Neck flange forging It refers to axisymmetrical neck flange with two axial outside diameters, as shown in Fig. 1e). The greater one of t1 and t2 shall be the nominal thickness. 3.6 Bar forging It refers to solid forging with circle section, whose axial length L is greater than its outer diameter D, as shown in fig. 1f). D shall be the nominal thickness. Forging with rectangular section, whose length L is greater than its side lengths a, b, as shown in Fig. 1g). The smaller one of a and b shall be the nominal thickness. 4 Ordering Information 4.1 The Buyer shall indicate the standard number, steel grade, forging class, supply status and quantity, etc. in the order contract. 4.2 The Buyer shall provide order drawing. 4.3 When the additional requirements in Appendix A (Normative) of this standard and other requirements, which exceed or are higher than this standard are used, they shall be indicated in the order contract by the Buyer. 5 Technical Requirements 5.1 Smelting process Steel for forging shall be the killed steel smelted by electric furnace, oxygen converter. Smelting methods, such as electroslag remelting, external furnace refining may be used through mutual consultation. 5.2 Chemical composition 5.2.1 The chemical composition (heat analysis) of steel for forging shall comply with the stipulations in Table 1. 5.2.2 It is noted in the contract that P and s contents of 20, 35 and 16Mn steels may be p≤0.025% and S≤0.015% As required by the Buyer. 5.2.3 The Buyer may carry out product analysis, the permissible deviation between the analysis results and the specified values in Table 1 shall comply with the stipulations in Table 2 of GB/T 222. The permissible positive deviation is 0.003% for the steel grade of p≤0.020% in Table 1; the permissible positive deviation is 0.002% for steel type of S≤0.012%.

Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 4 Ordering Information 5 Technical Requirements 6 Test Methods 7 Inspection Rules 8 Marking and Quality Certificate Appendix A (Normative) Additional Requirements

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