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NB/T 47008-2017: Carbon and alloy steel forgings for pressure equipment Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid NB/T 47008: Historical versions
Similar standardsNB/T 47008-2017: Carbon and alloy steel forgings for pressure equipment---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/NBT47008-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.85 J 32 Replacing NB/T 47008-2010, JB/T 9626-1999 Carbon and alloy steel forgings for pressure equipment Issued on. MARCH 28, 2017 Implemented on. AUGUST 01, 2017 Issued by. National Energy Administration Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Order content... 8 5 Technical requirements... 9 6 Test methods... 17 7 Inspection rules... 18 8 Markings and quality certificates... 21 Annex A (informative) Forgings for supporting valves and special components of boilers... 22 Annex B (normative) Additional requirements... 24 Annex C (informative) High temperature mechanical properties... 261 ScopeThis Standard specifies terms and definitions, order content, technical requirements, test methods, inspection rules and markings and quality certificates of carbon and alloy steel forgings for pressure equipment.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the dated edition cited applies. For undated references, the latest edition of the referenced document (including all 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)3 Terms and definitions3.1 hollow forging Axisymmetric hollow forging with an axial length L greater than its outer diameter D, as shown in Figure 1 a). t is the nominal thickness. 3.2 ring forging Axisymmetric hollow forging with an axial length L less than or equal to its outer diameter D, as shown in Figure 1 b). The smaller one of L and t is the nominal thickness. 3.3 disk forging Axisymmetric solid forging with an axial length L less than or equal to its outer diameter D, as shown in Figure 1 c). L is the nominal thickness. 3.4 bowl forging Axisymmetric forging with a concave cross-section and an axial length H less than or equal to its outer diameter D, as shown in Figure 1 d). The larger one of t1 and t2 is the nominal thickness.4 Order contentThe order contract using this Standard shall include the following.5 Technical requirements5.1 Smelting method Forging steel shall be killed steel smelted using electric furnace or oxygen converter and subjected to secondary refining. Agreed upon between the supply and demand parties, electroslag remelting and other smelting methods can be used. 5.2 Chemical composition 5.2.1 Smelting analysis 5.2.2 Finished product analysis 5.2.2.1 The demand party may carry out the finished product analysis, and the analysis result and the allowable deviation of the specified value in Table 1 shall comply with the provisions of GB/T 222. 5.3 Forging 5.3.1 Steel ingots, steel billets or rolling materials for forging shall have a quality certificate of the smelting organization. 5.4 Forging grade 5.4.1 Forgings are divided into 4 grades, i.e. I, II, III and IV. The inspection items and inspection quantity of each grade shall comply with the provisions of Table 2. 5.6 Mechanical properties 5.6.1 The mechanical properties of finished forgings shall comply with the provisions of Table 3.The mechanical properties of other forgings for supporting valves and special components are shown in Annex A. 5.6.2 The three measured values of hardness test shall not exceed the limits specified in Table 3. 5.12 Repair by welding 5.12.1 Steel forgings are not allowed to be repaired by welding without the consent of the demand party. 5.12.2 As agreed by the demand party, the repair by welding of steel forgings shall comply with the provisions of relevant regulations and standards. The position, depth, area of repair by welding, welding material, welding technology, welder qualification requirements, nondestructive testing methods and qualification grades before and after repair by welding shall be agreed upon between the supply and demand parties.6 Test methods6.1 Chemical analysis The chemical analysis shall comply with the provisions of GB/T 223, GB/T 4336, GB/T 20123, GB/T 20124.The arbitration test shall comply with the provisions of GB/T 223. 6.2 Tensile test The room temperature tensile test shall comply with the provisions of GB/T 228.1, and the high temperature tensile test shall comply with the provisions of GB/T 228.2. 6.7 Ultrasonic testing The ultrasonic testing shall comply with the provisions of NB/T 47013.3. 6.8 Appearance inspection The appearance inspection of forgings shall be visual inspection under full lighting conditions.7 Inspection rules7.1 Inspection The inspection of forgings is carried out by the supply party’s inspection department. 7.2 Sample requirements 7.3 Sampling quantity 7.3.1 Chemical analysis TAKE 1 sample form each smelting furnace for chemical analysis. 7.3.2 Tensile and impact 7.3.2.1 For heat treated forgings with a mass less than or equal to 3 500 kg, take 1 set of samples (1 for room temperature tensile, 3 for impact). 7.3.2.2 For heat treated forgings with a mass greater than 3 500 kg, take 2 sets of samples (in each set, 1 for room temperature tensile, 3 for impact), and 2 sets of samples are at an interval of 180 °. If the length of the forging is greater than 1.5 times the diameter, each take a set of samples at two ends of the forging and at an interval of 180 °. 7.5.3 Samples of bowl forgings shall be taken at 1/2 of the wall thickness at the open ends of the forgings, see Figure 2 d). 7.5.4 Samples of neck flange forgings shall be taken at the nominal thickness at a distance greater than or equal to 20 mm from the outer edge of the forgings (or from the inner surface), see Figure 2 e). 7.5.5 Samples for bar forgings shall be taken from the ends of the forgings and at 1/4 of the nominal thickness. 7.5.6 In addition to Grade IV forgings, samples for mechanical properties of forgings can also be prepared from the separately-forged inspection ingots from the same batch. The inspection ingots shall have the same forging technology with forgings, with the thickness greater than or equal to the nominal thickness of forgings, and are heat treated in the same furnace. 7.6.3 When the impact test results are unqualified, take 3 impact test samples from where near the original sampling part of the inspected forging for re-inspection. The qualification condition is that the arithmetic mean of the test data of 2 sets of samples, i.e. 6 samples, shall not be less than the provisions of Table 3, allowing two test data to be less than the specified value, of which only one is allowed to be less than 70 % of the specified value.8 Markings and quality certificates8.1 The marking shall be printed on the obvious part on forgings or the part specified by the demand party, and the location and manner of the marking shall not affect the use of forgings. For small forgings, the label may be stuck on the packaging box. 8.2 Forgings qualified and delivered according to this Standard shall have the following markings. NB/T 47008-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.85 J 32 Replacing NB/T 47008-2010, JB/T 9626-1999 Carbon and alloy steel forgings for pressure equipment Issued on. MARCH 28, 2017 Implemented on. AUGUST 01, 2017 Issued by. National Energy AdministrationTable of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Order content... 8 5 Technical requirements... 9 6 Test methods... 17 7 Inspection rules... 18 8 Markings and quality certificates... 21 Annex A (informative) Forgings for supporting valves and special components of boilers... 22 Annex B (normative) Additional requirements... 24 Annex C (informative) High temperature mechanical properties... 261 ScopeThis Standard specifies terms and definitions, order content, technical requirements, test methods, inspection rules and markings and quality certificates of carbon and alloy steel forgings for pressure equipment.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the dated edition cited applies. For undated references, the latest edition of the referenced document (including all 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)3 Terms and definitions3.1 hollow forging Axisymmetric hollow forging with an axial length L greater than its outer diameter D, as shown in Figure 1 a). t is the nominal thickness. 3.2 ring forging Axisymmetric hollow forging with an axial length L less than or equal to its outer diameter D, as shown in Figure 1 b). The smaller one of L and t is the nominal thickness. 3.3 disk forging Axisymmetric solid forging with an axial length L less than or equal to its outer diameter D, as shown in Figure 1 c). L is the nominal thickness. 3.4 bowl forging Axisymmetric forging with a concave cross-section and an axial length H less than or equal to its outer diameter D, as shown in Figure 1 d). The larger one of t1 and t2 is the nominal thickness.4 Order contentThe order contract using this Standard shall include the following.5 Technical requirements5.1 Smelting method Forging steel shall be killed steel smelted using electric furnace or oxygen converter and subjected to secondary refining. Agreed upon between the supply and demand parties, electroslag remelting and other smelting methods can be used. 5.2 Chemical composition 5.2.1 Smelting analysis 5.2.2 Finished product analysis 5.2.2.1 The demand party may carry out the finished product analysis, and the analysis result and the allowable deviation of the specified value in Table 1 shall comply with the provisions of GB/T 222. 5.3 Forging 5.3.1 Steel ingots, steel billets or rolling materials for forging shall have a quality certificate of the smelting organization. 5.4 Forging grade 5.4.1 Forgings are divided into 4 grades, i.e. I, II, III and IV. The inspection items and inspection quantity of each grade shall comply with the provisions of Table 2. 5.6 Mechanical properties 5.6.1 The mechanical properties of finished forgings shall comply with the provisions of Table 3.The mechanical properties of other forgings for supporting valves and special components are shown in Annex A. 5.6.2 The three measured values of hardness test shall not exceed the limits specified in Table 3. 5.12 Repair by welding 5.12.1 Steel forgings are not allowed to be repaired by welding without the consent of the demand party. 5.12.2 As agreed by the demand party, the repair by welding of steel forgings shall comply with the provisions of relevant regulations and standards. The position, depth, area of repair by welding, welding material, welding technology, welder qualification requirements, nondestructive testing methods and qualification grades before and after repair by welding shall be agreed upon between the supply and demand parties.6 Test methods6.1 Chemical analysis The chemical analysis shall comply with the provisions of GB/T 223, GB/T 4336, GB/T 20123, GB/T 20124.The arbitration test shall comply with the provisions of GB/T 223. 6.2 Tensile test The room temperature tensile test shall comply with the provisions of GB/T 228.1, and the high temperature tensile test shall comply with the provisions of GB/T 228.2. 6.7 Ultrasonic testing The ultrasonic testing shall comply with the provisions of NB/T 47013.3. 6.8 Appearance inspection The appearance inspection of forgings shall be visual inspection under full lighting conditions.7 Inspection rules7.1 Inspection The inspection of forgings is carried out by the supply party’s inspection department. 7.2 Sample requirements 7.3 Sampling quantity 7.3.1 Chemical analysis TAKE 1 sample form each smelting furnace for chemical analysis. 7.3.2 Tensile and impact 7.3.2.1 For heat treated forgings with a mass less than or equal to 3 500 kg, take 1 set of samples (1 for room temperature tensile, 3 for impact). 7.3.2.2 For heat treated forgings with a mass greater than 3 500 kg, take 2 sets of samples (in each set, 1 for room temperature tensile, 3 for impact), and 2 sets of samples are at an interval of 180 °. If the length of the forging is greater than 1.5 times the diameter, each take a set of samples at two ends of the forging and at an interval of 180 °. 7.5.3 Samples of bowl forgings shall be taken at 1/2 of the wall thickness at the open ends of the forgings, see Figure 2 d). 7.5.4 Samples of neck flange forgings shall be taken at the nominal thickness at a distance greater than or equal to 20 mm from the outer edge of the forgings (or from the inner surface), see Figure 2 e). 7.5.5 Samples for bar forgings shall be taken from the ends of the forgings and at 1/4 of the nominal thickness. 7.5.6 In addition to Grade IV forgings, samples for mechanical properties of forgings can also be prepared from the separately-forged inspection ingots from the same batch. The inspection ingots shall have the same forging technology with forgings, with the thickness greater than or equal to the nominal thickness of forgings, and are heat treated in the same furnace. 7.6.3 When the impact test results are unqualified, take 3 impact test samples from where near the original sampling part of the inspected forging for re-inspection. The qualification condition is that the arithmetic mean of the test data of 2 sets of samples, i.e. 6 samples, shall not be less than the provisions of Table 3, allowing two test data to be less than the specified value, of which only one is allowed to be less than 70 % of the specified value.8 Markings and quality certificates8.1 The marking shall be printed on the obvious part on forgings or the part specified by the demand party, and the location and manner of the marking shall not affect the use of forgings. For small forgings, the label may be stuck on the packaging box. 8.2 Forgings qualified and delivered according to this Standard shall have the following markings. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of NB/T 47008-2017 be delivered?Answer: The full copy PDF of English version of NB/T 47008-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of NB/T 47008-2017_English with my colleagues?Answer: Yes. The purchased PDF of NB/T 47008-2017_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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