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Similar standardsGB/T 150.2-2024: Pressure vessels - Part 2: Materials---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/GBT150.2-2024GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.020.30 CCS J 74 Replacing GB/T 150.2-2011 Pressure vessels - Part 2.Materials Issued on. JULY 24, 2024 Implemented on. FEBRUARY 01, 2025 Issued by. State Administration for Market Regulation; National Standardization Administration. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 9 4 General requirements... 9 5 Steel plates... 17 6 Steel pipes... 24 7 Steel forgings... 30 8 Steel bars for studs (including bolts) and nuts... 33 9 Welding materials... 38 Appendix A (Normative) Supplementary provisions for steel... 40 Appendix B (Normative) Technical requirements that steel materials shall meet when included in this document... 43 Appendix C (Normative) Allowable stress... 48 Appendix D (Normative) Requirements for the use of Q235 series steel plates... 76 Appendix E (Informative) High-temperature yield strength, high-temperature endurance strength limit average value, elastic modulus, average linear expansion coefficient of steel materials... 78 Appendix F (Informative) Approximate comparison of high alloy steel designations 93 References... 95 Pressure vessels - Part 2.Materials1 ScopeThis document specifies the designations and standards of steel materials allowed for pressure components of steel pressure vessels, additional technical requirements for steel materials, the use range of steel materials (temperature and pressure), the allowable stress of steel materials, the basic requirements for welding materials. This document is applicable to pressure vessels, which have a design temperature of - 269 °C ~ 800 °C and a design pressure not exceeding 35 MPa. This document does not apply to the inapplicable scope specified in GB/T 150.1.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in the text. Among them, for referenced documents with dates, only the versions corresponding to the dates apply to this document; for referenced documents without dates, the latest versions (including all amendments) apply to this document. GB/T 150.1 Pressure vessels - Part 1.General requirements GB/T 150.3 Pressure vessels - Part 3.Design 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 699 Quality carbon structure steels GB/T 700 Carbon structural steels GB/T 709 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet GB/T 713.7 Steel plate, sheet and strip for pressure equipments - Part 7.Stainless steel and heat resisting steel3 Terms and definitionsThe terms and definitions, as defined in GB/T 150.1, apply to this document.4 General requirements4.1 This document makes relevant provisions for steel plates, steel pipes, steel forgings, studs (including bolts) and welding materials for pressure vessels. 4.2 Steel for pressure vessels shall be steel with good weldability; the steel for non- pressure components welded to pressure components shall also be steel with good weldability. 4.3 Austenitic stainless steel that is not included in this document but is included in GB/T 20878 and GB/T 713.7 is allowed; however, its technical requirements (such as phosphorus and sulfur content, strength index) shall not be lower than the provisions of designations with similar chemical composition in the corresponding steel standards included in this document. 4.4 When steel materials not listed in this document are used (except steel materials that meet the requirements of 4.3), their technical requirements shall comply with the relevant provisions of Appendix A.5 Steel plates5.1 Non-alloy steel and alloy steel plates 5.1.1 The service state, thickness, upper limit of service temperature, allowable stress of steel plates in GB/T 713.1, GB/T 713.2, GB/T 713.3, GB/T 713.4, GB/T 713.6 shall be in accordance with the provisions of Table C.1. 5.1.2 For all steel plates rolled from continuous casting billets or ingots in Table C.1, the compression ratio shall be not less than 3.0; for steel plates rolled from directional solidification billets, the compression ratio shall be not less than 2.4.The compression ratio of steel plates rolled from electroslag remelted steel billets shall not be less than 2.0. 5.1.3 The steel plates delivered by the steel plate manufacturer shall be supplied according to the use status in Table C.1. 5.1.4 The following non-alloy steel and low-alloy steel plates shall be used in the normalized state. a) Q245R, GB/SA516 Gr 485, Q345R used for the inner tube of multi-layer vessels; b) Q245R, GB/SA516 Gr 485, Q345R used for shell thickness greater than 36 mm; c) Q245R, GB/SA516 Gr 485, Q345R used for other pressure components (flanges, tube sheets, flat covers, etc.) with a thickness greater than 60 mm; d) For Q345R steel plates with a thickness greater than 50 mm, the normalized plus tempered state can replace the normalized state. 5.1.5 The following non-alloy steel and alloy steel plates shall be subjected to tensile and V-notch impact tests after heat treatment (impact test temperature shall comply with the corresponding steel plate standards). a) Quenched and tempered steel plates; b) Inner tube steel plates of multi-layer vessels; c) Steel plates with shell thickness greater than 60 mm.6 Steel pipes6.1 Non-alloy steel and alloy steel pipes 6.1.1 Steel pipe standards, use states, wall thickness, upper limit of use temperature, allowable stress shall be in accordance with the provisions of Table C.3.For steel pipes which have a wall thickness greater than 30 mm and a use temperature below -20 °C, the normalizing in the Table shall not be replaced by hot rolling with a final rolling temperature that meets the normalizing temperature. 6.1.2 The steel used for steel pipes, which have a design temperature below -20 °C in Table C.3, shall be refined in an electric arc furnace or oxygen converter and subjected to vacuum refining, or smelted by electroslag remelting. 6.1.3 The use requirements of 10, 20, Q345D steel pipes in GB/T 8163 are as follows. a) Steel used for steel pipes shall be refined in an electric arc furnace or oxygen converter and subjected to vacuum refining. b) It shall not be used for heat exchange tubes of shell and tube heat exchangers. c) The sulfur content in the steel shall not exceed 0.020%. d) The design pressure shall not exceed 4.0 MPa. e) The 10, 20, Q345D steel pipes, which have an outer diameter of not less than 76 mm and a wall thickness of not less than 6.5 mm, shall be subjected to longitudinal impact test. The impact test temperature is -10 °C, 0 °C, -20 °C, respectively. The average impact absorption energy of three standard specimens shall not be less than 34J, 34J, 41J, respectively. The minimum value of one standard specimen and the impact absorption energy index of small-sized specimens shall be in accordance with the provisions of 4.11b) and 4.11c). The impact specimen shall preferably be a larger-sized specimen. f) The lower limit of the use temperature of 10, 20, Q345D steel pipes is -10 °C, 0 °C, -20 °C, respectively. g) The wall thickness of 10 and 20 steel pipes shall not exceed 10 mm; the wall thickness of Q345D steel pipe shall not exceed 16 mm. h) It shall not be used for media with extremely or highly toxic hazard. i) Steel pipes shall be subjected to hydraulic test one by one. With the agreement between the supplier and the buyer, the eddy current test of steel pipes (one by one) can be carried out in accordance with GB/T 7735-2016 instead of the hydraulic test. The artificial defects of the comparison sample pipes shall comply with the provisions of the acceptance level E4H or E4, E5 in GB/T 7735-2016.7 Steel forgings7.1 Non-alloy steel and alloy steel forgings 7.1.1 The standards, service state, nominal thickness, upper limit of service temperature, allowable stress of steel forgings shall be in accordance with the provisions of Table C.5. 7.1.2 Steel for 20MnNiMo, 12Cr2Mo1V, 12Cr3Mo1V steel forgings and all low- temperature steel forgings in NB/T 47009 shall be treated by furnace refining and vacuum refining. 7.1.3 The type and grade of steel forgings shall be specified in the design documents and shall be indicated on the drawings (with the grade symbol attached after the designation, such as 16MnII, 09MnNiDIII). The following steel forgings shall be grade III or IV forgings. a) Cylindrical, annular, bowl-shaped forgings used as vessel shells and heads; b) Alloy steel forgings with a nominal thickness greater than 200 mm; c) Alloy steel forgings with a standard tensile strength lower limit greater than 540 MPa and a nominal thickness greater than 100 mm; d) Low-temperature steel forgings with a nominal thickness greater than 100 mm; e) Forgings for vessels for fatigue analysis. 7.1.4 Grade III or IV steel forgings of 20MnMoNb, 20MnNiMo, 12Cr2Mo1V, 12Cr3Mo1V steels for design temperatures above 350 °C shall be subjected to high temperature tensile tests (determination of yield strength and tensile strength) at the design temperature by batch (Grade III) or piece by piece (Grade IV). The yield strength values are shown in Table E.5. 7.1.5 For 12Cr2Mo1, 12Cr2Mo1V, 12Cr3Mo1V steel forgings, the design documents shall indicate the special requirements for their chemical composition and mechanical properties (including the properties after simulated post-weld heat treatment). 7.1.6 For purchased Grade IV forgings for Class III vessels, they shall be retested in accordance with the corresponding forging standards. 7.1.7 The lower limit of the service temperature of steel forgings shall be as specified in Table 5. 7.2 High alloy steel forgings 7.2.1 The standard, nominal thickness, upper limit of service temperature, allowable stress of steel forgings shall be in accordance with the provisions of Table C.6.The delivery status of steel forgings shall be in accordance with the provisions of NB/T 47010. 7.2.2 All steel for high alloy steel forgings shall be subjected to refining treatment outside the furnace. 7.2.3 The type and grade of steel forgings shall be specified in the design documents and shall be indicated on the drawings (with the grade symbol attached after the designation, such as S30408 II). Cylindrical, annular, bowl-shaped forgings used as vessel shells and heads shall be grade III or IV forgings. 7.2.4 The lower limit of the service temperature of steel forgings shall be in accordance with the following provisions. a) 0 °C for ferritic stainless steel forgings; b) -40 °C for austenitic-ferritic stainless steel forgings; c) -269 °C for austenitic stainless steel forgings.8 Steel bars for studs (including bolts) and nuts8.1 Non-alloy steel, low alloy steel, heat-resistant steel bars 8.1.1 The steel bar standards, use state, stud specifications, upper temperature limits and allowable stresses shall be in accordance with the provisions of Table C.7. 8.1.2 Non-alloy steel 20 steel and 35 steel stud steel bars shall comply with the provisions of GB/T 699; the stud blanks shall be subjected to normalizing heat treatment. 8.1.3 Low alloy steel bars for steel stud shall comply with the provisions of GB/T 3077. When selecting 40MnB, 40MnVB, 40Cr, 30CrMo, 35CrMo, 35CrMoV, 25Cr2MoV, 40CrNiMo, high-grade high-quality steel (with "A" added after the designation) or special high-quality steel (with "E" added after the designation) shall be selected. The stud blanks shall be subjected to quenching and tempering heat treatment in accordance with the provisions of Table 6. specifications greater than or equal to M36 shall be subjected to 100% ultrasonic testing in accordance with NB/T 47013.3, with a qualified level of Level I. At the same time, surface testing shall be carried out in accordance with NB/T 47013.4 or NB/T 47013.5; the quality level of linear defect tracks and circular defect tracks shall be Level I. 8.3.2 The threads of studs shall be processed by rolling. After thread machining, surface testing shall be carried out in accordance with NB/T 47013.4 or NB/T 47013.5; there shall be no crack display and no transverse defect display.9 Welding materials9.1 Welding materials for pressure-bearing components of pressure vessels shall comply with the provisions of NB/T 47018.1 ~ NB/T 47018.5. 9.2 The tensile strength of the deposited metal of welding materials for pressure vessel’s pressure components shall not be lower than the lower limit specified in the steel standard. 9.3 The impact absorption energy of the deposited metal of materials for pressure vessel’s pressure components shall not be lower than the specified value of the corresponding steel standard. When the impact absorption energy is lower than the specified value of the corresponding steel standard, the welding test piece shall be made according to the method of NB/T 47014; the impact absorption energy index of the weld metal shall be as specified in Table 1. 9.4 The post-weld heat treatment insulation temperature of the deposited metal of welding materials for pressure vessel’s pressure components used for post-weld heat treatment shall be the same as the insulation temperature of the post-weld heat treatment of the pressure vessel; the insulation time shall not be less than 80% of the cumulative insulation time during the pressure vessel manufacturing process. 9.5 The phosphorus content in the chemical composition of the deposited metal of steel, which has a standard tensile strength lower limit greater than 540 MPa, or welding materials for pressure vessels, which have a use temperature below -40 °C, shall be less than or equal to 0.020%; the sulfur content shall be less than or equal to 0.010%. 9.6 The diffusible hydrogen content of the deposited metal of welding materials for steel, which has a thickness greater than 36 mm and a standard tensile strength lower limit greater than 540 MPa, shall not exceed 5 mL/100 g. The measurement of the diffusible hydrogen content of the deposited metal shall be carried out in accordance with GB/T 3965. 9.7 The deposited metal of welding materials for steel, which has a thickness greater than 60 mm in normalized or normalized and tempered state, may be subjected to an additional drop hammer test. The test shall be carried out in accordance with GB/T 6803, using P-2 type specimens; the qualified index of non-ductile transition temperature (NDTT) shall be specified in the design documents. 9.8 For shell steel plates, which have a thickness greater than 50 mm in the quenched and tempered state and a thickness greater than 100 mm in the normalized or normalized and tempered state, the welded joints of the product welded test pieces shall be subject to stricter impact test requirements; the design documents shall select one of the following a) and b). a) The impact test temperature of the welded joint (including the weld and the heat affected zone) shall be in accordance with the design temperature; the impact performance index shall be higher than the minimum requirements specified in Table 1; b) The impact test temperature of the welded joint (including the weld and the heat affected zone) shall be lower than the design temperature; the impact performance index shall be in accordance with the provisions of Table 1. 9.9 For welding materials used for pressure vessels, the high-temperature tensile properties and corrosion resistance (stress corrosion) properties of the deposited metal shall not be lower than the relevant provisions for steel. 9.10 The shielding gas used for welding shall comply with the provisions of GB/T 39255.Appendix A(Normative) Supplementary provisions for steel A.1 General requirements A.1.1 This Appendix is a supplement to the main text of the document and includes the following steels. a) Steels that have been included in this document but not included in the national standard for special steel plates for pressure vessels (pressure-bearing equipment), the industry standard for special forgings, the national standard for steel pipes or the industry standard (except for the steels in 5.1.12); b) Steels that are not included in the main text of this document. A.1.2 The selection of steels that have been included in this document but not included in the national standard for special steel plates for pressure vessels (pressure-bearing equipment), the industry standard for special forgings, the national standard for steel pipes or the industry standard (except for steels that meet the requirements of 4.3) shall comply with the provisions of this Appendix. At the same time, on the basis of completing the test research work, the steel research and development organization shall formulate enterprise standards and make them public to the society in accordance with relevant regulations; provide necessary material data (including chemical composition, tensile properties, fatigue test data, fracture toughness, other corresponding performance parameters that meet the requirements of the scope of use of the material). Steel materials shall be tested and verified by the pressure vessel material (steel plates, forgings)’s type test organization, to prove that various performance indicators can meet the requirements of this Appendix and relevant pressure vessel material standards, before they can be used to manufacture pressure vessels. A.1.3 The selection of foreign designations of steel materials shall comply with the provisions of TSG 21. A.2 Low alloy steel pipe A.2.1 Technical requirements for 08Cr2AlMo steel pipe are as follows. a) The chemical composition (melting analysis) of the steel shall be in accordance with the provisions of Table A.1; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
