Q/BQB 620-2023 English PDFUS$319.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. Q/BQB 620-2023: Low crack susceptibility high strength steel plates for hydropower Q/BQB 620: Historical versions
Basic dataStandard ID: Q/BQB 620-2023 (Q/BQB620-2023)Description (Translated English): Low crack susceptibility high strength steel plates for hydropower Sector / Industry: Chinese Industry Standard Classification of Chinese Standard: QBQ Word Count Estimation: 9,939 Date of Issue: 2023-04-09 Date of Implementation: 2023-07-01 Issuing agency(ies): Baoshan Iron & Steel Co., Ltd. Q/BQB 620-2018: Low crack susceptibility high strength steel plates for hydropower---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Low crack susceptibility high strength steel plates for hydropower release Replace Q/BQB 620-2013 Published on.2018-01-15 2018-04-10 Implementation Low crack sensitivity high strength thick steel plate for hydropower ForewordThis standard is drafted in accordance with the rules given in GB/T 1.1-2009 "Standardization Work Guidelines Part I. Standard Structure and Compilation". This standard refers to GB 19189-2011 "Quenched and Tempered High-strength Steel Plate for Pressure Vessels" and is formulated in conjunction with the actual production situation of Baosteel. This standard replaces Q/BQB 620-2013 "Low crack sensitive high strength thick steel plate for hydropower", the main changes compared with the original standard are as follows. -- Adding references to NB/T 47013.3-2015 in the normative references, adding years for GB/T 2970 and JB/T 4730.3 number; - Increase the delivery status in Table 1; -- Add NB/T 47013.3 to the ultrasonic test. The steel grades included in this standard are low weld crack sensitive steels. This standard was proposed by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This standard is under the jurisdiction of the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This standard was drafted by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. Drafter of this standard. Huang Jinhua The previous versions of the standards replaced by this standard are. Q/BQB 620-2009, Q/BQB 620-2013. Low crack sensitivity high strength thick steel plate for hydropower1 ScopeThis standard specifies the dimensions, shape, technical requirements, inspection and test, marking and inspection of low crack sensitive high strength thick steel plates for hydropower. Test documents, etc. This standard applies to low-weld crack-sensitive high-strength thick steel plates for hydropower produced by Baoshan Iron and Steel Co., Ltd.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 223 steel and alloy chemical analysis method GB/T 228.1-2010 tensile testing of metallic materials - Part 1 GB/T 229 metal material Charpy pendulum impact test method GB/T 232 metal material bending test method GB/T 709-2006 Size, shape, weight and tolerance of hot rolled steel sheets and strips GB/T 2970 thick steel plate ultrasonic inspection method GB/T 2975-1998 Steel and steel products, mechanical properties test, sampling position and sample preparation GB/T 4160 steel strain aging sensitivity test method (Charpy impact method) GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method) GB/T 5313 thickness direction performance steel plate GB/T.20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron GB/T.20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method) GB/T.20125 Determination of multi-element content of low alloy steels by inductively coupled plasma atomic emission spectrometry JB/T 4730.3-2005 Non-destructive testing of pressure equipment - Part 3 NB/T 47013.3-2015 Non-destructive testing of pressure equipment - Part 3 General technical requirements for Q/BQB 600 thick steel plate3 General technical requirementsUnless otherwise specified in this standard, steel plates supplied in accordance with this standard shall comply with the corresponding requirements of Q/BQB 600.4 classification and code4.1 Brand representation The steel grade is represented by the first “B” of the pinyin letter of “Bao” in Baosteel, and the minimum tensile strength (in MPa). The characteristics of the English alphabet, use, delivery status and quality level. In the case of low weld crack sensitivity, use English Crack Free first place The letter "CF", the first letter "H" of Hydropower in hydropower, and the "Q" when the delivery state is in the quenched state, is used for thermomechanical rolling. When the impact toughness is indicated by "M" and the quality grade is required, the letter "L" in "Low temperature" is used, and "2" and "4" are used. And "5" distinguish the -20 ° C, -40 ° C and -50 ° C impact test temperature. 4.2 The grade, delivery status, nominal thickness and use of the steel plate are shown in Table 1. Table 1 Grade a Delivery status Nominal thickness mm Use B610CFHQL2, B780CFHQL2 Q 10～150 Low weld crack sensitive steel for minimum service temperature -20 °C, etc. Hydrometal power station pressure pipe, volute, manifold and other metal components. B610CFHML2, B780CFHML2 TM or TM T 10~60 B610CFHQL4, B780CFHQL4 Q 10～150 Low weld crack sensitive steel for minimum service temperature of -40 °C, etc. Hydrometal power station pressure pipe, volute, manifold and other metal components. B610CFHML4, B780CFHML4 TM or TM T 10～60 B780CFHQL5 Q 10～150 Low weld crack sensitive steel for minimum service temperature of -50 °C, etc. Hydrometal power station pressure pipe, volute, manifold and other metal components. B780CFHML5 TM or TM T 10~60 a When ordering Z-direction performance requirements, add a Z-direction performance level suffix after the grade, for example. B610CFHQL2-Z35.5 Information required for orderingUpon request, the user is required to provide the following information sufficient to indicate the required materials. a) the standard number; b) brand, delivery status; c) specifications and thickness deviation categories; d) edge state; e) ultrasonic testing methods and qualification levels; f) weight and use; g) Others (such as carbon equivalent requirements, impact absorption energy, simulated post-weld heat treatment system and requirements, thickness direction performance level, strain Special requirements such as aging sensitivity requirements). 6 Dimensions, shape, weight and tolerance The size, shape, weight and tolerance of the steel plate shall comply with the provisions of GB/T 709.7 Technical requirements7.1 Brand and chemical composition 7.1.1 The grade and chemical composition of the steel (melting analysis) shall comply with the requirements of Table 2. 7.1.2 The formula for calculating the carbon equivalent and welding crack sensitivity coefficient shall comply with Table 3. 7.1.3 The welding crack sensitivity coefficient of steel plates shall comply with the requirements of Table 4. 7.1.4 According to the requirements of the purchaser, the welding crack sensitivity coefficient (Pcm) in Table 4 can be used as carbon when negotiated by the supplier and the buyer and noted in the contract. Instead of the amount (Ceq), the carbon equivalent (Ceq) of the steel sheet should meet the requirements of Table 5. 7.1.5 The allowable deviation of the chemical composition of the steel plate shall comply with the requirements of Table 2 of GB/T 222. Table 2 Brand thickness Mm Chemical composition a (melting analysis), % C Si Mn PS Cu Ni Cr Mo VB B610CFHQL2 B610CFHQL4 B610CFHML2 B610CFHML4 10~80 ≤0.09 0.40 0.60~ 1.60 0.015 0.007 0.25 ≤0.60 ≤0.30 ≤0.40 0.02~0.06 ≤0.002 >80～150 ≤0.11 ≤1.0 B780CFHQL2 B780CFHML2 B780CFHQL4 B780CFHML4 B780CFHQL5 B780CFHML5 10~80 ≤0.09 0.40 0.60~ 1.60 0.015 0.007 0.40 ≤1.50 ≤0.60 ≤0.60 0.02~ 0.06 ≤0.002 >80～150 ≤0.12 a To improve the properties of steel, other microalloying elements can be added. table 3 Project calculation formula a Carbon equivalent 14 Mo Cr Ni Si MnCeq C Welding crack sensitivity coefficient B510 Mo Cr Ni Cu Mn SiCPcm a Calculate the chemical composition of the formula using the value of the smelting analysis Table 4 Brand Welding crack sensitivity coefficient Pcm,% Thickness, mm 10～60 >60～80 >80～150 B610CFHQL2, B610CFHML2 B610CFHQL4, B610CFHML4 ≤0.20 ≤0.22 ≤0.24 B780CFHQL2, B780CFHML2 B780CFHQL4, B780CFHML4 B780CFHQL5, B780CFHML5 ≤0.24 ≤0.25 ≤0.28 table 5 Brand Carbon equivalent Ceq, % Thickness, mm 10～60 >60～80 >80～150 B610CFHQL2, B610CFHML2 B610CFHQL4, B610CFHML4 ≤0.42 ≤0.44 ≤0.48 B780CFHQL2, B780CFHML2 B780CFHQL4, B780CFHML4 B780CFHQL5, B780CFHML5 ≤0.53 ≤0.54 ≤0.56 7.2 Smelting method The steel is smelted by an oxygen converter and vacuum treated. 7.3 Delivery status 7.3.1 The steel plate is delivered by quenching and tempering, thermomechanical controlled rolling or thermomechanical control rolling and tempering. When delivered in a quenched and tempered state, it is tempered The temperature should not be lower than 600 °C. 7.3.2 If necessary, multiple heat treatments may be performed on the quenched and tempered steel sheet. 7.3.3 Under normal circumstances, the edge state of the steel plate is delivered by shearing or flame cutting. If required by the parties, negotiated by the supplier and the buyer and in the contract It can also be delivered without cutting (flash) when indicated in the middle. 7.4 Mechanics and process performance 7.4.1 The mechanical and process properties of the steel plate are to comply with the requirements of Table 6. 7.4.2 Shock absorption energy is the average of the test results of a group of three samples, allowing the test result of one of the samples to be less than the specified value, but Not less than 70% of the specified value. 7.4.3 The impact test is only applicable to steel plates with a thickness of 6 mm or more. When impact test is carried out on steel plates with a thickness of 12 mm or more, Using 10.0mm × 10.0mm × 55mm standard specimens, the test results should meet the specified values in the table; for thickness greater than or equal to 6mm and less than When the 12.0mm steel plate is subjected to the impact test, an auxiliary sample of 7.5mm × 10.0mm × 55mm or 5.0mm × 10.0mm × 55mm shall be used. The test results are not less than 75% or 50% of the values specified in the table. 7.4.4 If the impact test result does not meet the specified requirements, three additional samples may be taken on the same sampled product for inspection. The test results (average value) of the six samples shall not be less than the specified value, and the sample below the specified value may only have a maximum of two, only allowed One of the values is less than 70% of the specified value. 7.5 Surface quality 7.5.1 Cracks, air bubbles, crusting, folding and inclusions are not allowed on the surface of the steel sheet. If the above defects are present, it is allowed to be cleaned and cleaned deep. The degree shall not exceed half the thickness tolerance of the steel plate from the actual size of the steel plate, and the minimum thickness of the steel plate shall be ensured. Defect cleanup should be smooth edges and corners. Steel plates must not be layered. 7.5.2 Other defects are allowed to exist. However, the depth shall not exceed half the allowable tolerance of the thickness from the actual size of the steel plate, and the defect shall be guaranteed. The thickness does not exceed the minimum thickness allowed for the steel plate. Table 6 Brand thickness Mm Tensile test impact test 180° bending test b=2a (a = sample thickness, b = sample width, D-bend head diameter) Lower yield strength a ReL MPa tensile strength Rm MPa Elongation after break A,%, (L0= 0S.655 ) temperature Shock absorption energy Quantity b KV2, J B610CFHQL2 B610CFHML2 10～75 ≥490 610～740 ≥17 -20 ≥47 D=3a >75～150 ≥470 590～720 B610CFHQL4 B610CFHML4 10～75 ≥490 610～740 ≥17 -40 ≥47 D=3a >75～150 ≥470 590～720 B780CFHQL2 B780CFHML2 10～50 ≥690 780～920 ≥15 -20 ≥47 D=3a >50～150 ≥670 760～900 B780CFHQL4 B780CFHML4 10～50 ≥690 780～920 ≥15 -40 ≥47 D=3a >50～150 ≥670 760～900 B780CFHQL5 B780CFHML5 10～50 ≥690 780～920 ≥15 -50 ≥47 D=3a >50～150 ≥670 760～900 a Rp0.2 is used when the yielding phenomenon is not obvious. b According to the requirements of the purchaser, after the supply and demand sides negotiate and indicate in the contract, the shock absorption energy can be ≥80J or ≥100J. 7.6 Ultrasonic testing The steel plate shall be ultrasonically tested one by one. The detection method may be according to JB/T 4730.3-2005, NB/T 47013.3-2015 or GB/T 2970. Execution, test methods and qualification levels are determined by order. The probe can be selected according to GB/T 2970. 7.7 Special requirements After consultation between the supplier and the buyer, and in the contract, the following special requirements can be made for the steel plate. 7.7.1 Thickness greater than or equal to 15mm The thickness direction performance of the steel plate shall comply with the provisions of GB/T 5313. 7.7.2 The strain aging sensitivity test requires that the sample tensile strain is 5%. 7.7.3 Simulated post-weld heat treatment system and requirements. 7.7.4 Other requirements.8 Inspection and testing8.1 Types of inspection documents shall comply with the provisions of 8.2 to 8.3 when selecting the specified inspection and test. 8.2 The inspection items, the number of samples, the sampling method, the test method and the sampling direction of each batch of steel plates shall comply with the requirements of Table 7. Table 7 Serial number test item Number of samples (a) sampling method b Test method sampling direction 1 Chemical analysis a 1 (per furnace) GB/T.20066 GB/T 223, GB/T 4336, GB/T.20123, GB/T.20125 General method 2 tensile test 1 Thickness ≤ 25mm, GB/T 2975 Figure A10 a (full thickness plate shape) Thickness >25mm~≤50mm, GB/T 2975 Figure A10 a or d Thickness >50mm, GB/T 2975 Figure A10 d (1/4t rod shape) GB/T 228.1 transverse specimen 3 bending test 1 GB/T 2975 (bending specimens should retain at least one rolling surface, The rolled surface is the tensile surface of the bending test) GB/T 232 Transverse sample4 Impact testGroup 1 (3) Thickness ≤ 25mm, GB/T 2975 Figure A11 a (near surface) Thickness >25mm, GB/T 2975 Figure A11 b(1/4t) GB/T 229 Transverse sample 5 Ultrasonic testing one by one - JB/T 4730.3-2005 or NB/T 47013.3-2015 or GB/T 2970 6 thickness direction performance agreement GB/T 5313 GB/T 5313 thickness direction 7 strain aging sensitivity agreement with impact test GB/T 4160 transverse specimen a When arbitrating, the test method adopts GB/T 223. b Allows shearing or flame cutting to cut the blank, but the size of the blank must ensure that the specimen avoids work hardened areas or thermal shadows caused by shear or flame cutting Ring zone. 8.3 sampling frequency 8.3.1 Sampling frequency of chemical composition analysis Melting analysis of chemical components by furnace. 8.3.2 Sampling frequency of mechanical properties and process performance For steel plates delivered in quenched and tempered condition, each batch shall consist of the same heat-treated mother board. Steel plates delivered for thermomechanical rolling, per batch It should consist of a motherboard with the same delivery status. The mechanical properties of the sample should be taken from 1/4 of the width of the steel plate. When the length of the steel plate is less than or equal to 15m, A blank is sampled at one end of the steel sheet, and when the length of the steel sheet is greater than 15 m, the billet is sampled at both ends of the steel sheet. 8.3.3 The negotiation rules may be determined separately by negotiation between the supplier and the buyer. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of Q/BQB 620-2023_English be delivered?Answer: Upon your order, we will start to translate Q/BQB 620-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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