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Q/BQB 600-2023 English PDF

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Q/BQB 600-2023: General technical requirements for steel plates

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Basic data

Standard ID Q/BQB 600-2023 (Q/BQB600-2023)
Description (Translated English) General technical requirements for steel plates
Sector / Industry Chinese Industry Standard
Classification of Chinese Standard QBQ
Word Count Estimation 15,127
Date of Issue 2023-04-09
Date of Implementation 2023-07-01
Issuing agency(ies) Baoshan Iron & Steel Co., Ltd.

Q/BQB 600-2018: General technical requirements for steel plates

---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.
General technical requirements for steel plates release release Replace Q/BQB 600-2013 General technical requirements for thick steel plates Published on.2018-01-15 2018-04-10 Implementation

Foreword

This 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 is based on GB/T 709-2006, EN10029-2010 and ASTM A6M-2017, and is based on the actual production situation of Baosteel. This standard replaces Q/BQB 600-2013 "General Technical Requirements for Thick Steel Plates". The main changes compared with the original standards are as follows. -- The reference to GB/T 14977-2008 has been added to the normative reference documents, and the GB/T 18253 and GB/T 2975 numbers have been added; -- Defining the default mode for surface conditions when ordering non-heat treated steel sheets; -- Increased surface quality by negotiation in accordance with the provisions of GB/T 14977; -- Clear quenching including off-line quenching and in-line quenching; -- Increased length tolerance for lengths above 10000mm; -- Increased the allowable deviation of the unevenness of the non-cut steel plate; -- Strictly tighten the tolerance of ordinary unevenness of steel plates with a width greater than 3000mm; -- The value of the numerical correction is determined by the comparison method. Appendix A of this standard is a normative appendix, and Appendix B is an informative appendix. 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. The drafter of this standard is Huang Jinhua. The previous versions of the standards replaced by this standard are. Q/BQB 600-2004, Q/BQB 600-2009, Q/BQB 600-2013. General technical requirements for thick steel plates

1 Scope

1.1 This standard specifies a set of general technical requirements for thick steel plates, including information required for ordering, smelting methods, delivery status, heat treatment, Chemical analysis, surface, size, shape, weight, additional requirements, inspection and testing, acceptance, numerical repair, marking, inspection documents, etc. 1.2 This standard applies to thick steel plates produced by Baoshan Iron and Steel Co., Ltd., hereinafter referred to as steel plates. 1.3 When the product standard or contract provisions are inconsistent with the provisions of this standard, the product standards and contract provisions shall prevail.

2 Normative references

The 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. Permissible deviation of chemical composition of finished products of GB/T 222 steel GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values GB/T 14977-2008 General requirements for surface quality of hot rolled steel sheets GB/T 18253-2000 Types of inspection documents for steel and steel products GB/T 2975-1998 Steel and steel products, mechanical properties test, sampling position and sample preparation

3 Information required for ordering

3.1 As required, the user shall provide the following information sufficient to indicate the required materials when ordering. a) standard number and brand number; b) specifications and tolerances, weight; c) edge status, delivery status, surface status; d) use, inspection file type; e) Others (eg additional requirements, weld repair requirements, etc.). 3.2 If the thickness tolerance level, edge state and unevenness tolerance level are not specified in the order contract, the thickness tolerance level PT.N, Edge state EC delivery, normal unevenness accuracy level PF.N delivery; when the delivery status is not stated, selected by the supplier; for non-heat treated steel sheets, When the surface state is not specified, it is delivered in a black state. When the inspection file type is not specified, it shall be in accordance with GB/T 18253-2000 Type 5.1B. Note. Inspection file type GB/T 18253-2000 Type 5.1B is equivalent to Type 3.1 in EN 10204-2004.

4 smelting method

Steel is a killed steel smelted by an oxygen converter or an electric furnace.

5 Delivery status

5.1 Steel plates may be delivered by rolling, normalizing rolling, thermomechanically controlled rolling and/or heat treatment unless otherwise specified in the product standard or contract. set. 5.2 When the delivery status of the steel plate is not specified in the product standard or contract, it shall be selected by the supplier. 5.3 The classification and code of the steel plate delivery status are shown in Table 1. Table 1 Classification and code of delivery status of steel plates Delivery status classification code description Rolled AR As-rolled underlined letters uppercase Normalizing rolling or controlled rolling NR or CR Normalized rolling or Control rolling underlined capital letters Thermo-mechanically controlled rolling Thermography Normalizing N Normalizing Underlined letters uppercase Tempered T Tempering Underlined letters uppercase Quenching a tempering (tempering) QT Quenching and tempering underlined capital letters Normalizing and tempering NT Normalizing and tempering Annealing A Annealing Underlined Capital Letters Quenching a Q Quenching underlined capital letters a Quenching Q includes off-line quenching (RQ) and in-line quenching (DQ).

6 heat treatment

6.1 Normally the heat treatment of the steel sheet is carried out by the supplier. 6.2 When the heat treatment of the steel plate is not carried out by the supplier, it shall be indicated in the contract. At this time, the condition for acceptance of the steel plate is. the full thickness of the steel plate is sampled. Heat treatment according to product standards or contract requirements, and processed into samples for testing. If the product standard or contract does not specify heat treatment In the case of the degree, the supplier shall heat-treat the sample as he sees fit and provide the heat treatment system to the demander. 6.3 Unless otherwise specified, the supplier may perform re-heat treatment when the performance is not satisfactory after heat treatment, and the surface of the steel sheet shall be re-treated after heat treatment. Performance is tested.

7 Chemical analysis

7.1 Normally chemical analysis refers to smelting analysis unless specified as a finished product analysis. 7.2 Normally the supplier does not perform a finished product analysis unless otherwise specified. 7.3 The allowable deviation of the chemical composition of the finished steel sheet shall comply with the provisions of GB/T 222 unless otherwise specified.

8 surface

8.1 The surface state of the steel plate is divided into black skin, shot peening, shot peening + painting, the description of which is specified in Table 2. Table 2 Surface state of steel plate Surface state description Black skin indicates that the surface of the steel sheet is a rolled surface. Shot peening indicates shot blasting on the upper and lower surfaces of the steel plate. Shot peening + painting means that the upper and lower surfaces of the steel plate are shot blasted, and the upper and lower surfaces are painted. 8.2 Surface quality 8.2.1 There shall be no defects on the surface of the steel plate that are harmful to use. Unless otherwise specified in the product standard or contract, when the surface of the steel plate exists In the case of a defect, the supplier may remove the defect or repair it by grinding or welding, but the following requirements shall be met. 8.2.1.1 Grinding a) The grinding part of the steel plate should be well processed, and the boundary with the rolling surface should be smooth and angular. b) The thickness of the steel plate after grinding shall be within the allowable deviation of the thickness. 8.2.1.2 Welding repair There are defects on the surface of the steel plate that cannot be cleaned in accordance with 8.2.1.1. Under normal circumstances, the supplier can be repaired after grinding and should be satisfied. The following requirements. a) Use appropriate methods for solder repair. b) There should be good surface quality after welding repair. c) completely remove the harmful defects on the steel plate by leveling or grinding before welding, and remove part of the depth in the steel plate Within 20% of the thickness, the total repair area of one side should be within 2% of the area of the steel plate. d) There must be no undercuts or overlaps on the edges of the welded parts of the steel plate. The stack height should be 1.5mm or more above the rolling surface, and then leveled or smoothed with a shovel Wait for the method to remove the heap height. e) The heat treated steel plate shall be heat treated again after welding repair. f) The minimum tensile strength specified is not less than 690 MPa. The welding repair of the product shall be negotiated between the supplier and the purchaser. 8.2.2 If required by the parties, the supplier shall consult and indicate in the contract that the surface quality may be implemented in accordance with GB/T 14977. At this time as in the contract When category and level are not indicated, it shall be in accordance with Class B, Class 1 of GB/T 14977. 9 Dimensions, shape, weight and tolerance 9.1 Classification and code 9.1.1 According to the edge state Trimming EC Uncut EM 9.1.2 According to the thickness tolerance level. PT.N. symmetrical tolerance; PT.A. The negative deviation is specified according to the nominal thickness; PT.B. Asymmetric tolerance with a negative tolerance of 0.30 mm; PT.C. The fixed negative deviation is 0, and the positive deviation is specified by the nominal thickness. 9.1.3 According to the level of unevenness tolerance. PF.N ordinary unevenness accuracy PF.S higher unevenness accuracy 9.2 size 9.2.1 The nominal size range of steel plates is listed in Table 3. 9.2.2 Recommended nominal size of steel plate 9.2.2.1 Normally, the nominal thickness of the steel plate is any size in the range listed in Table 3 in multiples of 0.5 mm. 9.2.2.2 In general, the nominal width of the steel plate is any size in the range of 50 mm or 10 mm in the range listed in Table 3. 9.2.2.3 In general, the nominal length of the steel plate is any size in the range listed in Table 3 in multiples of 100 mm or 50 mm. Table 3 nominal size range of steel plate Edge state nominal thickness mm nominal width mm nominal steel plate length mm Trimming EC 5 to 400 900～4800 3000~25000 Uncut EM 1300~4800 9.3 Dimensional tolerance 9.3.1 The allowable deviation of the thickness of the steel plate shall comply with the requirements of Table 4. 9.3.2 The allowable deviation of the width of the steel plate shall comply with the requirements of Table 5. 9.3.3 The allowable deviation of the length of the steel plate shall comply with the requirements of Table 6. 9.4 Shape tolerance 9.4.1 The normal unevenness tolerance of the steel plate shall comply with the requirements of Table 7. The higher unevenness precision tolerance of the steel plate shall comply with the requirements of Table 8. 9.4.2 The bending and cutting of the steel plate shall ensure the rectangular shape of the steel plate. 9.4.3 The boring curve of the trimmed steel plate shall comply with the requirements of Table 9. 9.4.4 Degree of deviation of the trimmed steel plate 9.4.4.1 The degree of decoupling of the steel plate (u) can be measured by projection method or by diagonal method. Measured off when measured by projection The squareness (cutting slope) u should be no more than 1% of the actual width of the steel sheet. When measured by the diagonal method, the calculated degree of decoupling (u) should be no greater than steel. 0.7% of the actual width of the board. 9.4.4.2 When a dispute arises, the projection method shall be used for arbitration. 9.4.5 For the bending and decoupling degree of the non-cut steel plate, if required by the purchaser, it can be determined by both the supplier and the buyer at the time of ordering. 9.5 weight When the steel plate is delivered according to the theoretical weight, the thickness of the theoretical weight is the average value of the maximum thickness and the minimum thickness allowed (ie, the nominal thickness) Degree plus thickness added value), width and length are nominal size values. Unless otherwise specified in the product standard, the density of steel is 7.85g/cm3 (ie the basic weight is 7.85kg/(mm.m2)). The theoretical weight calculation method and the thickness added value of each thickness accuracy are shown in Appendix A (normative record). 9.6 Other According to the requirements of the purchaser, the size, shape, weight and allowable deviation may be separately specified after consultation between the supplier and the purchaser and specified in the contract. 10 Additional requirements According to the requirements of the purchaser, after the supply and demand sides negotiate and stipulate in the contract, other inspection items, such as finished product analysis and mechanical test, can be supplemented. Inspection, process test, metallographic examination, non-destructive testing (ultrasonic flaw detection UT, magnetic particle inspection MT, osmosis inspection PT, etc.), welding test, etc. Table 5 Allowable deviation of the width of the steel plate mm Nominal thickness nominal width Width tolerance Trimming without trimming 5.00~16.0 ≤1500 100 Negotiated by the supplier and the buyer at the time of ordering >1500 150 >16.0 < 2000.200 ≥2000～< 3000 250 ≥3000 300 Table 6 The allowable deviation of the length of the steel plate mm Nominal length length tolerance ≤4000 20 >4000～6000 30 >6000～8000 40 >8000 50 Table 7 Ordinary unevenness accuracy tolerance of steel plate mm Nominal thickness Steel type L a steel type Ha The unevenness tolerance (PF.N) of the following nominal width steel plates is not greater than Measuring length b 1000.2000 1000.2000 ≤5 9 14 12 17 >5～8 8 12 11 15 >8～15 7 11 10 14 >15～25 7 10 10 13 >25～40 6 9 9 12 >40～400 5 8 8 11 a Steel L. A steel plate with a specified minimum yield strength value ≤ 460 MPa and which has not been quenched or quenched and tempered. Steel H. The specified minimum yield strength value > 460 MPa to 700 MPa, and all quenched or quenched and tempered steel sheets. b If the distance between the ruler (line) and the contact point of the steel plate is less than 1000mm, the maximum allowable value of the unevenness should meet the following requirements. for steel L, the contact point The distance between the distances (300 to 1000 mm) is 1%; for the steel type H, it is 1.5% of the distance between the contact points (300 to 1000 mm). However, neither shall exceed the requirements of Table 7. Table 8 High unevenness accuracy tolerance of steel plate mm Nominal thickness Steel type L a steel type Ha The unevenness tolerance b (PF.S) of steel plates of different measured lengths is not greater than 1000.2000 1000.2000 ≤5 5 10 7 14 >5～8 5 10 7 13 >8～15 3 6 7 12 >15～25 3 6 7 11 >25～40 3 6 7 11 >40～250 3 6 6 10 >250～400 4 7 7 11 a Steel L. A steel plate with a specified minimum yield strength value ≤ 460 MPa and which has not been quenched or quenched and tempered. Steel H. The specified minimum yield strength value > 460 MPa to 700 MPa, and all quenched or quenched and tempered steel sheets. b If the distance between the ruler (line) and the contact point of the steel plate is less than 1000mm, the maximum allowable value of the unevenness should meet the following requirements. for steel L, the contact point The distance between the distances (300 to 1000 mm) is 0.5%; for the steel type H, it is 1% of the distance between the contact points (300 to 1000 mm). However, neither shall exceed the requirements of Table 8. Table 9 File bending of trimmed steel plate mm Sickle bend allows maximum measurement length ≤0.2%× actual length actual length 11 Inspection and testing 11.1 The appearance of the steel plate is checked visually. 11.2 Measurement of the dimensions and shape of the steel plate shall be carried out using suitable measuring tools. 11.2.1 Measurement of thickness The thickness measurement portion of the trimmed steel plate is any point 25 mm or more from the lateral or longitudinal side of the steel plate. For the non-cut steel plate, the measurement part should be set When the goods are agreed. 11.2.2 Width measurement The width should be measured in an orientation perpendicular to the centerline of the steel plate. 11.2.3 Measurement of length The length of the largest rectangle in the steel plate. 11.2.4 Measurement of unevenness The steel plate is placed freely on the platform and no pressure is applied except for the weight of the steel plate itself. Use a length of 1000mm or.2000mm Ruler measurement. For trimmed steel plates, the ordinary unevenness accuracy is at least 25 mm from the longitudinal side of the steel plate and at least.200 mm from the lateral side. Measure the maximum distance between the upper surface of the steel plate and the ruler in any direction; the accuracy of the higher unevenness is at least 25 mm and distance from the longitudinal side of the steel plate. The maximum distance between the upper surface of the steel plate and the ruler is measured in any direction within the area of at least 100 mm. For non-cut steel plates, ordinary The accuracy of the unevenness is measured in any direction within a region of at least 50 mm from the longitudinal side of the steel sheet and at least.200 mm from the lateral side of the steel sheet. The maximum distance between the rulers; the accuracy of the higher unevenness is at least 50 mm from the longitudinal side of the steel plate and at least 100 mm from the lateral edge Direction, measure the maximum distance between the upper surface of the steel plate and the ruler. As shown in Figure 1. figure 1 11.2.5 Measurement of sickle bend The maximum distance between the concave side of the steel plate and the line connecting the ends of the measuring portion is shown in Fig. 2. 11.2.6 Measurement of the skew (departition) The vertical projection of the transverse edge of the steel plate on the longitudinal side (as shown in Figure 2) or one-half the difference between the diagonals of the steel plate. figure 2 11.3 The number of samples for testing, sampling methods, and test methods. 11.3.1 For the thickness of the steel plate not more than 40mm, the impact sample position shall be in accordance with GB/T 2975 Figure A11a) (near surface); for steel plate thickness When the degree is greater than 40mm, the impact sample position is in accordance with GB/T 2975 Figure A11b) (1/4t). 11.3.2 The quantity, sampling method and test method of other test samples shall comply with the provisions of the corresponding product standards. 12 Acceptance 12.1 Steel plates shall be inspected and accepted in batches, and the rules for group approval shall comply with the provisions of the corresponding product standards. 12.2 When there is a non-compliance with the test results, the test may be re-examined or the whole may be criticized as unqualified. 12.3 Re-inspection 12.3.1 During the re-inspection, a double number of samples shall be taken from the same batch for the re-inspection of the unqualified item. 12.3.2 The results of the re-inspection (including all the indicators required for the test of the project) are qualified, and the whole batch is qualified. Retest results (including the project test All indicators required by the inspection) Even if one indicator fails, the whole batch is unqualified. Oblique Rolling direction Rolling direction E C. Mm EM Mm PF.N..200mm PF.S. 100mm 12.4 Reclassification and Rework Unqualified steel plates before or after re-inspection can be reclassified and reworked as follows. a) The single steel plate that has been tested and the test results are not acceptable cannot be accepted, but the untested steel plate in the batch can be resubmitted one by one. Inspection and acceptance. b) Re-heat treatment of the unqualified steel plates, and then re-submit the test and acceptance. 13 numerical repair The numerical judgment uses the comparison value comparison method, and the numerical correction should conform to the provisions of GB/T 8170. 14 signs 14.1 The steel plate markings should be clear. 14.2 Under normal circumstances, steel plates are delivered in single sheets. Each steel plate shall be printed or engraved with the supplier's trademark, standard number, grade, furnace number, size, Steel plate number, weight, special requirements symbol and other signs. 15 Inspection documents 15.1 The steel plate for each batch of delivery must be inspected. The inspection documents should be marked as required. supplier name and trademark, order and receipt Position, contract number, product name, standard number and grade, delivery status, size specification, furnace number, steel plate number, delivery weight, standard The results of various tests, the date of issuance, and the signature of the person in charge of the quality management department. 15.2 The type of inspection documents shall comply with the provisions of GB/T 18253. 16 other Appendix B (informative) provides information on the weldability of steel.

Appendix A

(normative appendix) Weight calculation method for theoretical weighing and thickness added value for each thickness accuracy A.1 The weight calculation method for theoretical weighing shall comply with the provisions of Table A.1. Table A.1 Weight calculation method for theoretical weighting Computational calculation method results Basic weight kg/(mm.m2) 7.85 (thickness 1mm, area 1m2 weight) ― Unit weight kg/ m2 Basic weight kg/(mm.m2)×thickness (mm) Rounded to four significant figures Steel plate area m2 width (m) × length (m) rounded to four significant figures The weight of one steel plate kg unit weight (kg/m2) × steel plate area (m2) is rounded to three significant figures, when more than 1000kg, Trim to an integer number of kg. Total weight kg The sum of the weights of each steel plate is rounded to the integer of kg A.2 The thickness-added values for each thickness accuracy in theoretical weighing shall be in accordance with Table A.2.

Appendix B

(informative appendix) Steel weldability B.1 The weldability of steel refers to the steel under the traditional welding method (such as manual arc welding, submerged arc welding, gas metal arc welding, non-melting gas) Protective welding, electric resistance welding, plasma arc welding, electron beam welding, laser welding, etc.), the relative difficulty of steel being welded. B.2 During the thermal cycle of welding, some brittle undesirable microstructures may be formed in the weld and the base metal, resulting in brittleness of the weld and base metal. Sexual cracking. For steel, the most important welding problem is cold cracking. B.3 The cold crack sensitivity of steel is often referred to as hardenability. Hardenability can be measured by a number of methods. The most common method is the carbon equivalent method. B.4 Carbon is the most important hardenable element in steel. The carbon equivalent is calculated by the carbon content of the steel and the main alloying elements (such as manganese, vanadium, etc.). The effect of hardenability is calculated by converting the corresponding carbon content. B.5 The most commonly used carbon equivalent formula is the carbon equivalent formula of the International Welding Society (IIW). A large number of production practices have proved that it is suitable for Most commonly used carbon-manganese steels and low-alloy steels. The calculation method of carbon equivalent, wherein the mass percentage of the chemical component is based on the result of the smelting analysis. CuNi VMoCr MnCeq C % B.6 For low carbon steel and low alloy steel, when steel is mainly strengthened by microalloying and heat treatment, other formulas can be used to judge more accurately. Hardenability and cold crack sensitivity of steel B.7 For most common structural steels, it is not necessary to specify the maximum limit of carbon equivalent. However, in certain circumstances, users can specify carbon when The maximum amount of t...

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