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Q/BQB 301-2023 English PDF (QBQB301-2019, QBQB301-2018)
Q/BQB 301-2023_English: PDF (Q/BQB301-2023)
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Q/BQB 301-2023
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Dimension, shape, weight and tolerances for continuously hot-rolled steel sheet and strip
Q/BQB 301-2023
Q/BQB 301-2019
English
165
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Hot-rolled steel sheets and strips - Dimensions, shape, weight and tolerances
Q/BQB 301-2019
Q/BQB 301-2018
English
250
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Hot-rolled steel sheets and strips - Dimensions, shape, weight and tolerances
Q/BQB 301-2018
Q/BQB 301-2009
English
170
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Hot-rolled steel sheets and strips - Dimensions, shape, weight and tolerances
Obsolete
Q/BQB 301-2009
BASIC DATA
Standard ID
Q/BQB 301-2023 (Q/BQB301-2023)
Description (Translated English)
Dimension, shape, weight and tolerances for continuously hot-rolled steel sheet and strip
Sector / Industry
Chinese Industry Standard
Classification of Chinese Standard
QBQ
Word Count Estimation
12,140
Date of Issue
2023-04-09
Date of Implementation
2023-07-01
Q/BQB 301-2023 BQB ENTERPRISE STANDARD OF BAOSHAN IRON AND STEEL CO., LTD Replacing Q/BQB 301-2019 Dimension, Shape, Weight and Tolerances for Continuously Hot-Rolled Steel Sheet and Strip ISSUED ON: APRIL 9, 2023 IMPLEMENTED ON: JULY 1, 2023 Issued by: Baoshan Iron and Steel Co., Ltd. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 4 4 Classification and Code ... 4 5 Dimensions ... 5 6 Tolerance of Size ... 6 7 Shape ... 10 8 Measurement of Size and Shape ... 12 9 Weight ... 13 10 Numerical Rounding Rules ... 13 Appendix A (Normative) Weight Calculation Method by Theoretical Weight ... 15 Dimension, Shape, Weight and Tolerances for Continuously Hot-Rolled Steel Sheet and Strip 1 Scope This Document specifies dimension, shape, weight and tolerances for continuously hot-rolled steel sheet and strip. This Document applies to hot-rolled steel strips produced by Baoshan Iron and Steel Co., Ltd., as well as steel sheets transversely cut from steel strips and longitudinally cut steel strips, hereinafter referred to as steel sheets and steel strips. 2 Normative References The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 709 Dimensions, shape, weight and tolerances for hot rolled steel sheets and strips GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values 3 Terms and Definitions For the purposes of this Document, the terms and definitions given in GB/T 709 apply. 4 Classification and Code 4.1 It can be classified as follows according to the edge state: a) Edge-cutting, EC; b) Edge-milling, EM. 4.2 It can be classified as follows according to the thickness precision: a) Ordinary thickness precision, PT.A; b) Higher thickness precision, PT.B; c) Advanced thickness precision, PT.C. 4.3 For the edge-milling steel sheets and strips, which can be classified as follows according to the width precision: a) Ordinary width precision, PW.A; b) Higher width precision, PW.B. 4.4 For steel sheets, which can be classified according to the unevenness precision: a) Ordinary unevenness precision, PF.A; b) Higher unevenness precision, PF.B. 4.5 It can be classified as follows according to the surface treatment method: a) Pickled surface; b) Rolled surface. 4.6 It can be classified as follows according to the product category: a) Hot-rolled steel strip; b) Hot-rolled steel sheet; c) Hot-rolled and heat-treated steel sheets; d) Hot-rolled flat steel strip; e) Hot-rolled slit steel strip; f) Hot-rolled pickled steel strip; g) Hot-rolled pickled steel sheet. 5 Dimensions 5.1 The nominal size ranges of steel sheets and strips are listed in Table 1. 5.2 Normally, the recommended nominal width of slit steel strip is any size in multiples of 20mm within the range listed in Table 1. 8.3 Unevenness 8.3.1 Unevenness of steel sheet Place the steel sheet freely on the platform, without applying any pressure except the weight of the steel sheet itself, and measure the maximum distance between the lower surface of the steel sheet and the plane, as shown in Figure 1. 8.3.2 Unevenness of hot-rolled flat steel strips Place the measuring part of the steel strip freely on the platform, without applying any pressure except the weight of the measuring part of the steel strip. Use a ruler with a length of 1000mm, in the longitudinal direction within an area no less than 40mm from the longitudinal edge of the steel strip, to measure the maximum distance between the upper surface of the steel strip and the ruler. 8.4 Cambering The maximum distance between the concave side of the steel sheet or strip and the straight line connecting the two end points of the measuring part, as shown in Figure 2. For steel sheets with a length L< 5000mm, the measured length of the steel sheet is the actual length; for steel sheets with a length L≥5000mm, the measured length of the steel sheet is any 5000mm. 8.5 Out-of-squareness degree (beveling) The vertical projection of the transverse edge of the steel sheet on the longitudinal edge (as shown in Figure 3); or one-half the difference between the diagonals of the steel sheet. 9 Weight 9.1 Steel sheets are delivered according to theoretical or actual weight; and steel strips are delivered according to actual weight. 9.2 When the steel plate is delivered according to the theoretical weight, the thickness used in the theoretical weight calculation is the average of the allowable maximum thickness and the allowable minimum thickness; and the width and length adopt the nominal size values. Unless otherwise specified in the product standard, the density is 7.85g/cm3. The theoretical weight calculation method is shown in Appendix A (Normative). 9.3 The weight of different categories of products shall comply with the provisions of Table 14. 10 Numerical Rounding Rules The numerical judgment adopts the rounding value comparison method, and the numerical
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Q/BQB 301-2019 ENTERPRISE STANDARD OF BAOSHAN IRON AND STEEL CO., LTD Replacing Q/BQB 301-2018 Dimension, Shape, Weight and Tolerances for Continuously Hot-Rolled Steel Sheet and Strip ISSUED ON: FEBRUARY 02, 2019 IMPLEMENTED ON: APRIL 10, 2019 Issued by: Baoshan Iron and Steel Co., Ltd. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Classification and Code ... 4 4 Dimension ... 5 5 Dimension Tolerance ... 6 6 Appearance ... 9 7 Measurement of Dimension and Appearance ... 12 8 Weight ... 13 9 Numerical Rounding-Off Rules ... 13 Appendix A (Normative) Weight Calculation Method by Taking Theoretical Weight ... 15 Foreword This Standard was drafted as per the rules specified in GB/T 1.1-2009 Directives for Standardization – Part 1: Structure and Drafting of Standards. This Standard was formulated by reference of GB/T 709-2018, EN 10051:2010 and ISO 16160:2012, and combined with the actual situation of the Baoshan Iron and Steel Co., Ltd. This Standard replaced Q/BQB 301-2018. Compared with Q/BQB 301-2018, this Standard has the major changes as follows: --- Extend the maximum width of the steel sheet to 2130mm in Table 1; --- For the thickness precision, width precision and unevenness precision, add the provisions that the ordinary precision shall prevail to supply the products, when the precisions are not specified in the product standard and contract; --- Extend the weight of the hot-rolled pickled steel sheet strip to no less than 28000kg in Table 14. The Appendix A of this Standard is normative. This Standard was proposed by the Manufacture and Management Department of Baoshan Iron and Steel Co., Ltd. This Standard shall be under the jurisdiction of the Manufacture and Management Department of Baoshan Iron and Steel Co., Ltd. Drafting organization of this Standard: Manufacture and Management Department of Baoshan Iron and Steel Co., Ltd. Drafting staff of this Standard: Huang Jinhua, and Liu Meihong. The historical editions replaced by this Standard are as follows: Q/BQB 301-1989, Q/BQB 301-1994, Q/BQB 301-1999, Q/BQB 301-2003, Q/BQB 301-2009, Q/BQB 301- 2014, Q/BQB 301-2018. Dimension, Shape, Weight and Tolerances for Continuously Hot-Rolled Steel Sheet and Strip 1 Scope This Standard specifies the dimension, shape, weight and tolerance of continuously hot-rolled steel sheet and strip. This Standard is applicable to the continuously hot-rolled steel strip produced by Baoshan Iron and Steel Co., Ltd.; as well as the steel sheet horizontally cut from the steel strip and the longitudinally cut steel strip, hereinafter referred to as steel sheet and strip. 2 Normative References The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values 3 Classification and Code 3.1 It can be divided as follows according to the edge state: Trimming EC Non-trimming EM 3.2 It can be divided as follows according to the thickness precision: Ordinary thickness precision PT.A Higher thickness precision PT.B Advanced thickness precision PT.C 3.3 For the non-trimming steel sheet and strip, it can be divided as follows 1000mm in the longitudinal direction of the area no less than 40mm from the longitudinal edge of the steel strip to measure the maximum distance between the upper surface of the steel strip and the ruler. 7.4 Sickle curvature The maximum distance BETWEEN the concave side of the steel sheet and strip AND the straight line connecting the two ends of the measurement part, as shown in Figure 2. For the steel sheet with length L < 5000mm, the measurement length of the steel sheet is the actual length. For the steel sheet with length L ≥ 5000mm, the measurement length of the steel sheet is any 5000mm. 7.5 Out-of-squareness (slanting) The vertical projection of the horizontal edge of the steel sheet on the longitudinal edge (as shown in Figure 3); or one-half of the difference between the diagonals of the steel sheet. 8 Weight 8.1 The steel sheet is delivered according to the theoretical or actual weight; while the steel strip shall be delivered according to the actual weight. 8.2 When the steel sheet is delivered by the theoretical weight, the thickness used in the theoretical weight calculation shall be the average between the allowed maximum and minimum thickness; while the width and length shall take the nominal dimensions. Unless otherwise is specified in the product standard, the density shall be 7.85g/cm3. The theoretical weight calculation method is shown in Appendix A (Normative). 8.3 The weight of different types of products shall meet the provisions of Table 14. 9 Numerical Rounding-Off Rules The numerical judgment is based on rounding-off comparison method. The numerical rounding-off shall conform to the provisions of GB/T 8170.
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Q/BQB 301-2018 ENTERPRISE STANDARD OF BAOSHAN IRON AND STEEL CO., LTD Replacing Q/BQB 301-2014 Dimension, Shape, Weight and Tolerances for Continuously Hot-Rolled Steel Sheet and Strip ISSUED ON: JANUARY 15, 2018 IMPLEMENTED ON: APRIL 10, 2018 Issued by: Baoshan Iron and Steel Co., Ltd. Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Classification and Code ... 5 4 Dimension ... 6 5 Dimension Tolerance ... 7 6 Appearance ... 10 7 Measurement of Dimension and Appearance ... 13 8 Weight ... 14 9 Numerical Rounding-Off Rules ... 14 Appendix A (Normative) Weight Calculation Method by Taking Theoretical Weight ... 16 Foreword This Standard was drafted as per the rules specified in GB/T 1.1-2009 Directives for Standardization – Part 1: Structure and Drafting of Standards. This Standard was formulated by reference of GB/T 709-2006, EN 10051:2010 and ISO 16160:2012, and combined with the actual situation of the Baoshan Iron and Steel Co., Ltd. This Standard replaced Q/BQB 301-2014. Compared with Q/BQB 301-2014, this Standard has the major changes as follows: --- Add the classification, code and corresponding provisions of advanced precision of thickness of PT.C, higher width precision without edge trimming of PW.B, and the higher unevenness precision of steel sheet of PF.B; --- Add product types and nominal size ranges of hot-rolled heat-treated steel sheets and hot-rolled flat strips; --- Extend the maximum width of steel strip in Table 1 to 2100mm; and the maximum nominal thickness of the pickled surface to 8.0mm; --- Add provisions for the total length of the tongue and the fish tail of the steel strips without cutting the head and tail; --- Increase the thickness tolerance to 360MPa in shifts according to the specified minimum yield strength of 345MPa; --- Add the provisions of the asymmetric thickness tolerance that can be specified; --- Tighten the ordinary accuracy of the unevenness of the steel sheet with a specified minimum yield strength greater than 300MPa and thickness no greater than 2mm; --- Add the provisions and measurement methods of the unevenness tolerance of the hot-rolled flat steel strips; --- Add the provisions of the unevenness of the steel strips that are not flattened; --- Tighten the tower-shaped provisions of the finished non-trimming hot-rolled steel strips; --- Tighten the provisions of out-of-squareness when using diagonal measurement; and add the arbitration method in case of the disputes. Dimension, Shape, Weight and Tolerances for Continuously Hot-Rolled Steel Sheet and Strip 1 Scope This Standard specifies the dimension, shape, weight and tolerance of continuously hot-rolled steel sheet and strip. This Standard is applicable to the continuously hot-rolled steel strip produced by Baoshan Iron and Steel Co., Ltd.; as well as the steel sheet horizontally cut from the steel strip and the longitudinally cut steel strip, hereinafter referred to as steel sheet and strip. 2 Normative References The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values 3 Classification and Code 3.1 It can be divided as follows according to the edge state: Trimming EC Non-trimming EM 3.2 It can be divided as follows according to the thickness precision: Ordinary thickness precision PT.A Higher thickness precision PT.B Advanced thickness precision PT.C 3.3 For the non-trimming steel sheet and strip, it can be divided as follows 1000mm in the longitudinal direction of the area no less than 40mm from the longitudinal edge of the steel strip to measure the maximum distance between the upper surface of the steel strip and the ruler. 7.4 Sickle curvature The maximum distance BETWEEN the concave side of the steel sheet and strip AND the straight line connecting the two ends of the measurement part, as shown in Figure 2. For the steel sheet with length L < 5000mm, the measurement length of the steel sheet is the actual length. For the steel sheet with length L ≥ 5000mm, the measurement length of the steel sheet is any 5000mm. 7.5 Out-of-squareness (slanting) The vertical projection of the horizontal edge of the steel sheet on the longitudinal edge (as shown in Figure 3); or one-half of the difference between the diagonals of the steel sheet. 8 Weight 8.1 The steel sheet is delivered according to the theoretical or actual weight; while the steel strip shall be delivered according to the actual weight. 8.2 When the steel sheet is delivered by the theoretical weight, the thickness used in the theoretical weight calculation shall be the average between the allowed maximum and minimum thickness; while the width and length shall take the nominal dimensions. Unless otherwise is specified in the product standard, the density shall be 7.85g/cm3. The theoretical weight calculation method is shown in Appendix A (Normative). 8.3 The weight of different types of products shall meet the provisions of Table 14. 9 Numerical Rounding-Off Rules The numerical judgment is based on rounding-off comparison method. The numerical rounding-off shall conform to the provisions of GB/T 8170.
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