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Q/BQB 401-2023 English PDF

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Q/BQB 401-2023: Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip

Q/BQB 401: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
Q/BQB 401-2023389 Add to Cart 3 days Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip  
Q/BQB 401-2019330 Add to Cart Auto, < 3 mins Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip
Q/BQB 401-2018290 Add to Cart Auto, < 3 mins Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip Obsolete
Q/BQB 401-2014225 Add to Cart Auto, < 3 mins Cold rolled steel sheet and strip - Size, shape, weight and permissible deviations Obsolete
Q/BQB 401-2009249 Add to Cart 3 days Cold rolled steel sheets and strip - Dimensions, shape, weight and tolerances Obsolete

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Basic data

Standard ID: Q/BQB 401-2023 (Q/BQB401-2023)
Description (Translated English): Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip
Sector / Industry: Chinese Industry Standard
Classification of Chinese Standard: QBQ
Word Count Estimation: 11,150
Date of Issue: 2023-04-09
Date of Implementation: 2023-07-01
Issuing agency(ies): Baoshan Iron & Steel Co., Ltd.

Q/BQB 401-2019: Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip

---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.
Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip Q/BQB 401-2019 Replaces Q/BQB 401-2018 Cold rolled steel plate and strip size, shape and weight And allowable deviation Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip 2019-02-02 released 2019-04-10 Implementation release

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1. Structure and Compilation of Standards". This standard was prepared with reference to EN 10131..2006, EN 10143..2006, and JIS G 3141..2017. This standard replaces Q/BQB 401-2018. Compared with Q/BQB 401-2018, this standard has been modified as follows. -Revised the lower limit of the nominal width of product supply from 700mm to 600mm; --- Revised the description of the definition of thickness tolerance 5.1; -Revised the PT.C thickness allowable deviation of 260 ～ < 360MPa, the lower limit of the minimum nominal thickness of the strength file, from 0.20mm to 0.30mm; -The original table 7 width tolerance table of steel strip was revised to separately specify the width accuracy requirements of uncut products, increasing the PW.W basic accuracy control System requirements -Added Table 8, which separately specifies the technical requirements for the width tolerance of the trimmed products; --- Revised Table 9 (original Table 8) Nominal thickness binning and tolerance technical requirements for slitting steel strip width tolerance; --- Revised description of 6.2 sickle-bend control requirements, supplemented the sickle-bend control requirements for slitting steel strips; -Revised the nominal width binning and corresponding index requirements for unevenness in Table 11 (original Table 10); -Added the unevenness illustration of the steel plate (see Figure 1). Appendix A of this standard is a normative appendix. This standard is proposed by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This standard is under the jurisdiction of Baoshan Iron & Steel Manufacturing Co., Ltd. This standard was drafted by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. The drafters of this standard revision. Yuan Min, Hu Ling, Wei Haili. The previous versions replaced by this standard are. Q/BQB 401-1988, Q/BQB 401-1994, Q/BQB 401-1999, Q/BQB 401-2003, Q/BQB 401-2009, Q/BQB 401-2014, Q/BQB 401-2018. Cold rolled steel plate and strip size, shape, weight and tolerance

1 Scope

This standard specifies the requirements for classification and code, size, shape, weight and allowable deviations of cold-rolled steel plates and strips. This standard applies to Baoshan Iron and Steel Co., Ltd. with a thickness of 0.17mm to 3.50mm and a rolling width of 600mm to 2080mm. The cold-rolled steel strip and the steel plate transversely cut and the steel strip longitudinally cut are hereinafter referred to as steel plate and steel strip. Note. The cold rolled products referred to in this standard include cold rolled uncoated products and cold rolled coated products.

2 Normative references

The following documents are essential for the application of this standard. For dated references, only the dated version applies to this document. standard. For undated references, the latest version (including all amendments) is applicable to this standard. GB/T 8170-2008 Numerical rounding rules and expression and judgment of limit values

3 Classification and code

According to different product forms, the classification and code of the edge state and dimensional accuracy of steel plates and strips should meet the requirements of Table 1. Table 1 product form Classification and code Edge state thickness accuracy width accuracy length accuracy unevenness accuracy ordinary advanced super advanced basic ordinary advanced ordinary advanced ordinary advanced ultra advanced Steel strip without cutting edge EM PT.A PT.B PT.C PW.W PW.A ------ Trimming EC-PW.B----- Steel plate without trimming EM PW.W-PL.A PL.B PF.A PF.B PF.C trimming EC-PW.B Slit Strip trimming EC-PW.B-----

4 size

4.1 The available size range of steel plates and strips shall comply with the requirements in Table 2. Table 2 Unit. mm Product shape edge state nominal thickness nominal width nominal length (or nominal inner diameter) Steel plate trimming (EC) 0.30 ～ 3.50 600 ～ 2040 Nominal length. 1000 ～ 6000 Nominal diameter. 610 or 508 Uncut Edge (EM) 630 ～ 2080 Steel strip trimming (EC) 0.17 ～ 3.50 600 ～ 2040 without trimming (EM) 630 ～ 2080 Longitudinal cutting edge (EC) 0.30 ～ 3.50.200 ～ < 900 4.2 Recommended Nominal Size 4.2.1 The recommended nominal thickness of steel plates and strips shall meet the requirements in Table 3. 4.2.2 The recommended nominal widths of steel plates and strips can be in accordance with the widths listed in Table 2. Within the range of available widths, generally the grade is 5mm. 4.2.3 The recommended nominal length of the steel plate may be in accordance with the nominal lengths listed in Table 2, and within the range of available lengths, it shall be graded by 50mm. Table 3 Unit. mm Recommended nominal thickness 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.10 1.20 1.40 1.50 1.60 1.7 1.75 1.80 1.9 2.00 2.30 2.50 2.80 3.00 3.20 3.50

5 Dimensional tolerance

5.1 Thickness tolerance 5.1.1 The allowable deviation of the thickness of steel plates and strips shall comply with the requirements of Table 4. For the longitudinal cut of steel strips, the allowable deviation of the thickness shall be as before Provision of steel strip. If users have higher requirements for thickness accuracy, they can also order according to the PT.C super advanced thickness accuracy given in Table 5. 5.1.2 With the consent of both the supply and demand parties, users with special requirements on thickness accuracy can also order with asymmetric tolerances. 5.1.2.1 PT.AQ mode. The target thickness of the steel plate and strip is the original nominal thickness minus 2%, and the allowable deviation of the positive thickness is the positive of the original nominal thickness. The allowable deviation is reduced by 2% of the original nominal thickness. The negative allowable deviation of thickness is controlled according to the PT.A requirements of the original nominal thickness in Table 4. 5.1.2.2 PT.AD mode. only for steel plates and strips with a specified minimum yield strength of less than 260 MPa, the positive tolerance of thickness is 0, The negative allowable deviation is controlled in accordance with the nominal thickness PT.A requirements in Table 4. 5.1.2.3 If the user has other special thickness accuracy requirements, they can be negotiated when ordering. 5.1.3 When in the PT.C, PT.AQ and PT.AD ordering mode, the thickness of the total length of both ends of the steel strip is 30m (within 15m on one side) The allowable difference is more than 20% of the specified value. 5.1.4 For steel strips delivered with welding seams, the thickness tolerance within a range of 10m near the welding seams may exceed 50% of the specified value. 5.1.5 For hot-dip products whose total weight of double-sided coating is not less than 450g/m2, the allowable thickness deviation shall be increased by ± 0.01mm. Table 4 Unit. mm Prescribed minimum Yield Strength MPa Nominal thickness Thickness tolerance Normal accuracy (PT.A) Advanced accuracy (PT.B) Nominal width Nominal width ≤1200 ＞ 1200 ～ 1500 ＞ 1500 ≤1200 ＞ 1200 ～ 1500 ＞ 1500 < 260 0.17 ～ 0.30 ± 0.02 ± 0.025-± 0.015 ± 0.020- ＞ 0.30 ～ 0.40 ± 0.03 ± 0.03 ± 0.04 ± 0.020 ± 0.025 ± 0.030 ＞ 0.40 ～ 0.60 ± 0.03 ± 0.04 ± 0.04 ± 0.025 ± 0.030 ± 0.035 ＞ 0.60 ～ 0.80 ± 0.04 ± 0.04 ± 0.05 ± 0.025 ± 0.030 ± 0.035 ＞ 0.80 ～ 1.00 ± 0.05 ± 0.06 ± 0.06 ± 0.030 ± 0.035 ± 0.040 ＞ 1.00 ～ 1.20 ± 0.06 ± 0.06 ± 0.07 ± 0.035 ± 0.040 ± 0.050 ＞ 1.20 ～ 1.60 ± 0.08 ± 0.08 ± 0.09 ± 0.040 ± 0.050 ± 0.060 ＞ 1.60 ～ 2.00 ± 0.09 ± 0.10 ± 0.11 ± 0.050 ± 0.060 ± 0.070 ＞ 2.00 ～ 2.50 ± 0.11 ± 0.12 ± 0.13 ± 0.070 ± 0.080 ± 0.090 ＞ 2.50 ～ 3.00 ± 0.13 ± 0.13 ± 0.15 ± 0.090 ± 0.100 ± 0.110 ＞ 3.00 ～ 3.50 ± 0.15 ± 0.17 ± 0.17 ± 0.120 ± 0.130 ± 0.130 260 ～ ＜ 360 0.30 ～ 0.40 ± 0.03 ± 0.04 ± 0.05 ± 0.025 ± 0.030 ± 0.035 ＞ 0.40 ～ 0.60 ± 0.04 ± 0.05 ± 0.05 ± 0.030 ± 0.035 ± 0.040 ＞ 0.60 ～ 0.80 ± 0.04 ± 0.05 ± 0.06 ± 0.030 ± 0.035 ± 0.045 ＞ 0.80 ～ 1.00 ± 0.05 ± 0.06 ± 0.07 ± 0.035 ± 0.040 ± 0.050 ＞ 1.00 ～ 1.20 ± 0.06 ± 0.07 ± 0.08 ± 0.040 ± 0.050 ± 0.060 ＞ 1.20 ～ 1.60 ± 0.08 ± 0.10 ± 0.11 ± 0.050 ± 0.060 ± 0.070 ＞ 1.60 ～ 2.00 ± 0.11 ± 0.12 ± 0.13 ± 0.060 ± 0.070 ± 0.090 ＞ 2.00 ～ 2.50 ± 0.13 ± 0.14 ± 0.15 ± 0.090 ± 0.100 ± 0.110 ＞ 2.50 ～ 3.00 ± 0.15 ± 0.16 ± 0.17 ± 0.110 ± 0.120 ± 0.130 ＞ 3.00 ～ 3.50 ± 0.18 ± 0.21 ± 0.21 ± 0.150 ± 0.160 ± 0.160 Table 4 (continued) Unit. mm Prescribed minimum Yield Strength MPa Nominal thickness Thickness tolerance Normal accuracy (PT.A) Advanced accuracy (PT.B) Nominal width Nominal width ≤1200 ＞ 1200 ～ 1500 ＞ 1500 ≤1200 ＞ 1200 ～ 1500 ＞ 1500 360 ～ 420 0.30 ～ 0.40 ± 0.04 ± 0.05 ± 0.05 ± 0.030 ± 0.035 ± 0.040 ＞ 0.40 ～ 0.60 ± 0.05 ± 0.05 ± 0.06 ± 0.035 ± 0.040 ± 0.050 ＞ 0.60 ～ 0.80 ± 0.05 ± 0.06 ± 0.07 ± 0.040 ± 0.050 ± 0.055 ＞ 0.80 ～ 1.00 ± 0.06 ± 0.07 ± 0.08 ± 0.050 ± 0.055 ± 0.060 ＞ 1.00 ～ 1.20 ± 0.08 ± 0.09 ± 0.10 ± 0.055 ± 0.065 ± 0.070 ＞ 1.20 ～ 1.60 ± 0.10 ± 0.11 ± 0.12 ± 0.070 ± 0.075 ± 0.090 ＞ 1.60 ～ 2.00 ± 0.13 ± 0.14 ± 0.15 ± 0.080 ± 0.090 ± 0.100 ＞ 2.00 ～ 2.50 ± 0.15 ± 0.16 ± 0.17 ± 0.100 ± 0.110 ± 0.120 ＞ 2.50 ～ 3.00 ± 0.17 ± 0.18 ± 0.19 ± 0.120 ± 0.130 ± 0.140 ＞ 3.00 ～ 3.50 ± 0.22 ± 0.25 ± 0.25 ± 0.190 ± 0.200 ± 0.200 ＞ 420 0.30 ～ 0.40 ± 0.05 ± 0.06 ± 0.07 ± 0.035 ± 0.040 ± 0.050 ＞ 0.40 ～ 0.60 ± 0.06 ± 0.06 ± 0.07 ± 0.040 ± 0.050 ± 0.060 ＞ 0.60 ～ 0.80 ± 0.06 ± 0.07 ± 0.09 ± 0.050 ± 0.060 ± 0.070 ＞ 0.80 ～ 1.00 ± 0.08 ± 0.09 ± 0.10 ± 0.060 ± 0.070 ± 0.080 ＞ 1.00 ～ 1.20 ± 0.09 ± 0.10 ± 0.12 ± 0.070 ± 0.080 ± 0.100 ＞ 1.20 ～ 1.60 ± 0.12 ± 0.13 ± 0.15 ± 0.080 ± 0.100 ± 0.110 ＞ 1.60 ～ 2.00 ± 0.15 ± 0.16 ± 0.18 ± 0.100 ± 0.110 ± 0.130 ＞ 2.00 ～ 2.50 ± 0.18 ± 0.19 ± 0.21 ± 0.120 ± 0.130 ± 0.150 ＞ 2.50 ～ 3.00 ± 0.21 ± 0.22 ± 0.23 ± 0.150 ± 0.160 ± 0.170 ＞ 3.00 ～ 3.50 ± 0.23 ± 0.25 ± 0.25 ± 0.190 ± 0.200 ± 0.200 Table 5 Unit. mm Specified minimum yield strength MPa nominal thickness Thickness tolerance Super advanced thickness accuracy (PT.C) < 260 0.17 ～ ＜ 0.30 ± 0.010 0.30 ～ ＜ 0.60 ± 0.015 0.60 ～ ＜ 0.80 ± 0.020 0.80 ～ ＜ 1.00 ± 0.025 1.00 ～ ＜ 1.40 ± 0.030 1.40 ～ ＜ 2.00 ± 0.040 2.00 ～ ＜ 2.50 ± 0.050 2.50 ～ 3.50 ± 0.060 260 ～ ＜ 360 0.30 ～ ＜ 0.60 ± 0.020 0.60 ～ ＜ 0.80 ± 0.030 0.80 ～ ＜ 1.00 ± 0.035 1.00 ～ ＜ 1.40 ± 0.040 1.40 ～ ＜ 2.50 ± 0.050 2.50 ～ 3.50 ± 0.060 360 ～ 420 0.30 ～ ＜ 0.70 ± 0.030 0.70 ～ ＜ 1.10 ± 0.040 1.10 ～ ＜ 1.60 ± 0.050 1.60 ～ ＜ 2.30 ± 0.060 2.30 ～ 3.50 ± 0.070 ＞ 420 0.50 ～ ＜ 0.70 ± 0.040 0.70 ～ ＜ 1.10 ± 0.050 1.10 ～ ＜ 1.60 ± 0.060 1.60 ～ ＜ 2.30 ± 0.070 2.30 ～ 3.50 ± 0.080 5.2 Width tolerance 5.2.1 For color-coated and aluminized zinc-free steel plates and strips, the allowable deviation in width shall meet the requirements of Table 6. The allowable deviation of the width of the coated steel plate and steel strip shall meet the requirements of Tables 7 and 8. Table 6 Unit. mm Edge state nominal width width allowable deviation (PW.A) Uncut Edge (EM) 600 ～ 1200 0 ～ 5 ＞ 1200 ～ 1500 0 ～ 6 ＞ 1500 0 ～ 7 Table 7 Unit. mm Edge state Nominal width Width Allowable deviation Basic accuracy (PW.W) Normal accuracy (PW.A) Uncut edges (EM) 630 ～ 2080 0 ～ 15 0 ～ 8 Table 8 Unit. mm Edge State Nominal Width Allowed Deviation Edge State Normal Precision (PW.A) Advanced Precision (PW.B) Trim (EC) ≥600 ～ 1200 0 ～ 4 0 ～ 2 ＞ 1200 ～ 1500 0 ～ 5 0 ～ 2 ＞ 1500 ～ 1850 0 ～ 5 0 ～ 3 ＞ 1850 ～ 2040 0 ～ 6 0 ～ 4 5.2.2 The allowable deviation of the width of the slit steel strip shall meet the requirements of Table 9. Table 9 Unit. mm Nominal thickness Width tolerance Normal accuracy (PW.A) Advanced accuracy (PW.B) Nominal width 200 ～ < 900.200 ～ < 250 250 ～ < 400 400 ～ < 600 600 ～ < 900 0.30 ～ < 0.40 0 ～ 3 0 to 0.6 0 to 1.0 0 to 1.5 0 to 2.0 0.40 ～ < 1.00 0 ～ 0.8 0 ～ 1.2 0 ～ 1.5 0 ～ 2.0 1.00 ～ < 1.80 0 ～ 1.0 0 ～ 1.5 0 ～ 2.0 0 ～ 2.5 1.80 ～ < 3.00 0 ～ 1.3 0 ～ 1.7 0 ～ 2.0 0 ～ 2.5 3.00 ～ 3.50 0 ～ 1.5 0 ～ 2.0 0 ～ 2.3 0 ～ 2.5 5.3 Allowable deviation in length The allowable deviation of the length of the steel plate shall meet the requirements of Table 10. Table 10 Unit. mm Nominal length Allowable deviation Normal accuracy (PL.A) Advanced accuracy (PL.B) ≤2000 0 ～ 5 0 ～ 3 ＞.2000 0 ～ 0.0025 × Nominal length 0 ～ 0.0015 × Nominal length

6 Appearance

6.1 Out of Squareness 6.1.1 Steel plates shall be cut at right angles. 6.1.2 The squareness (u) of the steel plate may be measured by the projection method or the diagonal method. When measured by projection, The squareness (u) should not be greater than 1% of the actual width of the steel plate. When measured by the diagonal method, the calculated squareness (u) should not be greater than the actual steel plate 0.7% of width. 6.1.3 In the event of a dispute, arbitration shall be conducted by projection measurement. 6.2 Edge Camber 6.2.1 The sickle curve of steel plate and steel strip refers to the maximum distance between the side and the straight line connecting the two ends of the measurement part. It is concave in the product Measure one side of the shape, as shown in Figure 2. 6.2.2 The sickle bends of steel plates and strips shall not be greater than 4 mm at any.2000 mm length. When the length of the steel plate is not more than.2000mm, its The sickle curve should not be greater than 0.2% of the actual measured length of the steel plate. 6.2.3 The sickle bend of the longitudinally cut steel strip shall not be greater than 2mm at any.2000mm length. 6.3 Flatness 6.3.1 The unevenness of the steel plate refers to the maximum distance between the lower surface of the steel plate and the platform measured when the steel plate is freely placed on the platform. Figure 1 As shown. 6.3.2 According to the shape and location, the strain types of steel plates can be divided into the following categories. 6.3.2.1 Bow. Residual bending (Curving) in all directions of the steel plate, either longitudinal (in the direction of rolling) Crosswise (vertical to the rolling direction). 6.3.2.2 Wave. Waves along the longitudinal direction of the steel plate, rippling. 6.3.2.3 Edge wave. refers to the wave along the edge of the steel plate. 6.3.2.4 Center buckle (centre fullness; full centre). A wave indicating the position of the middle of the steel plate, Also called central fold. 6.3.3 The provisions for unevenness apply only to steel plates. If the steel plate is not leveled, only ordinary unevenness accuracy is applicable. 6.3.4 The unevenness of the steel plate shall comply with the values specified in Table 11. Table 11 Unit. mm Specified minimum yield strength MPa nominal width Unevenness is not greater than Normal accuracy (PF.A) Advanced accuracy (PF.B) Nominal thickness < 0.70 0.70 ～ < 1.20 ≥1.20 ＜ 0.70 0.70 ～ < 1.20 ≥1.20 < 260 < 600 7 6 5 4 3 2 600 ～ ≤1200 8 7 6 5 4 3 ＞ 1200 ～ 1500 10 8 7 6 5 4 ＞ 1500 15 13 11 7 6 5 260 ～ ＜ 360 600 ～ ≤1200 10 8 7 7 6 5 1200 ～ 1500 13 11 9 8 7 6 ＞ 1500 17 15 13 11 10 9 ≥360 600 ～ ≤1200 13 10 8 10 8 7 1200 ～ 1500 16 13 11 12 10 8 ＞ 1500 21 19 17 14 12 10 6.3.5 For the steel plate with a specified minimum yield strength of 260 ～ < 360MPa and ≥360MPa and a width of less than 600mm, supply and demand are doubled. Party agreement is determined. 6.3.6 For steel plates with a specified minimum yield strength of less than 260 MPa, if the user has special requirements for unevenness accuracy, it can also be given according to Table 12. Super-precision ordering. Table 12 Unit. mm Specified minimum yield strength MPa nominal width Unevenness is not greater than Super Advanced Precision (PF.C) Nominal thickness < 0.50 0.5 ～ < 0.70 0.70 ～ < 1.20 ≥1.20 < 260 ≤1200 3 2.5 2 2 ＞ 1200 ～ 1500 3.5 3 2.5 3 ＞ 1500 4 3.5 3 3 6.3.7 If the user has special requirements for the L-warp produced by the roll delivery, it can be negotiated separately. 6.3.8 For steel plates with a specified minimum yield strength of less than 260 MPa, when they are supplied with high-level unevenness accuracy or ultra-high-level unevenness accuracy, In the case of arbitration, Edge waves must be inspected. Edge waves should meet the following requirements.  When the length of the edge wave is not less than.200mm, for a steel plate with a nominal width less than 1500mm, the wave height should be less than the edge wave 1% of the length. When the wave length of the edge is not less than.200mm, for steel plates with a nominal width of not less than 1500mm, the wave height should be Less than 1.5% of the edge wave length.  When the length of the side wave is less than.200mm, the wave height should not be greater than 2mm. 6.3.9 After the user has sufficiently leveled and straightened the steel strip, the specified values of PF.A in Table 11 also apply to steel plates cut by the user from steel strip.

7 Dimension and shape measurement

7.1 The thickness measurement points are any points not less than 25mm (cut edge) or 40mm (non-cut edge) from the edge, if otherwise specified by the product standard Except for. 7.2 Squareness (u) 7.2.1 When measured by projection method, the squareness (u) is the vertical projection length of the wide side (width) of the steel plate to the longitudinal side (length) of the steel plate, as shown in the figure. 2 shown. 7.2.2 When the diagonal method is used for measurement, the two diagonal lengths of the steel plate shall be measured and calculated to obtain 1/2 of the difference between the diagonal lengths, that is, u = | X1-X2 |/2, as shown in Figure 3. 7.3 Edge camber 7.3.1 The measurement position of the sickle bend of the steel belt shall be not less than 5000mm from the head or tail of the steel belt. 7.3.2 For steel plates with a length not greater than.2000 mm, the length of the steel plate is equal to the measured length of the sickle curve; for lengths greater than.2000 mm The steel plate can be measured with a length of.2000mm. 7.4 Unevenness 7.4.1 For a steel plate with a length of not more than.2000mm, the length of the steel plate is the measured length of the unevenness. 7.4.2 For steel plates with a length of more than.2000mm, it is possible to arbitrarily cut the steel plate with a length of.2000mm to measure the unevenness.

8 weight

Steel plates are usually delivered according to the theoretical weight, or they can be delivered according to the actual weight. Steel belt usually Delivery according to actual weight. 9 If the user has other special requirements for size, shape, weight, and allowable deviation, they can be negotiated when ordering and specified in the contract. 10 Numerical rounding rules Numerical rounding rules shall comply with the provisions of GB/T 8170. Note. 1. unevenness Figure 1 Unevenness measurement Note. L. length of steel plate W. steel plate width q. sickle bend u. Fractal Degree Fig. 2 Projection measurement of squareness (u) and measurement of sickle curve Note. X1. diagonal length X2. diagonal length L. length of steel plate W. steel plate width The calculation formula is as follows. u = | X1-X2......
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