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GB/T 709-2019 PDF English

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GB/T 709-2019: Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet
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GB/T 709: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 709-2019English125 Add to Cart 0-9 seconds. Auto-delivery Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet Valid
GB/T 709-2006English70 Add to Cart 0-9 seconds. Auto-delivery [New version GB/T 709-2019] Dimension shape weight and tolerances for hot-rolled steel plates and sheets Obsolete
GB/T 709-1988English359 Add to Cart 3 days Dimensions, shape, weight and tolerances for hot-rolled plates and sheets Obsolete

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GB/T 709-2019: Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet


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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 H 46 Replacing GB/T 709-2006 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet Issued on. MARCH 25, 2019 Implemented on. FEBRUARY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Classification and code... 6 5 Dimensions... 6 6 Dimension tolerances... 7 7 Shape... 13 8 Measurement of dimensions and shape... 17 9 Weight... 20 10 Rounding off of numerical values... 21 Annex A (informative) Thickness tolerance of plates... 22

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 709-2006 “Dimension, shape, weight and tolerances for hot-rolled steel plates and sheets”. Compared with GB/T 709-2006, the main technical changes of this Standard are as follows. - ADD the terms and definitions of “slit wide strip” and “plate/sheet cut from strip” (see 3.3, 3.4); - MODIFY “positive tolerance” to “upper tolerance” and “negative tolerance” to “lower tolerance” (see 4.2 of this Standard, 4.2 of 2006 edition); - ADD the classification and technical requirements of general precision of flatness PF.A and higher precision of flatness PF.B (see 4.4, 7.1.1.2); - MODIFY the dimension range of steel plates/sheets and strips (see Table 1 of this Standard, 5.1 of 2006 edition); - COMBINE the classes N, A, B, and C tolerances of plates INTO one table; ADD the thickness tolerance requirements for thickness greater than 400 mm; ADJUST the upper limit of the nominal width TO 5300 mm (see Table 2 of this Standard, Table 1, Table 2, Table 3, Table 4 of 2006 edition); - ADD the negotiation terms of thickness tolerance for steel plates/sheets with a thickness greater than 200 mm (see 6.1.1.3); - ADD the requirement that it may supply according to the tolerances given in Annex A after agreed upon between the supply and demand parties (see 6.1.1.4); - MODIFY the level classification of the thickness tolerance of steel strips (including plates/sheets cut form strips) according to the specified minimum yield strength less than 345 MPa TO less than 360 MPa; separately SPECIFY the thickness tolerance of those with the minimum yield strength not less than 360 MPa (see Table 3 and Table 4 of this Standard, Table 5 of 2006 edition); - ADD the requirement that steel plates/sheets and strips are supplied according to general precision when the thickness tolerance and flatness are default (see 6.1.2, 7.1.2); - ADD the negotiation terms when the yield strength and requirements are not specified in the thickness tolerance and flatness requirements of steel strips and plate/sheet cut from strip in the product standard (see 6.1.2.3, 7.1.3); - MODIFY the length tolerance of plates (see Table 8 of this Standard, Table 10 of 2006 edition); - MODIFY the length tolerance of plates/sheets cut from strips (see Table 9 of this Standard, Table 11 of 2006 edition); - MODIFY the requirements for the flatness of plates (see 7.1.1 of this Standard, Table 12 of 2006 edition); - MODIFY the requirements for the flatness of plates/sheets cut from strips (see Table 11 of this Standard, Table 13 of 2006 edition); - MODIFY the “cutting angle” to “out-of-squareness”; ADD the method and requirements for the measurement of out-of-squareness using the diagonal method (see 7.3 of this Standard, 7.3 of 2006 edition); - ADD the schematic diagram of the measurement of flatness of plates (see Figure 2); - ADD the schematic diagram of the measurement of out-of-squareness using the diagonal method (see Figure 6); - ADD the weight of a steel plate, when the rounding of more than 1000kg to the integer value of kg is worth stipulated (see Table 14). This Standard was proposed by China Iron and Steel Industry Association. This Standard is under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183). Drafting organizations of this Standard. China Metallurgical Information and Standardization Institute, Liuzhou Iron and Steel Co., Ltd., Hunan Hualing Xiangtan Iron and Steel Co., Ltd., Shougang Group Co., Ltd., Tangshan Ruifeng Iron and Steel (Group) Co., Ltd., Shandong Iron and Steel Group Rizhao Co., Ltd., Baoshan Iron and Steel Co., Ltd. Co., Ltd., Angang Steel Co., Ltd. Main drafters of this Standard. Hou Jie, Zhang Weixu, Li Qian, Luo Jun, Luo Deng, Shi Li, Zhang Liqiang, Sun Weihua, Huang Jinhua, Guan Jichun, Fan Lei, Zhang Yongwei, Feng Bingxiao, Hou Donghua. The previous released versions replaced by this Standard are as follows. - GB 709-1965, GB 709-1988, GB/T 709-2006. Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet

1 Scope

This Standard specifies terms and definitions, classification and code, dimensions, dimension tolerances, shape, measurement of dimensions and shape of hot-rolled steel plates/sheets and strips. This Standard applies to plates with a rolling width of not less than 600 mm (hereinafter referred to plates), wide strips, slit wide strips, and plates/sheets cut from strips.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply. 3.1 plate Hot-rolled flat steel that is directly rolled and does not have fixed edge deformation. Steel strips that are slit from wide strips and delivered in rolls. 3.4 plate/sheet cut from strip Steel plates/sheets that are cut from wide strips or slit wide strips and delivered in plates/sheets.

4 Classification and code

4.1 Classification according to edge state is as follows. 4.2 Classification according to thickness tolerance classes and code are as follows. 4.3 Classification according to precision of thickness and code are as follows. 4.4 Classification according to precision of flatness and code are as follows.

5 Dimensions

5.1 Nominal dimension range The nominal dimension range of steel plates/sheets and strips shall comply with the requirements of Table 1. 5.2 Recommended nominal dimensions 5.2.1 The nominal thickness of plates is within the range specified in Table 1. Steel plates/sheets with a thickness of less than 30 mm shall be of any dimension in multiples of 0.5 mm; steel plates/sheets with a thickness of not less than 30 mm shall be of any dimension in multiples of 1 mm. 5.2.4 The nominal width of steel strips (including plates/sheets cut from strips) is within the range specified in Table 1, in any dimension in multiples of 10 mm. 5.2.5 The length of steel plates/sheets is within the range specified in Table 1, in any dimension in multiples of 50 mm or 100 mm. 5.2.6 As required by the demand party, and agreed upon between the supply and demand parties, steel plates/sheets and strips of other dimensions than the nominal dimension may be supplied.

6 Dimension tolerances

6.1 Thickness tolerance 6.1.1 Thickness tolerance of plates 6.1.2 Thickness tolerance of steel strips (including plates/sheets cut from strips) 6.1.2.1 The thickness tolerance of steel strips (including plates/sheets cut from strips), of which the specified minimum yield strength Re is less than 360 MPa, shall comply with the requirements of Table 3.If the demand party requires supply according to the higher precision of thickness (PT.B), it shall be indicated in the contract. If not indicated, supply according to the general precision of thickness (PT.A). 6.1.2.2 The thickness tolerance of steel strips (including plates/sheets cut from strips), of which the specified minimum yield strength Re is not less than 360 MPa, shall comply with the requirements of Table 4. 6.1.2.3 When the yield strength is not specified in the product standard and the thickness tolerance is not specified, the thickness tolerance of steel strips (including plates/sheets cut from strips) shall be agreed upon between the supply and demand parties and indicated in the contract. 6.2 Width tolerance 6.3 Length tolerance 6.3.1 The length tolerance of plates shall comply with the requirements of Table 8. 6.3.2 The length tolerance of plates/sheets cut from strips shall comply with the requirements of Table 9.

7 Shape

7.1 Flatness 7.1.1 Plates 7.1.1.1 General requirements 7.1.1.2 Technical requirements 7.1.1.2.1 The flatness of plates shall comply with the requirements of Table 10. If the demand party requires supply according to the higher precision of flatness (PF.B), it shall be indicated in the contract. If not indicated, supply according to the general precision of flatness (PF.A). 7.1.2.1 The flatness of plates/sheets cut from strips shall comply with the requirements of Table 11. 7.1.2.2 For plates/sheets cut from strips of which the specified minimum yield strength is not more than 300 MPa, if the demand party requires supply according to the higher precision of flatness (PF.B), it shall be indicated in the contract. If not indicated, supply according to the and the general precision of flatness (PF.A). 7.1.3 Special requirements 7.1.3.1 When the yield strength is not specified in the product standard and the flatness requirements are not specified, the flatness of plates and plates/sheets cut from strips shall be agreed upon between the supply and demand parties and indicated in the contract. 7.1.3.2 If the user has requirements for the flatness of steel strips, on the premise that the user's unwinding equipment can guarantee the quality, it may be agreed upon between the supply and demand parties and indicated in the contract. 7.1.3.3 If the user has requirements for the flatness of steel strips, after the user has fully flattened the steel strips, the values specified in Table 11 are also applicable to the steel plates/sheets cut by the user from the steel strips. 7.2 Camber 7.2.1 The camber of plates shall be such that the plate is cut into a rectangular shape according to the order dimension. The camber of cut-edge plates shall not be greater than 0.2 % of the actual length. 7.2.2 The camber of wide strips (including slit wide strips) and plates/sheets cut from strips shall comply with the requirements of Table 12.When inspecting the camber of mill-edge wide strips without cutting the head and tail, the total length of the two ends that is not assessed is in accordance with the requirements of inspecting the total length of the two ends that is not assessed of the thickness and width of mill-edge steel strips without cutting the head and tail in 8.1. 7.3 Out-of-squareness 7.4 Tower shape Steel strips shall be firmly wound into a roll. The height of the tower shape on one side of the steel strip roll shall not exceed the requirements of Table 13.

8 Measurement of dimensions and shape

8.1 Length that is not assessed When inspecting the thickness and width of mill-edge steel strips without cutting the head and tail, the total length L of the two ends that is not assessed is 90/nominal thickness (L is in mm, the nominal thickness is in mm) and shall be no more than 20 m. 8.2 Thickness For cut-edge steel strips (including plates/sheets cut from strips), it is measured at a distance of not less than 25 mm from the longitudinal side. For mill-edge steel strips (including plates/sheets cut from strips), it is measured at a distance of not less than 40 mm from the longitudinal side. 8.3 Width The width shall be measured at where perpendicular to the centerline of steel plates/sheets or strips. 8.4 Length The length of the largest rectangle in steel plates/sheets. 8.5 Flatness 8.5.1 Place the steel plate/sheet freely on a flat surface without applying any pressure other than the weight of the steel plate/sheet itself. 8.5.3 Measure the maximum distance between the upper surface of the trough of the plate and the ruler, see Figure 2. 8.5.4 Measure the maximum distance between the lower surface of the plate/sheet cut from strip and the platform, see Figure 3. 8.6 Camber Measure the maximum distance between the concave side of the steel plate/sheet or strip and the straight line connecting the two ends of the measuring portion, as shown in Figure 4. 8.7 Out-of-squareness The out-of-squareness of steel plates/sheets is measured in one of following two methods.

9 Weight

9.1 Steel plates/sheets are delivered according to theoretical or actual weight. Steel strips are delivered according to actual weight. 9.2 When steel plates/sheets are delivered according to theoretical weight, the theoretical weight is calculated using nominal dimensions and the carbon steel density of 7.85 kg/dm3.Other steel grades are weighted according to the corresponding standards. 9.3 When the thickness tolerance of steel plates/sheets is limited to negative or positive tolerance, the thickness used for the theoretical weight is the average value of the maximum thickness and the minimum thickness allowed. 9.4 The theoretical weight of steel plates/sheets is calculated according to the calculation method specified in Table 14.

10 Rounding off of numerical values

The measurement results are rounded off according to the rounded off value comparison method. Rules of rounding off are implemented in accordance with the provisions of GB/T 8170. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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