dimensional and shape tolerances HOT-ROLLED STEEL PLATES AND COILS

Transcription

1 dimensional and shape tolerances HOT-ROLLED STEEL PLATES AND COILS

2 Scope The dimensional and shape tolerances of steel are determined by the requirements of the materials standard or the data sheet of the steel grade in question. This technical brochure specifies the dimensional and shape tolerances of Ruukki s steel grades for each product form. The technical brochure applies to steel grades in the hot-rolled, normalized rolled, furnace normalized, thermomechanically rolled, hardened or quenched and tempered condition. Selected tolerance values of Ruukki s special steels are more exact than the tolerances set in standards. So, it is recoended to check the special steels tolerances on the product data on the web Standards and norms The dimensional and shape tolerances of steel grades for each product form are based on the following standards or norms: Heavy plates (plates): EN 129 Cut lengths (sheets), wide coils and slit strips: EN 151 2) Patterned plates: DIN ), SEL 14E:1979 4), SFS 55 5) or ASTM A786 6) If the customer does not specify the tolerance required when making the order, Ruukki applies the tolerances of the appropriate materials standard or this technical brochure. EN 129:21 Hot-rolled steel plates 3 thick or above. Tolerances on dimensions and shape 2) EN 151:21 Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels. Tolerances on dimensions and shape In EN 151, the thickness tolerances are divided according to four different yield strength classes. The four dimensional tolerance categories are A, B, C and D. 1. Dimensional tolerance category A, ReH 3MPa 2. Dimensional tolerance category B, 3 MPa < ReH 36 MPa 3. Dimensional tolerance category C, 36 MPa < ReH 42 MPa 4. Dimensional tolerance category D, 42 MPa < ReH 9 MPa. The lower the strength class is the narrower are the thickness tolerances. The dimensional tolerances of steel grades which do not have a specified minimum yield strength are the ones of category D. For all its cut lengths, coils and slit strips Ruukki uses thickness tolerances according to dimensional tolerance category A of EN 151. The tolerances of category A are the best for the customers, because they are the narrowest ones. 3) DIN 5922:2. Flacherzeugnisse aus Stahl - Warmgewalztes Blech mit Mustern - Masse, Gewichte, Grenzabmasse, Formtoleranzen und Grenzabweichungen der Masse. Flat products of steel - Hot rolled patterned plate - Dimensions, mass, tolerances on dimensions, shape and mass. 4) SEL 14E:1979 (Stahl- Eisen-Lieferbedingungen) Warmbreitband mit Mustern. Masse, Gewichte, zulässige Abweichungen. 5) SFS 55:25 Hot rolled patterned plates. Dimensions and tolerances. 6) ASTM A786:29 Standard Specification for Hot-Rolled Carbon, Low- Alloy, High-Strength Low-Alloy, and Alloy Steel Floor Plates. EN 1111:28 Continuously hot rolled low carbon steel sheet and strip for cold forming. Technical delivery conditions. 2

3 Plates The dimensional and shape tolerances for heavy plates are given in table 1. The tolerances are in compliance with standard EN 129, however, the tolerances for flatness of all the heavy plates manufactured by Ruukki, are stricter than those of standard requirements. Class A thickness tolerances are applied to structural steels and class B thickness tolerances to pressure equipment steels, unless otherwise agreed upon. Table 1. Dimensional and Shape Tolerances. Plates Thickness tolerances Nominal thickness Tolerances for nominal thickness Class A Class B Class C Class D Lower Upper Lower Upper Lower Upper Lower Upper 4.7 (5) (8) (15) (25) (4) (8) (15) Description of the Thickness tolerance Classes according to EN Class A: Both lower and upper tolerance values depend on the plate thickness. - Class B: Lower tolerance is fixed to be = -.3, whereas upper tolerance depends on the thickness. - Class C: Lower tolerance is fixed to be =., whereas upper tolerance depends on the thickness. - Class D: Syetrical tolerances i.e. lower and upper tolerance values are equal. Width tolerances Nominal thickness Tolerances Lower allowance < (15) Upper allowance Length tolerances Nominal length Tolerances Lower allowance Upper allowance < (6) +3 6 (8) +4 8 ( +5 1 (15) Edge camber and out-of-squareness Flatness The edge camber and out-of-squareness of a plate shall be limited so that it shall be possible to inscribe a rectangle of the size of the ordered plate within the delivered flat. The normal tolerance for plate flatness is 6 /m (plate thickness below 4 ) and 5 /m (plate thickness 4 and more). By separate agreement, plates can be delivered with stricter flatness tolerance (special tolerances on flatness, class S EN 129). 3

4 Coils and slit strip The dimensional and shape tolerances for coils and slit strips are given in tables 2 and 3. The tolerances are in compliance with standard EN 151. Coils and slit strip delivered by Ruukki have smaller tolerances than those indicated in the standard. If a delivery of cut lengths with sheared edges is required, the letters GK must be appended to the dimension. Slit strips are always delivered with sheared edges. Table 2. Dimensional and shape tolerances. EN 1111, Hot rolled low carbon steel sheet and strip for cold forming, R eh = MPa. Coils and slit strips Thickness tolerances Tolerances for nominal thickness Nominal thickness Width 12 > > > 18 EN 151 EN 151 EN 151 EN ±.13 ±.14 ±.16 (2.) 2.5 ±.14 ±.16 ±.17 ±.19 (2.5) 3. ±.15 ±.17 ±.18 ±.2 (3.) 4. ±.17 ±.18 ±.2 ±.2 (4.) 5. ±.18 ±.2 ±.21 ±.22 (5.) 6. ±.2 ±.21 ±.22 ±.23 (6.) 8. ±.22 ±.23 ±.23 ±.26 (8.) 11. ±.24 ±.25 ±.25 ±.28 Width tolerances Tolerances for nominal Ruukki EN 151 Mill edges Sheared edges GK Nominal Mill edges Sheared edges GK Nominal 12 > 12 Lower Upper Nominal thickness Lower Upper Lower Upper Lower Upper > > The values given in the table for tolerances on thickness and are not valid for the end sections, of length L. L is derived from the formula L(m) = 9/nominal thickness (); the total length of the two ends but not over 2 m. The tolerances for coils and slit strip with sheared edges are valid for nominal thicknesses 1. For nominal thicknesses > 1, the upper allowance is to be agreed in connection of the order. Ruukki Mill edges Sheared edges GK Flatness Straightness Maximum permissable deviation from a straight line Requirements concerning flatness can be agreed at the time of enquiry and order. 1 /6 m 1 /6 m Requirements concerning flatness can be agreed at the time of enquiry and order. Measurements Measurement of thickness > 4 from edge > 25 from edge Coil telescopy 6 6 Measurement of Width is measured at straight angles to the longitudinal edges of the flat 4

5 Table 3. Dimensional and shape tolerances. All steel grades (except EN 111 and all yield strength classes R eh 9 MPa. Coils and slit strip Thickness tolerances Tolerances for nominal thickness Nominal thickness Width 12 > > > 18 Ruukki EN 151 Ruukki EN 151 Ruukki EN 151 Ruukki EN ±.13 ±.17 ±.14 ±.19 ±.16 ±.21 (2.) 2.5 ±.14 ±.18 ±.16 ±.21 ±.17 ±.23 ±.19 ±.25 (2.5) 3. ±.15 ±.2 ±.16 ±.22 ±.18 ±.24 ±.2 ±.26 (3.) 4. ±.16 ±.22 ±.18 ±.24 ±.2 ±.26 ±.2 ±.27 (4.) 5. ±.18 ±.24 ±.2 ±.26 ±.21 ±.28 ±.22 ±.29 (5.) 6. ±.2 ±.26 ±.21 ±.28 ±.22 ±.29 ±.23 ±.31 (6.) 8. ±.22 ±.29 ±.22 ±.3 ±.23 ±.31 ±.26 ±.35 (8.) 1. ±.24 ±.32 ±.24 ±.33 ±.25 ±.34 ±.3 ±.4 (1.) 12.5 ±.26 ±.35 ±.27 ±.36 ±.28 ±.37 ±.31 ±.43 (12.5) 15. ±.28 ±.37 ±.28 ±.38 ±.3 ±.4 ±.34 ±.46 (15.) 25. ±.3 ±.4 ±.31 ±.42 ±.34 ±.45 ±.37 ±.5 The standard tolerances on thickness are according to the EN 151 Category A (yield strength R eh 3 MPa in the standard). Width tolerances Tolerances for nominal Ruukki EN 151 Mill edges Sheared edges GK Nominal Mill edges Sheared edges GK Nominal 12 > 12 Lower Upper Nominal thickness Lower Upper Lower Upper Lower Upper > > The values given in the table for tolerances on thickness and are not valid for the end sections, of length L. L is derived from the formula L(m) = 9/nominal thickness (); the total length of the two ends but not over 2 m. The tolerances for coils and slit strip with sheared edges are valid for nominal thicknesses 1. For nominal thicknesses > 1, the upper allowance is to be agreed in connection of the order. Ruukki Mill edges Sheared edges GK Flatness Straightness Maximum permissable deviation from a straight line Requirements concerning flatness can be agreed at the time of enquiry and order. 1 /6 m 1 /6 m Requirements concerning flatness can be agreed at the time of enquiry and order. Measurements Measurement of thickness at > 4 from edge at > 25 from edge Coil telescopy 6 6 Measurement of Width is measured at straight angles to the longitudinal edges of the flat 5

6 Cut lengths The dimensional and shape tolerances for cut lengths are given in tables 4 and 5. The tolerances are in compliance with standard EN 151. By separate agreement, cut lengths can be delivered with Ruukki tolerances that are stricter than the standard tolerance values. If a delivery of cut lengths with sheared edges is required, the letters GK must be appended to the dimension. In addition, it is possible to have cut lengths supplied to the length tolerances specified for precision cutting. Table 4. Dimensional and shape tolerances. EN 1111, Hot rolled low carbon steel sheet and strip for cold forming, R eh = MPa. Cut lengths Thickness tolerances. Tolerances for nominal thickness Nominal thickness Width 12 (12)-15 (15)-18 (18) EN 151 EN 151 EN 151 EN ±.13 ±.14 ±.16 (2.) 2.5 ±.14 ±.16 ±.17 ±.19 (2.5) 3. ±.15 ±.17 ±.18 ±.2 (3.) 4. ±.17 ±.18 ±.2 ±.2 (4.) 5. ±.18 ±.2 ±.21 ±.22 (5.) 6. ±.2 ±.21 ±.22 ±.23 (6.) 8. ±.22 ±.23 ±.23 ±.26 (8.) 1. ±.24 ±.25 ±.25 ±.28 Width tolerances. Tolerances for nominal Ruukki EN 151 Nominal Mill edges Sheared edges GK Nominal Mill edges Leikatuin reunoin GK Lower Upper Lower Upper Lower Upper Lower Upper > > > The tolerances for cut lengths with sheared edges are valid for nominal thickness 1. For nominal thickness >1, the upper allowance is subject to agreement in connection with the order. Length tolerances. Tolerances for Ruukki EN 151 Nominal length Normal Precision cut Nominal length Lower Upper Lower Upper Lower Upper < 2 +1 > < 8 +,5 x 8 +4 Ruukki Mill edges Sheared edges Precision cut Flatness Maximum permissible deviation 6 /m 6 /m 6 /m from flatness Straightness Maximum permissable deviation from a straight line,5 % of,2 % of,2 % of Squareness Off-squareness is permissible up to 1 % of nominal Crossmeasure 2) Up to 5 m length, it must be possible to cut a piece of specified size from the flat 1 % of nominal 2) 2) 4 Measurements Measurement of thickness at 4 from edge at 25 from edge at 25 from edge Measurement of Width is measured at straight angles to the longitudinal edges of the flat 6

7 Table 5. Dimensional and shape tolerances. All steel grades (except EN 111 and all yield strength classes R eh 9 MPa. Cut Lengths Thickness tolerances. Tolerances for nominal thickness Nominal thickness Width 12 > > > 18 Ruukki EN 151 Ruukki EN 151 Ruukki EN 151 Ruukki EN ±.13 ±.17 ±.14 ±.19 ±.16 ±.21 (2.) 2.5 ±.14 ±.18 ±.16 ±.21 ±.17 ±.23 ±.19 ±.25 (2.5) 3. ±.15 ±.2 ±.16 ±.22 ±.18 ±.24 ±.2 ±.26 (3.) 4. ±.16 ±.22 ±.18 ±.24 ±.2 ±.26 ±.2 ±.27 (4.) 5. ±.18 ±.24 ±.2 ±.26 ±.21 ±.28 ±.22 ±.29 (5.) 6. ±.2 ±.26 ±.21 ±.28 ±.22 ±.29 ±.23 ±.31 (6.) 8. ±.22 ±.29 ±.22 ±.3 ±.23 ±.31 ±.26 ±.35 (8.) 1. ±.24 ±.32 ±.24 ±.33 ±.25 ±.34 ±.3 ±.4 (1.) 12.5 ±.26 ±.35 ±.27 ±.36 ±.28 ±.37 ±.31 ±.43 (12.5) 15. ±.28 ±.37 ±.28 ±.38 ±.3 ±.4 ±.34 ±.46 (15.) 25. ±.3 ±.4 ±.31 ±.42 ±.34 ±.45 ±.37 ±.5 The standard tolerances on thickness are according to the EN 151 Category A (yield strength R eh 3 MPa in the standard). Width tolerances. Tolerances for nominal Ruukki EN 151 Nominal Mill edges Sheared edges GK Nominal Mill edges Sheared edges GK Lower Upper Lower Upper Lower Upper Lower Upper > > > The tolerances for cut lengths with sheared edges are valid for nominal thickness 1. For nominal thickness >1, the upper allowance is subject to agreement in connection with the order. Length tolerances. Tolerances for Ruukki EN 151 Nominal length Normal Precision cut Nominal length Lower Upper Lower Upper Lower Upper < 2 +1 > < x 8 +4 Ruukki Mill edges Sheared edges Precision cut Flatness Maximum permissible deviation 6 /m 6 /m 6 /m from flatness Straightness Maximum permissable deviation from a straight line.5 % of.2 % of.2 % of Squareness Off-squareness is permissible up to 1 % of nominal Crossmeasure Measurements 2) Up to 5 m length, it must be possible to cut a piece of specified size from the flat 1 % of nominal 2) 2) 4 Measurement of thickness at 4 from edge at 25 from edge at 25 from edge Measurement of Width is measured at straight angles to the longitudinal edges of the flat 7

8 Patterned plates The dimensional and shape tolerances for patterned plates are given in table 6. The reference standards are DIN 5922, SEL 14E:1979, SFS 55 and ASTM A 786. DIN 5922:/SEL 14E:79 (3-1 )/ SFS 55 is printed on the inspection document. Table 6. Dimensional and shape tolerances Patterned plates Thickness tolerances Thickness Upper and lower allowance for each thickness range Upper Lower Upper Lower Upper Lower Upper Lower Thickness is measured a minimum of 25 from edges for basic plate products. Width tolerances Lower allowance Upper allowance Upper allowance ± +2, patterned plates with sheared edges. +2, patterned plates with mill edges. Length tolerances Length Upper allowance Lower tolerance = ±, patterned plates, sheared and mill edges. Flatness tolerances Thickness Tolerance,, different gauge lengths Gauge length 1 m Gauge length 2 m Permitted deviation from flatness for a gauge length of.31. m is 1% from the gauge length. Flatness is measured from the middle of the plate a minimum of 25 from the edges and 2 from the ends of the patterned plate. The edge camber and out-ofsquareness It must be possible to cut a rectangular piece of the ordered size from the patterned plate. It can be separate agreed upon in conjunction with the order that the edge may only deviate from a straight line a maximum of.2% of the plate length and that the plate end inclination is a maximum of 1 % of the plate. Further information The following technical brochures are related to the subject: Plate products, production prograe; Coil products, production prograe; Patterned plates; Precision cut lengths and precision cut plates with bevelled edge. 8

9 Ruukki provides its customers with energy-efficient steel solutions for better living, working and moving. MFI.2EN/8.213/AN This publication is accurate to the best of our knowledge and understanding. Although every effort has been made to ensure accuracy, the company does not assume any responsibility for any errors or omissions, or any direct, indirect or consequential damage caused by incorrect application of the information. We reserve the right to make changes. Always use original standards for accurate comparison. Ruukki Metals Oy, Suolakivenkatu 1, FI-81 Helsinki, Finland, , Copyright 213 Rautaruukki Corporation. All rights reserved. Ruukki, Rautaruukki, Living. Working. Moving. and Ruukki s product names are trademarks or registered trademarks of Rautaruukki Corporation.