ASTM A1030:16 pdf download

ASTM A1030:16 pdf download.Standard Practice for Measuring Flatness Characteristics of Steel Sheet Products.
6. Procedure
6.1 Wave Edge (see Fig. 3):
6.1.1 Definition—A series of rolling direction edge deviations or undulations of the sheet from a recognized flat surface, having a height (H) and a measurable cycle length (L).
6.1.2 Measuring Methods:
6. 1 .2. 1 With a cut sheet sample, or sheet area still attached to a coil, of at least 4 ft [1.2 m] in length by coil width on a recognized flat surface, measure the height (H) at the peak point of each wave from the recognized flat surface with a ruler, tape measure, tapered gauge. or stepblock gauge. Also measure the cycle length (L) from peak to peak of each wave with a ruler or tape measure.
6. 1 .3 Permissible Variations
6.1.3.1 The height (H) of the highest peak measured in accordance with 6.1.2.1 shaLl comply with applicable limits, such as found in the tables on flatness tolerances of Specifications A568/A568M or A9241A924M. Note that the referenced tables apply to cut sheet that has received adequate flattening. While wavy edge height evident in a sheet area still attached to a coil is a reasonable indication of flatness, it is not bound by the limits of the referenced tables.
6.1.3.2 As stated in the section on flatness tolerances of Specifications A568/A568M or A924/A924M, 1-Unit and % Steepness rejection limits are subject to agreement between producer and purchaser. Using the procedures of Appendix X 1, and the readings from 6.1.2.1, determine the 1-Unit and % Steepness values, first using the distance between the two highest peaks, and second using the distance between two adjacent peaks. The highest I-Unit and % Steepness values obtained from these two situations shall be used to determine if the specification has been met.
6.1.3.3 If the 1-Unit and % Steepness values arc supplied directly using a shape gauge: determine if the results are within the maximum specified values.
6.2 Ridge Buckle, Quarter Buckle, Center Buckle (see Fig.4)
6.2.3.1 The height (H) of the highest peak measured inaccordance with 6.2.2.1 or 6.2.2.2 shall comply with applicablelimits，such as found in the tables on flatness tolerances ofSpecifications A568/A568M or A924/A924M. Note that thereferenced tables apply to cut sheet that has received adequateflattening. While buckle height evident in a sheet area stillattached to a coil is a reasonable indication of flatness, it is notbound by the limits of the referenced tables.
6.2.3.2 As stated in the section on flatness tolerances ofSpecifications A568/A568M or A924/A924M，I-Unit and Steepness rejection limits are subject to agreement betweenproducer and purchaser.Using the procedures of Appendix X1,and the readings from 6.2.2.1 or 6.2.2.2,determine the I-Unitand % Steepness values， first using the distance between thetwo highest peaks, and second using the distance between twoadjacent peaks.The highest I-Unit and Steepness valuesobtained from these two situations shall be used to determineif the specification has been met.